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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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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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9
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10
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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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14
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15
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16 /*
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17 * The 7 uses before an allocation.
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18 * We can use maximum 7 bits, i.e up to the 127 uses.
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19 */
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20 #define NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS 3
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21
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22 typedef struct {
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23 uint32_t crc;
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24 ngx_str_t key;
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25 time_t accessed;
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26
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27 unsigned refs:20; /* 1048576 references */
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28
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29 unsigned count:NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS;
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30
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31 unsigned deleted:1;
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32 unsigned expired:1;
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33 unsigned memory:1;
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34 unsigned mmap:1;
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35 unsigned notify:1;
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36
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37 ngx_fd_t fd;
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38 #if (NGX_USE_HTTP_FILE_CACHE_UNIQ)
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39 ngx_file_uniq_t uniq; /* no needed with kqueue */
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40 #endif
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41 time_t last_modified;
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42 time_t updated;
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43
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44 union {
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45 off_t size;
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46 ngx_str_t value;
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47 } data;
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48 } ngx_http_cache_t;
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49
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50
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51 typedef struct {
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52 time_t expires;
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53 time_t last_modified;
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54 time_t date;
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55 off_t length;
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56 size_t key_len;
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57 char key[1];
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58 } ngx_http_cache_header_t;
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59
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60
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61 #define NGX_HTTP_CACHE_HASH 7
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62 #define NGX_HTTP_CACHE_NELTS 4
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63
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64 typedef struct {
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65 ngx_http_cache_t *elts;
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66 size_t hash;
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67 size_t nelts;
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68 time_t life;
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69 time_t update;
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70 #if (NGX_THREADS)
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71 ngx_mutex_t mutex;
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72 #endif
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73 ngx_pool_t *pool;
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74 } ngx_http_cache_hash_t;
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75
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76
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77 typedef struct {
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78 ngx_http_cache_hash_t *hash;
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79 ngx_http_cache_t *cache;
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80 ngx_file_t file;
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81 ngx_str_t key;
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82 uint32_t crc;
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83 u_char md5[16];
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84 ngx_path_t *path;
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85 ngx_buf_t *buf;
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86 time_t expires;
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87 time_t last_modified;
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88 time_t date;
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89 off_t length;
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90 ssize_t header_size;
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91 size_t file_start;
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92 ngx_log_t *log;
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93 } ngx_http_cache_ctx_t;
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94
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95
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96
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97 #define NGX_HTTP_CACHE_STALE 1
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98 #define NGX_HTTP_CACHE_AGED 2
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99 #define NGX_HTTP_CACHE_THE_SAME 3
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100
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101
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102 ngx_http_cache_t *ngx_http_cache_get(ngx_http_cache_hash_t *cache,
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103 ngx_http_cleanup_t *cleanup,
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104 ngx_str_t *key, uint32_t *crc);
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105
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106 ngx_http_cache_t *ngx_http_cache_alloc(ngx_http_cache_hash_t *hash,
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107 ngx_http_cache_t *cache,
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108 ngx_http_cleanup_t *cleanup,
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109 ngx_str_t *key, uint32_t crc,
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110 ngx_str_t *value, ngx_log_t *log);
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111 void ngx_http_cache_free(ngx_http_cache_t *cache,
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112 ngx_str_t *key, ngx_str_t *value, ngx_log_t *log);
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113 void ngx_http_cache_lock(ngx_http_cache_hash_t *hash, ngx_http_cache_t *cache);
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114 void ngx_http_cache_unlock(ngx_http_cache_hash_t *hash,
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115 ngx_http_cache_t *cache, ngx_log_t *log);
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116
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117 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx);
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118 int ngx_http_cache_open_file(ngx_http_cache_ctx_t *ctx, ngx_file_uniq_t uniq);
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119 int ngx_http_cache_update_file(ngx_http_request_t *r,ngx_http_cache_ctx_t *ctx,
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120 ngx_str_t *temp_file);
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121
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122 int ngx_http_send_cached(ngx_http_request_t *r);
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123
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124
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125 int ngx_garbage_collector_http_cache_handler(ngx_gc_t *gc, ngx_str_t *name,
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126 ngx_dir_t *dir);
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127
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128 char *ngx_http_set_cache_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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129
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130
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131 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */
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