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lib: rewrite AsyncLocalStorage without async_hooks
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Stephen Belanger
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Jul 28, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| 'use strict'; | ||
|
|
||
| const { | ||
| ArrayPrototypeIndexOf, | ||
| ArrayPrototypePush, | ||
| ArrayPrototypeSplice, | ||
| ObjectIs, | ||
| ReflectApply, | ||
| Symbol, | ||
| } = primordials; | ||
|
|
||
| const { | ||
| AsyncResource, | ||
| createHook, | ||
| executionAsyncResource, | ||
| } = require('async_hooks'); | ||
|
|
||
| const storageList = []; | ||
| const storageHook = createHook({ | ||
| init(asyncId, type, triggerAsyncId, resource) { | ||
| const currentResource = executionAsyncResource(); | ||
| // Value of currentResource is always a non null object | ||
| for (let i = 0; i < storageList.length; ++i) { | ||
| storageList[i]._propagate(resource, currentResource, type); | ||
| } | ||
| }, | ||
| }); | ||
|
|
||
| class AsyncLocalStorage { | ||
| constructor() { | ||
| this.kResourceStore = Symbol('kResourceStore'); | ||
| this.enabled = false; | ||
| } | ||
|
|
||
| static bind(fn) { | ||
| return AsyncResource.bind(fn); | ||
| } | ||
|
|
||
| static snapshot() { | ||
| return AsyncLocalStorage.bind((cb, ...args) => cb(...args)); | ||
| } | ||
|
|
||
| disable() { | ||
| if (this.enabled) { | ||
| this.enabled = false; | ||
| // If this.enabled, the instance must be in storageList | ||
| const index = ArrayPrototypeIndexOf(storageList, this); | ||
| ArrayPrototypeSplice(storageList, index, 1); | ||
| if (storageList.length === 0) { | ||
| storageHook.disable(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| _enable() { | ||
| if (!this.enabled) { | ||
| this.enabled = true; | ||
| ArrayPrototypePush(storageList, this); | ||
| storageHook.enable(); | ||
| } | ||
| } | ||
|
|
||
| // Propagate the context from a parent resource to a child one | ||
| _propagate(resource, triggerResource, type) { | ||
| const store = triggerResource[this.kResourceStore]; | ||
| if (this.enabled) { | ||
| resource[this.kResourceStore] = store; | ||
| } | ||
| } | ||
|
|
||
| enterWith(store) { | ||
| this._enable(); | ||
| const resource = executionAsyncResource(); | ||
| resource[this.kResourceStore] = store; | ||
| } | ||
|
|
||
| run(store, callback, ...args) { | ||
| // Avoid creation of an AsyncResource if store is already active | ||
| if (ObjectIs(store, this.getStore())) { | ||
| return ReflectApply(callback, null, args); | ||
| } | ||
|
|
||
| this._enable(); | ||
|
|
||
| const resource = executionAsyncResource(); | ||
| const oldStore = resource[this.kResourceStore]; | ||
|
|
||
| resource[this.kResourceStore] = store; | ||
|
|
||
| try { | ||
| return ReflectApply(callback, null, args); | ||
| } finally { | ||
| resource[this.kResourceStore] = oldStore; | ||
| } | ||
| } | ||
|
|
||
| exit(callback, ...args) { | ||
| if (!this.enabled) { | ||
| return ReflectApply(callback, null, args); | ||
| } | ||
| this.disable(); | ||
| try { | ||
| return ReflectApply(callback, null, args); | ||
| } finally { | ||
| this._enable(); | ||
| } | ||
| } | ||
|
|
||
| getStore() { | ||
| if (this.enabled) { | ||
| const resource = executionAsyncResource(); | ||
| return resource[this.kResourceStore]; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| module.exports = AsyncLocalStorage; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| 'use strict'; | ||
|
|
||
| const { | ||
| FunctionPrototypeBind, | ||
| ReflectApply, | ||
| } = primordials; | ||
|
|
||
| const { validateFunction } = require('internal/validators'); | ||
|
|
||
| const { AsyncContextFrame } = internalBinding('async_context_frame'); | ||
|
|
||
| class AsyncLocalStorage { | ||
| static bind(fn) { | ||
| validateFunction(fn, 'fn'); | ||
| const run = this.snapshot(); | ||
| return function bound(...args) { | ||
| return run.call(this, fn, ...args); | ||
| }; | ||
| } | ||
|
|
||
| static snapshot() { | ||
| const frame = AsyncContextFrame.current(); | ||
| return function runSnapshot(fn, ...args) { | ||
| const bound = FunctionPrototypeBind(fn, this); | ||
| const prior = AsyncContextFrame.exchange(frame); | ||
| try { | ||
| return ReflectApply(bound, undefined, args); | ||
| } finally { | ||
| AsyncContextFrame.exchange(prior); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| disable() { | ||
| AsyncContextFrame.disable(this); | ||
| } | ||
|
|
||
| enterWith(data) { | ||
| const frame = new AsyncContextFrame(this, data); | ||
| AsyncContextFrame.exchange(frame); | ||
| } | ||
|
|
||
| run(data, fn, ...args) { | ||
| const frame = new AsyncContextFrame(this, data); | ||
| const prior = AsyncContextFrame.exchange(frame); | ||
|
|
||
| try { | ||
| return ReflectApply(fn, undefined, args); | ||
| } finally { | ||
| AsyncContextFrame.exchange(prior); | ||
| } | ||
| } | ||
|
|
||
| exit(fn, ...args) { | ||
| return ReflectApply(this.run, this, [undefined, fn, ...args]); | ||
| } | ||
|
|
||
| getStore() { | ||
| return AsyncContextFrame.current()?.get(this); | ||
| } | ||
| } | ||
|
|
||
| module.exports = AsyncLocalStorage; |
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