57 lines
1.7 KiB
Go
57 lines
1.7 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 shared
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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 LogFetcher interface {
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FetchLogs(contractAddresses []common.Address, 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(addresses []common.Address, topic0s []common.Hash, header core.Header) ([]types.Log, error) {
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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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