git subrepo clone (merge) https://github.com/kubernetes-incubator/metrics-server.git metrics-server
subrepo:
subdir: "metrics-server"
merged: "92d8412"
upstream:
origin: "https://github.com/kubernetes-incubator/metrics-server.git"
branch: "master"
commit: "92d8412"
git-subrepo:
version: "0.4.0"
origin: "???"
commit: "???"
diff --git a/metrics-server/vendor/k8s.io/apiserver/pkg/admission/handler.go b/metrics-server/vendor/k8s.io/apiserver/pkg/admission/handler.go
new file mode 100644
index 0000000..d2a9e7d
--- /dev/null
+++ b/metrics-server/vendor/k8s.io/apiserver/pkg/admission/handler.go
@@ -0,0 +1,79 @@
+/*
+Copyright 2015 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 admission
+
+import (
+ "time"
+
+ "k8s.io/apimachinery/pkg/util/sets"
+)
+
+const (
+ // timeToWaitForReady is the amount of time to wait to let an admission controller to be ready to satisfy a request.
+ // this is useful when admission controllers need to warm their caches before letting requests through.
+ timeToWaitForReady = 10 * time.Second
+)
+
+// ReadyFunc is a function that returns true if the admission controller is ready to handle requests.
+type ReadyFunc func() bool
+
+// Handler is a base for admission control handlers that
+// support a predefined set of operations
+type Handler struct {
+ operations sets.String
+ readyFunc ReadyFunc
+}
+
+// Handles returns true for methods that this handler supports
+func (h *Handler) Handles(operation Operation) bool {
+ return h.operations.Has(string(operation))
+}
+
+// NewHandler creates a new base handler that handles the passed
+// in operations
+func NewHandler(ops ...Operation) *Handler {
+ operations := sets.NewString()
+ for _, op := range ops {
+ operations.Insert(string(op))
+ }
+ return &Handler{
+ operations: operations,
+ }
+}
+
+// SetReadyFunc allows late registration of a ReadyFunc to know if the handler is ready to process requests.
+func (h *Handler) SetReadyFunc(readyFunc ReadyFunc) {
+ h.readyFunc = readyFunc
+}
+
+// WaitForReady will wait for the readyFunc (if registered) to return ready, and in case of timeout, will return false.
+func (h *Handler) WaitForReady() bool {
+ // there is no ready func configured, so we return immediately
+ if h.readyFunc == nil {
+ return true
+ }
+
+ timeout := time.After(timeToWaitForReady)
+ for !h.readyFunc() {
+ select {
+ case <-time.After(100 * time.Millisecond):
+ case <-timeout:
+ return h.readyFunc()
+ }
+ }
+ return true
+}