92 lines
2.9 KiB
Go
92 lines
2.9 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 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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}
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func NewWatcher(db *postgres.DB, bc core.BlockChain) Watcher {
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chunker := shared.NewLogChunker()
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fetcher := shared.NewFetcher(bc)
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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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}
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}
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// Adds transformers to the watcher and updates the chunker, so that it will consider the new transformers.
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func (watcher *Watcher) AddTransformers(initializers []shared.TransformerInitializer) {
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var contractAddresses []common.Address
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var topic0s []common.Hash
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var configs []shared.TransformerConfig
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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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config := transformer.GetConfig()
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configs = append(configs, config)
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addresses := shared.HexStringsToAddresses(config.ContractAddresses)
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contractAddresses = append(contractAddresses, addresses...)
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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 := shared.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 := shared.CreateNotCheckedSQL(checkedColumnNames)
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// TODO Handle start and end numbers in transformers
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missingHeaders, err := shared.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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// Can't quit early and mark as checked if there are no logs. If we are running continuousLogSync,
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// not all logs we're interested in might have been fetched.
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for _, transformer := range watcher.Transformers {
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transformerName := transformer.GetConfig().TransformerName
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logChunk := chunkedLogs[transformerName]
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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", transformerName, 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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