Periodically optimize FTS table

ts/services/ftsOptimizer.ts

@@ -0,0 +1,63 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { debounce } from 'lodash';
+
+import { SECOND } from '../util/durations';
+import { sleep } from '../util/sleep';
+import { drop } from '../util/drop';
+import dataInterface from '../sql/Client';
+import type { FTSOptimizationStateType } from '../sql/Interface';
+import * as log from '../logging/log';
+
+const INTERACTIVITY_DELAY_MS = 50;
+
+class FTSOptimizer {
+  private isRunning = false;
+
+  public async run(): Promise<void> {
+    if (this.isRunning) {
+      return;
+    }
+    this.isRunning = true;
+
+    log.info('ftsOptimizer: starting');
+
+    let state: FTSOptimizationStateType | undefined;
+
+    const start = Date.now();
+
+    try {
+      do {
+        if (state !== undefined) {
+          // eslint-disable-next-line no-await-in-loop
+          await sleep(INTERACTIVITY_DELAY_MS);
+        }
+
+        // eslint-disable-next-line no-await-in-loop
+        state = await dataInterface.optimizeFTS(state);
+      } while (!state?.done);
+    } finally {
+      this.isRunning = false;
+    }
+
+    const duration = Date.now() - start;
+
+    if (!state) {
+      log.warn('ftsOptimizer: no final state');
+      return;
+    }
+
+    log.info(`ftsOptimizer: took ${duration}ms and ${state.steps} steps`);
+  }
+}
+
+const optimizer = new FTSOptimizer();
+
+export const optimizeFTS = (): void => {
+  drop(optimizer.run());
+};
+
+export const scheduleOptimizeFTS = debounce(optimizeFTS, SECOND, {
+  maxWait: 5 * SECOND,
+});