1 files changed, 256 insertions, 0 deletions
diff --git a/devtools/server/connectors/js-process-actor/DevToolsProcessParent.sys.mjs b/devtools/server/connectors/js-process-actor/DevToolsProcessParent.sys.mjs
new file mode 100644
index 0000000000..28e11def68
--- /dev/null
+++ b/devtools/server/connectors/js-process-actor/DevToolsProcessParent.sys.mjs
@@ -0,0 +1,256 @@
+/* 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 { loader } from "resource://devtools/shared/loader/Loader.sys.mjs";
+import { EventEmitter } from "resource://gre/modules/EventEmitter.sys.mjs";
+
+const { WatcherRegistry } = ChromeUtils.importESModule(
+  "resource://devtools/server/actors/watcher/WatcherRegistry.sys.mjs",
+  // WatcherRegistry needs to be a true singleton and loads ActorManagerParent
+  // which also has to be a true singleton.
+  { global: "shared" }
+);
+
+const lazy = {};
+loader.lazyRequireGetter(
+  lazy,
+  "JsWindowActorTransport",
+  "devtools/shared/transport/js-window-actor-transport",
+  true
+);
+
+export class DevToolsProcessParent extends JSProcessActorParent {
+  constructor() {
+    super();
+
+    this._destroyed = false;
+
+    // Map of DevToolsServerConnection's used to forward the messages from/to
+    // the client. The connections run in the parent process, as this code. We
+    // may have more than one when there is more than one client debugging the
+    // same frame. For example, a content toolbox and the browser toolbox.
+    //
+    // The map is indexed by the connection prefix.
+    // The values are objects containing the following properties:
+    // - actor: the frame target actor(as a form)
+    // - connection: the DevToolsServerConnection used to communicate with the
+    //   frame target actor
+    // - prefix: the forwarding prefix used by the connection to know
+    //   how to forward packets to the frame target
+    // - transport: the JsWindowActorTransport
+    //
+    // Reminder about prefixes: all DevToolsServerConnections have a `prefix`
+    // which can be considered as a kind of id. On top of this, parent process
+    // DevToolsServerConnections also have forwarding prefixes because they are
+    // responsible for forwarding messages to content process connections.
+    this._connections = new Map();
+
+    this._onConnectionClosed = this._onConnectionClosed.bind(this);
+    EventEmitter.decorate(this);
+  }
+
+  /**
+   * Request the content process to create the ContentProcessTarget
+   */
+  instantiateTarget({
+    watcherActorID,
+    connectionPrefix,
+    sessionContext,
+    sessionData,
+  }) {
+    return this.sendQuery(
+      "DevToolsProcessParent:instantiate-already-available",
+      {
+        watcherActorID,
+        connectionPrefix,
+        sessionContext,
+        sessionData,
+      }
+    );
+  }
+
+  destroyTarget({ watcherActorID, isModeSwitching }) {
+    this.sendAsyncMessage("DevToolsProcessParent:destroy", {
+      watcherActorID,
+      isModeSwitching,
+    });
+  }
+
+  /**
+   * Communicate to the content process that some data have been added.
+   */
+  addOrSetSessionDataEntry({ watcherActorID, type, entries, updateType }) {
+    return this.sendQuery("DevToolsProcessParent:addOrSetSessionDataEntry", {
+      watcherActorID,
+      type,
+      entries,
+      updateType,
+    });
+  }
+
+  /**
+   * Communicate to the content process that some data have been removed.
+   */
+  removeSessionDataEntry({ watcherActorID, type, entries }) {
+    this.sendAsyncMessage("DevToolsProcessParent:removeSessionDataEntry", {
+      watcherActorID,
+      type,
+      entries,
+    });
+  }
+
+  connectFromContent({ watcherActorID, forwardingPrefix, actor }) {
+    const watcher = WatcherRegistry.getWatcher(watcherActorID);
+
+    if (!watcher) {
+      throw new Error(
+        `Watcher Actor with ID '${watcherActorID}' can't be found.`
+      );
+    }
+    const connection = watcher.conn;
+
+    connection.on("closed", this._onConnectionClosed);
+
+    // Create a js-window-actor based transport.
+    const transport = new lazy.JsWindowActorTransport(
+      this,
+      forwardingPrefix,
+      "DevToolsProcessParent:packet"
+    );
+    transport.hooks = {
+      onPacket: connection.send.bind(connection),
+      onClosed() {},
+    };
+    transport.ready();
+
+    connection.setForwarding(forwardingPrefix, transport);
+
+    this._connections.set(watcher.conn.prefix, {
+      watcher,
+      connection,
+      // This prefix is the prefix of the DevToolsServerConnection, running
+      // in the content process, for which we should forward packets to, based on its prefix.
+      // While `watcher.connection` is also a DevToolsServerConnection, but from this process,
+      // the parent process. It is the one receiving Client packets and the one, from which
+      // we should forward packets from.
+      forwardingPrefix,
+      transport,
+      actor,
+    });
+
+    watcher.notifyTargetAvailable(actor);
+  }
+
+  _onConnectionClosed(status, prefix) {
+    if (this._connections.has(prefix)) {
+      const { connection } = this._connections.get(prefix);
+      this._cleanupConnection(connection);
+    }
+  }
+
+  /**
+   * Close and unregister a given DevToolsServerConnection.
+   *
+   * @param {DevToolsServerConnection} connection
+   * @param {object} options
+   * @param {boolean} options.isModeSwitching
+   *        true when this is called as the result of a change to the devtools.browsertoolbox.scope pref
+   */
+  async _cleanupConnection(connection, options = {}) {
+    const connectionInfo = this._connections.get(connection.prefix);
+    if (!connectionInfo) {
+      return;
+    }
+    const { forwardingPrefix, transport } = connectionInfo;
+
+    connection.off("closed", this._onConnectionClosed);
+    if (transport) {
+      // If we have a child transport, the actor has already
+      // been created. We need to stop using this transport.
+      transport.close(options);
+    }
+
+    this._connections.delete(connection.prefix);
+    if (!this._connections.size) {
+      this._destroy(options);
+    }
+
+    // When cancelling the forwarding, one RDP event is sent to the client to purge all requests
+    // and actors related to a given prefix. Do this *after* calling _destroy which will emit
+    // the target-destroyed RDP event. This helps the Watcher Front retrieve the related target front,
+    // otherwise it would be too eagerly destroyed by the purge event.
+    connection.cancelForwarding(forwardingPrefix);
+  }
+
+  /**
+   * Destroy and cleanup everything for this DOM Process.
+   *
+   * @param {object} options
+   * @param {boolean} options.isModeSwitching
+   *        true when this is called as the result of a change to the devtools.browsertoolbox.scope pref
+   */
+  _destroy(options) {
+    if (this._destroyed) {
+      return;
+    }
+    this._destroyed = true;
+
+    for (const { actor, connection, watcher } of this._connections.values()) {
+      watcher.notifyTargetDestroyed(actor, options);
+      this._cleanupConnection(connection, options);
+    }
+  }
+
+  /**
+   * Supported Queries
+   */
+
+  sendPacket(packet, prefix) {
+    this.sendAsyncMessage("DevToolsProcessParent:packet", { packet, prefix });
+  }
+
+  /**
+   * JsWindowActor API
+   */
+
+  async sendQuery(msg, args) {
+    try {
+      const res = await super.sendQuery(msg, args);
+      return res;
+    } catch (e) {
+      console.error("Failed to sendQuery in DevToolsProcessParent", msg);
+      console.error(e.toString());
+      throw e;
+    }
+  }
+
+  receiveMessage(message) {
+    switch (message.name) {
+      case "DevToolsProcessChild:connectFromContent":
+        return this.connectFromContent(message.data);
+      case "DevToolsProcessChild:packet":
+        return this.emit("packet-received", message);
+      case "DevToolsProcessChild:destroy":
+        for (const { form, watcherActorID } of message.data.actors) {
+          const watcher = WatcherRegistry.getWatcher(watcherActorID);
+          // As we instruct to destroy all targets when the watcher is destroyed,
+          // we may easily receive the target destruction notification *after*
+          // the watcher has been removed from the registry.
+          if (watcher) {
+            watcher.notifyTargetDestroyed(form, message.data.options);
+            this._cleanupConnection(watcher.conn, message.data.options);
+          }
+        }
+        return null;
+      default:
+        throw new Error(
+          "Unsupported message in DevToolsProcessParent: " + message.name
+        );
+    }
+  }
+
+  didDestroy() {
+    this._destroy();
+  }
+}