src/jingle/glue/channel_socket_adapter.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "jingle/glue/channel_socket_adapter.h"
   6
   7 #include <limits>
   8
   9 #include "base/callback.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "net/base/io_buffer.h"
  13 #include "net/base/net_errors.h"
  14 #include "third_party/libjingle/source/talk/p2p/base/transportchannel.h"
  15
  16 namespace jingle_glue {
  17
  18 TransportChannelSocketAdapter::TransportChannelSocketAdapter(
  19     cricket::TransportChannel* channel)
  20     : message_loop_(base::MessageLoop::current()),
  21       channel_(channel),
  22       closed_error_code_(net::OK) {
  23   DCHECK(channel_);
  24
  25   channel_->SignalReadPacket.connect(
  26       this, &TransportChannelSocketAdapter::OnNewPacket);
  27   channel_->SignalWritableState.connect(
  28       this, &TransportChannelSocketAdapter::OnWritableState);
  29   channel_->SignalDestroyed.connect(
  30       this, &TransportChannelSocketAdapter::OnChannelDestroyed);
  31 }
  32
  33 TransportChannelSocketAdapter::~TransportChannelSocketAdapter() {
  34   if (!destruction_callback_.is_null())
  35     destruction_callback_.Run();
  36 }
  37
  38 void TransportChannelSocketAdapter::SetOnDestroyedCallback(
  39     const base::Closure& callback) {
  40   destruction_callback_ = callback;
  41 }
  42
  43 int TransportChannelSocketAdapter::Read(
  44     net::IOBuffer* buf,
  45     int buffer_size,
  46     const net::CompletionCallback& callback) {
  47   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
  48   DCHECK(buf);
  49   DCHECK(!callback.is_null());
  50   CHECK(read_callback_.is_null());
  51
  52   if (!channel_) {
  53     DCHECK(closed_error_code_ != net::OK);
  54     return closed_error_code_;
  55   }
  56
  57   read_callback_ = callback;
  58   read_buffer_ = buf;
  59   read_buffer_size_ = buffer_size;
  60
  61   return net::ERR_IO_PENDING;
  62 }
  63
  64 int TransportChannelSocketAdapter::Write(
  65     net::IOBuffer* buffer,
  66     int buffer_size,
  67     const net::CompletionCallback& callback) {
  68   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
  69   DCHECK(buffer);
  70   DCHECK(!callback.is_null());
  71   CHECK(write_callback_.is_null());
  72
  73   if (!channel_) {
  74     DCHECK(closed_error_code_ != net::OK);
  75     return closed_error_code_;
  76   }
  77
  78   int result;
  79   talk_base::PacketOptions options;
  80   if (channel_->writable()) {
  81     result = channel_->SendPacket(buffer->data(), buffer_size, options);
  82     if (result < 0) {
  83       result = net::MapSystemError(channel_->GetError());
  84
  85       // If the underlying socket returns IO pending where it shouldn't we
  86       // pretend the packet is dropped and return as succeeded because no
  87       // writeable callback will happen.
  88       if (result == net::ERR_IO_PENDING)
  89         result = net::OK;
  90     }
  91   } else {
  92     // Channel is not writable yet.
  93     result = net::ERR_IO_PENDING;
  94     write_callback_ = callback;
  95     write_buffer_ = buffer;
  96     write_buffer_size_ = buffer_size;
  97   }
  98
  99   return result;
 100 }
 101
 102 int TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
 103   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 104   return (channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0) ?
 105       net::OK : net::ERR_SOCKET_SET_RECEIVE_BUFFER_SIZE_ERROR;
 106 }
 107
 108 int TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
 109   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 110   return (channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0) ?
 111       net::OK : net::ERR_SOCKET_SET_SEND_BUFFER_SIZE_ERROR;
 112 }
 113
 114 void TransportChannelSocketAdapter::Close(int error_code) {
 115   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 116
 117   if (!channel_)  // Already closed.
 118     return;
 119
 120   DCHECK(error_code != net::OK);
 121   closed_error_code_ = error_code;
 122   channel_->SignalReadPacket.disconnect(this);
 123   channel_->SignalDestroyed.disconnect(this);
 124   channel_ = NULL;
 125
 126   if (!read_callback_.is_null()) {
 127     net::CompletionCallback callback = read_callback_;
 128     read_callback_.Reset();
 129     read_buffer_ = NULL;
 130     callback.Run(error_code);
 131   }
 132
 133   if (!write_callback_.is_null()) {
 134     net::CompletionCallback callback = write_callback_;
 135     write_callback_.Reset();
 136     write_buffer_ = NULL;
 137     callback.Run(error_code);
 138   }
 139 }
 140
 141 void TransportChannelSocketAdapter::OnNewPacket(
 142     cricket::TransportChannel* channel,
 143     const char* data,
 144     size_t data_size,
 145     const talk_base::PacketTime& packet_time,
 146     int flags) {
 147   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 148   DCHECK_EQ(channel, channel_);
 149   if (!read_callback_.is_null()) {
 150     DCHECK(read_buffer_.get());
 151     CHECK_LT(data_size, static_cast<size_t>(std::numeric_limits<int>::max()));
 152
 153     if (read_buffer_size_ < static_cast<int>(data_size)) {
 154       LOG(WARNING) << "Data buffer is smaller than the received packet. "
 155                    << "Dropping the data that doesn't fit.";
 156       data_size = read_buffer_size_;
 157     }
 158
 159     memcpy(read_buffer_->data(), data, data_size);
 160
 161     net::CompletionCallback callback = read_callback_;
 162     read_callback_.Reset();
 163     read_buffer_ = NULL;
 164
 165     callback.Run(data_size);
 166   } else {
 167     LOG(WARNING)
 168         << "Data was received without a callback. Dropping the packet.";
 169   }
 170 }
 171
 172 void TransportChannelSocketAdapter::OnWritableState(
 173     cricket::TransportChannel* channel) {
 174   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 175   // Try to send the packet if there is a pending write.
 176   if (!write_callback_.is_null()) {
 177     talk_base::PacketOptions options;
 178     int result = channel_->SendPacket(write_buffer_->data(),
 179                                       write_buffer_size_,
 180                                       options);
 181     if (result < 0)
 182       result = net::MapSystemError(channel_->GetError());
 183
 184     if (result != net::ERR_IO_PENDING) {
 185       net::CompletionCallback callback = write_callback_;
 186       write_callback_.Reset();
 187       write_buffer_ = NULL;
 188       callback.Run(result);
 189     }
 190   }
 191 }
 192
 193 void TransportChannelSocketAdapter::OnChannelDestroyed(
 194     cricket::TransportChannel* channel) {
 195   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 196   DCHECK_EQ(channel, channel_);
 197   Close(net::ERR_CONNECTION_ABORTED);
 198 }
 199
 200 }  // namespace jingle_glue