Hi all, I'm implementing a simple resource oriented API with a gRPC server. Every request message type will have a 'name' field (or similar) that specifies the resource to be operated on. I would like to add the value of that name field to the gRPC context on every request, so it can be used later in application code.
As this is an action I'd like to perform on every request, a ServerInteceptor seemed like an appropriate place to add this bit of functionality. In implementing, I've taken inspiration from previous questions here and on the github repo: https://groups.google.com/g/grpc-io/c/_osH2D6L9Ck https://github.com/grpc/grpc-java/issues/5414 Our server will only accept unary calls, so the pattern of delaying next.startCall() by setting a NOOP listener until we receive the first message seems okay for our use case. In OnMessage, we'll parse the request message and call Contexts.interceptCall with the necessary info from the request. I have a few questions about this approach: - We need to call call.request(1) to initiate the request for the first message (as discussed in grpc-io/c/_osH2D6L9Ck). Would this create issues if we need more than one ServerInterceptor of this type? I.e. we'd have multiple interceptors initially with NOOP listeners delaying the call and calling call.request(1). - I couldn't find many examples of implementing a ServerInterceptor that adds a piece of information from a request message to the context. Should we consider other ways of handling this like including the necessary values in Metadata or adding to context in the handlers? Thanks! -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/e6463490-403d-4140-8a37-76477541491dn%40googlegroups.com.
