ipld-eth-server/libraries/shared/fetcher/log_fetcher.go

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// VulcanizeDB
// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package fetcher
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import (
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
type ILogFetcher interface {
FetchLogs(contractAddresses []common.Address, topics []common.Hash, missingHeader core.Header) ([]types.Log, error)
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}
type LogFetcher struct {
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blockChain core.BlockChain
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}
func NewLogFetcher(blockchain core.BlockChain) *LogFetcher {
return &LogFetcher{
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blockChain: blockchain,
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}
}
// Checks all topic0s, on all addresses, fetching matching logs for the given header
func (logFetcher LogFetcher) FetchLogs(addresses []common.Address, topic0s []common.Hash, header core.Header) ([]types.Log, error) {
blockHash := common.HexToHash(header.Hash)
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query := ethereum.FilterQuery{
BlockHash: &blockHash,
Addresses: addresses,
// Search for _any_ of the topics in topic0 position; see docs on `FilterQuery`
Topics: [][]common.Hash{topic0s},
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}
logs, err := logFetcher.blockChain.GetEthLogsWithCustomQuery(query)
if err != nil {
// TODO review aggregate fetching error handling
return []types.Log{}, err
}
return logs, nil
}