ipld-eth-server/libraries/shared/fetcher/log_fetcher.go
Rob Mulholand d496dad33c Decouple log extraction from transformer delegation
- limit missing headers results set to 100 so that extraction doesn't
  excessively block delegation
- wrap checked headers functions in repository struct
- move storage repository to factory, to correspond with event
  repository path
- remove unused files
- reformat sql
- remove line breaks in imports
2019-08-28 09:25:13 -05:00

60 lines
1.9 KiB
Go

// VulcanizeDB
// Copyright © 2019 Vulcanize
// 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/>.
package fetcher
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)
// TODO Extend FetchLogs for doing several blocks at a time
}
type LogFetcher struct {
blockChain core.BlockChain
}
func NewLogFetcher(blockchain core.BlockChain) *LogFetcher {
return &LogFetcher{
blockChain: blockchain,
}
}
// 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)
query := ethereum.FilterQuery{
BlockHash: &blockHash,
Addresses: addresses,
// Search for _any_ of the topics in topic0 position; see docs on `FilterQuery`
Topics: [][]common.Hash{topic0s},
}
logs, err := logFetcher.blockChain.GetEthLogsWithCustomQuery(query)
if err != nil {
// TODO review aggregate fetching error handling
return []types.Log{}, err
}
return logs, nil
}