client_factory_component.hpp

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#pragma once
 
/// @file userver/ugrpc/client/client_factory_component.hpp
/// @brief @copybrief ugrpc::client::ClientFactoryComponent
 
#include <userver/components/loggable_component_base.hpp>
 
#include <userver/ugrpc/client/client_factory.hpp>
#include <userver/ugrpc/client/queue_holder.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace ugrpc::client {
 
/// @ingroup userver_components
///
/// @brief Provides a ClientFactory in the component system
///
/// Multiple ClientFactoryComponent instances may be created if different
/// parameters are required for different clients.
///
/// ## Authentication
/// Authentication is controlled by `auth-type` static config field.
/// Possible values:
/// - `insecure` (`InsecureChannelCredentials` - default)
/// - `ssl` (`SslCredentials`)
///
/// Default (system) authentication keys are used regardless of the chosen
/// auth-type.
///
/// ## Service config
/// As per https://github.com/grpc/grpc/blob/master/doc/service_config.md
/// service config should be distributed via the name resolution process.
/// We allow setting default service_config: pass desired JSON literal
/// to `default-service-config` parameter
 
// clang-format off
 
/// ## Static options:
/// The default component name for static config is `"grpc-client-factory"`.
///
/// Name | Description | Default value
/// ---- | ----------- | -------------
/// task-processor | the task processor for blocking channel creation | -
/// channel-args | a map of channel arguments, see gRPC Core docs | {}
/// native-log-level | min log level for the native gRPC library | 'error'
/// auth-type | authentication method, see above | -
/// default-service-config | default service config, see above | -
/// channel-count | Number of underlying grpc::Channel objects | 1
/// middlewares | middlewares names to use | []
///
///
/// @see https://grpc.github.io/grpc/core/group__grpc__arg__keys.html
 
// clang-format on
 
class ClientFactoryComponent final : public components::LoggableComponentBase {
 public:
  static constexpr std::string_view kName = "grpc-client-factory";
 
  ClientFactoryComponent(const components::ComponentConfig& config,
                         const components::ComponentContext& context);
 
  ClientFactory& GetFactory();
 
  static yaml_config::Schema GetStaticConfigSchema();
 
 private:
  std::optional<QueueHolder> queue_;
  std::optional<ClientFactory> factory_;
};
 
}  // namespace ugrpc::client
 
template <>
inline constexpr bool
    components::kHasValidate<ugrpc::client::ClientFactoryComponent> = true;
 
USERVER_NAMESPACE_END