94 lines
2.3 KiB
Go
94 lines
2.3 KiB
Go
// Copyright 2018 Vulcanize
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package dent
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
)
|
|
|
|
type Converter interface {
|
|
ToModels(ethLogs []types.Log) ([]DentModel, error)
|
|
}
|
|
|
|
type DentConverter struct{}
|
|
|
|
func NewDentConverter() DentConverter {
|
|
return DentConverter{}
|
|
}
|
|
|
|
func (c DentConverter) ToModels(ethLogs []types.Log) (result []DentModel, err error) {
|
|
for _, log := range ethLogs {
|
|
err := validateLog(log)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
bidId := log.Topics[2].Big()
|
|
lot := log.Topics[3].Big().String()
|
|
bidValue := getBidValue(log)
|
|
guy := common.HexToAddress(log.Topics[1].Hex()).String()
|
|
tic := "0"
|
|
//TODO: it is likely that the tic value will need to be added to an emitted event,
|
|
//so this will need to be updated at that point
|
|
|
|
logIndex := log.Index
|
|
transactionIndex := log.TxIndex
|
|
|
|
raw, err := json.Marshal(log)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
model := DentModel{
|
|
BidId: bidId.String(),
|
|
Lot: lot,
|
|
Bid: bidValue,
|
|
Guy: guy,
|
|
Tic: tic,
|
|
LogIndex: logIndex,
|
|
TransactionIndex: transactionIndex,
|
|
Raw: raw,
|
|
}
|
|
result = append(result, model)
|
|
}
|
|
return result, err
|
|
}
|
|
|
|
func validateLog(ethLog types.Log) error {
|
|
if len(ethLog.Data) <= 0 {
|
|
return errors.New("dent log data is empty")
|
|
}
|
|
|
|
if len(ethLog.Topics) < 4 {
|
|
return errors.New("dent log does not contain expected topics")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func getBidValue(ethLog types.Log) string {
|
|
itemByteLength := 32
|
|
lastDataItemStartIndex := len(ethLog.Data) - itemByteLength
|
|
lastItem := ethLog.Data[lastDataItemStartIndex:]
|
|
lastValue := big.NewInt(0).SetBytes(lastItem)
|
|
|
|
return lastValue.String()
|
|
}
|