[nginx] Added warning about unset cache keys.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/906530c9ffd2
branches:  
changeset: 5829:906530c9ffd2
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Thu Sep 11 20:08:52 2014 +0400
description:
Added warning about unset cache keys.

In fastcgi, scgi and uwsgi modules there are no default cache keys, and
using a cache without a cache key set is likely meaningless.

diffstat:

 src/http/modules/ngx_http_fastcgi_module.c |  5 +++++
 src/http/modules/ngx_http_scgi_module.c    |  5 +++++
 src/http/modules/ngx_http_uwsgi_module.c   |  5 +++++
 3 files changed, 15 insertions(+), 0 deletions(-)

diffs (45 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
@@ -2582,6 +2582,11 @@ ngx_http_fastcgi_merge_loc_conf(ngx_conf
         conf->cache_key = prev->cache_key;
     }
 
+    if (conf->upstream.cache && conf->cache_key.value.data == NULL) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "no \"fastcgi_cache_key\" for \"fastcgi_cache\"");
+    }
+
     ngx_conf_merge_value(conf->upstream.cache_lock,
                               prev->upstream.cache_lock, 0);
 
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
@@ -1337,6 +1337,11 @@ ngx_http_scgi_merge_loc_conf(ngx_conf_t 
         conf->cache_key = prev->cache_key;
     }
 
+    if (conf->upstream.cache && conf->cache_key.value.data == NULL) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "no \"scgi_cache_key\" for \"scgi_cache\"");
+    }
+
     ngx_conf_merge_value(conf->upstream.cache_lock,
                               prev->upstream.cache_lock, 0);
 
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
@@ -1524,6 +1524,11 @@ ngx_http_uwsgi_merge_loc_conf(ngx_conf_t
         conf->cache_key = prev->cache_key;
     }
 
+    if (conf->upstream.cache && conf->cache_key.value.data == NULL) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "no \"uwsgi_cache_key\" for \"uwsgi_cache\"");
+    }
+
     ngx_conf_merge_value(conf->upstream.cache_lock,
                               prev->upstream.cache_lock, 0);