Add support for WASI P3

Cargo.toml

@@ -17,22 +17,24 @@ The Spin Rust SDK makes it easy to build Spin components in Rust.
 name = "spin_sdk"
 
 [dependencies]
-anyhow = "1"
+anyhow = { workspace = true }
 async-trait = "0.1.74"
 chrono = "0.4.38"
 form_urlencoded = "1.0"
 postgres_range = { version = "0.11.1", optional = true }
 rust_decimal = { version = "1.37.2", default-features = false, optional = true }
 spin-executor = { version = "5.0.0", path = "crates/executor" }
 spin-macro = { version = "5.0.0", path = "crates/macro" }
-thiserror = "1.0.37"
+spin-wasip3-http = { version = "5.0.0", path = "crates/spin-wasip3-http", optional = true }
+spin-wasip3-http-macro = { version = "5.0.0", path = "crates/spin-wasip3-http-macro", optional = true }
+thiserror = { workspace = true }
 uuid = { version = "1.18.0", optional = true }
 wit-bindgen = { workspace = true }
 routefinder = "0.5.3"
 once_cell = { workspace = true }
 futures = { workspace = true }
-bytes = "1"
-hyperium = { package = "http", version = "1.0.0" }
+bytes = { workspace = true }
+hyperium = { workspace = true }
 serde_json = { version = "1.0.96", optional = true }
 serde = { version = "1.0.163", optional = true }
 wasi = { workspace = true }
@@ -42,6 +44,7 @@ default = ["export-sdk-language", "json", "postgres4-types"]
 export-sdk-language = []
 json = ["dep:serde", "dep:serde_json"]
 postgres4-types = ["dep:rust_decimal", "dep:uuid", "dep:postgres_range", "json"]
+wasip3-unstable = ["dep:spin-wasip3-http", "dep:spin-wasip3-http-macro"]
 
 [workspace]
 resolver = "2"
@@ -65,6 +68,9 @@ members = [
   "examples/variables",
   "examples/wasi-http-streaming-outgoing-body",
   "examples/wasi-http-streaming-file",
+  "examples/wasip3-http-axum-router",
+  "examples/wasip3-http-hello-world",
+  "examples/wasip3-http-send-request",
   "test-cases/simple-http",
   "test-cases/simple-redis",
   "crates/*",
@@ -92,12 +98,18 @@ authors = ["Spin Framework Maintainers <[email protected]>"]
 edition = "2021"
 license = "Apache-2.0 WITH LLVM-exception"
 repository = "https://github.com/spinframework/spin-rust-sdk"
-rust-version = "1.78"
+rust-version = "1.86"
 homepage = "https://spinframework.dev/rust-components"
 
 [workspace.dependencies]
+anyhow = "1"
+hyperium = { package = "http", version = "1.3.1" }
+http-body = "1.0.1"
+http-body-util = "0.1.3"
+bytes = "1.10.1"
 wit-bindgen = "0.43.0"
 futures = "0.3.28"
 once_cell = "1.18.0"
+thiserror = "2.0.17"
 # Pin to the last version that targeted WASI 0.2.0
 wasi = "=0.13.1"

crates/spin-wasip3-http-macro/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "spin-wasip3-http-macro"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+homepage.workspace = true
+description = """
+Rust procedural macros for Spin and WASIp3
+"""
+
+[lib]
+name = "spin_wasip3_http_macro"
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1"
+quote = "1.0"
+syn = { version = "1.0", features = [ "full" ]}

crates/spin-wasip3-http-macro/src/lib.rs

@@ -0,0 +1,63 @@
+use proc_macro::TokenStream;
+use quote::quote;
+
+/// Marks an `async fn` as an HTTP component entrypoint for Spin.
+///
+/// The `#[http_component]` attribute designates an asynchronous function as the
+/// handler for incoming HTTP requests in a Spin component using the WASI Preview 3
+/// (`wasip3`) HTTP ABI.  
+///
+/// When applied, this macro generates the necessary boilerplate to export the
+/// function to the Spin runtime as a valid HTTP handler. The function must be
+/// declared `async` and take a single argument implementing
+/// [`FromRequest`](::spin_sdk::http_wasip3::FromRequest), typically
+/// [`Request`](::spin_sdk::http_wasip3::Request), and must return a type that
+/// implements [`IntoResponse`](::spin_sdk::http_wasip3::IntoResponse).
+///
+/// # Requirements
+///
+/// - The annotated function **must** be `async`.
+/// - The function’s parameter type must implement [`FromRequest`].
+/// - The return type must implement [`IntoResponse`].
+///
+/// If the function is not asynchronous, the macro emits a compile-time error.
+///
+/// # Generated Code
+///
+/// The macro expands into a module containing a `Spin` struct that implements the
+/// WASI `http.handler/Guest` interface, wiring the annotated function as the
+/// handler’s entrypoint. This allows the function to be invoked automatically
+/// by the Spin runtime when HTTP requests are received.
+#[proc_macro_attribute]
+pub fn http_component(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    let func = syn::parse_macro_input!(item as syn::ItemFn);
+
+    if func.sig.asyncness.is_none() {
+        return syn::Error::new_spanned(
+            func.sig.fn_token,
+            "the `#[http_component]` function must be `async`",
+        )
+        .to_compile_error()
+        .into();
+    }
+
+    let func_name = &func.sig.ident;
+
+    quote!(
+        #func
+        mod __spin_wasip3_http {
+            use ::spin_sdk::http_wasip3::IntoResponse;
+
+            struct Spin;
+            ::spin_sdk::http_wasip3::wasip3::http::proxy::export!(Spin);
+
+            impl ::spin_sdk::http_wasip3::wasip3::exports::http::handler::Guest for self::Spin {
+                async fn handle(request: ::spin_sdk::http_wasip3::wasip3::http::types::Request) -> Result<::spin_sdk::http_wasip3::wasip3::http::types::Response, ::spin_sdk::http_wasip3::wasip3::http::types::ErrorCode> {
+                    let request = <::spin_sdk::http_wasip3::Request as ::spin_sdk::http_wasip3::FromRequest>::from_request(request)?;
+                    ::spin_sdk::http_wasip3::IntoResponse::into_response(super::#func_name(request).await)
+                }
+            }
+        }
+    )
+    .into()
+}

crates/spin-wasip3-http/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "spin-wasip3-http"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+homepage.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+bytes = { workspace = true }
+http-body = { workspace = true }
+http-body-util = { workspace = true }
+hyperium = { workspace = true }
+wasip3-http-ext = { version = "5.0.0", path = "../wasip3-http-ext" }