Line data    Source code

       1             : // Copyright (c) 2016-2018 The Bitcoin Core 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 BITCOIN_SUPPORT_EVENTS_H
       6             : #define BITCOIN_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           0 : MAKE_RAII(event_base);
      25             : MAKE_RAII(event);
      26           0 : MAKE_RAII(evhttp);
      27             : MAKE_RAII(evhttp_request);
      28             : MAKE_RAII(evhttp_connection);
      29             : 
      30           0 : inline raii_event_base obtain_event_base() {
      31           0 :     auto result = raii_event_base(event_base_new());
      32           0 :     if (!result.get())
      33           0 :         throw std::runtime_error("cannot create event_base");
      34           0 :     return result;
      35           0 : }
      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           0 : inline raii_evhttp obtain_evhttp(struct event_base* base) {
      42           0 :     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 // BITCOIN_SUPPORT_EVENTS_H