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1 /*
2  *
3  * Copyright 2017 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 #ifndef GRPC_LOAD_REPORTING_H
20 #define GRPC_LOAD_REPORTING_H
21 
22 #include <grpc/impl/codegen/port_platform.h>
23 
24 #ifdef __cplusplus
25 extern "C" {
26 #endif
27 
28 /** Metadata key for the gRPC LB load balancer token.
29  *
30  * The value corresponding to this key is an opaque token that is given to the
31  * frontend as part of each pick; the frontend sends this token to the backend
32  * in each request it sends when using that pick. The token is used by the
33  * backend to verify the request and to allow the backend to report load to the
34  * gRPC LB system. */
35 #define GRPC_LB_TOKEN_MD_KEY "lb-token"
36 
37 /** Metadata key for gRPC LB cost reporting.
38  *
39  * The value corresponding to this key is an opaque binary blob reported by the
40  * backend as part of its trailing metadata containing cost information for the
41  * call. */
42 #define GRPC_LB_COST_MD_KEY "lb-cost-bin"
43 
44 #ifdef __cplusplus
45 }
46 #endif
47 
48 #endif /* GRPC_LOAD_REPORTING_H */
49