80b0dcfd2bAdd a utility for adding simple, streams-API based duplex pairs. PR-URL: https://github.com/nodejs/node/pull/16269 Reviewed-By: Anatoli Papirovski <apapirovski@mac.com> Reviewed-By: James M Snell <jasnell@gmail.com>
45 lines
1 KiB
JavaScript
45 lines
1 KiB
JavaScript
/* eslint-disable required-modules */
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'use strict';
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const { Duplex } = require('stream');
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const assert = require('assert');
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const kCallback = Symbol('Callback');
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const kOtherSide = Symbol('Other');
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class DuplexSocket extends Duplex {
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constructor() {
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super();
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this[kCallback] = null;
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this[kOtherSide] = null;
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}
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_read() {
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const callback = this[kCallback];
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if (callback) {
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this[kCallback] = null;
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callback();
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}
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}
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_write(chunk, encoding, callback) {
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assert.notStrictEqual(this[kOtherSide], null);
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assert.strictEqual(this[kOtherSide][kCallback], null);
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this[kOtherSide][kCallback] = callback;
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this[kOtherSide].push(chunk);
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}
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_final(callback) {
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this[kOtherSide].on('end', callback);
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this[kOtherSide].push(null);
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}
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}
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function makeDuplexPair() {
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const clientSide = new DuplexSocket();
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const serverSide = new DuplexSocket();
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clientSide[kOtherSide] = serverSide;
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serverSide[kOtherSide] = clientSide;
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return { clientSide, serverSide };
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}
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module.exports = makeDuplexPair;
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