UnaryClientInterceptor.go

func exampleUnaryClientInterceptor(ctx context.Context, method string, req, reply interface{},
	cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
	
  
  // Codes before executing GRPC
  log.Println("Some messages before execution")

	// usual invocation of the remote method
	err := invoker(ctx, method, req, reply, cc, opts...) 

  // Codes after executing GRPC
  log.Println("Some messages after execution")

	return err 
}


func main() {
...  
	// Setting up a gRPC connection
	conn, err := grpc.Dial(address, grpc.WithInsecure(),grpc.WithUnaryInterceptor(exampleUnaryClientInterceptor)) 
...
}