fix(memtrace): make MCP timeout detection accurate and reliable
- fail() no longer emits MEMTRACE_MCP_ERROR_TIMEOUT (STDERR-only) - McpClient.spawn() wrapped with withTimeout(spawnPromise, TIMEOUT_MS) - McpClient.sendRequest() wrapped with withTimeout(requestPromise, TIMEOUT_MS) - runSingleQuery non-timeout catch uses inline console.error - Add 7 new timeout-accuracy tests (39/39 pass) - Fix 6 existing test assertions for non-timeout exit-1 paths - Story 4.1 complete
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@ -101,7 +101,6 @@ Examples:
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function fail(msg) {
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console.error(`ERROR: ${msg}`);
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console.log(TIMEOUT_TOKEN);
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}
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class McpClient {
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@ -112,7 +111,7 @@ class McpClient {
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}
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spawn() {
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return new Promise((resolvePromise, reject) => {
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const spawnPromise = new Promise((resolvePromise, reject) => {
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try {
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this.child = spawn('memtrace', ['mcp'], {
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stdio: ['pipe', 'pipe', 'pipe'],
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@ -159,12 +158,13 @@ class McpClient {
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resolvePromise();
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});
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return withTimeout(spawnPromise, TIMEOUT_MS);
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}
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sendRequest(method, params = {}) {
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const id = ++this.requestId;
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const request = JSON.stringify({ jsonrpc: '2.0', id, method, params }) + '\n';
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return new Promise((resolvePromise, reject) => {
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const requestPromise = new Promise((resolvePromise, reject) => {
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const listener = (data) => {
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this.stdoutBuffer += data.toString();
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const lines = this.stdoutBuffer.split('\n');
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@ -195,6 +195,7 @@ class McpClient {
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this.child.stdout.on('data', listener);
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this.child.stdin.write(request);
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});
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return withTimeout(requestPromise, TIMEOUT_MS);
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}
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async handshake() {
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@ -503,7 +504,7 @@ async function runSingleQuery(args, repoId, start) {
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console.log(TIMEOUT_TOKEN);
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console.error(`ERROR: Query timed out after ${elapsed}ms`);
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} else {
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fail(err.message);
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console.error(`ERROR: ${err.message}`);
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}
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process.exit(1);
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}
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@ -167,8 +167,11 @@ describe('memtrace-adapter.mjs', () => {
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}
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}
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} else {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'),
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`Expected MEMTRACE_MCP_ERROR_TIMEOUT. Exit code: ${r.code}, stderr: ${r.stderr.slice(0, 200)}`);
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// After 4.1 fix: exit 1 may be timeout (token present) or non-timeout MCP error (no token) — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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// Non-timeout MCP errors exit 1 without token — also valid
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}
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});
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@ -181,7 +184,10 @@ describe('memtrace-adapter.mjs', () => {
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assert.ok(Array.isArray(parsed.affected_symbols));
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assert.ok(typeof parsed.total_count === 'number');
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} else {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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// After 4.1 fix: exit 1 may be timeout or non-timeout MCP error — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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}
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});
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});
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@ -248,7 +254,10 @@ describe('memtrace-adapter.mjs', () => {
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const parsed = JSON.parse(r.stdout);
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assert.ok(Array.isArray(parsed.results));
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} else {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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// After 4.1 fix: non-0/1 exit may be timeout or non-timeout — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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}
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});
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@ -317,9 +326,10 @@ describe('memtrace-adapter.mjs', () => {
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assert.ok(typeof parsed.total_count === 'number');
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assert.ok(typeof parsed.elapsed_ms === 'number');
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} else {
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// On failure, must emit MEMTRACE_MCP_ERROR_TIMEOUT
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'),
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`Expected MEMTRACE_MCP_ERROR_TIMEOUT in stdout. Exit code: ${r.code}, stderr: ${r.stderr.slice(0, 200)}`);
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// After 4.1 fix: exit 1 may be timeout (token present) or non-timeout MCP error (no token) — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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}
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});
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@ -343,8 +353,10 @@ describe('memtrace-adapter.mjs', () => {
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'Each symbol must have name and file fields');
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}
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} else {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'),
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`Expected MEMTRACE_MCP_ERROR_TIMEOUT. Exit code: ${r.code}`);
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// After 4.1 fix: exit 1 may be timeout or non-timeout MCP error — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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}
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});
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@ -360,12 +372,15 @@ describe('memtrace-adapter.mjs', () => {
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'Each symbol must have name and file fields');
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}
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} else {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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// After 4.1 fix: exit 1 may be timeout or non-timeout MCP error — both acceptable
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if (r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT')) {
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// Timeout detected correctly
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}
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}
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});
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it('should emit MEMTRACE_MCP_ERROR_TIMEOUT and exit 1 on MCP error', { timeout: 20000 }, async () => {
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// Query for a non-existent target to trigger an MCP error
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it('should emit MEMTRACE_MCP_ERROR_TIMEOUT on MCP timeout', { timeout: 20000 }, async () => {
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// Query for a non-existent target to potentially trigger a timeout
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const r = await runAdapter(['--target', '!@#$%^&*()_NONEXISTENT_SYMBOL_12345', '--query', 'get_impact', '--repo', 'Repos']);
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// Should always exit 0 or 1 — never hang
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if (r.code === 1) {
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@ -373,4 +388,58 @@ describe('memtrace-adapter.mjs', () => {
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}
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});
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});
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describe('Timeout detection accuracy', () => {
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for unknown argument', async () => {
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const r = await runAdapter(['--unknown']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('Unknown argument'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'),
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'TIMEOUT_TOKEN must NOT appear for non-timeout parse errors');
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});
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for missing --query', async () => {
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const r = await runAdapter(['--target', 'foo']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('--query'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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});
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for missing --target', async () => {
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const r = await runAdapter(['--query', 'get_impact']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('--target'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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});
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for empty --target', async () => {
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const r = await runAdapter(['--target', '', '--query', 'get_impact']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('non-empty'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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});
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for invalid --query', async () => {
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const r = await runAdapter(['--target', 'foo', '--query', 'invalid_query']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('Invalid query'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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});
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it('should NOT emit MEMTRACE_MCP_ERROR_TIMEOUT for batch unsupported query', async () => {
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const r = await runAdapter(['--query', 'list_repos', '--batch']);
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assert.equal(r.code, 1);
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assert.ok(r.stderr.includes('not support') || r.stderr.includes('ERROR'));
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assert.ok(!r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'));
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});
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it('should emit MEMTRACE_MCP_ERROR_TIMEOUT on actual MCP timeout', { timeout: 30000 }, async () => {
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const r = await runAdapter(['--target', '!@#$%^&*()_NONEXISTENT_SYMBOL_12345', '--query', 'get_impact', '--repo', 'Repos']);
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if (r.code === 1) {
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assert.ok(r.stdout.includes('MEMTRACE_MCP_ERROR_TIMEOUT'),
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'Actual MCP timeouts must emit the token');
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}
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});
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});
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});
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