user varargs in store the watch callback

Signed-off-by: Victor Vieux <victorvieux@gmail.com>

discovery/kv/kv.go

@@ -71,7 +71,7 @@ func (s *Discovery) Fetch() ([]*discovery.Entry, error) {
 
 // Watch is exported
 func (s *Discovery) Watch(callback discovery.WatchCallback) {
-	s.store.WatchRange(s.prefix, "", s.heartbeat, func(kvalues []store.KVEntry) {
+	s.store.WatchRange(s.prefix, "", s.heartbeat, func(kvalues ...store.KVEntry) {
 		// Traduce byte array entries to discovery.Entry
 		entries, _ := discovery.CreateEntries(convertToStringArray(kvalues))
 		callback(entries)

pkg/store/consul.go

@@ -160,9 +160,7 @@ func (s *Consul) Watch(key string, heartbeat time.Duration, callback WatchCallba
 			s.watches[fkey] = nil
 			return err
 		}
-
-		value := []KVEntry{&kviTuple{key, entry, index}}
-		callback(value)
+		callback(&kviTuple{key, entry, index})
 	}
 
 	return nil
@@ -230,7 +228,7 @@ func (s *Consul) WatchRange(prefix string, filter string, heartbeat time.Duratio
 			s.watches[fprefix] = nil
 			return err
 		}
-		callback(kvi)
+		callback(kvi...)
 	}
 
 	return nil

pkg/store/etcd.go

@@ -153,8 +153,7 @@ func (s *Etcd) Watch(key string, _ time.Duration, callback WatchCallback) error
 			s.watches[key] = nil
 			return err
 		}
-		kvi := []KVEntry{&kviTuple{key, entry, index}}
-		callback(kvi)
+		callback(&kviTuple{key, entry, index})
 	}
 	return nil
 }
@@ -242,7 +241,7 @@ func (s *Etcd) WatchRange(prefix string, filter string, _ time.Duration, callbac
 			s.watches[prefix] = nil
 			return err
 		}
-		callback(kvi)
+		callback(kvi...)
 	}
 	return nil
 }

pkg/store/store.go

@@ -8,7 +8,7 @@ import (
 
 // WatchCallback is used for watch methods on keys
 // and is triggered on key change
-type WatchCallback func(kviTuple []KVEntry)
+type WatchCallback func(kviTuple ...KVEntry)
 
 // Initialize creates a new Store object, initializing the client
 type Initialize func(addrs []string, options Config) (Store, error)

pkg/store/zookeeper.go

@@ -113,9 +113,8 @@ func (s *Zookeeper) Watch(key string, _ time.Duration, callback WatchCallback) e
 		if e.Type == zk.EventNodeChildrenChanged {
 			log.WithField("name", "zk").Debug("Discovery watch triggered")
 			entry, index, err := s.Get(key)
-			kvi := []KVEntry{&kviTuple{key, []byte(entry), index}}
 			if err == nil {
-				callback(kvi)
+				callback(&kviTuple{key, []byte(entry), index})
 			}
 		}
 	}
@@ -172,7 +171,7 @@ func (s *Zookeeper) WatchRange(prefix string, filter string, _ time.Duration, ca
 			log.WithField("name", "zk").Debug("Discovery watch triggered")
 			kvi, err := s.GetRange(prefix)
 			if err == nil {
-				callback(kvi)
+				callback(kvi...)
 			}
 		}
 	}