64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
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package vat_grab
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import (
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"bytes"
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"encoding/json"
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"errors"
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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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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
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"math/big"
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)
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type Converter interface {
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ToModels(ethLogs []types.Log) ([]VatGrabModel, error)
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}
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type VatGrabConverter struct{}
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func (VatGrabConverter) ToModels(ethLogs []types.Log) ([]VatGrabModel, error) {
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var models []VatGrabModel
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for _, ethLog := range ethLogs {
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err := verifyLog(ethLog)
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if err != nil {
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return nil, err
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}
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ilk := string(bytes.Trim(ethLog.Topics[1].Bytes(), "\x00"))
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urn := common.BytesToAddress(ethLog.Topics[2].Bytes()[:common.AddressLength])
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v := common.BytesToAddress(ethLog.Topics[3].Bytes()[:common.AddressLength])
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wBytes := shared.GetDataBytesAtIndex(-3, ethLog.Data)
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w := common.BytesToAddress(wBytes[:common.AddressLength])
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dinkBytes := shared.GetDataBytesAtIndex(-2, ethLog.Data)
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dink := big.NewInt(0).SetBytes(dinkBytes).String()
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dartBytes := shared.GetDataBytesAtIndex(-1, ethLog.Data)
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dart := big.NewInt(0).SetBytes(dartBytes).String()
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raw, err := json.Marshal(ethLog)
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if err != nil {
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return nil, err
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}
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model := VatGrabModel{
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Ilk: ilk,
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Urn: urn.String(),
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V: v.String(),
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W: w.String(),
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Dink: dink,
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Dart: dart,
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TransactionIndex: ethLog.TxIndex,
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Raw: raw,
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}
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models = append(models, model)
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}
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return models, nil
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}
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func verifyLog(log types.Log) error {
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if len(log.Topics) < 4 {
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return errors.New("log missing topics")
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}
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if len(log.Data) < shared.DataItemLength {
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return errors.New("log missing data")
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}
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return nil
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}
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