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46 lines
1.2 KiB
46 lines
1.2 KiB
2 years ago
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import {inherits} from 'util';
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import {nextTick} from 'process';
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import {Readable} from './readable';
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import {Writable} from './writable';
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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]) Duplex.prototype[method] = Writable.prototype[method];
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}
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export default Duplex;
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export function Duplex(options) {
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if (!(this instanceof Duplex)) 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) this.readable = false;
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if (options && options.writable === false) this.writable = false;
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this.allowHalfOpen = true;
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if (options && options.allowHalfOpen === false) 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) 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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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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