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|
'use strict'
const {
Readable,
Duplex,
PassThrough
} = require('stream')
const {
InvalidArgumentError,
InvalidReturnValueError,
RequestAbortedError
} = require('../core/errors')
const util = require('../core/util')
const { AsyncResource } = require('async_hooks')
const { addSignal, removeSignal } = require('./abort-signal')
const assert = require('assert')
const kResume = Symbol('resume')
class PipelineRequest extends Readable {
constructor () {
super({ autoDestroy: true })
this[kResume] = null
}
_read () {
const { [kResume]: resume } = this
if (resume) {
this[kResume] = null
resume()
}
}
_destroy (err, callback) {
this._read()
callback(err)
}
}
class PipelineResponse extends Readable {
constructor (resume) {
super({ autoDestroy: true })
this[kResume] = resume
}
_read () {
this[kResume]()
}
_destroy (err, callback) {
if (!err && !this._readableState.endEmitted) {
err = new RequestAbortedError()
}
callback(err)
}
}
class PipelineHandler extends AsyncResource {
constructor (opts, handler) {
if (!opts || typeof opts !== 'object') {
throw new InvalidArgumentError('invalid opts')
}
if (typeof handler !== 'function') {
throw new InvalidArgumentError('invalid handler')
}
const { signal, method, opaque, onInfo, responseHeaders } = opts
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_PIPELINE')
this.opaque = opaque || null
this.responseHeaders = responseHeaders || null
this.handler = handler
this.abort = null
this.context = null
this.onInfo = onInfo || null
this.req = new PipelineRequest().on('error', util.nop)
this.ret = new Duplex({
readableObjectMode: opts.objectMode,
autoDestroy: true,
read: () => {
const { body } = this
if (body && body.resume) {
body.resume()
}
},
write: (chunk, encoding, callback) => {
const { req } = this
if (req.push(chunk, encoding) || req._readableState.destroyed) {
callback()
} else {
req[kResume] = callback
}
},
destroy: (err, callback) => {
const { body, req, res, ret, abort } = this
if (!err && !ret._readableState.endEmitted) {
err = new RequestAbortedError()
}
if (abort && err) {
abort()
}
util.destroy(body, err)
util.destroy(req, err)
util.destroy(res, err)
removeSignal(this)
callback(err)
}
}).on('prefinish', () => {
const { req } = this
// Node < 15 does not call _final in same tick.
req.push(null)
})
this.res = null
addSignal(this, signal)
}
onConnect (abort, context) {
const { ret, res } = this
assert(!res, 'pipeline cannot be retried')
if (ret.destroyed) {
throw new RequestAbortedError()
}
this.abort = abort
this.context = context
}
onHeaders (statusCode, rawHeaders, resume) {
const { opaque, handler, context } = this
if (statusCode < 200) {
if (this.onInfo) {
const headers = this.responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
this.onInfo({ statusCode, headers })
}
return
}
this.res = new PipelineResponse(resume)
let body
try {
this.handler = null
const headers = this.responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
body = this.runInAsyncScope(handler, null, {
statusCode,
headers,
opaque,
body: this.res,
context
})
} catch (err) {
this.res.on('error', util.nop)
throw err
}
if (!body || typeof body.on !== 'function') {
throw new InvalidReturnValueError('expected Readable')
}
body
.on('data', (chunk) => {
const { ret, body } = this
if (!ret.push(chunk) && body.pause) {
body.pause()
}
})
.on('error', (err) => {
const { ret } = this
util.destroy(ret, err)
})
.on('end', () => {
const { ret } = this
ret.push(null)
})
.on('close', () => {
const { ret } = this
if (!ret._readableState.ended) {
util.destroy(ret, new RequestAbortedError())
}
})
this.body = body
}
onData (chunk) {
const { res } = this
return res.push(chunk)
}
onComplete (trailers) {
const { res } = this
res.push(null)
}
onError (err) {
const { ret } = this
this.handler = null
util.destroy(ret, err)
}
}
function pipeline (opts, handler) {
try {
const pipelineHandler = new PipelineHandler(opts, handler)
this.dispatch({ ...opts, body: pipelineHandler.req }, pipelineHandler)
return pipelineHandler.ret
} catch (err) {
return new PassThrough().destroy(err)
}
}
module.exports = pipeline
|
