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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>
62 lines
2.0 KiB
JavaScript
62 lines
2.0 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 fs = require('fs');
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const CODE = `
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process.binding("trace_events").emit(
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'b'.charCodeAt(0), 'custom',
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'type-value', 10, 'extra-value', 20);
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process.binding("trace_events").emit(
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'b'.charCodeAt(0), 'custom',
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'type-value', 20, 'first-value', 20, 'second-value', 30);
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process.binding("trace_events").emit(
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'b'.charCodeAt(0), 'custom',
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'type-value', 30);
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process.binding("trace_events").emit(
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'b'.charCodeAt(0), 'missing',
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'type-value', 10, 'extra-value', 20);
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`;
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const FILE_NAME = 'node_trace.1.log';
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const tmpdir = require('../common/tmpdir');
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tmpdir.refresh();
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process.chdir(tmpdir.path);
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const proc = cp.spawn(process.execPath,
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[ '--trace-event-categories', 'custom',
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'-e', CODE ]);
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proc.once('exit', common.mustCall(() => {
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assert(common.fileExists(FILE_NAME));
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fs.readFile(FILE_NAME, common.mustCall((err, data) => {
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const traces = JSON.parse(data.toString()).traceEvents;
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assert.strictEqual(traces.length, 3);
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assert.strictEqual(traces[0].pid, proc.pid);
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assert.strictEqual(traces[0].ph, 'b');
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assert.strictEqual(traces[0].cat, 'custom');
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assert.strictEqual(traces[0].name, 'type-value');
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assert.strictEqual(traces[0].id, '0xa');
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assert.deepStrictEqual(traces[0].args, { 'extra-value': 20 });
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assert.strictEqual(traces[1].pid, proc.pid);
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assert.strictEqual(traces[1].ph, 'b');
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assert.strictEqual(traces[1].cat, 'custom');
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assert.strictEqual(traces[1].name, 'type-value');
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assert.strictEqual(traces[1].id, '0x14');
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assert.deepStrictEqual(traces[1].args, {
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'first-value': 20,
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'second-value': 30
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});
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assert.strictEqual(traces[2].pid, proc.pid);
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assert.strictEqual(traces[2].ph, 'b');
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assert.strictEqual(traces[2].cat, 'custom');
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assert.strictEqual(traces[2].name, 'type-value');
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assert.strictEqual(traces[2].id, '0x1e');
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assert.deepStrictEqual(traces[2].args, { });
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}));
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}));
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