1 files changed, 117 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/pings/ModulesPing.sys.mjs b/toolkit/components/telemetry/pings/ModulesPing.sys.mjs
new file mode 100644
index 0000000000..a399a2829a
--- /dev/null
+++ b/toolkit/components/telemetry/pings/ModulesPing.sys.mjs
@@ -0,0 +1,117 @@
+/* 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 { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+import { Log } from "resource://gre/modules/Log.sys.mjs";
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  Preferences: "resource://gre/modules/Preferences.sys.mjs",
+  TelemetryController: "resource://gre/modules/TelemetryController.sys.mjs",
+});
+
+XPCOMUtils.defineLazyServiceGetter(
+  lazy,
+  "gUpdateTimerManager",
+  "@mozilla.org/updates/timer-manager;1",
+  "nsIUpdateTimerManager"
+);
+
+const LOGGER_NAME = "Toolkit.Telemetry";
+const LOGGER_PREFIX = "TelemetryModules::";
+
+// The default is 1 week.
+const MODULES_PING_INTERVAL_SECONDS = 7 * 24 * 60 * 60;
+const MODULES_PING_INTERVAL_PREFERENCE =
+  "toolkit.telemetry.modulesPing.interval";
+
+const MAX_MODULES_NUM = 512;
+const MAX_NAME_LENGTH = 64;
+const TRUNCATION_DELIMITER = "\u2026";
+
+export var TelemetryModules = Object.freeze({
+  _log: Log.repository.getLoggerWithMessagePrefix(LOGGER_NAME, LOGGER_PREFIX),
+
+  start() {
+    // The list of loaded modules is obtainable only when the profiler is enabled.
+    // If it isn't, we don't want to send the ping at all.
+    if (!AppConstants.MOZ_GECKO_PROFILER) {
+      return;
+    }
+
+    // Use nsIUpdateTimerManager for a long-duration timer that survives across sessions.
+    let interval = lazy.Preferences.get(
+      MODULES_PING_INTERVAL_PREFERENCE,
+      MODULES_PING_INTERVAL_SECONDS
+    );
+    lazy.gUpdateTimerManager.registerTimer(
+      "telemetry_modules_ping",
+      this,
+      interval,
+      interval != 0 // only skip the first interval if the interval is non-0
+    );
+  },
+
+  /**
+   * Called when the 'telemetry_modules_ping' timer fires.
+   */
+  notify() {
+    try {
+      Services.telemetry.getLoadedModules().then(
+        modules => {
+          modules = modules.filter(module => !!module.name.length);
+
+          // Cut the list of modules to MAX_MODULES_NUM entries.
+          if (modules.length > MAX_MODULES_NUM) {
+            modules = modules.slice(0, MAX_MODULES_NUM);
+          }
+
+          // Cut the file names of the modules to MAX_NAME_LENGTH characters.
+          for (let module of modules) {
+            if (module.name.length > MAX_NAME_LENGTH) {
+              module.name =
+                module.name.substr(0, MAX_NAME_LENGTH - 1) +
+                TRUNCATION_DELIMITER;
+            }
+
+            if (
+              module.debugName !== null &&
+              module.debugName.length > MAX_NAME_LENGTH
+            ) {
+              module.debugName =
+                module.debugName.substr(0, MAX_NAME_LENGTH - 1) +
+                TRUNCATION_DELIMITER;
+            }
+
+            if (
+              module.certSubject !== undefined &&
+              module.certSubject.length > MAX_NAME_LENGTH
+            ) {
+              module.certSubject =
+                module.certSubject.substr(0, MAX_NAME_LENGTH - 1) +
+                TRUNCATION_DELIMITER;
+            }
+          }
+
+          lazy.TelemetryController.submitExternalPing(
+            "modules",
+            {
+              version: 1,
+              modules,
+            },
+            {
+              addClientId: true,
+              addEnvironment: true,
+            }
+          );
+        },
+        err => this._log.error("notify - promise failed", err)
+      );
+    } catch (ex) {
+      this._log.error("notify - caught exception", ex);
+    }
+  },
+});