mirror of
https://github.com/kubernetes-sigs/external-dns.git
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f4c758665b
* feat: add support for expand alias in pdns provider * feat: codereview * feat: rewrite docs * feat: gofmt * feat: rewrite using postprocessor * feat: gofmt * feat: update docs * fix: prefer-alias respects existing annotations * feat: update formatting verbs * fix: fix return values and call sites after convertRRSetToEndpoints signature change Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix: remove unused error return from convertRRSetToEndpoints Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
/*
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Copyright 2025 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 wrappers
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import (
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"context"
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"time"
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log "github.com/sirupsen/logrus"
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"sigs.k8s.io/external-dns/endpoint"
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"sigs.k8s.io/external-dns/source"
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"sigs.k8s.io/external-dns/source/annotations"
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)
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type postProcessor struct {
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source source.Source
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cfg PostProcessorConfig
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}
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type PostProcessorConfig struct {
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ttl int64
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preferAlias bool
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isConfigured bool
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}
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type PostProcessorOption func(*PostProcessorConfig)
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func WithTTL(ttl time.Duration) PostProcessorOption {
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return func(cfg *PostProcessorConfig) {
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if int64(ttl.Seconds()) > 0 {
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cfg.isConfigured = true
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cfg.ttl = int64(ttl.Seconds())
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}
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}
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}
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// WithPostProcessorPreferAlias enables setting alias=true on CNAME endpoints.
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// This signals to providers that support ALIAS records (like PowerDNS, AWS)
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// to create ALIAS records instead of CNAMEs.
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func WithPostProcessorPreferAlias(enabled bool) PostProcessorOption {
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return func(cfg *PostProcessorConfig) {
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cfg.preferAlias = enabled
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if enabled {
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cfg.isConfigured = true
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}
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}
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}
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func NewPostProcessor(source source.Source, opts ...PostProcessorOption) source.Source {
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cfg := PostProcessorConfig{}
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for _, opt := range opts {
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opt(&cfg)
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}
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return &postProcessor{source: source, cfg: cfg}
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}
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func (pp *postProcessor) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
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endpoints, err := pp.source.Endpoints(ctx)
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if err != nil {
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return nil, err
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}
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if !pp.cfg.isConfigured {
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return endpoints, nil
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}
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for _, ep := range endpoints {
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if ep == nil {
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continue
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}
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ep.WithMinTTL(pp.cfg.ttl)
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// Set alias annotation for CNAME records when preferAlias is enabled
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// Only set if not already explicitly configured at the source level
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if pp.cfg.preferAlias && ep.RecordType == endpoint.RecordTypeCNAME {
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if _, exists := ep.GetProviderSpecificProperty(annotations.AliasKey); !exists {
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ep.WithProviderSpecific("alias", "true")
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}
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}
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}
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return endpoints, nil
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}
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func (pp *postProcessor) AddEventHandler(ctx context.Context, handler func()) {
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log.Debug("postProcessor: adding event handler")
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pp.source.AddEventHandler(ctx, handler)
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}
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