main.cpp 5.9 KB
Newer Older
1
#include <xmpp/biboumi_component.hpp>
2
#include <utils/timed_events.hpp>
3 4
#include <network/poller.hpp>
#include <config/config.hpp>
louiz’'s avatar
louiz’ committed
5
#include <logger/logger.hpp>
louiz’'s avatar
louiz’ committed
6
#include <utils/xdg.hpp>
7
#include <utils/reload.hpp>
louiz’'s avatar
louiz’ committed
8

9 10 11 12
#ifdef CARES_FOUND
# include <network/dns_handler.hpp>
#endif

13 14
#include <atomic>
#include <signal.h>
15

louiz’'s avatar
louiz’ committed
16
// A flag set by the SIGINT signal handler.
louiz’'s avatar
louiz’ committed
17 18 19
static volatile std::atomic<bool> stop(false);
// Flag set by the SIGUSR1/2 signal handler.
static volatile std::atomic<bool> reload(false);
louiz’'s avatar
louiz’ committed
20 21 22
// 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;
23

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
/**
 * 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;
}

39
static void sigint_handler(int sig, siginfo_t*, void*)
louiz’'s avatar
louiz’ committed
40
{
41
  // In 2 seconds, repeat the same signal, to force the exit
42
  TimedEventsManager::instance().add_event(TimedEvent(std::chrono::steady_clock::now() + 2s,
43
                                    [sig]() { raise(sig); }));
44
  stop.store(true);
louiz’'s avatar
louiz’ committed
45 46
}

louiz’'s avatar
louiz’ committed
47 48
static void sigusr_handler(int, siginfo_t*, void*)
{
49
  reload.store(true);
louiz’'s avatar
louiz’ committed
50 51
}

52
int main(int ac, char** av)
louiz’'s avatar
louiz’ committed
53
{
54 55
  const std::string conf_filename = ac > 1 ? av[1] : xdg_config_path("biboumi.cfg");
  std::cerr << "Using configuration file: " << conf_filename << std::endl;
56

57
  if (!Config::read_conf(conf_filename))
58
    return config_help("");
59 60

  const std::string password = Config::get("password", "");
61
  if (password.empty())
62
    return config_help("password");
63
  const std::string hostname = Config::get("hostname", "");
64 65
  if (hostname.empty())
    return config_help("hostname");
66

67 68 69 70 71 72
  try {
      open_database();
    } catch (...) {
      return 1;
    }

73 74 75 76 77 78 79 80 81 82 83
  // Block the signals we want to manage. They will be unblocked only during
  // the epoll_pwait or ppoll calls. This avoids some race conditions,
  // explained in man 2 pselect on linux
  sigset_t mask;
  sigemptyset(&mask);
  sigaddset(&mask, SIGINT);
  sigaddset(&mask, SIGTERM);
  sigaddset(&mask, SIGUSR1);
  sigaddset(&mask, SIGUSR2);
  sigprocmask(SIG_BLOCK, &mask, nullptr);

louiz’'s avatar
louiz’ committed
84 85
  // Install the signals used to exit the process cleanly, or reload the
  // config
louiz’'s avatar
louiz’ committed
86 87
  struct sigaction on_sigint;
  on_sigint.sa_sigaction = &sigint_handler;
88 89
  // All signals must be blocked while a signal handler is running
  sigfillset(&on_sigint.sa_mask);
louiz’'s avatar
louiz’ committed
90 91
  // we want to catch that signal only once.
  // Sending SIGINT again will "force" an exit
louiz’'s avatar
louiz’ committed
92 93 94 95 96 97 98
  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;
99
  sigfillset(&on_sigusr.sa_mask);
louiz’'s avatar
louiz’ committed
100
  on_sigusr.sa_flags = 0;
louiz’'s avatar
louiz’ committed
101 102
  sigaction(SIGUSR1, &on_sigusr, nullptr);
  sigaction(SIGUSR2, &on_sigusr, nullptr);
louiz’'s avatar
louiz’ committed
103

louiz’'s avatar
louiz’ committed
104 105 106
  auto p = std::make_shared<Poller>();
  auto xmpp_component =
    std::make_shared<BiboumiComponent>(p, hostname, password);
107 108
  xmpp_component->start();

109 110 111
#ifdef CARES_FOUND
  DNSHandler::instance.watch_dns_sockets(p);
#endif
112
  auto timeout = TimedEventsManager::instance().get_timeout();
113
  while (p->poll(timeout) != -1)
louiz’'s avatar
louiz’ committed
114
  {
115
    TimedEventsManager::instance().execute_expired_events();
louiz’'s avatar
louiz’ committed
116 117 118
    // Check for empty irc_clients (not connected, or with no joined
    // channel) and remove them
    xmpp_component->clean();
louiz’'s avatar
louiz’ committed
119 120 121
    if (stop)
    {
      log_info("Signal received, exiting...");
122 123 124
#ifdef SYSTEMD_FOUND
      sd_notify(0, "STOPPING=1");
#endif
louiz’'s avatar
louiz’ committed
125
      exiting = true;
126
      stop.store(false);
louiz’'s avatar
louiz’ committed
127
      xmpp_component->shutdown();
louiz’'s avatar
louiz’ committed
128
      // Cancel the timer for a potential reconnection
129
      TimedEventsManager::instance().cancel("XMPP reconnection");
louiz’'s avatar
louiz’ committed
130
    }
louiz’'s avatar
louiz’ committed
131 132 133
    if (reload)
    {
      log_info("Signal received, reloading the config...");
louiz’'s avatar
louiz’ committed
134
      ::reload_process();
135
      reload.store(false);
louiz’'s avatar
louiz’ committed
136
    }
137 138 139 140
    // 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
141 142
    if (!exiting && xmpp_component->ever_auth &&
        !xmpp_component->is_connected() &&
143
        !xmpp_component->is_connecting())
144 145 146
    {
      if (xmpp_component->first_connection_try == true)
      { // immediately re-try to connect
147 148 149
        xmpp_component->reset();
        xmpp_component->start();
      }
150 151 152 153 154 155 156 157 158 159 160 161
      else
      { // Re-connecting failed, we now try only each few seconds
        auto reconnect_later = [xmpp_component]()
        {
          xmpp_component->reset();
          xmpp_component->start();
        };
        TimedEvent event(std::chrono::steady_clock::now() + 2s,
                         reconnect_later, "XMPP reconnection");
        TimedEventsManager::instance().add_event(std::move(event));
      }
    }
louiz’'s avatar
louiz’ committed
162 163
    // If the only existing connection is the one to the XMPP component:
    // close the XMPP stream.
164 165
    if (exiting && xmpp_component->is_connecting())
      xmpp_component->close();
166
    if (exiting && p->size() == 1 && xmpp_component->is_document_open())
louiz’'s avatar
louiz’ committed
167
      xmpp_component->close_document();
168 169 170 171
#ifdef CARES_FOUND
    if (!exiting)
      DNSHandler::instance.watch_dns_sockets(p);
#endif
172 173 174 175
    if (exiting) // If we are exiting, do not wait for any timed event
      timeout = utils::no_timeout;
    else
      timeout = TimedEventsManager::instance().get_timeout();
louiz’'s avatar
louiz’ committed
176
  }
louiz’'s avatar
louiz’ committed
177 178 179
#ifdef CARES_FOUND
  DNSHandler::instance.destroy();
#endif
180 181
  if (!xmpp_component->ever_auth)
    return 1; // To signal that the process did not properly start
louiz’'s avatar
louiz’ committed
182
  log_info("All connections cleanly closed, have a nice day.");
louiz’'s avatar
louiz’ committed
183 184
  return 0;
}