ipld-eth-server/pkg/omni/helpers/helpers.go

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// 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 helpers
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
func ConvertToLog(watchedEvent core.WatchedEvent) types.Log {
allTopics := []string{watchedEvent.Topic0, watchedEvent.Topic1, watchedEvent.Topic2, watchedEvent.Topic3}
var nonNilTopics []string
for _, topic := range allTopics {
if topic != "" {
nonNilTopics = append(nonNilTopics, topic)
}
}
return types.Log{
Address: common.HexToAddress(watchedEvent.Address),
Topics: createTopics(nonNilTopics...),
Data: hexutil.MustDecode(watchedEvent.Data),
BlockNumber: uint64(watchedEvent.BlockNumber),
TxHash: common.HexToHash(watchedEvent.TxHash),
TxIndex: 0,
BlockHash: common.HexToHash("0x0"),
Index: uint(watchedEvent.Index),
Removed: false,
}
}
func createTopics(topics ...string) []common.Hash {
var topicsArray []common.Hash
for _, topic := range topics {
topicsArray = append(topicsArray, common.HexToHash(topic))
}
return topicsArray
}
func BigFromString(n string) *big.Int {
b := new(big.Int)
b.SetString(n, 10)
return b
}
func GenerateSignature(s string) string {
eventSignature := []byte(s)
hash := crypto.Keccak256Hash(eventSignature)
return hash.Hex()
}