144 lines
3.8 KiB
JavaScript
144 lines
3.8 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 prototypal inheritance, this class
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// prototypally 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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ObjectKeys,
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ObjectSetPrototypeOf,
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} = primordials;
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module.exports = Duplex;
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const Readable = require('_stream_readable');
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const Writable = require('_stream_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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// Allow the keys array to be GC'ed.
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for (const method of ObjectKeys(Writable.prototype)) {
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if (!Duplex.prototype[method])
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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))
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return new Duplex(options);
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Readable.call(this, options);
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Writable.call(this, options);
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this.allowHalfOpen = true;
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if (options) {
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if (options.readable === false)
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this.readable = false;
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if (options.writable === false)
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this.writable = false;
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if (options.allowHalfOpen === false) {
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this.allowHalfOpen = false;
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this.once('end', onend);
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}
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}
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}
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ObjectDefineProperties(Duplex.prototype, {
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destroyed: {
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get() {
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if (this._readableState === undefined ||
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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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writableHighWaterMark: {
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get() {
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return this._writableState && this._writableState.highWaterMark;
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}
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},
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writableBuffer: {
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get() {
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return this._writableState && this._writableState.getBuffer();
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}
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},
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writableLength: {
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get() {
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return this._writableState && this._writableState.length;
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}
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},
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writableFinished: {
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get() {
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return this._writableState ? this._writableState.finished : false;
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}
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},
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writableCorked: {
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get() {
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return this._writableState ? this._writableState.corked : 0;
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}
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},
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writableEnded: {
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get() {
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return this._writableState ? this._writableState.ending : false;
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}
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}
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});
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// The no-half-open enforcer
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function onend() {
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// If the writable side ended, then we're ok.
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if (this._writableState.ended)
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return;
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// No more data can be written.
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// But allow more writes to happen in this tick.
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process.nextTick(onEndNT, this);
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}
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function onEndNT(self) {
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self.end();
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}
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