adding mapping urls

internal/hmyapi/blockchain.go

@@ -63,6 +63,33 @@ func (s *PublicBlockChainAPI) GetBlockByHash(ctx context.Context, blockHash comm
 	return nil, err
 }
 
+// GetShardingStructure returns an array of sharding structures.
+func (s *PublicBlockChainAPI) GetShardingStructure(ctx context.Context) ([]map[string]interface{}, error) {
+	res := []map[string]interface{}{
+		map[string]interface{}{
+			"shardID": "0",
+			"http":    "http://127.0.0.1:800",
+			"wss":     "wss://127.0.0.1:800",
+		},
+		map[string]interface{}{
+			"shardID": "1",
+			"http":    "http://127.0.0.1:800",
+			"wss":     "wss://127.0.0.1:800",
+		},
+		map[string]interface{}{
+			"shardID": "2",
+			"http":    "http://127.0.0.1:800",
+			"wss":     "wss://127.0.0.1:800",
+		},
+		map[string]interface{}{
+			"shardID": "3",
+			"http":    "http://127.0.0.1:800",
+			"wss":     "wss://127.0.0.1:800",
+		},
+	}
+	return res, nil
+}
+
 // GetCode returns the code stored at the given address in the state for the given block number.
 func (s *PublicBlockChainAPI) GetCode(ctx context.Context, addr string, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
 	address := internal_common.ParseAddr(addr)