1 //
2 // Copyright(c) 2015 Gabi Melman.
3 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
4 //
5 
6 #pragma once
7 
8 #include "spdlog/sinks/base_sink.h"
9 #include "spdlog/spdlog.h"
10 
11 #include <array>
12 #include <string>
13 #include <syslog.h>
14 
15 namespace spdlog {
16 namespace sinks {
17 /**
18  * Sink that write to syslog using the `syscall()` library call.
19  *
20  * Locking is not needed, as `syslog()` itself is thread-safe.
21  */
22 template<typename Mutex>
23 class syslog_sink : public base_sink<Mutex>
24 {
25 public:
26     //
syslog_sink(std::string ident = �, int syslog_option = 0, int syslog_facility = LOG_USER)27     explicit syslog_sink(std::string ident = "", int syslog_option = 0, int syslog_facility = LOG_USER)
28         : ident_(std::move(ident))
29     {
30         priorities_[static_cast<size_t>(level::trace)] = LOG_DEBUG;
31         priorities_[static_cast<size_t>(level::debug)] = LOG_DEBUG;
32         priorities_[static_cast<size_t>(level::info)] = LOG_INFO;
33         priorities_[static_cast<size_t>(level::warn)] = LOG_WARNING;
34         priorities_[static_cast<size_t>(level::err)] = LOG_ERR;
35         priorities_[static_cast<size_t>(level::critical)] = LOG_CRIT;
36         priorities_[static_cast<size_t>(level::off)] = LOG_INFO;
37 
38         // set ident to be program name if empty
39         ::openlog(ident_.empty() ? nullptr : ident_.c_str(), syslog_option, syslog_facility);
40     }
41 
42     ~syslog_sink() override
43     {
44         ::closelog();
45     }
46 
47     syslog_sink(const syslog_sink &) = delete;
48     syslog_sink &operator=(const syslog_sink &) = delete;
49 
50 protected:
51     void sink_it_(const details::log_msg &msg) override
52     {
53         ::syslog(syslog_prio_from_level(msg), "%s", fmt::to_string(msg.raw).c_str());
54     }
55 
56     void flush_() override {}
57 
58 private:
59     std::array<int, 7> priorities_;
60     // must store the ident because the man says openlog might use the pointer as
61     // is and not a string copy
62     const std::string ident_;
63 
64     //
65     // Simply maps spdlog's log level to syslog priority level.
66     //
syslog_prio_from_level(const details::log_msg &msg) const67     int syslog_prio_from_level(const details::log_msg &msg) const
68     {
69         return priorities_[static_cast<size_t>(msg.level)];
70     }
71 };
72 
73 using syslog_sink_mt = syslog_sink<std::mutex>;
74 using syslog_sink_st = syslog_sink<details::null_mutex>;
75 } // namespace sinks
76 
77 // Create and register a syslog logger
78 template<typename Factory = default_factory>
syslog_logger_mt( const std::string &logger_name, const std::string &syslog_ident = �, int syslog_option = 0, int syslog_facility = (1 << 3))79 inline std::shared_ptr<logger> syslog_logger_mt(
80     const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0, int syslog_facility = (1 << 3))
81 {
82     return Factory::template create<sinks::syslog_sink_mt>(logger_name, syslog_ident, syslog_option, syslog_facility);
83 }
84 
85 template<typename Factory = default_factory>
syslog_logger_st( const std::string &logger_name, const std::string &syslog_ident = �, int syslog_option = 0, int syslog_facility = (1 << 3))86 inline std::shared_ptr<logger> syslog_logger_st(
87     const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0, int syslog_facility = (1 << 3))
88 {
89     return Factory::template create<sinks::syslog_sink_st>(logger_name, syslog_ident, syslog_option, syslog_facility);
90 }
91 } // namespace spdlog
92