Switch to the http crate's Request, Response, and StatusCode.

Since as of #19, wstd is using the http crate's types for `HeaderMap`,
`Method`, and `Uri`, switch it to use the http crate's types for `Request`,
`Response`, and `StatusCode` too. These types have a few more features,
and this change makes wstd more interoperable with code that uses the http
crate.

This also helps with #34, as the new `Request` and `Response` types here
are independent of being incoming or outgoing.

Author: sunfishcode

src/http/body.rs

@@ -10,7 +10,7 @@ pub trait Body: AsyncRead {
     /// Returns the exact remaining length of the iterator, if known.
     fn len(&self) -> Option<usize>;
 
-    /// Returns `true`` if the body is known to be empty.
+    /// Returns `true` if the body is known to be empty.
     fn is_empty(&self) -> bool {
         matches!(self.len(), Some(0))
     }

src/http/client.rs

@@ -1,4 +1,6 @@
-use super::{response::IncomingBody, Body, Error, Request, Response, Result};
+use super::{body::IncomingBody, Error, Request, Response, Result};
+use crate::http::request::into_outgoing;
+use crate::http::response::try_from_incoming_response;
 use crate::io::{self, AsyncOutputStream, AsyncPollable};
 use crate::time::Duration;
 use wasi::http::types::{OutgoingBody, RequestOptions as WasiRequestOptions};
@@ -18,7 +20,7 @@ impl Client {
 
     /// Send an HTTP request.
     pub async fn send<B: Body>(&self, req: Request<B>) -> Result<Response<IncomingBody>> {
-        let (wasi_req, body) = req.into_outgoing()?;
+        let (wasi_req, body) = into_outgoing(req)?;
         let wasi_body = wasi_req.body().unwrap();
         let body_stream = wasi_body.write().unwrap();
 
@@ -39,7 +41,7 @@ impl Client {
         // is to trap if we try and get the response more than once. The final
         // `?` is to raise the actual error if there is one.
         let res = res.get().unwrap().unwrap()?;
-        Ok(Response::try_from_incoming_response(res)?)
+        try_from_incoming_response(res)
     }
 
     /// Set timeout on connecting to HTTP server

src/http/mod.rs

@@ -1,5 +1,6 @@
 //! HTTP networking support
 //!
+pub use http::status::StatusCode;
 pub use http::uri::Uri;
 
 #[doc(inline)]
@@ -10,7 +11,6 @@ pub use fields::{HeaderMap, HeaderName, HeaderValue};
 pub use method::Method;
 pub use request::Request;
 pub use response::Response;
-pub use status_code::StatusCode;
 
 pub mod body;
 
@@ -20,4 +20,3 @@ mod fields;
 mod method;
 mod request;
 mod response;
-mod status_code;

src/http/request.rs

@@ -1,96 +1,45 @@
-use crate::io::{empty, Empty};
-
-use super::{
-    fields::header_map_to_wasi, method::to_wasi_method, Body, Error, HeaderMap, IntoBody, Method,
-    Result,
-};
-use http::uri::Uri;
+use super::{fields::header_map_to_wasi, method::to_wasi_method, Error, Result};
 use wasi::http::outgoing_handler::OutgoingRequest;
 use wasi::http::types::Scheme;
 
-/// An HTTP request
-#[derive(Debug)]
-pub struct Request<B: Body> {
-    method: Method,
-    uri: Uri,
-    headers: HeaderMap,
-    body: B,
-}
-
-impl Request<Empty> {
-    /// Create a new HTTP request to send off to the client.
-    pub fn new(method: Method, uri: Uri) -> Self {
-        Self {
-            body: empty(),
-            method,
-            uri,
-            headers: HeaderMap::new(),
-        }
-    }
-}
-
-impl<B: Body> Request<B> {
-    /// Get the HTTP headers from the impl
-    pub fn headers(&self) -> &HeaderMap {
-        &self.headers
-    }
-
-    /// Mutably get the HTTP headers from the impl
-    pub fn headers_mut(&mut self) -> &mut HeaderMap {
-        &mut self.headers
-    }
-
-    /// Set an HTTP body.
-    pub fn set_body<C: IntoBody>(self, body: C) -> Request<C::IntoBody> {
-        let Self {
-            method,
-            uri,
-            headers,
-            ..
-        } = self;
-        Request {
-            method,
-            uri,
-            headers,
-            body: body.into_body(),
-        }
-    }
-
-    pub(crate) fn into_outgoing(self) -> Result<(OutgoingRequest, B)> {
-        let wasi_req = OutgoingRequest::new(header_map_to_wasi(&self.headers)?);
-
-        // Set the HTTP method
-        let method = to_wasi_method(self.method);
-        wasi_req
-            .set_method(&method)
-            .map_err(|()| Error::other(format!("method rejected by wasi-http: {method:?}",)))?;
-
-        // Set the url scheme
-        let scheme = match self.uri.scheme().map(|s| s.as_str()) {
-            Some("http") => Scheme::Http,
-            Some("https") | None => Scheme::Https,
-            Some(other) => Scheme::Other(other.to_owned()),
-        };
+pub use http::Request;
+
+pub(crate) fn into_outgoing<T>(request: Request<T>) -> Result<(OutgoingRequest, T)> {
+    let wasi_req = OutgoingRequest::new(header_map_to_wasi(request.headers())?);
+
+    let (parts, body) = request.into_parts();
+
+    // Set the HTTP method
+    let method = to_wasi_method(parts.method);
+    wasi_req
+        .set_method(&method)
+        .map_err(|()| Error::other(format!("method rejected by wasi-http: {method:?}",)))?;
+
+    // Set the url scheme
+    let scheme = match parts.uri.scheme().map(|s| s.as_str()) {
+        Some("http") => Scheme::Http,
+        Some("https") | None => Scheme::Https,
+        Some(other) => Scheme::Other(other.to_owned()),
+    };
+    wasi_req
+        .set_scheme(Some(&scheme))
+        .map_err(|()| Error::other(format!("scheme rejected by wasi-http: {scheme:?}")))?;
+
+    // Set authority
+    let authority = parts.uri.authority().map(|a| a.as_str());
+    wasi_req
+        .set_authority(authority)
+        .map_err(|()| Error::other(format!("authority rejected by wasi-http {authority:?}")))?;
+
+    // Set the url path + query string
+    if let Some(p_and_q) = parts.uri.path_and_query() {
         wasi_req
-            .set_scheme(Some(&scheme))
-            .map_err(|()| Error::other(format!("scheme rejected by wasi-http: {scheme:?}")))?;
-
-        // Set authority
-        let authority = self.uri.authority().map(|a| a.as_str());
-        wasi_req
-            .set_authority(authority)
-            .map_err(|()| Error::other(format!("authority rejected by wasi-http {authority:?}")))?;
-
-        // Set the url path + query string
-        if let Some(p_and_q) = self.uri.path_and_query() {
-            wasi_req
-                .set_path_with_query(Some(&p_and_q.to_string()))
-                .map_err(|()| {
-                    Error::other(format!("path and query rejected by wasi-http {p_and_q:?}"))
-                })?;
-        }
-
-        // All done; request is ready for send-off
-        Ok((wasi_req, self.body))
+            .set_path_with_query(Some(&p_and_q.to_string()))
+            .map_err(|()| {
+                Error::other(format!("path and query rejected by wasi-http {p_and_q:?}"))
+            })?;
     }
+
+    // All done; request is ready for send-off
+    Ok((wasi_req, body))
 }

src/http/response.rs

@@ -1,15 +1,10 @@
 use wasi::http::types::{IncomingBody as WasiIncomingBody, IncomingResponse};
 
-use super::{fields::header_map_from_wasi, Body, Error, HeaderMap, Result, StatusCode};
+use super::{fields::header_map_from_wasi, Body, Error, HeaderMap, Result};
 use crate::io::{AsyncInputStream, AsyncRead};
+use http::StatusCode;
 
-/// An HTTP response
-#[derive(Debug)]
-pub struct Response<B: Body> {
-    headers: HeaderMap,
-    status: StatusCode,
-    body: B,
-}
+pub use http::Response;
 
 #[derive(Debug)]
 enum BodyKind {
@@ -35,54 +30,39 @@ impl BodyKind {
     }
 }
 
-impl Response<IncomingBody> {
-    pub(crate) fn try_from_incoming_response(incoming: IncomingResponse) -> Result<Self> {
-        let headers: HeaderMap = header_map_from_wasi(incoming.headers())?;
-        let status = incoming.status().into();
+pub(crate) fn try_from_incoming_response(
+    incoming: IncomingResponse,
+) -> Result<Response<IncomingBody>> {
+    let headers: HeaderMap = header_map_from_wasi(incoming.headers())?;
+    // TODO: Does WASI guarantee that the incoming status is valid?
+    let status =
+        StatusCode::from_u16(incoming.status()).map_err(|err| Error::other(err.to_string()))?;
 
-        let kind = BodyKind::from_headers(&headers)?;
-        // `body_stream` is a child of `incoming_body` which means we cannot
-        // drop the parent before we drop the child
-        let incoming_body = incoming
-            .consume()
-            .expect("cannot call `consume` twice on incoming response");
-        let body_stream = incoming_body
-            .stream()
-            .expect("cannot call `stream` twice on an incoming body");
+    let kind = BodyKind::from_headers(&headers)?;
+    // `body_stream` is a child of `incoming_body` which means we cannot
+    // drop the parent before we drop the child
+    let incoming_body = incoming
+        .consume()
+        .expect("cannot call `consume` twice on incoming response");
+    let body_stream = incoming_body
+        .stream()
+        .expect("cannot call `stream` twice on an incoming body");
 
-        let body = IncomingBody {
-            kind,
-            body_stream: AsyncInputStream::new(body_stream),
-            _incoming_body: incoming_body,
-        };
+    let body = IncomingBody {
+        kind,
+        body_stream: AsyncInputStream::new(body_stream),
+        _incoming_body: incoming_body,
+    };
 
-        Ok(Self {
-            headers,
-            body,
-            status,
-        })
-    }
-}
+    let mut builder = Response::builder().status(status);
 
-impl<B: Body> Response<B> {
-    // Get the HTTP status code
-    pub fn status_code(&self) -> StatusCode {
-        self.status
+    if let Some(headers_mut) = builder.headers_mut() {
+        *headers_mut = headers;
     }
 
-    /// Get the HTTP headers from the impl
-    pub fn headers(&self) -> &HeaderMap {
-        &self.headers
-    }
-
-    /// Mutably get the HTTP headers from the impl
-    pub fn headers_mut(&mut self) -> &mut HeaderMap {
-        &mut self.headers
-    }
-
-    pub fn body(&mut self) -> &mut B {
-        &mut self.body
-    }
+    builder
+        .body(body)
+        .map_err(|err| Error::other(err.to_string()))
 }
 
 /// An incoming HTTP body