mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-10-30 18:20:59 +01:00
301 lines
8.4 KiB
Go
301 lines
8.4 KiB
Go
/*
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Copyright 2018 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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"io/ioutil"
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"strings"
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"github.com/oracle/oci-go-sdk/common"
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"github.com/oracle/oci-go-sdk/dns"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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yaml "gopkg.in/yaml.v2"
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"github.com/kubernetes-sigs/external-dns/endpoint"
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"github.com/kubernetes-sigs/external-dns/plan"
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)
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const ociRecordTTL = 300
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// OCIAuthConfig holds connection parameters for the OCI API.
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type OCIAuthConfig struct {
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Region string `yaml:"region"`
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TenancyID string `yaml:"tenancy"`
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UserID string `yaml:"user"`
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PrivateKey string `yaml:"key"`
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Fingerprint string `yaml:"fingerprint"`
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Passphrase string `yaml:"passphrase"`
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}
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// OCIConfig holds the configuration for the OCI Provider.
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type OCIConfig struct {
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Auth OCIAuthConfig `yaml:"auth"`
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CompartmentID string `yaml:"compartment"`
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}
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// OCIProvider is an implementation of Provider for Oracle Cloud Infrastructure
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// (OCI) DNS.
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type OCIProvider struct {
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client ociDNSClient
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cfg OCIConfig
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domainFilter DomainFilter
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zoneIDFilter ZoneIDFilter
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dryRun bool
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}
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// ociDNSClient is the subset of the OCI DNS API required by the OCI Provider.
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type ociDNSClient interface {
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ListZones(ctx context.Context, request dns.ListZonesRequest) (response dns.ListZonesResponse, err error)
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GetZoneRecords(ctx context.Context, request dns.GetZoneRecordsRequest) (response dns.GetZoneRecordsResponse, err error)
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PatchZoneRecords(ctx context.Context, request dns.PatchZoneRecordsRequest) (response dns.PatchZoneRecordsResponse, err error)
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}
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// LoadOCIConfig reads and parses the OCI ExternalDNS config file at the given
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// path.
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func LoadOCIConfig(path string) (*OCIConfig, error) {
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contents, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, errors.Wrapf(err, "reading OCI config file %q", path)
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}
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cfg := OCIConfig{}
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if err := yaml.Unmarshal(contents, &cfg); err != nil {
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return nil, errors.Wrapf(err, "parsing OCI config file %q", path)
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}
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return &cfg, nil
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}
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// NewOCIProvider initialises a new OCI DNS based Provider.
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func NewOCIProvider(cfg OCIConfig, domainFilter DomainFilter, zoneIDFilter ZoneIDFilter, dryRun bool) (*OCIProvider, error) {
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var client ociDNSClient
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client, err := dns.NewDnsClientWithConfigurationProvider(common.NewRawConfigurationProvider(
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cfg.Auth.TenancyID,
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cfg.Auth.UserID,
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cfg.Auth.Region,
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cfg.Auth.Fingerprint,
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cfg.Auth.PrivateKey,
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&cfg.Auth.Passphrase,
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))
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if err != nil {
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return nil, errors.Wrap(err, "initialising OCI DNS API client")
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}
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return &OCIProvider{
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client: client,
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cfg: cfg,
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domainFilter: domainFilter,
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zoneIDFilter: zoneIDFilter,
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dryRun: dryRun,
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}, nil
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}
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func (p *OCIProvider) zones(ctx context.Context) (map[string]dns.ZoneSummary, error) {
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zones := make(map[string]dns.ZoneSummary)
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log.Debugf("Matching zones against domain filters: %v", p.domainFilter.filters)
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var page *string
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for {
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resp, err := p.client.ListZones(ctx, dns.ListZonesRequest{
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CompartmentId: &p.cfg.CompartmentID,
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ZoneType: dns.ListZonesZoneTypePrimary,
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Page: page,
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})
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if err != nil {
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return nil, errors.Wrapf(err, "listing zones in %q", p.cfg.CompartmentID)
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}
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for _, zone := range resp.Items {
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if p.domainFilter.Match(*zone.Name) && p.zoneIDFilter.Match(*zone.Id) {
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zones[*zone.Name] = zone
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log.Debugf("Matched %q (%q)", *zone.Name, *zone.Id)
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} else {
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log.Debugf("Filtered %q (%q)", *zone.Name, *zone.Id)
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}
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}
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if page = resp.OpcNextPage; resp.OpcNextPage == nil {
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break
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}
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}
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if len(zones) == 0 {
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if p.domainFilter.IsConfigured() {
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log.Warnf("No zones in compartment %q match domain filters %v", p.cfg.CompartmentID, p.domainFilter.filters)
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} else {
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log.Warnf("No zones found in compartment %q", p.cfg.CompartmentID)
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}
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}
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return zones, nil
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}
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func (p *OCIProvider) newFilteredRecordOperations(endpoints []*endpoint.Endpoint, opType dns.RecordOperationOperationEnum) []dns.RecordOperation {
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ops := []dns.RecordOperation{}
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for _, endpoint := range endpoints {
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if p.domainFilter.Match(endpoint.DNSName) {
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ops = append(ops, newRecordOperation(endpoint, opType))
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}
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}
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return ops
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}
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// Records returns the list of records in a given hosted zone.
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func (p *OCIProvider) Records() ([]*endpoint.Endpoint, error) {
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ctx := context.Background()
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zones, err := p.zones(ctx)
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if err != nil {
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return nil, errors.Wrap(err, "getting zones")
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}
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endpoints := []*endpoint.Endpoint{}
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for _, zone := range zones {
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var page *string
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for {
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resp, err := p.client.GetZoneRecords(ctx, dns.GetZoneRecordsRequest{
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ZoneNameOrId: zone.Id,
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Page: page,
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CompartmentId: &p.cfg.CompartmentID,
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})
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if err != nil {
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return nil, errors.Wrapf(err, "getting records for zone %q", *zone.Id)
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}
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for _, record := range resp.Items {
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if !supportedRecordType(*record.Rtype) {
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continue
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}
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endpoints = append(endpoints,
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endpoint.NewEndpointWithTTL(
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*record.Domain,
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*record.Rtype,
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endpoint.TTL(*record.Ttl),
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*record.Rdata,
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),
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)
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}
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if page = resp.OpcNextPage; resp.OpcNextPage == nil {
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break
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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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// ApplyChanges applies a given set of changes to a given zone.
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func (p *OCIProvider) ApplyChanges(ctx context.Context, changes *plan.Changes) error {
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log.Debugf("Processing chages: %+v", changes)
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ops := []dns.RecordOperation{}
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ops = append(ops, p.newFilteredRecordOperations(changes.Create, dns.RecordOperationOperationAdd)...)
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ops = append(ops, p.newFilteredRecordOperations(changes.UpdateNew, dns.RecordOperationOperationAdd)...)
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ops = append(ops, p.newFilteredRecordOperations(changes.UpdateOld, dns.RecordOperationOperationRemove)...)
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ops = append(ops, p.newFilteredRecordOperations(changes.Delete, dns.RecordOperationOperationRemove)...)
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if len(ops) == 0 {
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log.Info("All records are already up to date")
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return nil
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}
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zones, err := p.zones(ctx)
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if err != nil {
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return errors.Wrap(err, "fetching zones")
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}
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// Separate into per-zone change sets to be passed to OCI API.
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opsByZone := operationsByZone(zones, ops)
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for zoneID, ops := range opsByZone {
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log.Infof("Change zone: %q", zoneID)
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for _, op := range ops {
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log.Info(op)
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}
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}
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if p.dryRun {
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return nil
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}
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for zoneID, ops := range opsByZone {
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if _, err := p.client.PatchZoneRecords(ctx, dns.PatchZoneRecordsRequest{
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CompartmentId: &p.cfg.CompartmentID,
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ZoneNameOrId: &zoneID,
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PatchZoneRecordsDetails: dns.PatchZoneRecordsDetails{Items: ops},
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}); err != nil {
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return err
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}
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}
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return nil
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}
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// newRecordOperation returns a RecordOperation based on a given endpoint.
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func newRecordOperation(ep *endpoint.Endpoint, opType dns.RecordOperationOperationEnum) dns.RecordOperation {
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targets := make([]string, len(ep.Targets))
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copy(targets, []string(ep.Targets))
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if ep.RecordType == endpoint.RecordTypeCNAME {
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targets[0] = ensureTrailingDot(targets[0])
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}
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rdata := strings.Join(targets, " ")
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ttl := ociRecordTTL
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if ep.RecordTTL.IsConfigured() {
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ttl = int(ep.RecordTTL)
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}
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return dns.RecordOperation{
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Domain: &ep.DNSName,
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Rdata: &rdata,
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Ttl: &ttl,
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Rtype: &ep.RecordType,
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Operation: opType,
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}
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}
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// operationsByZone segments a slice of RecordOperations by their zone.
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func operationsByZone(zones map[string]dns.ZoneSummary, ops []dns.RecordOperation) map[string][]dns.RecordOperation {
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changes := make(map[string][]dns.RecordOperation)
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zoneNameIDMapper := zoneIDName{}
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for _, z := range zones {
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zoneNameIDMapper.Add(*z.Id, *z.Name)
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changes[*z.Id] = []dns.RecordOperation{}
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}
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for _, op := range ops {
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if zoneID, _ := zoneNameIDMapper.FindZone(*op.Domain); zoneID != "" {
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changes[zoneID] = append(changes[zoneID], op)
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} else {
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log.Warnf("No matching zone for record operation %s", op)
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}
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}
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// Remove zones that don't have any changes.
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for zone, ops := range changes {
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if len(ops) == 0 {
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delete(changes, zone)
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}
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}
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return changes
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}
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