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5c27e44488
Removes the requirement to use `--trace-events-enabled` to enable
trace events. Tracing is enabled automatically if there are any
enabled categories.
Adds a new `trace_events` module with an API for enabling/disabling
trace events at runtime without a command line flag.
```js
const trace_events = require('trace_events');
const categories = [ 'node.perf', 'node.async_hooks' ];
const tracing = trace_events.createTracing({ categories });
tracing.enable();
// do stuff
tracing.disable();
```
Multiple `Tracing` objects may exist and be enabled at any point
in time. The enabled trace event categories is the union of all
enabled `Tracing` objects and the `--trace-event-categories`
flag.
PR-URL: https://github.com/nodejs/node/pull/19803
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
53 lines
1.3 KiB
JavaScript
53 lines
1.3 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const cp = require('child_process');
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const path = require('path');
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const fs = require('fs');
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const tmpdir = require('../common/tmpdir');
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const names = [
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'environment',
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'nodeStart',
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'v8Start',
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'loopStart',
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'loopExit',
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'bootstrapComplete',
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'thirdPartyMainStart',
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'thirdPartyMainEnd',
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'clusterSetupStart',
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'clusterSetupEnd',
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'moduleLoadStart',
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'moduleLoadEnd',
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'preloadModulesLoadStart',
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'preloadModulesLoadEnd'
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];
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if (process.argv[2] === 'child') {
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1 + 1;
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} else {
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tmpdir.refresh();
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process.chdir(tmpdir.path);
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const proc = cp.fork(__filename,
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[ 'child' ], {
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execArgv: [
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'--trace-event-categories',
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'node.bootstrap'
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]
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});
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proc.once('exit', common.mustCall(() => {
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const file = path.join(tmpdir.path, 'node_trace.1.log');
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assert(common.fileExists(file));
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fs.readFile(file, common.mustCall((err, data) => {
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const traces = JSON.parse(data.toString()).traceEvents;
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traces.forEach((trace) => {
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assert.strictEqual(trace.pid, proc.pid);
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assert(names.includes(trace.name));
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});
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}));
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}));
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}
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