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'use strict';
const { Duplex } = require('stream');
const kCallback = Symbol('Callback');
const kOtherSide = Symbol('Other');
class DuplexSocket extends Duplex {
constructor() {
super();
this[kCallback] = null;
this[kOtherSide] = null;
}
_read() {
const callback = this[kCallback];
if (callback) {
this[kCallback] = null;
callback();
}
}
_write(chunk, encoding, callback) {
if (chunk.length === 0) {
process.nextTick(callback);
} else {
this[kOtherSide].push(chunk);
this[kOtherSide][kCallback] = callback;
}
}
_final(callback) {
this[kOtherSide].on('end', callback);
this[kOtherSide].push(null);
}
}
class DuplexPair {
constructor() {
this.socket1 = new DuplexSocket();
this.socket2 = new DuplexSocket();
this.socket1[kOtherSide] = this.socket2;
this.socket2[kOtherSide] = this.socket1;
}
}
module.exports = DuplexPair;