abci: PrepareProposal (#6544)

abci/example/kvstore/kvstore.go

@@ -171,3 +171,9 @@ func (app *Application) Query(reqQuery types.RequestQuery) (resQuery types.Respo
 
 	return resQuery
 }
+
+func (app *Application) PrepareProposal(
+	req types.RequestPrepareProposal) types.ResponsePrepareProposal {
+	return types.ResponsePrepareProposal{
+		BlockData: req.BlockData}
+}

abci/example/kvstore/persistent_kvstore.go

@@ -166,6 +166,15 @@ func (app *PersistentKVStoreApplication) ApplySnapshotChunk(
 	return types.ResponseApplySnapshotChunk{Result: types.ResponseApplySnapshotChunk_ABORT}
 }
 
+func (app *PersistentKVStoreApplication) PrepareProposal(
+	req types.RequestPrepareProposal) types.ResponsePrepareProposal {
+	if len(req.BlockData) >= 1 {
+		req.BlockData[1] = []byte("modified tx")
+	}
+
+	return types.ResponsePrepareProposal{BlockData: req.BlockData}
+}
+
 //---------------------------------------------
 // update validators