Add postgresql writer option to skip older values.

diff --git a/src/postgresql.c b/src/postgresql.c
index 16e539a..cdd3e3f 100644 (file)
--- a/src/postgresql.c
+++ b/src/postgresql.c
@@ -141,6 +141,7 @@ typedef struct {
        /* writer "caching" settings */
        cdtime_t commit_interval;
        cdtime_t next_commit;
+       cdtime_t expire_delay;
 
        char *host;
        char *port;
@@ -263,6 +264,7 @@ static c_psql_database_t *c_psql_database_new (const char *name)
 
        db->commit_interval = 0;
        db->next_commit     = 0;
+       db->expire_delay    = 0;
 
        db->database   = sstrdup (name);
        db->host       = NULL;
@@ -873,6 +875,12 @@ static int c_psql_write (const data_set_t *ds, const value_list_t *vl,
 
 #undef VALUE_OR_NULL
 
+       if( db->expire_delay > 0 && vl->time < (cdtime() - vl->interval - db->expire_delay) ) {
+               log_info ("c_psql_write: Skipped expired value @ %s - %s/%s-%s/%s-%s/%s", 
+                       params[0], params[1], params[2], params[3], params[4], params[5], params[6] );
+               return 0;
+        }
+
        pthread_mutex_lock (&db->db_lock);
 
        if (0 != c_psql_check_connection (db)) {
@@ -1242,6 +1250,8 @@ static int c_psql_config_database (oconfig_item_t *ci)
                        cf_util_get_cdtime (c, &db->interval);
                else if (strcasecmp ("CommitInterval", c->key) == 0)
                        cf_util_get_cdtime (c, &db->commit_interval);
+               else if (strcasecmp ("ExpireDelay", c->key) == 0)
+                       cf_util_get_cdtime (c, &db->expire_delay);
                else
                        log_warn ("Ignoring unknown config key \"%s\".", c->key);
        }