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   if (channel_->writable()) {
  80     result = channel_->SendPacket(buffer->data(), buffer_size,
  81                                   talk_base::DSCP_NO_CHANGE);
  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 bool TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
 103   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 104   return channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0;
 105 }
 106
 107 bool TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
 108   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 109   return channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0;
 110 }
 111
 112 void TransportChannelSocketAdapter::Close(int error_code) {
 113   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 114
 115   if (!channel_)  // Already closed.
 116     return;
 117
 118   DCHECK(error_code != net::OK);
 119   closed_error_code_ = error_code;
 120   channel_->SignalReadPacket.disconnect(this);
 121   channel_->SignalDestroyed.disconnect(this);
 122   channel_ = NULL;
 123
 124   if (!read_callback_.is_null()) {
 125     net::CompletionCallback callback = read_callback_;
 126     read_callback_.Reset();
 127     read_buffer_ = NULL;
 128     callback.Run(error_code);
 129   }
 130
 131   if (!write_callback_.is_null()) {
 132     net::CompletionCallback callback = write_callback_;
 133     write_callback_.Reset();
 134     write_buffer_ = NULL;
 135     callback.Run(error_code);
 136   }
 137 }
 138
 139 void TransportChannelSocketAdapter::OnNewPacket(
 140     cricket::TransportChannel* channel,
 141     const char* data,
 142     size_t data_size,
 143     int flags) {
 144   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 145   DCHECK_EQ(channel, channel_);
 146   if (!read_callback_.is_null()) {
 147     DCHECK(read_buffer_.get());
 148     CHECK_LT(data_size, static_cast<size_t>(std::numeric_limits<int>::max()));
 149
 150     if (read_buffer_size_ < static_cast<int>(data_size)) {
 151       LOG(WARNING) << "Data buffer is smaller than the received packet. "
 152                    << "Dropping the data that doesn't fit.";
 153       data_size = read_buffer_size_;
 154     }
 155
 156     memcpy(read_buffer_->data(), data, data_size);
 157
 158     net::CompletionCallback callback = read_callback_;
 159     read_callback_.Reset();
 160     read_buffer_ = NULL;
 161
 162     callback.Run(data_size);
 163   } else {
 164     LOG(WARNING)
 165         << "Data was received without a callback. Dropping the packet.";
 166   }
 167 }
 168
 169 void TransportChannelSocketAdapter::OnWritableState(
 170     cricket::TransportChannel* channel) {
 171   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 172   // Try to send the packet if there is a pending write.
 173   if (!write_callback_.is_null()) {
 174     int result = channel_->SendPacket(write_buffer_->data(),
 175                                       write_buffer_size_,
 176                                       talk_base::DSCP_NO_CHANGE);
 177     if (result < 0)
 178       result = net::MapSystemError(channel_->GetError());
 179
 180     if (result != net::ERR_IO_PENDING) {
 181       net::CompletionCallback callback = write_callback_;
 182       write_callback_.Reset();
 183       write_buffer_ = NULL;
 184       callback.Run(result);
 185     }
 186   }
 187 }
 188
 189 void TransportChannelSocketAdapter::OnChannelDestroyed(
 190     cricket::TransportChannel* channel) {
 191   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 192   DCHECK_EQ(channel, channel_);
 193   Close(net::ERR_CONNECTION_ABORTED);
 194 }
 195
 196 }  // namespace jingle_glue