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53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
// 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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module.exports = Duplex;
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var util = require('util');
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var Readable = require('_stream_readable');
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var Writable = require('_stream_writable');
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util.inherits(Duplex, Readable);
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var keys = Object.keys(Writable.prototype);
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for (var v = 0; v < keys.length; v++) {
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var method = keys[v];
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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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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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if (options && options.readable === false)
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this.readable = false;
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if (options && options.writable === false)
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this.writable = false;
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this.allowHalfOpen = true;
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if (options && 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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// the no-half-open enforcer
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function onend() {
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// if we allow half-open state, or if the writable side ended,
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// then we're ok.
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if (this.allowHalfOpen || 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(this.end.bind(this));
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}
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