Wrap all heartbeats methods in try/catch

.changeset/large-games-dress.md

@@ -0,0 +1,5 @@
+---
+'@firebase/app': patch
+---
+
+Prevent heartbeats methods from throwing - warn instead.

packages/app/src/heartbeatService.test.ts

@@ -146,6 +146,26 @@ describe('HeartbeatServiceImpl', () => {
       const emptyHeaders = await heartbeatService.getHeartbeatsHeader();
       expect(emptyHeaders).to.equal('');
     });
+    it(`triggerHeartbeat() doesn't throw even if code errors`, async () => {
+      //@ts-expect-error Ensure this doesn't match
+      heartbeatService._heartbeatsCache?.lastSentHeartbeatDate = 50;
+      //@ts-expect-error Ensure you can't .push() to this
+      heartbeatService._heartbeatsCache.heartbeats = 50;
+      const warnStub = stub(console, 'warn');
+      await heartbeatService.triggerHeartbeat();
+      expect(warnStub).to.be.called;
+      expect(warnStub.args[0][1].message).to.include('heartbeats');
+      warnStub.restore();
+    });
+    it(`getHeartbeatsHeader() doesn't throw even if code errors`, async () => {
+      //@ts-expect-error Ensure you can't .push() to this
+      heartbeatService._heartbeatsCache.heartbeats = 50;
+      const warnStub = stub(console, 'warn');
+      await heartbeatService.getHeartbeatsHeader();
+      expect(warnStub).to.be.called;
+      expect(warnStub.args[0][1].message).to.include('heartbeats');
+      warnStub.restore();
+    });
   });
   describe('If IndexedDB has entries', () => {
     let heartbeatService: HeartbeatServiceImpl;

packages/app/src/heartbeatService.ts

@@ -33,6 +33,7 @@ import {
   HeartbeatStorage,
   SingleDateHeartbeat
 } from './types';
+import { logger } from './logger';
 
 const MAX_HEADER_BYTES = 1024;
 // 30 days
@@ -80,43 +81,47 @@ export class HeartbeatServiceImpl implements HeartbeatService {
    * already logged, subsequent calls to this function in the same day will be ignored.
    */
   async triggerHeartbeat(): Promise<void> {
-    const platformLogger = this.container
-      .getProvider('platform-logger')
-      .getImmediate();
+    try {
+      const platformLogger = this.container
+        .getProvider('platform-logger')
+        .getImmediate();
 
-    // This is the "Firebase user agent" string from the platform logger
-    // service, not the browser user agent.
-    const agent = platformLogger.getPlatformInfoString();
-    const date = getUTCDateString();
-    if (this._heartbeatsCache?.heartbeats == null) {
-      this._heartbeatsCache = await this._heartbeatsCachePromise;
-      // If we failed to construct a heartbeats cache, then return immediately.
+      // This is the "Firebase user agent" string from the platform logger
+      // service, not the browser user agent.
+      const agent = platformLogger.getPlatformInfoString();
+      const date = getUTCDateString();
+      console.log('heartbeats', this._heartbeatsCache?.heartbeats);
       if (this._heartbeatsCache?.heartbeats == null) {
+        this._heartbeatsCache = await this._heartbeatsCachePromise;
+        // If we failed to construct a heartbeats cache, then return immediately.
+        if (this._heartbeatsCache?.heartbeats == null) {
+          return;
+        }
+      }
+      // Do not store a heartbeat if one is already stored for this day
+      // or if a header has already been sent today.
+      if (
+        this._heartbeatsCache.lastSentHeartbeatDate === date ||
+        this._heartbeatsCache.heartbeats.some(
+          singleDateHeartbeat => singleDateHeartbeat.date === date
+        )
+      ) {
         return;
+      } else {
+        // There is no entry for this date. Create one.
+        this._heartbeatsCache.heartbeats.push({ date, agent });
       }
+      // Remove entries older than 30 days.
+      this._heartbeatsCache.heartbeats =
+        this._heartbeatsCache.heartbeats.filter(singleDateHeartbeat => {
+          const hbTimestamp = new Date(singleDateHeartbeat.date).valueOf();
+          const now = Date.now();
+          return now - hbTimestamp <= STORED_HEARTBEAT_RETENTION_MAX_MILLIS;
+        });
+      return this._storage.overwrite(this._heartbeatsCache);
+    } catch (e) {
+      logger.warn(e);
     }
-    // Do not store a heartbeat if one is already stored for this day
-    // or if a header has already been sent today.
-    if (
-      this._heartbeatsCache.lastSentHeartbeatDate === date ||
-      this._heartbeatsCache.heartbeats.some(
-        singleDateHeartbeat => singleDateHeartbeat.date === date
-      )
-    ) {
-      return;
-    } else {
-      // There is no entry for this date. Create one.
-      this._heartbeatsCache.heartbeats.push({ date, agent });
-    }
-    // Remove entries older than 30 days.
-    this._heartbeatsCache.heartbeats = this._heartbeatsCache.heartbeats.filter(
-      singleDateHeartbeat => {
-        const hbTimestamp = new Date(singleDateHeartbeat.date).valueOf();
-        const now = Date.now();
-        return now - hbTimestamp <= STORED_HEARTBEAT_RETENTION_MAX_MILLIS;
-      }
-    );
-    return this._storage.overwrite(this._heartbeatsCache);
   }
 
   /**
@@ -127,39 +132,44 @@ export class HeartbeatServiceImpl implements HeartbeatService {
    * returns an empty string.
    */
   async getHeartbeatsHeader(): Promise<string> {
-    if (this._heartbeatsCache === null) {
-      await this._heartbeatsCachePromise;
-    }
-    // If it's still null or the array is empty, there is no data to send.
-    if (
-      this._heartbeatsCache?.heartbeats == null ||
-      this._heartbeatsCache.heartbeats.length === 0
-    ) {
+    try {
+      if (this._heartbeatsCache === null) {
+        await this._heartbeatsCachePromise;
+      }
+      // If it's still null or the array is empty, there is no data to send.
+      if (
+        this._heartbeatsCache?.heartbeats == null ||
+        this._heartbeatsCache.heartbeats.length === 0
+      ) {
+        return '';
+      }
+      const date = getUTCDateString();
+      // Extract as many heartbeats from the cache as will fit under the size limit.
+      const { heartbeatsToSend, unsentEntries } = extractHeartbeatsForHeader(
+        this._heartbeatsCache.heartbeats
+      );
+      const headerString = base64urlEncodeWithoutPadding(
+        JSON.stringify({ version: 2, heartbeats: heartbeatsToSend })
+      );
+      // Store last sent date to prevent another being logged/sent for the same day.
+      this._heartbeatsCache.lastSentHeartbeatDate = date;
+      if (unsentEntries.length > 0) {
+        // Store any unsent entries if they exist.
+        this._heartbeatsCache.heartbeats = unsentEntries;
+        // This seems more likely than emptying the array (below) to lead to some odd state
+        // since the cache isn't empty and this will be called again on the next request,
+        // and is probably safest if we await it.
+        await this._storage.overwrite(this._heartbeatsCache);
+      } else {
+        this._heartbeatsCache.heartbeats = [];
+        // Do not wait for this, to reduce latency.
+        void this._storage.overwrite(this._heartbeatsCache);
+      }
+      return headerString;
+    } catch (e) {
+      logger.warn(e);
       return '';
     }
-    const date = getUTCDateString();
-    // Extract as many heartbeats from the cache as will fit under the size limit.
-    const { heartbeatsToSend, unsentEntries } = extractHeartbeatsForHeader(
-      this._heartbeatsCache.heartbeats
-    );
-    const headerString = base64urlEncodeWithoutPadding(
-      JSON.stringify({ version: 2, heartbeats: heartbeatsToSend })
-    );
-    // Store last sent date to prevent another being logged/sent for the same day.
-    this._heartbeatsCache.lastSentHeartbeatDate = date;
-    if (unsentEntries.length > 0) {
-      // Store any unsent entries if they exist.
-      this._heartbeatsCache.heartbeats = unsentEntries;
-      // This seems more likely than emptying the array (below) to lead to some odd state
-      // since the cache isn't empty and this will be called again on the next request,
-      // and is probably safest if we await it.
-      await this._storage.overwrite(this._heartbeatsCache);
-    } else {
-      this._heartbeatsCache.heartbeats = [];
-      // Do not wait for this, to reduce latency.
-      void this._storage.overwrite(this._heartbeatsCache);
-    }
-    return headerString;
   }
 }