mirror of
https://github.com/kubernetes-sigs/external-dns.git
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c2751f81cf
* add support for hostname annotation in ingress resource * implement getHostnamesFromAnnotations and use that in ingress/service
85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package source
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import (
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"fmt"
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"math"
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"net"
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"strconv"
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"strings"
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"github.com/kubernetes-incubator/external-dns/endpoint"
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)
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const (
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// The annotation used for figuring out which controller is responsible
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controllerAnnotationKey = "external-dns.alpha.kubernetes.io/controller"
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// The annotation used for defining the desired hostname
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hostnameAnnotationKey = "external-dns.alpha.kubernetes.io/hostname"
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// The annotation used for defining the desired ingress target
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targetAnnotationKey = "external-dns.alpha.kubernetes.io/target"
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// The annotation used for defining the desired DNS record TTL
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ttlAnnotationKey = "external-dns.alpha.kubernetes.io/ttl"
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// The value of the controller annotation so that we feel responsible
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controllerAnnotationValue = "dns-controller"
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)
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const (
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ttlMinimum = 1
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ttlMaximum = math.MaxUint32
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)
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// Source defines the interface Endpoint sources should implement.
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type Source interface {
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Endpoints() ([]*endpoint.Endpoint, error)
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}
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func getTTLFromAnnotations(annotations map[string]string) (endpoint.TTL, error) {
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ttlNotConfigured := endpoint.TTL(0)
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ttlAnnotation, exists := annotations[ttlAnnotationKey]
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if !exists {
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return ttlNotConfigured, nil
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}
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ttlValue, err := strconv.ParseInt(ttlAnnotation, 10, 64)
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if err != nil {
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return ttlNotConfigured, fmt.Errorf("\"%v\" is not a valid TTL value", ttlAnnotation)
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}
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if ttlValue < ttlMinimum || ttlValue > ttlMaximum {
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return ttlNotConfigured, fmt.Errorf("TTL value must be between [%d, %d]", ttlMinimum, ttlMaximum)
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}
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return endpoint.TTL(ttlValue), nil
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}
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func getHostnamesFromAnnotations(annotations map[string]string) []string {
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hostnameAnnotation, exists := annotations[hostnameAnnotationKey]
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if !exists {
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return nil
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}
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return strings.Split(strings.Replace(hostnameAnnotation, " ", "", -1), ",")
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}
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// suitableType returns the DNS resource record type suitable for the target.
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// In this case type A for IPs and type CNAME for everything else.
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func suitableType(target string) string {
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if net.ParseIP(target) != nil {
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return endpoint.RecordTypeA
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}
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return endpoint.RecordTypeCNAME
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}
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