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package txindex
import (
"context"
"github.com/tendermint/tendermint/types"
cmn "github.com/tendermint/tmlibs/common"
)
const (
subscriber = "IndexerService"
)
type IndexerService struct {
cmn.BaseService
idr TxIndexer
eventBus *types.EventBus
}
func NewIndexerService(idr TxIndexer, eventBus *types.EventBus) *IndexerService {
is := &IndexerService{idr: idr, eventBus: eventBus}
is.BaseService = *cmn.NewBaseService(nil, "IndexerService", is)
return is
}
// OnStart implements cmn.Service by subscribing for all transactions
// and indexing them by tags.
func (is *IndexerService) OnStart() error {
ch := make(chan interface{})
if err := is.eventBus.Subscribe(context.Background(), subscriber, types.EventQueryTx, ch); err != nil {
return err
}
go func() {
for event := range ch {
// TODO: may be not perfomant to write one event at a time
txResult := event.(types.TMEventData).Unwrap().(types.EventDataTx).TxResult
is.idr.Index(&txResult)
}
}()
return nil
}
// OnStop implements cmn.Service by unsubscribing from all transactions.
func (is *IndexerService) OnStop() {
if is.eventBus.IsRunning() {
_ = is.eventBus.UnsubscribeAll(context.Background(), subscriber)
}
}