Bug 1286281 - Part 4: WebSocket-based debugger transport r=jryans

MozReview-Commit-ID: G4h7Z3KJTMA

.eslintignore

@@ -150,6 +150,7 @@ devtools/shared/tests/**
 devtools/shared/touch/**
 devtools/shared/transport/**
 !devtools/shared/transport/transport.js
+!devtools/shared/transport/websocket-transport.js
 devtools/shared/webconsole/test/**
 devtools/shared/worker/**
 !devtools/shared/worker/worker.js

devtools/shared/transport/moz.build

@@ -9,5 +9,6 @@ XPCSHELL_TESTS_MANIFESTS += ['tests/unit/xpcshell.ini']
 DevToolsModules(
     'packets.js',
     'stream-utils.js',
-    'transport.js'
+    'transport.js',
+    'websocket-transport.js',
 )

devtools/shared/transport/websocket-transport.js

@@ -0,0 +1,79 @@
+/* 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/. */
+
+"use strict";
+
+const EventEmitter = require("devtools/shared/event-emitter");
+
+function WebSocketDebuggerTransport(socket) {
+  EventEmitter.decorate(this);
+
+  this.active = false;
+  this.hooks = null;
+  this.socket = socket;
+}
+
+WebSocketDebuggerTransport.prototype = {
+  ready() {
+    if (this.active) {
+      return;
+    }
+
+    this.socket.addEventListener("message", this);
+    this.socket.addEventListener("close", this);
+
+    this.active = true;
+  },
+
+  send(object) {
+    this.emit("send", object);
+    if (this.socket) {
+      this.socket.send(JSON.stringify(object));
+    }
+  },
+
+  startBulkSend() {
+    throw new Error("Bulk send is not supported by WebSocket transport");
+  },
+
+  close() {
+    this.emit("onClosed");
+    this.active = false;
+
+    this.socket.removeEventListener("message", this);
+    this.socket.removeEventListener("close", this);
+    this.socket.close();
+    this.socket = null;
+
+    if (this.hooks) {
+      this.hooks.onClosed();
+      this.hooks = null;
+    }
+  },
+
+  handleEvent(event) {
+    switch (event.type) {
+      case "message":
+        this.onMessage(event);
+        break;
+      case "close":
+        this.close();
+        break;
+    }
+  },
+
+  onMessage({ data }) {
+    if (typeof data !== "string") {
+      throw new Error("Binary messages are not supported by WebSocket transport");
+    }
+
+    let object = JSON.parse(data);
+    this.emit("onPacket", object);
+    if (this.hooks) {
+      this.hooks.onPacket(object);
+    }
+  },
+};
+
+module.exports = WebSocketDebuggerTransport;