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73 lines
1.9 KiB
73 lines
1.9 KiB
package txindex
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import (
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"context"
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cmn "github.com/tendermint/tmlibs/common"
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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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cmn.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 = *cmn.NewBaseService(nil, "IndexerService", is)
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return is
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}
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// OnStart implements cmn.Service by subscribing for all transactions
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// and indexing them by tags.
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func (is *IndexerService) OnStart() error {
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blockHeadersCh := make(chan interface{})
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if err := is.eventBus.Subscribe(context.Background(), subscriber, types.EventQueryNewBlockHeader, blockHeadersCh); err != nil {
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return err
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}
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txsCh := make(chan interface{})
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if err := is.eventBus.Subscribe(context.Background(), subscriber, types.EventQueryTx, txsCh); 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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e, ok := <-blockHeadersCh
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if !ok {
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return
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}
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header := e.(types.EventDataNewBlockHeader).Header
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batch := NewBatch(header.NumTxs)
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for i := int64(0); i < header.NumTxs; i++ {
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e, ok := <-txsCh
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if !ok {
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is.Logger.Error("Failed to index all transactions due to closed transactions channel", "height", header.Height, "numTxs", header.NumTxs, "numProcessed", i)
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return
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}
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txResult := e.(types.EventDataTx).TxResult
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batch.Add(&txResult)
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}
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is.idr.AddBatch(batch)
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is.Logger.Info("Indexed block", "height", header.Height)
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}
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}()
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return nil
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}
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// OnStop implements cmn.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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