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annotate src/http/v2/ngx_http_v2_encode.c @ 9299:2706b60dc225 default tip

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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 336084ff943b
children
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 * Copyright (C) Valentin V. Bartenev
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5 */
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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13 static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
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14 ngx_uint_t value);
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17 u_char *
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18 ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
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19 ngx_uint_t lower)
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20 {
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21 size_t hlen;
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22
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23 hlen = ngx_http_huff_encode(src, len, tmp, lower);
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25 if (hlen > 0) {
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26 *dst = NGX_HTTP_V2_ENCODE_HUFF;
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27 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
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28 return ngx_cpymem(dst, tmp, hlen);
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29 }
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31 *dst = NGX_HTTP_V2_ENCODE_RAW;
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32 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);
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33
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34 if (lower) {
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35 ngx_strlow(dst, src, len);
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36 return dst + len;
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37 }
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38
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39 return ngx_cpymem(dst, src, len);
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40 }
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43 static u_char *
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44 ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
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45 {
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46 if (value < prefix) {
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47 *pos++ |= value;
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48 return pos;
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49 }
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51 *pos++ |= prefix;
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52 value -= prefix;
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54 while (value >= 128) {
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55 *pos++ = value % 128 + 128;
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56 value /= 128;
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57 }
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59 *pos++ = (u_char) value;
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61 return pos;
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62 }