1 // Copyright 2014 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_server_packet_writer.h"
6
7 #include "base/callback_helpers.h"
8 #include "base/location.h"
9 #include "base/logging.h"
10 #include "base/metrics/sparse_histogram.h"
11 #include "net/base/io_buffer.h"
12 #include "net/base/net_errors.h"
13 #include "net/udp/udp_server_socket.h"
14
15 namespace net {
16
QuicServerPacketWriter(UDPServerSocket * socket,QuicBlockedWriterInterface * blocked_writer)17 QuicServerPacketWriter::QuicServerPacketWriter(
18 UDPServerSocket* socket,
19 QuicBlockedWriterInterface* blocked_writer)
20 : socket_(socket),
21 blocked_writer_(blocked_writer),
22 write_blocked_(false),
23 weak_factory_(this) {
24 }
25
~QuicServerPacketWriter()26 QuicServerPacketWriter::~QuicServerPacketWriter() {
27 }
28
WritePacketWithCallback(const char * buffer,size_t buf_len,const IPAddressNumber & self_address,const IPEndPoint & peer_address,WriteCallback callback)29 WriteResult QuicServerPacketWriter::WritePacketWithCallback(
30 const char* buffer,
31 size_t buf_len,
32 const IPAddressNumber& self_address,
33 const IPEndPoint& peer_address,
34 WriteCallback callback) {
35 DCHECK(callback_.is_null());
36 callback_ = callback;
37 WriteResult result = WritePacket(buffer, buf_len, self_address, peer_address);
38 if (result.status != WRITE_STATUS_BLOCKED) {
39 callback_.Reset();
40 }
41 return result;
42 }
43
OnWriteComplete(int rv)44 void QuicServerPacketWriter::OnWriteComplete(int rv) {
45 DCHECK_NE(rv, ERR_IO_PENDING);
46 write_blocked_ = false;
47 WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
48 base::ResetAndReturn(&callback_).Run(result);
49 blocked_writer_->OnCanWrite();
50 }
51
IsWriteBlockedDataBuffered() const52 bool QuicServerPacketWriter::IsWriteBlockedDataBuffered() const {
53 // UDPServerSocket::SendTo buffers the data until the Write is permitted.
54 return true;
55 }
56
IsWriteBlocked() const57 bool QuicServerPacketWriter::IsWriteBlocked() const {
58 return write_blocked_;
59 }
60
SetWritable()61 void QuicServerPacketWriter::SetWritable() {
62 write_blocked_ = false;
63 }
64
WritePacket(const char * buffer,size_t buf_len,const IPAddressNumber & self_address,const IPEndPoint & peer_address)65 WriteResult QuicServerPacketWriter::WritePacket(
66 const char* buffer,
67 size_t buf_len,
68 const IPAddressNumber& self_address,
69 const IPEndPoint& peer_address) {
70 scoped_refptr<StringIOBuffer> buf(
71 new StringIOBuffer(std::string(buffer, buf_len)));
72 DCHECK(!IsWriteBlocked());
73 DCHECK(!callback_.is_null());
74 int rv;
75 if (buf_len <= static_cast<size_t>(std::numeric_limits<int>::max())) {
76 rv = socket_->SendTo(buf.get(),
77 static_cast<int>(buf_len),
78 peer_address,
79 base::Bind(&QuicServerPacketWriter::OnWriteComplete,
80 weak_factory_.GetWeakPtr()));
81 } else {
82 rv = ERR_MSG_TOO_BIG;
83 }
84 WriteStatus status = WRITE_STATUS_OK;
85 if (rv < 0) {
86 if (rv != ERR_IO_PENDING) {
87 UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
88 status = WRITE_STATUS_ERROR;
89 } else {
90 status = WRITE_STATUS_BLOCKED;
91 write_blocked_ = true;
92 }
93 }
94 return WriteResult(status, rv);
95 }
96
97 } // namespace net
98