Bitcoin Core  0.19.99
P2P Digital Currency
events.h
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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 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 // BITCOIN_SUPPORT_EVENTS_H
raii_event obtain_event(struct event_base *base, evutil_socket_t s, short events, event_callback_fn cb, void *arg)
Definition: events.h:37
raii_event_base obtain_event_base()
Definition: events.h:30
raii_evhttp obtain_evhttp(struct event_base *base)
Definition: events.h:41
raii_evhttp_request obtain_evhttp_request(void(*cb)(struct evhttp_request *, void *), void *arg)
Definition: events.h:45
#define MAKE_RAII(type)
Definition: events.h:14
raii_evhttp_connection obtain_evhttp_connection_base(struct event_base *base, std::string host, uint16_t port)
Definition: events.h:49