feat(ext/node): support http information

Author: devsnek

Cargo.lock

@@ -342,3 +342,6 @@ opt-level = 3
 opt-level = 3
 [profile.release.package.zstd-sys]
 opt-level = 3
+
+[patch.crates-io]
+hyper = { git = "https://github.com/hyperium/hyper.git", rev = "15227a3" }

Cargo.toml

@@ -370,6 +370,7 @@ deno_core::extension!(deno_node,
     ops::zlib::brotli::op_brotli_decompress_stream_end,
     ops::http::op_node_http_fetch_response_upgrade,
     ops::http::op_node_http_request_with_conn<P>,
+    ops::http::op_node_http_await_information,
     ops::http::op_node_http_await_response,
     ops::http2::op_http2_connect,
     ops::http2::op_http2_poll_client_connection,

ext/node/lib.rs

@@ -11,6 +11,7 @@ use std::task::Poll;
 
 use bytes::Bytes;
 use deno_core::error::ResourceError;
+use deno_core::futures::channel::mpsc;
 use deno_core::futures::stream::Peekable;
 use deno_core::futures::Future;
 use deno_core::futures::FutureExt;
@@ -70,9 +71,20 @@ pub struct NodeHttpResponse {
 type CancelableResponseResult =
   Result<Result<http::Response<Incoming>, hyper::Error>, Canceled>;
 
+#[derive(Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+struct InformationalResponse {
+  status: u16,
+  status_text: String,
+  headers: Vec<(ByteString, ByteString)>,
+  version_major: u16,
+  version_minor: u16,
+}
+
 pub struct NodeHttpClientResponse {
   response: Pin<Box<dyn Future<Output = CancelableResponseResult>>>,
   url: String,
+  informational_rx: RefCell<Option<mpsc::Receiver<InformationalResponse>>>,
 }
 
 impl Debug for NodeHttpClientResponse {
@@ -252,6 +264,36 @@ where
     request.headers_mut().insert(CONTENT_LENGTH, len.into());
   }
 
+  let (tx, informational_rx) = mpsc::channel(1);
+  hyper::ext::on_informational(&mut request, move |res| {
+    let mut tx = tx.clone();
+    let _ = tx.try_send(InformationalResponse {
+      status: res.status().as_u16(),
+      status_text: res.status().canonical_reason().unwrap_or("").to_string(),
+      headers: res
+        .headers()
+        .iter()
+        .map(|(k, v)| (k.as_str().into(), v.as_bytes().into()))
+        .collect(),
+      version_major: match res.version() {
+        hyper::Version::HTTP_09 => 0,
+        hyper::Version::HTTP_10 => 1,
+        hyper::Version::HTTP_11 => 1,
+        hyper::Version::HTTP_2 => 2,
+        hyper::Version::HTTP_3 => 3,
+        _ => unreachable!(),
+      },
+      version_minor: match res.version() {
+        hyper::Version::HTTP_09 => 9,
+        hyper::Version::HTTP_10 => 0,
+        hyper::Version::HTTP_11 => 1,
+        hyper::Version::HTTP_2 => 0,
+        hyper::Version::HTTP_3 => 0,
+        _ => unreachable!(),
+      },
+    });
+  });
+
   let cancel_handle = CancelHandle::new_rc();
   let cancel_handle_ = cancel_handle.clone();
 
@@ -264,6 +306,7 @@ where
     .add(NodeHttpClientResponse {
       response: Box::pin(fut),
       url: url.clone(),
+      informational_rx: RefCell::new(Some(informational_rx)),
     });
 
   let cancel_handle_rid = state
@@ -277,6 +320,27 @@ where
   })
 }
 
+#[op2(async)]
+#[serde]
+pub async fn op_node_http_await_information(
+  state: Rc<RefCell<OpState>>,
+  #[smi] rid: ResourceId,
+) -> Option<InformationalResponse> {
+  let Ok(resource) = state
+    .borrow_mut()
+    .resource_table
+    .get::<NodeHttpClientResponse>(rid)
+  else {
+    return None;
+  };
+
+  let mut rx = resource.informational_rx.borrow_mut().take()?;
+
+  drop(resource);
+
+  rx.next().await
+}
+
 #[op2(async)]
 #[serde]
 pub async fn op_node_http_await_response(

ext/node/ops/http.rs

@@ -5,6 +5,7 @@
 
 import { core, primordials } from "ext:core/mod.js";
 import {
+  op_node_http_await_information,
   op_node_http_await_response,
   op_node_http_fetch_response_upgrade,
   op_node_http_request_with_conn,
@@ -474,6 +475,44 @@ class ClientRequest extends OutgoingMessage {
           this._encrypted,
         );
         this._flushBuffer();
+
+        const infoPromise = op_node_http_await_information(
+          this._req!.requestRid,
+        );
+        core.unrefOpPromise(infoPromise);
+        infoPromise.then((info) => {
+          if (!info) return;
+
+          if (info.status === 100) this.emit("continue");
+
+          let headers;
+          let rawHeaders;
+
+          this.emit("information", {
+            statusCode: info.status,
+            statusMessage: info.statusText,
+            httpVersionMajor: info.versionMajor,
+            httpVersionMinor: info.versionMinor,
+            httpVersion: `${info.versionMajor}.${info.versionMinor}`,
+            get headers() {
+              if (!headers) {
+                headers = {};
+                for (let i = 0; i < info.headers.length; i++) {
+                  const entry = info.headers[i];
+                  headers[entry[0]] = entry[1];
+                }
+              }
+              return headers;
+            },
+            get rawHeaders() {
+              if (!rawHeaders) {
+                rawHeaders = info.headers.flat();
+              }
+              return rawHeaders;
+            },
+          });
+        });
+
         const res = await op_node_http_await_response(this._req!.requestRid);
         if (this._req.cancelHandleRid !== null) {
           core.tryClose(this._req.cancelHandleRid);
@@ -1610,6 +1649,12 @@ ServerResponse.prototype.detachSocket = function (
   this._socketOverride = null;
 };
 
+ServerResponse.prototype.writeContinue = function writeContinue(cb) {
+  if (cb) {
+    nextTick(cb);
+  }
+};
+
 Object.defineProperty(ServerResponse.prototype, "connection", {
   get: deprecate(
     function (this: ServerResponse) {
@@ -1815,7 +1860,24 @@ export class ServerImpl extends EventEmitter {
       } else {
         return new Promise<Response>((resolve): void => {
           const res = new ServerResponse(resolve, socket);
-          this.emit("request", req, res);
+
+          if (request.headers.has("expect")) {
+            if (/(?:^|\W)100-continue(?:$|\W)/i.test(req.headers.expect)) {
+              if (this.listenerCount("checkContinue") > 0) {
+                this.emit("checkContinue", req, res);
+              } else {
+                res.writeContinue();
+                this.emit("request", req, res);
+              }
+            } else if (this.listenerCount("checkExpectation") > 0) {
+              this.emit("checkExpectation", req, res);
+            } else {
+              res.writeHead(417);
+              res.end();
+            }
+          } else {
+            this.emit("request", req, res);
+          }
         });
       }
     };

ext/node/polyfills/http.ts

@@ -0,0 +1,4 @@
+{
+  "args": "run -A main.cjs",
+  "output": "ok\n"
+}