| // Copyright Joyent, Inc. and other Node contributors. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to permit |
| // persons to whom the Software is furnished to do so, subject to the |
| // following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN |
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| // USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| // a duplex stream is just a stream that is both readable and writable. |
| // Since JS doesn't have multiple prototypal inheritance, this class |
| // prototypally inherits from Readable, and then parasitically from |
| // Writable. |
| |
| 'use strict'; |
| |
| /*<replacement>*/ |
| |
| var pna = require('process-nextick-args'); |
| /*</replacement>*/ |
| |
| /*<replacement>*/ |
| var objectKeys = Object.keys || function (obj) { |
| var keys = []; |
| for (var key in obj) { |
| keys.push(key); |
| }return keys; |
| }; |
| /*</replacement>*/ |
| |
| module.exports = Duplex; |
| |
| /*<replacement>*/ |
| var util = require('core-util-is'); |
| util.inherits = require('inherits'); |
| /*</replacement>*/ |
| |
| var Readable = require('./_stream_readable'); |
| var Writable = require('./_stream_writable'); |
| |
| util.inherits(Duplex, Readable); |
| |
| { |
| // avoid scope creep, the keys array can then be collected |
| var keys = objectKeys(Writable.prototype); |
| for (var v = 0; v < keys.length; v++) { |
| var method = keys[v]; |
| if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]; |
| } |
| } |
| |
| function Duplex(options) { |
| if (!(this instanceof Duplex)) return new Duplex(options); |
| |
| Readable.call(this, options); |
| Writable.call(this, options); |
| |
| if (options && options.readable === false) this.readable = false; |
| |
| if (options && options.writable === false) this.writable = false; |
| |
| this.allowHalfOpen = true; |
| if (options && options.allowHalfOpen === false) this.allowHalfOpen = false; |
| |
| this.once('end', onend); |
| } |
| |
| Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', { |
| // making it explicit this property is not enumerable |
| // because otherwise some prototype manipulation in |
| // userland will fail |
| enumerable: false, |
| get: function () { |
| return this._writableState.highWaterMark; |
| } |
| }); |
| |
| // the no-half-open enforcer |
| function onend() { |
| // if we allow half-open state, or if the writable side ended, |
| // then we're ok. |
| if (this.allowHalfOpen || this._writableState.ended) return; |
| |
| // no more data can be written. |
| // But allow more writes to happen in this tick. |
| pna.nextTick(onEndNT, this); |
| } |
| |
| function onEndNT(self) { |
| self.end(); |
| } |
| |
| Object.defineProperty(Duplex.prototype, 'destroyed', { |
| get: function () { |
| if (this._readableState === undefined || this._writableState === undefined) { |
| return false; |
| } |
| return this._readableState.destroyed && this._writableState.destroyed; |
| }, |
| set: function (value) { |
| // we ignore the value if the stream |
| // has not been initialized yet |
| if (this._readableState === undefined || this._writableState === undefined) { |
| return; |
| } |
| |
| // backward compatibility, the user is explicitly |
| // managing destroyed |
| this._readableState.destroyed = value; |
| this._writableState.destroyed = value; |
| } |
| }); |
| |
| Duplex.prototype._destroy = function (err, cb) { |
| this.push(null); |
| this.end(); |
| |
| pna.nextTick(cb, err); |
| }; |