mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2026-04-15 13:01:03 +02:00
124 lines
3.1 KiB
Go
124 lines
3.1 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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/*
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Note: currently only supports IP targets (A records), not hostname targets
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*/
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package source
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import (
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"context"
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"fmt"
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"math/rand"
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"net"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"sigs.k8s.io/external-dns/endpoint"
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"sigs.k8s.io/external-dns/pkg/events"
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"sigs.k8s.io/external-dns/source/types"
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)
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// fakeSource is an implementation of Source that provides dummy endpoints for
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// testing/dry-running of dns providers without needing an attached Kubernetes cluster.
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//
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// +externaldns:source:name=fake
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// +externaldns:source:category=Testing
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// +externaldns:source:description=Provides dummy endpoints for testing and dry-running
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// +externaldns:source:resources=Fake Endpoints
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// +externaldns:source:filters=
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// +externaldns:source:namespace=
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// +externaldns:source:fqdn-template=true
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// +externaldns:source:events=true
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type fakeSource struct {
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dnsName string
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}
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const (
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defaultFQDNTemplate = "example.com"
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)
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// NewFakeSource creates a new fakeSource with the given config.
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func NewFakeSource(fqdnTemplate string) (Source, error) {
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if fqdnTemplate == "" {
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fqdnTemplate = defaultFQDNTemplate
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}
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return &fakeSource{
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dnsName: fqdnTemplate,
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}, nil
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}
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func (sc *fakeSource) AddEventHandler(_ context.Context, _ func()) {
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}
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// Endpoints returns endpoint objects.
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func (sc *fakeSource) Endpoints(_ context.Context) ([]*endpoint.Endpoint, error) {
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endpoints := make([]*endpoint.Endpoint, 10)
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for i := range 10 {
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endpoints[i] = sc.generateEndpoint()
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}
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return MergeEndpoints(endpoints), nil
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}
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func (sc *fakeSource) generateEndpoint() *endpoint.Endpoint {
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ep := endpoint.NewEndpoint(
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generateDNSName(4, sc.dnsName),
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endpoint.RecordTypeA,
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generateIPAddress(),
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)
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ep.SetIdentifier = types.Fake
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ep.WithRefObject(events.NewObjectReference(&v1.Pod{
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TypeMeta: metav1.TypeMeta{
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Kind: "Pod",
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APIVersion: "v1",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: types.Fake + "-" + ep.DNSName,
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Namespace: v1.NamespaceDefault,
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},
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}, types.Fake))
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return ep
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}
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func generateIPAddress() string {
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// 192.0.2.[1-255] is reserved by RFC 5737 for documentation and examples
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return net.IPv4(
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byte(192),
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byte(0),
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byte(2),
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byte(rand.Intn(253)+1),
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).String()
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}
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var letterRunes = []rune("abcdefghijklmnopqrstuvwxyz")
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func generateDNSName(prefixLength int, dnsName string) string {
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prefixBytes := make([]rune, prefixLength)
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for i := range prefixBytes {
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prefixBytes[i] = letterRunes[rand.Intn(len(letterRunes))]
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}
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prefixStr := string(prefixBytes)
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return fmt.Sprintf("%s.%s", prefixStr, dnsName)
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}
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