neoneo-go/pkg/core/transaction/attribute.go
dauTT 19201dcf52 Implemented rpc server method GetRawTransaction (#135)
* Added utility function GetVarSize

* 1) Added Size method: this implied that Fixed8 implements now the serializable interface. 2) Added few arithmetic operation (Add, Sub, div): this will be used to calculated networkfeeand feePerByte. Changed return value of the Value() method to int instead of int64. Modified fixed8_test accordingly.

* Implemented Size or MarshalJSON method.
- Structs accepting the Size method implement the serializable interface.
- Structs accepting the MarshalJSON method implements the customized json marshaller interface.

* Added fee calculation

* Implemented rcp server method GetRawTransaction

* Updated Tests

* Fixed:
1) NewFixed8 will accept as input int64
2) race condition affecting configDeafault, blockchainDefault

* Simplified Size calculation

* 1) Removed global variable blockchainDefault, configDefault
2) Extended Blockchainer interface to include the methods: References, FeePerByte, SystemFee, NetworkFee
3) Deleted fee_test.go, fee.go. Moved corresponding methods to blockchain_test.go and blockchain.go respectively
4) Amended tx_raw_output.go

* Simplified GetVarSize Method

* Replaced ValueAtAndType with ValueWithType

* Cosmetic changes + Added test case getrawtransaction_7

* Clean up Print statement

* Filled up keys

* Aligned verbose logic with the C#-neo implementation

* Implemented @Kim requests
Refactor server_test.go

* Small fixes

* Fixed verbose logic
Added more tests
Cosmetic changes

* Replaced assert.NoError with require.NoError

* Fixed tests by adding context.Background() as argument

* Fixed tests
2019-02-20 18:39:32 +01:00

104 lines
3.2 KiB
Go

package transaction
import (
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"github.com/CityOfZion/neo-go/pkg/util"
)
// Attribute represents a Transaction attribute.
type Attribute struct {
Usage AttrUsage
Data []byte
}
// DecodeBinary implements the Payload interface.
func (attr *Attribute) DecodeBinary(r io.Reader) error {
if err := binary.Read(r, binary.LittleEndian, &attr.Usage); err != nil {
return err
}
if attr.Usage == ContractHash ||
attr.Usage == Vote ||
(attr.Usage >= Hash1 && attr.Usage <= Hash15) {
attr.Data = make([]byte, 32)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == ECDH02 || attr.Usage == ECDH03 {
attr.Data = make([]byte, 33)
attr.Data[0] = byte(attr.Usage)
return binary.Read(r, binary.LittleEndian, attr.Data[1:])
}
if attr.Usage == Script {
attr.Data = make([]byte, 20)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == DescriptionURL {
attr.Data = make([]byte, 1)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == Description || attr.Usage >= Remark {
lenData := util.ReadVarUint(r)
attr.Data = make([]byte, lenData)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
return fmt.Errorf("failed decoding TX attribute usage: 0x%2x", attr.Usage)
}
// EncodeBinary implements the Payload interface.
func (attr *Attribute) EncodeBinary(w io.Writer) error {
if err := binary.Write(w, binary.LittleEndian, &attr.Usage); err != nil {
return err
}
if attr.Usage == ContractHash ||
attr.Usage == Vote ||
(attr.Usage >= Hash1 && attr.Usage <= Hash15) {
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == ECDH02 || attr.Usage == ECDH03 {
attr.Data[0] = byte(attr.Usage)
return binary.Write(w, binary.LittleEndian, attr.Data[1:33])
}
if attr.Usage == Script {
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == DescriptionURL {
if err := util.WriteVarUint(w, uint64(len(attr.Data))); err != nil {
return err
}
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == Description || attr.Usage >= Remark {
if err := util.WriteVarUint(w, uint64(len(attr.Data))); err != nil {
return err
}
return binary.Write(w, binary.LittleEndian, attr.Data)
}
return fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Usage)
}
// Size returns the size in number bytes of the Attribute
func (attr *Attribute) Size() int {
switch attr.Usage {
case ContractHash, ECDH02, ECDH03, Vote,
Hash1, Hash2, Hash3, Hash4, Hash5, Hash6, Hash7, Hash8, Hash9, Hash10, Hash11, Hash12, Hash13, Hash14, Hash15:
return 33 // uint8 + 32 = size(attrUsage) + 32
case Script:
return 21 // uint8 + 20 = size(attrUsage) + 20
case Description:
return 2 + len(attr.Data) // uint8 + uint8+ len of data = size(attrUsage) + size(byte) + len of data
default:
return 1 + len(attr.Data) // uint8 + len of data = size(attrUsage) + len of data
}
}
// MarshalJSON implements the json Marschaller interface
func (attr *Attribute) MarshalJSON() ([]byte, error) {
return json.Marshal(map[string]string{
"usage": attr.Usage.String(),
"data": hex.EncodeToString(attr.Data),
})
}