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[PATCH] Core: lingering_close on|off|always

Maxim Dounin
July 11, 2011 09:02AM
# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1309775338 -14400
# Node ID 610e909bb9e29766188aa86fae3abe0bd3432940
# Parent 1c167244d2fdb064c159012c50a7ae3fd1ed254a
Core: lingering_close on|off|always.

Normally nginx uses lingering close if it expects more data from client
(e.g. if it wasn't able to read full request for some reason). With
"lingering_close always;" it's now possible to always use lingering
close. This may be beneficial from compatibility point of view though
may consume extra resources.

Additionally, make sure to activate lingering if we are know there are
some pending data either on header_in buffer or in socket buffer (e.g.
pipelined request and no keepalive enabled).

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -125,6 +125,14 @@ static ngx_conf_enum_t ngx_http_core_sa
};


+static ngx_conf_enum_t ngx_http_core_lingering_close[] = {
+ { ngx_string("off"), NGX_HTTP_LINGERING_OFF },
+ { ngx_string("on"), NGX_HTTP_LINGERING_ON },
+ { ngx_string("always"), NGX_HTTP_LINGERING_ALWAYS },
+ { ngx_null_string, 0 }
+};
+
+
static ngx_conf_enum_t ngx_http_core_if_modified_since[] = {
{ ngx_string("off"), NGX_HTTP_IMS_OFF },
{ ngx_string("exact"), NGX_HTTP_IMS_EXACT },
@@ -530,6 +538,13 @@ static ngx_command_t ngx_http_core_comm
0,
NULL },

+ { ngx_string("lingering_close"),
+ NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+ ngx_conf_set_enum_slot,
+ NGX_HTTP_LOC_CONF_OFFSET,
+ offsetof(ngx_http_core_loc_conf_t, lingering_close),
+ &ngx_http_core_lingering_close },
+
{ ngx_string("lingering_time"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
@@ -3117,6 +3132,7 @@ ngx_http_core_create_loc_conf(ngx_conf_t
clcf->keepalive_timeout = NGX_CONF_UNSET_MSEC;
clcf->keepalive_header = NGX_CONF_UNSET;
clcf->keepalive_requests = NGX_CONF_UNSET_UINT;
+ clcf->lingering_close = NGX_CONF_UNSET_UINT;
clcf->lingering_time = NGX_CONF_UNSET_MSEC;
clcf->lingering_timeout = NGX_CONF_UNSET_MSEC;
clcf->resolver_timeout = NGX_CONF_UNSET_MSEC;
@@ -3333,6 +3349,8 @@ ngx_http_core_merge_loc_conf(ngx_conf_t
prev->keepalive_header, 0);
ngx_conf_merge_uint_value(conf->keepalive_requests,
prev->keepalive_requests, 100);
+ ngx_conf_merge_uint_value(conf->lingering_close,
+ prev->lingering_close, NGX_HTTP_LINGERING_ON);
ngx_conf_merge_msec_value(conf->lingering_time,
prev->lingering_time, 30000);
ngx_conf_merge_msec_value(conf->lingering_timeout,
diff --git a/src/http/ngx_http_core_module.h b/src/http/ngx_http_core_module.h
--- a/src/http/ngx_http_core_module.h
+++ b/src/http/ngx_http_core_module.h
@@ -33,6 +33,11 @@
#define NGX_HTTP_SATISFY_ANY 1


+#define NGX_HTTP_LINGERING_OFF 0
+#define NGX_HTTP_LINGERING_ON 1
+#define NGX_HTTP_LINGERING_ALWAYS 2
+
+
#define NGX_HTTP_IMS_OFF 0
#define NGX_HTTP_IMS_EXACT 1
#define NGX_HTTP_IMS_BEFORE 2
@@ -356,6 +361,7 @@ struct ngx_http_core_loc_conf_s {
ngx_uint_t keepalive_requests; /* keepalive_requests */
ngx_uint_t keepalive_disable; /* keepalive_disable */
ngx_uint_t satisfy; /* satisfy */
+ ngx_uint_t lingering_close; /* lingering_close */
ngx_uint_t if_modified_since; /* if_modified_since */
ngx_uint_t client_body_in_file_only; /* client_body_in_file_only */

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -2146,7 +2146,14 @@ ngx_http_finalize_connection(ngx_http_re
ngx_http_set_keepalive(r);
return;

- } else if (r->lingering_close && clcf->lingering_timeout > 0) {
+ }
+
+ if (clcf->lingering_close == NGX_HTTP_LINGERING_ALWAYS
+ || (clcf->lingering_close == NGX_HTTP_LINGERING_ON
+ && clcf->lingering_timeout > 0
+ && (r->lingering_close || r->header_in->pos < r->header_in->last
+ || r->connection->read->ready)))
+ {
ngx_http_set_lingering_close(r);
return;
}

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Subject Author Views Posted

[PATCH] Core: lingering_close on|off|always

Maxim Dounin 2888 July 11, 2011 09:02AM



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