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'use strict';
// This tests that tracing can be enabled dynamically with the
// trace_events module.
const common = require('../common');
try {
require('trace_events');
} catch {
common.skip('missing trace events');
}
const assert = require('assert');
const cp = require('child_process');
const fs = require('fs');
const path = require('path');
const enable = `require("trace_events").createTracing(
{ categories: ["node.async_hooks"] }).enable();`;
const code =
'setTimeout(() => { for (let i = 0; i < 100000; i++) { "test" + i } }, 1)';
const tmpdir = require('../common/tmpdir');
const filename = path.join(tmpdir.path, 'node_trace.1.log');
tmpdir.refresh();
const proc = cp.spawnSync(
process.execPath,
['-e', enable + code ],
{
cwd: tmpdir.path,
env: { ...process.env,
'NODE_DEBUG_NATIVE': 'tracing',
'NODE_DEBUG': 'tracing'
}
});
console.log('process exit with signal:', proc.signal);
console.log('process stderr:', proc.stderr.toString());
assert.strictEqual(proc.status, 0);
assert(fs.existsSync(filename));
const data = fs.readFileSync(filename, 'utf-8');
const traces = JSON.parse(data).traceEvents;
function filterTimeoutTraces(trace) {
if (trace.pid !== proc.pid)
return false;
if (trace.cat !== 'node,node.async_hooks')
return false;
if (trace.name !== 'Timeout')
return false;
return true;
}
{
const timeoutTraces = traces.filter(filterTimeoutTraces);
assert.notDeepStrictEqual(timeoutTraces, []);
const threads = new Set();
for (const trace of timeoutTraces) {
threads.add(trace.tid);
}
assert.notDeepStrictEqual(timeoutTraces, []);
}
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