ceeaa0f8d3
- Verify license added to each file - Order imports by group and separate with line breaks
58 lines
1.7 KiB
Go
58 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 price_feeds
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import (
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"math/big"
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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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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
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)
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type IPriceFeedFetcher interface {
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FetchLogValues(blockNumber int64) ([]types.Log, error)
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}
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type PriceFeedFetcher struct {
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blockChain core.BlockChain
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contractAddresses []string
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}
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func NewPriceFeedFetcher(blockChain core.BlockChain, contractAddresses []string) PriceFeedFetcher {
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return PriceFeedFetcher{
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blockChain: blockChain,
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contractAddresses: contractAddresses,
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}
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}
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func (fetcher PriceFeedFetcher) FetchLogValues(blockNumber int64) ([]types.Log, error) {
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var addresses []common.Address
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for _, addr := range fetcher.contractAddresses {
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addresses = append(addresses, common.HexToAddress(addr))
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}
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n := big.NewInt(blockNumber)
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query := ethereum.FilterQuery{
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FromBlock: n,
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ToBlock: n,
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Addresses: addresses,
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Topics: [][]common.Hash{{common.HexToHash(shared.LogValueSignature)}},
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}
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return fetcher.blockChain.GetEthLogsWithCustomQuery(query)
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}
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