I can get close to having it work by looking at how Flatbuffer support was
added by doing something like this:
//Header file:
struct Thing1{
};
struct Thing2 : public Thing1 {
};
namespace helloworld {
// The greeting service definition.
class Greeter GRPC_FINAL {
public:
class Service : public ::grpc::Service {
public:
Service();
virtual ~Service() = default;
virtual ::grpc::Status SayHello(::grpc::ServerContext*, const Thing1*,
Thing2*){
return ::grpc::Status::OK;
}
};
};
} // namespace helloworld
namespace grpc {
template<class T>
class SerializationTraits<T, typename
std::enable_if<std::is_base_of<Thing1, T>::value>::type> {
public:
// The type we're passing here is a BufferRef, which is already
serialized
// FlatBuffer data, which then gets passed to GRPC.
static grpc::Status Serialize(const T &,
grpc_byte_buffer **buffer,
bool *own_buffer) {
auto slice = gpr_slice_from_static_string("Hello!World!");
// *buffer = grpc_raw_byte_buffer_create(&slice, 1); <- This
line make its not work at all!!!!!!
grpc_slice_unref(slice);
*own_buffer = true;
return grpc::Status();
}
// There is no de-serialization step in FlatBuffers, so we just
receive
// the data from GRPC.
static grpc::Status Deserialize(grpc_byte_buffer *buffer, T *) {
grpc_byte_buffer_destroy(buffer);
return grpc::Status();
}
};
} // namespace grpc;
namespace helloworld {
Greeter::Service::Service() {
AddMethod(new ::grpc::RpcServiceMethod(
"/bob",
::grpc::RpcMethod::NORMAL_RPC,
new ::grpc::RpcMethodHandler<Greeter::Service, Thing1,
Thing2>(std::mem_fn(&Greeter::Service::SayHello), this)));
}
} // namespace helloworld
if i use the grpc_cli tool i can get an empty message back when the *buffer
line is disabled:
grpc_cli call localhost:8080 /bob --binary_input=true --infile=frame.bin
--outfile=out.bin
Method name not found
connecting to localhost:8080
Rpc succeeded with OK status
but then its enabled i get this:
grpc_cli call localhost:8080 /bob --binary_input=true --infile=./frame.bin
--outfile=./out.bin
Method name not found
connecting to localhost:8080
Method name not found
I can see in the debugger that its going to the entire flow like i expect
for both cases, but how do i get it to echo back the raw data????
On Wednesday, May 31, 2017 at 10:43:03 PM UTC-7, Curtis Mahieu wrote:
>
> im trying to find an example of calling ServerBuilder::RegisterService
> with a custom Service that can read / write raw data.
>
> My use case is that i need an extra endpoint that does some metric
> reporting that responds with a custom format when pulled.
>
> Ideally i would like to reuse the server part of GRPC (in addition to some
> grpc native Services) for serving this custom endpoint.
>
> Thanks!
>
> Curtis
>
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