events.h raw

   1  // Copyright (c) 2016-2018 The Limenka developers
   2  // Distributed under the MIT software license, see the accompanying
   3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4  
   5  #ifndef LIMENKA_SUPPORT_EVENTS_H
   6  #define LIMENKA_SUPPORT_EVENTS_H
   7  
   8  #include <ios>
   9  #include <memory>
  10  
  11  #include <event2/event.h>
  12  #include <event2/http.h>
  13  
  14  #define MAKE_RAII(type) \
  15  /* deleter */\
  16  struct type##_deleter {\
  17      void operator()(struct type* ob) {\
  18          type##_free(ob);\
  19      }\
  20  };\
  21  /* unique ptr typedef */\
  22  typedef std::unique_ptr<struct type, type##_deleter> raii_##type
  23  
  24  MAKE_RAII(event_base);
  25  MAKE_RAII(event);
  26  MAKE_RAII(evhttp);
  27  MAKE_RAII(evhttp_request);
  28  MAKE_RAII(evhttp_connection);
  29  
  30  inline raii_event_base obtain_event_base() {
  31      auto result = raii_event_base(event_base_new());
  32      if (!result.get())
  33          throw std::runtime_error("cannot create event_base");
  34      return result;
  35  }
  36  
  37  inline raii_event obtain_event(struct event_base* base, evutil_socket_t s, short events, event_callback_fn cb, void* arg) {
  38      return raii_event(event_new(base, s, events, cb, arg));
  39  }
  40  
  41  inline raii_evhttp obtain_evhttp(struct event_base* base) {
  42      return raii_evhttp(evhttp_new(base));
  43  }
  44  
  45  inline raii_evhttp_request obtain_evhttp_request(void(*cb)(struct evhttp_request *, void *), void *arg) {
  46      return raii_evhttp_request(evhttp_request_new(cb, arg));
  47  }
  48  
  49  inline raii_evhttp_connection obtain_evhttp_connection_base(struct event_base* base, std::string host, uint16_t port) {
  50      auto result = raii_evhttp_connection(evhttp_connection_base_new(base, nullptr, host.c_str(), port));
  51      if (!result.get())
  52          throw std::runtime_error("create connection failed");
  53      return result;
  54  }
  55  
  56  #endif // LIMENKA_SUPPORT_EVENTS_H
  57