node/test/pummel/test-net-pingpong.js

common = require("../common");
assert = common.assert
net = require("net");

var tests_run = 0;

function pingPongTest (port, host, on_complete) {
  var N = 1000;
  var count = 0;
  var sent_final_ping = false;

  var server = net.createServer({ allowHalfOpen: true }, function (socket) {
    assert.equal(true, socket.remoteAddress !== null);
    assert.equal(true, socket.remoteAddress !== undefined);
    if (host === "127.0.0.1" || host === "localhost" || !host) {
      assert.equal(socket.remoteAddress, "127.0.0.1");
    } else {
      console.log('host = ' + host + ', remoteAddress = ' + socket.remoteAddress);
      assert.equal(socket.remoteAddress, "::1");
    }

    socket.setEncoding("utf8");
    socket.setNoDelay();
    socket.timeout = 0;

    socket.addListener("data", function (data) {
      console.log("server got: " + JSON.stringify(data));
      assert.equal("open", socket.readyState);
      assert.equal(true, count <= N);
      if (/PING/.exec(data)) {
        socket.write("PONG");
      }
    });

    socket.addListener("end", function () {
      assert.equal("writeOnly", socket.readyState);
      socket.end();
    });

    socket.addListener("close", function (had_error) {
      assert.equal(false, had_error);
      assert.equal("closed", socket.readyState);
      socket.server.close();
    });
  });

  server.listen(port, host, function () {
    var client = net.createConnection(port, host);

    client.setEncoding("utf8");

    client.addListener("connect", function () {
      assert.equal("open", client.readyState);
      client.write("PING");
    });

    client.addListener("data", function (data) {
      console.log('client got: ' + data);

      assert.equal("PONG", data);
      count += 1;

      if (sent_final_ping) {
        assert.equal("readOnly", client.readyState);
        return;
      } else {
        assert.equal("open", client.readyState);
      }

      if (count < N) {
        client.write("PING");
      } else {
        sent_final_ping = true;
        client.write("PING");
        client.end();
      }
    });

    client.addListener("close", function () {
      assert.equal(N+1, count);
      assert.equal(true, sent_final_ping);
      if (on_complete) on_complete();
      tests_run += 1;
    });
  });
}

/* All are run at once, so run on different ports */
pingPongTest(common.PORT, "localhost");
pingPongTest(common.PORT+1, null);

// This IPv6 isn't working on Solaris
var solaris = /sunos/i.test(process.platform);
if (!solaris) pingPongTest(common.PORT+2, "::1");

process.addListener("exit", function () {
  assert.equal(solaris ? 2 : 3, tests_run);
});