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/*
*
* Copyright 2018 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 GRPCPP_IMPL_CODEGEN_INTERCEPTOR_H
#define GRPCPP_IMPL_CODEGEN_INTERCEPTOR_H
namespace grpc {
namespace experimental {
class InterceptedMessage {
public:
template <class M>
bool Extract(M* msg); // returns false if definitely invalid extraction
template <class M>
M* MutableExtract();
uint64_t length(); // length on wire
};
enum class InterceptionHookPoints {
/* The first two in this list are for clients and servers */
PRE_SEND_INITIAL_METADATA,
PRE_SEND_MESSAGE,
PRE_SEND_STATUS /* server only */,
/* The following three are for hijacked clients only and can only be
registered by the global interceptor */
PRE_RECV_INITIAL_METADATA,
PRE_RECV_MESSAGE,
PRE_RECV_STATUS,
/* The following two are for all clients and servers */
POST_RECV_INITIAL_METADATA,
POST_RECV_MESSAGE,
POST_RECV_STATUS /* client only */,
POST_RECV_CLOSE /* server only */,
NUM_INTERCEPTION_HOOKS
};
class InterceptorBatchMethods {
public:
virtual ~InterceptorBatchMethods();
// Queries to check whether the current batch has an interception hook point
// of type \a type
virtual bool QueryInterceptionHookPoint(InterceptionHookPoints type) = 0;
// Calling this will signal that the interceptor is done intercepting the
// current batch of the RPC
virtual void Proceed() = 0;
// Calling this indicates that the interceptor has hijacked the RPC (only
// valid if the batch contains send_initial_metadata on the client side)
virtual void Hijack() = 0;
};
} // namespace experimental
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_INTERCEPTOR_H
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