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const assert = require('node:assert')
const { AsyncResource } = require('node:async_hooks')
const { Readable } = require('./readable')
const { InvalidArgumentError, RequestAbortedError } = require('../core/errors')
const util = require('../core/util')
function noop () {}
class RequestHandler extends AsyncResource {
constructor (opts, callback) {
if (!opts || typeof opts !== 'object') {
throw new InvalidArgumentError('invalid opts')
}
const { signal, method, opaque, body, onInfo, responseHeaders, highWaterMark } = opts
try {
if (typeof callback !== 'function') {
throw new InvalidArgumentError('invalid callback')
}
if (highWaterMark != null && (!Number.isFinite(highWaterMark) || highWaterMark < 0)) {
throw new InvalidArgumentError('invalid highWaterMark')
}
if (signal && typeof signal.on !== 'function' && typeof signal.addEventListener !== 'function') {
throw new InvalidArgumentError('signal must be an EventEmitter or EventTarget')
}
if (method === 'CONNECT') {
throw new InvalidArgumentError('invalid method')
}
if (onInfo && typeof onInfo !== 'function') {
throw new InvalidArgumentError('invalid onInfo callback')
}
super('UNDICI_REQUEST')
} catch (err) {
if (util.isStream(body)) {
util.destroy(body.on('error', noop), err)
}
throw err
}
this.method = method
this.responseHeaders = responseHeaders || null
this.opaque = opaque || null
this.callback = callback
this.res = null
this.abort = null
this.body = body
this.trailers = {}
this.context = null
this.onInfo = onInfo || null
this.highWaterMark = highWaterMark
this.reason = null
this.removeAbortListener = null
if (signal?.aborted) {
this.reason = signal.reason ?? new RequestAbortedError()
} else if (signal) {
this.removeAbortListener = util.addAbortListener(signal, () => {
this.reason = signal.reason ?? new RequestAbortedError()
if (this.res) {
util.destroy(this.res.on('error', noop), this.reason)
} else if (this.abort) {
this.abort(this.reason)
}
})
}
}
onConnect (abort, context) {
if (this.reason) {
abort(this.reason)
return
}
assert(this.callback)
this.abort = abort
this.context = context
}
onHeaders (statusCode, rawHeaders, resume, statusMessage) {
const { callback, opaque, abort, context, responseHeaders, highWaterMark } = this
const headers = responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
if (statusCode < 200) {
if (this.onInfo) {
this.onInfo({ statusCode, headers })
}
return
}
const parsedHeaders = responseHeaders === 'raw' ? util.parseHeaders(rawHeaders) : headers
const contentType = parsedHeaders['content-type']
const contentLength = parsedHeaders['content-length']
const res = new Readable({
resume,
abort,
contentType,
contentLength: this.method !== 'HEAD' && contentLength
? Number(contentLength)
: null,
highWaterMark
})
if (this.removeAbortListener) {
res.on('close', this.removeAbortListener)
this.removeAbortListener = null
}
this.callback = null
this.res = res
if (callback !== null) {
try {
this.runInAsyncScope(callback, null, null, {
statusCode,
statusText: statusMessage,
headers,
trailers: this.trailers,
opaque,
body: res,
context
})
} catch (err) {
// If the callback throws synchronously, we need to handle it
// Remove reference to res to allow res being garbage collected
this.res = null
// Destroy the response stream
util.destroy(res.on('error', noop), err)
// Use queueMicrotask to re-throw the error so it reaches uncaughtException
queueMicrotask(() => {
throw err
})
}
}
}
onData (chunk) {
return this.res.push(chunk)
}
onComplete (trailers) {
util.parseHeaders(trailers, this.trailers)
this.res.push(null)
}
onError (err) {
const { res, callback, body, opaque } = this
if (callback) {
// TODO: Does this need queueMicrotask?
this.callback = null
queueMicrotask(() => {
this.runInAsyncScope(callback, null, err, { opaque })
})
}
if (res) {
this.res = null
// Ensure all queued handlers are invoked before destroying res.
queueMicrotask(() => {
util.destroy(res.on('error', noop), err)
})
}
if (body) {
this.body = null
if (util.isStream(body)) {
body.on('error', noop)
util.destroy(body, err)
}
}
if (this.removeAbortListener) {
this.removeAbortListener()
this.removeAbortListener = null
}
}
}
function request (opts, callback) {
if (callback === undefined) {
return new Promise((resolve, reject) => {
request.call(this, opts, (err, data) => {
return err ? reject(err) : resolve(data)
})
})
}
try {
const handler = new RequestHandler(opts, callback)
this.dispatch(opts, handler)
} catch (err) {
if (typeof callback !== 'function') {
throw err
}
const opaque = opts?.opaque
queueMicrotask(() => callback(err, { opaque }))
}
}
module.exports = request
module.exports.RequestHandler = RequestHandler
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