forked from cameroncooke/reloaderoo
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathprocess-manager.test.ts
More file actions
445 lines (364 loc) · 13.8 KB
/
Copy pathprocess-manager.test.ts
File metadata and controls
445 lines (364 loc) · 13.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
/**
* Tests for ProcessManager - Child MCP server lifecycle management
*/
import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { ProcessManager } from '../src/process-manager.js';
import { ProcessState, ProxyConfig, ProxyErrorCode } from '../src/types.js';
// Mock cross-spawn module with factory function
vi.mock('cross-spawn', () => ({
spawn: vi.fn()
}));
// Variables for controllable mocking
let mockSpawn: any;
let currentMockProcess: any = null;
// Helper to create a fully synchronous, controllable mock child process
function createMockChildProcess(pid = 12345) {
const callbacks = new Map<string, Function[]>();
const mockProcess = {
pid,
stdout: { on: vi.fn(), pipe: vi.fn(), removeAllListeners: vi.fn() },
stderr: { on: vi.fn(), pipe: vi.fn(), removeAllListeners: vi.fn() },
stdin: { write: vi.fn(), end: vi.fn() },
kill: vi.fn(),
removeAllListeners: vi.fn(),
// Store event callbacks for manual triggering
on: vi.fn((event: string, callback: Function) => {
if (!callbacks.has(event)) {
callbacks.set(event, []);
}
callbacks.get(event)!.push(callback);
}),
// Synchronous event triggering methods
triggerSpawn: () => {
const spawnCallbacks = callbacks.get('spawn') || [];
spawnCallbacks.forEach(cb => cb());
},
triggerError: (error: Error) => {
const errorCallbacks = callbacks.get('error') || [];
errorCallbacks.forEach(cb => cb(error));
},
triggerExit: (code: number, signal?: string) => {
const exitCallbacks = callbacks.get('exit') || [];
exitCallbacks.forEach(cb => cb(code, signal));
}
};
return mockProcess;
}
// Mock logger
vi.mock('../src/logger.js', () => ({
logger: {
info: vi.fn(),
debug: vi.fn(),
warn: vi.fn(),
error: vi.fn(),
fatal: vi.fn()
}
}));
describe('ProcessManager', () => {
let processManager: ProcessManager;
let mockConfig: ProxyConfig;
beforeEach(async () => {
vi.useFakeTimers();
// Import the mocked spawn function
const { spawn } = await import('cross-spawn');
mockSpawn = vi.mocked(spawn);
mockConfig = {
childCommand: 'node test-server.js',
childArgs: ['--test'],
workingDirectory: '/tmp',
environment: { NODE_ENV: 'test' },
restartLimit: 3,
operationTimeout: 5000,
logLevel: 'info',
autoRestart: false, // Disable auto-restart for unit tests
restartDelay: 100
};
processManager = new ProcessManager(mockConfig);
currentMockProcess = null;
// Setup default mock behavior - trigger spawn immediately to avoid timeout
mockSpawn.mockImplementation(() => {
currentMockProcess = createMockChildProcess();
const processToTrigger = currentMockProcess;
// Auto-trigger spawn success synchronously to avoid any timing issues
process.nextTick(() => {
if (processToTrigger) {
processToTrigger.triggerSpawn();
}
});
return currentMockProcess;
});
});
afterEach(() => {
vi.useRealTimers();
vi.clearAllMocks();
currentMockProcess = null;
});
describe('constructor', () => {
it('should initialize with correct default state', () => {
expect(processManager.getState()).toBe(ProcessState.STOPPED);
expect(processManager.getRestartCount()).toBe(0);
expect(processManager.getChildProcess()).toBeNull();
});
it('should validate configuration', () => {
expect(() => {
new ProcessManager({
...mockConfig,
childCommand: ''
});
}).toThrow();
expect(() => {
new ProcessManager({
...mockConfig,
restartLimit: -1
});
}).toThrow();
});
});
describe('getState', () => {
it('should return current process state', () => {
expect(processManager.getState()).toBe(ProcessState.STOPPED);
});
});
describe('getRestartCount', () => {
it('should return current restart count', () => {
expect(processManager.getRestartCount()).toBe(0);
});
});
describe('getChildProcess', () => {
it('should return null when no process is running', () => {
expect(processManager.getChildProcess()).toBeNull();
});
});
describe('isHealthy', () => {
it('should return false when process is not running', async () => {
const healthy = await processManager.isHealthy();
expect(healthy).toBe(false);
});
});
describe('error handling', () => {
it('should emit error events', (done) => {
processManager.on('error', (error) => {
expect(error.code).toBeDefined();
expect(error.message).toBeDefined();
done();
});
// Trigger an error by trying to spawn with invalid state
processManager.spawn().catch(() => {
// Expected to fail in test environment
});
});
});
describe('configuration validation', () => {
it('should reject invalid child command', () => {
expect(() => {
new ProcessManager({
...mockConfig,
childCommand: ''
});
}).toThrow('childCommand is required');
});
it('should reject negative restart limit', () => {
expect(() => {
new ProcessManager({
...mockConfig,
restartLimit: -1
});
}).toThrow('restartLimit must be >= 0');
});
it('should reject too short operation timeout', () => {
expect(() => {
new ProcessManager({
...mockConfig,
operationTimeout: 500
});
}).toThrow('operationTimeout must be >= 1000ms');
});
});
describe('event emission', () => {
it('should be an EventEmitter', () => {
expect(processManager.on).toBeDefined();
expect(processManager.emit).toBeDefined();
expect(processManager.removeListener).toBeDefined();
});
it('should support event listeners', () => {
const listener = vi.fn();
processManager.on('error', listener);
processManager.removeListener('error', listener);
expect(listener).not.toHaveBeenCalled();
});
});
describe('spawn', () => {
it('should successfully spawn child process', async () => {
const startedListener = vi.fn();
processManager.on('started', startedListener);
const spawnPromise = processManager.spawn();
// Trigger spawn success
currentMockProcess.triggerSpawn();
await spawnPromise;
expect(mockSpawn).toHaveBeenCalledWith(
'node',
['test-server.js', '--test'],
expect.objectContaining({
cwd: mockConfig.workingDirectory,
env: expect.objectContaining(mockConfig.environment),
stdio: ['pipe', 'pipe', 'pipe']
})
);
expect(processManager.getState()).toBe(ProcessState.RUNNING);
expect(processManager.getChildProcess()).toBe(currentMockProcess);
expect(startedListener).toHaveBeenCalledWith(12345);
});
it('should handle spawn errors', async () => {
const errorListener = vi.fn();
processManager.on('error', errorListener);
const spawnError = new Error('Spawn failed');
const spawnPromise = processManager.spawn();
// Trigger spawn error
currentMockProcess.triggerError(spawnError);
await expect(spawnPromise).rejects.toThrow();
expect(processManager.getState()).toBe(ProcessState.UNAVAILABLE);
expect(errorListener).toHaveBeenCalled();
});
it('should timeout if spawn takes too long', async () => {
const spawnPromise = processManager.spawn();
// Fast-forward past timeout without triggering spawn
vi.advanceTimersByTime(6000);
await expect(spawnPromise).rejects.toThrow('timed out');
expect(processManager.getState()).toBe(ProcessState.UNAVAILABLE);
});
it('should reject spawn when already running', async () => {
// First spawn
const spawnPromise1 = processManager.spawn();
currentMockProcess.triggerSpawn();
await spawnPromise1;
// Second spawn should fail
await expect(processManager.spawn()).rejects.toThrow('Cannot spawn process in state');
});
});
describe('terminate', () => {
it('should gracefully terminate running process', async () => {
// Start process first
const spawnPromise = processManager.spawn();
currentMockProcess.triggerSpawn();
await spawnPromise;
expect(processManager.getState()).toBe(ProcessState.RUNNING);
// Now terminate with graceful exit
const terminatePromise = processManager.terminate();
// Simulate graceful exit after SIGTERM
currentMockProcess.triggerExit(0, 'SIGTERM');
await terminatePromise;
expect(currentMockProcess.kill).toHaveBeenCalledWith('SIGTERM');
expect(processManager.getState()).toBe(ProcessState.STOPPED);
});
it('should handle terminate when not running', async () => {
await expect(processManager.terminate()).resolves.not.toThrow();
expect(processManager.getState()).toBe(ProcessState.STOPPED);
});
it('should force kill if graceful termination fails', async () => {
// Start process first
const spawnPromise = processManager.spawn();
currentMockProcess.triggerSpawn();
await spawnPromise;
const terminatePromise = processManager.terminate();
// Don't trigger exit to simulate hanging process
// Fast forward past graceful timeout to trigger force kill
vi.advanceTimersByTime(6000);
// Now simulate force kill succeeding
currentMockProcess.triggerExit(0, 'SIGKILL');
await terminatePromise;
expect(currentMockProcess.kill).toHaveBeenCalledWith('SIGTERM');
expect(currentMockProcess.kill).toHaveBeenCalledWith('SIGKILL');
expect(processManager.getState()).toBe(ProcessState.STOPPED);
});
});
describe('restart', () => {
it('should restart running process', async () => {
// Start process first
const spawnPromise1 = processManager.spawn();
const oldProcess = currentMockProcess;
oldProcess.triggerSpawn();
await spawnPromise1;
expect(processManager.getRestartCount()).toBe(0);
expect(processManager.getState()).toBe(ProcessState.RUNNING);
// Track new process for restart
let newProcess: any = null;
mockSpawn.mockImplementation(() => {
newProcess = createMockChildProcess(54321);
currentMockProcess = newProcess;
const processToTrigger = newProcess;
// Auto-trigger spawn for restart
process.nextTick(() => {
if (processToTrigger) {
processToTrigger.triggerSpawn();
}
});
return newProcess;
});
// Start restart - this will terminate old process then spawn new
const restartPromise = processManager.restart();
// Simulate old process exiting gracefully
oldProcess.triggerExit(0, 'SIGTERM');
// Run all timers to handle restart delay
await vi.runAllTimersAsync();
await restartPromise;
// Verify restart completed successfully
// Note: restart count resets to 0 when spawn succeeds (by design)
expect(processManager.getRestartCount()).toBe(0);
expect(processManager.getState()).toBe(ProcessState.RUNNING);
expect(oldProcess.kill).toHaveBeenCalledWith('SIGTERM');
expect(newProcess?.pid).toBe(54321);
});
it('should restart stopped process', async () => {
// Starting from stopped state - should just spawn new process
expect(processManager.getState()).toBe(ProcessState.STOPPED);
// Reset spawn call count and override spawn implementation for this test
mockSpawn.mockClear();
mockSpawn.mockImplementation(() => {
currentMockProcess = createMockChildProcess();
const processToTrigger = currentMockProcess;
// Trigger spawn success asynchronously but immediately
process.nextTick(() => {
if (processToTrigger) {
processToTrigger.triggerSpawn();
}
});
return currentMockProcess;
});
// Start restart from stopped state
const restartPromise = processManager.restart();
// Run all timers to ensure async operations complete
await vi.runAllTimersAsync();
await restartPromise;
// Verify restart spawned new process
expect(processManager.getState()).toBe(ProcessState.RUNNING);
// Note: restart count resets to 0 when spawn succeeds (by design)
expect(processManager.getRestartCount()).toBe(0);
expect(mockSpawn).toHaveBeenCalledTimes(1);
});
it('should respect restart limits', async () => {
// Test restart limit enforcement
const limitedConfig = { ...mockConfig, restartLimit: 0 };
const limitedManager = new ProcessManager(limitedConfig);
// Restart should be rejected immediately due to limit
await expect(limitedManager.restart()).rejects.toThrow('Maximum restart attempts');
expect(limitedManager.getRestartCount()).toBe(0);
});
});
describe('isHealthy', () => {
it('should return false when not running', async () => {
const healthy = await processManager.isHealthy();
expect(healthy).toBe(false);
});
it('should return true for running healthy process', async () => {
// Start process first
const spawnPromise = processManager.spawn();
// Configure kill to return false (process exists and healthy)
currentMockProcess.kill.mockReturnValue(false);
currentMockProcess.triggerSpawn();
await spawnPromise;
// The healthy check should complete quickly since kill(0) returns false (process exists)
const healthy = await processManager.isHealthy();
expect(healthy).toBe(true);
});
});
});