Mercurial > hg > nginx-quic
view src/http/ngx_http_variables.h @ 6412:4ba91a4c66a3
HTTP/2: implemented per request timeouts (closes #626).
Previously, there were only three timeouts used globally for the whole HTTP/2
connection:
1. Idle timeout for inactivity when there are no streams in processing
(the "http2_idle_timeout" directive);
2. Receive timeout for incomplete frames when there are no streams in
processing (the "http2_recv_timeout" directive);
3. Send timeout when there are frames waiting in the output queue
(the "send_timeout" directive on a server level).
Reaching one of these timeouts leads to HTTP/2 connection close.
This left a number of scenarios when a connection can get stuck without any
processing and timeouts:
1. A client has sent the headers block partially so nginx starts processing
a new stream but cannot continue without the rest of HEADERS and/or
CONTINUATION frames;
2. When nginx waits for the request body;
3. All streams are stuck on exhausted connection or stream windows.
The first idea that was rejected was to detect when the whole connection
gets stuck because of these situations and set the global receive timeout.
The disadvantage of such approach would be inconsistent behaviour in some
typical use cases. For example, if a user never replies to the browser's
question about where to save the downloaded file, the stream will be
eventually closed by a timeout. On the other hand, this will not happen
if there's some activity in other concurrent streams.
Now almost all the request timeouts work like in HTTP/1.x connections, so
the "client_header_timeout", "client_body_timeout", and "send_timeout" are
respected. These timeouts close the request.
The global timeouts work as before.
Previously, the c->write->delayed flag was abused to avoid setting timeouts on
stream events. Now, the "active" and "ready" flags are manipulated instead to
control the processing of individual streams.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Wed, 24 Feb 2016 15:58:07 +0300 |
parents | a33b8c3aa975 |
children | d2b2ff157da5 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_HTTP_VARIABLES_H_INCLUDED_ #define _NGX_HTTP_VARIABLES_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef ngx_variable_value_t ngx_http_variable_value_t; #define ngx_http_variable(v) { sizeof(v) - 1, 1, 0, 0, 0, (u_char *) v } typedef struct ngx_http_variable_s ngx_http_variable_t; typedef void (*ngx_http_set_variable_pt) (ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); typedef ngx_int_t (*ngx_http_get_variable_pt) (ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); #define NGX_HTTP_VAR_CHANGEABLE 1 #define NGX_HTTP_VAR_NOCACHEABLE 2 #define NGX_HTTP_VAR_INDEXED 4 #define NGX_HTTP_VAR_NOHASH 8 struct ngx_http_variable_s { ngx_str_t name; /* must be first to build the hash */ ngx_http_set_variable_pt set_handler; ngx_http_get_variable_pt get_handler; uintptr_t data; ngx_uint_t flags; ngx_uint_t index; }; ngx_http_variable_t *ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags); ngx_int_t ngx_http_get_variable_index(ngx_conf_t *cf, ngx_str_t *name); ngx_http_variable_value_t *ngx_http_get_indexed_variable(ngx_http_request_t *r, ngx_uint_t index); ngx_http_variable_value_t *ngx_http_get_flushed_variable(ngx_http_request_t *r, ngx_uint_t index); ngx_http_variable_value_t *ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key); ngx_int_t ngx_http_variable_unknown_header(ngx_http_variable_value_t *v, ngx_str_t *var, ngx_list_part_t *part, size_t prefix); #if (NGX_PCRE) typedef struct { ngx_uint_t capture; ngx_int_t index; } ngx_http_regex_variable_t; typedef struct { ngx_regex_t *regex; ngx_uint_t ncaptures; ngx_http_regex_variable_t *variables; ngx_uint_t nvariables; ngx_str_t name; } ngx_http_regex_t; typedef struct { ngx_http_regex_t *regex; void *value; } ngx_http_map_regex_t; ngx_http_regex_t *ngx_http_regex_compile(ngx_conf_t *cf, ngx_regex_compile_t *rc); ngx_int_t ngx_http_regex_exec(ngx_http_request_t *r, ngx_http_regex_t *re, ngx_str_t *s); #endif typedef struct { ngx_hash_combined_t hash; #if (NGX_PCRE) ngx_http_map_regex_t *regex; ngx_uint_t nregex; #endif } ngx_http_map_t; void *ngx_http_map_find(ngx_http_request_t *r, ngx_http_map_t *map, ngx_str_t *match); ngx_int_t ngx_http_variables_add_core_vars(ngx_conf_t *cf); ngx_int_t ngx_http_variables_init_vars(ngx_conf_t *cf); extern ngx_http_variable_value_t ngx_http_variable_null_value; extern ngx_http_variable_value_t ngx_http_variable_true_value; #endif /* _NGX_HTTP_VARIABLES_H_INCLUDED_ */