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-rw-r--r--remote/shared/WebSocketConnection.sys.mjs171
1 files changed, 171 insertions, 0 deletions
diff --git a/remote/shared/WebSocketConnection.sys.mjs b/remote/shared/WebSocketConnection.sys.mjs
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+++ b/remote/shared/WebSocketConnection.sys.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+ generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
+ Log: "chrome://remote/content/shared/Log.sys.mjs",
+ truncate: "chrome://remote/content/shared/Format.sys.mjs",
+ WebSocketTransport:
+ "chrome://remote/content/server/WebSocketTransport.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(lazy, "logger", () => lazy.Log.get());
+
+XPCOMUtils.defineLazyPreferenceGetter(
+ lazy,
+ "truncateLog",
+ "remote.log.truncate",
+ false
+);
+
+const MAX_LOG_LENGTH = 2500;
+
+export class WebSocketConnection {
+ /**
+ * @param {WebSocket} webSocket
+ * The WebSocket server connection to wrap.
+ * @param {Connection} httpdConnection
+ * Reference to the httpd.js's connection needed for clean-up.
+ */
+ constructor(webSocket, httpdConnection) {
+ this.id = lazy.generateUUID();
+
+ this.httpdConnection = httpdConnection;
+
+ this.transport = new lazy.WebSocketTransport(webSocket);
+ this.transport.hooks = this;
+ this.transport.ready();
+
+ lazy.logger.debug(`${this.constructor.name} ${this.id} accepted`);
+ }
+
+ #log(direction, data) {
+ if (lazy.Log.isDebugLevelOrMore) {
+ function replacer(key, value) {
+ if (typeof value === "string") {
+ return lazy.truncate`${value}`;
+ }
+ return value;
+ }
+
+ let payload = JSON.stringify(
+ data,
+ replacer,
+ lazy.Log.verbose ? "\t" : null
+ );
+
+ if (lazy.truncateLog && payload.length > MAX_LOG_LENGTH) {
+ // Even if we truncate individual values, the resulting message might be
+ // huge if we are serializing big objects with many properties or items.
+ // Truncate the overall message to avoid issues in logs.
+ const truncated = payload.substring(0, MAX_LOG_LENGTH);
+ payload = `${truncated} [... truncated after ${MAX_LOG_LENGTH} characters]`;
+ }
+
+ lazy.logger.debug(
+ `${this.constructor.name} ${this.id} ${direction} ${payload}`
+ );
+ }
+ }
+
+ /**
+ * Close the WebSocket connection.
+ */
+ close() {
+ this.transport.close();
+ }
+
+ /**
+ * Register a new Session to forward the messages to.
+ *
+ * Needs to be implemented in the sub class.
+ *
+ * @param {Session} session
+ * The session to register.
+ */
+ registerSession(session) {
+ throw new Error("Not implemented");
+ }
+
+ /**
+ * Send the JSON-serializable object to the client.
+ *
+ * @param {object} data
+ * The object to be sent.
+ */
+ send(data) {
+ this.#log("<-", data);
+ this.transport.send(data);
+ }
+
+ /**
+ * Send an error back to the client.
+ *
+ * Needs to be implemented in the sub class.
+ */
+ sendError() {
+ throw new Error("Not implemented");
+ }
+
+ /**
+ * Send an event back to the client.
+ *
+ * Needs to be implemented in the sub class.
+ */
+ sendEvent() {
+ throw new Error("Not implemented");
+ }
+
+ /**
+ * Send the result of a call to a method back to the client.
+ *
+ * Needs to be implemented in the sub class.
+ */
+ sendResult() {
+ throw new Error("Not implemented");
+ }
+
+ toString() {
+ return `[object ${this.constructor.name} ${this.id}]`;
+ }
+
+ // Transport hooks
+
+ /**
+ * Called by the `transport` when the connection is closed.
+ */
+ onConnectionClose(status) {
+ lazy.logger.debug(`${this.constructor.name} ${this.id} closed`);
+ }
+
+ /**
+ * Called when the socket is closed.
+ */
+ onSocketClose() {
+ // In addition to the WebSocket transport, we also have to close the
+ // connection used internally within httpd.js. Otherwise the server doesn't
+ // shut down correctly, and keeps these Connection instances alive.
+ this.httpdConnection.close();
+ }
+
+ /**
+ * Receive a packet from the WebSocket layer.
+ *
+ * This packet is sent by a WebSocket client and is meant to execute
+ * a particular method.
+ *
+ * Needs to be implemented in the sub class.
+ *
+ * @param {object} packet
+ * JSON-serializable object sent by the client.
+ */
+ async onPacket(packet) {
+ this.#log("->", packet);
+ }
+}