From a031b83a09a8628435317a03f199cdc18b78262f Mon Sep 17 00:00:00 2001
From: Matthew Heon <matthew.heon@gmail.com>
Date: Wed, 1 Nov 2017 11:24:59 -0400
Subject: Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
---
 vendor/k8s.io/kubernetes/pkg/client/retry/util.go | 79 +++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 vendor/k8s.io/kubernetes/pkg/client/retry/util.go

(limited to 'vendor/k8s.io/kubernetes/pkg/client/retry/util.go')

diff --git a/vendor/k8s.io/kubernetes/pkg/client/retry/util.go b/vendor/k8s.io/kubernetes/pkg/client/retry/util.go
new file mode 100644
index 000000000..3ac0840ad
--- /dev/null
+++ b/vendor/k8s.io/kubernetes/pkg/client/retry/util.go
@@ -0,0 +1,79 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package retry
+
+import (
+	"time"
+
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/util/wait"
+)
+
+// DefaultRetry is the recommended retry for a conflict where multiple clients
+// are making changes to the same resource.
+var DefaultRetry = wait.Backoff{
+	Steps:    5,
+	Duration: 10 * time.Millisecond,
+	Factor:   1.0,
+	Jitter:   0.1,
+}
+
+// DefaultBackoff is the recommended backoff for a conflict where a client
+// may be attempting to make an unrelated modification to a resource under
+// active management by one or more controllers.
+var DefaultBackoff = wait.Backoff{
+	Steps:    4,
+	Duration: 10 * time.Millisecond,
+	Factor:   5.0,
+	Jitter:   0.1,
+}
+
+// RetryConflict executes the provided function repeatedly, retrying if the server returns a conflicting
+// write. Callers should preserve previous executions if they wish to retry changes. It performs an
+// exponential backoff.
+//
+//     var pod *api.Pod
+//     err := RetryOnConflict(DefaultBackoff, func() (err error) {
+//       pod, err = c.Pods("mynamespace").UpdateStatus(podStatus)
+//       return
+//     })
+//     if err != nil {
+//       // may be conflict if max retries were hit
+//       return err
+//     }
+//     ...
+//
+// TODO: Make Backoff an interface?
+func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
+	var lastConflictErr error
+	err := wait.ExponentialBackoff(backoff, func() (bool, error) {
+		err := fn()
+		switch {
+		case err == nil:
+			return true, nil
+		case errors.IsConflict(err):
+			lastConflictErr = err
+			return false, nil
+		default:
+			return false, err
+		}
+	})
+	if err == wait.ErrWaitTimeout {
+		err = lastConflictErr
+	}
+	return err
+}
-- 
cgit v1.2.3-54-g00ecf