HI everyone!
I am very new to gRPC and I need to implement a gRPC interceptor that will
intercept incoming calls from the client before sending it to the user
facing API Gateway.
For more context:
I implemented an rbac component as a stand-alone in C++ and the goal is to
have the gRPC interceptor to perform rbac checks on the user making a call
to some operation. before sending it off for further processing. I need a
way to get the service name from the grpc call that is coming to that gw
server and from there call the code passing that as an argument for the
check. But I don't see an easy way to extract the service name? Here is my
boilerplate:
void rbac_interceptor::Intercept(grpc::experimental::InterceptorBatchMethods
* methods)
{
// This indicates that the current call is a client call and the client
is about to send initial metadata.
if (methods->QueryInterceptionHookPoint(
grpc::experimental::InterceptionHookPoints::
PRE_SEND_INITIAL_METADATA)) // Note:
PRE_SEND_INITIAL_METADATA: Occurs before sending initial metadata
// to the other side (client or
server).
{
// Retrieve the initial metadata sent by the client
auto recieved_initial_metadata{ methods->GetSendInitialMetadata() };
}
methods->Proceed();
}
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