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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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cmn "github.com/tendermint/tendermint/libs/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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blockHeadersSub, err := is.eventBus.Subscribe(context.Background(), subscriber, 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.Subscribe(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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select {
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case msg := <-blockHeadersSub.Out():
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header := msg.Data().(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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select {
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case msg2 := <-txsSub.Out():
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txResult := msg2.Data().(types.EventDataTx).TxResult
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batch.Add(&txResult)
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case <-txsSub.Cancelled():
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is.Logger.Error("Failed to index a block. txsSub was cancelled. Did the Tendermint stop?",
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"err", txsSub.Err(),
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"height", header.Height,
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"numTxs", header.NumTxs,
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"numProcessed", i,
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)
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return
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}
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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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case <-blockHeadersSub.Cancelled():
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is.Logger.Error("Failed to index a block. blockHeadersSub was cancelled. Did the Tendermint stop?",
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"reason", blockHeadersSub.Err())
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return
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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 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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