Adding a method to get the latest height

generate_block.sh

@@ -10,5 +10,5 @@ while :
 do
         echo "Generate a new block `date '+%d/%m/%Y %H:%M:%S'`"
         bitcoin-core.cli -regtest -rpcport=18332 -rpcuser=rpcuser -rpcpassword=rpcpass generatetoaddress 1 $address
-        sleep 5
+        sleep 1
 done

relayer.go

@@ -312,6 +312,14 @@ func (r Relayer) ReadTransaction(hash *chainhash.Hash) ([]byte, error) {
 	return nil, nil
 }
 
+func (r Relayer) LatestHeight() (int64, error) {
+	latest, err := r.client.GetBlockCount()
+	if err != nil {
+		return -1, err
+	}
+	return latest, nil
+}
+
 func (r Relayer) Read(height uint64) ([][]byte, error) {
 	hash, err := r.client.GetBlockHash(int64(height))
 	if err != nil {