[nginx] Stream: fixed logging UDP upstream timeout.

[Roman Arutyunyan]

details:   http://hg.nginx.org/nginx/rev/0846dd76a487
branches:  
changeset: 7105:0846dd76a487
user:      Roman Arutyunyan <arut at nginx.com>
date:      Tue Sep 12 13:44:04 2017 +0300
description:
Stream: fixed logging UDP upstream timeout.

Previously, when the first UDP response packet was not received from the
proxied server within proxy_timeout, no error message was logged before
switching to the next upstream.  Additionally, when one of succeeding response
packets was not received within the timeout, the timeout error had low severity
because it was logged as a client connection error as opposed to upstream
connection error.

diffstat:

 src/stream/ngx_stream_proxy_module.c |  6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diffs (22 lines):

diff -r cdbcb73239ee -r 0846dd76a487 src/stream/ngx_stream_proxy_module.c
--- a/src/stream/ngx_stream_proxy_module.c	Wed Sep 13 15:53:19 2017 +0300
+++ b/src/stream/ngx_stream_proxy_module.c	Tue Sep 12 13:44:04 2017 +0300
@@ -1331,13 +1331,17 @@ ngx_stream_proxy_process_connection(ngx_
                     return;
                 }
 
+                ngx_connection_error(pc, NGX_ETIMEDOUT, "upstream timed out");
+
                 if (u->received == 0) {
                     ngx_stream_proxy_next_upstream(s);
                     return;
                 }
+
+            } else {
+                ngx_connection_error(c, NGX_ETIMEDOUT, "connection timed out");
             }
 
-            ngx_connection_error(c, NGX_ETIMEDOUT, "connection timed out");
             ngx_stream_proxy_finalize(s, NGX_STREAM_OK);
             return;
         }