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82 lines
2.2 KiB
82 lines
2.2 KiB
package txindex
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import (
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"context"
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"github.com/tendermint/tendermint/libs/service"
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"github.com/tendermint/tendermint/types"
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)
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const (
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subscriber = "IndexerService"
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)
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// IndexerService connects event bus and transaction indexer together in order
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// to index transactions coming from event bus.
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type IndexerService struct {
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service.BaseService
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idr TxIndexer
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eventBus *types.EventBus
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}
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// NewIndexerService returns a new service instance.
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func NewIndexerService(idr TxIndexer, eventBus *types.EventBus) *IndexerService {
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is := &IndexerService{idr: idr, eventBus: eventBus}
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is.BaseService = *service.NewBaseService(nil, "IndexerService", is)
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return is
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}
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// OnStart implements service.Service by subscribing for all transactions
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// and indexing them by events.
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func (is *IndexerService) OnStart() error {
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// Use SubscribeUnbuffered here to ensure both subscriptions does not get
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// cancelled due to not pulling messages fast enough. Cause this might
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// sometimes happen when there are no other subscribers.
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blockHeadersSub, err := is.eventBus.SubscribeUnbuffered(
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context.Background(),
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subscriber,
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types.EventQueryNewBlockHeader)
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if err != nil {
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return err
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}
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txsSub, err := is.eventBus.SubscribeUnbuffered(context.Background(), subscriber, types.EventQueryTx)
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if err != nil {
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return err
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}
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go func() {
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for {
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msg := <-blockHeadersSub.Out()
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eventDataHeader := msg.Data().(types.EventDataNewBlockHeader)
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height := eventDataHeader.Header.Height
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batch := NewBatch(eventDataHeader.NumTxs)
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for i := int64(0); i < eventDataHeader.NumTxs; i++ {
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msg2 := <-txsSub.Out()
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txResult := msg2.Data().(types.EventDataTx).TxResult
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if err = batch.Add(&txResult); err != nil {
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is.Logger.Error("Can't add tx to batch",
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"height", height,
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"index", txResult.Index,
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"err", err)
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}
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}
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if err = is.idr.AddBatch(batch); err != nil {
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is.Logger.Error("Failed to index block", "height", height, "err", err)
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} else {
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is.Logger.Info("Indexed block", "height", height)
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}
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}
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}()
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return nil
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}
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// OnStop implements service.Service by unsubscribing from all transactions.
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func (is *IndexerService) OnStop() {
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if is.eventBus.IsRunning() {
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_ = is.eventBus.UnsubscribeAll(context.Background(), subscriber)
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}
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}
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