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annotate src/core/ngx_syslog.h @ 9299:2706b60dc225

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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 1c9264603adc
children
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777202558122 Added syslog support for error_log and access_log directives.
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 */
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7 #ifndef _NGX_SYSLOG_H_INCLUDED_
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8 #define _NGX_SYSLOG_H_INCLUDED_
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11 typedef struct {
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12 ngx_uint_t facility;
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13 ngx_uint_t severity;
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14 ngx_str_t tag;
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16 ngx_str_t *hostname;
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18 ngx_addr_t server;
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19 ngx_connection_t conn;
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21 ngx_log_t log;
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22 ngx_log_t *logp;
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24 time_t error_log_time;
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25 time_t connect_error_time;
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27 unsigned busy:1;
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28 unsigned nohostname:1;
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29 } ngx_syslog_peer_t;
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32 char *ngx_syslog_process_conf(ngx_conf_t *cf, ngx_syslog_peer_t *peer);
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33 u_char *ngx_syslog_add_header(ngx_syslog_peer_t *peer, u_char *buf);
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34 void ngx_syslog_writer(ngx_log_t *log, ngx_uint_t level, u_char *buf,
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35 size_t len);
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36 ssize_t ngx_syslog_send(ngx_syslog_peer_t *peer, u_char *buf, size_t len);
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39 #endif /* _NGX_SYSLOG_H_INCLUDED_ */