73 lines
2.6 KiB
Go
73 lines
2.6 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 chunker
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import (
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"strings"
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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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shared_t "github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
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)
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type Chunker interface {
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AddConfigs(transformerConfigs []shared_t.EventTransformerConfig)
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ChunkLogs(logs []types.Log) map[string][]types.Log
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}
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type LogChunker struct {
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AddressToNames map[string][]string
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NameToTopic0 map[string]common.Hash
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}
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// Returns a new log chunker with initialised maps.
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// Needs to have configs added with `AddConfigs` to consider logs for the respective transformer.
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func NewLogChunker() *LogChunker {
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return &LogChunker{
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AddressToNames: map[string][]string{},
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NameToTopic0: map[string]common.Hash{},
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}
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}
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// Configures the chunker by adding more addreses and topics to consider.
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func (chunker *LogChunker) AddConfigs(transformerConfigs []shared_t.EventTransformerConfig) {
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for _, config := range transformerConfigs {
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for _, address := range config.ContractAddresses {
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var lowerCaseAddress = strings.ToLower(address)
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chunker.AddressToNames[lowerCaseAddress] = append(chunker.AddressToNames[lowerCaseAddress], config.TransformerName)
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chunker.NameToTopic0[config.TransformerName] = common.HexToHash(config.Topic)
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}
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}
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}
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// Goes through an array of logs, associating relevant logs (matching addresses and topic) with transformers
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func (chunker *LogChunker) ChunkLogs(logs []types.Log) map[string][]types.Log {
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chunks := map[string][]types.Log{}
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for _, log := range logs {
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// Topic0 is not unique to each transformer, also need to consider the contract address
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relevantTransformers := chunker.AddressToNames[strings.ToLower(log.Address.String())]
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for _, transformer := range relevantTransformers {
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if chunker.NameToTopic0[transformer] == log.Topics[0] {
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chunks[transformer] = append(chunks[transformer], log)
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}
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}
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}
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return chunks
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}
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