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[nginx] Upstream: cache revalidation using If-None-Match.

Maxim Dounin
June 25, 2014 06:42PM
details: http://hg.nginx.org/nginx/rev/c95d7882dfc9
branches:
changeset: 5738:c95d7882dfc9
user: Maxim Dounin <mdounin@mdounin.ru>
date: Thu Jun 26 02:35:01 2014 +0400
description:
Upstream: cache revalidation using If-None-Match.

diffstat:

src/http/modules/ngx_http_fastcgi_module.c | 2 +-
src/http/modules/ngx_http_proxy_module.c | 2 +-
src/http/modules/ngx_http_scgi_module.c | 2 +-
src/http/modules/ngx_http_uwsgi_module.c | 2 +-
src/http/ngx_http_upstream.c | 29 +++++++++++++++++++++++++++++
5 files changed, 33 insertions(+), 4 deletions(-)

diffs (101 lines):

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -573,7 +573,7 @@ static ngx_keyval_t ngx_http_fastcgi_ca
{ ngx_string("HTTP_IF_MODIFIED_SINCE"),
ngx_string("$upstream_cache_last_modified") },
{ ngx_string("HTTP_IF_UNMODIFIED_SINCE"), ngx_string("") },
- { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("") },
+ { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("$upstream_cache_etag") },
{ ngx_string("HTTP_IF_MATCH"), ngx_string("") },
{ ngx_string("HTTP_RANGE"), ngx_string("") },
{ ngx_string("HTTP_IF_RANGE"), ngx_string("") },
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -677,7 +677,7 @@ static ngx_keyval_t ngx_http_proxy_cach
{ ngx_string("If-Modified-Since"),
ngx_string("$upstream_cache_last_modified") },
{ ngx_string("If-Unmodified-Since"), ngx_string("") },
- { ngx_string("If-None-Match"), ngx_string("") },
+ { ngx_string("If-None-Match"), ngx_string("$upstream_cache_etag") },
{ ngx_string("If-Match"), ngx_string("") },
{ ngx_string("Range"), ngx_string("") },
{ ngx_string("If-Range"), ngx_string("") },
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -379,7 +379,7 @@ static ngx_keyval_t ngx_http_scgi_cache
{ ngx_string("HTTP_IF_MODIFIED_SINCE"),
ngx_string("$upstream_cache_last_modified") },
{ ngx_string("HTTP_IF_UNMODIFIED_SINCE"), ngx_string("") },
- { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("") },
+ { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("$upstream_cache_etag") },
{ ngx_string("HTTP_IF_MATCH"), ngx_string("") },
{ ngx_string("HTTP_RANGE"), ngx_string("") },
{ ngx_string("HTTP_IF_RANGE"), ngx_string("") },
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -507,7 +507,7 @@ static ngx_keyval_t ngx_http_uwsgi_cach
{ ngx_string("HTTP_IF_MODIFIED_SINCE"),
ngx_string("$upstream_cache_last_modified") },
{ ngx_string("HTTP_IF_UNMODIFIED_SINCE"), ngx_string("") },
- { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("") },
+ { ngx_string("HTTP_IF_NONE_MATCH"), ngx_string("$upstream_cache_etag") },
{ ngx_string("HTTP_IF_MATCH"), ngx_string("") },
{ ngx_string("HTTP_RANGE"), ngx_string("") },
{ ngx_string("HTTP_IF_RANGE"), ngx_string("") },
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -19,6 +19,8 @@ static ngx_int_t ngx_http_upstream_cache
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_cache_last_modified(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_upstream_cache_etag(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data);
#endif

static void ngx_http_upstream_init_request(ngx_http_request_t *r);
@@ -367,6 +369,10 @@ static ngx_http_variable_t ngx_http_ups
ngx_http_upstream_cache_last_modified, 0,
NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },

+ { ngx_string("upstream_cache_etag"), NULL,
+ ngx_http_upstream_cache_etag, 0,
+ NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },
+
#endif

{ ngx_null_string, NULL, NULL, 0, 0, 0 }
@@ -4792,6 +4798,29 @@ ngx_http_upstream_cache_last_modified(ng
return NGX_OK;
}

+
+static ngx_int_t
+ngx_http_upstream_cache_etag(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data)
+{
+ if (r->upstream == NULL
+ || !r->upstream->conf->cache_revalidate
+ || r->upstream->cache_status != NGX_HTTP_CACHE_EXPIRED
+ || r->cache->etag.len == 0)
+ {
+ v->not_found = 1;
+ return NGX_OK;
+ }
+
+ v->valid = 1;
+ v->no_cacheable = 0;
+ v->not_found = 0;
+ v->len = r->cache->etag.len;
+ v->data = r->cache->etag.data;
+
+ return NGX_OK;
+}
+
#endif



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Subject Author Views Posted

[nginx] Upstream: cache revalidation using If-None-Match.

Maxim Dounin 739 June 25, 2014 06:42PM



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