122 lines
4.0 KiB
Go
122 lines
4.0 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package retriever
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import (
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"fmt"
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"strings"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/ethereum/go-ethereum/common"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/contract"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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)
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// AddressRetriever is used to retrieve the addresses associated with a contract
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type AddressRetriever interface {
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RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error)
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}
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type addressRetriever struct {
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db *postgres.DB
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mode types.Mode
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}
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// NewAddressRetriever returns a new AddressRetriever
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func NewAddressRetriever(db *postgres.DB, mode types.Mode) AddressRetriever {
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return &addressRetriever{
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db: db,
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mode: mode,
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}
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}
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// RetrieveTokenHolderAddresses is used to retrieve list of token-holding/contract-related addresses by iterating over available events
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// This generic method should work whether or not the argument/input names of the events meet the expected standard
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// This could be generalized to iterate over ALL events and pull out any address arguments
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func (r *addressRetriever) RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error) {
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addrList := make([]string, 0)
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_, ok := info.Filters["Transfer"]
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if ok {
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addrs, err := r.retrieveTransferAddresses(info)
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if err != nil {
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return nil, err
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}
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addrList = append(addrList, addrs...)
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}
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_, ok = info.Filters["Mint"]
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if ok {
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addrs, err := r.retrieveTokenMintees(info)
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if err != nil {
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return nil, err
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}
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addrList = append(addrList, addrs...)
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}
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contractAddresses := make(map[common.Address]bool)
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for _, addr := range addrList {
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contractAddresses[common.HexToAddress(addr)] = true
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}
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return contractAddresses, nil
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}
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func (r *addressRetriever) retrieveTransferAddresses(con contract.Contract) ([]string, error) {
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transferAddrs := make([]string, 0)
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event := con.Events["Transfer"]
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for _, field := range event.Fields { // Iterate over event fields, finding the ones with address type
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if field.Type.T == abi.AddressTy { // If they have address type, retrieve those addresses
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addrs := make([]string, 0)
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pgStr := fmt.Sprintf("SELECT %s_ FROM %s_%s.%s_event", strings.ToLower(field.Name), r.mode.String(), strings.ToLower(con.Address), strings.ToLower(event.Name))
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err := r.db.Select(&addrs, pgStr)
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if err != nil {
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return []string{}, err
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}
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transferAddrs = append(transferAddrs, addrs...) // And append them to the growing list
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}
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}
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return transferAddrs, nil
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}
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func (r *addressRetriever) retrieveTokenMintees(con contract.Contract) ([]string, error) {
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mintAddrs := make([]string, 0)
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event := con.Events["Mint"]
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for _, field := range event.Fields { // Iterate over event fields, finding the ones with address type
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if field.Type.T == abi.AddressTy { // If they have address type, retrieve those addresses
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addrs := make([]string, 0)
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pgStr := fmt.Sprintf("SELECT %s_ FROM %s_%s.%s_event", strings.ToLower(field.Name), r.mode.String(), strings.ToLower(con.Address), strings.ToLower(event.Name))
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err := r.db.Select(&addrs, pgStr)
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if err != nil {
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return []string{}, err
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}
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mintAddrs = append(mintAddrs, addrs...) // And append them to the growing list
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}
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}
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return mintAddrs, nil
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}
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