test/parallel/test-net-keepalive.js

// Copyright Joyent, Inc. and other Node contributors.
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');
const assert = require('assert');
const net = require('net');

let serverConnection;
let clientConnection;
const echoServer = net.createServer(function(connection) {
  serverConnection = connection;
  setTimeout(common.mustCall(function() {
    // Make sure both connections are still open
    assert.strictEqual(serverConnection.readyState, 'open');
    assert.strictEqual(clientConnection.readyState, 'open');
    serverConnection.end();
    clientConnection.end();
    echoServer.close();
  }, 1), common.platformTimeout(100));
  connection.setTimeout(0);
  assert.notStrictEqual(connection.setKeepAlive, undefined);
  // Send a keepalive packet after 50 ms
  connection.setKeepAlive(true, common.platformTimeout(50));
  connection.on('end', function() {
    connection.end();
  });
});
echoServer.listen(0);

echoServer.on('listening', function() {
  clientConnection = net.createConnection(this.address().port);
  clientConnection.setTimeout(0);
});