X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fwrite_redis.c;h=7dd5029ce1a6da94c0d4d1773c5a7eaa91beb198;hb=a9e50e9e30ecde17e167e271060c8183bfcbf407;hp=7be236ad089f3189a8ec07250fb1c1d2c9fc18a0;hpb=3e5eb5fbbd3881150f407a4877faa1377aeef50d;p=collectd.git

diff --git a/src/write_redis.c b/src/write_redis.c
index 7be236ad..7dd5029c 100644
--- a/src/write_redis.c
+++ b/src/write_redis.c
@@ -45,6 +45,7 @@ struct wr_node_s {
   char *prefix;
   int database;
   int max_set_size;
+  int max_set_duration;
   _Bool store_rates;
 
   redisContext *conn;
@@ -71,8 +72,7 @@ static int wr_write(const data_set_t *ds, /* {{{ */
   if (status != 0)
     return status;
   snprintf(key, sizeof(key), "%s%s",
-            (node->prefix != NULL) ? node->prefix : REDIS_DEFAULT_PREFIX,
-            ident);
+           (node->prefix != NULL) ? node->prefix : REDIS_DEFAULT_PREFIX, ident);
   snprintf(time, sizeof(time), "%.9f", CDTIME_T_TO_DOUBLE(vl->time));
 
   value_size = sizeof(value);
@@ -126,6 +126,20 @@ static int wr_write(const data_set_t *ds, /* {{{ */
       freeReplyObject(rr);
   }
 
+  if (node->max_set_duration > 0) {
+    /*
+     * remove element, scored less than 'current-max_set_duration'
+     * '(%d' indicates 'less than' in redis CLI.
+     */
+    rr = redisCommand(node->conn, "ZREMRANGEBYSCORE %s -1 (%d", key,
+                      (time - node->max_set_duration) + 1);
+    if (rr == NULL)
+      WARNING("ZREMRANGEBYSCORE command error. key:%s message:%s", key,
+              node->conn->errstr);
+    else
+      freeReplyObject(rr);
+  }
+
   /* TODO(octo): This is more overhead than necessary. Use the cache and
    * metadata to determine if it is a new metric and call SADD only once for
    * each metric. */
@@ -176,6 +190,7 @@ static int wr_config_node(oconfig_item_t *ci) /* {{{ */
   node->prefix = NULL;
   node->database = 0;
   node->max_set_size = -1;
+  node->max_set_duration = -1;
   node->store_rates = 1;
   pthread_mutex_init(&node->lock, /* attr = */ NULL);
 
@@ -206,6 +221,8 @@ static int wr_config_node(oconfig_item_t *ci) /* {{{ */
       status = cf_util_get_int(child, &node->database);
     } else if (strcasecmp("MaxSetSize", child->key) == 0) {
       status = cf_util_get_int(child, &node->max_set_size);
+    } else if (strcasecmp("MaxSetDuration", child->key) == 0) {
+      status = cf_util_get_int(child, &node->max_set_duration);
     } else if (strcasecmp("StoreRates", child->key) == 0) {
       status = cf_util_get_boolean(child, &node->store_rates);
     } else
@@ -221,10 +238,11 @@ static int wr_config_node(oconfig_item_t *ci) /* {{{ */
 
     snprintf(cb_name, sizeof(cb_name), "write_redis/%s", node->name);
 
-    status = plugin_register_write(
-        cb_name, wr_write, &(user_data_t){
-                               .data = node, .free_func = wr_config_free,
-                           });
+    status =
+        plugin_register_write(cb_name, wr_write,
+                              &(user_data_t){
+                                  .data = node, .free_func = wr_config_free,
+                              });
   }
 
   if (status != 0)