Disable optimistic generation in masterchain

Author: SpyCheese

validator-session/validator-session.cpp

@@ -1413,6 +1413,7 @@ void ValidatorSessionImpl::generate_block_optimistic(td::uint32 cur_round,
                                        block->data_.clone(), block->root_hash_, stat->block_id.file_hash,
                                        [=, SelfId = actor_id(this)](td::Result<GeneratedCandidate> R) {
                                          if (R.is_error()) {
+                                           LOG(DEBUG) << "Optimistic generation error: " << R.move_as_error();
                                            return;
                                          }
                                          td::actor::send_closure(SelfId,

validator/validator-group.cpp

@@ -301,12 +301,19 @@ void ValidatorGroup::generate_block_optimistic(validatorsession::BlockSourceInfo
                                                td::BufferSlice prev_block, RootHash prev_root_hash,
                                                FileHash prev_file_hash, td::Promise<GeneratedCandidate> promise) {
   if (destroying_) {
+    promise.set_error(td::Status::Error("validator session finished"));
+    return;
+  }
+  if (shard_.is_masterchain()) {
+    promise.set_error(td::Status::Error("no optimistic generation in masterchain"));
     return;
   }
   if (last_known_round_id_ + 1 != source_info.priority.round) {
+    promise.set_error(td::Status::Error("too old round"));
     return;
   }
   if (optimistic_generation_ && optimistic_generation_->round >= source_info.priority.round) {
+    promise.set_error(td::Status::Error("optimistic generation already in progress"));
     return;
   }
   BlockIdExt block_id{create_next_block_id_simple(), prev_root_hash, prev_file_hash};