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PR-URL: #34111 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,62 @@ | ||
'use strict'; | ||
const { | ||
Symbol, | ||
} = primordials; | ||
|
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const { Duplex } = require('stream'); | ||
const assert = require('internal/assert'); | ||
|
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const kCallback = Symbol('Callback'); | ||
const kInitOtherSide = Symbol('InitOtherSide'); | ||
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class DuplexSide extends Duplex { | ||
#otherSide = null; | ||
|
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constructor(options) { | ||
super(options); | ||
this[kCallback] = null; | ||
this.#otherSide = null; | ||
} | ||
|
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[kInitOtherSide](otherSide) { | ||
// Ensure this can only be set once, to enforce encapsulation. | ||
if (this.#otherSide === null) { | ||
this.#otherSide = otherSide; | ||
} else { | ||
assert(this.#otherSide === null); | ||
} | ||
} | ||
|
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_read() { | ||
const callback = this[kCallback]; | ||
if (callback) { | ||
this[kCallback] = null; | ||
callback(); | ||
} | ||
} | ||
|
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_write(chunk, encoding, callback) { | ||
assert(this.#otherSide !== null); | ||
assert(this.#otherSide[kCallback] === null); | ||
if (chunk.length === 0) { | ||
process.nextTick(callback); | ||
} else { | ||
this.#otherSide.push(chunk); | ||
this.#otherSide[kCallback] = callback; | ||
} | ||
} | ||
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_final(callback) { | ||
this.#otherSide.on('end', callback); | ||
this.#otherSide.push(null); | ||
} | ||
} | ||
|
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function duplexPair(options) { | ||
const side0 = new DuplexSide(options); | ||
const side1 = new DuplexSide(options); | ||
side0[kInitOtherSide](side1); | ||
side1[kInitOtherSide](side0); | ||
return [ side0, side1 ]; | ||
} | ||
module.exports = duplexPair; |
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