Mercurial > hg > nginx-quic
view src/core/ngx_open_file_cache.h @ 6750:cb330cd39030 stable-1.10
HTTP/2: implemented preread buffer for request body (closes #959).
Previously, the stream's window was kept zero in order to prevent a client
from sending the request body before it was requested (see 887cca40ba6a for
details). Until such initial window was acknowledged all requests with
data were rejected (see 0aa07850922f for details).
That approach revealed a number of problems:
1. Some clients (notably MS IE/Edge, Safari, iOS applications) show an error
or even crash if a stream is rejected;
2. This requires at least one RTT for every request with body before the
client receives window update and able to send data.
To overcome these problems the new directive "http2_body_preread_size" is
introduced. It sets the initial window and configures a special per stream
preread buffer that is used to save all incoming data before the body is
requested and processed.
If the directive's value is lower than the default initial window (65535),
as previously, all streams with data will be rejected until the new window
is acknowledged. Otherwise, no special processing is used and all requests
with data are welcome right from the connection start.
The default value is chosen to be 64k, which is bigger than the default
initial window. Setting it to zero is fully complaint to the previous
behavior.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Tue, 24 May 2016 17:37:52 +0300 |
parents | 47ece8818978 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #ifndef _NGX_OPEN_FILE_CACHE_H_INCLUDED_ #define _NGX_OPEN_FILE_CACHE_H_INCLUDED_ #define NGX_OPEN_FILE_DIRECTIO_OFF NGX_MAX_OFF_T_VALUE typedef struct { ngx_fd_t fd; ngx_file_uniq_t uniq; time_t mtime; off_t size; off_t fs_size; off_t directio; size_t read_ahead; ngx_err_t err; char *failed; time_t valid; ngx_uint_t min_uses; #if (NGX_HAVE_OPENAT) size_t disable_symlinks_from; unsigned disable_symlinks:2; #endif unsigned test_dir:1; unsigned test_only:1; unsigned log:1; unsigned errors:1; unsigned events:1; unsigned is_dir:1; unsigned is_file:1; unsigned is_link:1; unsigned is_exec:1; unsigned is_directio:1; } ngx_open_file_info_t; typedef struct ngx_cached_open_file_s ngx_cached_open_file_t; struct ngx_cached_open_file_s { ngx_rbtree_node_t node; ngx_queue_t queue; u_char *name; time_t created; time_t accessed; ngx_fd_t fd; ngx_file_uniq_t uniq; time_t mtime; off_t size; ngx_err_t err; uint32_t uses; #if (NGX_HAVE_OPENAT) size_t disable_symlinks_from; unsigned disable_symlinks:2; #endif unsigned count:24; unsigned close:1; unsigned use_event:1; unsigned is_dir:1; unsigned is_file:1; unsigned is_link:1; unsigned is_exec:1; unsigned is_directio:1; ngx_event_t *event; }; typedef struct { ngx_rbtree_t rbtree; ngx_rbtree_node_t sentinel; ngx_queue_t expire_queue; ngx_uint_t current; ngx_uint_t max; time_t inactive; } ngx_open_file_cache_t; typedef struct { ngx_open_file_cache_t *cache; ngx_cached_open_file_t *file; ngx_uint_t min_uses; ngx_log_t *log; } ngx_open_file_cache_cleanup_t; typedef struct { /* ngx_connection_t stub to allow use c->fd as event ident */ void *data; ngx_event_t *read; ngx_event_t *write; ngx_fd_t fd; ngx_cached_open_file_t *file; ngx_open_file_cache_t *cache; } ngx_open_file_cache_event_t; ngx_open_file_cache_t *ngx_open_file_cache_init(ngx_pool_t *pool, ngx_uint_t max, time_t inactive); ngx_int_t ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name, ngx_open_file_info_t *of, ngx_pool_t *pool); #endif /* _NGX_OPEN_FILE_CACHE_H_INCLUDED_ */