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async_hooks: AsyncLocalStorage losing context

nodejs/node#41285·122028·JavaScript·87 天未动·19 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

### Version node v17.3.0 / 16.13.0 ### Platform linux (likely all) ### Subsystem async_hooks ### What steps will reproduce the bug? Run ```js 'use strict' const { AsyncLocalStorage } = require('async_hooks') const { createServer } = require('http') const storage = new AsyncLocalStorage() let counter = 0 createServer((req, res) => { const id = counter++; console.log('In Middleware with id ' + id); storage.run({ id }, function () { req.resume() req.on('end', onEnd(res)) }); }).listen(3000) function onEnd (res) { return () => { const store = storage.getStore() console.log('store is', store) res.end(JSON.stringify(store)) } } ``` Then: ```sh curl -d '{}' -H 'Content-Type: application/json' localhost:3000 ``` You'd note that the store is empty. ### How often does it reproduce? Is there a required condition? All of them. Unfortunately the documentation is quite misleading and it assumes the above would work / we do not document the edge cases. The problem originates on the fact that receiving an HTTP body is part of the http request `AsyncRecource`. Calling `.resume()` on it does not imply we are attaching the new storage to that `AsyncResource`. However our documentation states: > Runs a function synchronously within a context and returns its return value. The store is not accessible outside of the callback function. The store is accessible to any asynchronous operations created within the callback. Unless somebody knows that calling `resume()` is not creating a new asynchronous operation, they will be expecting the context to be preserved. As a further confirmation, the following code works: ```js 'use strict' const { AsyncLocalStorage } = require('async_hooks') const { createServer } = require('http') const storage = new AsyncLocalStorage() let counter = 0 createServer((req, res) => { const id = counter++; console.log('In Middleware with id ' + id); storage.enterWith({ id }) req.resume() req.on('end', onEnd(res)) }).listen(3000…
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