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64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/*
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*
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* Copyright 2017, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef GRPC_LOAD_REPORTING_H
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#define GRPC_LOAD_REPORTING_H
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#include <grpc/impl/codegen/port_platform.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Metadata key for the gRPC LB load balancer token.
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*
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* The value corresponding to this key is an opaque token that is given to the
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* frontend as part of each pick; the frontend sends this token to the backend
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* in each request it sends when using that pick. The token is used by the
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* backend to verify the request and to allow the backend to report load to the
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* gRPC LB system. */
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#define GRPC_LB_TOKEN_MD_KEY "lb-token"
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/** Metadata key for gRPC LB cost reporting.
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*
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* The value corresponding to this key is an opaque binary blob reported by the
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* backend as part of its trailing metadata containing cost information for the
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* call. */
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#define GRPC_LB_COST_MD_KEY "lb-cost-bin"
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#ifdef __cplusplus
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}
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#endif
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#endif /* GRPC_LOAD_REPORTING_H */
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