1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/server/actors/targets/session-data-processors/breakpoints.js b/devtools/server/actors/targets/session-data-processors/breakpoints.js
new file mode 100644
index 0000000000..ff7cb7ec0a
--- /dev/null
+++ b/devtools/server/actors/targets/session-data-processors/breakpoints.js
@@ -0,0 +1,45 @@
+/* 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 {
+  STATES: THREAD_STATES,
+} = require("resource://devtools/server/actors/thread.js");
+
+module.exports = {
+  async addOrSetSessionDataEntry(
+    targetActor,
+    entries,
+    isDocumentCreation,
+    updateType
+  ) {
+    const { threadActor } = targetActor;
+    if (updateType == "set") {
+      threadActor.removeAllBreakpoints();
+    }
+    const isTargetCreation = threadActor.state == THREAD_STATES.DETACHED;
+    if (isTargetCreation && !targetActor.targetType.endsWith("worker")) {
+      // If addOrSetSessionDataEntry is called during target creation, attach the
+      // thread actor automatically and pass the initial breakpoints.
+      // However, do not attach the thread actor for Workers. They use a codepath
+      // which releases the worker on `attach`. For them, the client will call `attach`. (bug 1691986)
+      await threadActor.attach({ breakpoints: entries });
+    } else {
+      // If addOrSetSessionDataEntry is called for an existing target, set the new
+      // breakpoints on the already running thread actor.
+      await Promise.all(
+        entries.map(({ location, options }) =>
+          threadActor.setBreakpoint(location, options)
+        )
+      );
+    }
+  },
+
+  removeSessionDataEntry(targetActor, entries, isDocumentCreation) {
+    for (const { location } of entries) {
+      targetActor.threadActor.removeBreakpoint(location);
+    }
+  },
+};