Mercurial > hg > nginx
annotate src/os/win32/ngx_event_log.c @ 9299:2706b60dc225 default tip
Core: error logging rate limiting.
With this change, error logging to files can be rate-limited with
the "rate=" parameter. The parameter specifies allowed log messages
rate to a particular file (per worker), in messages per second (m/s).
By default, "rate=1000m/s" is used.
Rate limiting is implemented using the "leaky bucket" method, similarly
to the limit_req module.
Maximum burst size is set to the number of log messages per second
for each severity level, so "error" messages are logged even if the
rate limit is hit by "info" messages (but not vice versa). When the
limit is reached for a particular level, the "too many log messages,
limiting" message is logged at this level.
If debug logging is enabled, either for the particular log file or for
the particular connection, rate limiting is not used.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 25 Jun 2024 22:58:56 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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2725 | 1 /* |
2 * Copyright (C) Igor Sysoev | |
4412 | 3 * Copyright (C) Nginx, Inc. |
2725 | 4 */ |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 #define NGX_MAX_ERROR_STR 2048 | |
12 | |
13 | |
14 void ngx_cdecl | |
15 ngx_event_log(ngx_err_t err, const char *fmt, ...) | |
16 { | |
17 u_char *p, *last; | |
18 long types; | |
19 HKEY key; | |
20 HANDLE ev; | |
21 va_list args; | |
22 u_char text[NGX_MAX_ERROR_STR]; | |
23 const char *msgarg[9]; | |
24 static u_char netmsg[] = "%SystemRoot%\\System32\\netmsg.dll"; | |
25 | |
2764
d4a717592877
use ngx_vslprintf(), ngx_slprintf()
Igor Sysoev <igor@sysoev.ru>
parents:
2725
diff
changeset
|
26 last = text + NGX_MAX_ERROR_STR; |
2725 | 27 p = text + GetModuleFileName(NULL, (char *) text, NGX_MAX_ERROR_STR - 50); |
28 | |
29 *p++ = ':'; | |
30 ngx_linefeed(p); | |
31 | |
32 va_start(args, fmt); | |
2764
d4a717592877
use ngx_vslprintf(), ngx_slprintf()
Igor Sysoev <igor@sysoev.ru>
parents:
2725
diff
changeset
|
33 p = ngx_vslprintf(p, last, fmt, args); |
2725 | 34 va_end(args); |
35 | |
36 if (err) { | |
2765 | 37 p = ngx_log_errno(p, last, err); |
2725 | 38 } |
39 | |
40 if (p > last - NGX_LINEFEED_SIZE - 1) { | |
41 p = last - NGX_LINEFEED_SIZE - 1; | |
42 } | |
43 | |
44 ngx_linefeed(p); | |
45 | |
46 *p = '\0'; | |
47 | |
48 /* | |
49 * we do not log errors here since we use | |
50 * Event Log only to log our own logs open errors | |
51 */ | |
52 | |
53 if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, | |
54 "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\nginx", | |
55 0, NULL, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, NULL, &key, NULL) | |
56 != 0) | |
57 { | |
58 return; | |
59 } | |
60 | |
61 if (RegSetValueEx(key, "EventMessageFile", 0, REG_EXPAND_SZ, | |
62 netmsg, sizeof(netmsg) - 1) | |
63 != 0) | |
64 { | |
65 return; | |
66 } | |
67 | |
68 types = EVENTLOG_ERROR_TYPE; | |
69 | |
70 if (RegSetValueEx(key, "TypesSupported", 0, REG_DWORD, | |
71 (u_char *) &types, sizeof(long)) | |
72 != 0) | |
73 { | |
74 return; | |
75 } | |
76 | |
77 RegCloseKey(key); | |
78 | |
79 ev = RegisterEventSource(NULL, "nginx"); | |
80 | |
81 msgarg[0] = (char *) text; | |
82 msgarg[1] = NULL; | |
83 msgarg[2] = NULL; | |
84 msgarg[3] = NULL; | |
85 msgarg[4] = NULL; | |
86 msgarg[5] = NULL; | |
87 msgarg[6] = NULL; | |
88 msgarg[7] = NULL; | |
89 msgarg[8] = NULL; | |
90 | |
91 /* | |
92 * the 3299 event id in netmsg.dll has the generic message format: | |
93 * "%1 %2 %3 %4 %5 %6 %7 %8 %9" | |
94 */ | |
95 | |
96 ReportEvent(ev, EVENTLOG_ERROR_TYPE, 0, 3299, NULL, 9, 0, msgarg, NULL); | |
97 | |
98 DeregisterEventSource(ev); | |
99 } |