Split implementations from generic code

core/pkg/ingress/annotations/parser/main.go

@@ -0,0 +1,102 @@
+/*
+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 parser
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+var (
+	// ErrMissingAnnotations is returned when the ingress rule
+	// does not contains annotations related with rate limit
+	ErrMissingAnnotations = errors.New("Ingress rule without annotations")
+
+	// ErrInvalidName ...
+	ErrInvalidName = errors.New("invalid annotation name")
+)
+
+type ingAnnotations map[string]string
+
+func (a ingAnnotations) parseBool(name string) (bool, error) {
+	val, ok := a[name]
+	if ok {
+		if b, err := strconv.ParseBool(val); err == nil {
+			return b, nil
+		}
+	}
+	return false, ErrMissingAnnotations
+}
+
+func (a ingAnnotations) parseString(name string) (string, error) {
+	val, ok := a[name]
+	if ok {
+		return val, nil
+	}
+	return "", ErrMissingAnnotations
+}
+
+func (a ingAnnotations) parseInt(name string) (int, error) {
+	val, ok := a[name]
+	if ok {
+		i, err := strconv.Atoi(val)
+		if err != nil {
+			return 0, fmt.Errorf("invalid annotations value: %v", err)
+		}
+		return i, nil
+	}
+	return 0, ErrMissingAnnotations
+}
+
+// GetBoolAnnotation ...
+func GetBoolAnnotation(name string, ing *extensions.Ingress) (bool, error) {
+	if ing == nil || ing.GetAnnotations() == nil {
+		return false, ErrMissingAnnotations
+	}
+	if name == "" {
+		return false, ErrInvalidName
+	}
+
+	return ingAnnotations(ing.GetAnnotations()).parseBool(name)
+}
+
+// GetStringAnnotation ...
+func GetStringAnnotation(name string, ing *extensions.Ingress) (string, error) {
+	if ing == nil || ing.GetAnnotations() == nil {
+		return "", ErrMissingAnnotations
+	}
+	if name == "" {
+		return "", ErrInvalidName
+	}
+
+	return ingAnnotations(ing.GetAnnotations()).parseString(name)
+}
+
+// GetIntAnnotation ...
+func GetIntAnnotation(name string, ing *extensions.Ingress) (int, error) {
+	if ing == nil || ing.GetAnnotations() == nil {
+		return 0, ErrMissingAnnotations
+	}
+	if name == "" {
+		return 0, ErrInvalidName
+	}
+
+	return ingAnnotations(ing.GetAnnotations()).parseInt(name)
+}