feat(ext/node): Very basic node:http2 support (#19344)

This commit adds basic support for "node:http2" module. Not
all APIs have been yet implemented, but this change already
allows to use this module for some basic functions. 

The "grpc" package is still not working, but it's a good stepping
stone.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

3 files changed, 346 insertions, 94 deletions

diff --git a/ext/http/00_serve.js b/ext/http/00_serve.js
index fa55079e7..c5a5c0e18 100644
--- a/ext/http/00_serve.js
+++ b/ext/http/00_serve.js
@@ -748,4 +748,10 @@ internals.upgradeHttpRaw = upgradeHttpRaw;
 internals.serveHttpOnListener = serveHttpOnListener;
 internals.serveHttpOnConnection = serveHttpOnConnection;
 
-export { serve, upgradeHttpRaw };
+export {
+  addTrailers,
+  serve,
+  serveHttpOnConnection,
+  serveHttpOnListener,
+  upgradeHttpRaw,
+};
diff --git a/ext/node/polyfills/http2.ts b/ext/node/polyfills/http2.ts
index 90b1be1a2..a5d945efe 100644
--- a/ext/node/polyfills/http2.ts
+++ b/ext/node/polyfills/http2.ts
@@ -1,12 +1,21 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 // Copyright Joyent and Node contributors. All rights reserved. MIT license.
 
-import { notImplemented } from "ext:deno_node/_utils.ts";
+import { notImplemented, warnNotImplemented } from "ext:deno_node/_utils.ts";
 import { EventEmitter } from "ext:deno_node/events.ts";
 import { Buffer } from "ext:deno_node/buffer.ts";
-import { Socket } from "ext:deno_node/net.ts";
+import { Server, Socket, TCP } from "ext:deno_node/net.ts";
 import { TypedArray } from "ext:deno_node/internal/util/types.ts";
+import { setStreamTimeout } from "ext:deno_node/internal/stream_base_commons.ts";
 import { FileHandle } from "ext:deno_node/fs/promises.ts";
+import { kStreamBaseField } from "ext:deno_node/internal_binding/stream_wrap.ts";
+import { addTrailers, serveHttpOnConnection } from "ext:deno_http/00_serve.js";
+import { type Deferred, deferred } from "ext:deno_node/_util/async.ts";
+import { nextTick } from "ext:deno_node/_next_tick.ts";
+import { TextEncoder } from "ext:deno_web/08_text_encoding.js";
+
+const ENCODER = new TextEncoder();
+type Http2Headers = Record<string, string | string[]>;
 
 export class Http2Session extends EventEmitter {
   constructor() {
@@ -19,11 +28,10 @@ export class Http2Session extends EventEmitter {
   }
 
   close(_callback?: () => void) {
-    notImplemented("Http2Session.close");
+    warnNotImplemented("Http2Session.close");
   }
 
   get closed(): boolean {
-    notImplemented("Http2Session.closed");
     return false;
   }
 
@@ -37,7 +45,6 @@ export class Http2Session extends EventEmitter {
   }
 
   get destroyed(): boolean {
-    notImplemented("Http2Session.destroyed");
     return false;
   }
 
@@ -78,7 +85,7 @@ export class Http2Session extends EventEmitter {
   }
 
   ref() {
-    notImplemented("Http2Session.ref");
+    warnNotImplemented("Http2Session.ref");
   }
 
   get remoteSettings(): Record<string, unknown> {
@@ -90,17 +97,15 @@ export class Http2Session extends EventEmitter {
     notImplemented("Http2Session.setLocalWindowSize");
   }
 
-  setTimeout(_msecs: number, _callback: () => void) {
-    notImplemented("Http2Session.setTimeout");
+  setTimeout(msecs: number, callback?: () => void) {
+    setStreamTimeout(this, msecs, callback);
   }
 
   get socket(): Socket /*| TlsSocket*/ {
-    notImplemented("Http2Session.socket");
-    return null;
+    return {};
   }
 
   get state(): Record<string, unknown> {
-    notImplemented("Http2Session.state");
     return {};
   }
 
@@ -114,7 +119,7 @@ export class Http2Session extends EventEmitter {
   }
 
   unref() {
-    notImplemented("Http2Session.unref");
+    warnNotImplemented("Http2Session.unref");
   }
 }
 
@@ -136,21 +141,131 @@ export class ServerHttp2Session extends Http2Session {
 }
 
 export class ClientHttp2Session extends Http2Session {
-  constructor() {
+  constructor(
+    _authority: string | URL,
+    _options: Record<string, unknown>,
+    callback: (session: Http2Session) => void,
+  ) {
     super();
+    if (callback) {
+      this.on("connect", callback);
+    }
+    nextTick(() => this.emit("connect", this));
   }
 
   request(
-    _headers: Record<string, unknown>,
+    headers: Http2Headers,
     _options?: Record<string, unknown>,
   ): ClientHttp2Stream {
-    notImplemented("ClientHttp2Session.request");
-    return new ClientHttp2Stream();
+    const reqHeaders: string[][] = [];
+    const controllerPromise: Deferred<
+      ReadableStreamDefaultController<Uint8Array>
+    > = deferred();
+    const body = new ReadableStream({
+      start(controller) {
+        controllerPromise.resolve(controller);
+      },
+    });
+    const request: RequestInit = { headers: reqHeaders, body };
+    let authority = null;
+    let path = null;
+    for (const [name, value] of Object.entries(headers)) {
+      if (name == constants.HTTP2_HEADER_PATH) {
+        path = String(value);
+      } else if (name == constants.HTTP2_HEADER_METHOD) {
+        request.method = String(value);
+      } else if (name == constants.HTTP2_HEADER_AUTHORITY) {
+        authority = String(value);
+      } else {
+        reqHeaders.push([name, String(value)]);
+      }
+    }
+
+    const fetchPromise = fetch(`http://${authority}${path}`, request);
+    const readerPromise = deferred();
+    const headersPromise = deferred();
+    (async () => {
+      const fetch = await fetchPromise;
+      readerPromise.resolve(fetch.body);
+
+      const headers: Http2Headers = {};
+      for (const [key, value] of fetch.headers) {
+        headers[key] = value;
+      }
+      headers[constants.HTTP2_HEADER_STATUS] = String(fetch.status);
+
+      headersPromise.resolve(headers);
+    })();
+    return new ClientHttp2Stream(
+      this,
+      headersPromise,
+      controllerPromise,
+      readerPromise,
+    );
   }
 }
 
-export class Http2Stream {
-  constructor() {
+export class Http2Stream extends EventEmitter {
+  #session: Http2Session;
+  #headers: Deferred<Http2Headers>;
+  #controllerPromise: Deferred<ReadableStreamDefaultController<Uint8Array>>;
+  #readerPromise: Deferred<ReadableStream<Uint8Array>>;
+  #closed: boolean;
+  _response: Response;
+
+  constructor(
+    session: Http2Session,
+    headers: Promise<Http2Headers>,
+    controllerPromise: Promise<ReadableStreamDefaultController<Uint8Array>>,
+    readerPromise: Promise<ReadableStream<Uint8Array>>,
+  ) {
+    super();
+    this.#session = session;
+    this.#headers = headers;
+    this.#controllerPromise = controllerPromise;
+    this.#readerPromise = readerPromise;
+    this.#closed = false;
+    nextTick(() => {
+      (async () => {
+        const headers = await this.#headers;
+        this.emit("headers", headers);
+      })();
+      (async () => {
+        const reader = await this.#readerPromise;
+        if (reader) {
+          for await (const data of reader) {
+            this.emit("data", new Buffer(data));
+          }
+        }
+        this.emit("end");
+      })();
+    });
+  }
+
+  // TODO(mmastrac): Implement duplex
+  end() {
+    (async () => {
+      const controller = await this.#controllerPromise;
+      controller.close();
+    })();
+  }
+
+  write(buffer, callback?: () => void) {
+    (async () => {
+      const controller = await this.#controllerPromise;
+      if (typeof buffer === "string") {
+        controller.enqueue(ENCODER.encode(buffer));
+      } else {
+        controller.enqueue(buffer);
+      }
+      callback?.();
+    })();
+  }
+
+  resume() {
+  }
+
+  pause() {
   }
 
   get aborted(): boolean {
@@ -164,16 +279,15 @@ export class Http2Stream {
   }
 
   close(_code: number, _callback: () => void) {
-    notImplemented("Http2Stream.close");
+    this.#closed = true;
+    this.emit("close");
   }
 
   get closed(): boolean {
-    notImplemented("Http2Stream.closed");
-    return false;
+    return this.#closed;
   }
 
   get destroyed(): boolean {
-    notImplemented("Http2Stream.destroyed");
     return false;
   }
 
@@ -197,7 +311,7 @@ export class Http2Stream {
   }
 
   get rstCode(): number {
-    notImplemented("Http2Stream.rstCode");
+    // notImplemented("Http2Stream.rstCode");
     return 0;
   }
 
@@ -217,12 +331,11 @@ export class Http2Stream {
   }
 
   get session(): Http2Session {
-    notImplemented("Http2Stream.session");
-    return new Http2Session();
+    return this.#session;
   }
 
-  setTimeout(_msecs: number, _callback: () => void) {
-    notImplemented("Http2Stream.setTimeout");
+  setTimeout(msecs: number, callback?: () => void) {
+    setStreamTimeout(this, msecs, callback);
   }
 
   get state(): Record<string, unknown> {
@@ -231,28 +344,52 @@ export class Http2Stream {
   }
 
   sendTrailers(_headers: Record<string, unknown>) {
-    notImplemented("Http2Stream.sendTrailers");
+    addTrailers(this._response, [["grpc-status", "0"], ["grpc-message", "OK"]]);
   }
 }
 
 export class ClientHttp2Stream extends Http2Stream {
-  constructor() {
-    super();
+  constructor(
+    session: Http2Session,
+    headers: Promise<Http2Headers>,
+    controllerPromise: Deferred<ReadableStreamDefaultController<Uint8Array>>,
+    readerPromise: Deferred<ReadableStream<Uint8Array>>,
+  ) {
+    super(session, headers, controllerPromise, readerPromise);
   }
 }
 
 export class ServerHttp2Stream extends Http2Stream {
-  constructor() {
-    super();
+  _promise: Deferred<Response>;
+  #body: ReadableStream<Uint8Array>;
+  #waitForTrailers: boolean;
+  #headersSent: boolean;
+
+  constructor(
+    session: Http2Session,
+    headers: Promise<Http2Headers>,
+    controllerPromise: Promise<ReadableStreamDefaultController<Uint8Array>>,
+    reader: ReadableStream<Uint8Array>,
+    body: ReadableStream<Uint8Array>,
+  ) {
+    super(session, headers, controllerPromise, Promise.resolve(reader));
+    this._promise = new deferred();
+    this.#body = body;
   }
 
   additionalHeaders(_headers: Record<string, unknown>) {
     notImplemented("ServerHttp2Stream.additionalHeaders");
   }
 
+  end(): void {
+    super.end();
+    if (this.#waitForTrailers) {
+      this.emit("wantTrailers");
+    }
+  }
+
   get headersSent(): boolean {
-    notImplemented("ServerHttp2Stream.headersSent");
-    return false;
+    return this.#headersSent;
   }
 
   get pushAllowed(): boolean {
@@ -269,10 +406,26 @@ export class ServerHttp2Stream extends Http2Stream {
   }
 
   respond(
-    _headers: Record<string, unknown>,
-    _options: Record<string, unknown>,
+    headers: Http2Headers,
+    options: Record<string, unknown>,
   ) {
-    notImplemented("ServerHttp2Stream.respond");
+    this.#headersSent = true;
+    const response: ResponseInit = {};
+    if (headers) {
+      for (const [name, value] of Object.entries(headers)) {
+        if (name == constants.HTTP2_HEADER_STATUS) {
+          response.status = Number(value);
+        }
+      }
+    }
+    if (options?.endStream) {
+      this._promise.resolve(this._response = new Response("", response));
+    } else {
+      this.#waitForTrailers = options?.waitForTrailers;
+      this._promise.resolve(
+        this._response = new Response(this.#body, response),
+      );
+    }
   }
 
   respondWithFD(
@@ -292,56 +445,145 @@ export class ServerHttp2Stream extends Http2Stream {
   }
 }
 
-export class Http2Server {
-  constructor() {
-  }
-
-  close(_callback?: () => unknown) {
-    notImplemented("Http2Server.close");
-  }
+export class Http2Server extends Server {
+  #options: Record<string, unknown> = {};
+  #abortController;
+  #server;
+  timeout = 0;
 
-  setTimeout(_msecs: number, _callback?: () => unknown) {
-    notImplemented("Http2Server.setTimeout");
-  }
-
-  get timeout(): number {
-    notImplemented("Http2Server.timeout");
-    return 0;
-  }
-
-  updateSettings(_settings: Record<string, unknown>) {
-    notImplemented("Http2Server.updateSettings");
+  constructor(
+    options: Record<string, unknown>,
+    requestListener: () => unknown,
+  ) {
+    super(options);
+    this.#abortController = new AbortController();
+    this.on(
+      "connection",
+      (conn: Deno.Conn) => {
+        try {
+          const session = new ServerHttp2Session();
+          this.emit("session", session);
+          this.#server = serveHttpOnConnection(
+            conn,
+            this.#abortController.signal,
+            async (req: Request) => {
+              try {
+                const controllerPromise: Deferred<
+                  ReadableStreamDefaultController<Uint8Array>
+                > = deferred();
+                const body = new ReadableStream({
+                  start(controller) {
+                    controllerPromise.resolve(controller);
+                  },
+                });
+                const headers: Http2Headers = {};
+                for (const [name, value] of req.headers) {
+                  headers[name] = value;
+                }
+                headers[constants.HTTP2_HEADER_PATH] =
+                  new URL(req.url).pathname;
+                const stream = new ServerHttp2Stream(
+                  session,
+                  Promise.resolve(headers),
+                  controllerPromise,
+                  req.body,
+                  body,
+                );
+                session.emit("stream", stream, headers);
+                this.emit("stream", stream, headers);
+                return await stream._promise;
+              } catch (e) {
+                console.log("Error in serveHttpOnConnection", e);
+              }
+              return new Response("");
+            },
+            () => {
+              console.log("error");
+            },
+            () => {},
+          );
+        } catch (e) {
+          console.log("Error in Http2Server", e);
+        }
+      },
+    );
+    this.on(
+      "newListener",
+      (event) => console.log(`Event in newListener: ${event}`),
+    );
+    this.#options = options;
+    if (typeof requestListener === "function") {
+      this.on("request", requestListener);
+    }
+  }
+
+  // Prevent the TCP server from wrapping this in a socket, since we need it to serve HTTP
+  _createSocket(clientHandle: TCP) {
+    return clientHandle[kStreamBaseField];
+  }
+
+  close(callback?: () => unknown) {
+    if (callback) {
+      this.on("close", callback);
+    }
+    this.#abortController.abort();
+    super.close();
+  }
+
+  setTimeout(msecs: number, callback?: () => unknown) {
+    this.timeout = msecs;
+    if (callback !== undefined) {
+      this.on("timeout", callback);
+    }
+  }
+
+  updateSettings(settings: Record<string, unknown>) {
+    this.#options.settings = { ...this.#options.settings, ...settings };
   }
 }
 
-export class Http2SecureServer {
-  constructor() {
+export class Http2SecureServer extends Server {
+  #options: Record<string, unknown> = {};
+  timeout = 0;
+
+  constructor(
+    options: Record<string, unknown>,
+    requestListener: () => unknown,
+  ) {
+    super(options, function () {
+      notImplemented("connectionListener");
+    });
+    this.#options = options;
+    if (typeof requestListener === "function") {
+      this.on("request", requestListener);
+    }
   }
 
   close(_callback?: () => unknown) {
     notImplemented("Http2SecureServer.close");
   }
 
-  setTimeout(_msecs: number, _callback?: () => unknown) {
-    notImplemented("Http2SecureServer.setTimeout");
-  }
-
-  get timeout(): number {
-    notImplemented("Http2SecureServer.timeout");
-    return 0;
+  setTimeout(msecs: number, callback?: () => unknown) {
+    this.timeout = msecs;
+    if (callback !== undefined) {
+      this.on("timeout", callback);
+    }
   }
 
-  updateSettings(_settings: Record<string, unknown>) {
-    notImplemented("Http2SecureServer.updateSettings");
+  updateSettings(settings: Record<string, unknown>) {
+    this.#options.settings = { ...this.#options.settings, ...settings };
   }
 }
 
 export function createServer(
-  _options: Record<string, unknown>,
-  _onRequestHandler: () => unknown,
+  options: Record<string, unknown>,
+  onRequestHandler: () => unknown,
 ): Http2Server {
-  notImplemented("http2.createServer");
-  return new Http2Server();
+  if (typeof options === "function") {
+    onRequestHandler = options;
+    options = {};
+  }
+  return new Http2Server(options, onRequestHandler);
 }
 
 export function createSecureServer(
@@ -353,11 +595,11 @@ export function createSecureServer(
 }
 
 export function connect(
-  _authority: string | URL,
-  _options: Record<string, unknown>,
+  authority: string | URL,
+  options: Record<string, unknown>,
+  callback: (session: ClientHttp2Session) => void,
 ): ClientHttp2Session {
-  notImplemented("http2.connect");
-  return new ClientHttp2Session();
+  return new ClientHttp2Session(authority, options, callback);
 }
 
 export const constants = {
@@ -681,8 +923,8 @@ export class Http2ServerRequest {
     return "";
   }
 
-  setTimeout(_msecs: number, _callback: () => unknown) {
-    notImplemented("Http2ServerRequest.setTimeout");
+  setTimeout(msecs: number, callback?: () => unknown) {
+    this.stream.setTimeout(callback, msecs);
   }
 
   get socket(): Socket /*| TlsSocket*/ {
@@ -781,8 +1023,8 @@ export class Http2ServerResponse {
     notImplemented("Http2ServerResponse.setHeader");
   }
 
-  setTimeout(_msecs: number, _callback: () => unknown) {
-    notImplemented("Http2ServerResponse.setTimeout");
+  setTimeout(msecs: number, callback?: () => unknown) {
+    this.stream.setTimeout(msecs, callback);
   }
 
   get socket(): Socket /*| TlsSocket*/ {
diff --git a/ext/node/polyfills/net.ts b/ext/node/polyfills/net.ts
index 2c2f5f944..79845adb2 100644
--- a/ext/node/polyfills/net.ts
+++ b/ext/node/polyfills/net.ts
@@ -1834,21 +1834,8 @@ function _onconnection(this: any, err: number, clientHandle?: Handle) {
     return;
   }
 
-  const socket = new Socket({
-    handle: clientHandle,
-    allowHalfOpen: self.allowHalfOpen,
-    pauseOnCreate: self.pauseOnConnect,
-    readable: true,
-    writable: true,
-  });
-
-  // TODO(@bartlomieju): implement noDelay and setKeepAlive
-
-  self._connections++;
-  socket.server = self;
-  socket._server = self;
-
-  DTRACE_NET_SERVER_CONNECTION(socket);
+  const socket = self._createSocket(clientHandle);
+  this._connections++;
   self.emit("connection", socket);
 
   if (netServerSocketChannel.hasSubscribers) {
@@ -2369,6 +2356,23 @@ export class Server extends EventEmitter {
     return !!this._handle;
   }
 
+  _createSocket(clientHandle) {
+    const socket = new Socket({
+      handle: clientHandle,
+      allowHalfOpen: this.allowHalfOpen,
+      pauseOnCreate: this.pauseOnConnect,
+      readable: true,
+      writable: true,
+    });
+
+    // TODO(@bartlomieju): implement noDelay and setKeepAlive
+
+    socket.server = this;
+    socket._server = this;
+
+    DTRACE_NET_SERVER_CONNECTION(socket);
+  }
+
   _listen2 = _setupListenHandle;
 
   _emitCloseIfDrained() {