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