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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>
90 lines
2.1 KiB
JavaScript
90 lines
2.1 KiB
JavaScript
'use strict';
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const { hasTracing } = process.binding('config');
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const kHandle = Symbol('handle');
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const kEnabled = Symbol('enabled');
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const kCategories = Symbol('categories');
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const kMaxTracingCount = 10;
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const {
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ERR_TRACE_EVENTS_CATEGORY_REQUIRED,
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ERR_TRACE_EVENTS_UNAVAILABLE,
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ERR_INVALID_ARG_TYPE
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} = require('internal/errors').codes;
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if (!hasTracing)
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throw new ERR_TRACE_EVENTS_UNAVAILABLE();
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const { CategorySet, getEnabledCategories } = process.binding('trace_events');
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const { customInspectSymbol } = require('internal/util');
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const { format } = require('util');
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const enabledTracingObjects = new Set();
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class Tracing {
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constructor(categories) {
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this[kHandle] = new CategorySet(categories);
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this[kCategories] = categories;
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this[kEnabled] = false;
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}
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enable() {
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if (!this[kEnabled]) {
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this[kEnabled] = true;
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this[kHandle].enable();
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enabledTracingObjects.add(this);
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if (enabledTracingObjects.size > kMaxTracingCount) {
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process.emitWarning(
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'Possible trace_events memory leak detected. There are more than ' +
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`${kMaxTracingCount} enabled Tracing objects.`
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);
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}
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}
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}
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disable() {
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if (this[kEnabled]) {
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this[kEnabled] = false;
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this[kHandle].disable();
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enabledTracingObjects.delete(this);
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}
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}
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get enabled() {
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return this[kEnabled];
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}
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get categories() {
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return this[kCategories].join(',');
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}
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[customInspectSymbol](depth, opts) {
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const obj = {
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enabled: this.enabled,
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categories: this.categories
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};
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return `Tracing ${format(obj)}`;
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}
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}
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function createTracing(options) {
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if (typeof options !== 'object' || options == null)
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throw new ERR_INVALID_ARG_TYPE('options', 'object', options);
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if (!Array.isArray(options.categories)) {
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throw new ERR_INVALID_ARG_TYPE('options.categories', 'string[]',
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options.categories);
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}
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if (options.categories.length <= 0)
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throw new ERR_TRACE_EVENTS_CATEGORY_REQUIRED();
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return new Tracing(options.categories);
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}
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module.exports = {
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createTracing,
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getEnabledCategories
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};
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