How to use the grpclib.const.Handler function in grpclib

client_worker_pb2.TensorLike,
                common_pb2.VoidResp,
            ),
            '/ClientMaster.ClientWorker/Update': grpclib.const.Handler(
                self.Update,
                grpclib.const.Cardinality.UNARY_UNARY,
                client_worker_pb2.TensorLike,
                common_pb2.VoidResp,
            ),
            '/ClientMaster.ClientWorker/Sync': grpclib.const.Handler(
                self.Sync,
                grpclib.const.Cardinality.UNARY_UNARY,
                client_worker_pb2.SyncRequest,
                common_pb2.VoidResp,
            ),
            '/ClientMaster.ClientWorker/CompleteTask': grpclib.const.Handler(
                self.CompleteTask,
                grpclib.const.Cardinality.UNARY_UNARY,
                common_pb2.CompleteTaskReq,
                common_pb2.VoidResp,
            ),

def __mapping__(self):
        return {
            '/helloworld.Greeter/UnaryUnaryGreeting': grpclib.const.Handler(
                self.UnaryUnaryGreeting,
                grpclib.const.Cardinality.UNARY_UNARY,
                helloworld.helloworld_pb2.HelloRequest,
                helloworld.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/UnaryStreamGreeting': grpclib.const.Handler(
                self.UnaryStreamGreeting,
                grpclib.const.Cardinality.UNARY_STREAM,
                helloworld.helloworld_pb2.HelloRequest,
                helloworld.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/StreamUnaryGreeting': grpclib.const.Handler(
                self.StreamUnaryGreeting,
                grpclib.const.Cardinality.STREAM_UNARY,
                helloworld.helloworld_pb2.HelloRequest,
                helloworld.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/StreamStreamGreeting': grpclib.const.Handler(
                self.StreamStreamGreeting,
                grpclib.const.Cardinality.STREAM_STREAM,
                helloworld.helloworld_pb2.HelloRequest,
                helloworld.helloworld_pb2.HelloReply,
            ),

def __mapping__(self):
        return {
            '/DotaOptimizer/Rollout': grpclib.const.Handler(
                self.Rollout,
                grpclib.const.Cardinality.UNARY_UNARY,
                protos.DotaOptimizer_pb2.RolloutData,
                protos.DotaOptimizer_pb2.Empty2,
            ),
            '/DotaOptimizer/GetWeights': grpclib.const.Handler(
                self.GetWeights,
                grpclib.const.Cardinality.UNARY_UNARY,
                protos.DotaOptimizer_pb2.WeightQuery,
                protos.DotaOptimizer_pb2.Weights,
            ),

def __mapping__(self) -> typing.Dict[str, grpclib.const.Handler]:
        return {
            '/helloworld.Greeter/UnaryUnaryGreeting': grpclib.const.Handler(
                self.UnaryUnaryGreeting,
                grpclib.const.Cardinality.UNARY_UNARY,
                streaming.helloworld_pb2.HelloRequest,
                streaming.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/UnaryStreamGreeting': grpclib.const.Handler(
                self.UnaryStreamGreeting,
                grpclib.const.Cardinality.UNARY_STREAM,
                streaming.helloworld_pb2.HelloRequest,
                streaming.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/StreamUnaryGreeting': grpclib.const.Handler(
                self.StreamUnaryGreeting,
                grpclib.const.Cardinality.STREAM_UNARY,
                streaming.helloworld_pb2.HelloRequest,
                streaming.helloworld_pb2.HelloReply,
            ),
            '/helloworld.Greeter/StreamStreamGreeting': grpclib.const.Handler(
                self.StreamStreamGreeting,
                grpclib.const.Cardinality.STREAM_STREAM,
                streaming.helloworld_pb2.HelloRequest,
                streaming.helloworld_pb2.HelloReply,

def __mapping__(self) -> typing.Dict[str, grpclib.const.Handler]:
        return {
            '/grpc.health.v1.Health/Check': grpclib.const.Handler(
                self.Check,
                grpclib.const.Cardinality.UNARY_UNARY,
                grpclib.health.v1.health_pb2.HealthCheckRequest,
                grpclib.health.v1.health_pb2.HealthCheckResponse,
            ),
            '/grpc.health.v1.Health/Watch': grpclib.const.Handler(
                self.Watch,
                grpclib.const.Cardinality.UNARY_STREAM,
                grpclib.health.v1.health_pb2.HealthCheckRequest,
                grpclib.health.v1.health_pb2.HealthCheckResponse,
            ),

def __mapping__(self) -> typing.Dict[str, grpclib.const.Handler]:
        return {
            '/admin.Admin/Append': grpclib.const.Handler(
                self.Append,
                grpclib.const.Cardinality.UNARY_UNARY,
                pymap.admin.grpc.admin_pb2.AppendRequest,
                pymap.admin.grpc.admin_pb2.AppendResponse,
            ),

def __mapping__(self):
        return {
            '/DotaOptimizer/Rollout': grpclib.const.Handler(
                self.Rollout,
                grpclib.const.Cardinality.UNARY_UNARY,
                protos.DotaOptimizer_pb2.RolloutData,
                protos.DotaOptimizer_pb2.Empty2,
            ),
            '/DotaOptimizer/GetWeights': grpclib.const.Handler(
                self.GetWeights,
                grpclib.const.Cardinality.UNARY_UNARY,
                protos.DotaOptimizer_pb2.WeightQuery,
                protos.DotaOptimizer_pb2.Weights,
            ),