mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2026-03-01 14:01:01 +01:00
128 lines
4.2 KiB
Go
128 lines
4.2 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 source
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import (
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"fmt"
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"net/netip"
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"slices"
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"strings"
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log "github.com/sirupsen/logrus"
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"sigs.k8s.io/external-dns/endpoint"
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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/AAAA for IPs and type CNAME for everything else.
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// TODO: move this to the endpoint package?
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func suitableType(target string) string {
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netIP, err := netip.ParseAddr(target)
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if err != nil {
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return endpoint.RecordTypeCNAME
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}
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switch {
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case netIP.Is4():
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return endpoint.RecordTypeA
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case netIP.Is6():
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return endpoint.RecordTypeAAAA
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default:
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return endpoint.RecordTypeCNAME
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}
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}
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// ParseIngress parses an ingress string in the format "namespace/name" or "name".
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// It returns the namespace and name extracted from the string, or an error if the format is invalid.
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// If the namespace is not provided, it defaults to an empty string.
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func ParseIngress(ingress string) (string, string, error) {
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var namespace, name string
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var err error
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parts := strings.Split(ingress, "/")
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switch len(parts) {
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case 2:
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namespace, name = parts[0], parts[1]
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case 1:
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name = parts[0]
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default:
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err = fmt.Errorf("invalid ingress name (name or namespace/name) found %q", ingress)
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}
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return namespace, name, err
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}
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// MatchesServiceSelector checks if all key-value pairs in the selector map
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// are present and match the corresponding key-value pairs in the svcSelector map.
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// It returns true if all pairs match, otherwise it returns false.
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func MatchesServiceSelector(selector, svcSelector map[string]string) bool {
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for k, v := range selector {
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if lbl, ok := svcSelector[k]; !ok || lbl != v {
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return false
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}
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}
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return true
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}
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// MergeEndpoints merges endpoints with the same key (DNSName + RecordType + SetIdentifier + RecordTTL)
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// by combining their targets. CNAME endpoints are not merged (per DNS spec) but are deduplicated.
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// This is useful when multiple resources (e.g., pods, nodes) contribute targets to the same DNS record.
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//
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// TODO: move this to endpoint/utils.go
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func MergeEndpoints(endpoints []*endpoint.Endpoint) []*endpoint.Endpoint {
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if len(endpoints) == 0 {
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return endpoints
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}
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endpointMap := make(map[endpoint.EndpointKey]*endpoint.Endpoint)
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cnameTargets := make(map[string]string) // DNSName+SetIdentifier -> first target seen
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for _, ep := range endpoints {
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if ep.RecordType == endpoint.RecordTypeCNAME && len(ep.Targets) == 0 {
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log.Debugf("Skipping CNAME endpoint %q with no targets", ep.DNSName)
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continue
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}
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key := endpoint.EndpointKey{
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DNSName: ep.DNSName,
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RecordType: ep.RecordType,
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SetIdentifier: ep.SetIdentifier,
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RecordTTL: ep.RecordTTL,
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}
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// CNAME records can only have one target per DNS spec, and they should not be merged.
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if ep.RecordType == endpoint.RecordTypeCNAME {
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key.Target = ep.Targets[0]
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cnameKey := ep.DNSName + "/" + ep.SetIdentifier
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if existing, ok := cnameTargets[cnameKey]; ok && existing != ep.Targets[0] {
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// This will be caught by the provider when it tries to create the record, but log a warning here to make it more obvious.
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// TODO: add metric for CNAME conflicts
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log.Warnf("Only one CNAME per name — %s CNAME %s and %s CNAME %s is invalid DNS. A resolver wouldn't know which canonical name to follow.", ep.DNSName, existing, ep.DNSName, ep.Targets[0])
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}
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cnameTargets[cnameKey] = ep.Targets[0]
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}
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if existing, ok := endpointMap[key]; ok {
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existing.Targets = append(existing.Targets, ep.Targets...)
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} else {
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endpointMap[key] = ep
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}
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}
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result := make([]*endpoint.Endpoint, 0, len(endpointMap))
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for _, ep := range endpointMap {
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slices.Sort(ep.Targets)
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ep.Targets = slices.Compact(ep.Targets)
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result = append(result, ep)
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}
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return result
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}
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