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/*
* Copyright (C) Igor Sysoev
*/
#ifndef _NGX_HTTP_CACHE_H_INCLUDED_
#define _NGX_HTTP_CACHE_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
/*
* The 7 uses before an allocation.
* We can use maximum 7 bits, i.e up to the 127 uses.
*/
#define NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS 3
typedef struct {
uint32_t crc;
ngx_str_t key;
time_t accessed;
unsigned refs:20; /* 1048576 references */
unsigned count:NGX_HTTP_CACHE_LAZY_ALLOCATION_BITS;
unsigned deleted:1;
unsigned expired:1;
unsigned memory:1;
unsigned mmap:1;
unsigned notify:1;
ngx_fd_t fd;
#if (NGX_USE_HTTP_FILE_CACHE_UNIQ)
ngx_file_uniq_t uniq; /* no needed with kqueue */
#endif
time_t last_modified;
time_t updated;
union {
off_t size;
ngx_str_t value;
} data;
} ngx_http_cache_t;
typedef struct {
time_t expires;
time_t last_modified;
time_t date;
off_t length;
size_t key_len;
char key[1];
} ngx_http_cache_header_t;
#define NGX_HTTP_CACHE_HASH 7
#define NGX_HTTP_CACHE_NELTS 4
typedef struct {
ngx_http_cache_t *elts;
size_t hash;
size_t nelts;
time_t life;
time_t update;
#if (NGX_THREADS)
ngx_mutex_t mutex;
#endif
ngx_pool_t *pool;
} ngx_http_cache_hash_t;
typedef struct {
ngx_http_cache_hash_t *hash;
ngx_http_cache_t *cache;
ngx_file_t file;
ngx_str_t key;
uint32_t crc;
u_char md5[16];
ngx_path_t *path;
ngx_buf_t *buf;
time_t expires;
time_t last_modified;
time_t date;
off_t length;
ssize_t header_size;
size_t file_start;
ngx_log_t *log;
} ngx_http_cache_ctx_t;
#define NGX_HTTP_CACHE_STALE 1
#define NGX_HTTP_CACHE_AGED 2
#define NGX_HTTP_CACHE_THE_SAME 3
ngx_http_cache_t *ngx_http_cache_get(ngx_http_cache_hash_t *cache,
ngx_http_cleanup_t *cleanup,
ngx_str_t *key, uint32_t *crc);
ngx_http_cache_t *ngx_http_cache_alloc(ngx_http_cache_hash_t *hash,
ngx_http_cache_t *cache,
ngx_http_cleanup_t *cleanup,
ngx_str_t *key, uint32_t crc,
ngx_str_t *value, ngx_log_t *log);
void ngx_http_cache_free(ngx_http_cache_t *cache,
ngx_str_t *key, ngx_str_t *value, ngx_log_t *log);
void ngx_http_cache_lock(ngx_http_cache_hash_t *hash, ngx_http_cache_t *cache);
void ngx_http_cache_unlock(ngx_http_cache_hash_t *hash,
ngx_http_cache_t *cache, ngx_log_t *log);
int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx);
int ngx_http_cache_open_file(ngx_http_cache_ctx_t *ctx, ngx_file_uniq_t uniq);
int ngx_http_cache_update_file(ngx_http_request_t *r,ngx_http_cache_ctx_t *ctx,
ngx_str_t *temp_file);
int ngx_http_send_cached(ngx_http_request_t *r);
int ngx_garbage_collector_http_cache_handler(ngx_gc_t *gc, ngx_str_t *name,
ngx_dir_t *dir);
char *ngx_http_set_cache_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
#endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */
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