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parser.go
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/
parser.go
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package tron
import (
"strconv"
"strings"
"github.com/fbsobreira/gotron-sdk/pkg/address"
"github.com/fbsobreira/gotron-sdk/pkg/common"
"github.com/fbsobreira/gotron-sdk/pkg/proto/core"
"github.com/pkg/errors"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
)
const (
methodIDLength = 8 // method length
addressLength = 64 // address length
valueLength = 64 // Amount length
valueLength2 = 62 // Amount length Another unexpected value length
valueStartIndex = methodIDLength + addressLength // method + address value start position && Length without value (zero trc20 rotated)
trc20Length = methodIDLength + addressLength + valueLength // full length
)
var Parser = newParser()
type parser struct{}
func newParser() *parser {
return &parser{}
}
func (inst *parser) SmartContractEvent(transaction *core.Transaction) (contractEvent *SmartContractEvent, err error) {
contracts := transaction.GetRawData().GetContract()
if len(contracts) == 0 {
err = errors.New("tx has no contract")
return
}
params := contracts[0].GetParameter()
message, err := anypb.UnmarshalNew(params, proto.UnmarshalOptions{})
if err != nil {
err = errors.Errorf("Error unmarshaling Any message: %v", err)
return
}
tsc, ok := message.(*core.TriggerSmartContract)
if !ok {
err = errors.New("msg is not TriggerSmartContract")
return
}
method, to, value, err := inst.ContractInput(common.Bytes2Hex(tsc.GetData()))
if err != nil {
err = errors.New("parse contract input fail")
return
}
owner := address.HexToAddress(common.Bytes2Hex(tsc.GetOwnerAddress())).String()
contract := address.HexToAddress(common.Bytes2Hex(tsc.GetContractAddress())).String()
contractEvent = &SmartContractEvent{
Contract: Address(contract),
Owner: Address(owner),
To: to,
Amount: value,
Method: method,
}
return
}
func (inst *parser) ContractInput(data string) (method ContractMethod, to Address, value SUN, err error) {
dataLen := len(data)
if dataLen <= methodIDLength {
err = errors.New("data length to less")
return
}
method, err = ContractMethodFromStr(data[:methodIDLength])
if err != nil {
method, err = ContractMethod(0), nil
}
if dataLen >= methodIDLength+addressLength+valueLength {
addr, v, e := inst.getAddressValueFromData(
data[methodIDLength:methodIDLength+addressLength],
data[methodIDLength+addressLength:methodIDLength+addressLength+valueLength],
)
to, value, err = Address(addr), SUN(v), e
return
}
if dataLen == methodIDLength+addressLength+valueLength-2 {
addr, v, e := inst.getAddressValueFromData(
data[methodIDLength:methodIDLength+addressLength],
data[methodIDLength+addressLength:]+`00`,
)
to, value, err = Address(addr), SUN(v), e
return
}
// Collect other encoding information.
if dataLen != methodIDLength+addressLength+valueLength &&
dataLen != methodIDLength+addressLength+valueLength+2 && // Unknown reason for the extra length.
dataLen != methodIDLength+addressLength+valueLength+4 && // Unknown reason for the extra length.
dataLen != methodIDLength+addressLength+valueLength+6 && // Unknown reason for the extra length.
dataLen != methodIDLength+addressLength+valueLength+8 && // Unknown reason for the extra length.
dataLen != methodIDLength+42 { // Short amount: Method + Address + Amount (missing 2 characters).
// localLog.Error(`UnpackTransfer original data encoding length not in parsing range`, zap.Int(`length`, dataLen), zap.String(`original data`, data))
return ContractMethod(0), ``, 0, errors.New("UnpackTransfer original data encoding length error")
}
return
}
func (inst *parser) getAddressValueFromData(addressData, valueData string) (address string, value int64, err error) {
if address, err = inst.getAddressFromData(addressData); err != nil {
return "", 0, err
}
if value, err = inst.getValueFromData(valueData); err != nil {
return "", 0, err
}
return
}
// Parse address from raw data.
func (inst *parser) getAddressFromData(s string) (string, error) {
s = "41" + s[24:] // Must start with "41".
addr, err := common.Hex2Bytes(s)
if err != nil {
return "", errors.Wrapf(err, "Error parsing address from Hex[%s]", s)
}
s = common.EncodeCheck(addr)
return s, nil
}
// Parse value from raw data.
func (inst *parser) getValueFromData(s string) (int64, error) {
amount := strings.TrimLeft(s, "0")
if amount == `` {
return 0, nil
}
value, err := strconv.ParseInt(amount, 16, 64)
if err != nil {
return 0, errors.Wrapf(err, "Error parsing value[%s]", s)
}
return value, nil
}