From 9ce2cff5c0906a0a2c1cd96d2fb2cdbf237eee2a Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Sun, 8 Aug 2021 22:21:45 +0200
Subject: [PATCH] Introduce WaiterFunc type

The WaiterFunc type is an adapter to allow the use of ordinary
functions as Waiter.
---
 pkg/contracts/contracts.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkg/contracts/contracts.go b/pkg/contracts/contracts.go
index 25513aa7..51594144 100644
--- a/pkg/contracts/contracts.go
+++ b/pkg/contracts/contracts.go
@@ -66,6 +66,15 @@ type Waiter interface {
 	Wait() error // Wait waits for execution to complete.
 }
 
+// The WaiterFunc type is an adapter to allow the use of ordinary functions as Waiter.
+// If f is a function with the appropriate signature, WaiterFunc(f) is a Waiter that calls f.
+type WaiterFunc func() error
+
+// Wait implements the Waiter interface.
+func (f WaiterFunc) Wait() error {
+	return f()
+}
+
 // Initer implements the Init method,
 // which initializes the object in addition to zeroing.
 type Initer interface {