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/histogram_macros.h"
  10 #include "base/metrics/sparse_histogram.h"
  11 #include "net/base/io_buffer.h"
  12 #include "net/base/net_errors.h"
  13
  14 namespace net {
  15
  16 QuicDefaultPacketWriter::QuicDefaultPacketWriter() : weak_factory_(this) {
  17 }
  18
  19 QuicDefaultPacketWriter::QuicDefaultPacketWriter(DatagramClientSocket* socket)
  20     : socket_(socket),
  21       write_blocked_(false),
  22       weak_factory_(this) {
  23 }
  24
  25 QuicDefaultPacketWriter::~QuicDefaultPacketWriter() {}
  26
  27 WriteResult QuicDefaultPacketWriter::WritePacket(
  28     const char* buffer,
  29     size_t buf_len,
  30     const IPAddressNumber& self_address,
  31     const IPEndPoint& peer_address) {
  32   scoped_refptr<StringIOBuffer> buf(
  33       new StringIOBuffer(std::string(buffer, buf_len)));
  34   DCHECK(!IsWriteBlocked());
  35   base::TimeTicks now = base::TimeTicks::Now();
  36   int rv = socket_->Write(buf.get(),
  37                           buf_len,
  38                           base::Bind(&QuicDefaultPacketWriter::OnWriteComplete,
  39                                      weak_factory_.GetWeakPtr()));
  40   WriteStatus status = WRITE_STATUS_OK;
  41   if (rv < 0) {
  42     if (rv != ERR_IO_PENDING) {
  43       UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
  44       status = WRITE_STATUS_ERROR;
  45     } else {
  46       status = WRITE_STATUS_BLOCKED;
  47       write_blocked_ = true;
  48     }
  49   }
  50
  51   base::TimeDelta delta = base::TimeTicks::Now() - now;
  52   if (status == WRITE_STATUS_OK) {
  53     UMA_HISTOGRAM_TIMES("Net.QuicSession.PacketWriteTime.Synchronous", delta);
  54   } else if (status == WRITE_STATUS_BLOCKED) {
  55     UMA_HISTOGRAM_TIMES("Net.QuicSession.PacketWriteTime.Asynchronous", delta);
  56   }
  57
  58   return WriteResult(status, rv);
  59 }
  60
  61 bool QuicDefaultPacketWriter::IsWriteBlockedDataBuffered() const {
  62   // Chrome sockets' Write() methods buffer the data until the Write is
  63   // permitted.
  64   return true;
  65 }
  66
  67 bool QuicDefaultPacketWriter::IsWriteBlocked() const {
  68   return write_blocked_;
  69 }
  70
  71 void QuicDefaultPacketWriter::SetWritable() {
  72   write_blocked_ = false;
  73 }
  74
  75 void QuicDefaultPacketWriter::OnWriteComplete(int rv) {
  76   DCHECK_NE(rv, ERR_IO_PENDING);
  77   write_blocked_ = false;
  78   if (rv < 0) {
  79     connection_->OnWriteError(rv);
  80   }
  81   connection_->OnCanWrite();
  82 }
  83
  84 }  // namespace net