mirror of
https://github.com/kubernetes-sigs/external-dns.git
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6efca134f5
This requires pinning grpc for now as istio client-go otherwise pulls in breaking changes.
105 lines
2.4 KiB
Go
105 lines
2.4 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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"time"
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"sigs.k8s.io/external-dns/endpoint"
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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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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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func init() {
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rand.Seed(time.Now().UnixNano())
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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(ctx context.Context, handler func()) {
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}
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// Endpoints returns endpoint objects.
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func (sc *fakeSource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
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endpoints := make([]*endpoint.Endpoint, 10)
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for i := 0; i < 10; i++ {
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endpoints[i], _ = sc.generateEndpoint()
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}
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return endpoints, nil
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}
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func (sc *fakeSource) generateEndpoint() (*endpoint.Endpoint, error) {
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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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return ep, nil
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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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