ipld-eth-server/pkg/transformers/vat_fold/converter.go
Rob Mulholand 8c168ed332 Extract constants package
- Reduce clutter in the shared package
2018-11-08 13:08:59 -06:00

71 lines
1.8 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 vat_fold
import (
"bytes"
"encoding/json"
"errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
)
type VatFoldConverter struct{}
func (VatFoldConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
var models []interface{}
for _, ethLog := range ethLogs {
err := verifyLog(ethLog)
if err != nil {
return nil, err
}
ilk := string(bytes.Trim(ethLog.Topics[1].Bytes(), "\x00"))
urn := common.BytesToAddress(ethLog.Topics[2].Bytes()).String()
rate := ethLog.Topics[3].Big().String()
raw, err := json.Marshal(ethLog)
if err != nil {
return models, err
}
model := VatFoldModel{
Ilk: ilk,
Urn: urn,
Rate: rate,
LogIndex: ethLog.Index,
TransactionIndex: ethLog.TxIndex,
Raw: raw,
}
models = append(models, model)
}
return models, nil
}
func verifyLog(log types.Log) error {
if len(log.Topics) < 4 {
return errors.New("log missing topics")
}
sig := log.Topics[0].String()
if sig != constants.VatFoldSignature {
return errors.New("log is not a Vat.fold event")
}
return nil
}