Function pingPongTest

test/parallel/test-net-pingpong.js:27–126

(port, host)

const net = require('net');

function pingPongTest(port, host) {
  const N = 1000;
  let count = 0;
  let sentPongs = 0;
  let sent_final_ping = false;

  const server = net.createServer(
    { allowHalfOpen: true },
    common.mustCall(onSocket)
  );

  function onSocket(socket) {
    assert.strictEqual(socket.server, server);
    assert.strictEqual(
      server,
      server.getConnections(common.mustSucceed((connections) => {
        assert.strictEqual(connections, 1);
      }))
    );

    socket.setNoDelay();
    socket.timeout = 0;

    socket.setEncoding('utf8');
    socket.on('data', common.mustCall(function(data) {
      // Since we never queue data (we're always waiting for the PING
      // before sending a pong) the writeQueueSize should always be less
      // than one message.
      assert.ok(socket.bufferSize >= 0 && socket.bufferSize <= 4);

      assert.strictEqual(socket.writable, true);
      assert.strictEqual(socket.readable, true);
      assert.ok(count <= N);
      assert.strictEqual(data, 'PING');

      socket.write('PONG', common.mustCall(function() {
        sentPongs++;
      }));
    }, N + 1));

    socket.on('end', common.mustCall(function() {
      assert.strictEqual(socket.allowHalfOpen, true);
      assert.strictEqual(socket.writable, true); // Because allowHalfOpen
      assert.strictEqual(socket.readable, false);
      socket.end();
    }));

    socket.on('error', common.mustNotCall());

    socket.on('close', common.mustCall(function() {
      assert.strictEqual(socket.writable, false);
      assert.strictEqual(socket.readable, false);
      socket.server.close();
    }));
  }


  server.listen(port, host, common.mustCall(function() {