quic: add Http3Session, so you can explicitly pick the app protocol

benchmark/quic/h3-request.js

@@ -42,6 +42,7 @@ async function main({ mode, n }) {
     session.closed.catch(() => {});
     session.onstream = (stream) => { stream.closed.catch(() => {}); };
   }, {
+    alpn: ['h3'],
     sni: { '*': { keys: [key], certs: [cert] } },
     onheaders() {
       this.sendHeaders({ ':status': '200' });

lib/internal/quic/http3.js

@@ -0,0 +1,176 @@
+'use strict';
+
+const {
+  PromiseReject,
+} = primordials;
+
+const {
+  getOptionValue,
+} = require('internal/options');
+
+if (!process.features.quic || !getOptionValue('--experimental-quic')) {
+  return;
+}
+
+// Internal, experimental HTTP/3 layer over node:quic.
+//
+// An Http3Session is started on a QuicConnection that has no session yet,
+// and from then on the connection's streams are HTTP/3 request streams.
+
+const {
+  QuicSessionBase,
+  createApplicationStream,
+  getApplicationCallback,
+  getSessionConnection,
+  isServerConnection,
+  setApplicationCallback,
+} = require('internal/quic/quic');
+
+const {
+  kPrivateConstructor,
+} = require('internal/quic/symbols');
+const { kEmptyObject } = require('internal/util');
+
+const {
+  QUIC_APPLICATION_HTTP3,
+  STREAM_DIRECTION_BIDIRECTIONAL: kStreamDirectionBidirectional,
+} = internalBinding('quic');
+
+const {
+  validateBigIntOrInt,
+  validateBoolean,
+  validateFunction,
+  validateObject,
+} = require('internal/validators');
+
+const {
+  codes: {
+    ERR_INVALID_STATE,
+  },
+} = require('internal/errors');
+
+const kMaxUint64 = (1n << 64n) - 1n;
+
+function validateUint64Setting(value, name) {
+  if (value === undefined) return undefined;
+  return validateBigIntOrInt(value, `options.settings.${name}`, 0n, kMaxUint64);
+}
+
+function validateBooleanSetting(value, name) {
+  if (value !== undefined) validateBoolean(value, `options.settings.${name}`);
+  return value;
+}
+
+// Read each setting just once (they may be getters), then validate and return
+// them as a plain null-proto object:
+function prepareH3Settings(settings) {
+  const {
+    maxHeaderPairs,
+    maxHeaderLength,
+    maxFieldSectionSize,
+    qpackMaxDTableCapacity,
+    qpackEncoderMaxDTableCapacity,
+    qpackBlockedStreams,
+    enableConnectProtocol,
+    enableDatagrams,
+  } = settings;
+  return {
+    __proto__: null,
+    maxHeaderPairs: validateUint64Setting(maxHeaderPairs, 'maxHeaderPairs'),
+    maxHeaderLength: validateUint64Setting(maxHeaderLength, 'maxHeaderLength'),
+    maxFieldSectionSize:
+      validateUint64Setting(maxFieldSectionSize, 'maxFieldSectionSize'),
+    qpackMaxDTableCapacity:
+      validateUint64Setting(qpackMaxDTableCapacity, 'qpackMaxDTableCapacity'),
+    qpackEncoderMaxDTableCapacity: validateUint64Setting(
+      qpackEncoderMaxDTableCapacity, 'qpackEncoderMaxDTableCapacity'),
+    qpackBlockedStreams:
+      validateUint64Setting(qpackBlockedStreams, 'qpackBlockedStreams'),
+    enableConnectProtocol:
+      validateBooleanSetting(enableConnectProtocol, 'enableConnectProtocol'),
+    enableDatagrams: validateBooleanSetting(enableDatagrams, 'enableDatagrams'),
+  };
+}
+
+class Http3Session extends QuicSessionBase {
+  /**
+   * Starts HTTP/3 on a QuicConnection that has no session yet.
+   * @param {QuicConnection} connection
+   * @param {object} [options]
+   * @param {ApplicationOptions} [options.settings]
+   * @param {Function} [options.ongoaway]
+   * @param {Function} [options.onorigin]
+   * @param {Function} [options.onsettings]
+   * @returns {Http3Session}
+   */
+  static start(connection, options) {
+    return new Http3Session(kPrivateConstructor, connection, options);
+  }
+
+  constructor(privateSymbol, connection, options = kEmptyObject) {
+    validateObject(options, 'options');
+    const { ongoaway, onorigin, onsettings, settings } = options;
+    if (ongoaway !== undefined) validateFunction(ongoaway, 'options.ongoaway');
+    if (onorigin !== undefined) validateFunction(onorigin, 'options.onorigin');
+    if (onsettings !== undefined) {
+      validateFunction(onsettings, 'options.onsettings');
+    }
+    let preparedSettings;
+    if (settings !== undefined) {
+      validateObject(settings, 'options.settings');
+      preparedSettings = prepareH3Settings(settings);
+    }
+
+    // Reading settings could call getters and go into JS, so start after:
+    super(privateSymbol, connection, QUIC_APPLICATION_HTTP3, preparedSettings);
+
+    // User code could have patched setters, so we set directly:
+    if (ongoaway !== undefined) {
+      setApplicationCallback(connection, 'ongoaway', ongoaway, this);
+    }
+    if (onorigin !== undefined) {
+      setApplicationCallback(connection, 'onorigin', onorigin, this);
+    }
+    if (onsettings !== undefined) {
+      setApplicationCallback(connection, 'onapplication', onsettings, this, 'onsettings');
+    }
+  }
+
+  /**
+   * The settings in effect, including any update from the peer's SETTINGS
+   * frame, which may arrive after the session opens. Null once destroyed.
+   * @type {ApplicationOptions|null}
+   */
+  get settings() { return getSessionConnection(this).applicationOptions; }
+
+  /** @type {Function|undefined} */
+  get ongoaway() { return getApplicationCallback(getSessionConnection(this), 'ongoaway'); }
+  set ongoaway(fn) { setApplicationCallback(getSessionConnection(this), 'ongoaway', fn, this); }
+
+  /** @type {Function|undefined} */
+  get onorigin() { return getApplicationCallback(getSessionConnection(this), 'onorigin'); }
+  set onorigin(fn) { setApplicationCallback(getSessionConnection(this), 'onorigin', fn, this); }
+
+  /** @type {Function|undefined} */
+  get onsettings() { return getApplicationCallback(getSessionConnection(this), 'onapplication'); }
+  set onsettings(fn) {
+    setApplicationCallback(getSessionConnection(this), 'onapplication', fn, this, 'onsettings');
+  }
+
+  /**
+   * Opens a request stream.
+   * @returns {Promise<QuicStream>}
+   */
+  createBidirectionalStream(options) {
+    if (isServerConnection(getSessionConnection(this))) {
+      return PromiseReject(new ERR_INVALID_STATE(
+        'Server sessions cannot open HTTP/3 request streams'));
+    }
+    return createApplicationStream(
+      getSessionConnection(this), kStreamDirectionBidirectional, options);
+  }
+}
+
+module.exports = {
+  Http3Session,
+};