fix(node): Enforce that ContextLines integration does not leave open file handles (#14995)

The ContextLines integration uses readable streams to more memory
efficiently read files that it uses to attach source context to outgoing
events. See more details here:
#12221

Unfortunately, if we don't explicitly destroy the stream after creating
and using it, it won't get closed, even when we remove the readline
interface that uses the stream (which actual does the reading of files).

To fix this, we adjust the resolve logic when getting file context to
destroy the stream, as we anyway are done with the readline interface.

Author: AbhiPrasad

CHANGELOG.md

@@ -10,7 +10,7 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
-Work in this release was contributed by @nwalters512, @aloisklink, @arturovt, @benjick and @maximepvrt. Thank you for your contributions!
+Work in this release was contributed by @nwalters512, @aloisklink, @arturovt, @benjick, @maximepvrt, and @mstrokin. Thank you for your contributions!
 
 - **feat(solidstart)!: Default to `--import` setup and add `autoInjectServerSentry` ([#14862](https://github.com/getsentry/sentry-javascript/pull/14862))**
 

dev-packages/node-integration-tests/suites/contextLines/instrument.mjs renamed to dev-packages/node-integration-tests/suites/contextLines/filename-with-spaces/instrument.mjs

@@ -1,5 +1,5 @@
 import { join } from 'path';
-import { createRunner } from '../../utils/runner';
+import { createRunner } from '../../../utils/runner';
 
 describe('ContextLines integration in ESM', () => {
   test('reads encoded context lines from filenames with spaces', done => {

dev-packages/node-integration-tests/suites/contextLines/scenario with space.cjs renamed to dev-packages/node-integration-tests/suites/contextLines/filename-with-spaces/scenario with space.cjs

@@ -0,0 +1,5 @@
+import * as Sentry from '@sentry/node';
+
+export function captureException(i: number): void {
+  Sentry.captureException(new Error(`error in loop ${i}`));
+}

dev-packages/node-integration-tests/suites/contextLines/scenario with space.mjs renamed to dev-packages/node-integration-tests/suites/contextLines/filename-with-spaces/scenario with space.mjs

@@ -0,0 +1,7 @@
+import { captureException } from './nested-file';
+
+export function runSentry(): void {
+  for (let i = 0; i < 10; i++) {
+    captureException(i);
+  }
+}

dev-packages/node-integration-tests/suites/contextLines/test.ts renamed to dev-packages/node-integration-tests/suites/contextLines/filename-with-spaces/test.ts

@@ -0,0 +1,30 @@
+import { execSync } from 'node:child_process';
+import * as path from 'node:path';
+
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+import * as Sentry from '@sentry/node';
+
+Sentry.init({
+  dsn: 'https://[email protected]/1337',
+  release: '1.0',
+  transport: loggingTransport,
+});
+
+import { runSentry } from './other-file';
+
+runSentry();
+
+const lsofOutput = execSync(`lsof -p ${process.pid}`, { encoding: 'utf8' });
+const lsofTable = lsofOutput.split('\n');
+const mainPath = __dirname.replace(`${path.sep}suites${path.sep}contextLines${path.sep}memory-leak`, '');
+const numberOfLsofEntriesWithMainPath = lsofTable.filter(entry => entry.includes(mainPath));
+
+// There should only be a single entry with the main path, otherwise we are leaking file handles from the
+// context lines integration.
+if (numberOfLsofEntriesWithMainPath.length > 1) {
+  // eslint-disable-next-line no-console
+  console.error('Leaked file handles detected');
+  // eslint-disable-next-line no-console
+  console.error(lsofTable);
+  process.exit(1);
+}

dev-packages/node-integration-tests/suites/contextLines/memory-leak/nested-file.ts

@@ -0,0 +1,16 @@
+import { cleanupChildProcesses, createRunner } from '../../../utils/runner';
+
+describe('ContextLines integration in CJS', () => {
+  afterAll(() => {
+    cleanupChildProcesses();
+  });
+
+  // Regression test for: https://github.com/getsentry/sentry-javascript/issues/14892
+  test('does not leak open file handles', done => {
+    createRunner(__dirname, 'scenario.ts')
+      .expectN(10, {
+        event: {},
+      })
+      .start(done);
+  });
+});