From ffd2a62c3f7df94365980302fef3bc3376b48182 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 3 Aug 2020 13:00:48 +0530
Subject: modularize repo, use pnpm, improve typechecking

---
 packages/taler-wallet-core/src/util/timer.ts | 165 +++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 packages/taler-wallet-core/src/util/timer.ts

(limited to 'packages/taler-wallet-core/src/util/timer.ts')

diff --git a/packages/taler-wallet-core/src/util/timer.ts b/packages/taler-wallet-core/src/util/timer.ts
new file mode 100644
index 000000000..8eab1399c
--- /dev/null
+++ b/packages/taler-wallet-core/src/util/timer.ts
@@ -0,0 +1,165 @@
+/*
+ This file is part of GNU Taler
+ (C) 2017-2019 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/>
+ */
+
+/**
+ * Cross-platform timers.
+ *
+ * NodeJS and the browser use slightly different timer API,
+ * this abstracts over these differences.
+ */
+
+/**
+ * Imports.
+ */
+import { Duration } from "./time";
+import { Logger } from "./logging";
+
+const logger = new Logger("timer.ts");
+
+/**
+ * Cancelable timer.
+ */
+export interface TimerHandle {
+  clear(): void;
+}
+
+class IntervalHandle {
+  constructor(public h: any) {}
+
+  clear(): void {
+    clearInterval(this.h);
+  }
+}
+
+class TimeoutHandle {
+  constructor(public h: any) {}
+
+  clear(): void {
+    clearTimeout(this.h);
+  }
+}
+
+/**
+ * Get a performance counter in milliseconds.
+ */
+export const performanceNow: () => number = (() => {
+  // @ts-ignore
+  if (typeof process !== "undefined" && process.hrtime) {
+    return () => {
+      const t = process.hrtime();
+      return t[0] * 1e9 + t[1];
+    };
+  }
+
+  // @ts-ignore
+  if (typeof performance !== "undefined") {
+    // @ts-ignore
+    return () => performance.now();
+  }
+
+  return () => 0;
+})();
+
+/**
+ * Call a function every time the delay given in milliseconds passes.
+ */
+export function every(delayMs: number, callback: () => void): TimerHandle {
+  return new IntervalHandle(setInterval(callback, delayMs));
+}
+
+/**
+ * Call a function after the delay given in milliseconds passes.
+ */
+export function after(delayMs: number, callback: () => void): TimerHandle {
+  return new TimeoutHandle(setTimeout(callback, delayMs));
+}
+
+const nullTimerHandle = {
+  clear() {
+    // do nothing
+    return;
+  },
+};
+
+/**
+ * Group of timers that can be destroyed at once.
+ */
+export class TimerGroup {
+  private stopped = false;
+
+  private timerMap: { [index: number]: TimerHandle } = {};
+
+  private idGen = 1;
+
+  stopCurrentAndFutureTimers(): void {
+    this.stopped = true;
+    for (const x in this.timerMap) {
+      if (!this.timerMap.hasOwnProperty(x)) {
+        continue;
+      }
+      this.timerMap[x].clear();
+      delete this.timerMap[x];
+    }
+  }
+
+  resolveAfter(delayMs: Duration): Promise<void> {
+    return new Promise<void>((resolve, reject) => {
+      if (delayMs.d_ms !== "forever") {
+        this.after(delayMs.d_ms, () => {
+          resolve();
+        });
+      }
+    });
+  }
+
+  after(delayMs: number, callback: () => void): TimerHandle {
+    if (this.stopped) {
+      logger.warn("dropping timer since timer group is stopped");
+      return nullTimerHandle;
+    }
+    const h = after(delayMs, callback);
+    const myId = this.idGen++;
+    this.timerMap[myId] = h;
+
+    const tm = this.timerMap;
+
+    return {
+      clear() {
+        h.clear();
+        delete tm[myId];
+      },
+    };
+  }
+
+  every(delayMs: number, callback: () => void): TimerHandle {
+    if (this.stopped) {
+      logger.warn("dropping timer since timer group is stopped");
+      return nullTimerHandle;
+    }
+    const h = every(delayMs, callback);
+    const myId = this.idGen++;
+    this.timerMap[myId] = h;
+
+    const tm = this.timerMap;
+
+    return {
+      clear() {
+        h.clear();
+        delete tm[myId];
+      },
+    };
+  }
+}
-- 
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