Mercurial > hg > nginx
view src/core/ngx_parse.c @ 9299:2706b60dc225
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 | 87cf6ddb41c2 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> ssize_t ngx_parse_size(ngx_str_t *line) { u_char unit; size_t len; ssize_t size, scale, max; len = line->len; if (len == 0) { return NGX_ERROR; } unit = line->data[len - 1]; switch (unit) { case 'K': case 'k': len--; max = NGX_MAX_SIZE_T_VALUE / 1024; scale = 1024; break; case 'M': case 'm': len--; max = NGX_MAX_SIZE_T_VALUE / (1024 * 1024); scale = 1024 * 1024; break; default: max = NGX_MAX_SIZE_T_VALUE; scale = 1; } size = ngx_atosz(line->data, len); if (size == NGX_ERROR || size > max) { return NGX_ERROR; } size *= scale; return size; } off_t ngx_parse_offset(ngx_str_t *line) { u_char unit; off_t offset, scale, max; size_t len; len = line->len; if (len == 0) { return NGX_ERROR; } unit = line->data[len - 1]; switch (unit) { case 'K': case 'k': len--; max = NGX_MAX_OFF_T_VALUE / 1024; scale = 1024; break; case 'M': case 'm': len--; max = NGX_MAX_OFF_T_VALUE / (1024 * 1024); scale = 1024 * 1024; break; case 'G': case 'g': len--; max = NGX_MAX_OFF_T_VALUE / (1024 * 1024 * 1024); scale = 1024 * 1024 * 1024; break; default: max = NGX_MAX_OFF_T_VALUE; scale = 1; } offset = ngx_atoof(line->data, len); if (offset == NGX_ERROR || offset > max) { return NGX_ERROR; } offset *= scale; return offset; } ngx_int_t ngx_parse_time(ngx_str_t *line, ngx_uint_t is_sec) { u_char *p, *last; ngx_int_t value, total, scale; ngx_int_t max, cutoff, cutlim; ngx_uint_t valid; enum { st_start = 0, st_year, st_month, st_week, st_day, st_hour, st_min, st_sec, st_msec, st_last } step; valid = 0; value = 0; total = 0; cutoff = NGX_MAX_INT_T_VALUE / 10; cutlim = NGX_MAX_INT_T_VALUE % 10; step = is_sec ? st_start : st_month; p = line->data; last = p + line->len; while (p < last) { if (*p >= '0' && *p <= '9') { if (value >= cutoff && (value > cutoff || *p - '0' > cutlim)) { return NGX_ERROR; } value = value * 10 + (*p++ - '0'); valid = 1; continue; } switch (*p++) { case 'y': if (step > st_start) { return NGX_ERROR; } step = st_year; max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 365); scale = 60 * 60 * 24 * 365; break; case 'M': if (step >= st_month) { return NGX_ERROR; } step = st_month; max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 30); scale = 60 * 60 * 24 * 30; break; case 'w': if (step >= st_week) { return NGX_ERROR; } step = st_week; max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 7); scale = 60 * 60 * 24 * 7; break; case 'd': if (step >= st_day) { return NGX_ERROR; } step = st_day; max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24); scale = 60 * 60 * 24; break; case 'h': if (step >= st_hour) { return NGX_ERROR; } step = st_hour; max = NGX_MAX_INT_T_VALUE / (60 * 60); scale = 60 * 60; break; case 'm': if (p < last && *p == 's') { if (is_sec || step >= st_msec) { return NGX_ERROR; } p++; step = st_msec; max = NGX_MAX_INT_T_VALUE; scale = 1; break; } if (step >= st_min) { return NGX_ERROR; } step = st_min; max = NGX_MAX_INT_T_VALUE / 60; scale = 60; break; case 's': if (step >= st_sec) { return NGX_ERROR; } step = st_sec; max = NGX_MAX_INT_T_VALUE; scale = 1; break; case ' ': if (step >= st_sec) { return NGX_ERROR; } step = st_last; max = NGX_MAX_INT_T_VALUE; scale = 1; break; default: return NGX_ERROR; } if (step != st_msec && !is_sec) { scale *= 1000; max /= 1000; } if (value > max) { return NGX_ERROR; } value *= scale; if (total > NGX_MAX_INT_T_VALUE - value) { return NGX_ERROR; } total += value; value = 0; while (p < last && *p == ' ') { p++; } } if (!valid) { return NGX_ERROR; } if (!is_sec) { if (value > NGX_MAX_INT_T_VALUE / 1000) { return NGX_ERROR; } value *= 1000; } if (total > NGX_MAX_INT_T_VALUE - value) { return NGX_ERROR; } return total + value; }