Mercurial > hg > nginx-quic
view src/core/ngx_file.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 | 6e10518f95d8 |
children | 8bf484eef9ab |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_FILE_H_INCLUDED_ #define _NGX_FILE_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> struct ngx_file_s { ngx_fd_t fd; ngx_str_t name; ngx_file_info_t info; off_t offset; off_t sys_offset; ngx_log_t *log; #if (NGX_THREADS) ngx_int_t (*thread_handler)(ngx_thread_task_t *task, ngx_file_t *file); void *thread_ctx; ngx_thread_task_t *thread_task; #endif #if (NGX_HAVE_FILE_AIO) ngx_event_aio_t *aio; #endif unsigned valid_info:1; unsigned directio:1; }; #define NGX_MAX_PATH_LEVEL 3 typedef time_t (*ngx_path_manager_pt) (void *data); typedef void (*ngx_path_loader_pt) (void *data); typedef struct { ngx_str_t name; size_t len; size_t level[3]; ngx_path_manager_pt manager; ngx_path_loader_pt loader; void *data; u_char *conf_file; ngx_uint_t line; } ngx_path_t; typedef struct { ngx_str_t name; size_t level[3]; } ngx_path_init_t; typedef struct { ngx_file_t file; off_t offset; ngx_path_t *path; ngx_pool_t *pool; char *warn; ngx_uint_t access; unsigned log_level:8; unsigned persistent:1; unsigned clean:1; unsigned thread_write:1; } ngx_temp_file_t; typedef struct { ngx_uint_t access; ngx_uint_t path_access; time_t time; ngx_fd_t fd; unsigned create_path:1; unsigned delete_file:1; ngx_log_t *log; } ngx_ext_rename_file_t; typedef struct { off_t size; size_t buf_size; ngx_uint_t access; time_t time; ngx_log_t *log; } ngx_copy_file_t; typedef struct ngx_tree_ctx_s ngx_tree_ctx_t; typedef ngx_int_t (*ngx_tree_init_handler_pt) (void *ctx, void *prev); typedef ngx_int_t (*ngx_tree_handler_pt) (ngx_tree_ctx_t *ctx, ngx_str_t *name); struct ngx_tree_ctx_s { off_t size; off_t fs_size; ngx_uint_t access; time_t mtime; ngx_tree_init_handler_pt init_handler; ngx_tree_handler_pt file_handler; ngx_tree_handler_pt pre_tree_handler; ngx_tree_handler_pt post_tree_handler; ngx_tree_handler_pt spec_handler; void *data; size_t alloc; ngx_log_t *log; }; ngx_int_t ngx_get_full_name(ngx_pool_t *pool, ngx_str_t *prefix, ngx_str_t *name); ssize_t ngx_write_chain_to_temp_file(ngx_temp_file_t *tf, ngx_chain_t *chain); ngx_int_t ngx_create_temp_file(ngx_file_t *file, ngx_path_t *path, ngx_pool_t *pool, ngx_uint_t persistent, ngx_uint_t clean, ngx_uint_t access); void ngx_create_hashed_filename(ngx_path_t *path, u_char *file, size_t len); ngx_int_t ngx_create_path(ngx_file_t *file, ngx_path_t *path); ngx_err_t ngx_create_full_path(u_char *dir, ngx_uint_t access); ngx_int_t ngx_add_path(ngx_conf_t *cf, ngx_path_t **slot); ngx_int_t ngx_create_paths(ngx_cycle_t *cycle, ngx_uid_t user); ngx_int_t ngx_ext_rename_file(ngx_str_t *src, ngx_str_t *to, ngx_ext_rename_file_t *ext); ngx_int_t ngx_copy_file(u_char *from, u_char *to, ngx_copy_file_t *cf); ngx_int_t ngx_walk_tree(ngx_tree_ctx_t *ctx, ngx_str_t *tree); ngx_atomic_uint_t ngx_next_temp_number(ngx_uint_t collision); char *ngx_conf_set_path_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); char *ngx_conf_merge_path_value(ngx_conf_t *cf, ngx_path_t **path, ngx_path_t *prev, ngx_path_init_t *init); char *ngx_conf_set_access_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); extern ngx_atomic_t *ngx_temp_number; extern ngx_atomic_int_t ngx_random_number; #endif /* _NGX_FILE_H_INCLUDED_ */