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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>
date Tue, 25 Jun 2024 22:58:56 +0300
parents 512c741fa841
children
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_SHMTX_H_INCLUDED_
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9 #define _NGX_SHMTX_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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16 typedef struct {
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17 ngx_atomic_t lock;
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18 #if (NGX_HAVE_POSIX_SEM)
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19 ngx_atomic_t wait;
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20 #endif
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21 } ngx_shmtx_sh_t;
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24 typedef struct {
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25 #if (NGX_HAVE_ATOMIC_OPS)
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26 ngx_atomic_t *lock;
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27 #if (NGX_HAVE_POSIX_SEM)
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28 ngx_atomic_t *wait;
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29 ngx_uint_t semaphore;
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30 sem_t sem;
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31 #endif
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32 #else
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33 ngx_fd_t fd;
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34 u_char *name;
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35 #endif
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36 ngx_uint_t spin;
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37 } ngx_shmtx_t;
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40 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr,
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41 u_char *name);
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42 void ngx_shmtx_destroy(ngx_shmtx_t *mtx);
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43 ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
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44 void ngx_shmtx_lock(ngx_shmtx_t *mtx);
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45 void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
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46 ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid);
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49 #endif /* _NGX_SHMTX_H_INCLUDED_ */