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
|
/*
* Copyright (c) 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 "ATSConnector.h"
#include "HTTP1.xMessageFastParser.h"
#include <hicn/transport/utils/branch_prediction.h>
#include <hicn/transport/utils/log.h>
#include <iostream>
namespace transport {
ATSConnector::ATSConnector(asio::io_service &io_service,
std::string &ip_address, std::string &port,
ContentReceivedCallback receive_callback,
OnReconnect on_reconnect_callback)
: io_service_(io_service),
socket_(io_service_),
resolver_(io_service_),
endpoint_iterator_(resolver_.resolve({ip_address, port})),
timer_(io_service),
is_reconnection_(false),
data_available_(false),
receive_callback_(receive_callback),
on_reconnect_callback_(on_reconnect_callback) {
input_buffer_.prepare(buffer_size + 2048);
state_ = ConnectorState::CONNECTING;
doConnect();
}
ATSConnector::~ATSConnector() {}
void ATSConnector::send(const uint8_t *packet, std::size_t len,
ContentSentCallback &&content_sent) {
asio::async_write(
socket_, asio::buffer(packet, len),
[content_sent = std::move(content_sent)](
std::error_code ec, std::size_t /*length*/) { content_sent(); });
}
void ATSConnector::send(utils::MemBuf *buffer,
ContentSentCallback &&content_sent) {
io_service_.dispatch([this, buffer, callback = std::move(content_sent)]() {
bool write_in_progress = !write_msgs_.empty();
write_msgs_.emplace_back(std::unique_ptr<utils::MemBuf>(buffer),
std::move(callback));
if (TRANSPORT_EXPECT_TRUE(state_ == ConnectorState::CONNECTED)) {
if (!write_in_progress) {
doWrite();
}
} else {
TRANSPORT_LOGD(" Tell the handle connect it has data to write");
data_available_ = true;
}
});
}
void ATSConnector::close() {
if (state_ != ConnectorState::CLOSED) {
state_ = ConnectorState::CLOSED;
if (socket_.is_open()) {
socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both);
socket_.close();
// on_disconnect_callback_();
}
}
}
void ATSConnector::doWrite() {
auto &buffer = write_msgs_.front().first;
asio::async_write(socket_, asio::buffer(buffer->data(), buffer->length()),
[this](std::error_code ec, std::size_t length) {
if (TRANSPORT_EXPECT_FALSE(!ec)) {
TRANSPORT_LOGD("Content successfully sent!");
write_msgs_.front().second();
write_msgs_.pop_front();
if (!write_msgs_.empty()) {
doWrite();
}
} else {
TRANSPORT_LOGD("Content NOT sent!");
}
});
} // namespace transport
void ATSConnector::handleRead(std::error_code ec, std::size_t length,
std::size_t size) {
if (TRANSPORT_EXPECT_TRUE(!ec)) {
size -= length;
const uint8_t *buffer =
asio::buffer_cast<const uint8_t *>(input_buffer_.data());
receive_callback_(buffer, input_buffer_.size(), !size, false);
input_buffer_.consume(input_buffer_.size());
if (!size) {
doReadHeader();
} else {
auto to_read = size >= buffer_size ? buffer_size : size;
asio::async_read(
socket_, input_buffer_, asio::transfer_exactly(to_read),
std::bind(&ATSConnector::handleRead, this, std::placeholders::_1,
std::placeholders::_2, size));
}
} else if (ec == asio::error::eof) {
input_buffer_.consume(input_buffer_.size());
tryReconnection();
}
}
void ATSConnector::doReadBody(std::size_t size) {
auto to_read =
size >= buffer_size ? (buffer_size - input_buffer_.size()) : size;
asio::async_read(
socket_, input_buffer_, asio::transfer_exactly(to_read),
std::bind(&ATSConnector::handleRead, this, std::placeholders::_1,
std::placeholders::_2, size));
}
void ATSConnector::doReadHeader() {
asio::async_read_until(
socket_, input_buffer_, "\r\n\r\n",
[this](std::error_code ec, std::size_t length) {
if (TRANSPORT_EXPECT_TRUE(!ec)) {
const uint8_t *buffer =
asio::buffer_cast<const uint8_t *>(input_buffer_.data());
std::size_t size = HTTPMessageFastParser::hasBody(buffer, length);
auto additional_bytes = input_buffer_.size() - length;
auto bytes_to_read = size - additional_bytes;
receive_callback_(buffer, length, !size, true);
input_buffer_.consume(length);
doReadBody(bytes_to_read);
} else {
input_buffer_.consume(input_buffer_.size());
tryReconnection();
}
});
}
void ATSConnector::tryReconnection() {
TRANSPORT_LOGD("Connection lost. Trying to reconnect...\n");
if (state_ == ConnectorState::CONNECTED) {
state_ = ConnectorState::CONNECTING;
is_reconnection_ = true;
io_service_.post([this]() {
if (socket_.is_open()) {
// socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both);
socket_.close();
}
startConnectionTimer();
doConnect();
});
}
}
void ATSConnector::doConnect() {
asio::async_connect(socket_, endpoint_iterator_,
[this](std::error_code ec, tcp::resolver::iterator) {
if (!ec) {
timer_.cancel();
state_ = ConnectorState::CONNECTED;
asio::ip::tcp::no_delay noDelayOption(true);
socket_.set_option(noDelayOption);
// on_reconnect_callback_();
doReadHeader();
if (data_available_ && !write_msgs_.empty()) {
data_available_ = false;
doWrite();
}
if (is_reconnection_) {
is_reconnection_ = false;
TRANSPORT_LOGD("Connection recovered!");
}
} else {
TRANSPORT_LOGE("Impossible to reconnect.");
close();
}
});
}
bool ATSConnector::checkConnected() {
return state_ == ConnectorState::CONNECTED;
}
void ATSConnector::startConnectionTimer() {
timer_.expires_from_now(std::chrono::seconds(10));
timer_.async_wait(
std::bind(&ATSConnector::handleDeadline, this, std::placeholders::_1));
}
void ATSConnector::handleDeadline(const std::error_code &ec) {
if (!ec) {
io_service_.post([this]() {
socket_.close();
TRANSPORT_LOGE("Error connecting. Is the server running?\n");
io_service_.stop();
});
}
}
} // namespace transport
|
