129 lines
4.4 KiB
JavaScript
129 lines
4.4 KiB
JavaScript
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// a duplex stream is just a stream that is both readable and writable.
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// Since JS doesn't have multiple prototype inheritance, this class
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// prototypically inherits from Readable, and then parasitically from
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// Writable.
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'use strict'
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const {
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ObjectDefineProperties,
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ObjectGetOwnPropertyDescriptor,
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ObjectKeys,
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ObjectSetPrototypeOf
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} = require('../../ours/primordials')
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module.exports = Duplex
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const Readable = require('./readable')
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const Writable = require('./writable')
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ObjectSetPrototypeOf(Duplex.prototype, Readable.prototype)
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ObjectSetPrototypeOf(Duplex, Readable)
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{
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const keys = ObjectKeys(Writable.prototype) // Allow the keys array to be GC'ed.
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for (let i = 0; i < keys.length; i++) {
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const method = keys[i]
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if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]
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}
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}
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function Duplex(options) {
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if (!(this instanceof Duplex)) return new Duplex(options)
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Readable.call(this, options)
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Writable.call(this, options)
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if (options) {
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this.allowHalfOpen = options.allowHalfOpen !== false
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if (options.readable === false) {
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this._readableState.readable = false
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this._readableState.ended = true
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this._readableState.endEmitted = true
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}
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if (options.writable === false) {
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this._writableState.writable = false
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this._writableState.ending = true
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this._writableState.ended = true
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this._writableState.finished = true
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}
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} else {
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this.allowHalfOpen = true
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}
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}
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ObjectDefineProperties(Duplex.prototype, {
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writable: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writable'),
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writableHighWaterMark: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableHighWaterMark'),
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writableObjectMode: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableObjectMode'),
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writableBuffer: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableBuffer'),
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writableLength: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableLength'),
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writableFinished: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableFinished'),
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writableCorked: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableCorked'),
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writableEnded: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableEnded'),
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writableNeedDrain: ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableNeedDrain'),
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destroyed: {
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get() {
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if (this._readableState === undefined || this._writableState === undefined) {
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return false
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}
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return this._readableState.destroyed && this._writableState.destroyed
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},
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set(value) {
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// Backward compatibility, the user is explicitly
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// managing destroyed.
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if (this._readableState && this._writableState) {
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this._readableState.destroyed = value
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this._writableState.destroyed = value
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}
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}
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}
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})
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let webStreamsAdapters // Lazy to avoid circular references
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function lazyWebStreams() {
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if (webStreamsAdapters === undefined) webStreamsAdapters = {}
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return webStreamsAdapters
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}
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Duplex.fromWeb = function (pair, options) {
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return lazyWebStreams().newStreamDuplexFromReadableWritablePair(pair, options)
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}
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Duplex.toWeb = function (duplex) {
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return lazyWebStreams().newReadableWritablePairFromDuplex(duplex)
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}
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let duplexify
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Duplex.from = function (body) {
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if (!duplexify) {
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duplexify = require('./duplexify')
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}
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return duplexify(body, 'body')
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}
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