99 lines
3.2 KiB
Go
99 lines
3.2 KiB
Go
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/log"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
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)
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type WatcherRepository interface {
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GetCheckedColumnNames(db *postgres.DB) ([]string, error)
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CreateNotCheckedSQL(boolColumns []string) string
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MissingHeaders(startingBlockNumber int64, endingBlockNumber int64, db *postgres.DB, notCheckedSQL string) ([]core.Header, error)
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}
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type Watcher struct {
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Transformers []shared.Transformer
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DB *postgres.DB
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Fetcher shared.LogFetcher
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Chunker shared.Chunker
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Addresses []common.Address
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Topics []common.Hash
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Repository WatcherRepository
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}
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func NewWatcher(db *postgres.DB, fetcher shared.LogFetcher, repository WatcherRepository, chunker shared.Chunker) Watcher {
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return Watcher{
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DB: db,
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Fetcher: fetcher,
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Chunker: chunker,
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Repository: repository,
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}
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}
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// Adds transformers to the watcher, each needs an initializer and the associated config.
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// This also changes the configuration of the chunker, so that it will consider the new transformers.
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func (watcher *Watcher) AddTransformers(initializers []shared.TransformerInitializer, configs []shared.TransformerConfig) {
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if len(initializers) != len(configs) {
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panic("Mismatch in number of transformers initializers and configs!")
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}
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for _, initializer := range initializers {
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transformer := initializer(watcher.DB)
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watcher.Transformers = append(watcher.Transformers, transformer)
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}
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var contractAddresses []common.Address
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var topic0s []common.Hash
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for _, config := range configs {
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for _, address := range config.ContractAddresses {
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contractAddresses = append(contractAddresses, common.HexToAddress(address))
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}
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topic0s = append(topic0s, common.HexToHash(config.Topic))
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}
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watcher.Addresses = append(watcher.Addresses, contractAddresses...)
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watcher.Topics = append(watcher.Topics, topic0s...)
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watcher.Chunker.AddConfigs(configs)
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}
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func (watcher *Watcher) Execute() error {
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checkedColumnNames, err := watcher.Repository.GetCheckedColumnNames(watcher.DB)
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if err != nil {
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return err
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}
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notCheckedSQL := watcher.Repository.CreateNotCheckedSQL(checkedColumnNames)
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// TODO Handle start and end numbers in transformers
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missingHeaders, err := watcher.Repository.MissingHeaders(0, -1, watcher.DB, notCheckedSQL)
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if err != nil {
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log.Error("Fetching of missing headers failed in watcher!")
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return err
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}
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for _, header := range missingHeaders {
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// TODO Extend FetchLogs for doing several blocks at a time
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logs, err := watcher.Fetcher.FetchLogs(watcher.Addresses, watcher.Topics, header)
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if err != nil {
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// TODO Handle fetch error in watcher
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log.Error("Error while fetching logs for header %v in watcher", header.Id)
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return err
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}
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chunkedLogs := watcher.Chunker.ChunkLogs(logs)
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for _, transformer := range watcher.Transformers {
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logChunk := chunkedLogs[transformer.Name()]
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err = transformer.Execute(logChunk, header)
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if err != nil {
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log.Error("%v transformer failed to execute in watcher: %v", transformer.Name(), err)
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return err
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}
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}
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}
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return err
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}
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