| // |
| // Copyright 2022 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| #ifndef GRPC_SRC_CORE_EXT_XDS_XDS_LB_POLICY_REGISTRY_H |
| #define GRPC_SRC_CORE_EXT_XDS_XDS_LB_POLICY_REGISTRY_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <map> |
| #include <memory> |
| |
| #include "absl/strings/string_view.h" |
| #include "envoy/config/cluster/v3/cluster.upb.h" |
| |
| #include "src/core/ext/xds/xds_resource_type.h" |
| #include "src/core/lib/gprpp/validation_errors.h" |
| #include "src/core/lib/json/json.h" |
| |
| namespace grpc_core { |
| |
| // A registry that maintans a set of converters that are able to map xDS |
| // loadbalancing policy configurations to gRPC's JSON format. |
| class XdsLbPolicyRegistry { |
| public: |
| class ConfigFactory { |
| public: |
| virtual ~ConfigFactory() = default; |
| virtual Json::Object ConvertXdsLbPolicyConfig( |
| const XdsLbPolicyRegistry* registry, |
| const XdsResourceType::DecodeContext& context, |
| absl::string_view configuration, ValidationErrors* errors, |
| int recursion_depth) = 0; |
| virtual absl::string_view type() = 0; |
| }; |
| |
| XdsLbPolicyRegistry(); |
| |
| // Converts an xDS cluster load balancing policy message to gRPC's JSON |
| // format. An error is returned if none of the lb policies in the list are |
| // supported, or if a supported lb policy configuration conversion fails. \a |
| // recursion_depth indicates the current depth of the tree if lb_policy |
| // configuration recursively holds other lb policies. |
| Json::Array ConvertXdsLbPolicyConfig( |
| const XdsResourceType::DecodeContext& context, |
| const envoy_config_cluster_v3_LoadBalancingPolicy* lb_policy, |
| ValidationErrors* errors, int recursion_depth = 0) const; |
| |
| private: |
| // A map of config factories that goes from the type of the lb policy config |
| // to the config factory. |
| std::map<absl::string_view /* Owned by ConfigFactory */, |
| std::unique_ptr<ConfigFactory>> |
| policy_config_factories_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif // GRPC_SRC_CORE_EXT_XDS_XDS_LB_POLICY_REGISTRY_H |