New args types with stricter checking

rpc/api.go

@@ -108,15 +108,15 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		count := api.xethAtStateNum(args.BlockNumber).TxCountAt(args.Address)
 		*reply = common.ToHex(big.NewInt(int64(count)).Bytes())
 	case "eth_getBlockTransactionCountByHash":
-		args := new(GetBlockByHashArgs)
+		args := new(HashArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
 
-		block := NewBlockRes(api.xeth().EthBlockByHash(args.BlockHash), false)
+		block := NewBlockRes(api.xeth().EthBlockByHash(args.Hash), false)
 		*reply = common.ToHex(big.NewInt(int64(len(block.Transactions))).Bytes())
 	case "eth_getBlockTransactionCountByNumber":
-		args := new(GetBlockByNumberArgs)
+		args := new(BlockNumArg)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
@@ -124,16 +124,16 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		block := NewBlockRes(api.xeth().EthBlockByNumber(args.BlockNumber), false)
 		*reply = common.ToHex(big.NewInt(int64(len(block.Transactions))).Bytes())
 	case "eth_getUncleCountByBlockHash":
-		args := new(GetBlockByHashArgs)
+		args := new(HashArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
 
-		block := api.xeth().EthBlockByHash(args.BlockHash)
+		block := api.xeth().EthBlockByHash(args.Hash)
 		br := NewBlockRes(block, false)
 		*reply = common.ToHex(big.NewInt(int64(len(br.Uncles))).Bytes())
 	case "eth_getUncleCountByBlockNumber":
-		args := new(GetBlockByNumberArgs)
+		args := new(BlockNumArg)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}

rpc/args.go

@@ -108,8 +108,8 @@ func (args *GetBlockByHashArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	if len(obj) < 1 {
-		return NewInsufficientParamsError(len(obj), 1)
+	if len(obj) < 2 {
+		return NewInsufficientParamsError(len(obj), 2)
 	}
 
 	argstr, ok := obj[0].(string)
@@ -118,9 +118,7 @@ func (args *GetBlockByHashArgs) UnmarshalJSON(b []byte) (err error) {
 	}
 	args.BlockHash = argstr
 
-	if len(obj) > 1 {
-		args.IncludeTxs = obj[1].(bool)
-	}
+	args.IncludeTxs = obj[1].(bool)
 
 	return nil
 }
@@ -136,8 +134,8 @@ func (args *GetBlockByNumberArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	if len(obj) < 1 {
-		return NewInsufficientParamsError(len(obj), 1)
+	if len(obj) < 2 {
+		return NewInsufficientParamsError(len(obj), 2)
 	}
 
 	if v, ok := obj[0].(float64); ok {
@@ -148,9 +146,7 @@ func (args *GetBlockByNumberArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewInvalidTypeError("blockNumber", "not a number or string")
 	}
 
-	if len(obj) > 1 {
-		args.IncludeTxs = obj[1].(bool)
-	}
+	args.IncludeTxs = obj[1].(bool)
 
 	return nil
 }
@@ -496,6 +492,27 @@ func (args *GetDataArgs) UnmarshalJSON(b []byte) (err error) {
 	return nil
 }
 
+type BlockNumArg struct {
+	BlockNumber int64
+}
+
+func (args *BlockNumArg) UnmarshalJSON(b []byte) (err error) {
+	var obj []interface{}
+	if err := json.Unmarshal(b, &obj); err != nil {
+		return NewDecodeParamError(err.Error())
+	}
+
+	if len(obj) < 1 {
+		return NewInsufficientParamsError(len(obj), 1)
+	}
+
+	if err := blockHeight(obj[0], &args.BlockNumber); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 type BlockNumIndexArgs struct {
 	BlockNumber int64
 	Index       int64
@@ -507,21 +524,42 @@ func (args *BlockNumIndexArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	if len(obj) < 1 {
-		return NewInsufficientParamsError(len(obj), 1)
+	if len(obj) < 2 {
+		return NewInsufficientParamsError(len(obj), 2)
 	}
 
 	if err := blockHeight(obj[0], &args.BlockNumber); err != nil {
 		return err
 	}
 
-	if len(obj) > 1 {
-		arg1, ok := obj[1].(string)
-		if !ok {
-			return NewInvalidTypeError("index", "not a string")
-		}
-		args.Index = common.Big(arg1).Int64()
+	arg1, ok := obj[1].(string)
+	if !ok {
+		return NewInvalidTypeError("index", "not a string")
 	}
+	args.Index = common.Big(arg1).Int64()
+
+	return nil
+}
+
+type HashArgs struct {
+	Hash string
+}
+
+func (args *HashArgs) UnmarshalJSON(b []byte) (err error) {
+	var obj []interface{}
+	if err := json.Unmarshal(b, &obj); err != nil {
+		return NewDecodeParamError(err.Error())
+	}
+
+	if len(obj) < 1 {
+		return NewInsufficientParamsError(len(obj), 1)
+	}
+
+	arg0, ok := obj[0].(string)
+	if !ok {
+		return NewInvalidTypeError("hash", "not a string")
+	}
+	args.Hash = arg0
 
 	return nil
 }
@@ -537,8 +575,8 @@ func (args *HashIndexArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	if len(obj) < 1 {
-		return NewInsufficientParamsError(len(obj), 1)
+	if len(obj) < 2 {
+		return NewInsufficientParamsError(len(obj), 2)
 	}
 
 	arg0, ok := obj[0].(string)
@@ -547,13 +585,11 @@ func (args *HashIndexArgs) UnmarshalJSON(b []byte) (err error) {
 	}
 	args.Hash = arg0
 
-	if len(obj) > 1 {
-		arg1, ok := obj[1].(string)
-		if !ok {
-			return NewInvalidTypeError("index", "not a string")
-		}
-		args.Index = common.Big(arg1).Int64()
+	arg1, ok := obj[1].(string)
+	if !ok {
+		return NewInvalidTypeError("index", "not a string")
 	}
+	args.Index = common.Big(arg1).Int64()
 
 	return nil
 }

rpc/args_test.go

@@ -225,7 +225,7 @@ func TestGetBlockByHashArgsHashInt(t *testing.T) {
 	input := `[8]`
 
 	args := new(GetBlockByHashArgs)
-	str := ExpectInvalidTypeError(json.Unmarshal([]byte(input), &args))
+	str := ExpectInsufficientParamsError(json.Unmarshal([]byte(input), &args))
 	if len(str) > 0 {
 		t.Error(str)
 	}
@@ -281,6 +281,16 @@ func TestGetBlockByNumberEmpty(t *testing.T) {
 	}
 }
 
+func TestGetBlockByNumberShort(t *testing.T) {
+	input := `["0xbbb"]`
+
+	args := new(GetBlockByNumberArgs)
+	str := ExpectInsufficientParamsError(json.Unmarshal([]byte(input), &args))
+	if len(str) > 0 {
+		t.Error(str)
+	}
+}
+
 func TestGetBlockByNumberBool(t *testing.T) {
 	input := `[true, true]`