Add first part of the network_tester functionality.

webrtc/tools/network_tester/test_controller.cc

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/tools/network_tester/test_controller.h"
+
+namespace webrtc {
+
+TestController::TestController(int min_port,
+                               int max_port,
+                               const std::string& config_file_path)
+    : config_file_path_(config_file_path),
+      local_test_done_(false),
+      remote_test_done_(false) {
+  auto socket =
+      std::unique_ptr<rtc::AsyncPacketSocket>(socket_factory_.CreateUdpSocket(
+          rtc::SocketAddress(rtc::GetAnyIP(AF_INET), 0), min_port, max_port));
+  socket->SignalReadPacket.connect(this, &TestController::OnReadPacket);
+  udp_transport_.reset(
+      new cricket::UdpTransport("signaling transport", std::move(socket)));
+}
+
+void TestController::SendConnectTo(const std::string& hostname, int port) {
+  udp_transport_->SetRemoteAddress(rtc::SocketAddress(hostname, port));
+  NetworkTesterPacket packet;
+  packet.set_type(NetworkTesterPacket::HAND_SHAKING);
+  SendData(packet, rtc::Optional<size_t>());
+  local_test_done_ = false;
+  remote_test_done_ = false;
+}
+
+void TestController::Run() {
+  rtc::Thread::Current()->ProcessMessages(0);
+}
+
+void TestController::OnReadPacket(rtc::AsyncPacketSocket* socket,
+                                  const char* data,
+                                  size_t len,
+                                  const rtc::SocketAddress& remote_addr,
+                                  const rtc::PacketTime& packet_time) {
+  size_t packet_size = data[0];
+  std::string receive_data(&data[1], packet_size);
+  NetworkTesterPacket packet;
+  packet.ParseFromString(receive_data);
+  RTC_CHECK(packet.has_type());
+  switch (packet.type()) {
+    case NetworkTesterPacket::HAND_SHAKING: {
+      local_test_done_ = false;
+      remote_test_done_ = false;
+      NetworkTesterPacket packet;
+      packet.set_type(NetworkTesterPacket::TEST_START);
+      udp_transport_->SetRemoteAddress(remote_addr);
+      SendData(packet, rtc::Optional<size_t>());
+      packet_sender_.reset(new PacketSender(this, config_file_path_));
+      packet_sender_->StartSending();
+      break;
+    }
+    case NetworkTesterPacket::TEST_START: {
+      packet_sender_.reset(new PacketSender(this, config_file_path_));
+      packet_sender_->StartSending();
+      break;
+    }
+    case NetworkTesterPacket::TEST_DATA: {
+      packet.set_arrival_timestamp(packet_time.timestamp);
+      packet.set_packet_size(len);
+      // log packet
+      break;
+    }
+    case NetworkTesterPacket::TEST_DONE: {
+      remote_test_done_ = true;
+      break;
+    }
+    default: { RTC_NOTREACHED(); }
+  }
+}
+
+void TestController::SendData(const NetworkTesterPacket& packet,
+                              rtc::Optional<size_t> data_size) {
+  size_t packet_size = packet.ByteSize();
+  send_data_[0] = packet_size;
+  packet.SerializeToArray(&send_data_[1], std::numeric_limits<char>::max());
+  if (data_size && *data_size > packet_size)
+    packet_size = *data_size;
+  udp_transport_->SendPacket(send_data_.data(), packet_size + 1,
+                             rtc::PacketOptions(), 0);
+}
+
+void TestController::OnTestDone() {
+  NetworkTesterPacket packet;
+  packet.set_type(NetworkTesterPacket::TEST_DONE);
+  SendData(packet, rtc::Optional<size_t>());
+  local_test_done_ = true;
+}
+
+}  // namespace webrtc