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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 #ifndef NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_ | |
6 #define NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_ | |
7 | |
8 #include <list> | |
9 #include <string> | |
10 | |
11 #include "base/basictypes.h" | |
12 #include "base/logging.h" | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "base/synchronization/lock.h" | |
15 #include "net/quic/quic_alarm.h" | |
16 #include "net/quic/test_tools/quic_test_utils.h" | |
17 #include "net/tools/quic/quic_epoll_clock.h" | |
18 #include "net/tools/quic/quic_packet_writer_wrapper.h" | |
19 #include "net/tools/quic/test_tools/quic_test_client.h" | |
20 #include "net/tools/quic/test_tools/quic_test_utils.h" | |
21 | |
22 namespace net { | |
23 namespace tools { | |
24 namespace test { | |
25 | |
26 // Simulates a connection that drops packets a configured percentage of the time | |
27 // and has a blocked socket a configured percentage of the time. Also provides | |
28 // the options to delay packets and reorder packets if delay is enabled. | |
29 class PacketDroppingTestWriter : public QuicPacketWriterWrapper { | |
30 public: | |
31 class Delegate { | |
32 public: | |
33 virtual ~Delegate() {} | |
34 virtual void OnPacketSent(WriteResult result) = 0; | |
35 virtual void OnCanWrite() = 0; | |
36 }; | |
37 | |
38 PacketDroppingTestWriter(); | |
39 | |
40 ~PacketDroppingTestWriter() override; | |
41 | |
42 // Must be called before blocking, reordering or delaying (loss is OK). May be | |
43 // called after connecting if the helper is not available before. | |
44 // |on_can_write| will be triggered when fake-unblocking; ownership will be | |
45 // assumed. | |
46 void Initialize(QuicEpollConnectionHelper* helper, Delegate* on_can_write); | |
47 | |
48 // QuicPacketWriter methods: | |
49 WriteResult WritePacket(const char* buffer, | |
50 size_t buf_len, | |
51 const IPAddressNumber& self_address, | |
52 const IPEndPoint& peer_address) override; | |
53 | |
54 bool IsWriteBlocked() const override; | |
55 | |
56 void SetWritable() override; | |
57 | |
58 // Writes out any packet which should have been sent by now | |
59 // to the contained writer and returns the time | |
60 // for the next delayed packet to be written. | |
61 QuicTime ReleaseOldPackets(); | |
62 | |
63 void OnCanWrite(); | |
64 | |
65 // The percent of time a packet is simulated as being lost. | |
66 void set_fake_packet_loss_percentage(int32 fake_packet_loss_percentage) { | |
67 base::AutoLock locked(config_mutex_); | |
68 fake_packet_loss_percentage_ = fake_packet_loss_percentage; | |
69 } | |
70 | |
71 // The percent of time WritePacket will block and set WriteResult's status | |
72 // to WRITE_STATUS_BLOCKED. | |
73 void set_fake_blocked_socket_percentage( | |
74 int32 fake_blocked_socket_percentage) { | |
75 DCHECK(clock_); | |
76 base::AutoLock locked(config_mutex_); | |
77 fake_blocked_socket_percentage_ = fake_blocked_socket_percentage; | |
78 } | |
79 | |
80 // The percent of time a packet is simulated as being reordered. | |
81 void set_fake_reorder_percentage(int32 fake_packet_reorder_percentage) { | |
82 DCHECK(clock_); | |
83 base::AutoLock locked(config_mutex_); | |
84 DCHECK(!fake_packet_delay_.IsZero()); | |
85 fake_packet_reorder_percentage_ = fake_packet_reorder_percentage; | |
86 } | |
87 | |
88 // The delay before writing this packet. | |
89 void set_fake_packet_delay(QuicTime::Delta fake_packet_delay) { | |
90 DCHECK(clock_); | |
91 base::AutoLock locked(config_mutex_); | |
92 fake_packet_delay_ = fake_packet_delay; | |
93 } | |
94 | |
95 // The maximum bandwidth and buffer size of the connection. When these are | |
96 // set, packets will be delayed until a connection with that bandwidth would | |
97 // transmit it. Once the |buffer_size| is reached, all new packets are | |
98 // dropped. | |
99 void set_max_bandwidth_and_buffer_size(QuicBandwidth fake_bandwidth, | |
100 QuicByteCount buffer_size) { | |
101 DCHECK(clock_); | |
102 base::AutoLock locked(config_mutex_); | |
103 fake_bandwidth_ = fake_bandwidth; | |
104 buffer_size_ = buffer_size; | |
105 } | |
106 | |
107 void set_seed(uint64 seed) { | |
108 simple_random_.set_seed(seed); | |
109 } | |
110 | |
111 private: | |
112 // Writes out the next packet to the contained writer and returns the time | |
113 // for the next delayed packet to be written. | |
114 QuicTime ReleaseNextPacket(); | |
115 | |
116 // A single packet which will be sent at the supplied send_time. | |
117 struct DelayedWrite { | |
118 public: | |
119 DelayedWrite(const char* buffer, | |
120 size_t buf_len, | |
121 const IPAddressNumber& self_address, | |
122 const IPEndPoint& peer_address, | |
123 QuicTime send_time); | |
124 ~DelayedWrite(); | |
125 | |
126 std::string buffer; | |
127 const IPAddressNumber self_address; | |
128 const IPEndPoint peer_address; | |
129 QuicTime send_time; | |
130 }; | |
131 | |
132 typedef std::list<DelayedWrite> DelayedPacketList; | |
133 | |
134 const QuicClock* clock_; | |
135 scoped_ptr<QuicAlarm> write_unblocked_alarm_; | |
136 scoped_ptr<QuicAlarm> delay_alarm_; | |
137 scoped_ptr<Delegate> on_can_write_; | |
138 net::test::SimpleRandom simple_random_; | |
139 // Stored packets delayed by fake packet delay or bandwidth restrictions. | |
140 DelayedPacketList delayed_packets_; | |
141 QuicByteCount cur_buffer_size_; | |
142 | |
143 base::Lock config_mutex_; | |
144 int32 fake_packet_loss_percentage_; | |
145 int32 fake_blocked_socket_percentage_; | |
146 int32 fake_packet_reorder_percentage_; | |
147 QuicTime::Delta fake_packet_delay_; | |
148 QuicBandwidth fake_bandwidth_; | |
149 QuicByteCount buffer_size_; | |
150 | |
151 DISALLOW_COPY_AND_ASSIGN(PacketDroppingTestWriter); | |
152 }; | |
153 | |
154 } // namespace test | |
155 } // namespace tools | |
156 } // namespace net | |
157 | |
158 #endif // NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_ | |
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