src/mojo/services/network/tcp_connected_socket_impl.cc

   1 // Copyright 2014 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 "mojo/services/network/tcp_connected_socket_impl.h"
   6
   7 #include "base/message_loop/message_loop.h"
   8 #include "mojo/services/network/net_adapters.h"
   9 #include "net/base/net_errors.h"
  10
  11 namespace mojo {
  12
  13 TCPConnectedSocketImpl::TCPConnectedSocketImpl(
  14     scoped_ptr<net::TCPSocket> socket,
  15     ScopedDataPipeConsumerHandle send_stream,
  16     ScopedDataPipeProducerHandle receive_stream)
  17     : socket_(socket.Pass()),
  18       send_stream_(send_stream.Pass()),
  19       receive_stream_(receive_stream.Pass()),
  20       weak_ptr_factory_(this) {
  21   // Queue up async communication.
  22   ReceiveMore();
  23   SendMore();
  24 }
  25
  26 TCPConnectedSocketImpl::~TCPConnectedSocketImpl() {
  27 }
  28
  29 void TCPConnectedSocketImpl::ReceiveMore() {
  30   DCHECK(!pending_receive_.get());
  31
  32   uint32_t num_bytes;
  33   MojoResult result = NetToMojoPendingBuffer::BeginWrite(
  34       &receive_stream_, &pending_receive_, &num_bytes);
  35   if (result == MOJO_RESULT_SHOULD_WAIT) {
  36     // The pipe is full. We need to wait for it to have more space.
  37     receive_handle_watcher_.Start(
  38         receive_stream_.get(),
  39         MOJO_HANDLE_SIGNAL_WRITABLE, MOJO_DEADLINE_INDEFINITE,
  40         base::Bind(&TCPConnectedSocketImpl::OnReceiveStreamReady,
  41                    weak_ptr_factory_.GetWeakPtr()));
  42     return;
  43   } else if (result != MOJO_RESULT_OK) {
  44     // The receive stream is in a bad state.
  45     // TODO(darin): How should this be communicated to our client?
  46     socket_->Close();
  47     return;
  48   }
  49
  50   // Mojo is ready for the receive.
  51   CHECK_GT(static_cast<uint32_t>(std::numeric_limits<int>::max()), num_bytes);
  52   scoped_refptr<net::IOBuffer> buf(
  53       new NetToMojoIOBuffer(pending_receive_.get()));
  54   int read_result = socket_->Read(
  55       buf.get(), static_cast<int>(num_bytes),
  56       base::Bind(&TCPConnectedSocketImpl::DidReceive, base::Unretained(this),
  57                  false));
  58   if (read_result == net::ERR_IO_PENDING) {
  59     // Pending I/O, wait for result in DidReceive().
  60   } else if (read_result >= 0) {
  61     // Synchronous data ready.
  62     DidReceive(true, read_result);
  63   } else {
  64     // Some kind of error.
  65     // TODO(brettw) notify caller of error.
  66     socket_->Close();
  67   }
  68 }
  69
  70 void TCPConnectedSocketImpl::OnReceiveStreamReady(MojoResult result) {
  71   // TODO(darin): Handle a bad |result| value.
  72   ReceiveMore();
  73 }
  74
  75 void TCPConnectedSocketImpl::DidReceive(bool completed_synchronously,
  76                                         int result) {
  77   if (result < 0) {
  78     // Error.
  79     pending_receive_ = NULL;  // Closes the pipe (owned by the pending write).
  80     // TODO(brettw) notify the caller of an error?
  81     socket_->Close();
  82     return;
  83   }
  84
  85   receive_stream_ = pending_receive_->Complete(result);
  86   pending_receive_ = NULL;
  87
  88   // Schedule more reading.
  89   if (completed_synchronously) {
  90     // Don't recursively call ReceiveMore if this is a sync read.
  91     base::MessageLoop::current()->PostTask(
  92         FROM_HERE,
  93         base::Bind(&TCPConnectedSocketImpl::ReceiveMore,
  94                    weak_ptr_factory_.GetWeakPtr()));
  95   } else {
  96     ReceiveMore();
  97   }
  98 }
  99
 100 void TCPConnectedSocketImpl::SendMore() {
 101   uint32_t num_bytes = 0;
 102   MojoResult result = MojoToNetPendingBuffer::BeginRead(
 103       &send_stream_, &pending_send_, &num_bytes);
 104   if (result == MOJO_RESULT_SHOULD_WAIT) {
 105     // Data not ready, wait for it.
 106     send_handle_watcher_.Start(
 107         send_stream_.get(),
 108         MOJO_HANDLE_SIGNAL_READABLE, MOJO_DEADLINE_INDEFINITE,
 109         base::Bind(&TCPConnectedSocketImpl::OnSendStreamReady,
 110                    weak_ptr_factory_.GetWeakPtr()));
 111     return;
 112   } else if (result != MOJO_RESULT_OK) {
 113     // TODO(brettw) notify caller of error.
 114     socket_->Close();
 115     return;
 116   }
 117
 118   // Got a buffer from Mojo, give it to the socket. Note that the sockets may
 119   // do partial writes.
 120   scoped_refptr<net::IOBuffer> buf(new MojoToNetIOBuffer(pending_send_.get()));
 121   int write_result = socket_->Write(
 122       buf.get(), static_cast<int>(num_bytes),
 123       base::Bind(&TCPConnectedSocketImpl::DidSend, base::Unretained(this),
 124                  false));
 125   if (write_result == net::ERR_IO_PENDING) {
 126     // Pending I/O, wait for result in DidSend().
 127   } else if (write_result >= 0) {
 128     // Synchronous data consumed.
 129     DidSend(true, write_result);
 130   }
 131 }
 132
 133 void TCPConnectedSocketImpl::OnSendStreamReady(MojoResult result) {
 134   // TODO(brettw): Handle a bad |result| value.
 135   SendMore();
 136 }
 137
 138 void TCPConnectedSocketImpl::DidSend(bool completed_synchronously,
 139                                      int result) {
 140   if (result < 0) {
 141     // TODO(brettw) report error.
 142     pending_send_ = NULL;
 143     socket_->Close();
 144     return;
 145   }
 146
 147   // Take back ownership of the stream and free the IOBuffer.
 148   send_stream_ = pending_send_->Complete(result);
 149   pending_send_ = NULL;
 150
 151   // Schedule more writing.
 152   if (completed_synchronously) {
 153     // Don't recursively call SendMore if this is a sync read.
 154     base::MessageLoop::current()->PostTask(
 155         FROM_HERE,
 156         base::Bind(&TCPConnectedSocketImpl::SendMore,
 157                    weak_ptr_factory_.GetWeakPtr()));
 158   } else {
 159     SendMore();
 160   }
 161 }
 162
 163 }  // namespace mojo