net/quic/quic_default_packet_writer.cc

   1 // Copyright 2013 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 "net/quic/quic_default_packet_writer.h"
   6
   7 #include "base/location.h"
   8 #include "base/logging.h"
   9 #include "base/metrics/sparse_histogram.h"
  10 #include "net/base/io_buffer.h"
  11 #include "net/base/net_errors.h"
  12
  13 namespace net {
  14
  15 QuicDefaultPacketWriter::QuicDefaultPacketWriter() : weak_factory_(this) {
  16 }
  17
  18 QuicDefaultPacketWriter::QuicDefaultPacketWriter(DatagramClientSocket* socket)
  19     : weak_factory_(this),
  20       socket_(socket),
  21       write_blocked_(false) {
  22 }
  23
  24 QuicDefaultPacketWriter::~QuicDefaultPacketWriter() {}
  25
  26 WriteResult QuicDefaultPacketWriter::WritePacket(
  27     const char* buffer, size_t buf_len,
  28     const net::IPAddressNumber& self_address,
  29     const net::IPEndPoint& peer_address,
  30     QuicBlockedWriterInterface* blocked_writer) {
  31   scoped_refptr<StringIOBuffer> buf(
  32       new StringIOBuffer(std::string(buffer, buf_len)));
  33   DCHECK(!IsWriteBlocked());
  34   int rv = socket_->Write(buf.get(),
  35                           buf_len,
  36                           base::Bind(&QuicDefaultPacketWriter::OnWriteComplete,
  37                                      weak_factory_.GetWeakPtr()));
  38   WriteStatus status = WRITE_STATUS_OK;
  39   if (rv < 0) {
  40     if (rv != ERR_IO_PENDING) {
  41       UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
  42       status = WRITE_STATUS_ERROR;
  43     } else {
  44       status = WRITE_STATUS_BLOCKED;
  45       write_blocked_ = true;
  46     }
  47   }
  48
  49   return WriteResult(status, rv);
  50 }
  51
  52 bool QuicDefaultPacketWriter::IsWriteBlockedDataBuffered() const {
  53   // Chrome sockets' Write() methods buffer the data until the Write is
  54   // permitted.
  55   return true;
  56 }
  57
  58 bool QuicDefaultPacketWriter::IsWriteBlocked() const {
  59   return write_blocked_;
  60 }
  61
  62 void QuicDefaultPacketWriter::SetWritable() {
  63   write_blocked_ = false;
  64 }
  65
  66 void QuicDefaultPacketWriter::OnWriteComplete(int rv) {
  67   DCHECK_NE(rv, ERR_IO_PENDING);
  68   write_blocked_ = false;
  69   WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
  70   connection_->OnPacketSent(result);
  71   connection_->OnCanWrite();
  72 }
  73
  74 }  // namespace net