ipld-eth-server/pkg/transformers/shared/event_signature_generator.go
Rob Mulholand a843de5eb7 Add drip file transformers
- for all three file functions on the drip contract
2018-09-12 11:35:32 -05:00

59 lines
1.6 KiB
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 shared
import (
"fmt"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/crypto"
"github.com/vulcanize/vulcanizedb/pkg/geth"
)
func GetEventSignature(solidityMethodSignature string) string {
eventSignature := []byte(solidityMethodSignature)
hash := crypto.Keccak256Hash(eventSignature)
return hash.Hex()
}
func GetLogNoteSignature(solidityMethodSignature string) string {
rawSignature := GetEventSignature(solidityMethodSignature)
return rawSignature[:10] + "00000000000000000000000000000000000000000000000000000000"
}
func GetSolidityMethodSignature(abi, name string) string {
parsedAbi, _ := geth.ParseAbi(abi)
if method, ok := parsedAbi.Methods[name]; ok {
return method.Sig()
} else if event, ok := parsedAbi.Events[name]; ok {
return getEventSignature(event)
}
return ""
}
func getEventSignature(event abi.Event) string {
types := make([]string, len(event.Inputs))
for i, input := range event.Inputs {
types[i] = input.Type.String()
i++
}
return fmt.Sprintf("%v(%v)", event.Name, strings.Join(types, ","))
}