Mercurial > hg > nginx-ranges
view src/http/ngx_http_cache.h @ 391:1d9bef53cd8e
Range filter: late_ranges functionality.
Add one more filtering point after postpone filter. This allows to serve
range capable replies with subrequests. It's not as efficient as range
filtering for static data (i.e. doesn't save us from reading data from
disk if some filter needs them in memory), but it may save some network
bandwidth for us and for our users.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 21 Jul 2008 05:33:01 +0400 |
parents | 45fe5b98a9de |
children | c8cfb6c462ef |
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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 3 bits allows the 7 uses before the cache entry 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_entry_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_entry_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_entry_t *cache; ngx_file_t file; ngx_array_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; size_t key_len; size_t file_start; ngx_file_uniq_t uniq; ngx_log_t *log; /* STUB */ ssize_t header_size; ngx_str_t key0; } ngx_http_cache_t; typedef struct { ngx_path_t *path; ngx_str_t key; ngx_buf_t *buf; unsigned file:1; unsigned memory:1; unsigned primary:1; } 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_int_t ngx_http_cache_get(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx); ngx_int_t ngx_http_file_cache_get(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx); ngx_int_t ngx_http_file_cache_open(ngx_http_cache_t *c); ngx_int_t ngx_http_cache_cleaner_handler(ngx_gc_t *gc, ngx_str_t *name, ngx_dir_t *dir); #if 0 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_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); char *ngx_http_set_cache_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); #endif #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */