184 lines
7.6 KiB
TypeScript
184 lines
7.6 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {getFileSystem} from '../../../src/ngtsc/file_system';
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import {runInEachFileSystem} from '../../../src/ngtsc/file_system/testing';
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import {AsyncLocker} from '../../src/locking/async_locker';
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import {MockLockFile} from '../helpers/mock_lock_file';
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import {MockLogger} from '../helpers/mock_logger';
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runInEachFileSystem(() => {
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describe('AsyncLocker', () => {
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describe('lock()', () => {
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it('should guard the `fn()` with calls to `write()` and `remove()`', async () => {
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const fs = getFileSystem();
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const log: string[] = [];
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const lockFile = new MockLockFile(fs, log);
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const locker = new AsyncLocker(lockFile, new MockLogger(), 100, 10);
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await locker.lock(async () => {
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log.push('fn() - before');
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// This promise forces node to do a tick in this function, ensuring that we are truly
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// testing an async scenario.
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await Promise.resolve();
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log.push('fn() - after');
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});
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expect(log).toEqual(['write()', 'fn() - before', 'fn() - after', 'remove()']);
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});
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it('should guard the `fn()` with calls to `write()` and `remove()`, even if it throws',
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async () => {
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let error: string = '';
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const fs = getFileSystem();
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const log: string[] = [];
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const lockFile = new MockLockFile(fs, log);
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const locker = new AsyncLocker(lockFile, new MockLogger(), 100, 10);
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try {
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await locker.lock(async () => {
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log.push('fn()');
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throw new Error('ERROR');
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});
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} catch (e) {
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error = e.message;
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}
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expect(error).toEqual('ERROR');
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expect(log).toEqual(['write()', 'fn()', 'remove()']);
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});
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it('should retry if another process is locking', async () => {
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const fs = getFileSystem();
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const log: string[] = [];
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const lockFile = new MockLockFile(fs, log);
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const logger = new MockLogger();
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const locker = new AsyncLocker(lockFile, logger, 100, 10);
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let lockFileContents: string|null = '188';
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spyOn(lockFile, 'write').and.callFake(() => {
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log.push('write()');
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if (lockFileContents) {
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throw {code: 'EEXIST'};
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}
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});
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spyOn(lockFile, 'read').and.callFake(() => {
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log.push('read() => ' + lockFileContents);
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if (lockFileContents === null) {
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throw {code: 'ENOENT'};
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}
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return lockFileContents;
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});
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const promise = locker.lock(async () => log.push('fn()'));
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// The lock is now waiting on the lock-file becoming free, so no `fn()` in the log.
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expect(log).toEqual(['write()', 'read() => 188']);
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expect(logger.logs.info).toEqual([[
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'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
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`(If you are sure no ngcc process is running then you should delete the lock-file at ${
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lockFile.path}.)`
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]]);
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lockFileContents = null;
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// The lock-file has been removed, so we can create our own lock-file, call `fn()` and then
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// remove the lock-file.
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await promise;
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expect(log).toEqual(['write()', 'read() => 188', 'write()', 'fn()', 'remove()']);
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});
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it('should extend the retry timeout if the other process locking the file changes', async () => {
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const fs = getFileSystem();
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const log: string[] = [];
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const lockFile = new MockLockFile(fs, log);
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const logger = new MockLogger();
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const locker = new AsyncLocker(lockFile, logger, 200, 5);
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let lockFileContents: string|null = '188';
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spyOn(lockFile, 'write').and.callFake(() => {
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log.push('write()');
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if (lockFileContents) {
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throw {code: 'EEXIST'};
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}
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});
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spyOn(lockFile, 'read').and.callFake(() => {
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log.push('read() => ' + lockFileContents);
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if (lockFileContents === null) {
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throw {code: 'ENOENT'};
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}
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return lockFileContents;
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});
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const promise = locker.lock(async () => log.push('fn()'));
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// The lock is now waiting on the lock-file becoming free, so no `fn()` in the log.
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expect(log).toEqual(['write()', 'read() => 188']);
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expect(logger.logs.info).toEqual([[
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'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
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`(If you are sure no ngcc process is running then you should delete the lock-file at ${
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lockFile.path}.)`
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]]);
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lockFileContents = '444';
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// The lock-file has been taken over by another process - wait for the next attempt
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await new Promise(resolve => setTimeout(resolve, 250));
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expect(log).toEqual(['write()', 'read() => 188', 'write()', 'read() => 444']);
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expect(logger.logs.info).toEqual([
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['Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
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`(If you are sure no ngcc process is running then you should delete the lock-file at ${
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lockFile.path}.)`],
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['Another process, with id 444, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
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`(If you are sure no ngcc process is running then you should delete the lock-file at ${
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lockFile.path}.)`]
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]);
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lockFileContents = null;
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// The lock-file has been removed, so we can create our own lock-file, call `fn()` and
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// then remove the lock-file.
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await promise;
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expect(log).toEqual([
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'write()', 'read() => 188', 'write()', 'read() => 444', 'write()', 'fn()', 'remove()'
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]);
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});
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it('should error if another process does not release the lock-file before this times out',
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async () => {
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const fs = getFileSystem();
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const log: string[] = [];
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const lockFile = new MockLockFile(fs, log);
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const logger = new MockLogger();
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const locker = new AsyncLocker(lockFile, logger, 100, 2);
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let lockFileContents: string|null = '188';
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spyOn(lockFile, 'write').and.callFake(() => {
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log.push('write()');
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if (lockFileContents) {
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throw {code: 'EEXIST'};
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}
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});
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spyOn(lockFile, 'read').and.callFake(() => {
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log.push('read() => ' + lockFileContents);
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if (lockFileContents === null) {
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throw {code: 'ENOENT'};
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}
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return lockFileContents;
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});
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const promise = locker.lock(async () => log.push('fn()'));
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// The lock is now waiting on the lock-file becoming free, so no `fn()` in the log.
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expect(log).toEqual(['write()', 'read() => 188']);
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// Do not remove the lock-file and let the call to `lock()` timeout.
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let error: Error;
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await promise.catch(e => error = e);
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expect(log).toEqual(['write()', 'read() => 188', 'write()', 'read() => 188']);
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expect(error!.message)
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.toEqual(
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`Timed out waiting 0.2s for another ngcc process, with id 188, to complete.\n` +
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`(If you are sure no ngcc process is running then you should delete the lock-file at ${
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lockFile.path}.)`);
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});
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});
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});
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});
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