some work done

pkg/raft/kv.go

@@ -24,6 +24,18 @@ func (kv *kv) Get(k string) ([]byte, error) {
 	return kv.m[k], nil
 }
 
+func (kv *kv) GetPrefix(pk string) (m map[string][]byte, err error) {
+	kv.mu.Lock()
+	defer kv.mu.Unlock()
+	m = make(map[string][]byte)
+	for k, v := range kv.m {
+		if strings.HasPrefix(k, pk) {
+			m[k] = v
+		}
+	}
+	return
+}
+
 func (kv *kv) Set(k string, v []byte) error {
 	if kv.r.State() != raft.Leader {
 		return ErrNotLeader