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