std::unique_ptr KVExecutor::ExecuteData()

in executor/kv/kv_executor.cpp [87:135]
46 lines of code
15 McCabe index (conditional complexity)

std::unique_ptr<std::string> KVExecutor::ExecuteData(
    const std::string& request) {
  KVRequest kv_request;
  KVResponse kv_response;

  if (!kv_request.ParseFromString(request)) {
    LOG(ERROR) << "parse data fail";
    return nullptr;
  }

  LOG(ERROR)<<" execute cmd:"<<kv_request.cmd();
  if (kv_request.cmd() == KVRequest::SET) {
    Set(kv_request.key(), kv_request.value());
  } else if (kv_request.cmd() == KVRequest::GET) {
    kv_response.set_value(Get(kv_request.key()));
  } else if (kv_request.cmd() == KVRequest::GETALLVALUES) {
    kv_response.set_value(GetAllValues());
  } else if (kv_request.cmd() == KVRequest::GETRANGE) {
    kv_response.set_value(GetRange(kv_request.key(), kv_request.value()));
  } else if (kv_request.cmd() == KVRequest::SET_WITH_VERSION) {
    SetWithVersion(kv_request.key(), kv_request.value(), kv_request.version());
  } else if (kv_request.cmd() == KVRequest::GET_WITH_VERSION) {
    GetWithVersion(kv_request.key(), kv_request.version(),
                   kv_response.mutable_value_info());
  } else if (kv_request.cmd() == KVRequest::GET_ALL_ITEMS) {
    GetAllItems(kv_response.mutable_items());
  } else if (kv_request.cmd() == KVRequest::GET_KEY_RANGE) {
    GetKeyRange(kv_request.min_key(), kv_request.max_key(),
                kv_response.mutable_items());
  } else if (kv_request.cmd() == KVRequest::GET_HISTORY) {
    GetHistory(kv_request.key(), kv_request.min_version(),
               kv_request.max_version(), kv_response.mutable_items());
  } else if (kv_request.cmd() == KVRequest::GET_TOP) {
    GetTopHistory(kv_request.key(), kv_request.top_number(),
                  kv_response.mutable_items());
  }
  else if(!kv_request.smart_contract_request().empty()){
    std::unique_ptr<std::string> resp = contract_manager_->ExecuteData(kv_request.smart_contract_request());
    if(resp != nullptr){
      kv_response.set_smart_contract_response(*resp);
    }
  }

  std::unique_ptr<std::string> resp_str = std::make_unique<std::string>();
  if (!kv_response.SerializeToString(resp_str.get())) {
    return nullptr;
  }
  return resp_str;
}