1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hicn/transport/interfaces/rtc_socket_producer.h>
#include <stdlib.h>
#include <time.h>
#define NACK_HEADER_SIZE 8 // bytes
#define TIMESTAMP_LEN 8 // bytes
#define TCP_HEADER_SIZE 20
#define IP6_HEADER_SIZE 40
#define INIT_PACKET_PRODUCTION_RATE 100 // pps random value (almost 1Mbps)
#define STATS_INTERVAL_DURATION 500 // ms
#define INTEREST_LIFETIME_REDUCTION_FACTOR 0.8
#define INACTIVE_TIME \
500 // ms without producing before the socket
// is considered inactive
#define MILLI_IN_A_SEC 1000 // ms in a second
#define HICN_MAX_DATA_SEQ 0xefffffff
// NACK HEADER
// +-----------------------------------------+
// | 4 bytes: current segment in production |
// +-----------------------------------------+
// | 4 bytes: production rate (bytes x sec) |
// +-----------------------------------------+
//
// PACKET HEADER
// +-----------------------------------------+
// | 8 bytes: TIMESTAMP |
// +-----------------------------------------+
// | packet |
// +-----------------------------------------+
namespace transport {
namespace interface {
RTCProducerSocket::RTCProducerSocket(asio::io_service &io_service)
: ProducerSocket(io_service),
currentSeg_(1),
producedBytes_(0),
producedPackets_(0),
bytesProductionRate_(INIT_PACKET_PRODUCTION_RATE * 1400),
packetsProductionRate_(INIT_PACKET_PRODUCTION_RATE),
perSecondFactor_(MILLI_IN_A_SEC / STATS_INTERVAL_DURATION),
active_(false) {
lastStats_ = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now().time_since_epoch())
.count();
srand((unsigned int)time(NULL));
prodLabel_ = ((rand() % 255) << 24UL);
}
RTCProducerSocket::RTCProducerSocket()
: ProducerSocket(),
currentSeg_(1),
producedBytes_(0),
producedPackets_(0),
bytesProductionRate_(INIT_PACKET_PRODUCTION_RATE * 1400),
packetsProductionRate_(INIT_PACKET_PRODUCTION_RATE),
perSecondFactor_(MILLI_IN_A_SEC / STATS_INTERVAL_DURATION),
active_(false) {
lastStats_ = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now().time_since_epoch())
.count();
srand((unsigned int)time(NULL));
prodLabel_ = ((rand() % 255) << 24UL);
}
RTCProducerSocket::~RTCProducerSocket() {}
void RTCProducerSocket::registerPrefix(const Prefix &producer_namespace) {
ProducerSocket::registerPrefix(producer_namespace);
flowName_ = producer_namespace.getName();
auto family = flowName_.getAddressFamily();
switch (family) {
case AF_INET6:
headerSize_ = (uint32_t)Packet::getHeaderSizeFromFormat(HF_INET6_TCP);
break;
case AF_INET:
headerSize_ = (uint32_t)Packet::getHeaderSizeFromFormat(HF_INET_TCP);
break;
default:
throw errors::RuntimeException("Unknown name format.");
}
}
void RTCProducerSocket::updateStats(uint32_t packet_size, uint64_t now) {
producedBytes_ += packet_size;
producedPackets_++;
uint64_t duration = now - lastStats_;
if (duration >= STATS_INTERVAL_DURATION) {
lastStats_ = now;
bytesProductionRate_ = producedBytes_ * perSecondFactor_;
packetsProductionRate_ = producedPackets_ * perSecondFactor_;
if (packetsProductionRate_.load() == 0) packetsProductionRate_ = 1;
producedBytes_ = 0;
producedPackets_ = 0;
}
}
void RTCProducerSocket::produce(std::unique_ptr<utils::MemBuf> &&buffer) {
auto buffer_size = buffer->length();
if (TRANSPORT_EXPECT_FALSE(buffer_size == 0)) {
return;
}
if (TRANSPORT_EXPECT_FALSE((buffer_size + headerSize_ + TIMESTAMP_LEN) >
data_packet_size_)) {
return;
}
uint64_t now = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now().time_since_epoch())
.count();
{
utils::SpinLock::Acquire locked(lock_);
active_ = true;
lastProduced_ = now;
}
updateStats((uint32_t)(buffer_size + headerSize_ + TIMESTAMP_LEN), now);
ContentObject content_object(flowName_.setSuffix(currentSeg_));
auto payload = utils::MemBuf::create(TIMESTAMP_LEN);
memcpy(payload->writableData(), &now, TIMESTAMP_LEN);
payload->append(TIMESTAMP_LEN);
payload->prependChain(std::move(buffer));
content_object.appendPayload(std::move(payload));
content_object.setLifetime(500); // XXX this should be set by the APP
content_object.setPathLabel(prodLabel_);
if (on_content_object_output_ != VOID_HANDLER) {
on_content_object_output_(*this, content_object);
}
portal_->sendContentObject(content_object);
currentSeg_ = (currentSeg_ + 1) % HICN_MAX_DATA_SEQ;
}
void RTCProducerSocket::onInterest(Interest::Ptr &&interest) {
uint32_t interestSeg = interest->getName().getSuffix();
uint32_t lifetime = interest->getLifetime();
if (on_interest_input_ != VOID_HANDLER) {
on_interest_input_(*this, *interest);
}
bool isActive;
{
utils::SpinLock::Acquire locked(lock_);
isActive = active_;
if (isActive) {
uint64_t now = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now().time_since_epoch())
.count();
if ((now - lastProduced_) > INACTIVE_TIME) {
// socket is inactive
active_ = false;
isActive = false;
}
}
}
if (TRANSPORT_EXPECT_FALSE(!isActive)) {
sendNack(*interest, false);
return;
}
if(interestSeg > HICN_MAX_DATA_SEQ){
sendNack(*interest, isActive);
return;
}
uint32_t max_gap = (uint32_t)floor(
(double)((double)((double)lifetime * INTEREST_LIFETIME_REDUCTION_FACTOR /
1000.0) *
(double)packetsProductionRate_.load()));
if (interestSeg < currentSeg_ || interestSeg > (max_gap + currentSeg_)) {
sendNack(*interest, true);
}
// else drop packet
}
void RTCProducerSocket::sendNack(const Interest &interest, bool isActive) {
auto nack_payload = utils::MemBuf::create(NACK_HEADER_SIZE);
nack_payload->append(NACK_HEADER_SIZE);
ContentObject nack;
nack.appendPayload(std::move(nack_payload));
nack.setName(interest.getName());
uint32_t *payload_ptr = (uint32_t *)nack.getPayload()->data();
*payload_ptr = currentSeg_;
if (isActive) {
*(++payload_ptr) = bytesProductionRate_;
} else {
*(++payload_ptr) = 0;
}
nack.setLifetime(0);
nack.setPathLabel(prodLabel_);
if (on_content_object_output_ != VOID_HANDLER) {
on_content_object_output_(*this, nack);
}
portal_->sendContentObject(nack);
}
} // namespace interface
} // end namespace transport
|
