333

schangxiang@126.com

2025-09-19 18966e02fb573c7e2bb0c6426ed792b38b910940

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'use strict';
const Duplex = require('stream').Duplex;
 
const kCallback = Symbol('Callback');
const kOtherSide = Symbol('Other');
 
class DuplexSocket extends Duplex {
  constructor(options) {
    super(options);
    this[kCallback] = null;
    this[kOtherSide] = null;
  }
 
  _read() {
    const callback = this[kCallback];
    if (callback) {
      this[kCallback] = null;
      callback();
    }
  }
 
  _write(chunk, encoding, callback) {
    this[kOtherSide][kCallback] = callback;
    this[kOtherSide].push(chunk);
  }
 
  _final(callback) {
    this[kOtherSide].on('end', callback);
    this[kOtherSide].push(null);
  }
}
 
class DuplexPair {
  constructor(options) {
    this.socket1 = new DuplexSocket(options);
    this.socket2 = new DuplexSocket(options);
    this.socket1[kOtherSide] = this.socket2;
    this.socket2[kOtherSide] = this.socket1;
  }
}
 
module.exports = DuplexPair;