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