core: handle target crash at any point

core/gather/driver.js

@@ -8,7 +8,6 @@ import log from 'lighthouse-logger';
 
 import {ExecutionContext} from './driver/execution-context.js';
 import {TargetManager} from './driver/target-manager.js';
-import {LighthouseError} from '../lib/lh-error.js';
 import {Fetcher} from './fetcher.js';
 import {NetworkMonitor} from './driver/network-monitor.js';
 
@@ -29,6 +28,7 @@ const throwingSession = {
   sendCommand: throwNotConnectedFn,
   sendCommandAndIgnore: throwNotConnectedFn,
   dispose: throwNotConnectedFn,
+  onCrashPromise: throwNotConnectedFn,
 };
 
 /** @implements {LH.Gatherer.Driver} */
@@ -48,12 +48,6 @@ class Driver {
     this._fetcher = undefined;
 
     this.defaultSession = throwingSession;
-
-    // Poor man's Promise.withResolvers()
-    /** @param {Error} _ */
-    let rej = _ => {};
-    const promise = /** @type {Promise<never>} */ (new Promise((_, theRej) => rej = theRej));
-    this.fatalRejection = {promise, rej};
   }
 
   /** @return {LH.Gatherer.Driver['executionContext']} */
@@ -93,30 +87,11 @@ class Driver {
     this._networkMonitor = new NetworkMonitor(this._targetManager);
     await this._networkMonitor.enable();
     this.defaultSession = this._targetManager.rootSession();
-    this.listenForCrashes();
     this._executionContext = new ExecutionContext(this.defaultSession);
     this._fetcher = new Fetcher(this.defaultSession);
     log.timeEnd(status);
   }
 
-  /**
-   * If the target crashes, we can't continue gathering.
-   *
-   * FWIW, if the target unexpectedly detaches (eg the user closed the tab), pptr will
-   * catch that and reject into our this._cdpSession.send, which we'll alrady handle appropriately
-   * @return {void}
-   */
-  listenForCrashes() {
-    this.defaultSession.on('Inspector.targetCrashed', async _ => {
-      log.error('Driver', 'Inspector.targetCrashed');
-      // Manually detach so no more CDP traffic is attempted.
-      // Don't await, else our rejection will be a 'Target closed' protocol error on cross-talk CDP calls.
-      void this.defaultSession.dispose();
-      this.fatalRejection.rej(new LighthouseError(LighthouseError.errors.TARGET_CRASHED));
-    });
-  }
-
-
   /** @return {Promise<void>} */
   async disconnect() {
     if (this.defaultSession === throwingSession) return;

core/gather/driver/navigation.js

@@ -123,7 +123,7 @@ async function gotoURL(driver, requestor, options) {
   }
 
   const waitConditions = await Promise.race([
-    driver.fatalRejection.promise,
+    session.onCrashPromise(),
     Promise.all(waitConditionPromises),
   ]);
   const timedOut = waitConditions.some(condition => condition.timedOut);

core/gather/session.js

@@ -44,6 +44,22 @@ class ProtocolSession extends CrdpEventEmitter {
     this._handleProtocolEvent = this._handleProtocolEvent.bind(this);
     // @ts-expect-error Puppeteer expects the handler params to be type `unknown`
     this._cdpSession.on('*', this._handleProtocolEvent);
+
+    // If the target crashes, we can't continue gathering.
+    // FWIW, if the target unexpectedly detaches (eg the user closed the tab), pptr will
+    // catch that and reject in this._cdpSession.send, which is caught by us.
+    /** @param {Error} _ */
+    let rej = _ => {}; // Poor man's Promise.withResolvers()
+    this._targetCrashedPromise = /** @type {Promise<never>} */ (
+      new Promise((_, theRej) => rej = theRej));
+    this.on('Inspector.targetCrashed', async () => {
+      log.error('TargetManager', 'Inspector.targetCrashed');
+      // Manually detach so no more CDP traffic is attempted.
+      // Don't await, else our rejection will be a 'Target closed' protocol error on cross-talk
+      // CDP calls.
+      void this.dispose();
+      rej(new LighthouseError(LighthouseError.errors.TARGET_CRASHED));
+    });
   }
 
   id() {
@@ -114,7 +130,8 @@ class ProtocolSession extends CrdpEventEmitter {
       log.formatProtocol('method <= browser ERR', {method}, 'error');
       throw LighthouseError.fromProtocolMessage(method, error);
     });
-    const resultWithTimeoutPromise = Promise.race([resultPromise, timeoutPromise]);
+    const resultWithTimeoutPromise =
+      Promise.race([resultPromise, timeoutPromise, this._targetCrashedPromise]);
 
     return resultWithTimeoutPromise.finally(() => {
       if (timeout) clearTimeout(timeout);
@@ -142,6 +159,10 @@ class ProtocolSession extends CrdpEventEmitter {
     this._cdpSession.off('*', this._handleProtocolEvent);
     await this._cdpSession.detach().catch(e => log.verbose('session', 'detach failed', e.message));
   }
+
+  onCrashPromise() {
+    return this._targetCrashedPromise;
+  }
 }
 
 export {ProtocolSession};

core/test/gather/mock-driver.js

@@ -38,6 +38,7 @@ function createMockSession() {
     addProtocolMessageListener: createMockOnFn(),
     removeProtocolMessageListener: fnAny(),
     dispose: fnAny(),
+    onCrashPromise: fnAny().mockReturnValue(new Promise(() => {})),
 
     /** @return {LH.Gatherer.ProtocolSession} */
     asSession() {
@@ -158,13 +159,6 @@ function createMockDriver() {
   const context = createMockExecutionContext();
   const targetManager = createMockTargetManager(session);
 
-  // The `fatalRejection`
-  /** @param {Error} _ */
-  let rej = _ => {};
-  const promise = new Promise((_, theRej) => {
-    rej = theRej;
-  });
-
   return {
     _page: page,
     _executionContext: context,
@@ -179,8 +173,6 @@ function createMockDriver() {
       fetchResource: fnAny(),
     },
     networkMonitor: new NetworkMonitor(targetManager.asTargetManager()),
-    listenForCrashes: fnAny(),
-    fatalRejection: {promise, rej},
 
     /** @return {Driver} */
     asDriver() {

types/gatherer.d.ts

@@ -35,6 +35,7 @@ declare module Gatherer {
     sendCommand<TMethod extends keyof CrdpCommands>(method: TMethod, ...params: CrdpCommands[TMethod]['paramsType']): Promise<CrdpCommands[TMethod]['returnType']>;
     sendCommandAndIgnore<TMethod extends keyof CrdpCommands>(method: TMethod, ...params: CrdpCommands[TMethod]['paramsType']): Promise<void>;
     dispose(): Promise<void>;
+    onCrashPromise(): Promise<never>;
   }
 
   interface Driver {
@@ -49,8 +50,6 @@ declare module Gatherer {
       off(event: 'protocolevent', callback: (payload: Protocol.RawEventMessage) => void): void
     };
     networkMonitor: NetworkMonitor;
-    listenForCrashes: (() => void);
-    fatalRejection: {promise: Promise<never>, rej: (reason: Error) => void}
   }
 
   interface Context<TDependencies extends DependencyKey = DefaultDependenciesKey> {