mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-10-27 08:41:29 +01:00
95 lines
3.0 KiB
Go
95 lines
3.0 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 provider
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import (
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"context"
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"net"
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"strings"
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"sigs.k8s.io/external-dns/endpoint"
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"sigs.k8s.io/external-dns/plan"
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)
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// Provider defines the interface DNS providers should implement.
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type Provider interface {
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Records(ctx context.Context) ([]*endpoint.Endpoint, error)
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ApplyChanges(ctx context.Context, changes *plan.Changes) error
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// AdjustEndpoints canonicalizes a set of candidate endpoints.
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// It is called with a set of candidate endpoints obtained from the various sources.
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// It returns a set modified as required by the provider. The provider is responsible for
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// adding, removing, and modifying the ProviderSpecific properties to match
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// the endpoints that the provider returns in `Records` so that the change plan will not have
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// unnecessary (potentially failing) changes. It may also modify other fields, add, or remove
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// Endpoints. It is permitted to modify the supplied endpoints.
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AdjustEndpoints(endpoints []*endpoint.Endpoint) ([]*endpoint.Endpoint, error)
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GetDomainFilter() endpoint.DomainFilter
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}
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type BaseProvider struct{}
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func (b BaseProvider) AdjustEndpoints(endpoints []*endpoint.Endpoint) ([]*endpoint.Endpoint, error) {
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return endpoints, nil
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}
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func (b BaseProvider) GetDomainFilter() endpoint.DomainFilter {
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return endpoint.DomainFilter{}
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}
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type contextKey struct {
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name string
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}
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func (k *contextKey) String() string { return "provider context value " + k.name }
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// RecordsContextKey is a context key. It can be used during ApplyChanges
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// to access previously cached records. The associated value will be of
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// type []*endpoint.Endpoint.
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var RecordsContextKey = &contextKey{"records"}
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// EnsureTrailingDot ensures that the hostname receives a trailing dot if it hasn't already.
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func EnsureTrailingDot(hostname string) string {
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if net.ParseIP(hostname) != nil {
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return hostname
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}
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return strings.TrimSuffix(hostname, ".") + "."
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}
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// Difference tells which entries need to be respectively
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// added, removed, or left untouched for "current" to be transformed to "desired"
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func Difference(current, desired []string) ([]string, []string, []string) {
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add, remove, leave := []string{}, []string{}, []string{}
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index := make(map[string]struct{}, len(current))
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for _, x := range current {
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index[x] = struct{}{}
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}
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for _, x := range desired {
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if _, found := index[x]; found {
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leave = append(leave, x)
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delete(index, x)
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} else {
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add = append(add, x)
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delete(index, x)
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}
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}
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for x := range index {
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remove = append(remove, x)
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}
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return add, remove, leave
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}
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