127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
// Copyright 2018 Vulcanize
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package generic
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"log"
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)
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// Retriever is used to iterate over addresses going into or out of a contract
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// address in an attempt to generate a list of token holder addresses
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type RetrieverInterface interface {
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RetrieveSendingAddresses() ([]string, error)
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RetrieveReceivingAddresses() ([]string, error)
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RetrieveContractAssociatedAddresses() (map[common.Address]bool, error)
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}
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type Retriever struct {
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Database *postgres.DB
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ContractAddress string
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}
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type retrieverError struct {
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err string
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msg string
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address string
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}
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// Retriever error method
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func (re *retrieverError) Error() string {
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return fmt.Sprintf(re.msg, re.address, re.err)
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}
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// Used to create a new retriever error for a given error and fetch method
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func newRetrieverError(err error, msg string, address string) error {
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e := retrieverError{err.Error(), msg, address}
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log.Println(e.Error())
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return &e
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}
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// Constant error definitions
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const (
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GetSenderError = "Error fetching addresses receiving from contract %s: %s"
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GetReceiverError = "Error fetching addresses sending to contract %s: %s"
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)
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func NewRetriever(db *postgres.DB, address string) Retriever {
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return Retriever{
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Database: db,
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ContractAddress: address,
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}
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}
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func (rt Retriever) RetrieveReceivingAddresses() ([]string, error) {
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receiversFromContract := make([]string, 0)
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err := rt.Database.DB.Select(
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&receiversFromContract,
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`SELECT tx_to FROM TRANSACTIONS
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WHERE tx_from = $1
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LIMIT 20`,
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rt.ContractAddress,
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)
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if err != nil {
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return []string{}, newRetrieverError(err, GetReceiverError, rt.ContractAddress)
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}
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return receiversFromContract, err
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}
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func (rt Retriever) RetrieveSendingAddresses() ([]string, error) {
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sendersToContract := make([]string, 0)
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err := rt.Database.DB.Select(
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&sendersToContract,
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`SELECT tx_from FROM TRANSACTIONS
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WHERE tx_to = $1
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LIMIT 20`,
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rt.ContractAddress,
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)
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if err != nil {
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return []string{}, newRetrieverError(err, GetSenderError, rt.ContractAddress)
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}
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return sendersToContract, err
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}
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func (rt Retriever) RetrieveContractAssociatedAddresses() (map[common.Address]bool, error) {
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sending, err := rt.RetrieveSendingAddresses()
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if err != nil {
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return nil, err
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}
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receiving, err := rt.RetrieveReceivingAddresses()
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if err != nil {
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return nil, err
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}
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contractAddresses := make(map[common.Address]bool)
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for _, addr := range sending {
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contractAddresses[common.HexToAddress(addr)] = true
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}
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for _, addr := range receiving {
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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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