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
|
#include <xmpp/xmpp_component.hpp>
#include <network/poller.hpp>
#include <config/config.hpp>
#include <logger/logger.hpp>
#include <iostream>
#include <memory>
#include <atomic>
#include <signal.h>
// A flag set by the SIGINT signal handler.
static volatile std::atomic<bool> stop(false);
// Flag set by the SIGUSR1/2 signal handler.
static volatile std::atomic<bool> reload(false);
// A flag indicating that we are wanting to exit the process. i.e: if this
// flag is set and all connections are closed, we can exit properly.
static bool exiting = false;
/**
* Provide an helpful message to help the user write a minimal working
* configuration file.
*/
int config_help(const std::string& missing_option)
{
if (!missing_option.empty())
std::cerr << "Error: empty value for option " << missing_option << "." << std::endl;
std::cerr <<
"Please provide a configuration file filled like this:\n\n"
"hostname=irc.example.com\npassword=S3CR3T"
<< std::endl;
return 1;
}
static void sigint_handler(int, siginfo_t*, void*)
{
stop.store(true);
}
static void sigusr_handler(int, siginfo_t*, void*)
{
reload.store(true);
}
int main(int ac, char** av)
{
if (ac > 1)
Config::filename = av[1];
Config::file_must_exist = true;
std::cerr << "Using configuration file: " << Config::filename << std::endl;
std::string password;
try { // The file must exist
password = Config::get("password", "");
}
catch (const std::ios::failure& e) {
return config_help("");
}
const std::string hostname = Config::get("hostname", "");
if (password.empty())
return config_help("password");
if (hostname.empty())
return config_help("hostname");
std::shared_ptr<XmppComponent> xmpp_component =
std::make_shared<XmppComponent>(hostname, password);
Poller p;
p.add_socket_handler(xmpp_component);
// Install the signals used to exit the process cleanly, or reload the
// config
sigset_t mask;
sigemptyset(&mask);
struct sigaction on_sigint;
on_sigint.sa_sigaction = &sigint_handler;
on_sigint.sa_mask = mask;
// we want to catch that signal only once.
// Sending SIGINT again will "force" an exit
on_sigint.sa_flags = SA_RESETHAND;
sigaction(SIGINT, &on_sigint, nullptr);
sigaction(SIGTERM, &on_sigint, nullptr);
// Install a signal to reload the config on SIGUSR1/2
struct sigaction on_sigusr;
on_sigusr.sa_sigaction = &sigusr_handler;
on_sigusr.sa_mask = mask;
on_sigusr.sa_flags = 0;
sigaction(SIGUSR1, &on_sigusr, nullptr);
sigaction(SIGUSR2, &on_sigusr, nullptr);
xmpp_component->start();
const std::chrono::milliseconds timeout(-1);
while (p.poll(timeout) != -1)
{
// Check for empty irc_clients (not connected, or with no joined
// channel) and remove them
xmpp_component->clean();
if (stop)
{
log_info("Signal received, exiting...");
exiting = true;
stop.store(false);
xmpp_component->shutdown();
}
if (reload)
{
// Closing the config will just force it to be reopened the next time
// a configuration option is needed
log_info("Signal received, reloading the config...");
Config::close();
// Destroy the logger instance, to be recreated the next time a log
// line needs to be written
Logger::instance().reset();
reload.store(false);
}
// Reconnect to the XMPP server if this was not intended. This may have
// happened because we sent something invalid to it and it decided to
// close the connection. This is a bug that should be fixed, but we
// still reconnect automatically instead of dropping everything
if (!exiting && xmpp_component->ever_auth &&
!xmpp_component->is_connected() &&
!xmpp_component->is_connecting())
{
xmpp_component->reset();
p.add_socket_handler(xmpp_component);
xmpp_component->start();
}
// If the only existing connection is the one to the XMPP component:
// close the XMPP stream.
if (exiting && xmpp_component->is_connecting())
xmpp_component->close();
if (exiting && p.size() == 1 && xmpp_component->is_document_open())
xmpp_component->close_document();
}
log_info("All connection cleanely closed, have a nice day.");
return 0;
}
|
