Skip to content
Navigation Menu
{{ message }}
-
Notifications
You must be signed in to change notification settings - Fork 6
Expand file tree
/
Copy pathserver.hpp
More file actions
359 lines (334 loc) · 12.8 KB
/
Copy pathserver.hpp
File metadata and controls
359 lines (334 loc) · 12.8 KB
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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
#pragma once
#include "service_resolver.hpp"
#include "socket.hpp"
#include "socket_operations.hpp"
#include "thread_pool.hpp"
#include <array>
#include <atomic>
#include <cassert>
#include <functional>
#include <iostream>
#include <map>
#include <mutex>
#include <optional>
#include <thread>
#include <utility>
#include <variant>
#include <vector>
namespace netlib {
struct client_endpoint {
netlib::socket socket;
sockaddr addr{};
socklen_t addr_len = sizeof(sockaddr);
bool operator==(const client_endpoint &rhs) const
{
// we only consider the socket to be relevant
return socket == rhs.socket;
}
bool operator!=(const client_endpoint &rhs) const
{
return !(rhs == *this);
}
bool operator<(const client_endpoint &rhs) const
{
if (!socket.is_valid()) {
return false;
}
if (!rhs.socket.is_valid()) {
return true;
}
return socket.get_raw().value() < rhs.socket.get_raw().value();
}
bool operator>(const client_endpoint &rhs) const
{
return rhs < *this;
}
bool operator<=(const client_endpoint &rhs) const
{
return !(rhs < *this);
}
bool operator>=(const client_endpoint &rhs) const
{
return !(*this < rhs);
}
};
struct server_response {
std::vector<uint8_t> answer{};
bool terminate = false;
};
using callback_connect_t = std::function<server_response(client_endpoint)>;
using callback_recv_t = std::function<server_response(client_endpoint, std::vector<uint8_t>)>;
using callback_error_t = std::function<void(client_endpoint, std::error_condition)>;
class server {
private:
std::optional<netlib::socket> _listener_sock;
int32_t _accept_queue_size = 10;
std::vector<client_endpoint> _clients;
std::map<client_endpoint, std::queue<std::vector<uint8_t>>> _out_queue;
std::mutex _mutex;
std::atomic<bool> _server_active = false;
callback_connect_t _cb_onconnect{};
callback_recv_t _cb_on_recv{};
callback_error_t _cb_on_error{};
std::thread _accept_thread;
std::thread _processor_thread;
netlib::thread_pool _thread_pool; //= netlib::thread_pool::create<1,1>();
std::map<socket_t, std::atomic<bool>> _busy_map;
inline void processing_func()
{
while (_server_active) {
fd_set fdset;
socket_t highest_fd = 0;
FD_ZERO(&fdset);
std::vector<client_endpoint> local_clients;
{
std::lock_guard<std::mutex> lock(_mutex);
local_clients = _clients;
for (auto &client : local_clients) {
socket_t fd = client.socket.get_raw().value();
assert(_busy_map.contains(fd));
if (_busy_map[fd]) {
// this fd is currently being handled by a task in threadpool
continue;
}
if (highest_fd < fd) {
highest_fd = fd;
}
FD_SET(fd, &fdset);
}
}
// windows returns WSAEINVAL if we have nothing to pass to select, so we
// need to filter this previously and elmulate the sleeping
if (!highest_fd) {
std::this_thread::sleep_for(std::chrono::milliseconds(5));
continue;
}
// we want the timeout to be fairly low, so that we avoid situations where
// we have a new client in _clients, but are not monitoring it yet - that
// would mean we have a "hardcoded" delay in servicing a new clients
// packets
timeval tv{.tv_sec = 0, .tv_usec = 5 * 1000}; // 5ms
int32_t select_res = ::select(highest_fd + 1, &fdset, nullptr, nullptr, &tv);
if (select_res > 0) {
std::vector<client_endpoint> client_refs(select_res);
int32_t index = 0;
{
std::lock_guard<std::mutex> lock(_mutex);
for (auto &client : local_clients) {
socket_t fd = client.socket.get_raw().value();
if (FD_ISSET(fd, &fdset)) {
client_refs[index++] = client;
assert(_busy_map.contains(fd));
_busy_map[fd] = true;
}
}
}
assert(index == select_res);
// add callback tasks to threadpool for processing
for (auto &client_to_recv : client_refs) {
_thread_pool.add_task(
[&](client_endpoint ce) {
socket_t id = ce.socket.get_raw().value();
std::error_condition error = this->handle_client(ce);
if ((error) && (_cb_on_error)) {
_cb_on_error(ce, error);
}
std::lock_guard<std::mutex> lock(_mutex);
if (_busy_map.contains(id)) {
_busy_map[id] = false;
}
},
client_to_recv);
}
} else if (select_res == 0) {
// nothing interesting happened before timeout
} else {
// error was returned
}
}
}
inline void accept_func()
{
client_endpoint new_endpoint;
while (_server_active) {
std::this_thread::sleep_for(std::chrono::milliseconds(10));
new_endpoint.addr_len = sizeof(addrinfo);
socket_t status = ::accept(_listener_sock->get_raw().value(), &new_endpoint.addr, &new_endpoint.addr_len);
if (status != INVALID_SOCKET) {
new_endpoint.socket.set_raw(status);
new_endpoint.socket.set_nonblocking(true);
if (_cb_onconnect) {
netlib::server_response greeting = _cb_onconnect(new_endpoint);
if (!greeting.answer.empty()) {
std::error_condition send_error = send_to_endpoint(greeting.answer, new_endpoint);
if (send_error && _cb_on_error) {
_cb_on_error(new_endpoint, std::errc::connection_aborted);
}
}
if (greeting.terminate) {
if (_cb_on_error) {
_cb_on_error(new_endpoint, std::errc::connection_aborted);
}
remove_client(new_endpoint);
continue;
}
}
if (new_endpoint.socket.is_valid()) {
std::lock_guard<std::mutex> lock(_mutex);
_clients.push_back(new_endpoint);
_busy_map[status] = false;
}
}
}
}
inline std::error_condition handle_client(client_endpoint endpoint)
{
//we already know that this socket has some data, so we dont timeout here
auto recv_result = netlib::operations::recv(endpoint.socket, 0);
if (!recv_result.first.empty() && _cb_on_recv) {
netlib::server_response response = _cb_on_recv(endpoint, recv_result.first);
if (!response.answer.empty()) {
std::error_condition send_error = send_to_endpoint(response.answer, endpoint);
if (send_error) {
return send_error;
}
}
if (response.terminate) {
remove_client(endpoint);
return std::errc::connection_aborted;
}
}
if (recv_result.second == std::errc::connection_aborted) {
remove_client(endpoint);
return std::errc::connection_aborted;
}
return recv_result.second;
}
bool remove_client(client_endpoint &ce)
{
// the remove_if-> erase idiom is perhaps my most hated part about std
// containers
std::lock_guard<std::mutex> lock(_mutex);
_busy_map.erase(ce.socket.get_raw().value());
std::erase_if(_clients, [&](const client_endpoint &single_endpoint) {
return (ce.socket.get_raw().value() == single_endpoint.socket.get_raw().value());
});
ce.socket.close();
return true;
}
std::error_condition send_to_endpoint(const std::vector<uint8_t> &data, client_endpoint endpoint)
{
if (!endpoint.socket.is_valid()) {
return std::errc::not_a_socket;
}
auto send_res = netlib::operations::send(endpoint.socket, data, std::chrono::milliseconds(1000));
if (send_res.first != data.size()) {
return std::errc::interrupted;
}
return send_res.second;
}
public:
server()
{
netlib::socket::initialize_system();
}
virtual ~server()
{
stop();
}
inline std::error_condition create(const std::string &bind_host, const std::variant<std::string, uint16_t> &service,
AddressFamily address_family, AddressProtocol address_protocol)
{
if (_listener_sock.has_value()) {
this->stop();
}
const std::string service_string =
std::holds_alternative<uint16_t>(service) ? std::to_string(std::get<uint16_t>(service)) : std::get<std::string>(service);
std::pair<addrinfo *, std::error_condition> addrinfo_result =
service_resolver::get_addrinfo(std::nullopt, service_string, address_family, address_protocol, AI_PASSIVE);
if (addrinfo_result.first == nullptr) {
return addrinfo_result.second;
}
auto close_and_free = [&]() {
this->stop();
freeaddrinfo(addrinfo_result.first);
};
for (addrinfo *res_addrinfo = addrinfo_result.first; res_addrinfo != nullptr; res_addrinfo = res_addrinfo->ai_next) {
_listener_sock = netlib::socket();
std::error_condition s_create_error =
_listener_sock->create(res_addrinfo->ai_family, res_addrinfo->ai_socktype, res_addrinfo->ai_protocol);
if (s_create_error) {
close_and_free();
continue;
}
_listener_sock->set_reuseaddr(true);
_listener_sock->set_nonblocking(true); // we want to be able to join
int32_t res = ::bind(_listener_sock->get_raw().value(), res_addrinfo->ai_addr, res_addrinfo->ai_addrlen);
if (res < 0) {
close_and_free();
continue;
}
if (address_protocol == AddressProtocol::TCP) {
res = ::listen(_listener_sock->get_raw().value(), _accept_queue_size);
if (res < 0) {
close_and_free();
continue;
}
}
// all went well
break;
}
if (_listener_sock) {
_server_active = true;
_accept_thread = std::thread(&server::accept_func, this);
_processor_thread = std::thread(&server::processing_func, this);
return {};
}
return socket_get_last_error();
}
inline void register_callback_on_connect(callback_connect_t onconnect)
{
_cb_onconnect = std::move(onconnect);
};
inline void register_callback_on_recv(callback_recv_t onrecv)
{
_cb_on_recv = std::move(onrecv);
};
inline void register_callback_on_error(callback_error_t onerror)
{
_cb_on_error = std::move(onerror);
};
inline std::error_condition send_data(const std::vector<uint8_t> &data, const std::vector<netlib::client_endpoint> &endpoints)
{
std::lock_guard<std::mutex> lock(_mutex);
std::vector<client_endpoint> list = (endpoints.empty()) ? _clients : endpoints;
std::for_each(list.begin(), list.end(), [&](const netlib::client_endpoint &ce) {
//_out_queue[ce].push(data);
std::error_condition send_error = send_to_endpoint(data, ce);
if ((send_error) && (_cb_on_error)) {
_cb_on_error(ce, send_error);
}
});
return {};
}
inline void stop()
{
_server_active = false;
if (_accept_thread.joinable()) {
_accept_thread.join();
}
if (_processor_thread.joinable()) {
_processor_thread.join();
}
if (_listener_sock.has_value()) {
_listener_sock->close();
_listener_sock.reset();
}
}
inline std::size_t get_client_count()
{
std::lock_guard<std::mutex> lock(_mutex);
return _clients.size();
}
};
} // namespace netlib
You can’t perform that action at this time.