118 lines
3.6 KiB
Go
118 lines
3.6 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 retriever
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/ethereum/go-ethereum/accounts/abi"
|
|
"github.com/ethereum/go-ethereum/common"
|
|
|
|
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
|
|
"github.com/vulcanize/vulcanizedb/pkg/omni/contract"
|
|
)
|
|
|
|
// Address retriever is used to retrieve the addresses associated with a contract
|
|
// It requires a vDB synced database with blocks, transactions, receipts, logs,
|
|
// AND all of the targeted events persisted
|
|
type AddressRetriever interface {
|
|
RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error)
|
|
}
|
|
|
|
type addressRetriever struct {
|
|
*postgres.DB
|
|
}
|
|
|
|
func NewAddressRetriever(db *postgres.DB) (r *addressRetriever) {
|
|
|
|
return &addressRetriever{
|
|
DB: db,
|
|
}
|
|
}
|
|
|
|
// Method to retrieve list of token-holding/contract-related addresses by iterating over available events
|
|
// This generic method should work whether or not the argument/input names of the events meet the expected standard
|
|
// This could be generalized to iterate over ALL events and pull out any address arguments
|
|
func (r *addressRetriever) RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error) {
|
|
addrList := make([]string, 0)
|
|
|
|
_, ok := info.Filters["Transfer"]
|
|
if ok {
|
|
addrs, err := r.retrieveTransferAddresses(info)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
addrList = append(addrList, addrs...)
|
|
}
|
|
|
|
_, ok = info.Filters["Mint"]
|
|
if ok {
|
|
addrs, err := r.retrieveTokenMintees(info)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
addrList = append(addrList, addrs...)
|
|
}
|
|
|
|
contractAddresses := make(map[common.Address]bool)
|
|
for _, addr := range addrList {
|
|
contractAddresses[common.HexToAddress(addr)] = true
|
|
}
|
|
|
|
return contractAddresses, nil
|
|
}
|
|
|
|
func (r *addressRetriever) retrieveTransferAddresses(contract contract.Contract) ([]string, error) {
|
|
transferAddrs := make([]string, 0)
|
|
event := contract.Events["Transfer"]
|
|
|
|
for _, field := range event.Fields { // Iterate over event fields, finding the ones with address type
|
|
|
|
if field.Type.T == abi.AddressTy { // If they have address type, retrieve those addresses
|
|
addrs := make([]string, 0)
|
|
pgStr := fmt.Sprintf("SELECT _%s FROM %s.%s", field.Name, contract.Name, event.Name)
|
|
err := r.DB.Select(&addrs, pgStr)
|
|
if err != nil {
|
|
return []string{}, err
|
|
}
|
|
|
|
transferAddrs = append(transferAddrs, addrs...) // And append them to the growing list
|
|
}
|
|
}
|
|
|
|
return transferAddrs, nil
|
|
}
|
|
|
|
func (r *addressRetriever) retrieveTokenMintees(contract contract.Contract) ([]string, error) {
|
|
mintAddrs := make([]string, 0)
|
|
event := contract.Events["Mint"]
|
|
|
|
for _, field := range event.Fields { // Iterate over event fields, finding the ones with address type
|
|
|
|
if field.Type.T == abi.AddressTy { // If they have address type, retrieve those addresses
|
|
addrs := make([]string, 0)
|
|
pgStr := fmt.Sprintf("SELECT _%s FROM %s.%s", field.Name, contract.Name, event.Name)
|
|
err := r.DB.Select(&addrs, pgStr)
|
|
if err != nil {
|
|
return []string{}, err
|
|
}
|
|
|
|
mintAddrs = append(mintAddrs, addrs...) // And append them to the growing list
|
|
}
|
|
}
|
|
|
|
return mintAddrs, nil
|
|
}
|