/* * * Copyright 2017 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_LOAD_REPORTING_H #define GRPC_LOAD_REPORTING_H #include <grpc/impl/codegen/port_platform.h> #ifdef __cplusplus extern "C" { #endif /** Metadata key for the gRPC LB load balancer token. * * The value corresponding to this key is an opaque token that is given to the * frontend as part of each pick; the frontend sends this token to the backend * in each request it sends when using that pick. The token is used by the * backend to verify the request and to allow the backend to report load to the * gRPC LB system. */ #define GRPC_LB_TOKEN_MD_KEY "lb-token" /** Metadata key for gRPC LB cost reporting. * * The value corresponding to this key is an opaque binary blob reported by the * backend as part of its trailing metadata containing cost information for the * call. */ #define GRPC_LB_COST_MD_KEY "lb-cost-bin" #ifdef __cplusplus } #endif #endif /* GRPC_LOAD_REPORTING_H */