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//
// 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 prototype inheritance, this class
// prototypically inherits from Readable, and then parasitically from
// Writable.
'use strict';
const {
ObjectDefineProperties,
ObjectGetOwnPropertyDescriptor,
ObjectKeys,
ObjectSetPrototypeOf,
} = primordials;
module.exports = Duplex;
const Readable = require('internal/streams/readable');
const Writable = require('internal/streams/writable');
ObjectSetPrototypeOf(Duplex.prototype, Readable.prototype);
ObjectSetPrototypeOf(Duplex, Readable);
{
const keys = ObjectKeys(Writable.prototype);
// Allow the keys array to be GC'ed.
for (let i = 0; i < keys.length; i++) {
const method = keys[i];
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) {
this.allowHalfOpen = options.allowHalfOpen !== false;
if (options.readable === false) {
this._readableState.readable = false;
this._readableState.ended = true;
this._readableState.endEmitted = true;
}
if (options.writable === false) {
this._writableState.writable = false;
this._writableState.ending = true;
this._writableState.ended = true;
this._writableState.finished = true;
}
} else {
this.allowHalfOpen = true;
}
}
ObjectDefineProperties(Duplex.prototype, {
writable:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writable'),
writableHighWaterMark:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableHighWaterMark'),
writableObjectMode:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableObjectMode'),
writableBuffer:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableBuffer'),
writableLength:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableLength'),
writableFinished:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableFinished'),
writableCorked:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableCorked'),
writableEnded:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableEnded'),
writableNeedDrain:
ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableNeedDrain'),
destroyed: {
get() {
if (this._readableState === undefined ||
this._writableState === undefined) {
return false;
}
return this._readableState.destroyed && this._writableState.destroyed;
},
set(value) {
// Backward compatibility, the user is explicitly
// managing destroyed.
if (this._readableState && this._writableState) {
this._readableState.destroyed = value;
this._writableState.destroyed = value;
}
}
}
});
let webStreamsAdapters;
// Lazy to avoid circular references
function lazyWebStreams() {
if (webStreamsAdapters === undefined)
webStreamsAdapters = require('internal/webstreams/adapters');
return webStreamsAdapters;
}
Duplex.fromWeb = function(pair, options) {
return lazyWebStreams().newStreamDuplexFromReadableWritablePair(
pair,
options);
};
Duplex.toWeb = function(duplex) {
return lazyWebStreams().newReadableWritablePairFromDuplex(duplex);
};
let duplexify;
Duplex.from = function(body) {
if (!duplexify) {
duplexify = require('internal/streams/duplexify');
}
return duplexify(body, 'body');
};
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