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async_hooks: add trace events to async_hooks
This will allow trace event to record timing information for all asynchronous operations that are observed by async_hooks. Backport-PR-URL: #18179 PR-URL: #15538 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,67 @@ | ||
'use strict'; | ||
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const trace_events = process.binding('trace_events'); | ||
const async_wrap = process.binding('async_wrap'); | ||
const async_hooks = require('async_hooks'); | ||
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// Use small letters such that chrome://traceing groups by the name. | ||
// The behaviour is not only useful but the same as the events emitted using | ||
// the specific C++ macros. | ||
const BEFORE_EVENT = 'b'.charCodeAt(0); | ||
const END_EVENT = 'e'.charCodeAt(0); | ||
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// In trace_events it is not only the id but also the name that needs to be | ||
// repeated. Since async_hooks doesn't expose the provider type in the | ||
// non-init events, use a map to manually map the asyncId to the type name. | ||
const typeMemory = new Map(); | ||
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// It is faster to emit trace_events directly from C++. Thus, this happens in | ||
// async_wrap.cc. However, events emitted from the JavaScript API or the | ||
// Embedder C++ API can't be emitted from async_wrap.cc. Thus they are | ||
// emitted using the JavaScript API. To prevent emitting the same event | ||
// twice the async_wrap.Providers list is used to filter the events. | ||
const nativeProviders = new Set(Object.keys(async_wrap.Providers)); | ||
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const hook = async_hooks.createHook({ | ||
init(asyncId, type, triggerAsyncId, resource) { | ||
if (nativeProviders.has(type)) return; | ||
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typeMemory.set(asyncId, type); | ||
trace_events.emit(BEFORE_EVENT, 'node.async_hooks', | ||
type, asyncId, 'triggerAsyncId', triggerAsyncId); | ||
}, | ||
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before(asyncId) { | ||
const type = typeMemory.get(asyncId); | ||
if (type === undefined) return; | ||
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trace_events.emit(BEFORE_EVENT, 'node.async_hooks', | ||
type + '_CALLBACK', asyncId); | ||
}, | ||
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after(asyncId) { | ||
const type = typeMemory.get(asyncId); | ||
if (type === undefined) return; | ||
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trace_events.emit(END_EVENT, 'node.async_hooks', | ||
type + '_CALLBACK', asyncId); | ||
}, | ||
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destroy(asyncId) { | ||
const type = typeMemory.get(asyncId); | ||
if (type === undefined) return; | ||
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trace_events.emit(END_EVENT, 'node.async_hooks', | ||
type, asyncId); | ||
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// cleanup asyncId to type map | ||
typeMemory.delete(asyncId); | ||
} | ||
}); | ||
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exports.setup = function() { | ||
if (trace_events.categoryGroupEnabled('node.async_hooks')) { | ||
hook.enable(); | ||
} | ||
}; |
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