From 66872cf6ba34329254c82cf948fef333e5dc4c9c Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Thu, 30 Apr 2015 08:00:51 +0000
Subject: [PATCH] -towards an API for the successor set

---
 src/dht/gnunet-service-wdht_datacache.c | 23 +++++++++++++++++++++++
 src/dht/gnunet-service-wdht_datacache.h | 10 ++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/dht/gnunet-service-wdht_datacache.c b/src/dht/gnunet-service-wdht_datacache.c
index 6bf68028a..978c8f177 100644
--- a/src/dht/gnunet-service-wdht_datacache.c
+++ b/src/dht/gnunet-service-wdht_datacache.c
@@ -36,6 +36,12 @@
 #define DEBUG(...)                                           \
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
 
+/**
+ * How many "closest" results to we return for migration when
+ * asked (at most)?
+ */
+#define NUM_CLOSEST 42
+
 /**
  * Handle to the datacache service (for inserting/retrieving data)
  */
@@ -423,6 +429,23 @@ GDS_DATACACHE_get_random_key (struct GNUNET_HashCode *key)
 }
 
 
+/**
+ * Handle a request for data close to a key that we have received from
+ * another peer.
+ *
+ * @param key the location at which the peer is looking for data that is close
+ */
+void
+GDS_DATACACHE_get_successors (const struct GNUNET_HashCode *key)
+{
+  GNUNET_DATACACHE_get_closest (datacache,
+                                key,
+                                NUM_CLOSEST,
+                                NULL /* FIXME */,
+                                NULL);
+}
+
+
 /**
  * Initialize datacache subsystem.
  */
diff --git a/src/dht/gnunet-service-wdht_datacache.h b/src/dht/gnunet-service-wdht_datacache.h
index 0b28477c1..818138a87 100644
--- a/src/dht/gnunet-service-wdht_datacache.h
+++ b/src/dht/gnunet-service-wdht_datacache.h
@@ -87,6 +87,16 @@ int
 GDS_DATACACHE_get_random_key (struct GNUNET_HashCode *key);
 
 
+/**
+ * Handle a request for data close to a key that we have received from
+ * another peer.
+ *
+ * @param key the location at which the peer is looking for data that is close
+ */
+void
+GDS_DATACACHE_get_successors (const struct GNUNET_HashCode *key);
+
+
 /**
  * Initialize datacache subsystem.
  */
-- 
2.25.1