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annotate src/http/ngx_http_cache.h @ 2592:3a8a53c0c42f

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a prelimiary proxy cache support
author Igor Sysoev <igor@sysoev.ru>
date Mon, 23 Mar 2009 13:14:51 +0000
parents ad1e9ebf93bb
children d19979e0d980
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_
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8 #define _NGX_HTTP_CACHE_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_http.h>
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16 /**/
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17 #define NGX_HTTP_CACHE_STALE 1
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18 #define NGX_HTTP_CACHE_AGED 2
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19 #define NGX_HTTP_CACHE_THE_SAME 3
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20 /**/
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22 #define NGX_HTTP_CACHE_KEY_LEN 16
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25 typedef struct {
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26 ngx_uint_t status;
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27 time_t valid;
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28 } ngx_http_cache_valid_t;
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29
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30
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31 /* ngx_http_file_cache_node_t takes exactly 64 bytes on FreeBSD/i386 */
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32
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33 typedef struct {
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34 ngx_rbtree_node_t node;
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35 ngx_queue_t queue;
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36
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37 u_char key[NGX_HTTP_CACHE_KEY_LEN
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38 - sizeof(ngx_rbtree_key_t)];
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39
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40 unsigned count:20;
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41 unsigned uses:10;
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42 unsigned valid_msec:10;
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43 unsigned error:10;
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44 /* 7 unused bits */
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45 unsigned exists:1;
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46
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47 ngx_file_uniq_t uniq;
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48 time_t expire;
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49 time_t valid_sec;
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50 size_t body_start;
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51 } ngx_http_file_cache_node_t;
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52
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53
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54 struct ngx_http_cache_s {
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55 ngx_file_t file;
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56 ngx_array_t keys;
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57 uint32_t crc32;
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58 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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59
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60 ngx_file_uniq_t uniq;
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61 time_t valid_sec;
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62 time_t last_modified;
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63 time_t date;
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64
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65 size_t header_start;
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66 size_t body_start;
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67 off_t length;
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68
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69 ngx_uint_t min_uses;
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70 ngx_uint_t uses;
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71 ngx_uint_t error;
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72 ngx_uint_t valid_msec;
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73
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74 ngx_buf_t *buf;
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75
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76 ngx_http_file_cache_t *file_cache;
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77 ngx_http_file_cache_node_t *node;
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78
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79 unsigned updated:1;
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80 unsigned exists:1;
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81 unsigned temp_file:1;
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82 };
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84
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85 typedef struct {
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86 time_t valid_sec;
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87 time_t last_modified;
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88 time_t date;
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89 uint32_t crc32;
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90 u_short valid_msec;
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91 u_short header_start;
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92 u_short body_start;
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93 } ngx_http_file_cache_header_t;
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96 struct ngx_http_file_cache_s {
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97 ngx_rbtree_t *rbtree;
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98 ngx_queue_t *queue;
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99 ngx_slab_pool_t *shpool;
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100
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101 ngx_path_t *path;
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102
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103 time_t inactive;
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104 time_t created;
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105 time_t clean_time;
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106 time_t next_clean_time;
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107
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108 ngx_shm_zone_t *shm_zone;
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109 };
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110
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112 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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113 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
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114 void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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115 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
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116 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
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117 void ngx_http_file_cache_free(ngx_http_request_t *r, ngx_temp_file_t *tf);
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118 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
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119
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120
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121 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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122 void *conf);
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123 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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124 void *conf);
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127 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */