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annotate src/http/ngx_http_cache.h @ 7670:ccb5ff87ab3e

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Cache: introduced min_free cache clearing. Clearing cache based on free space left on a file system is expected to allow better disk utilization in some cases, notably when disk space might be also used for something other than nginx cache (including nginx own temporary files) and while loading cache (when cache size might be inaccurate for a while, effectively disabling max_size cache clearing). Based on a patch by Adam Bambuch.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 22 Jun 2020 18:03:00 +0300
parents 609daeb3b48b
children 847fd35f94de
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_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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16
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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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27 #define NGX_HTTP_CACHE_ETAG_LEN 128
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28 #define NGX_HTTP_CACHE_VARY_LEN 128
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29
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30 #define NGX_HTTP_CACHE_VERSION 5
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33 typedef struct {
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34 ngx_uint_t status;
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35 time_t valid;
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36 } ngx_http_cache_valid_t;
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37
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38
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39 typedef struct {
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40 ngx_rbtree_node_t node;
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41 ngx_queue_t queue;
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42
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43 u_char key[NGX_HTTP_CACHE_KEY_LEN
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44 - sizeof(ngx_rbtree_key_t)];
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45
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46 unsigned count:20;
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47 unsigned uses:10;
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48 unsigned valid_msec:10;
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49 unsigned error:10;
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50 unsigned exists:1;
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51 unsigned updating:1;
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52 unsigned deleting:1;
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53 unsigned purged:1;
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54 /* 10 unused bits */
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55
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56 ngx_file_uniq_t uniq;
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57 time_t expire;
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58 time_t valid_sec;
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59 size_t body_start;
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60 off_t fs_size;
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61 ngx_msec_t lock_time;
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62 } ngx_http_file_cache_node_t;
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63
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64
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65 struct ngx_http_cache_s {
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66 ngx_file_t file;
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67 ngx_array_t keys;
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68 uint32_t crc32;
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69 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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70 u_char main[NGX_HTTP_CACHE_KEY_LEN];
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71
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72 ngx_file_uniq_t uniq;
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73 time_t valid_sec;
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74 time_t updating_sec;
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75 time_t error_sec;
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76 time_t last_modified;
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77 time_t date;
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78
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79 ngx_str_t etag;
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80 ngx_str_t vary;
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81 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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82
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83 size_t header_start;
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84 size_t body_start;
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85 off_t length;
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86 off_t fs_size;
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87
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88 ngx_uint_t min_uses;
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89 ngx_uint_t error;
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90 ngx_uint_t valid_msec;
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91 ngx_uint_t vary_tag;
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92
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93 ngx_buf_t *buf;
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94
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95 ngx_http_file_cache_t *file_cache;
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96 ngx_http_file_cache_node_t *node;
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97
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98 #if (NGX_THREADS || NGX_COMPAT)
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99 ngx_thread_task_t *thread_task;
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100 #endif
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101
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102 ngx_msec_t lock_timeout;
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103 ngx_msec_t lock_age;
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104 ngx_msec_t lock_time;
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105 ngx_msec_t wait_time;
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106
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107 ngx_event_t wait_event;
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108
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109 unsigned lock:1;
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110 unsigned waiting:1;
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111
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112 unsigned updated:1;
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113 unsigned updating:1;
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114 unsigned exists:1;
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115 unsigned temp_file:1;
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116 unsigned purged:1;
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117 unsigned reading:1;
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118 unsigned secondary:1;
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119 unsigned background:1;
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120
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121 unsigned stale_updating:1;
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122 unsigned stale_error:1;
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123 };
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125
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126 typedef struct {
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127 ngx_uint_t version;
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128 time_t valid_sec;
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129 time_t updating_sec;
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130 time_t error_sec;
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131 time_t last_modified;
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132 time_t date;
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133 uint32_t crc32;
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134 u_short valid_msec;
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135 u_short header_start;
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136 u_short body_start;
5737
44b9ab7752e3 Cache: ETag now saved into cache header.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5736
diff changeset
137 u_char etag_len;
44b9ab7752e3 Cache: ETag now saved into cache header.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5736
diff changeset
138 u_char etag[NGX_HTTP_CACHE_ETAG_LEN];
5878
2c89956b6a76 Cache: hash of Vary headers now stored in cache.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5737
diff changeset
139 u_char vary_len;
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Maxim Dounin <mdounin@mdounin.ru>
parents: 5737
diff changeset
140 u_char vary[NGX_HTTP_CACHE_VARY_LEN];
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parents: 5737
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141 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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142 } ngx_http_file_cache_header_t;
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143
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144
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145 typedef struct {
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146 ngx_rbtree_t rbtree;
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147 ngx_rbtree_node_t sentinel;
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148 ngx_queue_t queue;
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diff changeset
149 ngx_atomic_t cold;
3018
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150 ngx_atomic_t loading;
2720
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diff changeset
151 off_t size;
6445
c9d680b00744 Cache: added watermark to reduce IO load when keys_zone is full.
Dmitry Volyntsev <xeioex@nginx.com>
parents: 6444
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152 ngx_uint_t count;
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153 ngx_uint_t watermark;
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154 } ngx_http_file_cache_sh_t;
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155
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diff changeset
156
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diff changeset
157 struct ngx_http_file_cache_s {
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158 ngx_http_file_cache_sh_t *sh;
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diff changeset
159 ngx_slab_pool_t *shpool;
469
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diff changeset
160
2592
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diff changeset
161 ngx_path_t *path;
201
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parents: 200
diff changeset
162
7670
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Maxim Dounin <mdounin@mdounin.ru>
parents: 6908
diff changeset
163 off_t min_free;
2616
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diff changeset
164 off_t max_size;
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diff changeset
165 size_t bsize;
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diff changeset
166
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167 time_t inactive;
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diff changeset
168
6444
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Dmitry Volyntsev <xeioex@nginx.com>
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diff changeset
169 time_t fail_time;
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Dmitry Volyntsev <xeioex@nginx.com>
parents: 6063
diff changeset
170
3974
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diff changeset
171 ngx_uint_t files;
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172 ngx_uint_t loader_files;
2616
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diff changeset
173 ngx_msec_t last;
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diff changeset
174 ngx_msec_t loader_sleep;
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diff changeset
175 ngx_msec_t loader_threshold;
201
267ea1d98683 nginx-0.0.1-2003-11-30-23:03:18 import
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parents: 200
diff changeset
176
6727
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Dmitry Volyntsev <xeioex@nginx.com>
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diff changeset
177 ngx_uint_t manager_files;
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diff changeset
178 ngx_msec_t manager_sleep;
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diff changeset
179 ngx_msec_t manager_threshold;
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diff changeset
180
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diff changeset
181 ngx_shm_zone_t *shm_zone;
6795
1a917932db96 Cache: prefix-based temporary files.
Maxim Dounin <mdounin@mdounin.ru>
parents: 6733
diff changeset
182
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diff changeset
183 ngx_uint_t use_temp_path;
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diff changeset
184 /* unsigned use_temp_path:1 */
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diff changeset
185 };
200
abeaebe0a33c nginx-0.0.1-2003-11-28-20:41:47 import
Igor Sysoev <igor@sysoev.ru>
parents: 199
diff changeset
186
197
0b81c7a0b133 nginx-0.0.1-2003-11-27-10:45:22 import
Igor Sysoev <igor@sysoev.ru>
parents: 195
diff changeset
187
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Igor Sysoev <igor@sysoev.ru>
parents: 3697
diff changeset
188 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r);
3699
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Igor Sysoev <igor@sysoev.ru>
parents: 3698
diff changeset
189 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r);
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diff changeset
190 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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diff changeset
191 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
5959
f7584d7c0ccb Cache: update variant while setting header.
Valentin Bartenev <vbart@nginx.com>
parents: 5905
diff changeset
192 ngx_int_t ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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diff changeset
193 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
5441
43ccaf8e8728 Upstream: cache revalidation with conditional requests.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
194 void ngx_http_file_cache_update_header(ngx_http_request_t *r);
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diff changeset
195 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
3711
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Igor Sysoev <igor@sysoev.ru>
parents: 3699
diff changeset
196 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf);
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diff changeset
197 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
198
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diff changeset
199 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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diff changeset
200 void *conf);
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diff changeset
201 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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diff changeset
202 void *conf);
469
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Igor Sysoev <igor@sysoev.ru>
parents: 444
diff changeset
203
3526
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Igor Sysoev <igor@sysoev.ru>
parents: 3052
diff changeset
204
2952
0998606fbfd4 $upstream_cache_status
Igor Sysoev <igor@sysoev.ru>
parents: 2927
diff changeset
205 extern ngx_str_t ngx_http_cache_status[];
0998606fbfd4 $upstream_cache_status
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diff changeset
206
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
207
170
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
208 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */