16736: Fixes typo.

[arvados.git] / lib / controller / api / routable.go

diff --git a/lib/controller/api/routable.go b/lib/controller/api/routable.go
index 6049cba8e403a576b4eba4774a6bfb192f4fa53c..f8874488299a0ec79df6bbe25b8b555b4279db42 100644 (file)
--- a/lib/controller/api/routable.go
+++ b/lib/controller/api/routable.go
@@ -15,3 +15,16 @@ import "context"
 // it to the router package would cause a circular dependency
 // router->arvadostest->ctrlctx->router.)
 type RoutableFunc func(ctx context.Context, opts interface{}) (interface{}, error)
+
+type RoutableFuncWrapper func(RoutableFunc) RoutableFunc
+
+// ComposeWrappers (w1, w2, w3, ...) returns a RoutableFuncWrapper that
+// composes w1, w2, w3, ... such that w1 is the outermost wrapper.
+func ComposeWrappers(wraps ...RoutableFuncWrapper) RoutableFuncWrapper {
+       return func(f RoutableFunc) RoutableFunc {
+               for i := len(wraps) - 1; i >= 0; i-- {
+                       f = wraps[i](f)
+               }
+               return f
+       }
+}