105 lines
3.3 KiB
Go
105 lines
3.3 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 factories
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import (
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"log"
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"github.com/ethereum/go-ethereum/common"
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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 Transformer struct {
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Config shared.TransformerConfig
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Converter Converter
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Repository Repository
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Fetcher shared.SettableLogFetcher
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}
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type Converter interface {
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ToModels(ethLog []types.Log) ([]interface{}, error)
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}
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type Repository interface {
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Create(headerID int64, models []interface{}) error
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MarkHeaderChecked(headerID int64) error
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MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
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SetDB(db *postgres.DB)
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}
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func (transformer Transformer) NewTransformer(db *postgres.DB, bc core.BlockChain) shared.Transformer {
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transformer.Repository.SetDB(db)
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transformer.Fetcher.SetBC(bc)
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return transformer
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}
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func (transformer Transformer) Execute() error {
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transformerName := transformer.Config.TransformerName
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missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
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if err != nil {
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log.Printf("Error fetching mising headers in %v transformer: %v \n", transformerName, err)
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return err
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}
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log.Printf("Fetching %v event logs for %d headers \n", transformerName, len(missingHeaders))
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for _, header := range missingHeaders {
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// Grab topics from config
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var topics [][]common.Hash
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for _, topic := range transformer.Config.Topics {
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topics = append(topics, []common.Hash{common.HexToHash(topic)})
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}
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// Fetch the missing logs for a given header
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matchingLogs, err := transformer.Fetcher.FetchLogs(transformer.Config.ContractAddresses, topics, header.BlockNumber)
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if err != nil {
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log.Printf("Error fetching matching logs in %v transformer: %v", transformerName, err)
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return err
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}
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// No matching logs, mark the header as checked for this type of logs
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if len(matchingLogs) < 1 {
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err := transformer.Repository.MarkHeaderChecked(header.Id)
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if err != nil {
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log.Printf("Error marking header as checked in %v: %v", transformerName, err)
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return err
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}
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}
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models, err := transformer.Converter.ToModels(matchingLogs)
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if err != nil {
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log.Printf("Error converting logs in %v: %v", transformerName, err)
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return err
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}
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// Can't assert a whole collection, wash types individually for Create,
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// which needs interface{}
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var typelessModels []interface{}
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for _, m := range models {
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typelessModels = append(typelessModels, m.(interface{}))
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}
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err = transformer.Repository.Create(header.Id, typelessModels)
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if err != nil {
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log.Printf("Error persisting %v record: %v", transformerName, err)
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return err
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}
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}
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return nil
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}
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