Mercurial > hg > nginx-quic
annotate src/http/ngx_http_cache.h @ 5441:43ccaf8e8728
Upstream: cache revalidation with conditional requests.
The following new directives are introduced: proxy_cache_revalidate,
fastcgi_cache_revalidate, scgi_cache_revalidate, uwsgi_cache_revalidate.
Default is off. When set to on, they enable cache revalidation using
conditional requests with If-Modified-Since for expired cache items.
As of now, no attempts are made to merge headers given in a 304 response
during cache revalidation with headers previously stored in a cache item.
Headers in a 304 response are only used to calculate new validity time
of a cache item.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 18 Nov 2013 20:48:22 +0400 |
parents | d620f497c50f |
children | 2fe1967f8854 |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_ |
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9 #define _NGX_HTTP_CACHE_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_http.h> |
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2952 | 17 #define NGX_HTTP_CACHE_MISS 1 |
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18 #define NGX_HTTP_CACHE_BYPASS 2 |
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19 #define NGX_HTTP_CACHE_EXPIRED 3 |
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20 #define NGX_HTTP_CACHE_STALE 4 |
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21 #define NGX_HTTP_CACHE_UPDATING 5 |
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22 #define NGX_HTTP_CACHE_REVALIDATED 6 |
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23 #define NGX_HTTP_CACHE_HIT 7 |
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24 #define NGX_HTTP_CACHE_SCARCE 8 |
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25 |
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26 #define NGX_HTTP_CACHE_KEY_LEN 16 |
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29 typedef struct { |
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30 ngx_uint_t status; |
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31 time_t valid; |
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32 } ngx_http_cache_valid_t; |
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33 |
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34 |
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35 typedef struct { |
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36 ngx_rbtree_node_t node; |
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37 ngx_queue_t queue; |
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38 |
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39 u_char key[NGX_HTTP_CACHE_KEY_LEN |
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40 - sizeof(ngx_rbtree_key_t)]; |
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41 |
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42 unsigned count:20; |
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43 unsigned uses:10; |
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44 unsigned valid_msec:10; |
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45 unsigned error:10; |
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46 unsigned exists:1; |
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47 unsigned updating:1; |
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48 unsigned deleting:1; |
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49 /* 11 unused bits */ |
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50 |
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51 ngx_file_uniq_t uniq; |
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52 time_t expire; |
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53 time_t valid_sec; |
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54 size_t body_start; |
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55 off_t fs_size; |
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56 } ngx_http_file_cache_node_t; |
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57 |
469 | 58 |
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59 struct ngx_http_cache_s { |
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60 ngx_file_t file; |
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61 ngx_array_t keys; |
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62 uint32_t crc32; |
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63 u_char key[NGX_HTTP_CACHE_KEY_LEN]; |
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64 |
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65 ngx_file_uniq_t uniq; |
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66 time_t valid_sec; |
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67 time_t last_modified; |
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68 time_t date; |
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69 |
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70 size_t header_start; |
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71 size_t body_start; |
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72 off_t length; |
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73 off_t fs_size; |
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74 |
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75 ngx_uint_t min_uses; |
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76 ngx_uint_t error; |
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77 ngx_uint_t valid_msec; |
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78 |
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79 ngx_buf_t *buf; |
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80 |
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81 ngx_http_file_cache_t *file_cache; |
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82 ngx_http_file_cache_node_t *node; |
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83 |
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84 ngx_msec_t lock_timeout; |
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85 ngx_msec_t wait_time; |
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86 |
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87 ngx_event_t wait_event; |
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88 |
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89 unsigned lock:1; |
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90 unsigned waiting:1; |
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91 |
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92 unsigned updated:1; |
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93 unsigned updating:1; |
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94 unsigned exists:1; |
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95 unsigned temp_file:1; |
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96 }; |
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97 |
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98 |
473 | 99 typedef struct { |
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100 time_t valid_sec; |
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101 time_t last_modified; |
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102 time_t date; |
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103 uint32_t crc32; |
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104 u_short valid_msec; |
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105 u_short header_start; |
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106 u_short body_start; |
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107 } ngx_http_file_cache_header_t; |
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109 | |
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110 typedef struct { |
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111 ngx_rbtree_t rbtree; |
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112 ngx_rbtree_node_t sentinel; |
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113 ngx_queue_t queue; |
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114 ngx_atomic_t cold; |
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116 off_t size; |
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117 } ngx_http_file_cache_sh_t; |
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118 |
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119 |
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120 struct ngx_http_file_cache_s { |
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121 ngx_http_file_cache_sh_t *sh; |
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122 ngx_slab_pool_t *shpool; |
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124 ngx_path_t *path; |
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125 |
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126 off_t max_size; |
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127 size_t bsize; |
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128 |
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129 time_t inactive; |
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130 |
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131 ngx_uint_t files; |
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132 ngx_uint_t loader_files; |
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133 ngx_msec_t last; |
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134 ngx_msec_t loader_sleep; |
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135 ngx_msec_t loader_threshold; |
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136 |
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137 ngx_shm_zone_t *shm_zone; |
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138 }; |
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139 |
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140 |
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141 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r); |
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142 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r); |
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143 void ngx_http_file_cache_create_key(ngx_http_request_t *r); |
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144 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r); |
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145 void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf); |
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146 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf); |
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147 void ngx_http_file_cache_update_header(ngx_http_request_t *r); |
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148 ngx_int_t ngx_http_cache_send(ngx_http_request_t *); |
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149 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf); |
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150 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status); |
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151 |
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152 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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153 void *conf); |
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154 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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155 void *conf); |
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157 |
2952 | 158 extern ngx_str_t ngx_http_cache_status[]; |
159 | |
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160 |
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161 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */ |