70 lines
2.1 KiB
Go
70 lines
2.1 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 fetcher
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import (
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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)
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type Fetcher interface {
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FetchLogs(contractAddresses []string, topics []common.Hash, missingHeader core.Header) ([]types.Log, error)
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}
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type fetcher struct {
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blockChain core.BlockChain
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}
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func NewFetcher(blockchain core.BlockChain) *fetcher {
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return &fetcher{
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blockChain: blockchain,
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}
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}
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// Checks all topic0s, on all addresses, fetching matching logs for the given header
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func (fetcher *fetcher) FetchLogs(contractAddresses []string, topic0s []common.Hash, header core.Header) ([]types.Log, error) {
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addresses := hexStringsToAddresses(contractAddresses)
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blockHash := common.HexToHash(header.Hash)
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query := ethereum.FilterQuery{
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BlockHash: &blockHash,
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Addresses: addresses,
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// Search for _any_ of the topics in topic0 position; see docs on `FilterQuery`
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Topics: [][]common.Hash{topic0s},
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}
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logs, err := fetcher.blockChain.GetEthLogsWithCustomQuery(query)
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if err != nil {
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// TODO review aggregate fetching error handling
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return []types.Log{}, err
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}
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return logs, nil
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}
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func hexStringsToAddresses(hexStrings []string) []common.Address {
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var addresses []common.Address
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for _, hexString := range hexStrings {
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address := common.HexToAddress(hexString)
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addresses = append(addresses, address)
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}
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return addresses
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}
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