ipld-eth-server/pkg/transformers/bite/converter.go

// VulcanizeDB
// Copyright © 2018 Vulcanize

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package bite

import (
	"encoding/json"
	"fmt"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/vulcanize/vulcanizedb/pkg/geth"
	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
)

type BiteConverter struct{}

func (BiteConverter) ToEntities(contractAbi string, ethLogs []types.Log) ([]interface{}, error) {
	var entities []interface{}
	for _, ethLog := range ethLogs {
		entity := &BiteEntity{}
		address := ethLog.Address
		abi, err := geth.ParseAbi(contractAbi)
		if err != nil {
			return nil, err
		}

		contract := bind.NewBoundContract(address, abi, nil, nil, nil)

		err = contract.UnpackLog(entity, "Bite", ethLog)
		if err != nil {
			return nil, err
		}

		entity.Raw = ethLog
		entity.LogIndex = ethLog.Index
		entity.TransactionIndex = ethLog.TxIndex

		entities = append(entities, *entity)
	}

	return entities, nil
}

func (converter BiteConverter) ToModels(entities []interface{}) ([]interface{}, error) {
	var models []interface{}
	for _, entity := range entities {
		biteEntity, ok := entity.(BiteEntity)
		if !ok {
			return nil, fmt.Errorf("entity of type %T, not %T", entity, BiteEntity{})
		}

		ilk := common.Bytes2Hex(biteEntity.Ilk[:])
		urn := common.BytesToAddress(biteEntity.Urn[:]).String()
		ink := biteEntity.Ink
		art := biteEntity.Art
		iArt := biteEntity.IArt
		tab := biteEntity.Tab
		flip := biteEntity.Flip
		logIdx := biteEntity.LogIndex
		txIdx := biteEntity.TransactionIndex
		rawLog, err := json.Marshal(biteEntity.Raw)
		if err != nil {
			return nil, err
		}

		model := BiteModel{
			Ilk:              ilk,
			Urn:              urn,
			Ink:              shared.BigIntToString(ink),
			Art:              shared.BigIntToString(art),
			IArt:             shared.BigIntToString(iArt),
			Tab:              shared.BigIntToString(tab),
			NFlip:            shared.BigIntToString(flip),
			LogIndex:         logIdx,
			TransactionIndex: txIdx,
			Raw:              rawLog,
		}
		models = append(models, model)
	}
	return models, nil
}