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view src/http/ngx_http_cache.h @ 58:b55cbf18157e NGINX_0_1_29

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nginx 0.1.29 *) Feature: the ngx_http_ssi_module supports "include virtual" command. *) Feature: the ngx_http_ssi_module supports the condition command like 'if expr="$NAME"' and "else" and "endif" commands. Only one nested level is supported. *) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and DATE_GMT variables and "config timefmt" command. *) Feature: the "ssi_ignore_recycled_buffers" directive. *) Bugfix: the "echo" command did not show the default value for the empty QUERY_STRING variable. *) Change: the ngx_http_proxy_module was rewritten. *) Feature: the "proxy_redirect", "proxy_pass_request_headers", "proxy_pass_request_body", and "proxy_method" directives. *) Feature: the "proxy_set_header" directive. The "proxy_x_var" was canceled and must be replaced with the proxy_set_header directive. *) Change: the "proxy_preserve_host" is canceled and must be replaced with the "proxy_set_header Host $host" and the "proxy_redirect off" directives, the "proxy_set_header Host $host:$proxy_port" directive and the appropriate proxy_redirect directives. *) Change: the "proxy_set_x_real_ip" is canceled and must be replaced with the "proxy_set_header X-Real-IP $remote_addr" directive. *) Change: the "proxy_add_x_forwarded_for" is canceled and must be replaced with the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for" directive. *) Change: the "proxy_set_x_url" is canceled and must be replaced with the "proxy_set_header X-URL http://$host:$server_port$request_uri" directive. *) Feature: the "fastcgi_param" directive. *) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params" directive are canceled and must be replaced with the fastcgi_param directives. *) Feature: the "index" directive can use the variables. *) Feature: the "index" directive can be used at http and server levels. *) Change: the last index only in the "index" directive can be absolute. *) Feature: the "rewrite" directive can use the variables. *) Feature: the "internal" directive. *) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR, SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME, REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables. *) Change: nginx now passes the invalid lines in a client request headers or a backend response header. *) Bugfix: if the backend did not transfer response for a long time and the "send_timeout" was less than "proxy_read_timeout", then nginx returned the 408 response. *) Bugfix: the segmentation fault was occurred if the backend sent an invalid line in response header; bug appeared in 0.1.26. *) Bugfix: the segmentation fault may occurred in FastCGI fault tolerance configuration. *) Bugfix: the "expires" directive did not remove the previous "Expires" and "Cache-Control" headers. *) Bugfix: nginx did not take into account trailing dot in "Host" header line. *) Bugfix: the ngx_http_auth_module did not work under Linux. *) Bugfix: the rewrite directive worked incorrectly, if the arguments were in a request. *) Bugfix: nginx could not be built on MacOS X.
author Igor Sysoev <http://sysoev.ru>
date Thu, 12 May 2005 00:00:00 +0400
parents 45fe5b98a9de
children
line wrap: on
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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_ */