postgresql plugin: Do not open new connections during reinitialization.

When reinitializing the plugin a new connection to all databases has been
opened. Now, we check if the connection already exists. In that case no new
connection will be opened but the existing connection will be pinged instead.

Thanks to Admin <collectd-info@internode.com.au> for finding and reporting
this.

Signed-off-by: Sebastian Harl <sh@tokkee.org>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/src/postgresql.c b/src/postgresql.c
index 9959690..90e9f5d 100644 (file)
--- a/src/postgresql.c
+++ b/src/postgresql.c
@@ -244,6 +244,7 @@ static c_psql_database_t *c_psql_database_new (const char *name)
 static void c_psql_database_delete (c_psql_database_t *db)
 {
        PQfinish (db->conn);
+       db->conn = NULL;
 
        sfree (db->queries);
        db->queries_num = 0;
@@ -549,6 +550,12 @@ static int c_psql_init (void)
 
                int j;
 
+               /* this will happen during reinitialization */
+               if (NULL != db->conn) {
+                       c_psql_check_connection (db);
+                       continue;
+               }
+
                status = ssnprintf (buf, buf_len, "dbname = '%s'", db->database);
                if (0 < status) {
                        buf     += status;