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(Socket* socket)
  20     : socket_(socket), write_blocked_(false), weak_factory_(this) {}
  21
  22 QuicDefaultPacketWriter::~QuicDefaultPacketWriter() {}
  23
  24 WriteResult QuicDefaultPacketWriter::WritePacket(
  25     const char* buffer,
  26     size_t buf_len,
  27     const IPAddressNumber& self_address,
  28     const IPEndPoint& peer_address) {
  29   scoped_refptr<StringIOBuffer> buf(
  30       new StringIOBuffer(std::string(buffer, buf_len)));
  31   DCHECK(!IsWriteBlocked());
  32   base::TimeTicks now = base::TimeTicks::Now();
  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   base::TimeDelta delta = base::TimeTicks::Now() - now;
  49   if (status == WRITE_STATUS_OK) {
  50     UMA_HISTOGRAM_TIMES("Net.QuicSession.PacketWriteTime.Synchronous", delta);
  51   } else if (status == WRITE_STATUS_BLOCKED) {
  52     UMA_HISTOGRAM_TIMES("Net.QuicSession.PacketWriteTime.Asynchronous", delta);
  53   }
  54
  55   return WriteResult(status, rv);
  56 }
  57
  58 bool QuicDefaultPacketWriter::IsWriteBlockedDataBuffered() const {
  59   // Chrome sockets' Write() methods buffer the data until the Write is
  60   // permitted.
  61   return true;
  62 }
  63
  64 bool QuicDefaultPacketWriter::IsWriteBlocked() const {
  65   return write_blocked_;
  66 }
  67
  68 void QuicDefaultPacketWriter::SetWritable() {
  69   write_blocked_ = false;
  70 }
  71
  72 void QuicDefaultPacketWriter::OnWriteComplete(int rv) {
  73   DCHECK_NE(rv, ERR_IO_PENDING);
  74   write_blocked_ = false;
  75   if (rv < 0) {
  76     connection_->OnWriteError(rv);
  77   }
  78   connection_->OnCanWrite();
  79 }
  80
  81 }  // namespace net