apcups plugin: Change "PersistentConnection" option default value depending on poll...

diff --git a/src/apcups.c b/src/apcups.c
index 8006bd1..591f6ac 100644 (file)
--- a/src/apcups.c
+++ b/src/apcups.c
@@ -378,6 +378,7 @@ static int apc_query_server (char const *node, char const *service,
 static int apcups_config (oconfig_item_t *ci)
 {
        int i;
+       _Bool persistent_conn_set = 0;
 
        for (i = 0; i < ci->children_num; i++)
        {
@@ -389,12 +390,25 @@ static int apcups_config (oconfig_item_t *ci)
                        cf_util_get_service (child, &conf_service);
                else if (strcasecmp (child->key, "ReportSeconds") == 0)
                        cf_util_get_boolean (child, &conf_report_seconds);
-               else if (strcasecmp (child->key, "PersistentConnection") == 0)
+               else if (strcasecmp (child->key, "PersistentConnection") == 0) {
                        cf_util_get_boolean (child, &conf_persistent_conn);
+                       persistent_conn_set = 1;
+               }
                else
                        ERROR ("apcups plugin: Unknown config option \"%s\".", child->key);
        }
 
+       if (!persistent_conn_set) {
+               double interval = CDTIME_T_TO_DOUBLE(plugin_get_interval());
+               if (interval > 15.0) {
+                       NOTICE ("apcups plugin: Plugin poll interval set to %.3f seconds. "
+                               "Apcupsd NIS socket timeout is 15 seconds, "
+                               "PersistentConnection disabled by default.",
+                               interval);
+                       conf_persistent_conn = 0;
+               }
+       }
+
        return (0);
 } /* int apcups_config */
 

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index 43dfeae..23af31a 100644 (file)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -834,13 +834,15 @@ default for backwards compatibility, the time will be reported in minutes.
 
 =item B<PersistentConnection> B<true>|B<false>
 
-By default, the plugin will try to keep the connection to UPS open between
-reads. Since this appears to be somewhat brittle (I<apcupsd> appears to close
-the connection due to inactivity quite quickly), the plugin will try to detect
-this problem and switch to an open-read-close mode in such cases.
+The plugin is designed to keep the connection to I<apcupsd> open between reads.
+If plugin poll interval is greater than 15 seconds (hardcoded socket close
+timeout in I<apcupsd> NIS), then this option is B<false> by default.
 
 You can instruct the plugin to close the connection after each read by setting
-this option to B<false>.
+this option to B<false> or force keeping the connection by setting it to B<true>.
+
+If I<apcupsd> appears to close the connection due to inactivity quite quickly,
+the plugin will try to detect this problem and switch to an open-read-close mode.
 
 =back