1 files changed, 83 insertions, 0 deletions
diff --git a/devtools/server/actors/process.js b/devtools/server/actors/process.js
new file mode 100644
index 000000000..ff1c4313f
--- /dev/null
+++ b/devtools/server/actors/process.js
@@ -0,0 +1,83 @@
+/* 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";
+
+var { Cc, Ci } = require("chrome");
+
+loader.lazyGetter(this, "ppmm", () => {
+  return Cc["@mozilla.org/parentprocessmessagemanager;1"].getService(Ci.nsIMessageBroadcaster);
+});
+
+function ProcessActorList() {
+  this._actors = new Map();
+  this._onListChanged = null;
+  this._mustNotify = false;
+
+  this._onMessage = this._onMessage.bind(this);
+  this._processScript = "data:text/javascript,sendAsyncMessage('debug:new-process');";
+}
+
+ProcessActorList.prototype = {
+  getList: function () {
+    let processes = [];
+    for (let i = 0; i < ppmm.childCount; i++) {
+      processes.push({
+        id: i, // XXX: may not be a perfect id, but process message manager doesn't expose anything...
+        parent: i == 0, // XXX Weak, but appear to be stable
+        tabCount: undefined, // TODO: exposes process message manager on frameloaders in order to compute this
+      });
+    }
+    this._mustNotify = true;
+    this._checkListening();
+
+    return processes;
+  },
+
+  get onListChanged() {
+    return this._onListChanged;
+  },
+
+  set onListChanged(onListChanged) {
+    if (typeof onListChanged !== "function" && onListChanged !== null) {
+      throw new Error("onListChanged must be either a function or null.");
+    }
+    if (onListChanged === this._onListChanged) {
+      return;
+    }
+
+    this._onListChanged = onListChanged;
+    this._checkListening();
+  },
+
+  _checkListening: function () {
+    if (this._onListChanged !== null && this._mustNotify) {
+      this._knownProcesses = [];
+      for (let i = 0; i < ppmm.childCount; i++) {
+        this._knownProcesses.push(ppmm.getChildAt(i));
+      }
+      ppmm.addMessageListener("debug:new-process", this._onMessage);
+      ppmm.loadProcessScript(this._processScript, true);
+    } else {
+      ppmm.removeMessageListener("debug:new-process", this._onMessage);
+      ppmm.removeDelayedProcessScript(this._processScript);
+    }
+  },
+
+  _notifyListChanged: function () {
+    if (this._mustNotify) {
+      this._onListChanged();
+      this._mustNotify = false;
+    }
+  },
+
+  _onMessage: function ({ target }) {
+    if (this._knownProcesses.includes(target)) {
+      return;
+    }
+    this._notifyListChanged();
+  },
+};
+
+exports.ProcessActorList = ProcessActorList;