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   scoped_refptr<StringIOBuffer> buf(
  31       new StringIOBuffer(std::string(buffer, buf_len)));
  32   DCHECK(!IsWriteBlocked());
  33   int rv = socket_->Write(buf.get(),
  34                           buf_len,
  35                           base::Bind(&QuicDefaultPacketWriter::OnWriteComplete,
  36                                      weak_factory_.GetWeakPtr()));
  37   WriteStatus status = WRITE_STATUS_OK;
  38   if (rv < 0) {
  39     if (rv != ERR_IO_PENDING) {
  40       UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
  41       status = WRITE_STATUS_ERROR;
  42     } else {
  43       status = WRITE_STATUS_BLOCKED;
  44       write_blocked_ = true;
  45     }
  46   }
  47
  48   return WriteResult(status, rv);
  49 }
  50
  51 bool QuicDefaultPacketWriter::IsWriteBlockedDataBuffered() const {
  52   // Chrome sockets' Write() methods buffer the data until the Write is
  53   // permitted.
  54   return true;
  55 }
  56
  57 bool QuicDefaultPacketWriter::IsWriteBlocked() const {
  58   return write_blocked_;
  59 }
  60
  61 void QuicDefaultPacketWriter::SetWritable() {
  62   write_blocked_ = false;
  63 }
  64
  65 void QuicDefaultPacketWriter::OnWriteComplete(int rv) {
  66   DCHECK_NE(rv, ERR_IO_PENDING);
  67   write_blocked_ = false;
  68   WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
  69   connection_->OnPacketSent(result);
  70   connection_->OnCanWrite();
  71 }
  72
  73 }  // namespace net