Add call func wrapper

client/options.go

@@ -52,6 +52,9 @@ type CallOptions struct {
 	// Request/Response timeout
 	RequestTimeout time.Duration
 
+	// Middleware for low level call func
+	CallWrappers []CallFuncWrapper
+
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -177,6 +180,13 @@ func Wrap(w Wrapper) Option {
 	}
 }
 
+// Adds a Wrapper to the list of CallFunc wrappers
+func WrapCallFunc(cw ...CallFuncWrapper) Option {
+	return func(o *Options) {
+		o.CallOptions.CallWrappers = append(o.CallOptions.CallWrappers, cw...)
+	}
+}
+
 // Backoff is used to set the backoff function used
 // when retrying Calls
 func Backoff(fn BackoffFunc) Option {
@@ -216,6 +226,13 @@ func WithSelectOption(so ...selector.SelectOption) CallOption {
 	}
 }
 
+// WithCallFuncWrapper is a CallOption which adds to the existing CallFunc wrappers
+func WithCallFuncWrapper(cw ...CallFuncWrapper) CallOption {
+	return func(o *CallOptions) {
+		o.CallWrappers = append(o.CallWrappers, cw...)
+	}
+}
+
 // WithBackoff is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithBackoff(fn BackoffFunc) CallOption {