fix

Co-authored-by: Denis Nazarov <denis.nazarov@gmail.com>

Cargo.toml

@@ -11,6 +11,8 @@ members = [
   # integrations
   "integrations/actix",
   "integrations/axum",
+  "integrations/viz",
+  "integrations/utils",
 
   # libraries
   "meta",
@@ -19,17 +21,18 @@ members = [
 exclude = ["benchmarks", "examples"]
 
 [workspace.package]
-version = "0.2.0-alpha"
+version = "0.2.0"
 
 [workspace.dependencies]
-leptos = { path = "./leptos", default-features = false, version = "0.2.0-alpha" }
-leptos_dom = { path = "./leptos_dom", default-features = false, version = "0.2.0-alpha" }
-leptos_macro = { path = "./leptos_macro", default-features = false, version = "0.2.0-alpha" }
-leptos_reactive = { path = "./leptos_reactive", default-features = false, version = "0.2.0-alpha" }
-leptos_server = { path = "./leptos_server", default-features = false, version = "0.2.0-alpha" }
-leptos_config = { path = "./leptos_config", default-features = false, version = "0.2.0-alpha" }
-leptos_router = { path = "./router", version = "0.2.0-alpha" }
-leptos_meta = { path = "./meta", default-feature = false, version = "0.2.0-alpha" }
+leptos = { path = "./leptos", default-features = false, version = "0.2.0" }
+leptos_dom = { path = "./leptos_dom", default-features = false, version = "0.2.0" }
+leptos_macro = { path = "./leptos_macro", default-features = false, version = "0.2.0" }
+leptos_reactive = { path = "./leptos_reactive", default-features = false, version = "0.2.0" }
+leptos_server = { path = "./leptos_server", default-features = false, version = "0.2.0" }
+leptos_config = { path = "./leptos_config", default-features = false, version = "0.2.0" }
+leptos_router = { path = "./router", version = "0.2.0" }
+leptos_meta = { path = "./meta", default-feature = false, version = "0.2.0" }
+leptos_integration_utils = { path = "./integrations/utils", version = "0.2.0" }
 
 [profile.release]
 codegen-units = 1

Makefile.toml

@@ -40,6 +40,7 @@ dependencies = [
 	{ name = "check", path = "examples/tailwind" },
 	{ name = "check", path = "examples/todo_app_sqlite" },
 	{ name = "check", path = "examples/todo_app_sqlite_axum" },
+	{ name = "check", path = "examples/todo_app_sqlite_viz" },
 	{ name = "check", path = "examples/todomvc" },
 ]
 

README.md

@@ -99,6 +99,10 @@ Open browser on [http://localhost:3000/](http://localhost:3000/)
 
 ## FAQs
 
+### What’s up with the name?
+
+*Leptos* (λεπτός) is an ancient Greek word meaning “thin, light, refine, fine-grained.” To me, a classicist and not a dog owner, it evokes the lightweight reactive system that powers the framework. I've since learned the same word is at the root of the medical term “leptospirosis,” a blood infection that affects humans and animals... My bad. No dogs were harmed in the creation of this framework.
+
 ### Is it production ready?
 
 People usually mean one of three things by this question.

docs/book/src/SUMMARY.md

@@ -14,11 +14,11 @@
   - [Passing Children to Components](./view/09_component_children.md)
 - [Interlude: Reactivity and Functions](./interlude_functions.md)
 - [Testing](./testing.md)
-- [Interlude: Styling — CSS, Tailwind, Style.rs, and more]()
-- [Async]()
-  - [Resource]()
-  - [Suspense]()
+- [Async](./async/README.md)
+  - [Loading Data with Resources](./async/10_resources.md)
+  - [Suspense](./async/11_suspense.md)
   - [Transition]()
+- [Interlude: Styling — CSS, Tailwind, Style.rs, and more]()
 - [State Management]()
 - [Interlude: Advanced Reactivity]()
 - [Router]()

docs/book/src/async/10_resources.md

@@ -0,0 +1,53 @@
+# Loading Data with Resources
+
+A [Resource](https://docs.rs/leptos/latest/leptos/struct.Resource.html) is a reactive data structure that reflects the current state of an asynchronous task, allowing you to integrate asynchronous `Future`s into the synchronous reactive system. Rather than waiting for its data to load with `.await`, you transform the `Future` into a signal that returns `Some(T)` if it has resolved, and `None` if it’s still pending.
+
+You do this by using the [`create_resource`](https://docs.rs/leptos/latest/leptos/fn.create_resource.html) function. This takes two arguments (other than the ubiquitous `cx`):
+
+1. a source signal, which will generate a new `Future` whenever it changes
+2. a fetcher function, which takes the data from that signal and returns a `Future`
+
+Here’s an example
+
+```rust
+// our source signal: some synchronous, local state
+let (count, set_count) = create_signal(cx, 0);
+
+// our resource
+let async_data = create_resource(cx,
+	count,
+	// every time `count` changes, this will run
+	|value| async move {
+		log!("loading data from API");
+		load_data(value).await
+	},
+);
+```
+
+To create a resource that simply runs once, you can pass a non-reactive, empty source signal:
+
+```rust
+let once = create_resource(cx, || (), |_| async move { load_data().await });
+```
+
+To access the value you can use `.read(cx)` or `.with(cx, |data| /* */)`. These work just like `.get()` and `.with()` on a signal—`read` clones the value and returns it, `with` applies a closure to it—but with two differences
+
+1. For any `Resource<_, T>`, they always return `Option<T>`, not `T`: because it’s always possible that your resource is still loading.
+2. They take a `Scope` argument. You’ll see why in the next chapter, on `<Suspense/>`.
+
+So, you can show the current state of a resource in your view:
+
+```rust
+let once = create_resource(cx, || (), |_| async move { load_data().await });
+view! { cx,
+	<h1>"My Data"</h1>
+	{move || match once.read(cx) {
+		None => view! { cx, <p>"Loading..."</p> }.into_view(cx),
+		Some(data) => view! { cx, <ShowData data/> }.into_view(cx)
+	}}
+}
+```
+
+Resources also provide a `refetch()` method that allow you to manually reload the data (for example, in response to a button click) and a `loading()` method that returns a `ReadSignal<bool>` indicating whether the resource is currently loading or not.
+
+<iframe src="https://codesandbox.io/p/sandbox/10-async-resources-4z0qt3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px"></iframe>

docs/book/src/async/11_suspense.md

@@ -0,0 +1,72 @@
+# `<Suspense/>`
+
+In the previous chapter, we showed how you can create a simple loading screen to show some fallback while a resource is loading.
+
+```rust
+let (count, set_count) = create_signal(cx, 0);
+let a = create_resource(cx, count, |count| async move { load_a(count).await });
+
+view! { cx,
+	<h1>"My Data"</h1>
+	{move || match once.read(cx) {
+		None => view! { cx, <p>"Loading..."</p> }.into_view(cx),
+		Some(data) => view! { cx, <ShowData data/> }.into_view(cx)
+	}}
+}
+```
+
+But what if we have two resources, and want to wait for both of them?
+
+```rust
+let (count, set_count) = create_signal(cx, 0);
+let (count2, set_count2) = create_signal(cx, 0);
+let a = create_resource(cx, count, |count| async move { load_a(count).await });
+let b = create_resource(cx, count2, |count| async move { load_b(count).await });
+
+view! { cx,
+	<h1>"My Data"</h1>
+	{move || match (a.read(cx), b.read(cx)) {
+		_ => view! { cx, <p>"Loading..."</p> }.into_view(cx),
+		(Some(a), Some(b)) => view! { cx,
+			<ShowA a/>
+			<ShowA b/>
+		}.into_view(cx)
+	}}
+}
+```
+
+That’s not _so_ bad, but it’s kind of annoying. What if we could invert the flow of control?
+
+The [`<Suspense/>`](https://docs.rs/leptos/latest/leptos/fn.Suspense.html) component lets us do exactly that. You give it a `fallback` prop and children, one or more of which usually involves reading from a resource. Reading from a resource “under” a `<Suspense/>` (i.e., in one of its children) registers that resource with the `<Suspense/>`. If it’s still waiting for resources to load, it shows the `fallback`. When they’ve all loaded, it shows the children.
+
+```rust
+let (count, set_count) = create_signal(cx, 0);
+let (count2, set_count2) = create_signal(cx, 0);
+let a = create_resource(cx, count, |count| async move { load_a(count).await });
+let b = create_resource(cx, count2, |count| async move { load_b(count).await });
+
+view! { cx,
+	<h1>"My Data"</h1>
+	<Suspense
+		fallback=move || view! { cx, <p>"Loading..."</p> }
+	>
+		<h2>"My Data"</h2>
+		<h3>"A"</h3>
+		{move || {
+			a.read(cx)
+				.map(|a| view! { cx, <ShowA a/> })
+		}}
+		<h3>"B"</h3>
+		{move || {
+			b.read(cx)
+				.map(|b| view! { cx, <ShowB b/> })
+		}}
+	</Suspense>
+}
+```
+
+Every time one of the resources is reloading, the `"Loading..."` fallback will show again.
+
+This inversion of the flow of control makes it easier to add or remove individual resources, as you don’t need to handle the matching yourself. It also unlocks some massive performance improvements during server-side rendering, which we’ll talk about during a later chapter.
+
+<iframe src="https://codesandbox.io/p/sandbox/10-async-resources-4z0qt3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px"></iframe>

docs/book/src/async/12_transition.md

@@ -0,0 +1,9 @@
+# `<Transition/>`
+
+You’ll notice in the `<Suspense/>` example that if you keep reloading the data, it keeps flickering back to `"Loading..."`. Sometimes this is fine. For other times, there’s [`<Transition/>`](https://docs.rs/leptos/latest/leptos/fn.Suspense.html).
+
+`<Transition/>` behaves exactly the same as `<Suspense/>`, but instead of falling back every time, it only shows the fallback the first time. On all subsequent loads, it continues showing the old data until the new data are ready. This can be really handy to prevent the flickering effect, and to allow users to continue interacting with your application.
+
+This example shows how you can create a simple tabbed contact list with `<Transition/>`. When you select a new tab, it continues showing the current contact until the new data laods. This can be a much better user experience than constantly falling back to a loading message.
+
+<iframe src="https://codesandbox.io/p/sandbox/12-transition-sn38sd?selection=%5B%7B%22endColumn%22%3A15%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A15%2C%22startLineNumber%22%3A2%7D%5D&file=%2Fsrc%2Fmain.rs" width="100%" height="1000px"></iframe>

docs/book/src/async/README.md

@@ -0,0 +1,9 @@
+# Working with `async`
+
+So far we’ve only been working with synchronous users interfaces: You provide some input,
+the app immediately process it and updates the interface. This is great, but is a tiny
+subset of what web applications do. In particular, most web apps have to deal with some kind
+of asynchronous data loading, usually loading something from an API.
+
+Asynchronous data is notoriously hard to integrate with the synchronous parts of your code.
+In this chapter, we’ll see how Leptos helps smooth out that process for you.

docs/book/src/view/09_component_children.md

@@ -122,3 +122,5 @@ view! { cx,
 	</WrappedChildren>
 }
 ```
+
+<iframe src="https://codesandbox.io/p/sandbox/9-component-children-2wrdfd?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A12%2C%22endLineNumber%22%3A19%2C%22startColumn%22%3A12%2C%22startLineNumber%22%3A19%7D%5D" width="100%" height="1000px"></iframe>

examples/counter_isomorphic/src/counters.rs

@@ -97,10 +97,10 @@ pub fn Counter(cx: Scope) -> impl IntoView {
         |_| get_server_count(),
     );
 
-    let value = move || counter.read().map(|count| count.unwrap_or(0)).unwrap_or(0);
+    let value = move || counter.read(cx).map(|count| count.unwrap_or(0)).unwrap_or(0);
     let error_msg = move || {
         counter
-            .read()
+            .read(cx)
             .map(|res| match res {
                 Ok(_) => None,
                 Err(e) => Some(e),
@@ -143,7 +143,7 @@ pub fn FormCounter(cx: Scope) -> impl IntoView {
     let value = move || {
         log::debug!("FormCounter looking for value");
         counter
-            .read()
+            .read(cx)
             .map(|n| n.ok())
             .flatten()
             .map(|n| n)

examples/fetch/src/lib.rs

@@ -60,7 +60,7 @@ pub fn fetch_example(cx: Scope) -> impl IntoView {
     // and by using the ErrorBoundary fallback to catch Err(_)
     // so we'll just implement our happy path and let the framework handle the rest
     let cats_view = move || {
-        cats.with(|data| {
+        cats.with(cx, |data| {
             data.iter()
                 .flatten()
                 .map(|cat| view! { cx, <img src={cat}/> })

examples/hackernews/src/routes/stories.rs

@@ -38,7 +38,7 @@ pub fn Stories(cx: Scope) -> impl IntoView {
     let (pending, set_pending) = create_signal(cx, false);
 
     let hide_more_link =
-        move || pending() || stories.read().unwrap_or(None).unwrap_or_default().len() < 28;
+        move || pending() || stories.read(cx).unwrap_or(None).unwrap_or_default().len() < 28;
 
     view! {
         cx,
@@ -82,7 +82,7 @@ pub fn Stories(cx: Scope) -> impl IntoView {
                         fallback=move || view! { cx,  <p>"Loading..."</p> }
                         set_pending=set_pending.into()
                     >
-                        {move || match stories.read() {
+                        {move || match stories.read(cx) {
                             None => None,
                             Some(None) => Some(view! { cx,  <p>"Error loading stories."</p> }.into_any()),
                             Some(Some(stories)) => {

examples/hackernews/src/routes/story.rs

@@ -17,13 +17,13 @@ pub fn Story(cx: Scope) -> impl IntoView {
             }
         },
     );
-    let meta_description = move || story.read().and_then(|story| story.map(|story| story.title)).unwrap_or_else(|| "Loading story...".to_string());
+    let meta_description = move || story.read(cx).and_then(|story| story.map(|story| story.title)).unwrap_or_else(|| "Loading story...".to_string());
 
     view! { cx,
         <>
             <Meta name="description" content=meta_description/>
                 <Suspense fallback=|| view! { cx, "Loading..." }>
-                    {move || story.read().map(|story| match story {
+                    {move || story.read(cx).map(|story| match story {
                         None => view! { cx,  <div class="item-view">"Error loading this story."</div> },
                         Some(story) => view! { cx,
                             <div class="item-view">

examples/hackernews/src/routes/users.rs

@@ -19,7 +19,7 @@ pub fn User(cx: Scope) -> impl IntoView {
     view! { cx,
         <div class="user-view">
             <Suspense fallback=|| view! { cx, "Loading..." }>
-                {move || user.read().map(|user| match user {
+                {move || user.read(cx).map(|user| match user {
                     None => view! { cx,  <h1>"User not found."</h1> }.into_any(),
                     Some(user) => view! { cx,
                         <div>

examples/hackernews_axum/index.html

@@ -2,7 +2,7 @@
 <html>
 	<head>
 		<link data-trunk rel="rust" data-wasm-opt="z"/>
-		<link data-trunk rel="css" href="./static/style.css"/>
+		<link data-trunk rel="css" href="/style.css"/>
 	</head>
 	<body></body>
 </html>

examples/hackernews_axum/src/error_template.rs

@@ -1,4 +1,7 @@
-use leptos::{view, Errors, For, ForProps, IntoView, RwSignal, Scope, View};
+use leptos::{
+    signal_prelude::*, view, Errors, For, ForProps, IntoView, RwSignal, Scope,
+    View,
+};
 
 // A basic function to display errors served by the error boundaries. Feel free to do more complicated things
 // here than just displaying them
@@ -6,21 +9,22 @@ pub fn error_template(cx: Scope, errors: Option<RwSignal<Errors>>) -> View {
     let Some(errors) = errors else {
         panic!("No Errors found and we expected errors!");
     };
+
     view! {cx,
-    <h1>"Errors"</h1>
-    <For
-        // a function that returns the items we're iterating over; a signal is fine
-        each=errors
-        // a unique key for each item as a reference
-        key=|(key, _)| key.clone()
-        // renders each item to a view
-        view= move |cx, (_, error)| {
-        let error_string = error.to_string();
-          view! {
-            cx,
-            <p>"Error: " {error_string}</p>
+      <h1>"Errors"</h1>
+      <For
+          // a function that returns the items we're iterating over; a signal is fine
+          each=errors
+          // a unique key for each item as a reference
+          key=|(key, _)| key.clone()
+          // renders each item to a view
+          view= move |cx, (_, error)| {
+          let error_string = error.to_string();
+            view! {
+              cx,
+              <p>"Error: " {error_string}</p>
+            }
           }
-        }
       />
     }
     .into_view(cx)

examples/hackernews_axum/src/routes/stories.rs

@@ -38,7 +38,7 @@ pub fn Stories(cx: Scope) -> impl IntoView {
     let (pending, set_pending) = create_signal(cx, false);
 
     let hide_more_link =
-        move || pending() || stories.read().unwrap_or(None).unwrap_or_default().len() < 28;
+        move || pending() || stories.read(cx).unwrap_or(None).unwrap_or_default().len() < 28;
 
     view! {
         cx,
@@ -82,7 +82,7 @@ pub fn Stories(cx: Scope) -> impl IntoView {
                         fallback=move || view! { cx,  <p>"Loading..."</p> }
                         set_pending=set_pending.into()
                     >
-                        {move || match stories.read() {
+                        {move || match stories.read(cx) {
                             None => None,
                             Some(None) => Some(view! { cx,  <p>"Error loading stories."</p> }.into_any()),
                             Some(Some(stories)) => {

examples/hackernews_axum/src/routes/story.rs

@@ -17,13 +17,13 @@ pub fn Story(cx: Scope) -> impl IntoView {
             }
         },
     );
-    let meta_description = move || story.read().and_then(|story| story.map(|story| story.title)).unwrap_or_else(|| "Loading story...".to_string());
+    let meta_description = move || story.read(cx).and_then(|story| story.map(|story| story.title)).unwrap_or_else(|| "Loading story...".to_string());
 
     view! { cx,
         <>
             <Meta name="description" content=meta_description/>
                 <Suspense fallback=|| view! { cx, "Loading..." }>
-                    {move || story.read().map(|story| match story {
+                    {move || story.read(cx).map(|story| match story {
                         None => view! { cx,  <div class="item-view">"Error loading this story."</div> },
                         Some(story) => view! { cx,
                             <div class="item-view">

examples/hackernews_axum/src/routes/users.rs

@@ -19,7 +19,7 @@ pub fn User(cx: Scope) -> impl IntoView {
     view! { cx,
         <div class="user-view">
             <Suspense fallback=|| view! { cx, "Loading..." }>
-                {move || user.read().map(|user| match user {
+                {move || user.read(cx).map(|user| match user {
                     None => view! { cx,  <h1>"User not found."</h1> }.into_any(),
                     Some(user) => view! { cx,
                         <div>

examples/login_with_token_csr_only/Cargo.toml

@@ -0,0 +1,7 @@
+[workspace]
+members = ["client", "api-boundary", "server"]
+
+[patch.crates-io]
+leptos = { path = "../../leptos" }
+leptos_router = { path = "../../router" }
+api-boundary = { path = "api-boundary" }

examples/login_with_token_csr_only/README.md

@@ -0,0 +1,23 @@
+# Leptos Login Example
+
+This example demonstrates a scenario of a client-side rendered application
+that uses uses an existing API that you cannot or do not want to change.
+The authentications of this example are done using an API token.
+
+## Run
+
+First start the example server:
+
+```
+cd server/ && cargo run
+```
+
+then use [`trunk`](https://trunkrs.dev) to serve the SPA:
+
+```
+cd client/ && trunk serve
+```
+
+finally you can visit the web application at `http://localhost:8080`
+
+The `api-boundary` crate contains data structures that are used by the server and the client.

examples/login_with_token_csr_only/api-boundary/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "api-boundary"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }

examples/login_with_token_csr_only/api-boundary/src/lib.rs

@@ -0,0 +1,22 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+pub struct Credentials {
+    pub email: String,
+    pub password: String,
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct UserInfo {
+    pub email: String,
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct ApiToken {
+    pub token: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Error {
+    pub message: String,
+}

examples/login_with_token_csr_only/client/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "client"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+api-boundary = "*"
+
+leptos = { version = "0.2.0-alpha2", features = ["stable"] }
+leptos_router = { version = "0.2.0-alpha2", features = ["stable", "csr"] }
+
+log = "0.4"
+console_error_panic_hook = "0.1"
+console_log = "0.2"
+gloo-net = "0.2"
+gloo-storage = "0.2"
+serde = "1.0"
+thiserror = "1.0"

examples/login_with_token_csr_only/client/Trunk.toml

@@ -0,0 +1,3 @@
+[[proxy]]
+rewrite = "/api/"
+backend = "http://0.0.0.0:3000/"

examples/login_with_token_csr_only/client/index.html

@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<link data-trunk rel="rust" data-wasm-opt="z" data-weak-refs/>
+	</head>
+	<body></body>
+</html>

examples/login_with_token_csr_only/client/src/api.rs

@@ -0,0 +1,94 @@
+use gloo_net::http::{Request, Response};
+use serde::de::DeserializeOwned;
+use thiserror::Error;
+
+use api_boundary::*;
+
+#[derive(Clone, Copy)]
+pub struct UnauthorizedApi {
+    url: &'static str,
+}
+
+#[derive(Clone)]
+pub struct AuthorizedApi {
+    url: &'static str,
+    token: ApiToken,
+}
+
+impl UnauthorizedApi {
+    pub const fn new(url: &'static str) -> Self {
+        Self { url }
+    }
+    pub async fn register(&self, credentials: &Credentials) -> Result<()> {
+        let url = format!("{}/users", self.url);
+        let response = Request::post(&url).json(credentials)?.send().await?;
+        into_json(response).await
+    }
+    pub async fn login(
+        &self,
+        credentials: &Credentials,
+    ) -> Result<AuthorizedApi> {
+        let url = format!("{}/login", self.url);
+        let response = Request::post(&url).json(credentials)?.send().await?;
+        let token = into_json(response).await?;
+        Ok(AuthorizedApi::new(self.url, token))
+    }
+}
+
+impl AuthorizedApi {
+    pub const fn new(url: &'static str, token: ApiToken) -> Self {
+        Self { url, token }
+    }
+    fn auth_header_value(&self) -> String {
+        format!("Bearer {}", self.token.token)
+    }
+    async fn send<T>(&self, req: Request) -> Result<T>
+    where
+        T: DeserializeOwned,
+    {
+        let response = req
+            .header("Authorization", &self.auth_header_value())
+            .send()
+            .await?;
+        into_json(response).await
+    }
+    pub async fn logout(&self) -> Result<()> {
+        let url = format!("{}/logout", self.url);
+        self.send(Request::post(&url)).await
+    }
+    pub async fn user_info(&self) -> Result<UserInfo> {
+        let url = format!("{}/users", self.url);
+        self.send(Request::get(&url)).await
+    }
+    pub fn token(&self) -> &ApiToken {
+        &self.token
+    }
+}
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error(transparent)]
+    Fetch(#[from] gloo_net::Error),
+    #[error("{0:?}")]
+    Api(api_boundary::Error),
+}
+
+impl From<api_boundary::Error> for Error {
+    fn from(e: api_boundary::Error) -> Self {
+        Self::Api(e)
+    }
+}
+
+async fn into_json<T>(response: Response) -> Result<T>
+where
+    T: DeserializeOwned,
+{
+    // ensure we've got 2xx status
+    if response.ok() {
+        Ok(response.json().await?)
+    } else {
+        Err(response.json::<api_boundary::Error>().await?.into())
+    }
+}

examples/login_with_token_csr_only/client/src/components/credentials.rs

@@ -0,0 +1,73 @@
+use leptos::{ev, *};
+
+#[component]
+pub fn CredentialsForm(
+    cx: Scope,
+    title: &'static str,
+    action_label: &'static str,
+    action: Action<(String, String), ()>,
+    error: Signal<Option<String>>,
+    disabled: Signal<bool>,
+) -> impl IntoView {
+    let (password, set_password) = create_signal(cx, String::new());
+    let (email, set_email) = create_signal(cx, String::new());
+
+    let dispatch_action =
+        move || action.dispatch((email.get(), password.get()));
+
+    let button_is_disabled = Signal::derive(cx, move || {
+        disabled.get() || password.get().is_empty() || email.get().is_empty()
+    });
+
+    view! { cx,
+      <form on:submit=|ev|ev.prevent_default()>
+        <p>{ title }</p>
+        {move || error.get().map(|err| view!{ cx,
+          <p style ="color:red;" >{ err }</p>
+        })}
+        <input
+          type = "email"
+          required
+          placeholder = "Email address"
+          prop:disabled = move || disabled.get()
+          on:keyup = move |ev: ev::KeyboardEvent| {
+            let val = event_target_value(&ev);
+            set_email.update(|v|*v = val);
+          }
+          // The `change` event fires when the browser fills the form automatically,
+          on:change = move |ev| {
+            let val = event_target_value(&ev);
+            set_email.update(|v|*v = val);
+          }
+        />
+        <input
+          type = "password"
+          required
+          placeholder = "Password"
+          prop:disabled = move || disabled.get()
+          on:keyup = move |ev: ev::KeyboardEvent| {
+            match &*ev.key() {
+                "Enter" => {
+                   dispatch_action();
+                }
+                _=> {
+                   let val = event_target_value(&ev);
+                   set_password.update(|p|*p = val);
+                }
+            }
+          }
+          // The `change` event fires when the browser fills the form automatically,
+          on:change = move |ev| {
+            let val = event_target_value(&ev);
+            set_password.update(|p|*p = val);
+          }
+        />
+        <button
+          prop:disabled = move || button_is_disabled.get()
+          on:click = move |_| dispatch_action()
+        >
+        { action_label }
+        </button>
+      </form>
+    }
+}

examples/login_with_token_csr_only/client/src/components/mod.rs

@@ -0,0 +1,4 @@
+pub mod credentials;
+pub mod navbar;
+
+pub use self::{credentials::*, navbar::*};

examples/login_with_token_csr_only/client/src/components/navbar.rs

@@ -0,0 +1,32 @@
+use leptos::*;
+use leptos_router::*;
+
+use crate::Page;
+
+#[component]
+pub fn NavBar<F>(
+    cx: Scope,
+    logged_in: Signal<bool>,
+    on_logout: F,
+) -> impl IntoView
+where
+    F: Fn() + 'static + Clone,
+{
+    view! { cx,
+      <nav>
+        <Show
+          when = move || logged_in.get()
+          fallback = |cx| view! { cx,
+            <A href=Page::Login.path() >"Login"</A>
+            " | "
+            <A href=Page::Register.path() >"Register"</A>
+          }
+        >
+          <a href="#" on:click={
+            let on_logout = on_logout.clone();
+            move |_| on_logout()
+          }>"Logout"</a>
+        </Show>
+      </nav>
+    }
+}

examples/login_with_token_csr_only/client/src/lib.rs

@@ -0,0 +1,130 @@
+use gloo_storage::{LocalStorage, Storage};
+use leptos::*;
+use leptos_router::*;
+
+use api_boundary::*;
+
+mod api;
+mod components;
+mod pages;
+
+use self::{components::*, pages::*};
+
+const DEFAULT_API_URL: &str = "/api";
+const API_TOKEN_STORAGE_KEY: &str = "api-token";
+
+#[component]
+pub fn App(cx: Scope) -> impl IntoView {
+    // -- signals -- //
+
+    let authorized_api = create_rw_signal(cx, None::<api::AuthorizedApi>);
+    let user_info = create_rw_signal(cx, None::<UserInfo>);
+    let logged_in = Signal::derive(cx, move || authorized_api.get().is_some());
+
+    // -- actions -- //
+
+    let fetch_user_info = create_action(cx, move |_| async move {
+        match authorized_api.get() {
+            Some(api) => match api.user_info().await {
+                Ok(info) => {
+                    user_info.update(|i| *i = Some(info));
+                }
+                Err(err) => {
+                    log::error!("Unable to fetch user info: {err}")
+                }
+            },
+            None => {
+                log::error!("Unable to fetch user info: not logged in")
+            }
+        }
+    });
+
+    let logout = create_action(cx, move |_| async move {
+        match authorized_api.get() {
+            Some(api) => match api.logout().await {
+                Ok(_) => {
+                    authorized_api.update(|a| *a = None);
+                    user_info.update(|i| *i = None);
+                }
+                Err(err) => {
+                    log::error!("Unable to logout: {err}")
+                }
+            },
+            None => {
+                log::error!("Unable to logout user: not logged in")
+            }
+        }
+    });
+
+    // -- callbacks -- //
+
+    let on_logout = move || {
+        logout.dispatch(());
+    };
+
+    // -- init API -- //
+
+    let unauthorized_api = api::UnauthorizedApi::new(DEFAULT_API_URL);
+    if let Ok(token) = LocalStorage::get(API_TOKEN_STORAGE_KEY) {
+        let api = api::AuthorizedApi::new(DEFAULT_API_URL, token);
+        authorized_api.update(|a| *a = Some(api));
+        fetch_user_info.dispatch(());
+    }
+
+    log::debug!("User is logged in: {}", logged_in.get());
+
+    // -- effects -- //
+
+    create_effect(cx, move |_| {
+        log::debug!("API authorization state changed");
+        match authorized_api.get() {
+            Some(api) => {
+                log::debug!(
+                    "API is now authorized: save token in LocalStorage"
+                );
+                LocalStorage::set(API_TOKEN_STORAGE_KEY, api.token())
+                    .expect("LocalStorage::set");
+            }
+            None => {
+                log::debug!("API is no longer authorized: delete token from LocalStorage");
+                LocalStorage::delete(API_TOKEN_STORAGE_KEY);
+            }
+        }
+    });
+
+    view! { cx,
+      <Router>
+        <NavBar logged_in on_logout />
+        <main>
+          <Routes>
+            <Route
+              path=Page::Home.path()
+              view=move |cx| view! { cx,
+                <Home user_info = user_info.into() />
+              }
+            />
+            <Route
+              path=Page::Login.path()
+              view=move |cx| view! { cx,
+                <Login
+                  api = unauthorized_api
+                  on_success = move |api| {
+                      log::info!("Successfully logged in");
+                      authorized_api.update(|v| *v = Some(api));
+                      let navigate = use_navigate(cx);
+                      navigate(Page::Home.path(), Default::default()).expect("Home route");
+                      fetch_user_info.dispatch(());
+                  } />
+              }
+            />
+            <Route
+              path=Page::Register.path()
+              view=move |cx| view! { cx,
+                <Register api = unauthorized_api />
+              }
+            />
+          </Routes>
+        </main>
+      </Router>
+    }
+}

examples/login_with_token_csr_only/client/src/main.rs

@@ -0,0 +1,9 @@
+use leptos::*;
+
+use client::*;
+
+pub fn main() {
+    _ = console_log::init_with_level(log::Level::Debug);
+    console_error_panic_hook::set_once();
+    mount_to_body(|cx| view! { cx, <App /> })
+}

examples/login_with_token_csr_only/client/src/pages/home.rs

@@ -0,0 +1,20 @@
+use crate::Page;
+use api_boundary::UserInfo;
+use leptos::*;
+use leptos_router::*;
+
+#[component]
+pub fn Home(cx: Scope, user_info: Signal<Option<UserInfo>>) -> impl IntoView {
+    view! { cx,
+      <h2>"Leptos Login example"</h2>
+      {move || match user_info.get() {
+        Some(info) => view!{ cx,
+          <p>"You are logged in with "{ info.email }"."</p>
+        }.into_view(cx),
+        None => view!{ cx,
+          <p>"You are not logged in."</p>
+          <A href=Page::Login.path() >"Login now."</A>
+        }.into_view(cx)
+      }}
+    }
+}

examples/login_with_token_csr_only/client/src/pages/login.rs

@@ -0,0 +1,66 @@
+use leptos::*;
+use leptos_router::*;
+
+use api_boundary::*;
+
+use crate::{
+    api::{self, AuthorizedApi, UnauthorizedApi},
+    components::credentials::*,
+    Page,
+};
+
+#[component]
+pub fn Login<F>(cx: Scope, api: UnauthorizedApi, on_success: F) -> impl IntoView
+where
+    F: Fn(AuthorizedApi) + 'static + Clone,
+{
+    let (login_error, set_login_error) = create_signal(cx, None::<String>);
+    let (wait_for_response, set_wait_for_response) = create_signal(cx, false);
+
+    let login_action =
+        create_action(cx, move |(email, password): &(String, String)| {
+            log::debug!("Try to login with {email}");
+            let email = email.to_string();
+            let password = password.to_string();
+            let credentials = Credentials { email, password };
+            let on_success = on_success.clone();
+            async move {
+                set_wait_for_response.update(|w| *w = true);
+                let result = api.login(&credentials).await;
+                set_wait_for_response.update(|w| *w = false);
+                match result {
+                    Ok(res) => {
+                        set_login_error.update(|e| *e = None);
+                        on_success(res);
+                    }
+                    Err(err) => {
+                        let msg = match err {
+                            api::Error::Fetch(js_err) => {
+                                format!("{js_err:?}")
+                            }
+                            api::Error::Api(err) => err.message,
+                        };
+                        error!(
+                            "Unable to login with {}: {msg}",
+                            credentials.email
+                        );
+                        set_login_error.update(|e| *e = Some(msg));
+                    }
+                }
+            }
+        });
+
+    let disabled = Signal::derive(cx, move || wait_for_response.get());
+
+    view! { cx,
+      <CredentialsForm
+        title = "Please login to your account"
+        action_label = "Login"
+        action = login_action
+        error = login_error.into()
+        disabled
+      />
+      <p>"Don't have an account?"</p>
+      <A href=Page::Register.path()>"Register"</A>
+    }
+}

examples/login_with_token_csr_only/client/src/pages/mod.rs

@@ -0,0 +1,23 @@
+pub mod home;
+pub mod login;
+pub mod register;
+
+pub use self::{home::*, login::*, register::*};
+
+#[derive(Debug, Clone, Copy, Default)]
+pub enum Page {
+    #[default]
+    Home,
+    Login,
+    Register,
+}
+
+impl Page {
+    pub fn path(&self) -> &'static str {
+        match self {
+            Self::Home => "/",
+            Self::Login => "/login",
+            Self::Register => "/register",
+        }
+    }
+}

examples/login_with_token_csr_only/client/src/pages/register.rs

@@ -0,0 +1,77 @@
+use leptos::*;
+use leptos_router::*;
+
+use api_boundary::*;
+
+use crate::{
+    api::{self, UnauthorizedApi},
+    components::credentials::*,
+    Page,
+};
+
+#[component]
+pub fn Register(cx: Scope, api: UnauthorizedApi) -> impl IntoView {
+    let (register_response, set_register_response) =
+        create_signal(cx, None::<()>);
+    let (register_error, set_register_error) =
+        create_signal(cx, None::<String>);
+    let (wait_for_response, set_wait_for_response) = create_signal(cx, false);
+
+    let register_action =
+        create_action(cx, move |(email, password): &(String, String)| {
+            let email = email.to_string();
+            let password = password.to_string();
+            let credentials = Credentials { email, password };
+            log!("Try to register new account for {}", credentials.email);
+            async move {
+                set_wait_for_response.update(|w| *w = true);
+                let result = api.register(&credentials).await;
+                set_wait_for_response.update(|w| *w = false);
+                match result {
+                    Ok(res) => {
+                        set_register_response.update(|v| *v = Some(res));
+                        set_register_error.update(|e| *e = None);
+                    }
+                    Err(err) => {
+                        let msg = match err {
+                            api::Error::Fetch(js_err) => {
+                                format!("{js_err:?}")
+                            }
+                            api::Error::Api(err) => err.message,
+                        };
+                        log::warn!(
+                            "Unable to register new account for {}: {msg}",
+                            credentials.email
+                        );
+                        set_register_error.update(|e| *e = Some(msg));
+                    }
+                }
+            }
+        });
+
+    let disabled = Signal::derive(cx, move || wait_for_response.get());
+
+    view! { cx,
+      <Show
+        when = move || register_response.get().is_some()
+        fallback = move |_| view!{ cx,
+          <CredentialsForm
+            title = "Please enter the desired credentials"
+            action_label = "Register"
+            action = register_action
+            error = register_error.into()
+            disabled
+          />
+          <p>"Your already have an account?"</p>
+          <A href=Page::Login.path()>"Login"</A>
+        }
+      >
+        <p>"You have successfully registered."</p>
+        <p>
+         "You can now "
+         <A href=Page::Login.path()>"login"</A>
+         " with your new account."
+        </p>
+      </Show>
+    }
+}

examples/login_with_token_csr_only/server/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "server"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+anyhow = "1.0"
+api-boundary = "*"
+axum = { version = "0.6", features = ["headers"] }
+env_logger = "0.10"
+log = "0.4"
+mailparse = "0.14"
+pwhash = "1.0"
+thiserror = "1.0"
+tokio = { version = "1.25", features = ["macros", "rt-multi-thread"] }
+tower-http = { version = "0.3", features = ["cors"] }
+uuid = { version = "1.3", features = ["v4"] }

examples/login_with_token_csr_only/server/src/adapters.rs

@@ -0,0 +1,114 @@
+use crate::{application::*, Error};
+use api_boundary as json;
+use axum::{
+    http::StatusCode,
+    response::Json,
+    response::{IntoResponse, Response},
+};
+use thiserror::Error;
+
+impl From<InvalidEmailAddress> for json::Error {
+    fn from(_: InvalidEmailAddress) -> Self {
+        Self {
+            message: "Invalid email address".to_string(),
+        }
+    }
+}
+
+impl From<InvalidPassword> for json::Error {
+    fn from(err: InvalidPassword) -> Self {
+        let InvalidPassword::TooShort(min_len) = err;
+        Self {
+            message: format!("Invalid password (min. length = {min_len})"),
+        }
+    }
+}
+
+impl From<CreateUserError> for json::Error {
+    fn from(err: CreateUserError) -> Self {
+        let message = match err {
+            CreateUserError::UserExists => "User already exits".to_string(),
+        };
+        Self { message }
+    }
+}
+
+impl From<LoginError> for json::Error {
+    fn from(err: LoginError) -> Self {
+        let message = match err {
+            LoginError::InvalidEmailOrPassword => {
+                "Invalid email or password".to_string()
+            }
+        };
+        Self { message }
+    }
+}
+
+impl From<LogoutError> for json::Error {
+    fn from(err: LogoutError) -> Self {
+        let message = match err {
+            LogoutError::NotLoggedIn => "No user is logged in".to_string(),
+        };
+        Self { message }
+    }
+}
+
+impl From<AuthError> for json::Error {
+    fn from(err: AuthError) -> Self {
+        let message = match err {
+            AuthError::NotAuthorized => "Not authorized".to_string(),
+        };
+        Self { message }
+    }
+}
+
+impl From<CredentialParsingError> for json::Error {
+    fn from(err: CredentialParsingError) -> Self {
+        match err {
+            CredentialParsingError::EmailAddress(err) => err.into(),
+            CredentialParsingError::Password(err) => err.into(),
+        }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum CredentialParsingError {
+    #[error(transparent)]
+    EmailAddress(#[from] InvalidEmailAddress),
+    #[error(transparent)]
+    Password(#[from] InvalidPassword),
+}
+
+impl TryFrom<json::Credentials> for Credentials {
+    type Error = CredentialParsingError;
+    fn try_from(
+        json::Credentials { email, password }: json::Credentials,
+    ) -> Result<Self, Self::Error> {
+        let email: EmailAddress = email.parse()?;
+        let password = Password::try_from(password)?;
+        Ok(Self { email, password })
+    }
+}
+
+impl IntoResponse for Error {
+    fn into_response(self) -> Response {
+        let (code, value) = match self {
+            Self::Logout(err) => {
+                (StatusCode::BAD_REQUEST, json::Error::from(err))
+            }
+            Self::Login(err) => {
+                (StatusCode::BAD_REQUEST, json::Error::from(err))
+            }
+            Self::Credentials(err) => {
+                (StatusCode::BAD_REQUEST, json::Error::from(err))
+            }
+            Self::CreateUser(err) => {
+                (StatusCode::BAD_REQUEST, json::Error::from(err))
+            }
+            Self::Auth(err) => {
+                (StatusCode::UNAUTHORIZED, json::Error::from(err))
+            }
+        };
+        (code, Json(value)).into_response()
+    }
+}

examples/login_with_token_csr_only/server/src/application.rs

@@ -0,0 +1,159 @@
+use mailparse::addrparse;
+use pwhash::bcrypt;
+use std::{collections::HashMap, str::FromStr, sync::RwLock};
+use thiserror::Error;
+use uuid::Uuid;
+
+#[derive(Default)]
+pub struct AppState {
+    users: RwLock<HashMap<EmailAddress, Password>>,
+    tokens: RwLock<HashMap<Uuid, EmailAddress>>,
+}
+
+impl AppState {
+    pub fn create_user(
+        &self,
+        credentials: Credentials,
+    ) -> Result<(), CreateUserError> {
+        let Credentials { email, password } = credentials;
+        let user_exists = self.users.read().unwrap().get(&email).is_some();
+        if user_exists {
+            return Err(CreateUserError::UserExists);
+        }
+        self.users.write().unwrap().insert(email, password);
+        Ok(())
+    }
+
+    pub fn login(
+        &self,
+        email: EmailAddress,
+        password: &str,
+    ) -> Result<Uuid, LoginError> {
+        let valid_credentials = self
+            .users
+            .read()
+            .unwrap()
+            .get(&email)
+            .map(|hashed_password| hashed_password.verify(password))
+            .unwrap_or(false);
+        if !valid_credentials {
+            Err(LoginError::InvalidEmailOrPassword)
+        } else {
+            let token = Uuid::new_v4();
+            self.tokens.write().unwrap().insert(token, email);
+            Ok(token)
+        }
+    }
+
+    pub fn logout(&self, token: &str) -> Result<(), LogoutError> {
+        let token = token
+            .parse::<Uuid>()
+            .map_err(|_| LogoutError::NotLoggedIn)?;
+        self.tokens.write().unwrap().remove(&token);
+        Ok(())
+    }
+
+    pub fn authorize_user(
+        &self,
+        token: &str,
+    ) -> Result<CurrentUser, AuthError> {
+        token
+            .parse::<Uuid>()
+            .map_err(|_| AuthError::NotAuthorized)
+            .and_then(|token| {
+                self.tokens
+                    .read()
+                    .unwrap()
+                    .get(&token)
+                    .cloned()
+                    .map(|email| CurrentUser { email, token })
+                    .ok_or(AuthError::NotAuthorized)
+            })
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum CreateUserError {
+    #[error("The user already exists")]
+    UserExists,
+}
+
+#[derive(Debug, Error)]
+pub enum LoginError {
+    #[error("Invalid email or password")]
+    InvalidEmailOrPassword,
+}
+
+#[derive(Debug, Error)]
+pub enum LogoutError {
+    #[error("You are not logged in")]
+    NotLoggedIn,
+}
+
+#[derive(Debug, Error)]
+pub enum AuthError {
+    #[error("You are not authorized")]
+    NotAuthorized,
+}
+
+pub struct Credentials {
+    pub email: EmailAddress,
+    pub password: Password,
+}
+
+#[derive(Clone, Eq, PartialEq, Hash)]
+pub struct EmailAddress(String);
+
+#[derive(Debug, Error)]
+#[error("The given email address is invalid")]
+pub struct InvalidEmailAddress;
+
+impl FromStr for EmailAddress {
+    type Err = InvalidEmailAddress;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        addrparse(s)
+            .ok()
+            .and_then(|parsed| parsed.extract_single_info())
+            .map(|single_info| Self(single_info.addr))
+            .ok_or(InvalidEmailAddress)
+    }
+}
+
+impl EmailAddress {
+    pub fn into_string(self) -> String {
+        self.0
+    }
+}
+
+#[derive(Clone)]
+pub struct CurrentUser {
+    pub email: EmailAddress,
+    pub token: Uuid,
+}
+
+const MIN_PASSWORD_LEN: usize = 3;
+
+pub struct Password(String);
+
+impl Password {
+    pub fn verify(&self, password: &str) -> bool {
+        bcrypt::verify(password, &self.0)
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum InvalidPassword {
+    #[error("Password is too short (min. length is {0})")]
+    TooShort(usize),
+}
+
+impl TryFrom<String> for Password {
+    type Error = InvalidPassword;
+    fn try_from(p: String) -> Result<Self, Self::Error> {
+        if p.len() < MIN_PASSWORD_LEN {
+            return Err(InvalidPassword::TooShort(MIN_PASSWORD_LEN));
+        }
+        let hashed = bcrypt::hash(&p).unwrap();
+        Ok(Self(hashed))
+    }
+}

examples/login_with_token_csr_only/server/src/main.rs

@@ -0,0 +1,113 @@
+use std::{env, sync::Arc};
+
+use axum::{
+    extract::{State, TypedHeader},
+    headers::{authorization::Bearer, Authorization},
+    http::Method,
+    response::Json,
+    routing::{get, post},
+    Router,
+};
+use tower_http::cors::{Any, CorsLayer};
+
+use api_boundary as json;
+
+mod adapters;
+mod application;
+
+use self::application::*;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    if let Err(err) = env::var("RUST_LOG") {
+        match err {
+            env::VarError::NotPresent => {
+                env::set_var("RUST_LOG", "debug");
+            }
+            env::VarError::NotUnicode(_) => {
+                return Err(anyhow::anyhow!("The value of 'RUST_LOG' does not contain valid unicode data."));
+            }
+        }
+    }
+    env_logger::init();
+
+    let shared_state = Arc::new(AppState::default());
+
+    let cors_layer = CorsLayer::new()
+        .allow_methods([Method::GET, Method::POST])
+        .allow_origin(Any);
+
+    let app = Router::new()
+        .route("/login", post(login))
+        .route("/logout", post(logout))
+        .route("/users", post(create_user))
+        .route("/users", get(get_user_info))
+        .route_layer(cors_layer)
+        .with_state(shared_state);
+
+    let addr = "0.0.0.0:3000".parse().unwrap();
+    log::info!("Listen on {addr}");
+    axum::Server::bind(&addr)
+        .serve(app.into_make_service())
+        .await?;
+    Ok(())
+}
+
+type Result<T> = std::result::Result<Json<T>, Error>;
+
+/// API error
+#[derive(thiserror::Error, Debug)]
+#[non_exhaustive]
+enum Error {
+    #[error(transparent)]
+    CreateUser(#[from] CreateUserError),
+    #[error(transparent)]
+    Login(#[from] LoginError),
+    #[error(transparent)]
+    Logout(#[from] LogoutError),
+    #[error(transparent)]
+    Auth(#[from] AuthError),
+    #[error(transparent)]
+    Credentials(#[from] adapters::CredentialParsingError),
+}
+
+async fn create_user(
+    State(state): State<Arc<AppState>>,
+    Json(credentials): Json<json::Credentials>,
+) -> Result<()> {
+    let credentials = Credentials::try_from(credentials)?;
+    state.create_user(credentials)?;
+    Ok(Json(()))
+}
+
+async fn login(
+    State(state): State<Arc<AppState>>,
+    Json(credentials): Json<json::Credentials>,
+) -> Result<json::ApiToken> {
+    let json::Credentials { email, password } = credentials;
+    log::debug!("{email} tries to login");
+    let email = email.parse().map_err(|_|
+          // Here we don't want to leak detailed info.
+          LoginError::InvalidEmailOrPassword)?;
+    let token = state.login(email, &password).map(|s| s.to_string())?;
+    Ok(Json(json::ApiToken { token }))
+}
+
+async fn logout(
+    State(state): State<Arc<AppState>>,
+    TypedHeader(auth): TypedHeader<Authorization<Bearer>>,
+) -> Result<()> {
+    state.logout(auth.token())?;
+    Ok(Json(()))
+}
+
+async fn get_user_info(
+    State(state): State<Arc<AppState>>,
+    TypedHeader(auth): TypedHeader<Authorization<Bearer>>,
+) -> Result<json::UserInfo> {
+    let user = state.authorize_user(auth.token())?;
+    let CurrentUser { email, .. } = user;
+    Ok(Json(json::UserInfo {
+        email: email.into_string(),
+    }))
+}

examples/parent_child/src/lib.rs

@@ -7,7 +7,8 @@ use web_sys::MouseEvent;
 //    for the child component to write into and the parent to read
 // 2) <ButtonB/>: passing a closure as one of the child component props, for
 //    the child component to call
-// 4) <ButtonC/>: providing a context that is used in the component (rather than prop drilling)
+// 3) <ButtonC/>: adding an `on:` event listener to a component
+// 4) <ButtonD/>: providing a context that is used in the component (rather than prop drilling)
 
 #[derive(Copy, Clone)]
 struct SmallcapsContext(WriteSignal<bool>);
@@ -17,6 +18,7 @@ pub fn App(cx: Scope) -> impl IntoView {
     // just some signals to toggle three classes on our <p>
     let (red, set_red) = create_signal(cx, false);
     let (right, set_right) = create_signal(cx, false);
+    let (italics, set_italics) = create_signal(cx, false);
     let (smallcaps, set_smallcaps) = create_signal(cx, false);
 
     // the newtype pattern isn't *necessary* here but is a good practice
@@ -31,6 +33,7 @@ pub fn App(cx: Scope) -> impl IntoView {
                 // class: attributes take F: Fn() => bool, and these signals all implement Fn()
                 class:red=red
                 class:right=right
+                class:italics=italics
                 class:smallcaps=smallcaps
             >
                 "Lorem ipsum sit dolor amet."
@@ -42,8 +45,13 @@ pub fn App(cx: Scope) -> impl IntoView {
             // Button B: pass a closure
             <ButtonB on_click=move |_| set_right.update(|value| *value = !*value)/>
 
+            // Button B: use a regular event listener
+            // setting an event listener on a component like this applies it
+            // to each of the top-level elements the component returns
+            <ButtonC on:click=move |_| set_italics.update(|value| *value = !*value)/>
+
             // Button D gets its setter from context rather than props
-            <ButtonC/>
+            <ButtonD/>
         </main>
     }
 }
@@ -53,7 +61,7 @@ pub fn App(cx: Scope) -> impl IntoView {
 pub fn ButtonA(
     cx: Scope,
     /// Signal that will be toggled when the button is clicked.
-    setter: WriteSignal<bool>
+    setter: WriteSignal<bool>,
 ) -> impl IntoView {
     view! {
         cx,
@@ -70,7 +78,7 @@ pub fn ButtonA(
 pub fn ButtonB<F>(
     cx: Scope,
     /// Callback that will be invoked when the button is clicked.
-    on_click: F
+    on_click: F,
 ) -> impl IntoView
 where
     F: Fn(MouseEvent) + 'static,
@@ -97,10 +105,22 @@ where
     // if Rust ever had named function arguments we could drop this requirement
 }
 
+/// Button C is a dummy: it renders a button but doesn't handle
+/// its click. Instead, the parent component adds an event listener.
+#[component]
+pub fn ButtonC(cx: Scope) -> impl IntoView {
+    view! {
+        cx,
+        <button>
+            "Toggle Italics"
+        </button>
+    }
+}
+
 /// Button D is very similar to Button A, but instead of passing the setter as a prop
 /// we get it from the context
 #[component]
-pub fn ButtonC(cx: Scope) -> impl IntoView {
+pub fn ButtonD(cx: Scope) -> impl IntoView {
     let setter = use_context::<SmallcapsContext>(cx).unwrap().0;
 
     view! {

examples/router/src/lib.rs

@@ -71,9 +71,10 @@ pub fn ContactList(cx: Scope) -> impl IntoView {
     });
 
     let location = use_location(cx);
-    let contacts = create_resource(cx, move || location.search.get(), get_contacts);
+    let contacts =
+        create_resource(cx, move || location.search.get(), get_contacts);
     let contacts = move || {
-        contacts.read().map(|contacts| {
+        contacts.read(cx).map(|contacts| {
             // this data doesn't change frequently so we can use .map().collect() instead of a keyed <For/>
             contacts
                 .into_iter()
@@ -126,12 +127,15 @@ pub fn Contact(cx: Scope) -> impl IntoView {
         get_contact,
     );
 
-    let contact_display = move || match contact.read() {
+    let contact_display = move || match contact.read(cx) {
         // None => loading, but will be caught by Suspense fallback
         // I'm only doing this explicitly for the example
         None => None,
         // Some(None) => has loaded and found no contact
-        Some(None) => Some(view! { cx, <p>"No contact with this ID was found."</p> }.into_any()),
+        Some(None) => Some(
+            view! { cx, <p>"No contact with this ID was found."</p> }
+                .into_any(),
+        ),
         // Some(Some) => has loaded and found a contact
         Some(Some(contact)) => Some(
             view! { cx,

examples/ssr_modes/.gitignore

@@ -0,0 +1,13 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+pkg
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# node e2e test tools and outputs
+node_modules/
+test-results/
+end2end/playwright-report/
+playwright/.cache/

examples/ssr_modes/Cargo.toml

@@ -0,0 +1,88 @@
+[package]
+name = "ssr_modes"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+actix-files = { version = "0.6", optional = true }
+actix-web = { version = "4", optional = true, features = ["macros"] }
+console_error_panic_hook = "0.1"
+console_log = "0.2"
+cfg-if = "1"
+lazy_static = "1"
+leptos = { path = "../../leptos", default-features = false, features = [
+  "serde",
+] }
+leptos_meta = { path = "../../meta", default-features = false }
+leptos_actix = { path = "../../integrations/actix", default-features = false, optional = true }
+leptos_router = { path = "../../router", default-features = false }
+log = "0.4"
+serde = { version = "1", features = ["derive"] }
+simple_logger = "4"
+thiserror = "1"
+tokio = { version = "1", features = ["time"] }
+wasm-bindgen = "0.2"
+
+[features]
+hydrate = ["leptos/hydrate", "leptos_meta/hydrate", "leptos_router/hydrate"]
+ssr = [
+  "dep:actix-files",
+  "dep:actix-web",
+  "dep:leptos_actix",
+  "leptos/ssr",
+  "leptos_meta/ssr",
+  "leptos_router/ssr",
+]
+
+[package.metadata.leptos]
+# The name used by wasm-bindgen/cargo-leptos for the JS/WASM bundle. Defaults to the crate name   
+output-name = "ssr_modes"
+# The site root folder is where cargo-leptos generate all output. WARNING: all content of this folder will be erased on a rebuild. Use it in your server setup.
+site-root = "target/site"
+# The site-root relative folder where all compiled output (JS, WASM and CSS) is written
+# Defaults to pkg	
+site-pkg-dir = "pkg"
+# [Optional] The source CSS file. If it ends with .sass or .scss then it will be compiled by dart-sass into CSS. The CSS is optimized by Lightning CSS before being written to <site-root>/<site-pkg>/app.css
+style-file = "style/main.scss"
+# Assets source dir. All files found here will be copied and synchronized to site-root.
+# The assets-dir cannot have a sub directory with the same name/path as site-pkg-dir.
+#
+# Optional. Env: LEPTOS_ASSETS_DIR.
+assets-dir = "assets"
+# The IP and port (ex: 127.0.0.1:3000) where the server serves the content. Use it in your server setup.
+site-addr = "127.0.0.1:3000"
+# The port to use for automatic reload monitoring
+reload-port = 3001
+# [Optional] Command to use when running end2end tests. It will run in the end2end dir.
+#   [Windows] for non-WSL use "npx.cmd playwright test"
+#   This binary name can be checked in Powershell with Get-Command npx
+end2end-cmd = "npx playwright test"
+end2end-dir = "end2end"
+#  The browserlist query used for optimizing the CSS.
+browserquery = "defaults"
+# Set by cargo-leptos watch when building with that tool. Controls whether autoreload JS will be included in the head
+watch = false
+# The environment Leptos will run in, usually either "DEV" or "PROD"
+env = "DEV"
+# The features to use when compiling the bin target
+#
+# Optional. Can be over-ridden with the command line parameter --bin-features
+bin-features = ["ssr"]
+
+# If the --no-default-features flag should be used when compiling the bin target
+#
+# Optional. Defaults to false.
+bin-default-features = false
+
+# The features to use when compiling the lib target
+#
+# Optional. Can be over-ridden with the command line parameter --lib-features
+lib-features = ["hydrate"]
+
+# If the --no-default-features flag should be used when compiling the lib target
+#
+# Optional. Defaults to false.
+lib-default-features = false

examples/ssr_modes/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 henrik
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/ssr_modes/README.md

@@ -0,0 +1,54 @@
+# Server-Side Rendering Modes
+
+This example shows the different "rendering modes" that can be used while server-side 
+rendering an application:
+1. **Synchronous**: Serve an HTML shell that includes `fallback` for any `Suspense`. Load data on the client, replacing `fallback` once they're loaded.
+     - *Pros*: App shell appears very quickly: great TTFB (time to first byte).
+     - *Cons*: Resources load relatively slowly; you need to wait for JS + Wasm to load before even making a request.
+ 2. **Out-of-order streaming**: Serve an HTML shell that includes `fallback` for any `Suspense`. Load data on the **server**, streaming it down to the client as it resolves, and streaming down HTML for `Suspense` nodes.
+     - *Pros*: Combines the best of **synchronous** and **`async`**, with a very fast shell and resources that begin loading on the server.
+     - *Cons*: Requires JS for suspended fragments to appear in correct order. Weaker meta tag support when it depends on data that's under suspense (has already streamed down `<head>`)
+ 3. **In-order streaming**: Walk through the tree, returning HTML synchronously as in synchronous rendering and out-of-order streaming until you hit a `Suspense`. At that point, wait for all its data to load, then render it, then the rest of the tree.
+     - *Pros*: Does not require JS for HTML to appear in correct order.
+     - *Cons*: Loads the shell more slowly than out-of-order streaming or synchronous rendering because it needs to pause at every `Suspense`. Cannot begin hydration until the entire page has loaded, so earlier pieces
+       of the page will not be interactive until the suspended chunks have loaded.
+ 4. **`async`**: Load all resources on the server. Wait until all data are loaded, and render HTML in one sweep.
+     - *Pros*: Better handling for meta tags (because you know async data even before you render the `<head>`). Faster complete load than **synchronous** because async resources begin loading on server.
+     - *Cons*: Slower load time/TTFB: you need to wait for all async resources to load before displaying anything on the client.
+
+## Server Side Rendering with `cargo-leptos`
+`cargo-leptos` is now the easiest and most featureful way to build server side rendered apps with hydration. It provides automatic recompilation of client and server code, wasm optimisation, CSS minification, and more! Check out more about it [here](https://github.com/akesson/cargo-leptos)
+
+1. Install cargo-leptos
+```bash
+cargo install --locked cargo-leptos
+``` 
+2. Build the site in watch mode, recompiling on file changes
+```bash
+cargo leptos watch
+```
+
+Open browser on [http://localhost:3000/](http://localhost:3000/)
+
+3. When ready to deploy, run
+```bash
+cargo leptos build --release
+```
+
+## Server Side Rendering without cargo-leptos
+To run it as a server side app with hydration, you'll need to have wasm-pack installed.
+
+0. Edit the `[package.metadata.leptos]` section and set `site-root` to `"."`. You'll also want to change the path of the `<StyleSheet / >` component in the root component to point towards the CSS file in the root. This tells leptos that the WASM/JS files generated by wasm-pack are available at `./pkg` and that the CSS files are no longer processed by cargo-leptos. Building to alternative folders is not supported at this time. You'll also want to edit the call to `get_configuration()` to pass in `Some(Cargo.toml)`, so that Leptos will read the settings instead of cargo-leptos. If you do so, your file/folder names cannot include dashes.
+1. Install wasm-pack
+```bash
+cargo install wasm-pack
+```
+2. Build the Webassembly used to hydrate the HTML from the server
+```bash
+wasm-pack build --target=web --debug --no-default-features --features=hydrate
+```
+3. Run the server to serve the Webassembly, JS, and HTML 
+```bash
+cargo run --no-default-features --features=ssr
+```
+

examples/ssr_modes/src/app.rs

@@ -0,0 +1,184 @@
+use lazy_static::lazy_static;
+use leptos::*;
+use leptos_meta::*;
+use leptos_router::*;
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[component]
+pub fn App(cx: Scope) -> impl IntoView {
+    // Provides context that manages stylesheets, titles, meta tags, etc.
+    provide_meta_context(cx);
+
+    view! { cx,
+        <Stylesheet id="leptos" href="/pkg/ssr_modes.css"/>
+        <Title text="Welcome to Leptos"/>
+
+        <Router>
+            <main>
+                <Routes>
+                    // We’ll load the home page with out-of-order streaming and <Suspense/>
+                    <Route path="" view=|cx| view! { cx, <HomePage/> }/>
+
+                    // We'll load the posts with async rendering, so they can set
+                    // the title and metadata *after* loading the data
+                    <Route
+                        path="/post/:id"
+                        view=|cx| view! { cx, <Post/> }
+                        ssr=SsrMode::Async
+                    />
+                </Routes>
+            </main>
+        </Router>
+    }
+}
+
+#[component]
+fn HomePage(cx: Scope) -> impl IntoView {
+    // load the posts
+    let posts =
+        create_resource(cx, || (), |_| async { list_post_metadata().await });
+    let posts_view = move || {
+        posts.with(cx, |posts| posts
+            .clone()
+            .map(|posts| {
+                posts.iter()
+                .map(|post| view! { cx, <li><a href=format!("/post/{}", post.id)>{&post.title}</a></li>})
+                .collect::<Vec<_>>()
+            })
+        )
+    };
+
+    view! { cx,
+        <h1>"My Great Blog"</h1>
+        <Suspense fallback=move || view! { cx, <p>"Loading posts..."</p> }>
+            <ul>{posts_view}</ul>
+        </Suspense>
+    }
+}
+
+#[derive(Params, Copy, Clone, Debug, PartialEq, Eq)]
+pub struct PostParams {
+    id: usize,
+}
+
+#[component]
+fn Post(cx: Scope) -> impl IntoView {
+    let query = use_params::<PostParams>(cx);
+    let id = move || {
+        query.with(|q| {
+            q.as_ref().map(|q| q.id).map_err(|_| PostError::InvalidId)
+        })
+    };
+    let post = create_resource(cx, id, |id| async move {
+        match id {
+            Err(e) => Err(e),
+            Ok(id) => get_post(id)
+                .await
+                .map(|data| data.ok_or(PostError::PostNotFound))
+                .map_err(|_| PostError::ServerError)
+                .flatten(),
+        }
+    });
+
+    let post_view = move || {
+        post.with(cx, |post| {
+            post.clone().map(|post| {
+                view! { cx,
+                    // render content
+                    <h1>{&post.title}</h1>
+                    <p>{&post.content}</p>
+
+                    // since we're using async rendering for this page,
+                    // this metadata should be included in the actual HTML <head>
+                    // when it's first served
+                    <Title text=post.title/>
+                    <Meta name="description" content=post.content/>
+                }
+            })
+        })
+    };
+
+    view! { cx,
+        <Suspense fallback=move || view! { cx, <p>"Loading post..."</p> }>
+            <ErrorBoundary fallback=|cx, errors| {
+                view! { cx,
+                    <div class="error">
+                        <h1>"Something went wrong."</h1>
+                        <ul>
+                        {move || errors.get()
+                            .into_iter()
+                            .map(|(_, error)| view! { cx, <li>{error.to_string()} </li> })
+                            .collect::<Vec<_>>()
+                        }
+                        </ul>
+                    </div>
+                }
+            }>
+                {post_view}
+            </ErrorBoundary>
+        </Suspense>
+    }
+}
+
+// Dummy API
+lazy_static! {
+    static ref POSTS: Vec<Post> = vec![
+        Post {
+            id: 0,
+            title: "My first post".to_string(),
+            content: "This is my first post".to_string(),
+        },
+        Post {
+            id: 1,
+            title: "My second post".to_string(),
+            content: "This is my second post".to_string(),
+        },
+        Post {
+            id: 2,
+            title: "My third post".to_string(),
+            content: "This is my third post".to_string(),
+        },
+    ];
+}
+
+#[derive(Error, Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub enum PostError {
+    #[error("Invalid post ID.")]
+    InvalidId,
+    #[error("Post not found.")]
+    PostNotFound,
+    #[error("Server error.")]
+    ServerError,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Post {
+    id: usize,
+    title: String,
+    content: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct PostMetadata {
+    id: usize,
+    title: String,
+}
+
+#[server(ListPostMetadata, "/api")]
+pub async fn list_post_metadata() -> Result<Vec<PostMetadata>, ServerFnError> {
+    tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+    Ok(POSTS
+        .iter()
+        .map(|data| PostMetadata {
+            id: data.id,
+            title: data.title.clone(),
+        })
+        .collect())
+}
+
+#[server(GetPost, "/api")]
+pub async fn get_post(id: usize) -> Result<Option<Post>, ServerFnError> {
+    tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+    Ok(POSTS.iter().find(|post| post.id == id).cloned())
+}

examples/ssr_modes/src/lib.rs

@@ -0,0 +1,25 @@
+#![feature(result_flattening)]
+
+pub mod app;
+use cfg_if::cfg_if;
+
+cfg_if! {
+if #[cfg(feature = "hydrate")] {
+
+  use wasm_bindgen::prelude::wasm_bindgen;
+
+    #[wasm_bindgen]
+    pub fn hydrate() {
+      use app::*;
+      use leptos::*;
+
+      // initializes logging using the `log` crate
+      _ = console_log::init_with_level(log::Level::Debug);
+      console_error_panic_hook::set_once();
+
+      leptos::mount_to_body(move |cx| {
+          view! { cx, <App/> }
+      });
+    }
+}
+}

examples/ssr_modes/src/main.rs

@@ -0,0 +1,42 @@
+#[cfg(feature = "ssr")]
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    use actix_files::Files;
+    use actix_web::*;
+    use leptos::*;
+    use leptos_actix::{generate_route_list, LeptosRoutes};
+    use ssr_modes::app::*;
+
+    let conf = get_configuration(None).await.unwrap();
+    let addr = conf.leptos_options.site_addr;
+    // Generate the list of routes in your Leptos App
+    let routes = generate_route_list(|cx| view! { cx, <App/> });
+
+    GetPost::register();
+    ListPostMetadata::register();
+
+    HttpServer::new(move || {
+        let leptos_options = &conf.leptos_options;
+        let site_root = &leptos_options.site_root;
+
+        App::new()
+            .route("/api/{tail:.*}", leptos_actix::handle_server_fns())
+            .leptos_routes(
+                leptos_options.to_owned(),
+                routes.to_owned(),
+                |cx| view! { cx, <App/> },
+            )
+            .service(Files::new("/", site_root))
+        //.wrap(middleware::Compress::default())
+    })
+    .bind(&addr)?
+    .run()
+    .await
+}
+
+#[cfg(not(feature = "ssr"))]
+pub fn main() {
+    // no client-side main function
+    // unless we want this to work with e.g., Trunk for pure client-side testing
+    // see lib.rs for hydration function instead
+}

examples/ssr_modes/style/main.scss

@@ -0,0 +1,3 @@
+body {
+	font-family: sans-serif;
+}

examples/ssr_modes_axum/.gitignore

@@ -0,0 +1,13 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+pkg
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# node e2e test tools and outputs
+node_modules/
+test-results/
+end2end/playwright-report/
+playwright/.cache/

examples/ssr_modes_axum/Cargo.toml

@@ -0,0 +1,91 @@
+[package]
+name = "ssr_modes_axum"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+console_error_panic_hook = "0.1"
+console_log = "0.2"
+cfg-if = "1"
+lazy_static = "1"
+leptos = { path = "../../leptos", default-features = false, features = [
+  "serde",
+] }
+leptos_meta = { path = "../../meta", default-features = false }
+leptos_axum = { path = "../../integrations/axum", default-features = false, optional = true }
+leptos_router = { path = "../../router", default-features = false }
+log = "0.4"
+serde = { version = "1", features = ["derive"] }
+simple_logger = "4"
+thiserror = "1"
+axum = { version = "0.6.1", optional = true }
+tower = { version = "0.4.13", optional = true }
+tower-http = { version = "0.3.4", features = ["fs"], optional = true }
+tokio = { version = "1", features = ["time"], optional = true}
+wasm-bindgen = "0.2"
+
+[features]
+hydrate = ["leptos/hydrate", "leptos_meta/hydrate", "leptos_router/hydrate"]
+ssr = [
+  "dep:axum",
+  "dep:tower",
+  "dep:tower-http",
+  "dep:tokio",
+  "leptos/ssr",
+  "leptos_meta/ssr",
+  "leptos_router/ssr",
+  "dep:leptos_axum",
+]
+
+[package.metadata.leptos]
+# The name used by wasm-bindgen/cargo-leptos for the JS/WASM bundle. Defaults to the crate name   
+output-name = "ssr_modes"
+# The site root folder is where cargo-leptos generate all output. WARNING: all content of this folder will be erased on a rebuild. Use it in your server setup.
+site-root = "target/site"
+# The site-root relative folder where all compiled output (JS, WASM and CSS) is written
+# Defaults to pkg	
+site-pkg-dir = "pkg"
+# [Optional] The source CSS file. If it ends with .sass or .scss then it will be compiled by dart-sass into CSS. The CSS is optimized by Lightning CSS before being written to <site-root>/<site-pkg>/app.css
+style-file = "style/main.scss"
+# Assets source dir. All files found here will be copied and synchronized to site-root.
+# The assets-dir cannot have a sub directory with the same name/path as site-pkg-dir.
+#
+# Optional. Env: LEPTOS_ASSETS_DIR.
+assets-dir = "assets"
+# The IP and port (ex: 127.0.0.1:3000) where the server serves the content. Use it in your server setup.
+site-addr = "127.0.0.1:3000"
+# The port to use for automatic reload monitoring
+reload-port = 3001
+# [Optional] Command to use when running end2end tests. It will run in the end2end dir.
+#   [Windows] for non-WSL use "npx.cmd playwright test"
+#   This binary name can be checked in Powershell with Get-Command npx
+end2end-cmd = "npx playwright test"
+end2end-dir = "end2end"
+#  The browserlist query used for optimizing the CSS.
+browserquery = "defaults"
+# Set by cargo-leptos watch when building with that tool. Controls whether autoreload JS will be included in the head
+watch = false
+# The environment Leptos will run in, usually either "DEV" or "PROD"
+env = "DEV"
+# The features to use when compiling the bin target
+#
+# Optional. Can be over-ridden with the command line parameter --bin-features
+bin-features = ["ssr"]
+
+# If the --no-default-features flag should be used when compiling the bin target
+#
+# Optional. Defaults to false.
+bin-default-features = false
+
+# The features to use when compiling the lib target
+#
+# Optional. Can be over-ridden with the command line parameter --lib-features
+lib-features = ["hydrate"]
+
+# If the --no-default-features flag should be used when compiling the lib target
+#
+# Optional. Defaults to false.
+lib-default-features = false

examples/ssr_modes_axum/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 henrik
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/ssr_modes_axum/README.md

@@ -0,0 +1,54 @@
+# Server-Side Rendering Modes
+
+This example shows the different "rendering modes" that can be used while server-side 
+rendering an application:
+1. **Synchronous**: Serve an HTML shell that includes `fallback` for any `Suspense`. Load data on the client, replacing `fallback` once they're loaded.
+     - *Pros*: App shell appears very quickly: great TTFB (time to first byte).
+     - *Cons*: Resources load relatively slowly; you need to wait for JS + Wasm to load before even making a request.
+ 2. **Out-of-order streaming**: Serve an HTML shell that includes `fallback` for any `Suspense`. Load data on the **server**, streaming it down to the client as it resolves, and streaming down HTML for `Suspense` nodes.
+     - *Pros*: Combines the best of **synchronous** and **`async`**, with a very fast shell and resources that begin loading on the server.
+     - *Cons*: Requires JS for suspended fragments to appear in correct order. Weaker meta tag support when it depends on data that's under suspense (has already streamed down `<head>`)
+ 3. **In-order streaming**: Walk through the tree, returning HTML synchronously as in synchronous rendering and out-of-order streaming until you hit a `Suspense`. At that point, wait for all its data to load, then render it, then the rest of the tree.
+     - *Pros*: Does not require JS for HTML to appear in correct order.
+     - *Cons*: Loads the shell more slowly than out-of-order streaming or synchronous rendering because it needs to pause at every `Suspense`. Cannot begin hydration until the entire page has loaded, so earlier pieces
+       of the page will not be interactive until the suspended chunks have loaded.
+ 4. **`async`**: Load all resources on the server. Wait until all data are loaded, and render HTML in one sweep.
+     - *Pros*: Better handling for meta tags (because you know async data even before you render the `<head>`). Faster complete load than **synchronous** because async resources begin loading on server.
+     - *Cons*: Slower load time/TTFB: you need to wait for all async resources to load before displaying anything on the client.
+
+## Server Side Rendering with `cargo-leptos`
+`cargo-leptos` is now the easiest and most featureful way to build server side rendered apps with hydration. It provides automatic recompilation of client and server code, wasm optimisation, CSS minification, and more! Check out more about it [here](https://github.com/akesson/cargo-leptos)
+
+1. Install cargo-leptos
+```bash
+cargo install --locked cargo-leptos
+``` 
+2. Build the site in watch mode, recompiling on file changes
+```bash
+cargo leptos watch
+```
+
+Open browser on [http://localhost:3000/](http://localhost:3000/)
+
+3. When ready to deploy, run
+```bash
+cargo leptos build --release
+```
+
+## Server Side Rendering without cargo-leptos
+To run it as a server side app with hydration, you'll need to have wasm-pack installed.
+
+0. Edit the `[package.metadata.leptos]` section and set `site-root` to `"."`. You'll also want to change the path of the `<StyleSheet / >` component in the root component to point towards the CSS file in the root. This tells leptos that the WASM/JS files generated by wasm-pack are available at `./pkg` and that the CSS files are no longer processed by cargo-leptos. Building to alternative folders is not supported at this time. You'll also want to edit the call to `get_configuration()` to pass in `Some(Cargo.toml)`, so that Leptos will read the settings instead of cargo-leptos. If you do so, your file/folder names cannot include dashes.
+1. Install wasm-pack
+```bash
+cargo install wasm-pack
+```
+2. Build the Webassembly used to hydrate the HTML from the server
+```bash
+wasm-pack build --target=web --debug --no-default-features --features=hydrate
+```
+3. Run the server to serve the Webassembly, JS, and HTML 
+```bash
+cargo run --no-default-features --features=ssr
+```
+

examples/ssr_modes_axum/src/app.rs

@@ -0,0 +1,189 @@
+use lazy_static::lazy_static;
+use leptos::*;
+use leptos_meta::*;
+use leptos_router::*;
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[component]
+pub fn App(cx: Scope) -> impl IntoView {
+    // Provides context that manages stylesheets, titles, meta tags, etc.
+    provide_meta_context(cx);
+
+    view! { cx,
+        <Stylesheet id="leptos" href="/pkg/ssr_modes.css"/>
+        <Title text="Welcome to Leptos"/>
+
+        <Router>
+            <main>
+                <Routes>
+                    // We’ll load the home page with out-of-order streaming and <Suspense/>
+                    <Route path="" view=|cx| view! { cx, <HomePage/> }/>
+
+                    // We'll load the posts with async rendering, so they can set
+                    // the title and metadata *after* loading the data
+                    <Route
+                        path="/post/:id"
+                        view=|cx| view! { cx, <Post/> }
+                        ssr=SsrMode::Async
+                    />
+                    <Route
+                        path="/post_in_order/:id"
+                        view=|cx| view! { cx, <Post/> }
+                        ssr=SsrMode::InOrder
+                    />
+                </Routes>
+            </main>
+        </Router>
+    }
+}
+
+#[component]
+fn HomePage(cx: Scope) -> impl IntoView {
+    // load the posts
+    let posts =
+        create_resource(cx, || (), |_| async { list_post_metadata().await });
+    let posts_view = move || {
+        posts.with(cx, |posts| posts
+            .clone()
+            .map(|posts| {
+                posts.iter()
+                .map(|post| view! { cx, <li><a href=format!("/post/{}", post.id)>{&post.title}</a> "|" <a href=format!("/post_in_order/{}", post.id)>{&post.title}"(in order)"</a></li>})
+                .collect::<Vec<_>>()
+            })
+        )
+    };
+
+    view! { cx,
+        <h1>"My Great Blog"</h1>
+        <Suspense fallback=move || view! { cx, <p>"Loading posts..."</p> }>
+            <ul>{posts_view}</ul>
+        </Suspense>
+    }
+}
+
+#[derive(Params, Copy, Clone, Debug, PartialEq, Eq)]
+pub struct PostParams {
+    id: usize,
+}
+
+#[component]
+fn Post(cx: Scope) -> impl IntoView {
+    let query = use_params::<PostParams>(cx);
+    let id = move || {
+        query.with(|q| {
+            q.as_ref().map(|q| q.id).map_err(|_| PostError::InvalidId)
+        })
+    };
+    let post = create_resource(cx, id, |id| async move {
+        match id {
+            Err(e) => Err(e),
+            Ok(id) => get_post(id)
+                .await
+                .map(|data| data.ok_or(PostError::PostNotFound))
+                .map_err(|_| PostError::ServerError)
+                .flatten(),
+        }
+    });
+
+    let post_view = move || {
+        post.with(cx, |post| {
+            post.clone().map(|post| {
+                view! { cx,
+                    // render content
+                    <h1>{&post.title}</h1>
+                    <p>{&post.content}</p>
+
+                    // since we're using async rendering for this page,
+                    // this metadata should be included in the actual HTML <head>
+                    // when it's first served
+                    <Title text=post.title/>
+                    <Meta name="description" content=post.content/>
+                }
+            })
+        })
+    };
+
+    view! { cx,
+        <Suspense fallback=move || view! { cx, <p>"Loading post..."</p> }>
+            <ErrorBoundary fallback=|cx, errors| {
+                view! { cx,
+                    <div class="error">
+                        <h1>"Something went wrong."</h1>
+                        <ul>
+                        {move || errors.get()
+                            .into_iter()
+                            .map(|(_, error)| view! { cx, <li>{error.to_string()} </li> })
+                            .collect::<Vec<_>>()
+                        }
+                        </ul>
+                    </div>
+                }
+            }>
+                {post_view}
+            </ErrorBoundary>
+        </Suspense>
+    }
+}
+
+// Dummy API
+lazy_static! {
+    static ref POSTS: Vec<Post> = vec![
+        Post {
+            id: 0,
+            title: "My first post".to_string(),
+            content: "This is my first post".to_string(),
+        },
+        Post {
+            id: 1,
+            title: "My second post".to_string(),
+            content: "This is my second post".to_string(),
+        },
+        Post {
+            id: 2,
+            title: "My third post".to_string(),
+            content: "This is my third post".to_string(),
+        },
+    ];
+}
+
+#[derive(Error, Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub enum PostError {
+    #[error("Invalid post ID.")]
+    InvalidId,
+    #[error("Post not found.")]
+    PostNotFound,
+    #[error("Server error.")]
+    ServerError,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Post {
+    id: usize,
+    title: String,
+    content: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct PostMetadata {
+    id: usize,
+    title: String,
+}
+
+#[server(ListPostMetadata, "/api")]
+pub async fn list_post_metadata() -> Result<Vec<PostMetadata>, ServerFnError> {
+    tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+    Ok(POSTS
+        .iter()
+        .map(|data| PostMetadata {
+            id: data.id,
+            title: data.title.clone(),
+        })
+        .collect())
+}
+
+#[server(GetPost, "/api")]
+pub async fn get_post(id: usize) -> Result<Option<Post>, ServerFnError> {
+    tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+    Ok(POSTS.iter().find(|post| post.id == id).cloned())
+}

examples/ssr_modes_axum/src/fallback.rs

@@ -0,0 +1,45 @@
+use cfg_if::cfg_if;
+
+cfg_if! { if #[cfg(feature = "ssr")] {
+    use axum::{
+        body::{boxed, Body, BoxBody},
+        extract::Extension,
+        response::IntoResponse,
+        http::{Request, Response, StatusCode, Uri},
+    };
+    use axum::response::Response as AxumResponse;
+    use tower::ServiceExt;
+    use tower_http::services::ServeDir;
+    use std::sync::Arc;
+    use leptos::{LeptosOptions, Errors, view};
+    use crate::app::{App, AppProps};
+
+    pub async fn file_and_error_handler(uri: Uri, Extension(options): Extension<Arc<LeptosOptions>>, req: Request<Body>) -> AxumResponse {
+        let options = &*options;
+        let root = options.site_root.clone();
+        let res = get_static_file(uri.clone(), &root).await.unwrap();
+
+        if res.status() == StatusCode::OK {
+           res.into_response()
+        } else{
+            let handler = leptos_axum::render_app_to_stream(
+                options.to_owned(),
+                move |cx| view!{ cx, <App/> }
+            );
+            handler(req).await.into_response()
+        }
+    }
+
+    async fn get_static_file(uri: Uri, root: &str) -> Result<Response<BoxBody>, (StatusCode, String)> {
+        let req = Request::builder().uri(uri.clone()).body(Body::empty()).unwrap();
+        // `ServeDir` implements `tower::Service` so we can call it with `tower::ServiceExt::oneshot`
+        // This path is relative to the cargo root
+        match ServeDir::new(root).oneshot(req).await {
+            Ok(res) => Ok(res.map(boxed)),
+            Err(err) => Err((
+                StatusCode::INTERNAL_SERVER_ERROR,
+                format!("Something went wrong: {err}"),
+            )),
+        }
+    }
+}}

examples/ssr_modes_axum/src/lib.rs

@@ -0,0 +1,26 @@
+#![feature(result_flattening)]
+
+pub mod app;
+pub mod fallback;
+use cfg_if::cfg_if;
+
+cfg_if! {
+if #[cfg(feature = "hydrate")] {
+
+  use wasm_bindgen::prelude::wasm_bindgen;
+
+    #[wasm_bindgen]
+    pub fn hydrate() {
+      use app::*;
+      use leptos::*;
+
+      // initializes logging using the `log` crate
+      _ = console_log::init_with_level(log::Level::Debug);
+      console_error_panic_hook::set_once();
+
+      leptos::mount_to_body(move |cx| {
+          view! { cx, <App/> }
+      });
+    }
+}
+}

examples/ssr_modes_axum/src/main.rs

@@ -0,0 +1,40 @@
+#[cfg(feature = "ssr")]
+#[tokio::main]
+async fn main(){
+    use leptos::*;
+    use leptos_axum::{generate_route_list, LeptosRoutes};
+    use axum::{extract::{Extension, Path}, Router, routing::{get, post}};
+    use std::sync::Arc;
+    use ssr_modes_axum::fallback::file_and_error_handler;
+    use ssr_modes_axum::app::*;
+
+    let conf = get_configuration(None).await.unwrap();
+    let addr = conf.leptos_options.site_addr;
+    let leptos_options = conf.leptos_options;
+    // Generate the list of routes in your Leptos App
+    let routes = generate_route_list(|cx| view! { cx, <App/> }).await;
+
+    GetPost::register();
+    ListPostMetadata::register();
+
+    let app = Router::new()
+        .route("/api/*fn_name", post(leptos_axum::handle_server_fns))
+        .leptos_routes(leptos_options.clone(), routes, |cx| view! { cx, <App/> })
+        .fallback(file_and_error_handler)
+        .layer(Extension(Arc::new(leptos_options)));
+
+    // run our app with hyper
+    // `axum::Server` is a re-export of `hyper::Server`
+    log!("listening on http://{}", &addr);
+    axum::Server::bind(&addr)
+        .serve(app.into_make_service())
+        .await
+        .unwrap();
+}
+
+#[cfg(not(feature = "ssr"))]
+pub fn main() {
+    // no client-side main function
+    // unless we want this to work with e.g., Trunk for pure client-side testing
+    // see lib.rs for hydration function instead
+}

examples/ssr_modes_axum/style/main.scss

@@ -0,0 +1,3 @@
+body {
+	font-family: sans-serif;
+}

examples/todo_app_sqlite/src/todo.rs

@@ -140,7 +140,7 @@ pub fn Todos(cx: Scope) -> impl IntoView {
                 {move || {
                     let existing_todos = {
                         move || {
-                            todos.read()
+                            todos.read(cx)
                                 .map(move |todos| match todos {
                                     Err(e) => {
                                         vec![view! { cx, <pre class="error">"Server Error: " {e.to_string()}</pre>}.into_any()]

examples/todo_app_sqlite_axum/src/todo.rs

@@ -159,7 +159,7 @@ pub fn Todos(cx: Scope) -> impl IntoView {
                 {move || {
                     let existing_todos = {
                         move || {
-                            todos.read()
+                            todos.read(cx)
                                 .map(move |todos| match todos {
                                     Err(e) => {
                                         vec![view! { cx, <pre class="error">"Server Error: " {e.to_string()}</pre>}.into_any()]

examples/todo_app_sqlite_viz/Cargo.toml

@@ -0,0 +1,99 @@
+[package]
+name = "todo_app_sqlite_viz"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+anyhow = "1.0.66"
+console_log = "0.2.0"
+console_error_panic_hook = "0.1.7"
+futures = "0.3.25"
+cfg-if = "1.0.0"
+leptos = { path = "../../leptos", default-features = false, features = [
+	"serde",
+] }
+leptos_viz = { path = "../../integrations/viz", default-features = false, optional = true }
+leptos_meta = { path = "../../meta", default-features = false }
+leptos_router = { path = "../../router", default-features = false }
+leptos_reactive = { path = "../../leptos_reactive", default-features = false }
+log = "0.4.17"
+simple_logger = "4.0.0"
+serde = { version = "1.0.148", features = ["derive"] }
+serde_json = "1.0.89"
+gloo-net = { version = "0.2.5", features = ["http"] }
+reqwest = { version = "0.11.13", features = ["json"] }
+viz = { version = "0.4.8", features = ["serve"], optional = true }
+tokio = { version = "1.25.0", features = ["full"], optional = true }
+http = { version = "0.2.8" }
+sqlx = { version = "0.6.2", features = [
+	"runtime-tokio-rustls",
+	"sqlite",
+], optional = true }
+thiserror = "1.0.38"
+tracing = "0.1.37"
+wasm-bindgen = "0.2"
+
+[features]
+default = ["csr"]
+csr = ["leptos/csr", "leptos_meta/csr", "leptos_router/csr"]
+hydrate = ["leptos/hydrate", "leptos_meta/hydrate", "leptos_router/hydrate"]
+ssr = [
+  "dep:viz",
+  "dep:tokio",
+  "dep:sqlx",
+  "leptos/ssr",
+  "leptos_meta/ssr",
+  "leptos_router/ssr",
+  "dep:leptos_viz"
+]
+
+[package.metadata.cargo-all-features]
+denylist = ["viz", "tokio", "sqlx", "leptos_viz"]
+skip_feature_sets = [["csr", "ssr"], ["csr", "hydrate"], ["ssr", "hydrate"]]
+
+[package.metadata.leptos]
+# The name used by wasm-bindgen/cargo-leptos for the JS/WASM bundle. Defaults to the crate name
+output-name = "todo_app_sqlite_viz"
+# The site root folder is where cargo-leptos generate all output. WARNING: all content of this folder will be erased on a rebuild. Use it in your server setup.
+site-root = "target/site"
+# The site-root relative folder where all compiled output (JS, WASM and CSS) is written
+# Defaults to pkg
+site-pkg-dir = "pkg"
+# [Optional] The source CSS file. If it ends with .sass or .scss then it will be compiled by dart-sass into CSS. The CSS is optimized by Lightning CSS before being written to <site-root>/<site-pkg>/app.css
+style-file = "./style.css"
+# [Optional] Files in the asset-dir will be copied to the site-root directory
+assets-dir = "public"
+# The IP and port (ex: 127.0.0.1:3000) where the server serves the content. Use it in your server setup.
+site-addr = "127.0.0.1:3000"
+# The port to use for automatic reload monitoring
+reload-port = 3001
+# [Optional] Command to use when running end2end tests. It will run in the end2end dir.
+end2end-cmd = "npx playwright test"
+#  The browserlist query used for optimizing the CSS.
+browserquery = "defaults"
+# Set by cargo-leptos watch when building with tha tool. Controls whether autoreload JS will be included in the head
+watch = false
+# The environment Leptos will run in, usually either "DEV" or "PROD"
+env = "DEV"
+# The features to use when compiling the bin target
+#
+# Optional. Can be over-ridden with the command line parameter --bin-features
+bin-features = ["ssr"]
+
+# If the --no-default-features flag should be used when compiling the bin target
+#
+# Optional. Defaults to false.
+bin-default-features = false
+
+# The features to use when compiling the lib target
+#
+# Optional. Can be over-ridden with the command line parameter --lib-features
+lib-features = ["hydrate"]
+
+# If the --no-default-features flag should be used when compiling the lib target
+#
+# Optional. Defaults to false.
+lib-default-features = false

examples/todo_app_sqlite_viz/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Greg Johnston
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/todo_app_sqlite_viz/Makefile.toml

@@ -0,0 +1,9 @@
+[tasks.build]
+command = "cargo"
+args = ["+nightly", "build-all-features"]
+install_crate = "cargo-all-features"
+
+[tasks.check]
+command = "cargo"
+args = ["+nightly", "check-all-features"]
+install_crate = "cargo-all-features"

examples/todo_app_sqlite_viz/README.md

@@ -0,0 +1,42 @@
+# Leptos Todo App Sqlite with Viz
+
+This example creates a basic todo app with a Viz backend that uses Leptos' server functions to call sqlx from the client and seamlessly run it on the server.
+
+## Client Side Rendering
+This example cannot be built as a trunk standalone CSR-only app. Only the server may directly connect to the database.
+
+## Server Side Rendering with cargo-leptos
+cargo-leptos is now the easiest and most featureful way to build server side rendered apps with hydration. It provides automatic recompilation of client and server code, wasm optimisation, CSS minification, and more! Check out more about it [here](https://github.com/akesson/cargo-leptos)
+
+1. Install cargo-leptos
+```bash
+cargo install --locked cargo-leptos
+``` 
+2. Build the site in watch mode, recompiling on file changes
+```bash
+cargo leptos watch
+```
+
+Open browser on [http://localhost:3000/](http://localhost:3000/)
+
+3. When ready to deploy, run
+```bash
+cargo leptos build --release
+```
+
+## Server Side Rendering without cargo-leptos
+To run it as a server side app with hydration, you'll need to have wasm-pack installed.
+
+0. Edit the `[package.metadata.leptos]` section and set `site-root` to `"."`. You'll also want to change the path of the `<StyleSheet / >` component in the root component to point towards the CSS file in the root. This tells leptos that the WASM/JS files generated by wasm-pack are available at `./pkg` and that the CSS files are no longer processed by cargo-leptos. Building to alternative folders is not supported at this time. You'll also want to edit the call to `get_configuration()` to pass in `Some(Cargo.toml)`, so that Leptos will read the settings instead of cargo-leptos. If you do so, your file/folder names cannot include dashes.
+1. Install wasm-pack
+```bash
+cargo install wasm-pack
+```
+2. Build the Webassembly used to hydrate the HTML from the server
+```bash
+wasm-pack build --target=web --debug --no-default-features --features=hydrate
+```
+3. Run the server to serve the Webassembly, JS, and HTML 
+```bash
+cargo run --no-default-features --features=ssr
+```

examples/todo_app_sqlite_viz/migrations/20221118172000_create_todo_table.sql

@@ -0,0 +1,7 @@
+
+CREATE TABLE IF NOT EXISTS todos
+(
+  id          INTEGER NOT NULL PRIMARY KEY,
+  title       VARCHAR,
+  completed   BOOLEAN
+);

examples/todo_app_sqlite_viz/src/error_template.rs

@@ -0,0 +1,61 @@
+use crate::errors::TodoAppError;
+use cfg_if::cfg_if;
+use leptos::{Errors, *};
+#[cfg(feature = "ssr")]
+use leptos_viz::ResponseOptions;
+
+// A basic function to display errors served by the error boundaries. Feel free to do more complicated things
+// here than just displaying them
+#[component]
+pub fn ErrorTemplate(
+    cx: Scope,
+    #[prop(optional)] outside_errors: Option<Errors>,
+    #[prop(optional)] errors: Option<RwSignal<Errors>>,
+) -> impl IntoView {
+    let errors = match outside_errors {
+        Some(e) => create_rw_signal(cx, e),
+        None => match errors {
+            Some(e) => e,
+            None => panic!("No Errors found and we expected errors!"),
+        },
+    };
+
+    // Get Errors from Signal
+    // Downcast lets us take a type that implements `std::error::Error`
+    let errors: Vec<TodoAppError> = errors
+        .get()
+        .into_iter()
+        .filter_map(|(_k, v)| v.downcast_ref::<TodoAppError>().cloned())
+        .collect();
+
+    // Only the response code for the first error is actually sent from the server
+    // this may be customized by the specific application
+    cfg_if! {
+      if #[cfg(feature="ssr")]{
+        let response = use_context::<ResponseOptions>(cx);
+        if let Some(response) = response{
+          response.set_status(errors[0].status_code());
+        }
+      }
+    }
+
+    view! {cx,
+      <h1>"Errors"</h1>
+      <For
+        // a function that returns the items we're iterating over; a signal is fine
+        each= move || {errors.clone().into_iter().enumerate()}
+        // a unique key for each item as a reference
+        key=|(index, _error)| *index
+        // renders each item to a view
+        view= move |cx, error| {
+        let error_string = error.1.to_string();
+        let error_code= error.1.status_code();
+          view! {
+            cx,
+            <h2>{error_code.to_string()}</h2>
+            <p>"Error: " {error_string}</p>
+          }
+        }
+      />
+    }
+}

examples/todo_app_sqlite_viz/src/errors.rs

@@ -0,0 +1,21 @@
+use http::status::StatusCode;
+use thiserror::Error;
+
+#[derive(Debug, Clone, Error)]
+pub enum TodoAppError {
+    #[error("Not Found")]
+    NotFound,
+    #[error("Internal Server Error")]
+    InternalServerError,
+}
+
+impl TodoAppError {
+    pub fn status_code(&self) -> StatusCode {
+        match self {
+            TodoAppError::NotFound => StatusCode::NOT_FOUND,
+            TodoAppError::InternalServerError => {
+                StatusCode::INTERNAL_SERVER_ERROR
+            }
+        }
+    }
+}

examples/todo_app_sqlite_viz/src/fallback.rs

@@ -0,0 +1,58 @@
+use cfg_if::cfg_if;
+
+cfg_if! {
+if #[cfg(feature = "ssr")] {
+    use crate::{
+        error_template::{ErrorTemplate, ErrorTemplateProps},
+        errors::TodoAppError,
+    };
+    use http::Uri;
+    use leptos::{view, Errors, LeptosOptions};
+    use std::sync::Arc;
+    use viz::{
+        handlers::serve, header::HeaderMap, types::RouteInfo, Body, Error, Handler,
+        Request, RequestExt, Response, ResponseExt, Result,
+    };
+
+    pub async fn file_and_error_handler(req: Request<Body>) -> Result<Response> {
+        let uri = req.uri().clone();
+        let headers = req.headers().clone();
+        let route_info = req.route_info().clone();
+        let options = &*req.state::<Arc<LeptosOptions>>().ok_or(
+            Error::Responder(Response::text("missing state type LeptosOptions")),
+        )?;
+        let root = &options.site_root;
+        let resp = get_static_file(uri, &root, headers, route_info).await?;
+        let status = resp.status();
+
+        if status.is_success() || status.is_redirection() {
+            Ok(resp)
+        } else {
+            let mut errors = Errors::default();
+            errors.insert_with_default_key(TodoAppError::NotFound);
+            let handler = leptos_viz::render_app_to_stream(
+                options.to_owned(),
+                move |cx| view! {cx, <ErrorTemplate outside_errors=errors.clone()/>},
+            );
+            handler(req).await
+        }
+    }
+
+    async fn get_static_file(
+        uri: Uri,
+        root: &str,
+        headers: HeaderMap,
+        route_info: Arc<RouteInfo>,
+    ) -> Result<Response> {
+        let mut req = Request::builder()
+            .uri(uri.clone())
+            .extension(route_info)
+            .body(Body::empty())
+            .unwrap();
+        *req.headers_mut() = headers;
+        // This path is relative to the cargo root
+        serve::Dir::new(root).call(req).await
+    }
+
+}
+}

examples/todo_app_sqlite_viz/src/lib.rs

@@ -0,0 +1,25 @@
+use cfg_if::cfg_if;
+use leptos::*;
+pub mod error_template;
+pub mod errors;
+pub mod fallback;
+pub mod todo;
+
+// Needs to be in lib.rs AFAIK because wasm-bindgen needs us to be compiling a lib. I may be wrong.
+cfg_if! {
+    if #[cfg(feature = "hydrate")] {
+        use wasm_bindgen::prelude::wasm_bindgen;
+        use crate::todo::*;
+
+        #[wasm_bindgen]
+        pub fn hydrate() {
+            console_error_panic_hook::set_once();
+            _ = console_log::init_with_level(log::Level::Debug);
+            console_error_panic_hook::set_once();
+
+            leptos::mount_to_body(|cx| {
+                view! { cx,  <TodoApp/> }
+            });
+        }
+    }
+}

examples/todo_app_sqlite_viz/src/main.rs

@@ -0,0 +1,80 @@
+use cfg_if::cfg_if;
+use leptos::*;
+// boilerplate to run in different modes
+cfg_if! {
+if #[cfg(feature = "ssr")] {
+    use crate::fallback::file_and_error_handler;
+    use crate::todo::*;
+    use leptos_viz::{generate_route_list, LeptosRoutes};
+    use std::sync::Arc;
+    use todo_app_sqlite_viz::*;
+    use viz::{
+        types::{State, StateError},
+        Request, RequestExt, Response, Result, Router, ServiceMaker,
+    };
+
+    //Define a handler to test extractor with state
+    async fn custom_handler(req: Request) -> Result<Response> {
+        let id = req.params::<String>()?;
+        let options = &*req
+            .state::<Arc<LeptosOptions>>()
+            .ok_or(StateError::new::<LeptosOptions>())?;
+        let handler = leptos_viz::render_app_to_stream_with_context(
+            options.clone(),
+            move |cx| {
+                provide_context(cx, id.clone());
+            },
+            |cx| view! { cx, <TodoApp/> },
+        );
+        handler(req).await
+    }
+
+    #[tokio::main]
+    async fn main() {
+        simple_logger::init_with_level(log::Level::Debug)
+            .expect("couldn't initialize logging");
+
+        let conn = db().await.expect("couldn't connect to DB");
+        /* sqlx::migrate!()
+        .run(&mut conn)
+        .await
+        .expect("could not run SQLx migrations"); */
+
+        crate::todo::register_server_functions();
+
+        // Setting this to None means we'll be using cargo-leptos and its env vars
+        let conf = get_configuration(None).await.unwrap();
+        let leptos_options = conf.leptos_options;
+        let addr = leptos_options.site_addr;
+        let routes = generate_route_list(|cx| view! { cx, <TodoApp/> }).await;
+
+        // build our application with a route
+        let app = Router::new()
+            .post("/api/:fn_name*", leptos_viz::handle_server_fns)
+            .get("/special/:id", custom_handler)
+            .leptos_routes(
+                leptos_options.clone(),
+                routes,
+                |cx| view! { cx, <TodoApp/> },
+            )
+            .get("/*", file_and_error_handler)
+            .with(State(Arc::new(leptos_options)));
+
+        // run our app with hyper
+        // `viz::Server` is a re-export of `hyper::Server`
+        log!("listening on http://{}", &addr);
+        viz::Server::bind(&addr)
+            .serve(ServiceMaker::from(app))
+            .await
+            .unwrap();
+    }
+}
+
+    // client-only stuff for Trunk
+    else {
+        pub fn main() {
+            // This example cannot be built as a trunk standalone CSR-only app.
+            // Only the server may directly connect to the database.
+        }
+    }
+}

examples/todo_app_sqlite_viz/src/todo.rs

@@ -0,0 +1,220 @@
+use crate::error_template::{ErrorTemplate, ErrorTemplateProps};
+use cfg_if::cfg_if;
+use leptos::*;
+use leptos_meta::*;
+use leptos_router::*;
+use serde::{Deserialize, Serialize};
+
+cfg_if! {
+    if #[cfg(feature = "ssr")] {
+        use sqlx::{Connection, SqliteConnection};
+        // use http::{header::SET_COOKIE, HeaderMap, HeaderValue, StatusCode};
+
+        pub async fn db() -> Result<SqliteConnection, ServerFnError> {
+            SqliteConnection::connect("sqlite:Todos.db").await.map_err(|e| ServerFnError::ServerError(e.to_string()))
+        }
+
+        pub fn register_server_functions() {
+            _ = GetTodos::register();
+            _ = AddTodo::register();
+            _ = DeleteTodo::register();
+        }
+
+        #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, sqlx::FromRow)]
+        pub struct Todo {
+            id: u16,
+            title: String,
+            completed: bool,
+        }
+    } else {
+        #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+        pub struct Todo {
+            id: u16,
+            title: String,
+            completed: bool,
+        }
+    }
+}
+
+#[server(GetTodos, "/api")]
+pub async fn get_todos(cx: Scope) -> Result<Vec<Todo>, ServerFnError> {
+    // this is just an example of how to access server context injected in the handlers
+    // http::Request doesn't implement Clone, so more work will be needed to do use_context() on this
+    let req_parts = use_context::<leptos_viz::RequestParts>(cx);
+
+    if let Some(req_parts) = req_parts {
+        println!("Uri = {:?}", req_parts.uri);
+    }
+
+    use futures::TryStreamExt;
+
+    let mut conn = db().await?;
+
+    let mut todos = Vec::new();
+    let mut rows = sqlx::query_as::<_, Todo>("SELECT * FROM todos").fetch(&mut conn);
+    while let Some(row) = rows
+        .try_next()
+        .await
+        .map_err(|e| ServerFnError::ServerError(e.to_string()))?
+    {
+        todos.push(row);
+    }
+
+    // Add a random header(because why not)
+    // let mut res_headers = HeaderMap::new();
+    // res_headers.insert(SET_COOKIE, HeaderValue::from_str("fizz=buzz").unwrap());
+
+    // let res_parts = leptos_viz::ResponseParts {
+    //     headers: res_headers,
+    //     status: Some(StatusCode::IM_A_TEAPOT),
+    // };
+
+    // let res_options_outer = use_context::<leptos_viz::ResponseOptions>(cx);
+    // if let Some(res_options) = res_options_outer {
+    //     res_options.overwrite(res_parts).await;
+    // }
+
+    Ok(todos)
+}
+
+#[server(AddTodo, "/api")]
+pub async fn add_todo(title: String) -> Result<(), ServerFnError> {
+    let mut conn = db().await?;
+
+    // fake API delay
+    std::thread::sleep(std::time::Duration::from_millis(1250));
+
+    match sqlx::query("INSERT INTO todos (title, completed) VALUES ($1, false)")
+        .bind(title)
+        .execute(&mut conn)
+        .await
+    {
+        Ok(_row) => Ok(()),
+        Err(e) => Err(ServerFnError::ServerError(e.to_string())),
+    }
+}
+
+#[server(DeleteTodo, "/api")]
+pub async fn delete_todo(id: u16) -> Result<(), ServerFnError> {
+    let mut conn = db().await?;
+
+    sqlx::query("DELETE FROM todos WHERE id = $1")
+        .bind(id)
+        .execute(&mut conn)
+        .await
+        .map(|_| ())
+        .map_err(|e| ServerFnError::ServerError(e.to_string()))
+}
+
+#[component]
+pub fn TodoApp(cx: Scope) -> impl IntoView {
+    //let id = use_context::<String>(cx);
+    provide_meta_context(cx);
+    view! {
+        cx,
+        <Link rel="shortcut icon" type_="image/ico" href="/favicon.ico"/>
+        <Stylesheet id="leptos" href="/pkg/todo_app_sqlite_viz.css"/>
+        <Router>
+            <header>
+                <h1>"My Tasks"</h1>
+            </header>
+            <main>
+                <Routes>
+                    <Route path="" view=|cx| view! {
+                        cx,
+                        <ErrorBoundary fallback=|cx, errors| view!{cx, <ErrorTemplate errors=errors/>}>
+                            <Todos/>
+                        </ErrorBoundary>
+                    }/> //Route
+                </Routes>
+            </main>
+        </Router>
+    }
+}
+
+#[component]
+pub fn Todos(cx: Scope) -> impl IntoView {
+    let add_todo = create_server_multi_action::<AddTodo>(cx);
+    let delete_todo = create_server_action::<DeleteTodo>(cx);
+    let submissions = add_todo.submissions();
+
+    // list of todos is loaded from the server in reaction to changes
+    let todos = create_resource(
+        cx,
+        move || (add_todo.version().get(), delete_todo.version().get()),
+        move |_| get_todos(cx),
+    );
+
+    view! {
+        cx,
+        <div>
+            <MultiActionForm action=add_todo>
+                <label>
+                    "Add a Todo"
+                    <input type="text" name="title"/>
+                </label>
+                <input type="submit" value="Add"/>
+            </MultiActionForm>
+            <Transition fallback=move || view! {cx, <p>"Loading..."</p> }>
+                {move || {
+                    let existing_todos = {
+                        move || {
+                            todos.read(cx)
+                                .map(move |todos| match todos {
+                                    Err(e) => {
+                                        vec![view! { cx, <pre class="error">"Server Error: " {e.to_string()}</pre>}.into_any()]
+                                    }
+                                    Ok(todos) => {
+                                        if todos.is_empty() {
+                                            vec![view! { cx, <p>"No tasks were found."</p> }.into_any()]
+                                        } else {
+                                            todos
+                                                .into_iter()
+                                                .map(move |todo| {
+                                                    view! {
+                                                        cx,
+                                                        <li>
+                                                            {todo.title}
+                                                            <ActionForm action=delete_todo>
+                                                                <input type="hidden" name="id" value={todo.id}/>
+                                                                <input type="submit" value="X"/>
+                                                            </ActionForm>
+                                                        </li>
+                                                    }
+                                                    .into_any()
+                                                })
+                                                .collect::<Vec<_>>()
+                                        }
+                                    }
+                                })
+                                .unwrap_or_default()
+                        }
+                    };
+
+                    let pending_todos = move || {
+                        submissions
+                        .get()
+                        .into_iter()
+                        .filter(|submission| submission.pending().get())
+                        .map(|submission| {
+                            view! {
+                                cx,
+                                <li class="pending">{move || submission.input.get().map(|data| data.title) }</li>
+                            }
+                        })
+                        .collect::<Vec<_>>()
+                    };
+
+                    view! {
+                        cx,
+                        <ul>
+                            {existing_todos}
+                            {pending_todos}
+                        </ul>
+                    }
+                }
+            }
+            </Transition>
+        </div>
+    }
+}

examples/todo_app_sqlite_viz/style.css

@@ -0,0 +1,3 @@
+.pending {
+	color: purple;
+}

examples/todomvc/Cargo.toml

@@ -11,7 +11,7 @@ console_error_panic_hook = "0.1.7"
 uuid = { version = "1", features = ["v4", "js", "serde"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-web-sys = { version = "0.3", features = ["Storage"] }
+web-sys = { version = "0.3.60", features = ["Storage"] }
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.0"

examples/todomvc/src/storage.rs

@@ -1,27 +1,33 @@
 use crate::Todo;
-use leptos::Scope;
-use serde::{Deserialize, Serialize};
+use leptos::{
+  signal_prelude::*,
+  Scope,
+};
+use serde::{
+  Deserialize,
+  Serialize,
+};
 use uuid::Uuid;
 
 #[derive(Serialize, Deserialize)]
 pub struct TodoSerialized {
-    pub id: Uuid,
-    pub title: String,
-    pub completed: bool,
+  pub id: Uuid,
+  pub title: String,
+  pub completed: bool,
 }
 
 impl TodoSerialized {
-    pub fn into_todo(self, cx: Scope) -> Todo {
-        Todo::new_with_completed(cx, self.id, self.title, self.completed)
-    }
+  pub fn into_todo(self, cx: Scope) -> Todo {
+    Todo::new_with_completed(cx, self.id, self.title, self.completed)
+  }
 }
 
 impl From<&Todo> for TodoSerialized {
-    fn from(todo: &Todo) -> Self {
-        Self {
-            id: todo.id,
-            title: todo.title.get(),
-            completed: todo.completed.get(),
-        }
+  fn from(todo: &Todo) -> Self {
+    Self {
+      id: todo.id,
+      title: todo.title.get(),
+      completed: todo.completed.get(),
     }
+  }
 }

integrations/actix/Cargo.toml

@@ -13,5 +13,6 @@ futures = "0.3"
 leptos = { workspace = true, features = ["ssr"] }
 leptos_meta = { workspace = true, features = ["ssr"] }
 leptos_router = { workspace = true, features = ["ssr"] }
+leptos_integration_utils = { workspace = true }
 parking_lot = "0.12.1"
 regex = "1.7.0"

integrations/actix/src/lib.rs

@@ -13,13 +13,14 @@ use actix_web::{
     web::Bytes,
     *,
 };
-use futures::{Future, StreamExt};
+use futures::{Future, Stream, StreamExt};
 use http::StatusCode;
 use leptos::{
     leptos_dom::ssr::render_to_stream_with_prefix_undisposed_with_context,
     leptos_server::{server_fn_by_path, Payload},
     *,
 };
+use leptos_integration_utils::{build_async_response, html_parts};
 use leptos_meta::*;
 use leptos_router::*;
 use parking_lot::RwLock;
@@ -274,13 +275,15 @@ pub fn handle_server_fns_with_context(
 }
 
 /// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
-/// to route it using [leptos_router], serving an HTML stream of your application.
+/// to route it using [leptos_router], serving an HTML stream of your application. The stream
+/// will include fallback content for any `<Suspense/>` nodes, and be immediately interactive,
+/// but requires some client-side JavaScript.
 ///
 /// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
 /// rendering it, and includes any meta tags injected using [leptos_meta].
 ///
-/// The HTML stream is rendered using [render_to_stream], and includes everything described in
-/// the documentation for that function.
+/// The HTML stream is rendered using [render_to_stream](leptos::ssr::render_to_stream), and
+/// includes everything described in the documentation for that function.
 ///
 /// This can then be set up at an appropriate route in your application:
 /// ```
@@ -335,6 +338,133 @@ where
     render_app_to_stream_with_context(options, |_cx| {}, app_fn)
 }
 
+/// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
+/// to route it using [leptos_router], serving an in-order HTML stream of your application.
+/// This stream will pause at each `<Suspense/>` node and wait for it to resolve befores
+/// sending down its HTML. The app will become interactive once it has fully loaded.
+///
+/// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
+/// rendering it, and includes any meta tags injected using [leptos_meta].
+///
+/// The HTML stream is rendered using [render_to_stream_in_order], and includes everything described in
+/// the documentation for that function.
+///
+/// This can then be set up at an appropriate route in your application:
+/// ```
+/// use actix_web::{App, HttpServer};
+/// use leptos::*;
+/// use std::{env, net::SocketAddr};
+///
+/// #[component]
+/// fn MyApp(cx: Scope) -> impl IntoView {
+///     view! { cx, <main>"Hello, world!"</main> }
+/// }
+///
+/// # if false { // don't actually try to run a server in a doctest...
+/// #[actix_web::main]
+/// async fn main() -> std::io::Result<()> {
+///     let conf = get_configuration(Some("Cargo.toml")).await.unwrap();
+///     let addr = conf.leptos_options.site_addr.clone();
+///     HttpServer::new(move || {
+///         let leptos_options = &conf.leptos_options;
+///
+///         App::new()
+///             // {tail:.*} passes the remainder of the URL as the route
+///             // the actual routing will be handled by `leptos_router`
+///             .route(
+///                 "/{tail:.*}",
+///                 leptos_actix::render_app_to_stream_in_order(
+///                     leptos_options.to_owned(),
+///                     |cx| view! { cx, <MyApp/> },
+///                 ),
+///             )
+///     })
+///     .bind(&addr)?
+///     .run()
+///     .await
+/// }
+/// # }
+/// ```
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [ResponseOptions]
+/// - [HttpRequest](actix_web::HttpRequest)
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_to_stream_in_order<IV>(
+    options: LeptosOptions,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + 'static,
+) -> Route
+where
+    IV: IntoView,
+{
+    render_app_to_stream_in_order_with_context(options, |_cx| {}, app_fn)
+}
+
+/// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
+/// to route it using [leptos_router], asynchronously rendering an HTML page after all
+/// `async` [Resource](leptos::Resource)s have loaded.
+///
+/// The provides a [MetaContext] and a [RouterIntegrationContext] to the app’s context before
+/// rendering it, and includes any meta tags injected using [leptos_meta].
+///
+/// The HTML stream is rendered using [render_to_string_async], and includes everything described in
+/// the documentation for that function.
+///
+/// This can then be set up at an appropriate route in your application:
+/// ```
+/// use actix_web::{App, HttpServer};
+/// use leptos::*;
+/// use std::{env, net::SocketAddr};
+///
+/// #[component]
+/// fn MyApp(cx: Scope) -> impl IntoView {
+///     view! { cx, <main>"Hello, world!"</main> }
+/// }
+///
+/// # if false { // don't actually try to run a server in a doctest...
+/// #[actix_web::main]
+/// async fn main() -> std::io::Result<()> {
+///     let conf = get_configuration(Some("Cargo.toml")).await.unwrap();
+///     let addr = conf.leptos_options.site_addr.clone();
+///     HttpServer::new(move || {
+///         let leptos_options = &conf.leptos_options;
+///
+///         App::new()
+///             // {tail:.*} passes the remainder of the URL as the route
+///             // the actual routing will be handled by `leptos_router`
+///             .route(
+///                 "/{tail:.*}",
+///                 leptos_actix::render_app_async(
+///                     leptos_options.to_owned(),
+///                     |cx| view! { cx, <MyApp/> },
+///                 ),
+///             )
+///     })
+///     .bind(&addr)?
+///     .run()
+///     .await
+/// }
+/// # }
+/// ```
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [ResponseOptions]
+/// - [HttpRequest](actix_web::HttpRequest)
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_async<IV>(
+    options: LeptosOptions,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + 'static,
+) -> Route
+where
+    IV: IntoView,
+{
+    render_app_async_with_context(options, |_cx| {}, app_fn)
+}
+
 /// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
 /// to route it using [leptos_router], serving an HTML stream of your application.
 ///
@@ -376,14 +506,104 @@ where
     })
 }
 
+/// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
+/// to route it using [leptos_router], serving an in-order HTML stream of your application.
+///
+/// This function allows you to provide additional information to Leptos for your route.
+/// It could be used to pass in Path Info, Connection Info, or anything your heart desires.
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [ResponseOptions]
+/// - [HttpRequest](actix_web::HttpRequest)
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_to_stream_in_order_with_context<IV>(
+    options: LeptosOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + 'static,
+) -> Route
+where
+    IV: IntoView,
+{
+    web::get().to(move |req: HttpRequest| {
+        let options = options.clone();
+        let app_fn = app_fn.clone();
+        let additional_context = additional_context.clone();
+        let res_options = ResponseOptions::default();
+
+        async move {
+            let app = {
+                let app_fn = app_fn.clone();
+                let res_options = res_options.clone();
+                move |cx| {
+                    provide_contexts(cx, &req, res_options);
+                    (app_fn)(cx).into_view(cx)
+                }
+            };
+
+            stream_app_in_order(&options, app, res_options, additional_context)
+                .await
+        }
+    })
+}
+
+/// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
+/// to route it using [leptos_router], asynchronously serving the page once all `async`
+/// [Resource](leptos::Resource)s have loaded.
+///
+/// This function allows you to provide additional information to Leptos for your route.
+/// It could be used to pass in Path Info, Connection Info, or anything your heart desires.
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [ResponseOptions]
+/// - [HttpRequest](actix_web::HttpRequest)
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_async_with_context<IV>(
+    options: LeptosOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + 'static,
+) -> Route
+where
+    IV: IntoView,
+{
+    web::get().to(move |req: HttpRequest| {
+        let options = options.clone();
+        let app_fn = app_fn.clone();
+        let additional_context = additional_context.clone();
+        let res_options = ResponseOptions::default();
+
+        async move {
+            let app = {
+                let app_fn = app_fn.clone();
+                let res_options = res_options.clone();
+                move |cx| {
+                    provide_contexts(cx, &req, res_options);
+                    (app_fn)(cx).into_view(cx)
+                }
+            };
+
+            render_app_async_helper(
+                &options,
+                app,
+                res_options,
+                additional_context,
+            )
+            .await
+        }
+    })
+}
+
 /// Returns an Actix [Route](actix_web::Route) that listens for a `GET` request and tries
 /// to route it using [leptos_router], serving an HTML stream of your application.
 ///
 /// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
 /// rendering it, and includes any meta tags injected using [leptos_meta].
 ///
-/// The HTML stream is rendered using [render_to_stream], and includes everything described in
-/// the documentation for that function.
+/// The HTML stream is rendered using [render_to_stream](leptos::ssr::render_to_stream), and
+/// includes everything described in the documentation for that function.
 ///
 /// This can then be set up at an appropriate route in your application:
 /// ```
@@ -434,6 +654,9 @@ where
 /// - [HttpRequest](actix_web::HttpRequest)
 /// - [MetaContext](leptos_meta::MetaContext)
 /// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+#[deprecated = "You can now use `render_app_async` with `create_resource` and \
+                `<Suspense/>` to achieve async rendering without manually \
+                preloading data."]
 pub fn render_preloaded_data_app<Data, Fut, IV>(
     options: LeptosOptions,
     data_fn: impl Fn(HttpRequest) -> Fut + Clone + 'static,
@@ -504,22 +727,39 @@ async fn stream_app(
 ) -> HttpResponse<BoxBody> {
     let (stream, runtime, scope) =
         render_to_stream_with_prefix_undisposed_with_context(
+            app,
+            move |cx| generate_head_metadata(cx).into(),
+            additional_context,
+        );
+
+    build_stream_response(options, res_options, stream, runtime, scope).await
+}
+
+async fn stream_app_in_order(
+    options: &LeptosOptions,
+    app: impl FnOnce(leptos::Scope) -> View + 'static,
+    res_options: ResponseOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+) -> HttpResponse<BoxBody> {
+    let (stream, runtime, scope) =
+        leptos::ssr::render_to_stream_in_order_with_prefix_undisposed_with_context(
             app,
             move |cx| {
-                let meta = use_context::<MetaContext>(cx);
-                let head = meta
-                    .as_ref()
-                    .map(|meta| meta.dehydrate())
-                    .unwrap_or_default();
-                let body_meta = meta
-                    .as_ref()
-                    .and_then(|meta| meta.body.as_string())
-                    .unwrap_or_default();
-                format!("{head}</head><body{body_meta}>").into()
+                generate_head_metadata(cx).into()
             },
             additional_context,
         );
 
+    build_stream_response(options, res_options, stream, runtime, scope).await
+}
+
+async fn build_stream_response(
+    options: &LeptosOptions,
+    res_options: ResponseOptions,
+    stream: impl Stream<Item = String> + 'static,
+    runtime: RuntimeId,
+    scope: ScopeId,
+) -> HttpResponse {
     let cx = leptos::Scope { runtime, id: scope };
     let (head, tail) =
         html_parts(options, use_context::<MetaContext>(cx).as_ref());
@@ -563,69 +803,40 @@ async fn stream_app(
     res
 }
 
-fn html_parts(
+async fn render_app_async_helper(
     options: &LeptosOptions,
-    meta_context: Option<&MetaContext>,
-) -> (String, String) {
-    // Because wasm-pack adds _bg to the end of the WASM filename, and we want to mantain compatibility with it's default options
-    // we add _bg to the wasm files if cargo-leptos doesn't set the env var LEPTOS_OUTPUT_NAME
-    // Otherwise we need to add _bg because wasm_pack always does. This is not the same as options.output_name, which is set regardless
-    let output_name = &options.output_name;
-    let mut wasm_output_name = output_name.clone();
-    if std::env::var("LEPTOS_OUTPUT_NAME").is_err() {
-        wasm_output_name.push_str("_bg");
+    app: impl FnOnce(leptos::Scope) -> View + 'static,
+    res_options: ResponseOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+) -> HttpResponse<BoxBody> {
+    let (stream, runtime, scope) =
+        leptos::ssr::render_to_stream_in_order_with_prefix_undisposed_with_context(
+            app,
+            move |_| "".into(),
+            additional_context,
+        );
+
+    let html = build_async_response(stream, options, runtime, scope).await;
+
+    let res_options = res_options.0.read();
+
+    let (status, mut headers) =
+        (res_options.status, res_options.headers.clone());
+    let status = status.unwrap_or_default();
+
+    let mut res = HttpResponse::Ok().content_type("text/html").body(html);
+
+    // Add headers manipulated in the response
+    for (key, value) in headers.drain() {
+        if let Some(key) = key {
+            res.headers_mut().append(key, value);
+        }
     }
-
-    let site_ip = &options.site_addr.ip().to_string();
-    let reload_port = options.reload_port;
-    let pkg_path = &options.site_pkg_dir;
-
-    let leptos_autoreload = match std::env::var("LEPTOS_WATCH").is_ok() {
-        true => format!(
-            r#"
-            <script crossorigin="">(function () {{
-                var ws = new WebSocket('ws://{site_ip}:{reload_port}/live_reload');
-                ws.onmessage = (ev) => {{
-                    let msg = JSON.parse(ev.data);
-                    if (msg.all) window.location.reload();
-                    if (msg.css) {{
-                        let found = false;
-                        document.querySelectorAll("link").forEach((link) => {{
-                            if (link.getAttribute('href').includes(msg.css)) {{
-                                let newHref = '/' + msg.css + '?version=' + new Date().getMilliseconds();
-                                link.setAttribute('href', newHref);
-                                found = true;
-                            }}
-                        }});
-                        if (!found) console.warn(`CSS hot-reload: Could not find a <link href=/\"${{msg.css}}\"> element`);
-                    }};
-                }};
-                ws.onclose = () => console.warn('Live-reload stopped. Manual reload necessary.');
-            }})()
-            </script>
-            "#
-        ),
-        false => "".to_string(),
-    };
-
-    let html_metadata = meta_context
-        .and_then(|mc| mc.html.as_string())
-        .unwrap_or_default();
-    let head = format!(
-        r#"<!DOCTYPE html>
-        <html{html_metadata}>
-            <head>
-                <meta charset="utf-8"/>
-                <meta name="viewport" content="width=device-width, initial-scale=1"/>
-                <link rel="modulepreload" href="/{pkg_path}/{output_name}.js">
-                <link rel="preload" href="/{pkg_path}/{wasm_output_name}.wasm" as="fetch" type="application/wasm" crossorigin="">
-                <script type="module">import init, {{ hydrate }} from '/{pkg_path}/{output_name}.js'; init('/{pkg_path}/{wasm_output_name}.wasm').then(hydrate);</script>
-                {leptos_autoreload}
-                "#
-    );
-    let tail = "</body></html>".to_string();
-
-    (head, tail)
+    // Set status to what is returned in the function
+    let res_status = res.status_mut();
+    *res_status = status;
+    // Return the response
+    res
 }
 
 /// Generates a list of all routes defined in Leptos's Router in your app. We can then use this to automatically
@@ -633,7 +844,7 @@ fn html_parts(
 /// as an argument so it can walk you app tree. This version is tailored to generated Actix compatible paths.
 pub fn generate_route_list<IV>(
     app_fn: impl FnOnce(leptos::Scope) -> IV + 'static,
-) -> Vec<String>
+) -> Vec<(String, SsrMode)>
 where
     IV: IntoView + 'static,
 {
@@ -641,12 +852,12 @@ where
 
     // Empty strings screw with Actix pathing, they need to be "/"
     routes = routes
-        .iter()
-        .map(|s| {
+        .into_iter()
+        .map(|(s, mode)| {
             if s.is_empty() {
-                return "/".to_string();
+                return ("/".to_string(), mode);
             }
-            s.to_string()
+            (s, mode)
         })
         .collect();
 
@@ -656,14 +867,14 @@ where
     // Match `:some_word` but only capture `some_word` in the groups to replace with `{some_word}`
     let capture_re = Regex::new(r":((?:[^.,/]+)+)[^/]?").unwrap();
 
-    let routes: Vec<String> = routes
-        .iter()
-        .map(|s| wildcard_re.replace_all(s, "{tail:.*}").to_string())
-        .map(|s| capture_re.replace_all(&s, "{$1}").to_string())
+    let routes: Vec<(String, SsrMode)> = routes
+        .into_iter()
+        .map(|(s, m)| (wildcard_re.replace_all(&s, "{tail:.*}").to_string(), m))
+        .map(|(s, m)| (capture_re.replace_all(&s, "{$1}").to_string(), m))
         .collect();
 
     if routes.is_empty() {
-        vec!["/".to_string()]
+        vec![("/".to_string(), Default::default())]
     } else {
         routes
     }
@@ -674,18 +885,22 @@ pub enum DataResponse<T> {
     Response(actix_web::dev::Response<BoxBody>),
 }
 
-/// This trait allows one to pass a list of routes and a render function to Axum's router, letting us avoid
+/// This trait allows one to pass a list of routes and a render function to Actix's router, letting us avoid
 /// having to use wildcards or manually define all routes in multiple places.
 pub trait LeptosRoutes {
     fn leptos_routes<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
     where
         IV: IntoView + 'static;
 
+    #[deprecated = "You can now use `leptos_routes` and a `<Route \
+                    mode=SsrMode::Async/>`
+                    to achieve async rendering without manually preloading \
+                    data."]
     fn leptos_preloaded_data_routes<Data, Fut, IV>(
         self,
         options: LeptosOptions,
@@ -701,7 +916,7 @@ pub trait LeptosRoutes {
     fn leptos_routes_with_context<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
@@ -723,20 +938,13 @@ where
     fn leptos_routes<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
     where
         IV: IntoView + 'static,
     {
-        let mut router = self;
-        for path in paths.iter() {
-            router = router.route(
-                path,
-                render_app_to_stream(options.clone(), app_fn.clone()),
-            );
-        }
-        router
+        self.leptos_routes_with_context(options, paths, |_| {}, app_fn)
     }
 
     fn leptos_preloaded_data_routes<Data, Fut, IV>(
@@ -756,6 +964,7 @@ where
         for path in paths.iter() {
             router = router.route(
                 path,
+                #[allow(deprecated)]
                 render_preloaded_data_app(
                     options.clone(),
                     data_fn.clone(),
@@ -769,7 +978,7 @@ where
     fn leptos_routes_with_context<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
@@ -777,14 +986,28 @@ where
         IV: IntoView + 'static,
     {
         let mut router = self;
-        for path in paths.iter() {
+        for (path, mode) in paths.iter() {
             router = router.route(
                 path,
-                render_app_to_stream_with_context(
-                    options.clone(),
-                    additional_context.clone(),
-                    app_fn.clone(),
-                ),
+                match mode {
+                    SsrMode::OutOfOrder => render_app_to_stream_with_context(
+                        options.clone(),
+                        additional_context.clone(),
+                        app_fn.clone(),
+                    ),
+                    SsrMode::InOrder => {
+                        render_app_to_stream_in_order_with_context(
+                            options.clone(),
+                            additional_context.clone(),
+                            app_fn.clone(),
+                        )
+                    }
+                    SsrMode::Async => render_app_async_with_context(
+                        options.clone(),
+                        additional_context.clone(),
+                        app_fn.clone(),
+                    ),
+                },
             );
         }
         router

integrations/axum/Cargo.toml

@@ -16,5 +16,6 @@ leptos = { workspace = true, features = ["ssr"] }
 leptos_meta = { workspace = true, features = ["ssr"] }
 leptos_router = { workspace = true, features = ["ssr"] }
 leptos_config = { workspace = true }
+leptos_integration_utils = { workspace = true }
 tokio = { version = "1", features = ["full"] }
 parking_lot = "0.12.1"

integrations/axum/src/lib.rs

@@ -16,14 +16,19 @@ use axum::{
     response::IntoResponse,
     routing::get,
 };
-use futures::{Future, SinkExt, Stream, StreamExt};
+use futures::{
+    channel::mpsc::{Receiver, Sender},
+    Future, SinkExt, Stream, StreamExt,
+};
 use http::{header, method::Method, uri::Uri, version::Version, Response};
 use hyper::body;
 use leptos::{
     leptos_server::{server_fn_by_path, Payload},
+    ssr::*,
     *,
 };
-use leptos_meta::MetaContext;
+use leptos_integration_utils::{build_async_response, html_parts};
+use leptos_meta::{generate_head_metadata, MetaContext};
 use leptos_router::*;
 use parking_lot::RwLock;
 use std::{io, pin::Pin, sync::Arc};
@@ -246,11 +251,6 @@ async fn handle_server_fns_inner(
                                         res_options_inner.headers.clone(),
                                     );
 
-                                    if let Some(header_ref) = res.headers_mut()
-                                    {
-                                        header_ref.extend(res_headers.drain());
-                                    };
-
                                     if accept_header == Some("application/json")
                                         || accept_header
                                             == Some(
@@ -280,6 +280,12 @@ async fn handle_server_fns_inner(
                                         Some(status) => res.status(status),
                                         None => res,
                                     };
+                                    // This must be after the default referrer
+                                    // redirect so that it overwrites the one above
+                                    if let Some(header_ref) = res.headers_mut()
+                                    {
+                                        header_ref.extend(res_headers.drain());
+                                    };
                                     match serialized {
                                         Payload::Binary(data) => res
                                             .header(
@@ -337,8 +343,8 @@ pub type PinnedHtmlStream =
 /// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
 /// rendering it, and includes any meta tags injected using [leptos_meta].
 ///
-/// The HTML stream is rendered using [render_to_stream], and includes everything described in
-/// the documentation for that function.
+/// The HTML stream is rendered using [render_to_stream](leptos::ssr::render_to_stream), and
+/// includes everything described in the documentation for that function.
 ///
 /// This can then be set up at an appropriate route in your application:
 /// ```
@@ -401,6 +407,79 @@ where
     render_app_to_stream_with_context(options, |_| {}, app_fn)
 }
 
+/// Returns an Axum [Handler](axum::handler::Handler) that listens for a `GET` request and tries
+/// to route it using [leptos_router], serving an in-order HTML stream of your application.
+/// This stream will pause at each `<Suspense/>` node and wait for it to resolve befores
+/// sending down its HTML. The app will become interactive once it has fully loaded.
+///
+/// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
+/// rendering it, and includes any meta tags injected using [leptos_meta].
+///
+/// The HTML stream is rendered using [render_to_stream_in_order], and includes everything described in
+/// the documentation for that function.
+///
+/// This can then be set up at an appropriate route in your application:
+/// ```
+/// use axum::{handler::Handler, Router};
+/// use leptos::*;
+/// use leptos_config::get_configuration;
+/// use std::{env, net::SocketAddr};
+///
+/// #[component]
+/// fn MyApp(cx: Scope) -> impl IntoView {
+///     view! { cx, <main>"Hello, world!"</main> }
+/// }
+///
+/// # if false { // don't actually try to run a server in a doctest...
+/// #[tokio::main]
+/// async fn main() {
+///     let conf = get_configuration(Some("Cargo.toml")).await.unwrap();
+///     let leptos_options = conf.leptos_options;
+///     let addr = leptos_options.site_addr.clone();
+///
+///     // build our application with a route
+///     let app =
+///         Router::new().fallback(leptos_axum::render_app_to_stream_in_order(
+///             leptos_options,
+///             |cx| view! { cx, <MyApp/> },
+///         ));
+///
+///     // run our app with hyper
+///     // `axum::Server` is a re-export of `hyper::Server`
+///     axum::Server::bind(&addr)
+///         .serve(app.into_make_service())
+///         .await
+///         .unwrap();
+/// }
+/// # }
+/// ```
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [RequestParts]
+/// - [ResponseOptions]
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_to_stream_in_order<IV>(
+    options: LeptosOptions,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
+) -> impl Fn(
+    Request<Body>,
+) -> Pin<
+    Box<
+        dyn Future<Output = Response<StreamBody<PinnedHtmlStream>>>
+            + Send
+            + 'static,
+    >,
+> + Clone
+       + Send
+       + 'static
+where
+    IV: IntoView,
+{
+    render_app_to_stream_in_order_with_context(options, |_| {}, app_fn)
+}
+
 /// Returns an Axum [Handler](axum::handler::Handler) that listens for a `GET` request and tries
 /// to route it using [leptos_router], serving an HTML stream of your application.
 ///
@@ -461,7 +540,7 @@ where
 
                 let full_path = format!("http://leptos.dev{path}");
 
-                let (mut tx, rx) = futures::channel::mpsc::channel(8);
+                let (tx, rx) = futures::channel::mpsc::channel(8);
 
                 spawn_blocking({
                     let app_fn = app_fn.clone();
@@ -479,17 +558,7 @@ where
                                                 let full_path = full_path.clone();
                                                 let req_parts = generate_request_parts(req).await;
                                                 move |cx| {
-                                                    let integration = ServerIntegration {
-                                                        path: full_path.clone(),
-                                                    };
-                                                    provide_context(
-                                                        cx,
-                                                        RouterIntegrationContext::new(integration),
-                                                    );
-                                                    provide_context(cx, MetaContext::new());
-                                                    provide_context(cx, req_parts);
-                                                    provide_context(cx, default_res_options);
-                                                    provide_server_redirect(cx, move |path| redirect(cx, path));
+                                                    provide_contexts(cx, full_path, req_parts, default_res_options);
                                                     app_fn(cx).into_view(cx)
                                                 }
                                             };
@@ -497,37 +566,11 @@ where
                                             let (bundle, runtime, scope) =
                                                 leptos::leptos_dom::ssr::render_to_stream_with_prefix_undisposed_with_context(
                                                     app,
-                                                    |cx| {
-                                                        let head = use_context::<MetaContext>(cx)
-                                                            .map(|meta| meta.dehydrate())
-                                                            .unwrap_or_default();
-                                                        format!("{head}</head><body>").into()
-                                                    },
+                                                    |cx| generate_head_metadata(cx).into(),
                                                     add_context,
                                                 );
 
-                                            let cx = Scope { runtime, id: scope };
-                                            let (head, tail) = html_parts(&options, use_context::<MetaContext>(cx).as_ref());
-
-                                            _ = tx.send(head).await;
-                                            let mut shell = Box::pin(bundle);
-                                            while let Some(fragment) = shell.next().await {
-                                                _ = tx.send(fragment).await;
-                                            }
-                                            _ = tx.send(tail.to_string()).await;
-
-                                            // Extract the value of ResponseOptions from here
-                                            let res_options =
-                                                use_context::<ResponseOptions>(cx).unwrap();
-
-                                            let new_res_parts = res_options.0.read().clone();
-
-                                            let mut writable = res_options2.0.write();
-                                            *writable = new_res_parts;
-
-                                            runtime.dispose();
-
-                                            tx.close_channel();
+                                                forward_stream(&options, res_options2, bundle, runtime, scope, tx).await;
                                         })
                                         .await;
                                 }
@@ -535,26 +578,372 @@ where
                     }
                 });
 
-                let mut stream = Box::pin(rx.map(|html| Ok(Bytes::from(html))));
+                generate_response(res_options3, rx).await
+            }
+        })
+    }
+}
 
-                // Get the first and second chunks in the stream, which renders the app shell, and thus allows Resources to run
-                let first_chunk = stream.next().await;
-                let second_chunk = stream.next().await;
+async fn generate_response(
+    res_options: ResponseOptions,
+    rx: Receiver<String>,
+) -> Response<StreamBody<PinnedHtmlStream>> {
+    let mut stream = Box::pin(rx.map(|html| Ok(Bytes::from(html))));
+
+    // Get the first and second chunks in the stream, which renders the app shell, and thus allows Resources to run
+    let first_chunk = stream.next().await;
+    let second_chunk = stream.next().await;
+
+    // Extract the resources now that they've been rendered
+    let res_options = res_options.0.read();
+
+    let complete_stream =
+        futures::stream::iter([first_chunk.unwrap(), second_chunk.unwrap()])
+            .chain(stream);
+
+    let mut res = Response::new(StreamBody::new(
+        Box::pin(complete_stream) as PinnedHtmlStream
+    ));
+
+    if let Some(status) = res_options.status {
+        *res.status_mut() = status
+    }
+    let mut res_headers = res_options.headers.clone();
+    res.headers_mut().extend(res_headers.drain());
+
+    res
+}
+
+async fn forward_stream(
+    options: &LeptosOptions,
+    res_options2: ResponseOptions,
+    bundle: impl Stream<Item = String> + 'static,
+    runtime: RuntimeId,
+    scope: ScopeId,
+    mut tx: Sender<String>,
+) {
+    let cx = Scope { runtime, id: scope };
+    let (head, tail) =
+        html_parts(options, use_context::<MetaContext>(cx).as_ref());
+
+    _ = tx.send(head).await;
+    let mut shell = Box::pin(bundle);
+    while let Some(fragment) = shell.next().await {
+        _ = tx.send(fragment).await;
+    }
+    _ = tx.send(tail.to_string()).await;
+
+    // Extract the value of ResponseOptions from here
+    let res_options = use_context::<ResponseOptions>(cx).unwrap();
+
+    let new_res_parts = res_options.0.read().clone();
+
+    let mut writable = res_options2.0.write();
+    *writable = new_res_parts;
+
+    runtime.dispose();
+
+    tx.close_channel();
+}
+
+/// Returns an Axum [Handler](axum::handler::Handler) that listens for a `GET` request and tries
+/// to route it using [leptos_router], serving an in-order HTML stream of your application.
+/// This stream will pause at each `<Suspense/>` node and wait for it to resolve befores
+/// sending down its HTML. The app will become interactive once it has fully loaded.
+///
+/// This version allows us to pass Axum State/Extension/Extractor or other infro from Axum or network
+/// layers above Leptos itself. To use it, you'll need to write your own handler function that provides
+/// the data to leptos in a closure. An example is below
+/// ```ignore
+/// async fn custom_handler(Path(id): Path<String>, Extension(options): Extension<Arc<LeptosOptions>>, req: Request<Body>) -> Response{
+///     let handler = leptos_axum::render_app_to_stream_in_order_with_context((*options).clone(),
+///     move |cx| {
+///         provide_context(cx, id.clone());
+///     },
+///     |cx| view! { cx, <TodoApp/> }
+/// );
+///     handler(req).await.into_response()
+/// }
+/// ```
+/// Otherwise, this function is identical to [render_app_to_stream].
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [RequestParts]
+/// - [ResponseOptions]
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_to_stream_in_order_with_context<IV>(
+    options: LeptosOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
+) -> impl Fn(
+    Request<Body>,
+) -> Pin<
+    Box<
+        dyn Future<Output = Response<StreamBody<PinnedHtmlStream>>>
+            + Send
+            + 'static,
+    >,
+> + Clone
+       + Send
+       + 'static
+where
+    IV: IntoView,
+{
+    move |req: Request<Body>| {
+        Box::pin({
+            let options = options.clone();
+            let app_fn = app_fn.clone();
+            let add_context = additional_context.clone();
+            let default_res_options = ResponseOptions::default();
+            let res_options2 = default_res_options.clone();
+            let res_options3 = default_res_options.clone();
+
+            async move {
+                // Need to get the path and query string of the Request
+                // For reasons that escape me, if the incoming URI protocol is https, it provides the absolute URI
+                // if http, it returns a relative path. Adding .path() seems to make it explicitly return the relative uri
+                let path = req.uri().path_and_query().unwrap().as_str();
+
+                let full_path = format!("http://leptos.dev{path}");
+
+                let (tx, rx) = futures::channel::mpsc::channel(8);
+
+                spawn_blocking({
+                    let app_fn = app_fn.clone();
+                    let add_context = add_context.clone();
+                    move || {
+                        tokio::runtime::Runtime::new()
+                            .expect("couldn't spawn runtime")
+                            .block_on({
+                                let app_fn = app_fn.clone();
+                                let add_context = add_context.clone();
+                                async move {
+                                    tokio::task::LocalSet::new()
+                                        .run_until(async {
+                                            let app = {
+                                                let full_path = full_path.clone();
+                                                let req_parts = generate_request_parts(req).await;
+                                                move |cx| {
+                                                    provide_contexts(cx, full_path, req_parts, default_res_options);
+                                                    app_fn(cx).into_view(cx)
+                                                }
+                                            };
+
+                                            let (bundle, runtime, scope) =
+                                                leptos::ssr::render_to_stream_in_order_with_prefix_undisposed_with_context(
+                                                    app,
+                                                    |cx| generate_head_metadata(cx).into(),
+                                                    add_context,
+                                                );
+
+                                            forward_stream(&options, res_options2, bundle, runtime, scope, tx).await;
+                                        })
+                                        .await;
+                                }
+                            });
+                    }
+                });
+
+                generate_response(res_options3, rx).await
+            }
+        })
+    }
+}
+
+fn provide_contexts(
+    cx: Scope,
+    path: String,
+    req_parts: RequestParts,
+    default_res_options: ResponseOptions,
+) {
+    let integration = ServerIntegration { path };
+    provide_context(cx, RouterIntegrationContext::new(integration));
+    provide_context(cx, MetaContext::new());
+    provide_context(cx, req_parts);
+    provide_context(cx, default_res_options);
+    provide_server_redirect(cx, move |path| redirect(cx, path));
+}
+
+/// Returns an Axum [Handler](axum::handler::Handler) that listens for a `GET` request and tries
+/// to route it using [leptos_router], asynchronously rendering an HTML page after all
+/// `async` [Resource](leptos::Resource)s have loaded.
+///
+/// The provides a [MetaContext] and a [RouterIntegrationContext] to app’s context before
+/// rendering it, and includes any meta tags injected using [leptos_meta].
+///
+/// The HTML stream is rendered using [render_to_string_async], and includes everything described in
+/// the documentation for that function.
+///
+/// This can then be set up at an appropriate route in your application:
+/// ```
+/// use axum::{handler::Handler, Router};
+/// use leptos::*;
+/// use leptos_config::get_configuration;
+/// use std::{env, net::SocketAddr};
+///
+/// #[component]
+/// fn MyApp(cx: Scope) -> impl IntoView {
+///     view! { cx, <main>"Hello, world!"</main> }
+/// }
+///
+/// # if false { // don't actually try to run a server in a doctest...
+/// #[tokio::main]
+/// async fn main() {
+///     let conf = get_configuration(Some("Cargo.toml")).await.unwrap();
+///     let leptos_options = conf.leptos_options;
+///     let addr = leptos_options.site_addr.clone();
+///
+///     // build our application with a route
+///     let app = Router::new().fallback(leptos_axum::render_app_async(
+///         leptos_options,
+///         |cx| view! { cx, <MyApp/> },
+///     ));
+///
+///     // run our app with hyper
+///     // `axum::Server` is a re-export of `hyper::Server`
+///     axum::Server::bind(&addr)
+///         .serve(app.into_make_service())
+///         .await
+///         .unwrap();
+/// }
+/// # }
+/// ```
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [RequestParts]
+/// - [ResponseOptions]
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_async<IV>(
+    options: LeptosOptions,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
+) -> impl Fn(
+    Request<Body>,
+) -> Pin<Box<dyn Future<Output = Response<String>> + Send + 'static>>
+       + Clone
+       + Send
+       + 'static
+where
+    IV: IntoView,
+{
+    render_app_async_with_context(options, |_| {}, app_fn)
+}
+
+/// Returns an Axum [Handler](axum::handler::Handler) that listens for a `GET` request and tries
+/// to route it using [leptos_router], asynchronously rendering an HTML page after all
+/// `async` [Resource](leptos::Resource)s have loaded.
+///
+/// This version allows us to pass Axum State/Extension/Extractor or other infro from Axum or network
+/// layers above Leptos itself. To use it, you'll need to write your own handler function that provides
+/// the data to leptos in a closure. An example is below
+/// ```ignore
+/// async fn custom_handler(Path(id): Path<String>, Extension(options): Extension<Arc<LeptosOptions>>, req: Request<Body>) -> Response{
+///     let handler = leptos_axum::render_app_async_with_context((*options).clone(),
+///     move |cx| {
+///         provide_context(cx, id.clone());
+///     },
+///     |cx| view! { cx, <TodoApp/> }
+/// );
+///     handler(req).await.into_response()
+/// }
+/// ```
+/// Otherwise, this function is identical to [render_app_to_stream].
+///
+/// ## Provided Context Types
+/// This function always provides context values including the following types:
+/// - [RequestParts]
+/// - [ResponseOptions]
+/// - [MetaContext](leptos_meta::MetaContext)
+/// - [RouterIntegrationContext](leptos_router::RouterIntegrationContext)
+pub fn render_app_async_with_context<IV>(
+    options: LeptosOptions,
+    additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
+    app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
+) -> impl Fn(
+    Request<Body>,
+) -> Pin<Box<dyn Future<Output = Response<String>> + Send + 'static>>
+       + Clone
+       + Send
+       + 'static
+where
+    IV: IntoView,
+{
+    move |req: Request<Body>| {
+        Box::pin({
+            let options = options.clone();
+            let app_fn = app_fn.clone();
+            let add_context = additional_context.clone();
+            let default_res_options = ResponseOptions::default();
+            let res_options2 = default_res_options.clone();
+            let res_options3 = default_res_options.clone();
+
+            async move {
+                // Need to get the path and query string of the Request
+                // For reasons that escape me, if the incoming URI protocol is https, it provides the absolute URI
+                // if http, it returns a relative path. Adding .path() seems to make it explicitly return the relative uri
+                let path = req.uri().path_and_query().unwrap().as_str();
+
+                let full_path = format!("http://leptos.dev{path}");
+
+                let (tx, rx) = futures::channel::oneshot::channel();
+
+                spawn_blocking({
+                    let app_fn = app_fn.clone();
+                    let add_context = add_context.clone();
+                    move || {
+                        tokio::runtime::Runtime::new()
+                            .expect("couldn't spawn runtime")
+                            .block_on({
+                                let app_fn = app_fn.clone();
+                                let add_context = add_context.clone();
+                                async move {
+                                    tokio::task::LocalSet::new()
+                                        .run_until(async {
+                                            let app = {
+                                                let full_path = full_path.clone();
+                                                let req_parts = generate_request_parts(req).await;
+                                                move |cx| {
+                                                    provide_contexts(cx, full_path, req_parts, default_res_options);
+                                                    app_fn(cx).into_view(cx)
+                                                }
+                                            };
+
+                                            let (stream, runtime, scope) =
+                                                render_to_stream_in_order_with_prefix_undisposed_with_context(
+                                                    app,
+                                                    |_| "".into(),
+                                                    add_context,
+                                                );
+
+                                            // Extract the value of ResponseOptions from here
+                                            let cx = leptos::Scope { runtime, id: scope };
+                                            let res_options =
+                                                use_context::<ResponseOptions>(cx).unwrap();
+
+                                            let html = build_async_response(stream, &options, runtime, scope).await;
+
+                                            let new_res_parts = res_options.0.read().clone();
+
+                                            let mut writable = res_options2.0.write();
+                                            *writable = new_res_parts;
+
+                                            _ = tx.send(html);
+                                        })
+                                        .await;
+                                }
+                            });
+                    }
+                });
+
+                let html = rx.await.expect("to complete HTML rendering");
+
+                let mut res = Response::new(html);
 
-                // Extract the resources now that they've been rendered
                 let res_options = res_options3.0.read();
 
-                let complete_stream = futures::stream::iter([
-                    first_chunk.unwrap(),
-                    second_chunk.unwrap(),
-                ])
-                .chain(stream);
-
-                let mut res = Response::new(StreamBody::new(Box::pin(
-                    complete_stream,
-                )
-                    as PinnedHtmlStream));
-
                 if let Some(status) = res_options.status {
                     *res.status_mut() = status
                 }
@@ -567,81 +956,17 @@ where
     }
 }
 
-fn html_parts(
-    options: &LeptosOptions,
-    meta: Option<&MetaContext>,
-) -> (String, &'static str) {
-    let pkg_path = &options.site_pkg_dir;
-    let output_name = &options.output_name;
-
-    // Because wasm-pack adds _bg to the end of the WASM filename, and we want to mantain compatibility with it's default options
-    // we add _bg to the wasm files if cargo-leptos doesn't set the env var LEPTOS_OUTPUT_NAME
-    // Otherwise we need to add _bg because wasm_pack always does. This is not the same as options.output_name, which is set regardless
-    let mut wasm_output_name = output_name.clone();
-    if std::env::var("LEPTOS_OUTPUT_NAME").is_err() {
-        wasm_output_name.push_str("_bg");
-    }
-
-    let site_ip = &options.site_addr.ip().to_string();
-    let reload_port = options.reload_port;
-
-    let leptos_autoreload = match std::env::var("LEPTOS_WATCH").is_ok() {
-        true => format!(
-            r#"
-                <script crossorigin="">(function () {{
-                    var ws = new WebSocket('ws://{site_ip}:{reload_port}/live_reload');
-                    ws.onmessage = (ev) => {{
-                        let msg = JSON.parse(ev.data);
-                        if (msg.all) window.location.reload();
-                        if (msg.css) {{
-                            let found = false;
-                            document.querySelectorAll("link").forEach((link) => {{
-                                if (link.getAttribute('href').includes(msg.css)) {{
-                                    let newHref = '/' + href + '?version=' + new Date().getMilliseconds();
-                                    link.setAttribute('href', newHref);
-                                    found = true;
-                                }}
-                            }});
-                            if (!found) console.warn(`CSS hot-reload: Could not find a <link href=/\"${{msg.css}}\"> element`);
-                        }};
-                    }};
-                    ws.onclose = () => console.warn('Live-reload stopped. Manual reload necessary.');
-                }})()
-                </script>
-                "#
-        ),
-        false => "".to_string(),
-    };
-
-    let html_metadata =
-        meta.and_then(|mc| mc.html.as_string()).unwrap_or_default();
-    let head = format!(
-        r#"<!DOCTYPE html>
-            <html{html_metadata}>
-                <head>
-                    <meta charset="utf-8"/>
-                    <meta name="viewport" content="width=device-width, initial-scale=1"/>
-                    <link rel="modulepreload" href="/{pkg_path}/{output_name}.js">
-                    <link rel="preload" href="/{pkg_path}/{wasm_output_name}.wasm" as="fetch" type="application/wasm" crossorigin="">
-                    <script type="module">import init, {{ hydrate }} from '/{pkg_path}/{output_name}.js'; init('/{pkg_path}/{wasm_output_name}.wasm').then(hydrate);</script>
-                    {leptos_autoreload}
-                    "#
-    );
-    let tail = "</body></html>";
-    (head, tail)
-}
-
 /// Generates a list of all routes defined in Leptos's Router in your app. We can then use this to automatically
 /// create routes in Axum's Router without having to use wildcard matching or fallbacks. Takes in your root app Element
 /// as an argument so it can walk you app tree. This version is tailored to generate Axum compatible paths.
 pub async fn generate_route_list<IV>(
     app_fn: impl FnOnce(Scope) -> IV + 'static,
-) -> Vec<String>
+) -> Vec<(String, SsrMode)>
 where
     IV: IntoView + 'static,
 {
     #[derive(Default, Clone, Debug)]
-    pub struct Routes(pub Arc<RwLock<Vec<String>>>);
+    pub struct Routes(pub Arc<RwLock<Vec<(String, SsrMode)>>>);
 
     let routes = Routes::default();
     let routes_inner = routes.clone();
@@ -663,13 +988,19 @@ where
 
     let routes = routes.0.read().to_owned();
     // Axum's Router defines Root routes as "/" not ""
-    let routes: Vec<String> = routes
+    let routes = routes
         .into_iter()
-        .map(|s| if s.is_empty() { "/".to_string() } else { s })
-        .collect();
+        .map(|(s, m)| {
+            if s.is_empty() {
+                ("/".to_string(), m)
+            } else {
+                (s, m)
+            }
+        })
+        .collect::<Vec<_>>();
 
     if routes.is_empty() {
-        vec!["/".to_string()]
+        vec![("/".to_string(), Default::default())]
     } else {
         routes
     }
@@ -681,7 +1012,7 @@ pub trait LeptosRoutes {
     fn leptos_routes<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
     where
@@ -690,7 +1021,7 @@ pub trait LeptosRoutes {
     fn leptos_routes_with_context<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
@@ -699,7 +1030,7 @@ pub trait LeptosRoutes {
 
     fn leptos_routes_with_handler<H, T>(
         self,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         handler: H,
     ) -> Self
     where
@@ -712,26 +1043,19 @@ impl LeptosRoutes for axum::Router {
     fn leptos_routes<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
     where
         IV: IntoView + 'static,
     {
-        let mut router = self;
-        for path in paths.iter() {
-            router = router.route(
-                path,
-                get(render_app_to_stream(options.clone(), app_fn.clone())),
-            );
-        }
-        router
+        self.leptos_routes_with_context(options, paths, |_| {}, app_fn)
     }
 
     fn leptos_routes_with_context<IV>(
         self,
         options: LeptosOptions,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         additional_context: impl Fn(leptos::Scope) + 'static + Clone + Send,
         app_fn: impl Fn(leptos::Scope) -> IV + Clone + Send + 'static,
     ) -> Self
@@ -739,14 +1063,30 @@ impl LeptosRoutes for axum::Router {
         IV: IntoView + 'static,
     {
         let mut router = self;
-        for path in paths.iter() {
+        for (path, mode) in paths.iter() {
             router = router.route(
                 path,
-                get(render_app_to_stream_with_context(
-                    options.clone(),
-                    additional_context.clone(),
-                    app_fn.clone(),
-                )),
+                match mode {
+                    SsrMode::OutOfOrder => {
+                        get(render_app_to_stream_with_context(
+                            options.clone(),
+                            additional_context.clone(),
+                            app_fn.clone(),
+                        ))
+                    }
+                    SsrMode::InOrder => {
+                        get(render_app_to_stream_in_order_with_context(
+                            options.clone(),
+                            additional_context.clone(),
+                            app_fn.clone(),
+                        ))
+                    }
+                    SsrMode::Async => get(render_app_async_with_context(
+                        options.clone(),
+                        additional_context.clone(),
+                        app_fn.clone(),
+                    )),
+                },
             );
         }
         router
@@ -754,7 +1094,7 @@ impl LeptosRoutes for axum::Router {
 
     fn leptos_routes_with_handler<H, T>(
         self,
-        paths: Vec<String>,
+        paths: Vec<(String, SsrMode)>,
         handler: H,
     ) -> Self
     where
@@ -762,7 +1102,7 @@ impl LeptosRoutes for axum::Router {
         T: 'static,
     {
         let mut router = self;
-        for path in paths.iter() {
+        for (path, _) in paths.iter() {
             router = router.route(path, get(handler.clone()));
         }
         router

integrations/utils/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "leptos_integration_utils"
+version = { workspace = true }
+edition = "2021"
+authors = ["Greg Johnston"]
+license = "MIT"
+repository = "https://github.com/leptos-rs/leptos"
+description = "Utilities to help build server integrations for the Leptos web framework."
+
+[dependencies]
+futures = "0.3"
+leptos = { workspace = true, features = ["ssr"] }
+leptos_meta = { workspace = true, features = ["ssr"] }
+leptos_router = { workspace = true, features = ["ssr"] }
+leptos_config = { workspace = true }

integrations/utils/src/lib.rs

@@ -0,0 +1,100 @@
+use futures::{Stream, StreamExt};
+use leptos::{use_context, RuntimeId, ScopeId};
+use leptos_config::LeptosOptions;
+use leptos_meta::MetaContext;
+
+pub fn html_parts(
+    options: &LeptosOptions,
+    meta: Option<&MetaContext>,
+) -> (String, &'static str) {
+    let pkg_path = &options.site_pkg_dir;
+    let output_name = &options.output_name;
+
+    // Because wasm-pack adds _bg to the end of the WASM filename, and we want to mantain compatibility with it's default options
+    // we add _bg to the wasm files if cargo-leptos doesn't set the env var LEPTOS_OUTPUT_NAME
+    // Otherwise we need to add _bg because wasm_pack always does. This is not the same as options.output_name, which is set regardless
+    let mut wasm_output_name = output_name.clone();
+    if std::env::var("LEPTOS_OUTPUT_NAME").is_err() {
+        wasm_output_name.push_str("_bg");
+    }
+
+    let site_ip = &options.site_addr.ip().to_string();
+    let reload_port = options.reload_port;
+
+    let leptos_autoreload = match std::env::var("LEPTOS_WATCH").is_ok() {
+        true => format!(
+            r#"
+                <script crossorigin="">(function () {{
+                    var ws = new WebSocket('ws://{site_ip}:{reload_port}/live_reload');
+                    ws.onmessage = (ev) => {{
+                        let msg = JSON.parse(ev.data);
+                        if (msg.all) window.location.reload();
+                        if (msg.css) {{
+                            let found = false;
+                            document.querySelectorAll("link").forEach((link) => {{
+                                if (link.getAttribute('href').includes(msg.css)) {{
+                                    let newHref = '/' + msg.css + '?version=' + new Date().getMilliseconds();
+                                    link.setAttribute('href', newHref);
+                                    found = true;
+                                }}
+                            }});
+                            if (!found) console.warn(`CSS hot-reload: Could not find a <link href=/\"${{msg.css}}\"> element`);
+                        }};
+                    }};
+                    ws.onclose = () => console.warn('Live-reload stopped. Manual reload necessary.');
+                }})()
+                </script>
+                "#
+        ),
+        false => "".to_string(),
+    };
+
+    let html_metadata =
+        meta.and_then(|mc| mc.html.as_string()).unwrap_or_default();
+    let head = format!(
+        r#"<!DOCTYPE html>
+            <html{html_metadata}>
+                <head>
+                    <meta charset="utf-8"/>
+                    <meta name="viewport" content="width=device-width, initial-scale=1"/>
+                    <link rel="modulepreload" href="/{pkg_path}/{output_name}.js">
+                    <link rel="preload" href="/{pkg_path}/{wasm_output_name}.wasm" as="fetch" type="application/wasm" crossorigin="">
+                    <script type="module">import init, {{ hydrate }} from '/{pkg_path}/{output_name}.js'; init('/{pkg_path}/{wasm_output_name}.wasm').then(hydrate);</script>
+                    {leptos_autoreload}
+                    "#
+    );
+    let tail = "</body></html>";
+    (head, tail)
+}
+
+pub async fn build_async_response(
+    stream: impl Stream<Item = String> + 'static,
+    options: &LeptosOptions,
+    runtime: RuntimeId,
+    scope: ScopeId,
+) -> String {
+    let mut buf = String::new();
+    let mut stream = Box::pin(stream);
+    while let Some(chunk) = stream.next().await {
+        buf.push_str(&chunk);
+    }
+
+    let cx = leptos::Scope { runtime, id: scope };
+    let (head, tail) =
+        html_parts(options, use_context::<MetaContext>(cx).as_ref());
+
+    // in async, we load the meta content *now*, after the suspenses have resolved
+    let meta = use_context::<MetaContext>(cx);
+    let head_meta = meta
+        .as_ref()
+        .map(|meta| meta.dehydrate())
+        .unwrap_or_default();
+    let body_meta = meta
+        .as_ref()
+        .and_then(|meta| meta.body.as_string())
+        .unwrap_or_default();
+
+    runtime.dispose();
+
+    format!("{head}{head_meta}</head><body{body_meta}>{buf}{tail}")
+}

integrations/viz/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "leptos_viz"
+version = { workspace = true }
+edition = "2021"
+authors = ["Greg Johnston", "Fangdun Tsai"]
+license = "MIT"
+repository = "https://github.com/leptos-rs/leptos"
+description = "Viz integrations for the Leptos web framework."
+
+[dependencies]
+viz = { version = "0.4.8" }
+futures = "0.3"
+http = "0.2.8"
+hyper = "0.14.23"
+leptos = { workspace = true, features = ["ssr"] }
+leptos_meta = { workspace = true, features = ["ssr"] }
+leptos_router = { workspace = true, features = ["ssr"] }
+leptos_config = { workspace = true }
+leptos_integration_utils = { workspace = true }
+tokio = { version = "1", features = ["full"] }
+parking_lot = "0.12.1"

leptos/src/error_boundary.rs

@@ -1,7 +1,9 @@
 use crate::Children;
 use leptos_dom::{Errors, IntoView};
 use leptos_macro::{component, view};
-use leptos_reactive::{create_rw_signal, provide_context, RwSignal, Scope};
+use leptos_reactive::{
+    create_rw_signal, provide_context, signal_prelude::*, RwSignal, Scope,
+};
 
 /// When you render a `Result<_, _>` in your view, in the `Err` case it will
 /// render nothing, and search up through the view tree for an `<ErrorBoundary/>`.

leptos/src/lib.rs

@@ -58,8 +58,9 @@
 //!   and [`hackernews_axum`](https://github.com/leptos-rs/leptos/tree/main/examples/hackernews_axum)
 //!   integrate calls to a real external REST API, routing, server-side rendering and hydration to create
 //!   a fully-functional that works as intended even before WASM has loaded and begun to run.
-//! - [`todo_app_sqlite`](https://github.com/leptos-rs/leptos/tree/main/examples/todo_app_sqlite) and
-//!   [`todo_app_sqlite_axum`](https://github.com/leptos-rs/leptos/tree/main/examples/todo_app_sqlite_axum)
+//! - [`todo_app_sqlite`](https://github.com/leptos-rs/leptos/tree/main/examples/todo_app_sqlite),
+//!   [`todo_app_sqlite_axum`](https://github.com/leptos-rs/leptos/tree/main/examples/todo_app_sqlite_axum), and
+//!   [`todo_app_sqlite_viz`](https://github.com/leptos-rs/leptos/tree/main/examples/todo_app_sqlite_viz)
 //!   show how to build a full-stack app using server functions and database connections.
 //! - [`tailwind`](https://github.com/leptos-rs/leptos/tree/main/examples/tailwind) shows how to integrate
 //!   TailwindCSS with `cargo-leptos`.
@@ -146,7 +147,10 @@ pub use leptos_config::{self, get_configuration, LeptosOptions};
     target_arch = "wasm32",
     any(feature = "csr", feature = "hydrate")
 )))]
-pub use leptos_dom::ssr::{self, render_to_string};
+/// Utilities for server-side rendering HTML.
+pub mod ssr {
+    pub use leptos_dom::{ssr::*, ssr_in_order::*};
+}
 pub use leptos_dom::{
     self, create_node_ref, debug_warn, document, error, ev,
     helpers::{

leptos/src/show.rs

@@ -1,6 +1,6 @@
 use leptos::component;
 use leptos_dom::{Fragment, IntoView};
-use leptos_reactive::{create_memo, Scope};
+use leptos_reactive::{create_memo, signal_prelude::*, Scope};
 
 /// A component that will show its children when the `when` condition is `true`,
 /// and show the fallback when it is `false`, without rerendering every time

leptos/src/suspense.rs

@@ -28,7 +28,7 @@ use std::rc::Rc;
 ///   <div>
 ///     <Suspense fallback=move || view! { cx, <p>"Loading (Suspense Fallback)..."</p> }>
 ///       {move || {
-///           cats.read().map(|data| match data {
+///           cats.read(cx).map(|data| match data {
 ///             None => view! { cx,  <pre>"Error"</pre> }.into_any(),
 ///             Some(cats) => view! { cx,
 ///               <div>{
@@ -62,8 +62,6 @@ where
     F: Fn() -> E + 'static,
     E: IntoView,
 {
-    #[cfg(not(any(feature = "csr", feature = "hydrate")))]
-    let id_before_suspense = HydrationCtx::peek();
     let context = SuspenseContext::new(cx);
 
     // provide this SuspenseContext to any resources below it
@@ -71,7 +69,8 @@ where
 
     let orig_child = Rc::new(children);
 
-    let current_id = HydrationCtx::peek();
+    let before_me = HydrationCtx::peek();
+    let current_id = HydrationCtx::next_component();
 
     let child = DynChild::new({
         #[cfg(not(any(feature = "csr", feature = "hydrate")))]
@@ -85,8 +84,11 @@ where
                         fallback().into_view(cx)
                     }
                 } else {
+                    use leptos_reactive::signal_prelude::*;
+
                     // run the child; we'll probably throw this away, but it will register resource reads
                     let child = orig_child(cx).into_view(cx);
+                    let after_original_child = HydrationCtx::id();
 
                     let initial = {
                         // no resources were read under this, so just return the child
@@ -99,10 +101,11 @@ where
 
                             cx.register_suspense(
                                 context,
-                                &id_before_suspense.to_string(),
                                 &current_id.to_string(),
+                                // out-of-order streaming
                                 {
                                     let current_id = current_id.clone();
+                                    let orig_child = Rc::clone(&orig_child);
                                     move || {
                                         HydrationCtx::continue_from(current_id.clone());
                                         DynChild::new(move || orig_child(cx))
@@ -110,6 +113,16 @@ where
                                             .render_to_string(cx)
                                             .to_string()
                                     }
+                                },
+                                // in-order streaming
+                                {
+                                    let current_id = current_id.clone();
+                                    move || {
+                                        HydrationCtx::continue_from(current_id.clone());
+                                        DynChild::new(move || orig_child(cx))
+                                            .into_view(cx)
+                                            .into_stream_chunks(cx)
+                                    }
                                 }
                             );
 
@@ -118,8 +131,7 @@ where
                         }
                     };
 
-                    HydrationCtx::continue_from(current_id.clone());
-
+                    HydrationCtx::continue_from(after_original_child);
                     initial
                 }
             }
@@ -131,5 +143,7 @@ where
         _ => unreachable!(),
     };
 
+    HydrationCtx::continue_from(before_me);
+
     leptos_dom::View::Suspense(current_id, core_component)
 }

leptos/src/transition.rs

@@ -1,7 +1,10 @@
 use leptos_dom::{Fragment, IntoView, View};
 use leptos_macro::component;
-use leptos_reactive::{Scope, SignalSetter};
-use std::{cell::RefCell, rc::Rc};
+use leptos_reactive::{use_context, Scope, SignalSetter, SuspenseContext};
+use std::{
+    cell::{Cell, RefCell},
+    rc::Rc,
+};
 
 /// If any [Resource](leptos_reactive::Resource)s are read in the `children` of this
 /// component, it will show the `fallback` while they are loading. Once all are resolved,
@@ -35,7 +38,7 @@ use std::{cell::RefCell, rc::Rc};
 ///       set_pending=set_pending.into()
 ///     >
 ///       {move || {
-///           cats.read().map(|data| match data {
+///           cats.read(cx).map(|data| match data {
 ///             None => view! { cx,  <pre>"Error"</pre> }.into_any(),
 ///             Some(cats) => view! { cx,
 ///               <div>{
@@ -74,18 +77,34 @@ where
     F: Fn() -> E + 'static,
     E: IntoView,
 {
-    let prev_children = std::rc::Rc::new(RefCell::new(None::<Vec<View>>));
+    let prev_children = Rc::new(RefCell::new(None::<Vec<View>>));
+
+    let first_run = Rc::new(std::cell::Cell::new(true));
+    let child_runs = Cell::new(0);
+
     crate::Suspense(
         cx,
         crate::SuspenseProps::builder()
             .fallback({
                 let prev_child = Rc::clone(&prev_children);
+                let first_run = Rc::clone(&first_run);
                 move || {
+                    let suspense_context = use_context::<SuspenseContext>(cx)
+                        .expect("there to be a SuspenseContext");
+
+                    let is_first_run =
+                        is_first_run(&first_run, &suspense_context);
+                    first_run.set(is_first_run);
+
                     if let Some(set_pending) = &set_pending {
                         set_pending.set(true);
                     }
                     if let Some(prev_children) = &*prev_child.borrow() {
-                        prev_children.clone().into_view(cx)
+                        if is_first_run {
+                            fallback().into_view(cx)
+                        } else {
+                            prev_children.clone().into_view(cx)
+                        }
                     } else {
                         fallback().into_view(cx)
                     }
@@ -93,7 +112,21 @@ where
             })
             .children(Box::new(move |cx| {
                 let frag = children(cx);
-                *prev_children.borrow_mut() = Some(frag.nodes.clone());
+
+                let suspense_context = use_context::<SuspenseContext>(cx)
+                    .expect("there to be a SuspenseContext");
+
+                if is_first_run(&first_run, &suspense_context) {
+                    let has_local_only = suspense_context.has_local_only();
+                    *prev_children.borrow_mut() = Some(frag.nodes.clone());
+                    if (has_local_only && child_runs.get() > 0)
+                        || !has_local_only
+                    {
+                        first_run.set(false);
+                    }
+                }
+                child_runs.set(child_runs.get() + 1);
+
                 if let Some(set_pending) = &set_pending {
                     set_pending.set(false);
                 }
@@ -102,3 +135,22 @@ where
             .build(),
     )
 }
+
+fn is_first_run(
+    first_run: &Rc<Cell<bool>>,
+    suspense_context: &SuspenseContext,
+) -> bool {
+    match (
+        first_run.get(),
+        cfg!(feature = "hydrate"),
+        suspense_context.has_local_only(),
+    ) {
+        (false, _, _) => false,
+        // is in hydrate mode, and has non-local resources (so, has streamed)
+        (_, false, false) => false,
+        // is in hydrate mode, but with only local resources (so, has not streamed)
+        (_, false, true) => true,
+        // either SSR or client mode: it's the first run
+        (_, true, _) => true,
+    }
+}

leptos/tests/ssr.rs

@@ -54,8 +54,8 @@ fn ssr_test_with_components() {
 
         assert_eq!(
             rendered.into_view(cx).render_to_string(cx),
-            "<div id=\"_0-1\" \
-             class=\"counters\"><!--hk=_0-1-0o|leptos-counter-start--><div \
+            "<div class=\"counters\" \
+             id=\"_0-1\"><!--hk=_0-1-0o|leptos-counter-start--><div \
              id=\"_0-1-1\"><button id=\"_0-1-2\">-1</button><span \
              id=\"_0-1-3\">Value: \
              <!--hk=_0-1-4o|leptos-dyn-child-start-->1<!\
@@ -102,8 +102,8 @@ fn ssr_test_with_snake_case_components() {
 
         assert_eq!(
             rendered.into_view(cx).render_to_string(cx),
-            "<div id=\"_0-1\" \
-             class=\"counters\"><!\
+            "<div class=\"counters\" \
+             id=\"_0-1\"><!\
              --hk=_0-1-0o|leptos-snake-case-counter-start--><div \
              id=\"_0-1-1\"><button id=\"_0-1-2\">-1</button><span \
              id=\"_0-1-3\">Value: \
@@ -136,7 +136,7 @@ fn test_classes() {
 
         assert_eq!(
             rendered.into_view(cx).render_to_string(cx),
-            "<div id=\"_0-1\" class=\"my big  red car\"></div>"
+            "<div class=\"my big red car\" id=\"_0-1\"></div>"
         );
     });
 }
@@ -147,7 +147,7 @@ fn ssr_with_styles() {
     use leptos::*;
 
     _ = create_scope(create_runtime(), |cx| {
-        let (value, set_value) = create_signal(cx, 0);
+        let (_, set_value) = create_signal(cx, 0);
         let styles = "myclass";
         let rendered = view! {
             cx, class = styles,
@@ -158,8 +158,8 @@ fn ssr_with_styles() {
 
         assert_eq!(
             rendered.into_view(cx).render_to_string(cx),
-            "<div id=\"_0-1\" class=\" myclass\"><button id=\"_0-2\" \
-             class=\"btn myclass\">-1</button></div>"
+            "<div class=\"myclass\" id=\"_0-1\"><button class=\"btn myclass\" \
+             id=\"_0-2\">-1</button></div>"
         );
     });
 }
@@ -170,7 +170,7 @@ fn ssr_option() {
     use leptos::*;
 
     _ = create_scope(create_runtime(), |cx| {
-        let (value, set_value) = create_signal(cx, 0);
+        let (_, _) = create_signal(cx, 0);
         let rendered = view! {
             cx,
             <option/>

leptos_config/src/lib.rs

@@ -16,7 +16,7 @@ pub struct ConfFile {
 }
 
 /// This struct serves as a convenient place to store details used for configuring Leptos.
-/// It's used in our actix and axum integrations to generate the
+/// It's used in our actix, axum, and viz integrations to generate the
 /// correct path for WASM, JS, and Websockets, as well as other configuration tasks.
 /// It shares keys with cargo-leptos, to allow for easy interoperability
 #[derive(TypedBuilder, Debug, Clone, serde::Deserialize)]

leptos_dom/Cargo.toml

@@ -8,6 +8,7 @@ repository = "https://github.com/leptos-rs/leptos"
 description = "DOM operations for the Leptos web framework."
 
 [dependencies]
+async-recursion = "1"
 cfg-if = "1"
 drain_filter_polyfill = "0.1"
 educe = "0.4"

leptos_dom/src/components/dyn_child.rs

@@ -138,11 +138,13 @@ where
 {
     /// Creates a new dynamic child which will re-render whenever it's
     /// signal dependencies change.
+    #[track_caller]
     pub fn new(child_fn: CF) -> Self {
         Self::new_with_id(HydrationCtx::id(), child_fn)
     }
 
     #[doc(hidden)]
+    #[track_caller]
     pub fn new_with_id(id: HydrationKey, child_fn: CF) -> Self {
         Self { id, child_fn }
     }

leptos_dom/src/components/each.rs

@@ -166,11 +166,11 @@ impl Mountable for EachRepr {
 pub(crate) struct EachItem {
     cx: Scope,
     #[cfg(all(target_arch = "wasm32", feature = "web"))]
-    document_fragment: web_sys::DocumentFragment,
+    document_fragment: Option<web_sys::DocumentFragment>,
     #[cfg(debug_assertions)]
     opening: Comment,
     pub(crate) child: View,
-    closing: Comment,
+    closing: Option<Comment>,
     #[cfg(not(all(target_arch = "wasm32", feature = "web")))]
     pub(crate) id: HydrationKey,
 }
@@ -192,16 +192,22 @@ impl fmt::Debug for EachItem {
 impl EachItem {
     fn new(cx: Scope, child: View) -> Self {
         let id = HydrationCtx::id();
+        let needs_closing = !matches!(child, View::Element(_));
 
         let markers = (
-            Comment::new(Cow::Borrowed("</EachItem>"), &id, true),
+            if needs_closing {
+                Some(Comment::new(Cow::Borrowed("</EachItem>"), &id, true))
+            } else {
+                None
+            },
             #[cfg(debug_assertions)]
             Comment::new(Cow::Borrowed("<EachItem>"), &id, false),
         );
 
         #[cfg(all(target_arch = "wasm32", feature = "web"))]
-        let document_fragment = {
+        let document_fragment = if needs_closing {
             let fragment = crate::document().create_document_fragment();
+            let closing = markers.0.as_ref().unwrap();
 
             // Insert the comments into the document fragment
             // so they can serve as our references when inserting
@@ -209,14 +215,16 @@ impl EachItem {
             if !HydrationCtx::is_hydrating() {
                 #[cfg(debug_assertions)]
                 fragment
-                    .append_with_node_2(&markers.1.node, &markers.0.node)
+                    .append_with_node_2(&markers.1.node, &closing.node)
                     .unwrap();
-                fragment.append_with_node_1(&markers.0.node).unwrap();
+                fragment.append_with_node_1(&closing.node).unwrap();
             }
 
-            mount_child(MountKind::Before(&markers.0.node), &child);
+            mount_child(MountKind::Before(&closing.node), &child);
 
-            fragment
+            Some(fragment)
+        } else {
+            None
         };
 
         Self {
@@ -243,7 +251,11 @@ impl Drop for EachItem {
 #[cfg(all(target_arch = "wasm32", feature = "web"))]
 impl Mountable for EachItem {
     fn get_mountable_node(&self) -> web_sys::Node {
-        self.document_fragment.clone().unchecked_into()
+        if let Some(fragment) = &self.document_fragment {
+            fragment.clone().unchecked_into()
+        } else {
+            self.child.get_mountable_node()
+        }
     }
 
     fn get_opening_node(&self) -> web_sys::Node {
@@ -255,7 +267,11 @@ impl Mountable for EachItem {
     }
 
     fn get_closing_node(&self) -> web_sys::Node {
-        self.closing.node.clone()
+        if let Some(closing) = &self.closing {
+            closing.node.clone().unchecked_into()
+        } else {
+            self.child.get_mountable_node().clone()
+        }
     }
 }
 
@@ -264,20 +280,25 @@ impl EachItem {
     /// order to be reinserted somewhere else.
     #[cfg(all(target_arch = "wasm32", feature = "web"))]
     fn prepare_for_move(&self) {
-        let start = self.get_opening_node();
-        let end = &self.closing.node;
+        if let Some(fragment) = &self.document_fragment {
+            let start = self.get_opening_node();
+            let end = &self.get_closing_node();
 
-        let mut sibling = start;
+            let mut sibling = start;
 
-        while sibling != *end {
-            let next_sibling = sibling.next_sibling().unwrap();
+            while sibling != *end {
+                let next_sibling = sibling.next_sibling().unwrap();
 
-            self.document_fragment.append_child(&sibling).unwrap();
+                fragment.append_child(&sibling).unwrap();
 
-            sibling = next_sibling;
+                sibling = next_sibling;
+            }
+
+            fragment.append_with_node_1(end).unwrap();
+        } else {
+            let node = self.child.get_mountable_node();
+            node.unchecked_into::<web_sys::Element>().remove();
         }
-
-        self.document_fragment.append_with_node_1(end).unwrap();
     }
 }
 
@@ -349,7 +370,7 @@ where
 
         cfg_if::cfg_if! {
           if #[cfg(all(target_arch = "wasm32", feature = "web"))] {
-            create_effect(cx, move |prev_hash_run| {
+            create_effect(cx, move |prev_hash_run: Option<HashRun<FxIndexSet<K>>>| {
               let mut children_borrow = children.borrow_mut();
 
               #[cfg(all(target_arch = "wasm32", feature = "web"))]
@@ -359,39 +380,60 @@ where
                 closing.clone()
               };
 
-              let items = items_fn();
+                let items_iter = items_fn().into_iter();
 
-              let items = items.into_iter().collect::<SmallVec<[_; 128]>>();
-
-              let hashed_items =
-                items.iter().map(&key_fn).collect::<FxIndexSet<_>>();
+                let (capacity, _) = items_iter.size_hint();
+                let mut hashed_items = FxIndexSet::with_capacity_and_hasher(
+                    capacity,
+                    BuildHasherDefault::<FxHasher>::default()
+                );
 
               if let Some(HashRun(prev_hash_run)) = prev_hash_run {
-                let cmds = diff(&prev_hash_run, &hashed_items);
+                if !prev_hash_run.is_empty() {
+                    let mut items = Vec::with_capacity(capacity);
+                    for item in items_iter {
+                        hashed_items.insert(key_fn(&item));
+                        items.push(Some(item));
+                    }
 
-                apply_cmds(
-                  cx,
-                  #[cfg(all(target_arch = "wasm32", feature = "web"))]
-                  &opening,
-                  #[cfg(all(target_arch = "wasm32", feature = "web"))]
-                  &closing,
-                  cmds,
-                  &mut children_borrow,
-                  items.into_iter().map(|t| Some(t)).collect(),
-                  &each_fn
-                );
-              } else {
-                *children_borrow = Vec::with_capacity(items.len());
+                    let cmds = diff(&prev_hash_run, &hashed_items);
 
-                for item in items {
+                    apply_cmds(
+                        cx,
+                        #[cfg(all(target_arch = "wasm32", feature = "web"))]
+                        &opening,
+                        #[cfg(all(target_arch = "wasm32", feature = "web"))]
+                        &closing,
+                        cmds,
+                        &mut children_borrow,
+                        items,
+                        &each_fn
+                    );
+                    return HashRun(hashed_items);
+                }
+            }
+
+                // if previous run is empty
+                *children_borrow = Vec::with_capacity(capacity);
+                #[cfg(all(target_arch = "wasm32", feature = "web"))]
+                let fragment = crate::document().create_document_fragment();
+
+                for item in items_iter {
+                  hashed_items.insert(key_fn(&item));
                   let (each_item, _) = cx.run_child_scope(|cx| EachItem::new(cx, each_fn(cx, item).into_view(cx)));
-
-                  #[cfg(all(target_arch = "wasm32", feature = "web"))]
-                  mount_child(MountKind::Before(&closing), &each_item);
+                #[cfg(all(target_arch = "wasm32", feature = "web"))]
+                {
+                  _ = fragment.append_child(&each_item.get_mountable_node());
+                }
 
                   children_borrow.push(Some(each_item));
                 }
-              }
+
+                #[cfg(all(target_arch = "wasm32", feature = "web"))]
+                closing
+                .unchecked_ref::<web_sys::Element>()
+                .before_with_node_1(&fragment)
+                .expect("before to not err");
 
               HashRun(hashed_items)
             });
@@ -421,6 +463,18 @@ fn diff<K: Eq + Hash>(from: &FxIndexSet<K>, to: &FxIndexSet<K>) -> Diff {
             clear: true,
             ..Default::default()
         };
+    } else if from.is_empty() {
+        return Diff {
+            added: to
+                .iter()
+                .enumerate()
+                .map(|(at, _)| DiffOpAdd {
+                    at,
+                    mode: DiffOpAddMode::Append,
+                })
+                .collect(),
+            ..Default::default()
+        };
     }
 
     // Get removed items
@@ -445,7 +499,7 @@ fn diff<K: Eq + Hash>(from: &FxIndexSet<K>, to: &FxIndexSet<K>) -> Diff {
 
     // Get moved items
     let mut normalized_idx = 0;
-    let mut move_cmds = SmallVec::<[_; 8]>::with_capacity(to.len());
+    let mut move_cmds = Vec::new();
     let mut added_idx = added.next().map(|k| to.get_full(k).unwrap().0);
     let mut removed_idx = removed.next().map(|k| from.get_full(k).unwrap().0);
 
@@ -539,9 +593,9 @@ fn apply_opts<K: Eq + Hash>(
 #[derive(Debug, Default)]
 #[allow(unused)]
 struct Diff {
-    removed: SmallVec<[DiffOpRemove; 8]>,
-    moved: SmallVec<[DiffOpMove; 8]>,
-    added: SmallVec<[DiffOpAdd; 8]>,
+    removed: Vec<DiffOpRemove>,
+    moved: Vec<DiffOpMove>,
+    added: Vec<DiffOpAdd>,
     clear: bool,
 }
 
@@ -588,7 +642,7 @@ fn apply_cmds<T, EF, N>(
     closing: &web_sys::Node,
     mut cmds: Diff,
     children: &mut Vec<Option<EachItem>>,
-    mut items: SmallVec<[Option<T>; 128]>,
+    mut items: Vec<Option<T>>,
     each_fn: &EF,
 ) where
     EF: Fn(Scope, T) -> N,

leptos_dom/src/components/errors.rs

@@ -1,6 +1,6 @@
 use crate::{HydrationCtx, IntoView};
 use cfg_if::cfg_if;
-use leptos_reactive::{use_context, RwSignal};
+use leptos_reactive::{signal_prelude::*, use_context, RwSignal};
 use std::{collections::HashMap, error::Error, sync::Arc};
 
 /// A struct to hold all the possible errors that could be provided by child Views

leptos_dom/src/events.rs

@@ -23,7 +23,12 @@ pub fn add_event_helper<E: crate::ev::EventDescriptor + 'static>(
     let event_name = event.name();
 
     if event.bubbles() {
-        add_event_listener(target, event_name, event_handler);
+        add_event_listener(
+            target,
+            event.event_delegation_key(),
+            event_name,
+            event_handler,
+        );
     } else {
         add_event_listener_undelegated(target, &event_name, event_handler);
     }
@@ -34,6 +39,7 @@ pub fn add_event_helper<E: crate::ev::EventDescriptor + 'static>(
 #[cfg(all(target_arch = "wasm32", feature = "web"))]
 pub fn add_event_listener<E>(
     target: &web_sys::Element,
+    key: Cow<'static, str>,
     event_name: Cow<'static, str>,
     #[cfg(debug_assertions)] mut cb: impl FnMut(E) + 'static,
     #[cfg(not(debug_assertions))] cb: impl FnMut(E) + 'static,
@@ -51,9 +57,9 @@ pub fn add_event_listener<E>(
     }
 
     let cb = Closure::wrap(Box::new(cb) as Box<dyn FnMut(E)>).into_js_value();
-    let key = event_delegation_key(&event_name);
+    let key = intern(&key);
     _ = js_sys::Reflect::set(target, &JsValue::from_str(&key), &cb);
-    add_delegated_event_listener(event_name);
+    add_delegated_event_listener(&key, event_name);
 }
 
 #[doc(hidden)]
@@ -61,7 +67,8 @@ pub fn add_event_listener<E>(
 pub(crate) fn add_event_listener_undelegated<E>(
     target: &web_sys::Element,
     event_name: &str,
-    mut cb: impl FnMut(E) + 'static,
+    #[cfg(debug_assertions)] mut cb: impl FnMut(E) + 'static,
+    #[cfg(not(debug_assertions))] cb: impl FnMut(E) + 'static,
 ) where
     E: FromWasmAbi + 'static,
 {
@@ -82,12 +89,15 @@ pub(crate) fn add_event_listener_undelegated<E>(
 
 // cf eventHandler in ryansolid/dom-expressions
 #[cfg(all(target_arch = "wasm32", feature = "web"))]
-pub(crate) fn add_delegated_event_listener(event_name: Cow<'static, str>) {
+pub(crate) fn add_delegated_event_listener(
+    key: &str,
+    event_name: Cow<'static, str>,
+) {
     GLOBAL_EVENTS.with(|global_events| {
         let mut events = global_events.borrow_mut();
         if !events.contains(&event_name) {
             // create global handler
-            let key = JsValue::from_str(&event_delegation_key(&event_name));
+            let key = JsValue::from_str(&key);
             let handler = move |ev: web_sys::Event| {
                 let target = ev.target();
                 let node = ev.composed_path().get(0);
@@ -163,11 +173,3 @@ pub(crate) fn add_delegated_event_listener(event_name: Cow<'static, str>) {
         }
     })
 }
-
-#[cfg(all(target_arch = "wasm32", feature = "web"))]
-pub(crate) fn event_delegation_key(event_name: &str) -> String {
-    let event_name = intern(event_name);
-    let mut n = String::from("$$$");
-    n.push_str(event_name);
-    n
-}

leptos_dom/src/events/typed.rs

@@ -11,6 +11,9 @@ pub trait EventDescriptor: Clone {
     /// The name of the event, such as `click` or `mouseover`.
     fn name(&self) -> Cow<'static, str>;
 
+    /// The key used for event delegation.
+    fn event_delegation_key(&self) -> Cow<'static, str>;
+
     /// Indicates if this event bubbles. For example, `click` bubbles,
     /// but `focus` does not.
     ///
@@ -34,6 +37,10 @@ impl<Ev: EventDescriptor> EventDescriptor for undelegated<Ev> {
         self.0.name()
     }
 
+    fn event_delegation_key(&self) -> Cow<'static, str> {
+        self.0.event_delegation_key()
+    }
+
     fn bubbles(&self) -> bool {
         false
     }
@@ -61,6 +68,10 @@ impl<E: FromWasmAbi> EventDescriptor for Custom<E> {
         self.name.clone()
     }
 
+    fn event_delegation_key(&self) -> Cow<'static, str> {
+        format!("$$${}", self.name).into()
+    }
+
     fn bubbles(&self) -> bool {
         false
     }
@@ -97,6 +108,10 @@ macro_rules! generate_event_types {
             stringify!($event).into()
           }
 
+          fn event_delegation_key(&self) -> Cow<'static, str> {
+            concat!("$$$", stringify!($event)).into()
+          }
+
           $(
             generate_event_types!($does_not_bubble);
           )?
@@ -226,6 +241,7 @@ generate_event_types! {
   submit: SubmitEvent,
   suspend: Event,
   timeupdate: Event,
+  #[does_not_bubble]
   toggle: Event,
   touchcancel: TouchEvent,
   touchend: TouchEvent,