Rename files

ts/util/incrementMessageCounter.preload.ts

@@ -0,0 +1,77 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import lodash from 'lodash';
+
+import { strictAssert } from './assert.std.js';
+import { safeParseInteger } from './numbers.std.js';
+import { DataReader } from '../sql/Client.preload.js';
+import { createLogger } from '../logging/log.std.js';
+
+const { debounce, isNumber } = lodash;
+
+const log = createLogger('incrementMessageCounter');
+
+let receivedAtCounter: number | undefined;
+
+export async function initializeMessageCounter(): Promise<void> {
+  strictAssert(
+    receivedAtCounter === undefined,
+    'incrementMessageCounter: already initialized'
+  );
+
+  const storedCounter = safeParseInteger(
+    localStorage.getItem('lastReceivedAtCounter') ?? ''
+  );
+  const dbCounter = await DataReader.getMaxMessageCounter();
+
+  if (isNumber(dbCounter) && isNumber(storedCounter)) {
+    log.info('initializeMessageCounter: picking max of db/stored counters');
+    receivedAtCounter = Math.max(dbCounter, storedCounter);
+
+    if (receivedAtCounter !== storedCounter) {
+      log.warn('initializeMessageCounter: mismatch between db/stored counters');
+    }
+  } else if (isNumber(storedCounter)) {
+    log.info('initializeMessageCounter: picking stored counter');
+    receivedAtCounter = storedCounter;
+  } else if (isNumber(dbCounter)) {
+    log.info(
+      'initializeMessageCounter: picking fallback counter from the database'
+    );
+    receivedAtCounter = dbCounter;
+  } else {
+    log.info('initializeMessageCounter: defaulting to Date.now()');
+    receivedAtCounter = Date.now();
+  }
+
+  if (storedCounter !== receivedAtCounter) {
+    localStorage.setItem('lastReceivedAtCounter', String(receivedAtCounter));
+  }
+}
+
+export function incrementMessageCounter(): number {
+  strictAssert(
+    receivedAtCounter !== undefined,
+    'incrementMessageCounter: not initialized'
+  );
+
+  receivedAtCounter += 1;
+  debouncedUpdateLastReceivedAt();
+
+  return receivedAtCounter;
+}
+
+export function flushMessageCounter(): void {
+  debouncedUpdateLastReceivedAt.flush();
+}
+
+const debouncedUpdateLastReceivedAt = debounce(
+  () => {
+    localStorage.setItem('lastReceivedAtCounter', String(receivedAtCounter));
+  },
+  25,
+  {
+    maxWait: 25,
+  }
+);