Extract meta data about open sockets into separate class.

runtime/observatory/tests/service/tcp_socket_service_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io' as io;
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+
+Future setupTCP() async {
+  // Note that we don't close after us, by design we leave the sockets opens
+  // to allow us to query them from the other isolate.
+  var serverSocket = await io.ServerSocket.bind('127.0.0.1', 0);
+  serverSocket.listen((s) {
+    s.transform(UTF8.decoder).listen(print);
+    s.close();
+  });
+  var socket = await io.Socket.connect("127.0.0.1", serverSocket.port);
+  socket.write("foobar");
+  socket.write("foobar");
+  await socket.flush();
+
+  var socket2 = await io.Socket.connect("127.0.0.1", serverSocket.port);
+  socket2.write("foobarfoobar");
+  await socket2.flush();
+}
+
+var tcpTests = [
+  // Initial.
+  (Isolate isolate) async {
+    var result = await isolate.invokeRpcNoUpgrade('__getOpenSockets', {});
+    expect(result['type'], equals('_opensockets'));
+    // We expect 3 sockets to be open (in this order):
+    //   The server socket accepting connections, on port X
+    //   The accepted connection on the client, on port Y
+    //   The client connection, on port X
+    expect(result['data'].length, equals(5));
+    // The first socket will have a name like listening:127.0.0.1:X
+    // The second will have a name like 127.0.0.1:Y
+    // The third will have a name like 127.0.0.1:X
+    expect(result['data'][0]['name'].startsWith('listening:127.0.0.1'), isTrue);
+    expect(result['data'][1]['name'].startsWith('127.0.0.1:'), isTrue);
+    expect(result['data'][2]['name'].startsWith('127.0.0.1:'), isTrue);
+
+    var listening = await isolate.invokeRpcNoUpgrade(
+        '__getSocketByID', { 'id' : result['data'][0]['id'] });
+    expect(listening['id'], equals(result['data'][0]['id']));
+    expect(listening['listening'], isTrue);
+    expect(listening['socket_type'], equals('TCP'));
+    expect(listening['port'], greaterThanOrEqualTo(1024));
+    expect(listening['last_read'], greaterThan(0));
+    expect(listening['total_read'], equals(2));
+    expect(listening['last_write'], equals(0));
+    expect(listening['total_written'], equals(0));
+    expect(listening['write_count'], equals(0));
+    expect(listening['read_count'], equals(0));
+    expect(listening['remote_host'], equals('NA'));
+    expect(listening['remote_port'], equals('NA'));
+
+    var client = await isolate.invokeRpcNoUpgrade(
+        '__getSocketByID', { 'id' : result['data'][1]['id'] });
+    expect(client['id'], equals(result['data'][1]['id']));
+
+    var server = await isolate.invokeRpcNoUpgrade(
+        '__getSocketByID', { 'id' : result['data'][2]['id'] });
+    expect(server['id'], equals(result['data'][2]['id']));
+
+    // We expect the client to be connected on the port and
+    // host of the listening socket.
+    expect(client['remote_port'], equals(listening['port']));
+    expect(client['remote_host'], equals(listening['host']));
+    // We expect the third socket (accepted server) to be connected to the
+    // same port and host as the listening socket (the listening one).
+    expect(server['port'], equals(listening['port']));
+    expect(server['host'], equals(listening['host']));
+
+    expect(client['listening'], isFalse);
+    expect(server['listening'], isFalse);
+
+    expect(client['socket_type'], equals('TCP'));
+    expect(server['socket_type'], equals('TCP'));
+
+    // We are using no reserved ports.
+    expect(client['port'], greaterThanOrEqualTo(1024));
+    expect(server['port'], greaterThanOrEqualTo(1024));
+
+    // The client and server "mirror" each other in reads and writes, and the
+    // timestamps are in correct order.
+    expect(client['last_read'], equals(0));
+    expect(server['last_read'], greaterThan(0));
+    expect(client['total_read'], equals(0));
+    expect(server['total_read'], equals(12));
+    expect(client['read_count'], equals(0));
+    // We did not flush after first write, so only one read.
+    // This may be fragile -> should we just make sure it is bigger than 1?
+    expect(server['read_count'], equals(1));
+
+    expect(client['last_write'], greaterThan(0));
+    expect(server['last_write'], equals(0));
+    expect(client['total_written'], equals(12));
+    expect(server['total_written'], equals(0));
+    expect(client['write_count'], equals(2));
+    expect(server['write_count'], equals(0));
+
+    // Order
+    expect(server['last_read'], greaterThan(client['last_write']));
+
+    var second_client = await isolate.invokeRpcNoUpgrade(
+        '__getSocketByID', { 'id' : result['data'][3]['id'] });
+    expect(second_client['id'], equals(result['data'][3]['id']));
+    var second_server = await isolate.invokeRpcNoUpgrade(
+        '__getSocketByID', { 'id' : result['data'][4]['id'] });
+    expect(second_server['id'], equals(result['data'][4]['id']));
+
+    // We expect the client to be connected on the port and
+    // host of the listening socket.
+    expect(second_client['remote_port'], equals(listening['port']));
+    expect(second_client['remote_host'], equals(listening['host']));
+    // We expect the third socket (accepted server) to be connected to the
+    // same port and host as the listening socket (the listening one).
+    expect(second_server['port'], equals(listening['port']));
+    expect(second_server['host'], equals(listening['host']));
+
+    expect(second_client['listening'], isFalse);
+    expect(second_server['listening'], isFalse);
+
+    expect(second_client['socket_type'], equals('TCP'));
+    expect(second_server['socket_type'], equals('TCP'));
+
+    // We are using no reserved ports.
+    expect(second_client['port'], greaterThanOrEqualTo(1024));
+    expect(second_server['port'], greaterThanOrEqualTo(1024));
+
+    // The client and server "mirror" each other in reads and writes, and the
+    // timestamps are in correct order.
+    expect(second_client['last_read'], equals(0));
+    expect(second_server['last_read'], greaterThan(0));
+    expect(second_client['total_read'], equals(0));
+    expect(second_server['total_read'], equals(12));
+    expect(second_client['read_count'], equals(0));
+    expect(second_server['read_count'], equals(1));
+
+    expect(second_client['last_write'], greaterThan(0));
+    expect(second_server['last_write'], equals(0));
+    expect(second_client['total_written'], equals(12));
+    expect(second_server['total_written'], equals(0));
+    expect(second_client['write_count'], equals(1));
+    expect(second_server['write_count'], equals(0));
+
+    // Order
+    expect(server['last_read'], greaterThan(client['last_write']));
+  },
+];
+
+main(args) async => runIsolateTests(args, tcpTests, testeeBefore:setupTCP);