implementing 'get_closest' API for sqlite and postgres datacache plugins

1 files changed, 26 insertions, 0 deletions

diff --git a/src/datacache/plugin_datacache_heap.c b/src/datacache/plugin_datacache_heap.c
index 32e762e23f..5492a8ec59 100644
--- a/src/datacache/plugin_datacache_heap.c
+++ b/src/datacache/plugin_datacache_heap.c
@@ -413,6 +413,31 @@ heap_plugin_get_random (void *cls,
 
 
 /**
+ * Iterate over the results that are "close" to a particular key in
+ * the datacache.  "close" is defined as numerically larger than @a
+ * key (when interpreted as a circular address space), with small
+ * distance.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param key area of the keyspace to look into
+ * @param num_results number of results that should be returned to @a iter
+ * @param iter maybe NULL (to just count)
+ * @param iter_cls closure for @a iter
+ * @return the number of results found
+ */
+static unsigned int
+heap_plugin_get_closest (void *cls,
+                         const struct GNUNET_HashCode *key,
+                         unsigned int num_results,
+                         GNUNET_DATACACHE_Iterator iter,
+                         void *iter_cls)
+{
+  GNUNET_break (0); // not implemented!
+  return 0;
+}
+
+
+/**
  * Entry point for the plugin.
  *
  * @param cls closure (the `struct GNUNET_DATACACHE_PluginEnvironmnet`)
@@ -436,6 +461,7 @@ libgnunet_plugin_datacache_heap_init (void *cls)
   api->put = &heap_plugin_put;
   api->del = &heap_plugin_del;
   api->get_random = &heap_plugin_get_random;
+  api->get_closest = &heap_plugin_get_closest;
   LOG (GNUNET_ERROR_TYPE_INFO,
        _("Heap datacache running\n"));
   return api;