703 lines
18 KiB
JavaScript
703 lines
18 KiB
JavaScript
'use strict'
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const proc =
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typeof process === 'object' && process
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? process
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: {
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stdout: null,
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stderr: null,
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}
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const EE = require('events')
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const Stream = require('stream')
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const stringdecoder = require('string_decoder')
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const SD = stringdecoder.StringDecoder
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const EOF = Symbol('EOF')
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const MAYBE_EMIT_END = Symbol('maybeEmitEnd')
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const EMITTED_END = Symbol('emittedEnd')
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const EMITTING_END = Symbol('emittingEnd')
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const EMITTED_ERROR = Symbol('emittedError')
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const CLOSED = Symbol('closed')
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const READ = Symbol('read')
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const FLUSH = Symbol('flush')
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const FLUSHCHUNK = Symbol('flushChunk')
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const ENCODING = Symbol('encoding')
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const DECODER = Symbol('decoder')
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const FLOWING = Symbol('flowing')
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const PAUSED = Symbol('paused')
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const RESUME = Symbol('resume')
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const BUFFER = Symbol('buffer')
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const PIPES = Symbol('pipes')
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const BUFFERLENGTH = Symbol('bufferLength')
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const BUFFERPUSH = Symbol('bufferPush')
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const BUFFERSHIFT = Symbol('bufferShift')
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const OBJECTMODE = Symbol('objectMode')
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// internal event when stream is destroyed
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const DESTROYED = Symbol('destroyed')
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// internal event when stream has an error
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const ERROR = Symbol('error')
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const EMITDATA = Symbol('emitData')
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const EMITEND = Symbol('emitEnd')
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const EMITEND2 = Symbol('emitEnd2')
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const ASYNC = Symbol('async')
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const ABORT = Symbol('abort')
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const ABORTED = Symbol('aborted')
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const SIGNAL = Symbol('signal')
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const defer = fn => Promise.resolve().then(fn)
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// TODO remove when Node v8 support drops
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const doIter = global._MP_NO_ITERATOR_SYMBOLS_ !== '1'
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const ASYNCITERATOR =
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(doIter && Symbol.asyncIterator) || Symbol('asyncIterator not implemented')
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const ITERATOR =
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(doIter && Symbol.iterator) || Symbol('iterator not implemented')
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// events that mean 'the stream is over'
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// these are treated specially, and re-emitted
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// if they are listened for after emitting.
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const isEndish = ev => ev === 'end' || ev === 'finish' || ev === 'prefinish'
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const isArrayBuffer = b =>
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b instanceof ArrayBuffer ||
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(typeof b === 'object' &&
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b.constructor &&
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b.constructor.name === 'ArrayBuffer' &&
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b.byteLength >= 0)
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const isArrayBufferView = b => !Buffer.isBuffer(b) && ArrayBuffer.isView(b)
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class Pipe {
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constructor(src, dest, opts) {
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this.src = src
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this.dest = dest
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this.opts = opts
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this.ondrain = () => src[RESUME]()
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dest.on('drain', this.ondrain)
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}
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unpipe() {
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this.dest.removeListener('drain', this.ondrain)
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}
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// istanbul ignore next - only here for the prototype
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proxyErrors() {}
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end() {
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this.unpipe()
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if (this.opts.end) this.dest.end()
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}
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}
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class PipeProxyErrors extends Pipe {
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unpipe() {
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this.src.removeListener('error', this.proxyErrors)
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super.unpipe()
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}
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constructor(src, dest, opts) {
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super(src, dest, opts)
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this.proxyErrors = er => dest.emit('error', er)
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src.on('error', this.proxyErrors)
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}
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}
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class Minipass extends Stream {
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constructor(options) {
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super()
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this[FLOWING] = false
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// whether we're explicitly paused
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this[PAUSED] = false
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this[PIPES] = []
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this[BUFFER] = []
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this[OBJECTMODE] = (options && options.objectMode) || false
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if (this[OBJECTMODE]) this[ENCODING] = null
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else this[ENCODING] = (options && options.encoding) || null
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if (this[ENCODING] === 'buffer') this[ENCODING] = null
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this[ASYNC] = (options && !!options.async) || false
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this[DECODER] = this[ENCODING] ? new SD(this[ENCODING]) : null
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this[EOF] = false
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this[EMITTED_END] = false
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this[EMITTING_END] = false
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this[CLOSED] = false
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this[EMITTED_ERROR] = null
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this.writable = true
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this.readable = true
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this[BUFFERLENGTH] = 0
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this[DESTROYED] = false
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if (options && options.debugExposeBuffer === true) {
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Object.defineProperty(this, 'buffer', { get: () => this[BUFFER] })
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}
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if (options && options.debugExposePipes === true) {
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Object.defineProperty(this, 'pipes', { get: () => this[PIPES] })
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}
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this[SIGNAL] = options && options.signal
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this[ABORTED] = false
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if (this[SIGNAL]) {
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this[SIGNAL].addEventListener('abort', () => this[ABORT]())
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if (this[SIGNAL].aborted) {
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this[ABORT]()
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}
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}
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}
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get bufferLength() {
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return this[BUFFERLENGTH]
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}
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get encoding() {
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return this[ENCODING]
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}
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set encoding(enc) {
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if (this[OBJECTMODE]) throw new Error('cannot set encoding in objectMode')
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if (
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this[ENCODING] &&
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enc !== this[ENCODING] &&
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((this[DECODER] && this[DECODER].lastNeed) || this[BUFFERLENGTH])
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)
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throw new Error('cannot change encoding')
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if (this[ENCODING] !== enc) {
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this[DECODER] = enc ? new SD(enc) : null
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if (this[BUFFER].length)
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this[BUFFER] = this[BUFFER].map(chunk => this[DECODER].write(chunk))
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}
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this[ENCODING] = enc
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}
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setEncoding(enc) {
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this.encoding = enc
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}
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get objectMode() {
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return this[OBJECTMODE]
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}
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set objectMode(om) {
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this[OBJECTMODE] = this[OBJECTMODE] || !!om
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}
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get ['async']() {
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return this[ASYNC]
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}
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set ['async'](a) {
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this[ASYNC] = this[ASYNC] || !!a
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}
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// drop everything and get out of the flow completely
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[ABORT]() {
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this[ABORTED] = true
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this.emit('abort', this[SIGNAL].reason)
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this.destroy(this[SIGNAL].reason)
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}
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get aborted() {
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return this[ABORTED]
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}
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set aborted(_) {}
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write(chunk, encoding, cb) {
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if (this[ABORTED]) return false
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if (this[EOF]) throw new Error('write after end')
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if (this[DESTROYED]) {
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this.emit(
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'error',
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Object.assign(
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new Error('Cannot call write after a stream was destroyed'),
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{ code: 'ERR_STREAM_DESTROYED' }
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)
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)
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return true
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}
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if (typeof encoding === 'function') (cb = encoding), (encoding = 'utf8')
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if (!encoding) encoding = 'utf8'
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const fn = this[ASYNC] ? defer : f => f()
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// convert array buffers and typed array views into buffers
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// at some point in the future, we may want to do the opposite!
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// leave strings and buffers as-is
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// anything else switches us into object mode
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if (!this[OBJECTMODE] && !Buffer.isBuffer(chunk)) {
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if (isArrayBufferView(chunk))
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chunk = Buffer.from(chunk.buffer, chunk.byteOffset, chunk.byteLength)
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else if (isArrayBuffer(chunk)) chunk = Buffer.from(chunk)
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else if (typeof chunk !== 'string')
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// use the setter so we throw if we have encoding set
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this.objectMode = true
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}
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// handle object mode up front, since it's simpler
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// this yields better performance, fewer checks later.
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if (this[OBJECTMODE]) {
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/* istanbul ignore if - maybe impossible? */
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if (this.flowing && this[BUFFERLENGTH] !== 0) this[FLUSH](true)
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if (this.flowing) this.emit('data', chunk)
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else this[BUFFERPUSH](chunk)
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if (this[BUFFERLENGTH] !== 0) this.emit('readable')
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if (cb) fn(cb)
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return this.flowing
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}
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// at this point the chunk is a buffer or string
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// don't buffer it up or send it to the decoder
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if (!chunk.length) {
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if (this[BUFFERLENGTH] !== 0) this.emit('readable')
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if (cb) fn(cb)
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return this.flowing
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}
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// fast-path writing strings of same encoding to a stream with
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// an empty buffer, skipping the buffer/decoder dance
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if (
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typeof chunk === 'string' &&
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// unless it is a string already ready for us to use
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!(encoding === this[ENCODING] && !this[DECODER].lastNeed)
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) {
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chunk = Buffer.from(chunk, encoding)
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}
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if (Buffer.isBuffer(chunk) && this[ENCODING])
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chunk = this[DECODER].write(chunk)
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// Note: flushing CAN potentially switch us into not-flowing mode
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if (this.flowing && this[BUFFERLENGTH] !== 0) this[FLUSH](true)
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if (this.flowing) this.emit('data', chunk)
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else this[BUFFERPUSH](chunk)
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if (this[BUFFERLENGTH] !== 0) this.emit('readable')
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if (cb) fn(cb)
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return this.flowing
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}
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read(n) {
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if (this[DESTROYED]) return null
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if (this[BUFFERLENGTH] === 0 || n === 0 || n > this[BUFFERLENGTH]) {
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this[MAYBE_EMIT_END]()
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return null
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}
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if (this[OBJECTMODE]) n = null
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if (this[BUFFER].length > 1 && !this[OBJECTMODE]) {
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if (this.encoding) this[BUFFER] = [this[BUFFER].join('')]
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else this[BUFFER] = [Buffer.concat(this[BUFFER], this[BUFFERLENGTH])]
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}
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const ret = this[READ](n || null, this[BUFFER][0])
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this[MAYBE_EMIT_END]()
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return ret
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}
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[READ](n, chunk) {
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if (n === chunk.length || n === null) this[BUFFERSHIFT]()
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else {
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this[BUFFER][0] = chunk.slice(n)
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chunk = chunk.slice(0, n)
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this[BUFFERLENGTH] -= n
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}
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this.emit('data', chunk)
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if (!this[BUFFER].length && !this[EOF]) this.emit('drain')
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return chunk
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}
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end(chunk, encoding, cb) {
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if (typeof chunk === 'function') (cb = chunk), (chunk = null)
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if (typeof encoding === 'function') (cb = encoding), (encoding = 'utf8')
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if (chunk) this.write(chunk, encoding)
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if (cb) this.once('end', cb)
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this[EOF] = true
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this.writable = false
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// if we haven't written anything, then go ahead and emit,
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// even if we're not reading.
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// we'll re-emit if a new 'end' listener is added anyway.
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// This makes MP more suitable to write-only use cases.
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if (this.flowing || !this[PAUSED]) this[MAYBE_EMIT_END]()
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return this
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}
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// don't let the internal resume be overwritten
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[RESUME]() {
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if (this[DESTROYED]) return
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this[PAUSED] = false
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this[FLOWING] = true
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this.emit('resume')
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if (this[BUFFER].length) this[FLUSH]()
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else if (this[EOF]) this[MAYBE_EMIT_END]()
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else this.emit('drain')
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}
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resume() {
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return this[RESUME]()
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}
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pause() {
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this[FLOWING] = false
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this[PAUSED] = true
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}
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get destroyed() {
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return this[DESTROYED]
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}
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get flowing() {
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return this[FLOWING]
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}
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get paused() {
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return this[PAUSED]
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}
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[BUFFERPUSH](chunk) {
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if (this[OBJECTMODE]) this[BUFFERLENGTH] += 1
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else this[BUFFERLENGTH] += chunk.length
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this[BUFFER].push(chunk)
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}
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[BUFFERSHIFT]() {
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if (this[OBJECTMODE]) this[BUFFERLENGTH] -= 1
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else this[BUFFERLENGTH] -= this[BUFFER][0].length
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return this[BUFFER].shift()
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}
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[FLUSH](noDrain) {
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do {} while (this[FLUSHCHUNK](this[BUFFERSHIFT]()) && this[BUFFER].length)
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if (!noDrain && !this[BUFFER].length && !this[EOF]) this.emit('drain')
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}
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[FLUSHCHUNK](chunk) {
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this.emit('data', chunk)
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return this.flowing
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}
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pipe(dest, opts) {
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if (this[DESTROYED]) return
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const ended = this[EMITTED_END]
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opts = opts || {}
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if (dest === proc.stdout || dest === proc.stderr) opts.end = false
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else opts.end = opts.end !== false
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opts.proxyErrors = !!opts.proxyErrors
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// piping an ended stream ends immediately
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if (ended) {
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if (opts.end) dest.end()
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} else {
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this[PIPES].push(
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!opts.proxyErrors
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? new Pipe(this, dest, opts)
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: new PipeProxyErrors(this, dest, opts)
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)
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if (this[ASYNC]) defer(() => this[RESUME]())
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else this[RESUME]()
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}
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return dest
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}
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unpipe(dest) {
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const p = this[PIPES].find(p => p.dest === dest)
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if (p) {
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this[PIPES].splice(this[PIPES].indexOf(p), 1)
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p.unpipe()
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}
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}
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addListener(ev, fn) {
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return this.on(ev, fn)
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}
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on(ev, fn) {
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const ret = super.on(ev, fn)
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if (ev === 'data' && !this[PIPES].length && !this.flowing) this[RESUME]()
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else if (ev === 'readable' && this[BUFFERLENGTH] !== 0)
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super.emit('readable')
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else if (isEndish(ev) && this[EMITTED_END]) {
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super.emit(ev)
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this.removeAllListeners(ev)
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} else if (ev === 'error' && this[EMITTED_ERROR]) {
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if (this[ASYNC]) defer(() => fn.call(this, this[EMITTED_ERROR]))
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else fn.call(this, this[EMITTED_ERROR])
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}
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return ret
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}
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get emittedEnd() {
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return this[EMITTED_END]
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}
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[MAYBE_EMIT_END]() {
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if (
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!this[EMITTING_END] &&
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!this[EMITTED_END] &&
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!this[DESTROYED] &&
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this[BUFFER].length === 0 &&
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this[EOF]
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) {
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this[EMITTING_END] = true
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this.emit('end')
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this.emit('prefinish')
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this.emit('finish')
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if (this[CLOSED]) this.emit('close')
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this[EMITTING_END] = false
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}
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}
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emit(ev, data, ...extra) {
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// error and close are only events allowed after calling destroy()
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if (ev !== 'error' && ev !== 'close' && ev !== DESTROYED && this[DESTROYED])
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return
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else if (ev === 'data') {
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return !this[OBJECTMODE] && !data
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? false
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: this[ASYNC]
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? defer(() => this[EMITDATA](data))
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: this[EMITDATA](data)
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} else if (ev === 'end') {
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return this[EMITEND]()
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} else if (ev === 'close') {
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this[CLOSED] = true
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// don't emit close before 'end' and 'finish'
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if (!this[EMITTED_END] && !this[DESTROYED]) return
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const ret = super.emit('close')
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this.removeAllListeners('close')
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return ret
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} else if (ev === 'error') {
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this[EMITTED_ERROR] = data
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super.emit(ERROR, data)
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const ret =
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!this[SIGNAL] || this.listeners('error').length
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? super.emit('error', data)
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: false
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this[MAYBE_EMIT_END]()
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return ret
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} else if (ev === 'resume') {
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const ret = super.emit('resume')
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this[MAYBE_EMIT_END]()
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return ret
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} else if (ev === 'finish' || ev === 'prefinish') {
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const ret = super.emit(ev)
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this.removeAllListeners(ev)
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return ret
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}
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// Some other unknown event
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const ret = super.emit(ev, data, ...extra)
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this[MAYBE_EMIT_END]()
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return ret
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}
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[EMITDATA](data) {
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for (const p of this[PIPES]) {
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if (p.dest.write(data) === false) this.pause()
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}
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const ret = super.emit('data', data)
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this[MAYBE_EMIT_END]()
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return ret
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}
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[EMITEND]() {
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if (this[EMITTED_END]) return
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this[EMITTED_END] = true
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this.readable = false
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if (this[ASYNC]) defer(() => this[EMITEND2]())
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else this[EMITEND2]()
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}
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[EMITEND2]() {
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if (this[DECODER]) {
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const data = this[DECODER].end()
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if (data) {
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for (const p of this[PIPES]) {
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p.dest.write(data)
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}
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super.emit('data', data)
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}
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}
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for (const p of this[PIPES]) {
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p.end()
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}
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const ret = super.emit('end')
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this.removeAllListeners('end')
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return ret
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}
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// const all = await stream.collect()
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collect() {
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const buf = []
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if (!this[OBJECTMODE]) buf.dataLength = 0
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// set the promise first, in case an error is raised
|
|
// by triggering the flow here.
|
|
const p = this.promise()
|
|
this.on('data', c => {
|
|
buf.push(c)
|
|
if (!this[OBJECTMODE]) buf.dataLength += c.length
|
|
})
|
|
return p.then(() => buf)
|
|
}
|
|
|
|
// const data = await stream.concat()
|
|
concat() {
|
|
return this[OBJECTMODE]
|
|
? Promise.reject(new Error('cannot concat in objectMode'))
|
|
: this.collect().then(buf =>
|
|
this[OBJECTMODE]
|
|
? Promise.reject(new Error('cannot concat in objectMode'))
|
|
: this[ENCODING]
|
|
? buf.join('')
|
|
: Buffer.concat(buf, buf.dataLength)
|
|
)
|
|
}
|
|
|
|
// stream.promise().then(() => done, er => emitted error)
|
|
promise() {
|
|
return new Promise((resolve, reject) => {
|
|
this.on(DESTROYED, () => reject(new Error('stream destroyed')))
|
|
this.on('error', er => reject(er))
|
|
this.on('end', () => resolve())
|
|
})
|
|
}
|
|
|
|
// for await (let chunk of stream)
|
|
[ASYNCITERATOR]() {
|
|
let stopped = false
|
|
const stop = () => {
|
|
this.pause()
|
|
stopped = true
|
|
return Promise.resolve({ done: true })
|
|
}
|
|
const next = () => {
|
|
if (stopped) return stop()
|
|
const res = this.read()
|
|
if (res !== null) return Promise.resolve({ done: false, value: res })
|
|
|
|
if (this[EOF]) return stop()
|
|
|
|
let resolve = null
|
|
let reject = null
|
|
const onerr = er => {
|
|
this.removeListener('data', ondata)
|
|
this.removeListener('end', onend)
|
|
this.removeListener(DESTROYED, ondestroy)
|
|
stop()
|
|
reject(er)
|
|
}
|
|
const ondata = value => {
|
|
this.removeListener('error', onerr)
|
|
this.removeListener('end', onend)
|
|
this.removeListener(DESTROYED, ondestroy)
|
|
this.pause()
|
|
resolve({ value: value, done: !!this[EOF] })
|
|
}
|
|
const onend = () => {
|
|
this.removeListener('error', onerr)
|
|
this.removeListener('data', ondata)
|
|
this.removeListener(DESTROYED, ondestroy)
|
|
stop()
|
|
resolve({ done: true })
|
|
}
|
|
const ondestroy = () => onerr(new Error('stream destroyed'))
|
|
return new Promise((res, rej) => {
|
|
reject = rej
|
|
resolve = res
|
|
this.once(DESTROYED, ondestroy)
|
|
this.once('error', onerr)
|
|
this.once('end', onend)
|
|
this.once('data', ondata)
|
|
})
|
|
}
|
|
|
|
return {
|
|
next,
|
|
throw: stop,
|
|
return: stop,
|
|
[ASYNCITERATOR]() {
|
|
return this
|
|
},
|
|
}
|
|
}
|
|
|
|
// for (let chunk of stream)
|
|
[ITERATOR]() {
|
|
let stopped = false
|
|
const stop = () => {
|
|
this.pause()
|
|
this.removeListener(ERROR, stop)
|
|
this.removeListener(DESTROYED, stop)
|
|
this.removeListener('end', stop)
|
|
stopped = true
|
|
return { done: true }
|
|
}
|
|
|
|
const next = () => {
|
|
if (stopped) return stop()
|
|
const value = this.read()
|
|
return value === null ? stop() : { value }
|
|
}
|
|
this.once('end', stop)
|
|
this.once(ERROR, stop)
|
|
this.once(DESTROYED, stop)
|
|
|
|
return {
|
|
next,
|
|
throw: stop,
|
|
return: stop,
|
|
[ITERATOR]() {
|
|
return this
|
|
},
|
|
}
|
|
}
|
|
|
|
destroy(er) {
|
|
if (this[DESTROYED]) {
|
|
if (er) this.emit('error', er)
|
|
else this.emit(DESTROYED)
|
|
return this
|
|
}
|
|
|
|
this[DESTROYED] = true
|
|
|
|
// throw away all buffered data, it's never coming out
|
|
this[BUFFER].length = 0
|
|
this[BUFFERLENGTH] = 0
|
|
|
|
if (typeof this.close === 'function' && !this[CLOSED]) this.close()
|
|
|
|
if (er) this.emit('error', er)
|
|
// if no error to emit, still reject pending promises
|
|
else this.emit(DESTROYED)
|
|
|
|
return this
|
|
}
|
|
|
|
static isStream(s) {
|
|
return (
|
|
!!s &&
|
|
(s instanceof Minipass ||
|
|
s instanceof Stream ||
|
|
(s instanceof EE &&
|
|
// readable
|
|
(typeof s.pipe === 'function' ||
|
|
// writable
|
|
(typeof s.write === 'function' && typeof s.end === 'function'))))
|
|
)
|
|
}
|
|
}
|
|
|
|
exports.Minipass = Minipass
|