forked from cerc-io/ipld-eth-server
85 lines
2.3 KiB
Go
85 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 ilk
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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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"math/big"
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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 PitFileIlkConverter struct{}
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func (PitFileIlkConverter) 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[2].Bytes(), "\x00"))
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what := string(bytes.Trim(ethLog.Topics[3].Bytes(), "\x00"))
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dataBytes := ethLog.Data[len(ethLog.Data)-constants.DataItemLength:]
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data, err := getData(dataBytes, what)
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if err != nil {
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return nil, err
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}
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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 := PitFileIlkModel{
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Ilk: ilk,
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What: what,
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Data: data,
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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 getData(dataBytes []byte, what string) (string, error) {
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n := big.NewInt(0).SetBytes(dataBytes).String()
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if what == "spot" {
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return shared.ConvertToRay(n), nil
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} else if what == "line" {
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return shared.ConvertToWad(n), nil
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} else {
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return "", errors.New("unexpected payload for 'what'")
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}
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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) < constants.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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