feat(service): add Service and ServiceManager for component lifecycle management
Adds two new classes: - Service: long-running component with start/stop lifecycle, health checks, builder pattern and subclass support - ServiceManager: orchestrates multiple services with dependency-ordered startup, failure isolation, retry with backoff, and reverse-order shutdown
This commit is contained in:
517
test/test.14.servicemanager.ts
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517
test/test.14.servicemanager.ts
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import { expect, tap } from '@git.zone/tstest/tapbundle';
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import * as taskbuffer from '../ts/index.js';
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import * as smartdelay from '@push.rocks/smartdelay';
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// ── Test 1: Basic service start/stop lifecycle ─────────────
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tap.test('should start and stop a simple service', async () => {
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let started = false;
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let stopped = false;
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const service = new taskbuffer.Service('TestService')
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.withStart(async () => { started = true; })
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.withStop(async () => { stopped = true; });
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expect(service.state).toEqual('stopped');
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await service.start();
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expect(service.state).toEqual('running');
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expect(started).toBeTrue();
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await service.stop();
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expect(service.state).toEqual('stopped');
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expect(stopped).toBeTrue();
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});
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// ── Test 2: Builder pattern chaining ───────────────────────
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tap.test('should support builder pattern chaining', async () => {
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const service = new taskbuffer.Service('ChainedService')
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.critical()
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.dependsOn('Dep1', 'Dep2')
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.withStart(async () => 'result')
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.withStop(async () => {})
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.withRetry({ maxRetries: 5, baseDelayMs: 100 });
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expect(service.criticality).toEqual('critical');
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expect(service.dependencies).toEqual(['Dep1', 'Dep2']);
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expect(service.retryConfig).toBeTruthy();
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expect(service.retryConfig!.maxRetries).toEqual(5);
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});
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// ── Test 3: Subclass pattern ───────────────────────────────
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tap.test('should support subclass pattern', async () => {
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class MyService extends taskbuffer.Service<string> {
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public startCalled = false;
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public stopCalled = false;
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constructor() {
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super('MySubclassService');
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this.optional();
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}
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protected async serviceStart(): Promise<string> {
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this.startCalled = true;
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return 'hello';
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}
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protected async serviceStop(): Promise<void> {
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this.stopCalled = true;
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}
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}
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const service = new MyService();
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const result = await service.start();
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expect(service.startCalled).toBeTrue();
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expect(service.state).toEqual('running');
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await service.stop();
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expect(service.stopCalled).toBeTrue();
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expect(service.state).toEqual('stopped');
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});
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// ── Test 4: Constructor with options object ────────────────
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tap.test('should accept options object in constructor', async () => {
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let started = false;
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const service = new taskbuffer.Service({
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name: 'OptionsService',
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criticality: 'critical',
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dependencies: ['A', 'B'],
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start: async () => { started = true; },
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stop: async () => {},
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retry: { maxRetries: 10 },
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});
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expect(service.name).toEqual('OptionsService');
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expect(service.criticality).toEqual('critical');
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expect(service.dependencies).toEqual(['A', 'B']);
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await service.start();
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expect(started).toBeTrue();
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await service.stop();
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});
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// ── Test 5: ServiceManager dependency ordering ─────────────
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tap.test('should start services in dependency order', async () => {
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const order: string[] = [];
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const manager = new taskbuffer.ServiceManager({ name: 'TestManager' });
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manager.addService(
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new taskbuffer.Service('C')
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.dependsOn('B')
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.withStart(async () => { order.push('C'); })
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.withStop(async () => {}),
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);
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manager.addService(
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new taskbuffer.Service('A')
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.withStart(async () => { order.push('A'); })
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.withStop(async () => {}),
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);
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manager.addService(
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new taskbuffer.Service('B')
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.dependsOn('A')
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.withStart(async () => { order.push('B'); })
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.withStop(async () => {}),
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);
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await manager.start();
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// A must come before B, B must come before C
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expect(order.indexOf('A')).toBeLessThan(order.indexOf('B'));
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expect(order.indexOf('B')).toBeLessThan(order.indexOf('C'));
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await manager.stop();
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});
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// ── Test 6: Critical service failure aborts startup ────────
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tap.test('should abort startup when a critical service fails', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'CriticalTest' });
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let serviceCStopped = false;
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manager.addService(
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new taskbuffer.Service('Working')
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.critical()
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.withStart(async () => {})
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.withStop(async () => {}),
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);
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manager.addService(
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new taskbuffer.Service('Broken')
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.critical()
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.withStart(async () => { throw new Error('boom'); })
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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manager.addService(
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new taskbuffer.Service('AfterBroken')
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.dependsOn('Broken')
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.withStart(async () => { serviceCStopped = true; })
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.withStop(async () => {}),
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);
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let caught = false;
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try {
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await manager.start();
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} catch (err) {
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caught = true;
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expect((err as Error).message).toInclude('Broken');
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}
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expect(caught).toBeTrue();
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// AfterBroken should never have started because Broken (its dep) failed
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expect(serviceCStopped).toBeFalse();
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});
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// ── Test 7: Optional service failure continues startup ─────
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tap.test('should continue startup when an optional service fails', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'OptionalTest' });
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let criticalStarted = false;
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manager.addService(
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new taskbuffer.Service('Critical')
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.critical()
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.withStart(async () => { criticalStarted = true; })
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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manager.addService(
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new taskbuffer.Service('Optional')
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.optional()
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.withStart(async () => { throw new Error('oops'); })
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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// Should NOT throw
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await manager.start();
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expect(criticalStarted).toBeTrue();
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const health = manager.getHealth();
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expect(health.overall).toEqual('degraded');
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const optionalStatus = manager.getServiceStatus('Optional');
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expect(optionalStatus!.state).toEqual('failed');
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await manager.stop();
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});
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// ── Test 8: Retry with backoff for optional services ───────
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tap.test('should retry failed optional services', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'RetryTest' });
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let attempts = 0;
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manager.addService(
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new taskbuffer.Service('Flaky')
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.optional()
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.withStart(async () => {
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attempts++;
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if (attempts < 3) {
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throw new Error(`attempt ${attempts} failed`);
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}
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})
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.withStop(async () => {})
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.withRetry({ maxRetries: 5, baseDelayMs: 50, maxDelayMs: 100, backoffFactor: 1 }),
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);
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await manager.start();
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expect(attempts).toEqual(3);
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const status = manager.getServiceStatus('Flaky');
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expect(status!.state).toEqual('running');
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await manager.stop();
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});
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// ── Test 9: Reverse-order shutdown ─────────────────────────
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tap.test('should stop services in reverse dependency order', async () => {
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const order: string[] = [];
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const manager = new taskbuffer.ServiceManager({ name: 'ShutdownTest' });
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manager.addService(
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new taskbuffer.Service('Base')
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.withStart(async () => {})
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.withStop(async () => { order.push('Base'); }),
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);
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manager.addService(
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new taskbuffer.Service('Middle')
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.dependsOn('Base')
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.withStart(async () => {})
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.withStop(async () => { order.push('Middle'); }),
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);
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manager.addService(
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new taskbuffer.Service('Top')
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.dependsOn('Middle')
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.withStart(async () => {})
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.withStop(async () => { order.push('Top'); }),
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);
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await manager.start();
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await manager.stop();
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// Top should stop before Middle, Middle before Base
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expect(order.indexOf('Top')).toBeLessThan(order.indexOf('Middle'));
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expect(order.indexOf('Middle')).toBeLessThan(order.indexOf('Base'));
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});
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// ── Test 10: Circular dependency detection ─────────────────
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tap.test('should throw on circular dependency', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'CycleTest' });
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manager.addService(
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new taskbuffer.Service('A')
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.dependsOn('B')
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.withStart(async () => {})
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.withStop(async () => {}),
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);
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manager.addService(
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new taskbuffer.Service('B')
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.dependsOn('A')
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.withStart(async () => {})
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.withStop(async () => {}),
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);
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let caught = false;
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try {
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await manager.start();
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} catch (err) {
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caught = true;
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expect((err as Error).message).toInclude('Circular dependency');
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}
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expect(caught).toBeTrue();
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});
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// ── Test 11: restartService cascades to dependents ─────────
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tap.test('should restart service and its dependents', async () => {
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const startOrder: string[] = [];
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const stopOrder: string[] = [];
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const manager = new taskbuffer.ServiceManager({ name: 'RestartTest' });
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manager.addService(
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new taskbuffer.Service('Base')
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.withStart(async () => { startOrder.push('Base'); })
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.withStop(async () => { stopOrder.push('Base'); })
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.withRetry({ maxRetries: 0 }),
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);
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manager.addService(
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new taskbuffer.Service('Dep')
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.dependsOn('Base')
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.withStart(async () => { startOrder.push('Dep'); })
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.withStop(async () => { stopOrder.push('Dep'); })
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.withRetry({ maxRetries: 0 }),
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);
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await manager.start();
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expect(startOrder).toEqual(['Base', 'Dep']);
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// Clear tracking
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startOrder.length = 0;
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stopOrder.length = 0;
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await manager.restartService('Base');
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// Dep should be stopped first, then Base, then Base restarted, then Dep
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expect(stopOrder).toEqual(['Dep', 'Base']);
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expect(startOrder).toEqual(['Base', 'Dep']);
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await manager.stop();
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});
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// ── Test 12: getHealth returns correct aggregated status ───
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tap.test('should return correct health aggregation', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'HealthTest' });
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manager.addService(
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new taskbuffer.Service('OK')
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.critical()
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.withStart(async () => {})
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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manager.addService(
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new taskbuffer.Service('AlsoOK')
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.optional()
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.withStart(async () => {})
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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await manager.start();
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const health = manager.getHealth();
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expect(health.overall).toEqual('healthy');
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expect(health.services.length).toEqual(2);
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expect(health.startedAt).toBeTruthy();
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expect(health.uptime).toBeGreaterThanOrEqual(0);
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await manager.stop();
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});
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// ── Test 13: Events emitted on state transitions ───────────
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tap.test('should emit events on state transitions', async () => {
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const events: taskbuffer.IServiceEvent[] = [];
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const manager = new taskbuffer.ServiceManager({ name: 'EventTest' });
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manager.addService(
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new taskbuffer.Service('Svc')
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.withStart(async () => {})
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.withStop(async () => {})
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.withRetry({ maxRetries: 0 }),
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);
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manager.serviceSubject.subscribe((event) => {
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events.push(event);
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});
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await manager.start();
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await manager.stop();
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const types = events.map((e) => e.type);
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expect(types).toContain('started');
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expect(types).toContain('stopped');
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});
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// ── Test 14: Parallel startup of independent services ──────
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tap.test('should start independent services in parallel', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'ParallelTest' });
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const startTimes: Record<string, number> = {};
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manager.addService(
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new taskbuffer.Service('A')
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.withStart(async () => {
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startTimes['A'] = Date.now();
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await smartdelay.delayFor(100);
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})
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.withStop(async () => {}),
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);
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manager.addService(
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new taskbuffer.Service('B')
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.withStart(async () => {
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startTimes['B'] = Date.now();
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await smartdelay.delayFor(100);
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})
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.withStop(async () => {}),
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);
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await manager.start();
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// Both should start at roughly the same time (within 50ms)
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const diff = Math.abs(startTimes['A'] - startTimes['B']);
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expect(diff).toBeLessThan(50);
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await manager.stop();
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});
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// ── Test 15: getStatus snapshot ────────────────────────────
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tap.test('should return accurate status snapshot', async () => {
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const service = new taskbuffer.Service('StatusTest')
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.critical()
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.dependsOn('X')
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.withStart(async () => {})
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.withStop(async () => {});
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const statusBefore = service.getStatus();
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expect(statusBefore.state).toEqual('stopped');
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expect(statusBefore.name).toEqual('StatusTest');
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expect(statusBefore.criticality).toEqual('critical');
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expect(statusBefore.dependencies).toEqual(['X']);
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expect(statusBefore.errorCount).toEqual(0);
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await service.start();
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const statusAfter = service.getStatus();
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expect(statusAfter.state).toEqual('running');
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expect(statusAfter.startedAt).toBeTruthy();
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expect(statusAfter.uptime).toBeGreaterThanOrEqual(0);
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await service.stop();
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});
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// ── Test 16: Missing dependency detection ──────────────────
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tap.test('should throw when a dependency is not registered', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'MissingDepTest' });
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manager.addService(
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new taskbuffer.Service('Lonely')
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.dependsOn('Ghost')
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.withStart(async () => {})
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.withStop(async () => {}),
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);
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let caught = false;
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try {
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await manager.start();
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} catch (err) {
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caught = true;
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expect((err as Error).message).toInclude('Ghost');
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expect((err as Error).message).toInclude('not registered');
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}
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expect(caught).toBeTrue();
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});
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// ── Test 17: No-op on double start/stop ────────────────────
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tap.test('should be a no-op when starting an already-running service', async () => {
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let startCount = 0;
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const service = new taskbuffer.Service('DoubleStart')
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.withStart(async () => { startCount++; })
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.withStop(async () => {});
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await service.start();
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await service.start(); // should be no-op
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expect(startCount).toEqual(1);
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await service.stop();
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await service.stop(); // should be no-op
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});
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// ── Test 18: addServiceFromOptions convenience ─────────────
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tap.test('should support addServiceFromOptions', async () => {
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const manager = new taskbuffer.ServiceManager({ name: 'ConvenienceTest' });
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let started = false;
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const service = manager.addServiceFromOptions({
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name: 'Easy',
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start: async () => { started = true; },
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stop: async () => {},
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});
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expect(service).toBeInstanceOf(taskbuffer.Service);
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expect(service.name).toEqual('Easy');
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await manager.start();
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expect(started).toBeTrue();
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await manager.stop();
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});
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export default tap.start();
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Reference in New Issue
Block a user