58 lines
1.9 KiB
Go
58 lines
1.9 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/common"
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"github.com/ethereum/go-ethereum/core/types"
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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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// Initialises a chunker by creating efficient lookup maps
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func NewLogChunker(transformerConfigs []TransformerConfig) LogChunker {
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addressToNames := map[string][]string{}
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nameToTopic0 := map[string]common.Hash{}
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for _, config := range transformerConfigs {
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for _, address := range config.ContractAddresses {
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addressToNames[address] = append(addressToNames[address], config.TransformerName)
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nameToTopic0[config.TransformerName] = common.HexToHash(config.Topic)
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}
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}
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return LogChunker{
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addressToNames,
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nameToTopic0,
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}
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}
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// Goes through an array of logs, associating relevant logs with transformers
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func (chunker LogChunker) ChunkLogs(logs []types.Log) (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[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
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}
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