feat: no-op mempool (#14297)

types/mempool/noop.go

@@ -0,0 +1,22 @@
+package mempool
+
+import (
+	"context"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+var _ Mempool = (*NoOpMempool)(nil)
+
+// NoOpMempool defines a no-op mempool. Transactions are completely discarded and
+// ignored when BaseApp interacts with the mempool.
+//
+// Note: When this mempool is used, it assumed that an application will rely
+// on Tendermint's transaction ordering defined in `RequestPrepareProposal`, which
+// is FIFO-ordered by default.
+type NoOpMempool struct{}
+
+func (NoOpMempool) Insert(context.Context, sdk.Tx) error      { return nil }
+func (NoOpMempool) Select(context.Context, [][]byte) Iterator { return nil }
+func (NoOpMempool) CountTx() int                              { return 0 }
+func (NoOpMempool) Remove(sdk.Tx) error                       { return nil }