1 bcf3fb81 2023-08-16 continue /** Errors handling */
 2 bcf3fb81 2023-08-16 continue 
 3 bcf3fb81 2023-08-16 continue #include <errno.h>
 4 bcf3fb81 2023-08-16 continue #include <string.h>
 5 bcf3fb81 2023-08-16 continue #include <ostream>
 6 bcf3fb81 2023-08-16 continue 
 7 bcf3fb81 2023-08-16 continue #pragma once
 8 bcf3fb81 2023-08-16 continue 
 9 bcf3fb81 2023-08-16 continue 
10 bcf3fb81 2023-08-16 continue namespace vostok
11 bcf3fb81 2023-08-16 continue {
12 bcf3fb81 2023-08-16 continue namespace error
13 bcf3fb81 2023-08-16 continue {
14 bcf3fb81 2023-08-16 continue 
15 bcf3fb81 2023-08-16 continue 
16 bcf3fb81 2023-08-16 continue /** Current output log stream (`std::err` on starup) */
17 bcf3fb81 2023-08-16 continue extern std::ostream &g_log;
18 bcf3fb81 2023-08-16 continue 
19 bcf3fb81 2023-08-16 continue 
20 bcf3fb81 2023-08-16 continue /** Default error code (errno) printer */
21 d6e3180e 2023-08-30 continue class Print
22 bcf3fb81 2023-08-16 continue {
23 d6e3180e 2023-08-30 continue public:
24 d6e3180e 2023-08-30 continue     explicit Print(int error=errno) : m_error{error} {}
25 bcf3fb81 2023-08-16 continue     void operator() () const
26 bcf3fb81 2023-08-16 continue     {
27 2f4289de 2023-08-30 continue         g_log << "Error code (" << std::dec << m_error << "): " << strerror(m_error);
28 bcf3fb81 2023-08-16 continue     }
29 d6e3180e 2023-08-30 continue 
30 d6e3180e 2023-08-30 continue private:
31 d6e3180e 2023-08-30 continue     const int m_error;
32 bcf3fb81 2023-08-16 continue };
33 bcf3fb81 2023-08-16 continue 
34 bcf3fb81 2023-08-16 continue 
35 bcf3fb81 2023-08-16 continue /** Empty error code printer */
36 d6e3180e 2023-08-30 continue class None
37 bcf3fb81 2023-08-16 continue {
38 d6e3180e 2023-08-30 continue public:
39 bcf3fb81 2023-08-16 continue     void operator() () const {}
40 bcf3fb81 2023-08-16 continue };
41 bcf3fb81 2023-08-16 continue 
42 bcf3fb81 2023-08-16 continue 
43 bcf3fb81 2023-08-16 continue /** Error handler: print action, print error */
44 bcf3fb81 2023-08-16 continue template<
45 d6e3180e 2023-08-30 continue     typename PrintAction,
46 d6e3180e 2023-08-30 continue     typename PrintError
47 bcf3fb81 2023-08-16 continue >
48 bcf3fb81 2023-08-16 continue void
49 bcf3fb81 2023-08-16 continue occurred(
50 d6e3180e 2023-08-30 continue     PrintAction print_action,
51 d6e3180e 2023-08-30 continue     PrintError print_error
52 bcf3fb81 2023-08-16 continue )
53 bcf3fb81 2023-08-16 continue {
54 bcf3fb81 2023-08-16 continue     print_action();
55 2f4289de 2023-08-30 continue     g_log << " failed. ";
56 bcf3fb81 2023-08-16 continue     print_error();
57 2f4289de 2023-08-30 continue     g_log << std::endl;
58 bcf3fb81 2023-08-16 continue }
59 bcf3fb81 2023-08-16 continue 
60 bcf3fb81 2023-08-16 continue template<typename TPrintError>
61 bcf3fb81 2023-08-16 continue void
62 bcf3fb81 2023-08-16 continue occurred(
63 bcf3fb81 2023-08-16 continue     const char *action,
64 bcf3fb81 2023-08-16 continue     TPrintError print_error
65 bcf3fb81 2023-08-16 continue )
66 bcf3fb81 2023-08-16 continue {
67 bcf3fb81 2023-08-16 continue     occurred(
68 bcf3fb81 2023-08-16 continue         [action]
69 bcf3fb81 2023-08-16 continue         {
70 bcf3fb81 2023-08-16 continue             g_log << action;
71 bcf3fb81 2023-08-16 continue         },
72 bcf3fb81 2023-08-16 continue         print_error
73 bcf3fb81 2023-08-16 continue     );
74 bcf3fb81 2023-08-16 continue }
75 bcf3fb81 2023-08-16 continue 
76 bcf3fb81 2023-08-16 continue 
77 bcf3fb81 2023-08-16 continue }   // namespace error
78 bcf3fb81 2023-08-16 continue }   // namespace vostok