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822fe46934
New directives: proxy_cache_lock on/off, proxy_cache_lock_timeout. With
proxy_cache_lock set to on, only one request will be allowed to go to
upstream for a particular cache item. Others will wait for a response
to appear in cache (or cache lock released) up to proxy_cache_lock_timeout.
Waiting requests will recheck if they have cached response ready (or are
allowed to run) every 500ms.
Note: we intentionally don't intercept NGX_DECLINED possibly returned by
ngx_http_file_cache_read(). This needs more work (possibly safe, but needs
further investigation). Anyway, it's exceptional situation.
Note: probably there should be a way to disable caching of responses
if there is already one request fetching resource to cache (without waiting
at all). Two possible ways include another cache lock option ("no_cache")
or using proxy_no_cache with some supplied variable.
Note: probably there should be a way to lock updating requests as well. For
now "proxy_cache_use_stale updating" is available.
159 lines
4.9 KiB
C
159 lines
4.9 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#ifndef _NGX_HTTP_CACHE_H_INCLUDED_
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#define _NGX_HTTP_CACHE_H_INCLUDED_
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#define NGX_HTTP_CACHE_MISS 1
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#define NGX_HTTP_CACHE_BYPASS 2
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#define NGX_HTTP_CACHE_EXPIRED 3
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#define NGX_HTTP_CACHE_STALE 4
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#define NGX_HTTP_CACHE_UPDATING 5
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#define NGX_HTTP_CACHE_HIT 6
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#define NGX_HTTP_CACHE_SCARCE 7
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#define NGX_HTTP_CACHE_KEY_LEN 16
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typedef struct {
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ngx_uint_t status;
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time_t valid;
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} ngx_http_cache_valid_t;
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typedef struct {
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ngx_rbtree_node_t node;
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ngx_queue_t queue;
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u_char key[NGX_HTTP_CACHE_KEY_LEN
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- sizeof(ngx_rbtree_key_t)];
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unsigned count:20;
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unsigned uses:10;
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unsigned valid_msec:10;
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unsigned error:10;
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unsigned exists:1;
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unsigned updating:1;
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unsigned deleting:1;
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/* 11 unused bits */
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ngx_file_uniq_t uniq;
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time_t expire;
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time_t valid_sec;
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size_t body_start;
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off_t fs_size;
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} ngx_http_file_cache_node_t;
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struct ngx_http_cache_s {
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ngx_file_t file;
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ngx_array_t keys;
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uint32_t crc32;
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u_char key[NGX_HTTP_CACHE_KEY_LEN];
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ngx_file_uniq_t uniq;
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time_t valid_sec;
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time_t last_modified;
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time_t date;
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size_t header_start;
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size_t body_start;
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off_t length;
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off_t fs_size;
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ngx_uint_t min_uses;
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ngx_uint_t error;
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ngx_uint_t valid_msec;
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ngx_buf_t *buf;
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ngx_http_file_cache_t *file_cache;
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ngx_http_file_cache_node_t *node;
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ngx_msec_t lock_timeout;
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ngx_msec_t wait_time;
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ngx_event_t wait_event;
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unsigned lock:1;
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unsigned waiting:1;
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unsigned updated:1;
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unsigned updating:1;
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unsigned exists:1;
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unsigned temp_file:1;
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};
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typedef struct {
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time_t valid_sec;
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time_t last_modified;
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time_t date;
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uint32_t crc32;
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u_short valid_msec;
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u_short header_start;
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u_short body_start;
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} ngx_http_file_cache_header_t;
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typedef struct {
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ngx_rbtree_t rbtree;
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ngx_rbtree_node_t sentinel;
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ngx_queue_t queue;
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ngx_atomic_t cold;
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ngx_atomic_t loading;
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off_t size;
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} ngx_http_file_cache_sh_t;
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struct ngx_http_file_cache_s {
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ngx_http_file_cache_sh_t *sh;
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ngx_slab_pool_t *shpool;
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ngx_path_t *path;
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off_t max_size;
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size_t bsize;
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time_t inactive;
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ngx_uint_t files;
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ngx_uint_t loader_files;
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ngx_msec_t last;
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ngx_msec_t loader_sleep;
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ngx_msec_t loader_threshold;
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ngx_shm_zone_t *shm_zone;
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};
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ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r);
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ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r);
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void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
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void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
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ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
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void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf);
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time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
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char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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extern ngx_str_t ngx_http_cache_status[];
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#endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */
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