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     if (result < 0) {
  82       result = net::MapSystemError(channel_->GetError());
  83
  84       // If the underlying socket returns IO pending where it shouldn't we
  85       // pretend the packet is dropped and return as succeeded because no
  86       // writeable callback will happen.
  87       if (result == net::ERR_IO_PENDING)
  88         result = net::OK;
  89     }
  90   } else {
  91     // Channel is not writable yet.
  92     result = net::ERR_IO_PENDING;
  93     write_callback_ = callback;
  94     write_buffer_ = buffer;
  95     write_buffer_size_ = buffer_size;
  96   }
  97
  98   return result;
  99 }
 100
 101 bool TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
 102   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 103   return channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0;
 104 }
 105
 106 bool TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
 107   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 108   return channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0;
 109 }
 110
 111 void TransportChannelSocketAdapter::Close(int error_code) {
 112   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 113
 114   if (!channel_)  // Already closed.
 115     return;
 116
 117   DCHECK(error_code != net::OK);
 118   closed_error_code_ = error_code;
 119   channel_->SignalReadPacket.disconnect(this);
 120   channel_->SignalDestroyed.disconnect(this);
 121   channel_ = NULL;
 122
 123   if (!read_callback_.is_null()) {
 124     net::CompletionCallback callback = read_callback_;
 125     read_callback_.Reset();
 126     read_buffer_ = NULL;
 127     callback.Run(error_code);
 128   }
 129
 130   if (!write_callback_.is_null()) {
 131     net::CompletionCallback callback = write_callback_;
 132     write_callback_.Reset();
 133     write_buffer_ = NULL;
 134     callback.Run(error_code);
 135   }
 136 }
 137
 138 void TransportChannelSocketAdapter::OnNewPacket(
 139     cricket::TransportChannel* channel,
 140     const char* data,
 141     size_t data_size,
 142     int flags) {
 143   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 144   DCHECK_EQ(channel, channel_);
 145   if (!read_callback_.is_null()) {
 146     DCHECK(read_buffer_.get());
 147     CHECK_LT(data_size, static_cast<size_t>(std::numeric_limits<int>::max()));
 148
 149     if (read_buffer_size_ < static_cast<int>(data_size)) {
 150       LOG(WARNING) << "Data buffer is smaller than the received packet. "
 151                    << "Dropping the data that doesn't fit.";
 152       data_size = read_buffer_size_;
 153     }
 154
 155     memcpy(read_buffer_->data(), data, data_size);
 156
 157     net::CompletionCallback callback = read_callback_;
 158     read_callback_.Reset();
 159     read_buffer_ = NULL;
 160
 161     callback.Run(data_size);
 162   } else {
 163     LOG(WARNING)
 164         << "Data was received without a callback. Dropping the packet.";
 165   }
 166 }
 167
 168 void TransportChannelSocketAdapter::OnWritableState(
 169     cricket::TransportChannel* channel) {
 170   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 171   // Try to send the packet if there is a pending write.
 172   if (!write_callback_.is_null()) {
 173     int result = channel_->SendPacket(write_buffer_->data(),
 174                                       write_buffer_size_);
 175     if (result < 0)
 176       result = net::MapSystemError(channel_->GetError());
 177
 178     if (result != net::ERR_IO_PENDING) {
 179       net::CompletionCallback callback = write_callback_;
 180       write_callback_.Reset();
 181       write_buffer_ = NULL;
 182       callback.Run(result);
 183     }
 184   }
 185 }
 186
 187 void TransportChannelSocketAdapter::OnChannelDestroyed(
 188     cricket::TransportChannel* channel) {
 189   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
 190   DCHECK_EQ(channel, channel_);
 191   Close(net::ERR_CONNECTION_ABORTED);
 192 }
 193
 194 }  // namespace jingle_glue