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index.js
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index.js
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const { EventEmitter } = require('events')
const STREAM_DESTROYED = new Error('Stream was destroyed')
const PREMATURE_CLOSE = new Error('Premature close')
const queueTick = require('queue-tick')
const FIFO = require('fast-fifo')
const TextDecoder = require('text-decoder')
/* eslint-disable no-multi-spaces */
// 29 bits used total (4 from shared, 14 from read, and 11 from write)
const MAX = ((1 << 29) - 1)
// Shared state
const OPENING = 0b0001
const PREDESTROYING = 0b0010
const DESTROYING = 0b0100
const DESTROYED = 0b1000
const NOT_OPENING = MAX ^ OPENING
const NOT_PREDESTROYING = MAX ^ PREDESTROYING
// Read state (4 bit offset from shared state)
const READ_ACTIVE = 0b00000000000001 << 4
const READ_UPDATING = 0b00000000000010 << 4
const READ_PRIMARY = 0b00000000000100 << 4
const READ_QUEUED = 0b00000000001000 << 4
const READ_RESUMED = 0b00000000010000 << 4
const READ_PIPE_DRAINED = 0b00000000100000 << 4
const READ_ENDING = 0b00000001000000 << 4
const READ_EMIT_DATA = 0b00000010000000 << 4
const READ_EMIT_READABLE = 0b00000100000000 << 4
const READ_EMITTED_READABLE = 0b00001000000000 << 4
const READ_DONE = 0b00010000000000 << 4
const READ_NEXT_TICK = 0b00100000000000 << 4
const READ_NEEDS_PUSH = 0b01000000000000 << 4
const READ_READ_AHEAD = 0b10000000000000 << 4
// Combined read state
const READ_FLOWING = READ_RESUMED | READ_PIPE_DRAINED
const READ_ACTIVE_AND_NEEDS_PUSH = READ_ACTIVE | READ_NEEDS_PUSH
const READ_PRIMARY_AND_ACTIVE = READ_PRIMARY | READ_ACTIVE
const READ_EMIT_READABLE_AND_QUEUED = READ_EMIT_READABLE | READ_QUEUED
const READ_RESUMED_READ_AHEAD = READ_RESUMED | READ_READ_AHEAD
const READ_NOT_ACTIVE = MAX ^ READ_ACTIVE
const READ_NON_PRIMARY = MAX ^ READ_PRIMARY
const READ_NON_PRIMARY_AND_PUSHED = MAX ^ (READ_PRIMARY | READ_NEEDS_PUSH)
const READ_PUSHED = MAX ^ READ_NEEDS_PUSH
const READ_PAUSED = MAX ^ READ_RESUMED
const READ_NOT_QUEUED = MAX ^ (READ_QUEUED | READ_EMITTED_READABLE)
const READ_NOT_ENDING = MAX ^ READ_ENDING
const READ_PIPE_NOT_DRAINED = MAX ^ READ_FLOWING
const READ_NOT_NEXT_TICK = MAX ^ READ_NEXT_TICK
const READ_NOT_UPDATING = MAX ^ READ_UPDATING
const READ_NO_READ_AHEAD = MAX ^ READ_READ_AHEAD
const READ_PAUSED_NO_READ_AHEAD = MAX ^ READ_RESUMED_READ_AHEAD
// Write state (18 bit offset, 4 bit offset from shared state and 14 from read state)
const WRITE_ACTIVE = 0b00000000001 << 18
const WRITE_UPDATING = 0b00000000010 << 18
const WRITE_PRIMARY = 0b00000000100 << 18
const WRITE_QUEUED = 0b00000001000 << 18
const WRITE_UNDRAINED = 0b00000010000 << 18
const WRITE_DONE = 0b00000100000 << 18
const WRITE_EMIT_DRAIN = 0b00001000000 << 18
const WRITE_NEXT_TICK = 0b00010000000 << 18
const WRITE_WRITING = 0b00100000000 << 18
const WRITE_FINISHING = 0b01000000000 << 18
const WRITE_CORKED = 0b10000000000 << 18
const WRITE_NOT_ACTIVE = MAX ^ (WRITE_ACTIVE | WRITE_WRITING)
const WRITE_NON_PRIMARY = MAX ^ WRITE_PRIMARY
const WRITE_NOT_FINISHING = MAX ^ (WRITE_ACTIVE | WRITE_FINISHING)
const WRITE_DRAINED = MAX ^ WRITE_UNDRAINED
const WRITE_NOT_QUEUED = MAX ^ WRITE_QUEUED
const WRITE_NOT_NEXT_TICK = MAX ^ WRITE_NEXT_TICK
const WRITE_NOT_UPDATING = MAX ^ WRITE_UPDATING
const WRITE_NOT_CORKED = MAX ^ WRITE_CORKED
// Combined shared state
const ACTIVE = READ_ACTIVE | WRITE_ACTIVE
const NOT_ACTIVE = MAX ^ ACTIVE
const DONE = READ_DONE | WRITE_DONE
const DESTROY_STATUS = DESTROYING | DESTROYED | PREDESTROYING
const OPEN_STATUS = DESTROY_STATUS | OPENING
const AUTO_DESTROY = DESTROY_STATUS | DONE
const NON_PRIMARY = WRITE_NON_PRIMARY & READ_NON_PRIMARY
const ACTIVE_OR_TICKING = WRITE_NEXT_TICK | READ_NEXT_TICK
const TICKING = ACTIVE_OR_TICKING & NOT_ACTIVE
const IS_OPENING = OPEN_STATUS | TICKING
// Combined shared state and read state
const READ_PRIMARY_STATUS = OPEN_STATUS | READ_ENDING | READ_DONE
const READ_STATUS = OPEN_STATUS | READ_DONE | READ_QUEUED
const READ_ENDING_STATUS = OPEN_STATUS | READ_ENDING | READ_QUEUED
const READ_READABLE_STATUS = OPEN_STATUS | READ_EMIT_READABLE | READ_QUEUED | READ_EMITTED_READABLE
const SHOULD_NOT_READ = OPEN_STATUS | READ_ACTIVE | READ_ENDING | READ_DONE | READ_NEEDS_PUSH | READ_READ_AHEAD
const READ_BACKPRESSURE_STATUS = DESTROY_STATUS | READ_ENDING | READ_DONE
const READ_UPDATE_SYNC_STATUS = READ_UPDATING | OPEN_STATUS | READ_NEXT_TICK | READ_PRIMARY
// Combined write state
const WRITE_PRIMARY_STATUS = OPEN_STATUS | WRITE_FINISHING | WRITE_DONE
const WRITE_QUEUED_AND_UNDRAINED = WRITE_QUEUED | WRITE_UNDRAINED
const WRITE_QUEUED_AND_ACTIVE = WRITE_QUEUED | WRITE_ACTIVE
const WRITE_DRAIN_STATUS = WRITE_QUEUED | WRITE_UNDRAINED | OPEN_STATUS | WRITE_ACTIVE
const WRITE_STATUS = OPEN_STATUS | WRITE_ACTIVE | WRITE_QUEUED | WRITE_CORKED
const WRITE_PRIMARY_AND_ACTIVE = WRITE_PRIMARY | WRITE_ACTIVE
const WRITE_ACTIVE_AND_WRITING = WRITE_ACTIVE | WRITE_WRITING
const WRITE_FINISHING_STATUS = OPEN_STATUS | WRITE_FINISHING | WRITE_QUEUED_AND_ACTIVE | WRITE_DONE
const WRITE_BACKPRESSURE_STATUS = WRITE_UNDRAINED | DESTROY_STATUS | WRITE_FINISHING | WRITE_DONE
const WRITE_UPDATE_SYNC_STATUS = WRITE_UPDATING | OPEN_STATUS | WRITE_NEXT_TICK | WRITE_PRIMARY
const WRITE_DROP_DATA = WRITE_FINISHING | WRITE_DONE | DESTROY_STATUS
const asyncIterator = Symbol.asyncIterator || Symbol('asyncIterator')
class WritableState {
constructor (stream, { highWaterMark = 16384, map = null, mapWritable, byteLength, byteLengthWritable } = {}) {
this.stream = stream
this.queue = new FIFO()
this.highWaterMark = highWaterMark
this.buffered = 0
this.error = null
this.pipeline = null
this.drains = null // if we add more seldomly used helpers we might them into a subobject so its a single ptr
this.byteLength = byteLengthWritable || byteLength || defaultByteLength
this.map = mapWritable || map
this.afterWrite = afterWrite.bind(this)
this.afterUpdateNextTick = updateWriteNT.bind(this)
}
get ended () {
return (this.stream._duplexState & WRITE_DONE) !== 0
}
push (data) {
if ((this.stream._duplexState & WRITE_DROP_DATA) !== 0) return false
if (this.map !== null) data = this.map(data)
this.buffered += this.byteLength(data)
this.queue.push(data)
if (this.buffered < this.highWaterMark) {
this.stream._duplexState |= WRITE_QUEUED
return true
}
this.stream._duplexState |= WRITE_QUEUED_AND_UNDRAINED
return false
}
shift () {
const data = this.queue.shift()
this.buffered -= this.byteLength(data)
if (this.buffered === 0) this.stream._duplexState &= WRITE_NOT_QUEUED
return data
}
end (data) {
if (typeof data === 'function') this.stream.once('finish', data)
else if (data !== undefined && data !== null) this.push(data)
this.stream._duplexState = (this.stream._duplexState | WRITE_FINISHING) & WRITE_NON_PRIMARY
}
autoBatch (data, cb) {
const buffer = []
const stream = this.stream
buffer.push(data)
while ((stream._duplexState & WRITE_STATUS) === WRITE_QUEUED_AND_ACTIVE) {
buffer.push(stream._writableState.shift())
}
if ((stream._duplexState & OPEN_STATUS) !== 0) return cb(null)
stream._writev(buffer, cb)
}
update () {
const stream = this.stream
stream._duplexState |= WRITE_UPDATING
do {
while ((stream._duplexState & WRITE_STATUS) === WRITE_QUEUED) {
const data = this.shift()
stream._duplexState |= WRITE_ACTIVE_AND_WRITING
stream._write(data, this.afterWrite)
}
if ((stream._duplexState & WRITE_PRIMARY_AND_ACTIVE) === 0) this.updateNonPrimary()
} while (this.continueUpdate() === true)
stream._duplexState &= WRITE_NOT_UPDATING
}
updateNonPrimary () {
const stream = this.stream
if ((stream._duplexState & WRITE_FINISHING_STATUS) === WRITE_FINISHING) {
stream._duplexState = stream._duplexState | WRITE_ACTIVE
stream._final(afterFinal.bind(this))
return
}
if ((stream._duplexState & DESTROY_STATUS) === DESTROYING) {
if ((stream._duplexState & ACTIVE_OR_TICKING) === 0) {
stream._duplexState |= ACTIVE
stream._destroy(afterDestroy.bind(this))
}
return
}
if ((stream._duplexState & IS_OPENING) === OPENING) {
stream._duplexState = (stream._duplexState | ACTIVE) & NOT_OPENING
stream._open(afterOpen.bind(this))
}
}
continueUpdate () {
if ((this.stream._duplexState & WRITE_NEXT_TICK) === 0) return false
this.stream._duplexState &= WRITE_NOT_NEXT_TICK
return true
}
updateCallback () {
if ((this.stream._duplexState & WRITE_UPDATE_SYNC_STATUS) === WRITE_PRIMARY) this.update()
else this.updateNextTick()
}
updateNextTick () {
if ((this.stream._duplexState & WRITE_NEXT_TICK) !== 0) return
this.stream._duplexState |= WRITE_NEXT_TICK
if ((this.stream._duplexState & WRITE_UPDATING) === 0) queueTick(this.afterUpdateNextTick)
}
}
class ReadableState {
constructor (stream, { highWaterMark = 16384, map = null, mapReadable, byteLength, byteLengthReadable } = {}) {
this.stream = stream
this.queue = new FIFO()
this.highWaterMark = highWaterMark === 0 ? 1 : highWaterMark
this.buffered = 0
this.readAhead = highWaterMark > 0
this.error = null
this.pipeline = null
this.byteLength = byteLengthReadable || byteLength || defaultByteLength
this.map = mapReadable || map
this.pipeTo = null
this.afterRead = afterRead.bind(this)
this.afterUpdateNextTick = updateReadNT.bind(this)
}
get ended () {
return (this.stream._duplexState & READ_DONE) !== 0
}
pipe (pipeTo, cb) {
if (this.pipeTo !== null) throw new Error('Can only pipe to one destination')
if (typeof cb !== 'function') cb = null
this.stream._duplexState |= READ_PIPE_DRAINED
this.pipeTo = pipeTo
this.pipeline = new Pipeline(this.stream, pipeTo, cb)
if (cb) this.stream.on('error', noop) // We already error handle this so supress crashes
if (isStreamx(pipeTo)) {
pipeTo._writableState.pipeline = this.pipeline
if (cb) pipeTo.on('error', noop) // We already error handle this so supress crashes
pipeTo.on('finish', this.pipeline.finished.bind(this.pipeline)) // TODO: just call finished from pipeTo itself
} else {
const onerror = this.pipeline.done.bind(this.pipeline, pipeTo)
const onclose = this.pipeline.done.bind(this.pipeline, pipeTo, null) // onclose has a weird bool arg
pipeTo.on('error', onerror)
pipeTo.on('close', onclose)
pipeTo.on('finish', this.pipeline.finished.bind(this.pipeline))
}
pipeTo.on('drain', afterDrain.bind(this))
this.stream.emit('piping', pipeTo)
pipeTo.emit('pipe', this.stream)
}
push (data) {
const stream = this.stream
if (data === null) {
this.highWaterMark = 0
stream._duplexState = (stream._duplexState | READ_ENDING) & READ_NON_PRIMARY_AND_PUSHED
return false
}
if (this.map !== null) {
data = this.map(data)
if (data === null) {
stream._duplexState &= READ_PUSHED
return this.buffered < this.highWaterMark
}
}
this.buffered += this.byteLength(data)
this.queue.push(data)
stream._duplexState = (stream._duplexState | READ_QUEUED) & READ_PUSHED
return this.buffered < this.highWaterMark
}
shift () {
const data = this.queue.shift()
this.buffered -= this.byteLength(data)
if (this.buffered === 0) this.stream._duplexState &= READ_NOT_QUEUED
return data
}
unshift (data) {
const pending = [this.map !== null ? this.map(data) : data]
while (this.buffered > 0) pending.push(this.shift())
for (let i = 0; i < pending.length - 1; i++) {
const data = pending[i]
this.buffered += this.byteLength(data)
this.queue.push(data)
}
this.push(pending[pending.length - 1])
}
read () {
const stream = this.stream
if ((stream._duplexState & READ_STATUS) === READ_QUEUED) {
const data = this.shift()
if (this.pipeTo !== null && this.pipeTo.write(data) === false) stream._duplexState &= READ_PIPE_NOT_DRAINED
if ((stream._duplexState & READ_EMIT_DATA) !== 0) stream.emit('data', data)
return data
}
if (this.readAhead === false) {
stream._duplexState |= READ_READ_AHEAD
this.updateNextTick()
}
return null
}
drain () {
const stream = this.stream
while ((stream._duplexState & READ_STATUS) === READ_QUEUED && (stream._duplexState & READ_FLOWING) !== 0) {
const data = this.shift()
if (this.pipeTo !== null && this.pipeTo.write(data) === false) stream._duplexState &= READ_PIPE_NOT_DRAINED
if ((stream._duplexState & READ_EMIT_DATA) !== 0) stream.emit('data', data)
}
}
update () {
const stream = this.stream
stream._duplexState |= READ_UPDATING
do {
this.drain()
while (this.buffered < this.highWaterMark && (stream._duplexState & SHOULD_NOT_READ) === READ_READ_AHEAD) {
stream._duplexState |= READ_ACTIVE_AND_NEEDS_PUSH
stream._read(this.afterRead)
this.drain()
}
if ((stream._duplexState & READ_READABLE_STATUS) === READ_EMIT_READABLE_AND_QUEUED) {
stream._duplexState |= READ_EMITTED_READABLE
stream.emit('readable')
}
if ((stream._duplexState & READ_PRIMARY_AND_ACTIVE) === 0) this.updateNonPrimary()
} while (this.continueUpdate() === true)
stream._duplexState &= READ_NOT_UPDATING
}
updateNonPrimary () {
const stream = this.stream
if ((stream._duplexState & READ_ENDING_STATUS) === READ_ENDING) {
stream._duplexState = (stream._duplexState | READ_DONE) & READ_NOT_ENDING
stream.emit('end')
if ((stream._duplexState & AUTO_DESTROY) === DONE) stream._duplexState |= DESTROYING
if (this.pipeTo !== null) this.pipeTo.end()
}
if ((stream._duplexState & DESTROY_STATUS) === DESTROYING) {
if ((stream._duplexState & ACTIVE_OR_TICKING) === 0) {
stream._duplexState |= ACTIVE
stream._destroy(afterDestroy.bind(this))
}
return
}
if ((stream._duplexState & IS_OPENING) === OPENING) {
stream._duplexState = (stream._duplexState | ACTIVE) & NOT_OPENING
stream._open(afterOpen.bind(this))
}
}
continueUpdate () {
if ((this.stream._duplexState & READ_NEXT_TICK) === 0) return false
this.stream._duplexState &= READ_NOT_NEXT_TICK
return true
}
updateCallback () {
if ((this.stream._duplexState & READ_UPDATE_SYNC_STATUS) === READ_PRIMARY) this.update()
else this.updateNextTick()
}
updateNextTick () {
if ((this.stream._duplexState & READ_NEXT_TICK) !== 0) return
this.stream._duplexState |= READ_NEXT_TICK
if ((this.stream._duplexState & READ_UPDATING) === 0) queueTick(this.afterUpdateNextTick)
}
}
class TransformState {
constructor (stream) {
this.data = null
this.afterTransform = afterTransform.bind(stream)
this.afterFinal = null
}
}
class Pipeline {
constructor (src, dst, cb) {
this.from = src
this.to = dst
this.afterPipe = cb
this.error = null
this.pipeToFinished = false
}
finished () {
this.pipeToFinished = true
}
done (stream, err) {
if (err) this.error = err
if (stream === this.to) {
this.to = null
if (this.from !== null) {
if ((this.from._duplexState & READ_DONE) === 0 || !this.pipeToFinished) {
this.from.destroy(this.error || new Error('Writable stream closed prematurely'))
}
return
}
}
if (stream === this.from) {
this.from = null
if (this.to !== null) {
if ((stream._duplexState & READ_DONE) === 0) {
this.to.destroy(this.error || new Error('Readable stream closed before ending'))
}
return
}
}
if (this.afterPipe !== null) this.afterPipe(this.error)
this.to = this.from = this.afterPipe = null
}
}
function afterDrain () {
this.stream._duplexState |= READ_PIPE_DRAINED
this.updateCallback()
}
function afterFinal (err) {
const stream = this.stream
if (err) stream.destroy(err)
if ((stream._duplexState & DESTROY_STATUS) === 0) {
stream._duplexState |= WRITE_DONE
stream.emit('finish')
}
if ((stream._duplexState & AUTO_DESTROY) === DONE) {
stream._duplexState |= DESTROYING
}
stream._duplexState &= WRITE_NOT_FINISHING
// no need to wait the extra tick here, so we short circuit that
if ((stream._duplexState & WRITE_UPDATING) === 0) this.update()
else this.updateNextTick()
}
function afterDestroy (err) {
const stream = this.stream
if (!err && this.error !== STREAM_DESTROYED) err = this.error
if (err) stream.emit('error', err)
stream._duplexState |= DESTROYED
stream.emit('close')
const rs = stream._readableState
const ws = stream._writableState
if (rs !== null && rs.pipeline !== null) rs.pipeline.done(stream, err)
if (ws !== null) {
while (ws.drains !== null && ws.drains.length > 0) ws.drains.shift().resolve(false)
if (ws.pipeline !== null) ws.pipeline.done(stream, err)
}
}
function afterWrite (err) {
const stream = this.stream
if (err) stream.destroy(err)
stream._duplexState &= WRITE_NOT_ACTIVE
if (this.drains !== null) tickDrains(this.drains)
if ((stream._duplexState & WRITE_DRAIN_STATUS) === WRITE_UNDRAINED) {
stream._duplexState &= WRITE_DRAINED
if ((stream._duplexState & WRITE_EMIT_DRAIN) === WRITE_EMIT_DRAIN) {
stream.emit('drain')
}
}
this.updateCallback()
}
function afterRead (err) {
if (err) this.stream.destroy(err)
this.stream._duplexState &= READ_NOT_ACTIVE
if (this.readAhead === false && (this.stream._duplexState & READ_RESUMED) === 0) this.stream._duplexState &= READ_NO_READ_AHEAD
this.updateCallback()
}
function updateReadNT () {
if ((this.stream._duplexState & READ_UPDATING) === 0) {
this.stream._duplexState &= READ_NOT_NEXT_TICK
this.update()
}
}
function updateWriteNT () {
if ((this.stream._duplexState & WRITE_UPDATING) === 0) {
this.stream._duplexState &= WRITE_NOT_NEXT_TICK
this.update()
}
}
function tickDrains (drains) {
for (let i = 0; i < drains.length; i++) {
// drains.writes are monotonic, so if one is 0 its always the first one
if (--drains[i].writes === 0) {
drains.shift().resolve(true)
i--
}
}
}
function afterOpen (err) {
const stream = this.stream
if (err) stream.destroy(err)
if ((stream._duplexState & DESTROYING) === 0) {
if ((stream._duplexState & READ_PRIMARY_STATUS) === 0) stream._duplexState |= READ_PRIMARY
if ((stream._duplexState & WRITE_PRIMARY_STATUS) === 0) stream._duplexState |= WRITE_PRIMARY
stream.emit('open')
}
stream._duplexState &= NOT_ACTIVE
if (stream._writableState !== null) {
stream._writableState.updateCallback()
}
if (stream._readableState !== null) {
stream._readableState.updateCallback()
}
}
function afterTransform (err, data) {
if (data !== undefined && data !== null) this.push(data)
this._writableState.afterWrite(err)
}
function newListener (name) {
if (this._readableState !== null) {
if (name === 'data') {
this._duplexState |= (READ_EMIT_DATA | READ_RESUMED_READ_AHEAD)
this._readableState.updateNextTick()
}
if (name === 'readable') {
this._duplexState |= READ_EMIT_READABLE
this._readableState.updateNextTick()
}
}
if (this._writableState !== null) {
if (name === 'drain') {
this._duplexState |= WRITE_EMIT_DRAIN
this._writableState.updateNextTick()
}
}
}
class Stream extends EventEmitter {
constructor (opts) {
super()
this._duplexState = 0
this._readableState = null
this._writableState = null
if (opts) {
if (opts.open) this._open = opts.open
if (opts.destroy) this._destroy = opts.destroy
if (opts.predestroy) this._predestroy = opts.predestroy
if (opts.signal) {
opts.signal.addEventListener('abort', abort.bind(this))
}
}
this.on('newListener', newListener)
}
_open (cb) {
cb(null)
}
_destroy (cb) {
cb(null)
}
_predestroy () {
// does nothing
}
get readable () {
return this._readableState !== null ? true : undefined
}
get writable () {
return this._writableState !== null ? true : undefined
}
get destroyed () {
return (this._duplexState & DESTROYED) !== 0
}
get destroying () {
return (this._duplexState & DESTROY_STATUS) !== 0
}
destroy (err) {
if ((this._duplexState & DESTROY_STATUS) === 0) {
if (!err) err = STREAM_DESTROYED
this._duplexState = (this._duplexState | DESTROYING) & NON_PRIMARY
if (this._readableState !== null) {
this._readableState.highWaterMark = 0
this._readableState.error = err
}
if (this._writableState !== null) {
this._writableState.highWaterMark = 0
this._writableState.error = err
}
this._duplexState |= PREDESTROYING
this._predestroy()
this._duplexState &= NOT_PREDESTROYING
if (this._readableState !== null) this._readableState.updateNextTick()
if (this._writableState !== null) this._writableState.updateNextTick()
}
}
}
class Readable extends Stream {
constructor (opts) {
super(opts)
this._duplexState |= OPENING | WRITE_DONE | READ_READ_AHEAD
this._readableState = new ReadableState(this, opts)
if (opts) {
if (this._readableState.readAhead === false) this._duplexState &= READ_NO_READ_AHEAD
if (opts.read) this._read = opts.read
if (opts.eagerOpen) this._readableState.updateNextTick()
if (opts.encoding) this.setEncoding(opts.encoding)
}
}
setEncoding (encoding) {
const dec = new TextDecoder(encoding)
const map = this._readableState.map || echo
this._readableState.map = mapOrSkip
return this
function mapOrSkip (data) {
const next = dec.push(data)
return next === '' && (data.byteLength !== 0 || dec.remaining > 0) ? null : map(next)
}
}
_read (cb) {
cb(null)
}
pipe (dest, cb) {
this._readableState.updateNextTick()
this._readableState.pipe(dest, cb)
return dest
}
read () {
this._readableState.updateNextTick()
return this._readableState.read()
}
push (data) {
this._readableState.updateNextTick()
return this._readableState.push(data)
}
unshift (data) {
this._readableState.updateNextTick()
return this._readableState.unshift(data)
}
resume () {
this._duplexState |= READ_RESUMED_READ_AHEAD
this._readableState.updateNextTick()
return this
}
pause () {
this._duplexState &= (this._readableState.readAhead === false ? READ_PAUSED_NO_READ_AHEAD : READ_PAUSED)
return this
}
static _fromAsyncIterator (ite, opts) {
let destroy
const rs = new Readable({
...opts,
read (cb) {
ite.next().then(push).then(cb.bind(null, null)).catch(cb)
},
predestroy () {
destroy = ite.return()
},
destroy (cb) {
if (!destroy) return cb(null)
destroy.then(cb.bind(null, null)).catch(cb)
}
})
return rs
function push (data) {
if (data.done) rs.push(null)
else rs.push(data.value)
}
}
static from (data, opts) {
if (isReadStreamx(data)) return data
if (data[asyncIterator]) return this._fromAsyncIterator(data[asyncIterator](), opts)
if (!Array.isArray(data)) data = data === undefined ? [] : [data]
let i = 0
return new Readable({
...opts,
read (cb) {
this.push(i === data.length ? null : data[i++])
cb(null)
}
})
}
static isBackpressured (rs) {
return (rs._duplexState & READ_BACKPRESSURE_STATUS) !== 0 || rs._readableState.buffered >= rs._readableState.highWaterMark
}
static isPaused (rs) {
return (rs._duplexState & READ_RESUMED) === 0
}
[asyncIterator] () {
const stream = this
let error = null
let promiseResolve = null
let promiseReject = null
this.on('error', (err) => { error = err })
this.on('readable', onreadable)
this.on('close', onclose)
return {
[asyncIterator] () {
return this
},
next () {
return new Promise(function (resolve, reject) {
promiseResolve = resolve
promiseReject = reject
const data = stream.read()
if (data !== null) ondata(data)
else if ((stream._duplexState & DESTROYED) !== 0) ondata(null)
})
},
return () {
return destroy(null)
},
throw (err) {
return destroy(err)
}
}
function onreadable () {
if (promiseResolve !== null) ondata(stream.read())
}
function onclose () {
if (promiseResolve !== null) ondata(null)
}
function ondata (data) {
if (promiseReject === null) return
if (error) promiseReject(error)
else if (data === null && (stream._duplexState & READ_DONE) === 0) promiseReject(STREAM_DESTROYED)
else promiseResolve({ value: data, done: data === null })
promiseReject = promiseResolve = null
}
function destroy (err) {
stream.destroy(err)
return new Promise((resolve, reject) => {
if (stream._duplexState & DESTROYED) return resolve({ value: undefined, done: true })
stream.once('close', function () {
if (err) reject(err)
else resolve({ value: undefined, done: true })
})
})
}
}
}
class Writable extends Stream {
constructor (opts) {
super(opts)
this._duplexState |= OPENING | READ_DONE
this._writableState = new WritableState(this, opts)
if (opts) {
if (opts.writev) this._writev = opts.writev
if (opts.write) this._write = opts.write
if (opts.final) this._final = opts.final
if (opts.eagerOpen) this._writableState.updateNextTick()
}
}
cork () {
this._duplexState |= WRITE_CORKED
}
uncork () {
this._duplexState &= WRITE_NOT_CORKED
this._writableState.updateNextTick()
}
_writev (batch, cb) {
cb(null)
}
_write (data, cb) {
this._writableState.autoBatch(data, cb)
}
_final (cb) {
cb(null)
}
static isBackpressured (ws) {
return (ws._duplexState & WRITE_BACKPRESSURE_STATUS) !== 0
}
static drained (ws) {
if (ws.destroyed) return Promise.resolve(false)
const state = ws._writableState
const pending = (isWritev(ws) ? Math.min(1, state.queue.length) : state.queue.length)
const writes = pending + ((ws._duplexState & WRITE_WRITING) ? 1 : 0)
if (writes === 0) return Promise.resolve(true)
if (state.drains === null) state.drains = []
return new Promise((resolve) => {
state.drains.push({ writes, resolve })
})
}
write (data) {
this._writableState.updateNextTick()
return this._writableState.push(data)
}
end (data) {
this._writableState.updateNextTick()
this._writableState.end(data)
return this
}
}
class Duplex extends Readable { // and Writable
constructor (opts) {
super(opts)
this._duplexState = OPENING | (this._duplexState & READ_READ_AHEAD)
this._writableState = new WritableState(this, opts)
if (opts) {
if (opts.writev) this._writev = opts.writev
if (opts.write) this._write = opts.write
if (opts.final) this._final = opts.final
}
}
cork () {
this._duplexState |= WRITE_CORKED
}
uncork () {
this._duplexState &= WRITE_NOT_CORKED
this._writableState.updateNextTick()
}
_writev (batch, cb) {
cb(null)
}
_write (data, cb) {
this._writableState.autoBatch(data, cb)
}
_final (cb) {
cb(null)
}
write (data) {
this._writableState.updateNextTick()
return this._writableState.push(data)
}
end (data) {
this._writableState.updateNextTick()
this._writableState.end(data)
return this
}
}
class Transform extends Duplex {
constructor (opts) {
super(opts)
this._transformState = new TransformState(this)
if (opts) {
if (opts.transform) this._transform = opts.transform
if (opts.flush) this._flush = opts.flush
}
}
_write (data, cb) {
if (this._readableState.buffered >= this._readableState.highWaterMark) {
this._transformState.data = data
} else {
this._transform(data, this._transformState.afterTransform)
}
}
_read (cb) {
if (this._transformState.data !== null) {
const data = this._transformState.data
this._transformState.data = null
cb(null)
this._transform(data, this._transformState.afterTransform)
} else {
cb(null)
}
}