mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-07 10:06:57 +02:00
fab942f486
The controller will retrieve all the endpoints at the beginning of its loop. When changes need to be applied, the provider may need to query the endpoints again. Allow the provider to skip the queries if its data was cached.
90 lines
2.9 KiB
Go
90 lines
2.9 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package registry
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
|
|
"github.com/kubernetes-incubator/external-dns/endpoint"
|
|
"github.com/kubernetes-incubator/external-dns/plan"
|
|
"github.com/kubernetes-incubator/external-dns/provider"
|
|
)
|
|
|
|
// AWSSDRegistry implements registry interface with ownership information associated via the Description field of SD Service
|
|
type AWSSDRegistry struct {
|
|
provider provider.Provider
|
|
ownerID string
|
|
}
|
|
|
|
// NewAWSSDRegistry returns implementation of registry for AWS SD
|
|
func NewAWSSDRegistry(provider provider.Provider, ownerID string) (*AWSSDRegistry, error) {
|
|
if ownerID == "" {
|
|
return nil, errors.New("owner id cannot be empty")
|
|
}
|
|
return &AWSSDRegistry{
|
|
provider: provider,
|
|
ownerID: ownerID,
|
|
}, nil
|
|
}
|
|
|
|
// Records calls AWS SD API and expects AWS SD provider to provider Owner/Resource information as a serialized
|
|
// value in the AWSSDDescriptionLabel value in the Labels map
|
|
func (sdr *AWSSDRegistry) Records() ([]*endpoint.Endpoint, error) {
|
|
records, err := sdr.provider.Records()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, record := range records {
|
|
labels, err := endpoint.NewLabelsFromString(record.Labels[endpoint.AWSSDDescriptionLabel])
|
|
if err != nil {
|
|
// if we fail to parse the output then simply assume the endpoint is not managed by any instance of External DNS
|
|
record.Labels = endpoint.NewLabels()
|
|
continue
|
|
}
|
|
record.Labels = labels
|
|
}
|
|
|
|
return records, nil
|
|
}
|
|
|
|
// ApplyChanges filters out records not owned the External-DNS, additionally it adds the required label
|
|
// inserted in the AWS SD instance as a CreateID field
|
|
func (sdr *AWSSDRegistry) ApplyChanges(ctx context.Context, changes *plan.Changes) error {
|
|
filteredChanges := &plan.Changes{
|
|
Create: changes.Create,
|
|
UpdateNew: filterOwnedRecords(sdr.ownerID, changes.UpdateNew),
|
|
UpdateOld: filterOwnedRecords(sdr.ownerID, changes.UpdateOld),
|
|
Delete: filterOwnedRecords(sdr.ownerID, changes.Delete),
|
|
}
|
|
|
|
sdr.updateLabels(filteredChanges.Create)
|
|
sdr.updateLabels(filteredChanges.UpdateNew)
|
|
sdr.updateLabels(filteredChanges.UpdateOld)
|
|
sdr.updateLabels(filteredChanges.Delete)
|
|
|
|
return sdr.provider.ApplyChanges(ctx, filteredChanges)
|
|
}
|
|
|
|
func (sdr *AWSSDRegistry) updateLabels(endpoints []*endpoint.Endpoint) {
|
|
for _, ep := range endpoints {
|
|
ep.Labels[endpoint.OwnerLabelKey] = sdr.ownerID
|
|
ep.Labels[endpoint.AWSSDDescriptionLabel] = ep.Labels.Serialize(false)
|
|
}
|
|
}
|