forked from cerc-io/ipld-eth-server
89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
// VulcanizeDB
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// Copyright © 2018 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 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) ToModels(ethLogs []types.Log) (result []interface{}, err error) {
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for _, log := range ethLogs {
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err := validateLog(log)
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if err != nil {
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return nil, err
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}
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bidId := log.Topics[2].Big()
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lot := log.Topics[3].Big().String()
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bidValue := getBidValue(log)
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// TODO: verify guy is available on Topics[1] (looks like it may just be an int id)
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guy := common.HexToAddress(log.Topics[1].Hex()).String()
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logIndex := log.Index
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transactionIndex := log.TxIndex
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raw, err := json.Marshal(log)
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if err != nil {
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return nil, err
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}
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model := 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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LogIndex: logIndex,
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TransactionIndex: transactionIndex,
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Raw: raw,
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}
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result = append(result, model)
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}
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return result, err
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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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