ipld-eth-server/pkg/transformers/flip_kick/converter.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 flip_kick

import (
	"encoding/json"
	"errors"
	"time"

	"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 Converter interface {
	ToEntities(contractAbi string, ethLogs []types.Log) ([]FlipKickEntity, error)
	ToModels(flipKicks []FlipKickEntity) ([]FlipKickModel, error)
}

type FlipKickConverter struct{}

func (FlipKickConverter) ToEntities(contractAbi string, ethLogs []types.Log) (results []FlipKickEntity, err error) {
	for _, ethLog := range ethLogs {
		entity := &FlipKickEntity{}
		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, "Kick", ethLog)
		if err != nil {
			return nil, err
		}
		entity.Raw = ethLog
		entity.TransactionIndex = ethLog.TxIndex
		results = append(results, *entity)
	}

	return results, nil
}

func (FlipKickConverter) ToModels(flipKicks []FlipKickEntity) (results []FlipKickModel, err error) {
	for _, flipKick := range flipKicks {
		if flipKick.Id == nil {
			return nil, errors.New("FlipKick log ID cannot be nil.")
		}

		id := flipKick.Id.String()
		lot := shared.BigIntToString(flipKick.Lot)
		bid := shared.BigIntToString(flipKick.Bid)
		gal := flipKick.Gal.String()
		endValue := shared.BigIntToInt64(flipKick.End)
		end := time.Unix(endValue, 0)
		urn := common.BytesToAddress(flipKick.Urn[:common.AddressLength]).String()
		tab := shared.BigIntToString(flipKick.Tab)
		rawLogJson, err := json.Marshal(flipKick.Raw)
		if err != nil {
			return nil, err
		}
		rawLogString := string(rawLogJson)

		model := FlipKickModel{
			BidId:            id,
			Lot:              lot,
			Bid:              bid,
			Gal:              gal,
			End:              end,
			Urn:              urn,
			Tab:              tab,
			TransactionIndex: flipKick.TransactionIndex,
			Raw:              rawLogString,
		}
		results = append(results, model)
	}
	return results, err
}