Copy kubernetes/pkg/util/bandwidth

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

pkg/server/bandwidth/utils.go

@@ -0,0 +1,66 @@
+/*
+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 bandwidth
+
+import (
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/api/resource"
+)
+
+var minRsrc = resource.MustParse("1k")
+var maxRsrc = resource.MustParse("1P")
+
+func validateBandwidthIsReasonable(rsrc *resource.Quantity) error {
+	if rsrc.Value() < minRsrc.Value() {
+		return fmt.Errorf("resource is unreasonably small (< 1kbit)")
+	}
+	if rsrc.Value() > maxRsrc.Value() {
+		return fmt.Errorf("resoruce is unreasonably large (> 1Pbit)")
+	}
+	return nil
+}
+
+// ExtractPodBandwidthResources extracts the ingress and egress from the given pod annotations
+func ExtractPodBandwidthResources(podAnnotations map[string]string) (ingress, egress *resource.Quantity, err error) {
+	if podAnnotations == nil {
+		return nil, nil, nil
+	}
+	str, found := podAnnotations["kubernetes.io/ingress-bandwidth"]
+	if found {
+		ingressValue, err := resource.ParseQuantity(str)
+		if err != nil {
+			return nil, nil, err
+		}
+		ingress = &ingressValue
+		if err := validateBandwidthIsReasonable(ingress); err != nil {
+			return nil, nil, err
+		}
+	}
+	str, found = podAnnotations["kubernetes.io/egress-bandwidth"]
+	if found {
+		egressValue, err := resource.ParseQuantity(str)
+		if err != nil {
+			return nil, nil, err
+		}
+		egress = &egressValue
+		if err := validateBandwidthIsReasonable(egress); err != nil {
+			return nil, nil, err
+		}
+	}
+	return ingress, egress, nil
+}