mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-10-27 00:31:09 +01:00
ec07f45c8e
* Make suitableType() be Endpoint method With this change it becomes possible to work with endpoint of empty type in packages other than "provider". Also it seems logical for a smart property getter without side effects to be a method rather than a function in different package * Make plan computation work correctly with multi-target domains * fix drawing * drop comments * fix boilerplate header * fix comment * fix the bug with empty map * rework registry to support random lables * serialize->serializeLabel function rename * golint for err variable naming * add additional test * add tests for current case where one resource can generate multiple endpoints * make labels have its own type, add serialization as a method * add comment for exported error * use greater rather than not equal zero * update changelog
100 lines
2.9 KiB
Go
100 lines
2.9 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 endpoint
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import (
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"errors"
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"fmt"
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"sort"
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"strings"
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)
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var (
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// ErrInvalidHeritage is returned when heritage was not found, or different heritage is found
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ErrInvalidHeritage = errors.New("heritage is unknown or not found")
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)
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const (
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heritage = "external-dns"
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// OwnerLabelKey is the name of the label that defines the owner of an Endpoint.
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OwnerLabelKey = "owner"
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// ResourceLabelKey is the name of the label that identifies k8s resource which wants to acquire the DNS name
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ResourceLabelKey = "resource"
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)
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// Labels store metadata related to the endpoint
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// it is then stored in a persistent storage via serialization
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type Labels map[string]string
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// NewLabels returns empty Labels
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func NewLabels() Labels {
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return map[string]string{}
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}
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// NewLabelsFromString constructs endpoints labels from a provided format string
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// if heritage set to another value is found then error is returned
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// no heritage automatically assumes is not owned by external-dns and returns invalidHeritage error
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func NewLabelsFromString(labelText string) (Labels, error) {
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endpointLabels := map[string]string{}
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labelText = strings.Trim(labelText, "\"") // drop quotes
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tokens := strings.Split(labelText, ",")
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foundExternalDNSHeritage := false
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for _, token := range tokens {
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if len(strings.Split(token, "=")) != 2 {
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continue
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}
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key := strings.Split(token, "=")[0]
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val := strings.Split(token, "=")[1]
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if key == "heritage" && val != heritage {
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return nil, ErrInvalidHeritage
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}
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if key == "heritage" {
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foundExternalDNSHeritage = true
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continue
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}
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if strings.HasPrefix(key, heritage) {
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endpointLabels[strings.TrimPrefix(key, heritage+"/")] = val
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}
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}
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if !foundExternalDNSHeritage {
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return nil, ErrInvalidHeritage
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}
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return endpointLabels, nil
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}
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// Serialize transforms endpoints labels into a external-dns recognizable format string
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// withQuotes adds additional quotes
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func (l Labels) Serialize(withQuotes bool) string {
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var tokens []string
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tokens = append(tokens, fmt.Sprintf("heritage=%s", heritage))
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var keys []string
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for key := range l {
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keys = append(keys, key)
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}
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sort.Strings(keys) // sort for consistency
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for _, key := range keys {
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tokens = append(tokens, fmt.Sprintf("%s/%s=%s", heritage, key, l[key]))
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}
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if withQuotes {
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return fmt.Sprintf("\"%s\"", strings.Join(tokens, ","))
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}
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return strings.Join(tokens, ",")
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}
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