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      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     : socket_(socket),
     20       write_blocked_(false),
     21       weak_factory_(this) {
     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   if (rv < 0) {
     69     connection_->OnWriteError(rv);
     70   }
     71   connection_->OnCanWrite();
     72 }
     73 
     74 }  // namespace net
     75