1 files changed, 80 insertions, 0 deletions
diff --git a/devtools/shared/fronts/profiler.js b/devtools/shared/fronts/profiler.js
new file mode 100644
index 0000000000..f564513e3f
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+++ b/devtools/shared/fronts/profiler.js
@@ -0,0 +1,80 @@
+/* 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 { Cu } = require("chrome");
+const {
+  Front,
+  FrontClassWithSpec,
+  custom
+} = require("devtools/shared/protocol");
+const { profilerSpec } = require("devtools/shared/specs/profiler");
+
+loader.lazyRequireGetter(this, "events", "sdk/event/core");
+loader.lazyRequireGetter(this, "extend", "sdk/util/object", true);
+
+/**
+ * This can be used on older Profiler implementations, but the methods cannot
+ * be changed -- you must introduce a new method, and detect the server.
+ */
+exports.ProfilerFront = FrontClassWithSpec(profilerSpec, {
+  initialize: function (client, form) {
+    Front.prototype.initialize.call(this, client, form);
+    this.actorID = form.profilerActor;
+    this.manage(this);
+
+    this._onProfilerEvent = this._onProfilerEvent.bind(this);
+    events.on(this, "*", this._onProfilerEvent);
+  },
+
+  destroy: function () {
+    events.off(this, "*", this._onProfilerEvent);
+    Front.prototype.destroy.call(this);
+  },
+
+  /**
+   * If using the protocol.js Fronts, then make stringify default,
+   * since the read/write mechanisms will expose it as an object anyway, but
+   * this lets other consumers who connect directly (xpcshell tests, Gecko Profiler) to
+   * have unchanged behaviour.
+   */
+  getProfile: custom(function (options) {
+    return this._getProfile(extend({ stringify: true }, options));
+  }, {
+    impl: "_getProfile"
+  }),
+
+  /**
+   * Also emit an old `eventNotification` for older consumers of the profiler.
+   */
+  _onProfilerEvent: function (eventName, data) {
+    // If this event already passed through once, don't repropagate
+    if (data.relayed) {
+      return;
+    }
+    data.relayed = true;
+
+    if (eventName === "eventNotification") {
+      // If this is `eventNotification`, this is coming from an older Gecko (<Fx42)
+      // that doesn't use protocol.js style events. Massage it to emit a protocol.js
+      // style event as well.
+      events.emit(this, data.topic, data);
+    } else {
+      // Otherwise if a modern protocol.js event, emit it also as `eventNotification`
+      // for compatibility reasons on the client (like for any add-ons/Gecko Profiler
+      // using this event) and log a deprecation message if there is a listener.
+      this.conn.emit("eventNotification", {
+        subject: data.subject,
+        topic: data.topic,
+        data: data.data,
+        details: data.details
+      });
+      if (this.conn._getListeners("eventNotification").length) {
+        Cu.reportError(`
+          ProfilerActor's "eventNotification" on the DebuggerClient has been deprecated.
+          Use the ProfilerFront found in "devtools/server/actors/profiler".`);
+      }
+    }
+  },
+});