void ClientManagerImpl::resolveRoute()

in cpp/source/client/ClientManagerImpl.cpp [562:666]
94 lines of code
14 McCabe index (conditional complexity)

void ClientManagerImpl::resolveRoute(const std::string& target_host,
                                     const Metadata& metadata,
                                     const QueryRouteRequest& request,
                                     std::chrono::milliseconds timeout,
                                     const std::function<void(const std::error_code&, const TopicRouteDataPtr&)>& cb) {
  SPDLOG_DEBUG("Name server connection URL: {}", target_host);
  SPDLOG_DEBUG("Query route request: {}", request.ShortDebugString());
  RpcClientSharedPtr client = getRpcClient(target_host, false);
  if (!client) {
    SPDLOG_WARN("Failed to create RPC client for name server[host={}]", target_host);
    std::error_code ec = ErrorCode::RequestTimeout;
    cb(ec, nullptr);
    return;
  }

  auto invocation_context = new InvocationContext<QueryRouteResponse>();
  invocation_context->task_name = fmt::format("Query route of topic={} from {}", request.topic().name(), target_host);
  invocation_context->remote_address = target_host;
  invocation_context->context.set_deadline(std::chrono::system_clock::now() + timeout);
  for (const auto& item : metadata) {
    invocation_context->context.AddMetadata(item.first, item.second);
  }

  auto callback = [cb](const InvocationContext<QueryRouteResponse>* invocation_context) {
    if (!invocation_context->status.ok()) {
      SPDLOG_WARN("Failed to send query route request to server[host={}]. Reason: {}",
                  invocation_context->remote_address, invocation_context->status.error_message());
      std::error_code ec = ErrorCode::RequestTimeout;
      cb(ec, nullptr);
      return;
    }

    std::error_code ec;
    auto&& status = invocation_context->response.status();
    switch (status.code()) {
      case rmq::Code::OK: {
        std::vector<rmq::MessageQueue> message_queues;
        for (const auto& item : invocation_context->response.message_queues()) {
          message_queues.push_back(item);
        }
        auto ptr = std::make_shared<TopicRouteData>(std::move(message_queues));
        cb(ec, ptr);
        break;
      }

      case rmq::Code::ILLEGAL_ACCESS_POINT: {
        SPDLOG_WARN("IllegalAccessPoint: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::IllegalAccessPoint;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::UNAUTHORIZED: {
        SPDLOG_WARN("Unauthorized: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::Unauthorized;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::TOPIC_NOT_FOUND: {
        SPDLOG_WARN("TopicNotFound: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::NotFound;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::TOO_MANY_REQUESTS: {
        SPDLOG_WARN("TooManyRequest: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::TooManyRequests;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::CLIENT_ID_REQUIRED: {
        SPDLOG_ERROR("ClientIdRequired: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::InternalClientError;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::INTERNAL_SERVER_ERROR: {
        SPDLOG_WARN("InternalServerError: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::InternalServerError;
        cb(ec, nullptr);
        break;
      }

      case rmq::Code::PROXY_TIMEOUT: {
        SPDLOG_WARN("GatewayTimeout: {}. Host={}", status.message(), invocation_context->remote_address);
        ec = ErrorCode::GatewayTimeout;
        cb(ec, nullptr);
        break;
      }

      default: {
        SPDLOG_WARN("NotImplement: Please upgrade to latest SDK release. Host={}", invocation_context->remote_address);
        ec = ErrorCode::NotImplemented;
        cb(ec, nullptr);
        break;
      }
    }
  };
  invocation_context->callback = callback;
  client->asyncQueryRoute(request, invocation_context);
}