1 files changed, 104 insertions, 0 deletions
diff --git a/devtools/server/startup/content-process.sys.mjs b/devtools/server/startup/content-process.sys.mjs
new file mode 100644
index 0000000000..fd974e8c4a
--- /dev/null
+++ b/devtools/server/startup/content-process.sys.mjs
@@ -0,0 +1,104 @@
+/* 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/. */
+
+/*
+ * Module that listens for requests to start a `DevToolsServer` for an entire content
+ * process.  Loaded into content processes by the main process during
+ * content-process-connector.js' `connectToContentProcess` via the process
+ * script `content-process.js`.
+ *
+ * The actual server startup itself is in this JSM so that code can be cached.
+ */
+
+export function initContentProcessTarget(msg) {
+  const mm = msg.target;
+  const prefix = msg.data.prefix;
+  const watcherActorID = msg.data.watcherActorID;
+
+  // Lazy load Loader.sys.mjs to prevent loading any devtools dependency too early.
+  const {
+    useDistinctSystemPrincipalLoader,
+    releaseDistinctSystemPrincipalLoader,
+  } = ChromeUtils.importESModule(
+    "resource://devtools/shared/loader/DistinctSystemPrincipalLoader.sys.mjs"
+  );
+
+  // Use a unique object to identify this one usage of the loader
+  const loaderRequester = {};
+
+  // Init a custom, invisible DevToolsServer, in order to not pollute the
+  // debugger with all devtools modules, nor break the debugger itself with
+  // using it in the same process.
+  const loader = useDistinctSystemPrincipalLoader(loaderRequester);
+
+  const { DevToolsServer } = loader.require(
+    "resource://devtools/server/devtools-server.js"
+  );
+
+  DevToolsServer.init();
+  // For browser content toolbox, we do need a regular root actor and all tab
+  // actors, but don't need all the "browser actors" that are only useful when
+  // debugging the parent process via the browser toolbox.
+  DevToolsServer.registerActors({ root: true, target: true });
+
+  // Connect both parent/child processes devtools servers RDP via message
+  // managers
+  const conn = DevToolsServer.connectToParent(prefix, mm);
+
+  const { ContentProcessTargetActor } = loader.require(
+    "resource://devtools/server/actors/targets/content-process.js"
+  );
+
+  const actor = new ContentProcessTargetActor(conn, {
+    sessionContext: msg.data.sessionContext,
+  });
+  actor.manage(actor);
+
+  const response = { watcherActorID, prefix, actor: actor.form() };
+  mm.sendAsyncMessage("debug:content-process-actor", response);
+
+  function onDestroy(options) {
+    mm.removeMessageListener(
+      "debug:content-process-disconnect",
+      onContentProcessDisconnect
+    );
+    actor.off("destroyed", onDestroy);
+
+    // Notify the parent process that the actor is being destroyed
+    mm.sendAsyncMessage("debug:content-process-actor-destroyed", {
+      watcherActorID,
+    });
+
+    // Call DevToolsServerConnection.close to destroy all child actors. It should end up
+    // calling DevToolsServerConnection.onTransportClosed that would actually cleanup all actor
+    // pools.
+    conn.close(options);
+
+    // Destroy the related loader when the target is destroyed
+    // and we were the last user of the special loader
+    releaseDistinctSystemPrincipalLoader(loaderRequester);
+  }
+  function onContentProcessDisconnect(message) {
+    if (message.data.prefix != prefix) {
+      // Several copies of this process script can be running for a single process if
+      // we are debugging the same process from multiple clients.
+      // If this disconnect request doesn't match a connection known here, ignore it.
+      return;
+    }
+    onDestroy();
+  }
+
+  // Clean up things when the client disconnects
+  mm.addMessageListener(
+    "debug:content-process-disconnect",
+    onContentProcessDisconnect
+  );
+  // And also when the target actor is destroyed
+  actor.on("destroyed", onDestroy);
+
+  return {
+    actor,
+    connection: conn,
+  };
+}