1 files changed, 38 insertions, 0 deletions
diff --git a/devtools/client/application/src/middleware/event-telemetry.js b/devtools/client/application/src/middleware/event-telemetry.js
new file mode 100644
index 0000000000..27351663c7
--- /dev/null
+++ b/devtools/client/application/src/middleware/event-telemetry.js
@@ -0,0 +1,38 @@
+/* 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 {
+  START_WORKER,
+  UNREGISTER_WORKER,
+  UPDATE_SELECTED_PAGE,
+} = require("devtools/client/application/src/constants.js");
+
+function eventTelemetryMiddleware(telemetry, sessionId) {
+  function recordEvent(method, details = {}) {
+    const eventDetails = Object.assign({}, details, { session_id: sessionId });
+    telemetry.recordEvent(method, "application", null, eventDetails);
+  }
+
+  return store => next => action => {
+    switch (action.type) {
+      // ui telemetry
+      case UPDATE_SELECTED_PAGE:
+        recordEvent("select_page", { page_type: action.selectedPage });
+        break;
+      // service-worker related telemetry
+      case UNREGISTER_WORKER:
+        recordEvent("unregister_worker");
+        break;
+      case START_WORKER:
+        recordEvent("start_worker");
+        break;
+    }
+
+    return next(action);
+  };
+}
+
+module.exports = eventTelemetryMiddleware;