forked from cerc-io/ipld-eth-server
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
// 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 vat_fold
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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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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
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)
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type VatFoldConverter struct{}
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func (VatFoldConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
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var models []interface{}
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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()).String()
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rate := shared.ConvertToRay(ethLog.Topics[3].Big().String())
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raw, err := json.Marshal(ethLog)
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if err != nil {
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return models, err
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}
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model := VatFoldModel{
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Ilk: ilk,
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Urn: urn,
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Rate: rate,
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LogIndex: ethLog.Index,
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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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sig := log.Topics[0].String()
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if sig != constants.VatFoldSignature {
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return errors.New("log is not a Vat.fold event")
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}
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return nil
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}
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