I have an gRPC interceptor written in java
my gRPC interceptor looks like this
public class GrpcServerInterceptor implements ServerInterceptor {
@Override
public <R, T> ServerCall.Listener<R> interceptCall(ServerCall<R, T> call,
Metadata requestHeaders, ServerCallHandler<R, T> next) {
if(call == null || next == null)
return null;
if(call != null) {
String actionName = call.getMethodDescriptor().getBareMethodName();
String serviceName = call.getMethodDescriptor().getServiceName();
State.Holder.set(State.newBuilder().withControllerName(serviceName).withActionName(actionName).withFramework("grpc").build());
}
ServerCall.Listener<R> delegate = next.startCall(call, requestHeaders);
return new ForwardingServerCallListener.SimpleForwardingServerCallListener<R>(delegate) {
@Override
public void onHalfClose() {
try {
super.onHalfClose();
} catch (Exception e) {
call.close(Status.INTERNAL
.withCause (e)
.withDescription("error message"), new Metadata());
}
}
};
}
}
I just want to unit test for above interceptor in junit.
I am facing issues around building ServerCall, Metaddata and ServerCallHandler Objects and passing them around.
I tried to create Server Call object like below in my unit test.
ServerCall serverCall = new ForwardingServerCall() {
@Override
protected ServerCall delegate() {
return null;
}
@Override
public MethodDescriptor getMethodDescriptor() {
return MethodDescriptor.newBuilder().
setType(MethodType.UNKNOWN).
setRequestMarshaller(ProtoUtils.marshaller((StudentRequest.getDefaultInstance()))).
setResponseMarshaller(ProtoUtils.marshaller(StudentResponse.getDefaultInstance())).
setFullMethodName(generateFullMethodName("com.test.cloud.sc.grpc.backend.service.StudentServiceImpl", "getStudentInfo")).
build();
}
};
But above codeblock has issues around setting Request and Response Marshaller.
How can i unit test all the scenarios for my interceptor with minimal code setup and I don't want to start grpc server at all?
How can i improve null check handling in gRPC interceptor?
Many Thanks
Take a look at https://github.com/grpc/grpc-java/blob/master/api/src/test/java/io/grpc/ServerInterceptorsTest.java or https://github.com/grpc/grpc-java/blob/master/core/src/test/java/io/grpc/util/UtilServerInterceptorsTest.java to see how server interceptors are tested.
Regarding null
, the grpc framework will not pass null in call
or next
so I don't see any reason to check. In any case consider using com.google.common.base.Preconditions.checkNotNull
from Guava.
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