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|
'use strict'
const { finished, PassThrough } = require('stream')
const {
InvalidArgumentError,
InvalidReturnValueError,
RequestAbortedError
} = require('../core/errors')
const util = require('../core/util')
const { getResolveErrorBodyCallback } = require('./util')
const { AsyncResource } = require('async_hooks')
const { addSignal, removeSignal } = require('./abort-signal')
class StreamHandler extends AsyncResource {
constructor (opts, factory, callback) {
if (!opts || typeof opts !== 'object') {
throw new InvalidArgumentError('invalid opts')
}
const { signal, method, opaque, body, onInfo, responseHeaders, throwOnError } = opts
try {
if (typeof callback !== 'function') {
throw new InvalidArgumentError('invalid callback')
}
if (typeof factory !== 'function') {
throw new InvalidArgumentError('invalid factory')
}
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_STREAM')
} catch (err) {
if (util.isStream(body)) {
util.destroy(body.on('error', util.nop), err)
}
throw err
}
this.responseHeaders = responseHeaders || null
this.opaque = opaque || null
this.factory = factory
this.callback = callback
this.res = null
this.abort = null
this.context = null
this.trailers = null
this.body = body
this.onInfo = onInfo || null
this.throwOnError = throwOnError || false
if (util.isStream(body)) {
body.on('error', (err) => {
this.onError(err)
})
}
addSignal(this, signal)
}
onConnect (abort, context) {
if (!this.callback) {
throw new RequestAbortedError()
}
this.abort = abort
this.context = context
}
onHeaders (statusCode, rawHeaders, resume, statusMessage) {
const { factory, opaque, context, callback, responseHeaders } = this
const headers = responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
if (statusCode < 200) {
if (this.onInfo) {
this.onInfo({ statusCode, headers })
}
return
}
this.factory = null
let res
if (this.throwOnError && statusCode >= 400) {
const parsedHeaders = responseHeaders === 'raw' ? util.parseHeaders(rawHeaders) : headers
const contentType = parsedHeaders['content-type']
res = new PassThrough()
this.callback = null
this.runInAsyncScope(getResolveErrorBodyCallback, null,
{ callback, body: res, contentType, statusCode, statusMessage, headers }
)
} else {
if (factory === null) {
return
}
res = this.runInAsyncScope(factory, null, {
statusCode,
headers,
opaque,
context
})
if (
!res ||
typeof res.write !== 'function' ||
typeof res.end !== 'function' ||
typeof res.on !== 'function'
) {
throw new InvalidReturnValueError('expected Writable')
}
// TODO: Avoid finished. It registers an unnecessary amount of listeners.
finished(res, { readable: false }, (err) => {
const { callback, res, opaque, trailers, abort } = this
this.res = null
if (err || !res.readable) {
util.destroy(res, err)
}
this.callback = null
this.runInAsyncScope(callback, null, err || null, { opaque, trailers })
if (err) {
abort()
}
})
}
res.on('drain', resume)
this.res = res
const needDrain = res.writableNeedDrain !== undefined
? res.writableNeedDrain
: res._writableState && res._writableState.needDrain
return needDrain !== true
}
onData (chunk) {
const { res } = this
return res ? res.write(chunk) : true
}
onComplete (trailers) {
const { res } = this
removeSignal(this)
if (!res) {
return
}
this.trailers = util.parseHeaders(trailers)
res.end()
}
onError (err) {
const { res, callback, opaque, body } = this
removeSignal(this)
this.factory = null
if (res) {
this.res = null
util.destroy(res, err)
} else if (callback) {
this.callback = null
queueMicrotask(() => {
this.runInAsyncScope(callback, null, err, { opaque })
})
}
if (body) {
this.body = null
util.destroy(body, err)
}
}
}
function stream (opts, factory, callback) {
if (callback === undefined) {
return new Promise((resolve, reject) => {
stream.call(this, opts, factory, (err, data) => {
return err ? reject(err) : resolve(data)
})
})
}
try {
this.dispatch(opts, new StreamHandler(opts, factory, callback))
} catch (err) {
if (typeof callback !== 'function') {
throw err
}
const opaque = opts && opts.opaque
queueMicrotask(() => callback(err, { opaque }))
}
}
module.exports = stream
|
