plugin: Report an error when writing to the store with no writers.

diff --git a/src/core/plugin.c b/src/core/plugin.c
index 26b1408001717d0a7fb2aa9d953a3c3a0125a8f9..da8a485b960a4786b914102e9f9fbc741378170a 100644 (file)
--- a/src/core/plugin.c
+++ b/src/core/plugin.c
@@ -1465,6 +1465,12 @@ sdb_plugin_store_host(const char *name, sdb_time_t last_update)
        if (! name)
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store host: "
+                               "no writers registered");
+               return -1;
+       }
+
        iter = sdb_llist_get_iter(writer_list);
        while (sdb_llist_iter_has_next(iter)) {
                writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
@@ -1488,6 +1494,12 @@ sdb_plugin_store_service(const char *hostname, const char *name,
        if ((! hostname) || (! name))
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store service: "
+                               "no writers registered");
+               return -1;
+       }
+
        iter = sdb_llist_get_iter(writer_list);
        while (sdb_llist_iter_has_next(iter)) {
                writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
@@ -1512,6 +1524,12 @@ sdb_plugin_store_metric(const char *hostname, const char *name,
        if ((! hostname) || (! name))
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store metric: "
+                               "no writers registered");
+               return -1;
+       }
+
        if (store && ((! store->type) || (! store->id)))
                store = NULL;
 
@@ -1539,6 +1557,12 @@ sdb_plugin_store_attribute(const char *hostname, const char *key,
        if ((! hostname) || (! key) || (! value))
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store attribute: "
+                               "no writers registered");
+               return -1;
+       }
+
        iter = sdb_llist_get_iter(writer_list);
        while (sdb_llist_iter_has_next(iter)) {
                writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
@@ -1563,6 +1587,12 @@ sdb_plugin_store_service_attribute(const char *hostname, const char *service,
        if ((! hostname) || (! service) || (! key) || (! value))
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store service attribute: "
+                               "no writers registered");
+               return -1;
+       }
+
        iter = sdb_llist_get_iter(writer_list);
        while (sdb_llist_iter_has_next(iter)) {
                writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
@@ -1587,6 +1617,12 @@ sdb_plugin_store_metric_attribute(const char *hostname, const char *metric,
        if ((! hostname) || (! metric) || (! key) || (! value))
                return -1;
 
+       if (! sdb_llist_len(writer_list)) {
+               sdb_log(SDB_LOG_ERR, "core: Cannot store metric attribute: "
+                               "no writers registered");
+               return -1;
+       }
+
        iter = sdb_llist_get_iter(writer_list);
        while (sdb_llist_iter_has_next(iter)) {
                writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));