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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
#define GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
#include <type_traits>
#include <grpc/impl/codegen/byte_buffer.h>
#include <grpc/impl/codegen/log.h>
#include <grpc++/impl/codegen/serialization_traits.h>
#include <grpc++/impl/codegen/config_protobuf.h>
#include <grpc++/impl/codegen/status.h>
namespace grpc {
class ProtoSerializerInterface {
public:
// Serialize the msg into a buffer created inside the function. The caller
// should destroy the returned buffer when done with it. If serialization
// fails,
// false is returned and buffer is left unchanged.
virtual Status SerializeProto(const grpc::protobuf::Message& msg,
grpc_byte_buffer** buffer) = 0;
// The caller keeps ownership of buffer and msg.
virtual Status DeserializeProto(grpc_byte_buffer* buffer,
grpc::protobuf::Message* msg,
int max_message_size) = 0;
};
// TODO(dgq): This is a temporary fix to work around codegen issues. Its purpose
// is to hold a polymorphic proto serializer/deserializer instance. It's
// initialized as part of src/cpp/proto/proto_serializer.cc.
//
// This global variable plus all related code (ProtoSerializerInteface,
// ProtoSerializer) will be removed in the future.
extern ProtoSerializerInterface* g_proto_serializer;
class ProtoSerializer : public ProtoSerializerInterface {
public:
// Serialize the msg into a buffer created inside the function. The caller
// should destroy the returned buffer when done with it. If serialization
// fails,
// false is returned and buffer is left unchanged.
Status SerializeProto(const grpc::protobuf::Message& msg,
grpc_byte_buffer** buffer) override;
// The caller keeps ownership of buffer and msg.
Status DeserializeProto(grpc_byte_buffer* buffer,
grpc::protobuf::Message* msg,
int max_message_size) override;
};
template <class T>
class SerializationTraits<T, typename std::enable_if<std::is_base_of<
grpc::protobuf::Message, T>::value>::type> {
public:
static Status Serialize(const grpc::protobuf::Message& msg,
grpc_byte_buffer** buffer, bool* own_buffer) {
*own_buffer = true;
GPR_ASSERT(g_proto_serializer != nullptr &&
"No ProtoSerializer instance registered. Make sure grpc++ is "
"being initialized.");
return g_proto_serializer->SerializeProto(msg, buffer);
}
static Status Deserialize(grpc_byte_buffer* buffer,
grpc::protobuf::Message* msg,
int max_message_size) {
GPR_ASSERT(g_proto_serializer != nullptr &&
"No ProtoSerializer instance registered. Make sure grpc++ is "
"being initialized.");
auto status =
g_proto_serializer->DeserializeProto(buffer, msg, max_message_size);
grpc_byte_buffer_destroy(buffer);
return status;
}
};
} // namespace grpc
#endif // GRPCXX_IMPL_CODEGEN_PROTO_UTILS_H
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