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// 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 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);
this.allowHalfOpen = true;
if (options) {
if (options.readable === false)
this.readable = false;
if (options.writable === false)
this.writable = false;
if (options.allowHalfOpen === false) {
this.allowHalfOpen = false;
}
}
}
ObjectDefineProperties(Duplex.prototype, {
writable:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writable') },
writableHighWaterMark:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableHighWaterMark') },
writableObjectMode:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableObjectMode') },
writableBuffer:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableBuffer') },
writableLength:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableLength') },
writableFinished:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableFinished') },
writableCorked:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableCorked') },
writableEnded:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableEnded') },
writableNeedDrain:
{ __proto__: null, ...ObjectGetOwnPropertyDescriptor(Writable.prototype, 'writableNeedDrain') },
destroyed: {
__proto__: null,
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 duplexify;
Duplex.from = function(body) {
if (!duplexify) {
duplexify = require('internal/streams/duplexify');
}
return duplexify(body, 'body');
};
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