Adding OrtcFactory, and changing UdpTransport to match current plan.

webrtc/p2p/base/udptransportchannel.cc

 /*
  *  Copyright 2016 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/p2p/base/udptransportchannel.h"
 
 #include <string>
 
 #include "webrtc/base/asyncudpsocket.h"
 #include "webrtc/base/asyncpacketsocket.h"
 #include "webrtc/base/logging.h"
-#include "webrtc/base/physicalsocketserver.h"
 #include "webrtc/base/socketaddress.h"
 #include "webrtc/base/thread.h"
 #include "webrtc/base/thread_checker.h"
-#include "webrtc/p2p/base/basicpacketsocketfactory.h"
-#include "webrtc/p2p/base/packettransportinterface.h"
 
 namespace cricket {
 
-UdpTransportChannel::UdpTransportChannel(const std::string& transport_name)
-    : UdpTransportChannel(transport_name,
-                          rtc::Thread::Current()->socketserver()) {}
+UdpTransport::UdpTransport(const std::string& transport_name,
+                           std::unique_ptr<rtc::AsyncPacketSocket> socket)
+    : transport_name_(transport_name), socket_(std::move(socket)) {
+  RTC_DCHECK(socket_);
+  socket_->SignalReadPacket.connect(this, &UdpTransport::OnSocketReadPacket);
+  socket_->SignalSentPacket.connect(this, &UdpTransport::OnSocketSentPacket);
+}
 
-UdpTransportChannel::UdpTransportChannel(const std::string& transport_name,
-                                         rtc::SocketServer* socket_server)
-    : transport_name_(transport_name), socket_server_(socket_server) {}
-
-UdpTransportChannel::~UdpTransportChannel() {
+UdpTransport::~UdpTransport() {
   RTC_DCHECK_RUN_ON(&network_thread_checker_);
 }
 
-void UdpTransportChannel::OnSocketReadPacket(
-    rtc::AsyncPacketSocket* socket,
-    const char* data,
-    size_t len,
-    const rtc::SocketAddress& remote_addr,
-    const rtc::PacketTime& packet_time) {
-  // No thread_checker in high frequency network function.
-  SignalReadPacket(this, data, len, packet_time, 0);
+rtc::SocketAddress UdpTransport::GetLocalAddress() const {
+  RTC_DCHECK_RUN_ON(&network_thread_checker_);
+  return socket_->GetLocalAddress();
 }
 
-void UdpTransportChannel::OnSocketSentPacket(rtc::AsyncPacketSocket* socket,
-                                             const rtc::SentPacket& packet) {
-  RTC_DCHECK_EQ(socket_.get(), socket);
-  SignalSentPacket(this, packet);
+bool UdpTransport::SetRemoteAddress(const rtc::SocketAddress& addr) {
+  RTC_DCHECK_RUN_ON(&network_thread_checker_);
+  if (!addr.IsComplete()) {
+    LOG(LS_WARNING) << "RemoteAddress address not complete.";
+    return false;
+  }
+  // TODO(johan): check for ipv4, other settings.
+  bool prev_destination_nil = remote_address_.IsNil();
+  remote_address_ = addr;
+  // Going from "didn't have destination" to "have destination" or vice versa.
+  if (prev_destination_nil != remote_address_.IsNil()) {
+    SignalWritableState(this);
+    if (prev_destination_nil) {
+      SignalReadyToSend(this);
+    }
+  }
+  return true;
 }
 
-bool UdpTransportChannel::writable() const {
-  return state_ == State::CONNECTED;
+rtc::SocketAddress UdpTransport::GetRemoteAddress() const {
+  RTC_DCHECK_RUN_ON(&network_thread_checker_);
+  return remote_address_;
 }
 
-int UdpTransportChannel::SendPacket(const char* data,
-                                    size_t len,
-                                    const rtc::PacketOptions& options,
-                                    int flags) {
+bool UdpTransport::writable() const {
+  RTC_DCHECK_RUN_ON(&network_thread_checker_);
+  return !remote_address_.IsNil();
+}
+
+int UdpTransport::SendPacket(const char* data,
+                             size_t len,
+                             const rtc::PacketOptions& options,
+                             int flags) {
   // No thread_checker in high frequency network function.
-  if (!remote_parameters_) {
-    LOG(LS_WARNING) << "Remote parameters not set.";
+  if (remote_address_.IsNil()) {
+    LOG(LS_WARNING) << "Remote address not set.";
     send_error_ = ENOTCONN;
     return -1;
   }
-  const rtc::SocketAddress& remote_addr_ = *remote_parameters_;
-  int result = socket_->SendTo((const void*)data, len, remote_addr_, options);
+  int result =
+      socket_->SendTo((const void*)data, len, remote_address_, options);
   if (result <= 0) {
     LOG(LS_VERBOSE) << "SendPacket() " << result;
   }
   return result;
 }
 
-void UdpTransportChannel::Start() {
-  RTC_DCHECK_RUN_ON(&network_thread_checker_);
-  if (socket_) {
-    LOG(LS_WARNING) << "Local socket already allocated.";
-    return;
-  }
-  static constexpr uint16_t kMaxTries = 100;
-  static constexpr uint16_t kMinPortNumber = 2000;
-  // TODO(johan) provide configuration option for kMinPortNumber.
-  rtc::SocketAddress socket_addr("0.0.0.0", 0);
-  // TODO(johan): Replace BasicPacketSocketFactory by something that honors RFC
-  // 3550 Section 11 port number requirements like
-  // {port_{RTP} is even, port_{RTCP} := port{RTP} + 1}.
-  rtc::BasicPacketSocketFactory socket_factory(socket_server_);
-  socket_.reset(socket_factory.CreateUdpSocket(socket_addr, kMinPortNumber,
-                                               kMinPortNumber + kMaxTries));
-  if (socket_) {
-    local_parameters_ =
-        rtc::Optional<rtc::SocketAddress>(socket_->GetLocalAddress());
-    LOG(INFO) << "Created UDP socket with addr " << local_parameters_->ipaddr()
-              << " port " << local_parameters_->port() << ".";
-    socket_->SignalReadPacket.connect(this,
-                                      &UdpTransportChannel::OnSocketReadPacket);
-    socket_->SignalSentPacket.connect(this,
-                                      &UdpTransportChannel::OnSocketSentPacket);
-  } else {
-    LOG(INFO) << "Local socket allocation failure";
-  }
-  UpdateState();
-  return;
+void UdpTransport::OnSocketReadPacket(rtc::AsyncPacketSocket* socket,
+                                      const char* data,
+                                      size_t len,
+                                      const rtc::SocketAddress& remote_addr,
+                                      const rtc::PacketTime& packet_time) {
+  // No thread_checker in high frequency network function.
+  SignalReadPacket(this, data, len, packet_time, 0);
 }
 
-void UdpTransportChannel::UpdateState() {
-  RTC_DCHECK_RUN_ON(&network_thread_checker_);
-  RTC_DCHECK(!(local_parameters_ && !socket_));
-  RTC_DCHECK(!(!local_parameters_ && socket_));
-  if (!local_parameters_) {
-    SetState(State::INIT);
-  } else if (!remote_parameters_) {
-    SetState(State::CONNECTING);
-  } else {
-    SetState(State::CONNECTED);
-  }
+void UdpTransport::OnSocketSentPacket(rtc::AsyncPacketSocket* socket,
+                                      const rtc::SentPacket& packet) {
+  RTC_DCHECK_EQ(socket_.get(), socket);
+  SignalSentPacket(this, packet);
 }
 
-void UdpTransportChannel::SetRemoteParameters(const rtc::SocketAddress& addr) {
-  RTC_DCHECK_RUN_ON(&network_thread_checker_);
-  if (!addr.IsComplete()) {
-    LOG(INFO) << "remote address not complete";
-    return;
-  }
-  // TODO(johan) check for ipv4, other settings.
-  remote_parameters_ = rtc::Optional<rtc::SocketAddress>(addr);
-  UpdateState();
-}
-
-void UdpTransportChannel::SetState(State state) {
-  RTC_DCHECK_RUN_ON(&network_thread_checker_);
-  if (state_ == state) {
-    return;
-  }
-  state_ = state;
-  if (state == State::CONNECTED) {
-    SignalWritableState(this);
-    SignalReadyToSend(this);
-  }
-}
 }  // namespace cricket