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const {
ArrayIsArray,
ArrayPrototypeJoin,
SafeSet,
Symbol,
} = primordials;
const { hasTracing } = internalBinding('config');
const kHandle = Symbol('handle');
const kEnabled = Symbol('enabled');
const kCategories = Symbol('categories');
const kMaxTracingCount = 10;
const {
ERR_TRACE_EVENTS_CATEGORY_REQUIRED,
ERR_TRACE_EVENTS_UNAVAILABLE,
ERR_INVALID_ARG_TYPE
} = require('internal/errors').codes;
const { ownsProcessState } = require('internal/worker');
if (!hasTracing || !ownsProcessState)
throw new ERR_TRACE_EVENTS_UNAVAILABLE();
const { CategorySet, getEnabledCategories } = internalBinding('trace_events');
const { customInspectSymbol } = require('internal/util');
const { format } = require('internal/util/inspect');
const {
validateObject,
} = require('internal/validators');
const enabledTracingObjects = new SafeSet();
class Tracing {
constructor(categories) {
this[kHandle] = new CategorySet(categories);
this[kCategories] = categories;
this[kEnabled] = false;
}
enable() {
if (!this[kEnabled]) {
this[kEnabled] = true;
this[kHandle].enable();
enabledTracingObjects.add(this);
if (enabledTracingObjects.size > kMaxTracingCount) {
process.emitWarning(
'Possible trace_events memory leak detected. There are more than ' +
`${kMaxTracingCount} enabled Tracing objects.`
);
}
}
}
disable() {
if (this[kEnabled]) {
this[kEnabled] = false;
this[kHandle].disable();
enabledTracingObjects.delete(this);
}
}
get enabled() {
return this[kEnabled];
}
get categories() {
return ArrayPrototypeJoin(this[kCategories], ',');
}
[customInspectSymbol](depth, opts) {
if (typeof depth === 'number' && depth < 0)
return this;
const obj = {
enabled: this.enabled,
categories: this.categories
};
return `Tracing ${format(obj)}`;
}
}
function createTracing(options) {
validateObject(options, 'options');
if (!ArrayIsArray(options.categories)) {
throw new ERR_INVALID_ARG_TYPE('options.categories', 'string[]',
options.categories);
}
if (options.categories.length <= 0)
throw new ERR_TRACE_EVENTS_CATEGORY_REQUIRED();
return new Tracing(options.categories);
}
module.exports = {
createTracing,
getEnabledCategories
};
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