async_hooks: add trace events to async_hooks

This will allow trace event to record timing information for all
asynchronous operations that are observed by async_hooks.

PR-URL: https://github.com/nodejs/node/pull/15538
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 35 insertions, 0 deletions

diff --git a/test/parallel/test-trace-events-category-used.js b/test/parallel/test-trace-events-category-used.js
new file mode 100644
index 0000000000..39d09ad862
--- /dev/null
+++ b/test/parallel/test-trace-events-category-used.js
@@ -0,0 +1,35 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const cp = require('child_process');
+
+const CODE = `console.log(
+  process.binding("trace_events").categoryGroupEnabled("custom")
+);`;
+
+common.refreshTmpDir();
+process.chdir(common.tmpDir);
+
+const procEnabled = cp.spawn(
+  process.execPath,
+  [ '--trace-events-enabled', '--trace-event-categories', 'custom', '-e', CODE ]
+);
+let procEnabledOutput = '';
+
+procEnabled.stdout.on('data', (data) => procEnabledOutput += data);
+procEnabled.stderr.pipe(process.stderr);
+procEnabled.once('exit', common.mustCall(() => {
+  assert.strictEqual(procEnabledOutput, 'true\n');
+}));
+
+const procDisabled = cp.spawn(
+  process.execPath,
+  [ '--trace-events-enabled', '--trace-event-categories', 'other', '-e', CODE ]
+);
+let procDisabledOutput = '';
+
+procDisabled.stdout.on('data', (data) => procDisabledOutput += data);
+procDisabled.stderr.pipe(process.stderr);
+procDisabled.once('exit', common.mustCall(() => {
+  assert.strictEqual(procDisabledOutput, 'false\n');
+}));