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package indexer
import (
"context"
"github.com/tendermint/tendermint/libs/service"
"github.com/tendermint/tendermint/types"
)
// XXX/TODO: These types should be moved to the indexer package.
const (
subscriber = "IndexerService"
)
// Service connects event bus, transaction and block indexers together in
// order to index transactions and blocks coming from the event bus.
type Service struct {
service.BaseService
txIdxr TxIndexer
blockIdxr BlockIndexer
eventBus *types.EventBus
}
// NewIndexerService returns a new service instance.
func NewIndexerService(
txIdxr TxIndexer,
blockIdxr BlockIndexer,
eventBus *types.EventBus,
) *Service {
is := &Service{txIdxr: txIdxr, blockIdxr: blockIdxr, 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 *Service) OnStart() error {
// Use SubscribeUnbuffered here to ensure both subscriptions does not get
// canceled 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(
"failed to add tx to batch",
"height", height,
"index", txResult.Index,
"err", err,
)
}
}
if err := is.blockIdxr.Index(eventDataHeader); err != nil {
is.Logger.Error("failed to index block", "height", height, "err", err)
} else {
is.Logger.Info("indexed block", "height", height)
}
if err = is.txIdxr.AddBatch(batch); err != nil {
is.Logger.Error("failed to index block txs", "height", height, "err", err)
} else {
is.Logger.Debug("indexed block txs", "height", height, "num_txs", eventDataHeader.NumTxs)
}
}
}()
return nil
}
// OnStop implements service.Service by unsubscribing from all transactions.
func (is *Service) OnStop() {
if is.eventBus.IsRunning() {
_ = is.eventBus.UnsubscribeAll(context.Background(), subscriber)
}
}