using alarm service intead of timeout api when the wallet is running in a service worker environment

1 files changed, 80 insertions, 0 deletions

diff --git a/packages/taler-wallet-webextension/src/serviceWorkerTimerAPI.ts b/packages/taler-wallet-webextension/src/serviceWorkerTimerAPI.ts
new file mode 100644
index 000000000..f2b6ee7a2
--- /dev/null
+++ b/packages/taler-wallet-webextension/src/serviceWorkerTimerAPI.ts
@@ -0,0 +1,80 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Imports.
+ */
+import { Duration, Logger } from "@gnu-taler/taler-util";
+import { TimerAPI, TimerGroup, TimerHandle } from "@gnu-taler/taler-wallet-core/src/util/timer";
+
+
+const nullTimerHandle = {
+  clear() {
+    // do nothing
+    return;
+  },
+  unref() {
+    // do nothing
+    return;
+  },
+};
+
+const logger = new Logger("ServiceWorkerTimerGroup.ts");
+/**
+ * Implementation of [[TimerAPI]] using alarm API
+ */
+export class ServiceWorkerTimerAPI implements TimerAPI {
+
+  /**
+   * Call a function every time the delay given in milliseconds passes.
+   */
+  every(delayMs: number, callback: () => void): TimerHandle {
+    const seconds = delayMs / 1000;
+    const periodInMinutes = Math.round(seconds < 61 ? 1 : seconds / 60);
+
+    chrome.alarms.create("wallet-worker", { periodInMinutes })
+    chrome.alarms.onAlarm.addListener(callback)
+
+    return new AlarmHandle();
+  }
+
+  /**
+   * Call a function after the delay given in milliseconds passes.
+   */
+  after(delayMs: number, callback: () => void): TimerHandle {
+    const seconds = delayMs / 1000;
+    const delayInMinutes = Math.round(seconds < 61 ? 1 : seconds / 60);
+
+    chrome.alarms.create("wallet-worker", { delayInMinutes })
+    chrome.alarms.onAlarm.addListener(callback)
+    return new AlarmHandle();
+  }
+
+}
+
+class AlarmHandle implements TimerHandle {
+
+  clear(): void {
+    chrome.alarms.clear("wallet-worker", (result) => {
+      logger.info(`Alarm 'wallet-worker' was cleared: ${result}`)
+    })
+    return;
+  }
+  unref(): void {
+    return;
+  }
+
+}