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index_events.go
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index_events.go
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package middleware
import (
"context"
abci "github.com/tendermint/tendermint/abci/types"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/tx"
)
type indexEventsTxHandler struct {
// indexEvents defines the set of events in the form {eventType}.{attributeKey},
// which informs Tendermint what to index. If empty, all events will be indexed.
indexEvents map[string]struct{}
inner tx.Handler
}
// NewIndexEventsTxMiddleware defines a middleware to optionally only index a
// subset of the emitted events inside the Tendermint events indexer.
func NewIndexEventsTxMiddleware(indexEvents map[string]struct{}) tx.Middleware {
return func(txHandler tx.Handler) tx.Handler {
return indexEventsTxHandler{
indexEvents: indexEvents,
inner: txHandler,
}
}
}
var _ tx.Handler = indexEventsTxHandler{}
// CheckTx implements tx.Handler.CheckTx method.
func (txh indexEventsTxHandler) CheckTx(ctx context.Context, tx sdk.Tx, req abci.RequestCheckTx) (abci.ResponseCheckTx, error) {
res, err := txh.inner.CheckTx(ctx, tx, req)
if err != nil {
return res, err
}
res.Events = sdk.MarkEventsToIndex(res.Events, txh.indexEvents)
return res, nil
}
// DeliverTx implements tx.Handler.DeliverTx method.
func (txh indexEventsTxHandler) DeliverTx(ctx context.Context, tx sdk.Tx, req abci.RequestDeliverTx) (abci.ResponseDeliverTx, error) {
res, err := txh.inner.DeliverTx(ctx, tx, req)
if err != nil {
return res, err
}
res.Events = sdk.MarkEventsToIndex(res.Events, txh.indexEvents)
return res, nil
}
// SimulateTx implements tx.Handler.SimulateTx method.
func (txh indexEventsTxHandler) SimulateTx(ctx context.Context, tx sdk.Tx, req tx.RequestSimulateTx) (tx.ResponseSimulateTx, error) {
res, err := txh.inner.SimulateTx(ctx, tx, req)
if err != nil {
return res, err
}
res.Result.Events = sdk.MarkEventsToIndex(res.Result.Events, txh.indexEvents)
return res, nil
}