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
|
#include <network/poller.hpp>
#include <logger/logger.hpp>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <cstring>
#include <iostream>
#include <stdexcept>
Poller::Poller()
{
#if POLLER == POLL
this->nfds = 0;
#elif POLLER == EPOLL
this->epfd = ::epoll_create1(0);
if (this->epfd == -1)
{
log_error("epoll failed: " << strerror(errno));
throw std::runtime_error("Could not create epoll instance");
}
#endif
}
Poller::~Poller()
{
}
void Poller::add_socket_handler(std::shared_ptr<SocketHandler> socket_handler)
{
// Raise an error if that socket is already in the list
const auto it = this->socket_handlers.find(socket_handler->get_socket());
if (it != this->socket_handlers.end())
throw std::runtime_error("Trying to insert SocketHandler already managed");
this->socket_handlers.emplace(socket_handler->get_socket(), socket_handler);
socket_handler->set_poller(this);
// We always watch all sockets for receive events
#if POLLER == POLL
this->fds[this->nfds].fd = socket_handler->get_socket();
this->fds[this->nfds].events = POLLIN;
this->nfds++;
#endif
#if POLLER == EPOLL
struct epoll_event event = {EPOLLIN, {socket_handler.get()}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_ADD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not add socket to epoll");
}
#endif
}
void Poller::remove_socket_handler(const socket_t socket)
{
const auto it = this->socket_handlers.find(socket);
if (it == this->socket_handlers.end())
throw std::runtime_error("Trying to remove a SocketHandler that is not managed");
this->socket_handlers.erase(it);
#if POLLER == POLL
for (size_t i = 0; i < this->nfds; i++)
{
if (this->fds[i].fd == socket)
{
// Move all subsequent pollfd by one on the left, erasing the
// value of the one we remove
for (size_t j = i; j < this->nfds - 1; ++j)
{
this->fds[j].fd = this->fds[j+1].fd;
this->fds[j].events= this->fds[j+1].events;
}
this->nfds--;
}
}
#elif POLLER == EPOLL
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_DEL, socket, nullptr);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not remove socket from epoll");
}
#endif
}
void Poller::watch_send_events(SocketHandler* socket_handler)
{
#if POLLER == POLL
for (size_t i = 0; i <= this->nfds; ++i)
{
if (this->fds[i].fd == socket_handler->get_socket())
{
this->fds[i].events = POLLIN|POLLOUT;
return;
}
}
throw std::runtime_error("Cannot watch a non-registered socket for send events");
#elif POLLER == EPOLL
struct epoll_event event = {EPOLLIN|EPOLLOUT, {socket_handler}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_MOD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not modify socket flags in epoll");
}
#endif
}
void Poller::stop_watching_send_events(SocketHandler* socket_handler)
{
#if POLLER == POLL
for (size_t i = 0; i <= this->nfds; ++i)
{
if (this->fds[i].fd == socket_handler->get_socket())
{
this->fds[i].events = POLLIN;
return;
}
}
throw std::runtime_error("Cannot watch a non-registered socket for send events");
#elif POLLER == EPOLL
struct epoll_event event = {EPOLLIN, {socket_handler}};
const int res = ::epoll_ctl(this->epfd, EPOLL_CTL_MOD, socket_handler->get_socket(), &event);
if (res == -1)
{
log_error("epoll_ctl failed: " << strerror(errno));
throw std::runtime_error("Could not modify socket flags in epoll");
}
#endif
}
int Poller::poll(const std::chrono::milliseconds& timeout)
{
if (this->socket_handlers.size() == 0)
return -1;
#if POLLER == POLL
int nb_events = ::poll(this->fds, this->nfds, timeout.count());
if (nb_events < 0)
{
if (errno == EINTR)
return true;
log_error("poll failed: " << strerror(errno));
throw std::runtime_error("Poll failed");
}
// We cannot possibly have more ready events than the number of fds we are
// watching
assert(static_cast<unsigned int>(nb_events) <= this->nfds);
for (size_t i = 0; i <= this->nfds && nb_events != 0; ++i)
{
if (this->fds[i].revents == 0)
continue;
else if (this->fds[i].revents & POLLIN)
{
auto socket_handler = this->socket_handlers.at(this->fds[i].fd);
socket_handler->on_recv();
nb_events--;
}
else if (this->fds[i].revents & POLLOUT)
{
auto socket_handler = this->socket_handlers.at(this->fds[i].fd);
if (socket_handler->is_connected())
socket_handler->on_send();
else
socket_handler->connect();
nb_events--;
}
}
return 1;
#elif POLLER == EPOLL
static const size_t max_events = 12;
struct epoll_event revents[max_events];
const int nb_events = ::epoll_wait(this->epfd, revents, max_events, timeout.count());
if (nb_events == -1)
{
if (errno == EINTR)
return 0;
log_error("epoll wait: " << strerror(errno));
throw std::runtime_error("Epoll_wait failed");
}
for (int i = 0; i < nb_events; ++i)
{
auto socket_handler = static_cast<SocketHandler*>(revents[i].data.ptr);
if (revents[i].events & EPOLLIN)
socket_handler->on_recv();
if (revents[i].events & EPOLLOUT)
{
if (socket_handler->is_connected())
socket_handler->on_send();
else
socket_handler->connect();
}
}
return nb_events;
#endif
}
size_t Poller::size() const
{
return this->socket_handlers.size();
}
|
