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handler.go
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handler.go
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// SPDX-FileCopyrightText: SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package azureprivate
import (
"context"
"fmt"
"strconv"
"strings"
azure "github.com/Azure/azure-sdk-for-go/services/privatedns/mgmt/2018-09-01/privatedns"
"github.com/gardener/controller-manager-library/pkg/logger"
"github.com/gardener/external-dns-management/pkg/controller/provider/azure/utils"
"github.com/gardener/external-dns-management/pkg/dns"
"github.com/gardener/external-dns-management/pkg/dns/provider"
perrs "github.com/gardener/external-dns-management/pkg/dns/provider/errors"
)
type Handler struct {
provider.DefaultDNSHandler
config provider.DNSHandlerConfig
cache provider.ZoneCache
ctx context.Context
zonesClient *azure.PrivateZonesClient
recordsClient *azure.RecordSetsClient
}
var _ provider.DNSHandler = &Handler{}
func NewHandler(c *provider.DNSHandlerConfig) (provider.DNSHandler, error) {
h := &Handler{
DefaultDNSHandler: provider.NewDefaultDNSHandler(TYPE_CODE),
config: *c,
}
h.ctx = c.Context
subscriptionID, authorizer, err := utils.GetSubscriptionIDAndAuthorizer(c)
if err != nil {
return nil, err
}
zonesClient := azure.NewPrivateZonesClient(subscriptionID)
recordsClient := azure.NewRecordSetsClient(subscriptionID)
zonesClient.Authorizer = authorizer
recordsClient.Authorizer = authorizer
// dummy call to check authentication
var one int32 = 1
ctx := context.TODO()
h.config.RateLimiter.Accept()
_, err = zonesClient.List(ctx, &one)
if err != nil {
return nil, perrs.WrapAsHandlerError(err, "Authentication test to Azure with client credentials failed. Please check secret for DNSProvider.")
}
h.zonesClient = &zonesClient
h.recordsClient = &recordsClient
h.cache, err = c.ZoneCacheFactory.CreateZoneCache(provider.CacheZoneState, c.Metrics, h.getZones, h.getZoneState)
if err != nil {
return nil, err
}
return h, nil
}
func (h *Handler) Release() {
h.cache.Release()
}
func (h *Handler) GetZones() (provider.DNSHostedZones, error) {
return h.cache.GetZones()
}
func (h *Handler) getZones(_ provider.ZoneCache) (provider.DNSHostedZones, error) {
zones := provider.DNSHostedZones{}
h.config.RateLimiter.Accept()
results, err := h.zonesClient.ListComplete(h.ctx, nil)
h.config.Metrics.AddGenericRequests(provider.M_LISTZONES, 1)
if err != nil {
return nil, perrs.WrapAsHandlerError(err, "Listing DNS zones failed")
}
ctx := context.Background()
blockedZones := h.config.Options.AdvancedOptions.GetBlockedZones()
for results.NotDone() {
item := results.Value()
var zoneID string
resourceGroup, err := utils.ExtractResourceGroup(*item.ID)
if err != nil {
logger.Warnf("skipping zone: %s", err)
} else {
zoneID = utils.MakeZoneID(resourceGroup, *item.Name)
if blockedZones.Contains(zoneID) {
h.config.Logger.Infof("ignoring blocked zone id: %s", zoneID)
zoneID = ""
}
}
if zoneID != "" {
// ResourceGroup needed for requests to Azure. Remember by adding to Id. Split by calling splitZoneid().
hostedZone := provider.NewDNSHostedZone(h.ProviderType(), zoneID, dns.NormalizeHostname(*item.Name), "", true)
zones = append(zones, hostedZone)
}
if err := results.NextWithContext(ctx); err != nil {
return nil, err
}
}
return zones, nil
}
func (h *Handler) GetZoneState(zone provider.DNSHostedZone) (provider.DNSZoneState, error) {
return h.cache.GetZoneState(zone)
}
func (h *Handler) getZoneState(zone provider.DNSHostedZone, _ provider.ZoneCache) (provider.DNSZoneState, error) {
dnssets := dns.DNSSets{}
resourceGroup, zoneName := utils.SplitZoneID(zone.Id().ID)
h.config.RateLimiter.Accept()
results, err := h.recordsClient.ListComplete(h.ctx, resourceGroup, zoneName, nil, "")
h.config.Metrics.AddZoneRequests(zone.Id().ID, provider.M_LISTRECORDS, 1)
if err != nil {
return nil, perrs.WrapfAsHandlerError(err, "Listing DNS zone state for zone %s failed", zoneName)
}
ctx := context.Background()
count := 0
for results.NotDone() {
count++
item := results.Value()
// We expect recordName.DNSZone. However Azure only return recordName . Reverse is dropZoneName() needed for calls to Azure
fullName := fmt.Sprintf("%s.%s", *item.Name, zoneName)
if item.ARecords != nil {
rs := dns.NewRecordSet(dns.RS_A, *item.TTL, nil)
for _, record := range *item.ARecords {
rs.Add(&dns.Record{Value: *record.Ipv4Address})
}
dnssets.AddRecordSetFromProvider(fullName, rs)
}
if item.AaaaRecords != nil {
rs := dns.NewRecordSet(dns.RS_AAAA, *item.TTL, nil)
for _, record := range *item.AaaaRecords {
rs.Add(&dns.Record{Value: *record.Ipv6Address})
}
dnssets.AddRecordSetFromProvider(fullName, rs)
}
if item.CnameRecord != nil {
rs := dns.NewRecordSet(dns.RS_CNAME, *item.TTL, nil)
rs.Add(&dns.Record{Value: *item.CnameRecord.Cname})
dnssets.AddRecordSetFromProvider(fullName, rs)
}
if item.TxtRecords != nil {
rs := dns.NewRecordSet(dns.RS_TXT, *item.TTL, nil)
for _, record := range *item.TxtRecords {
quoted := strings.Join(*record.Value, "\n")
// AzureDNS stores values unquoted, but it is expected to be quoted in dns.Record
if len(quoted) > 0 && quoted[0] != '"' && quoted[len(quoted)-1] != '"' {
quoted = strconv.Quote(quoted)
}
rs.Add(&dns.Record{Value: quoted})
}
dnssets.AddRecordSetFromProvider(fullName, rs)
}
if err := results.NextWithContext(ctx); err != nil {
return nil, err
}
}
pages := count / 100
if pages > 0 {
h.config.Metrics.AddZoneRequests(zone.Id().ID, provider.M_PLISTRECORDS, count/100)
}
return provider.NewDNSZoneState(dnssets), nil
}
func (h *Handler) ReportZoneStateConflict(zone provider.DNSHostedZone, err error) bool {
return h.cache.ReportZoneStateConflict(zone, err)
}
func (h *Handler) ExecuteRequests(logger logger.LogContext, zone provider.DNSHostedZone, state provider.DNSZoneState, reqs []*provider.ChangeRequest) error {
err := h.executeRequests(logger, zone, state, reqs)
h.cache.ApplyRequests(logger, err, zone, reqs)
return err
}
func (h *Handler) executeRequests(logger logger.LogContext, zone provider.DNSHostedZone, _ provider.DNSZoneState, reqs []*provider.ChangeRequest) error {
resourceGroup, zoneName := utils.SplitZoneID(zone.Id().ID)
exec := NewExecution(logger, h, resourceGroup, zoneName)
var succeeded, failed int
for _, r := range reqs {
status, recordType, rset := exec.buildRecordSet(r)
switch status {
case bs_empty:
continue
case bs_dryrun:
continue
case bs_invalidType:
err := fmt.Errorf("Unexpected record type: %s", r.Type)
if r.Done != nil {
r.Done.SetInvalid(err)
}
continue
case bs_invalidName:
err := fmt.Errorf("Unexpected dns name: %s", *rset.Name)
if r.Done != nil {
r.Done.SetInvalid(err)
}
continue
case bs_invalidRoutingPolicy:
err := fmt.Errorf("Routing policies not supported for " + TYPE_CODE)
if r.Done != nil {
r.Done.SetInvalid(err)
}
continue
}
err := exec.apply(r.Action, recordType, rset, h.config.Metrics)
if err != nil {
failed++
logger.Infof("Apply failed with %s", err.Error())
if r.Done != nil {
r.Done.Failed(err)
}
} else {
succeeded++
if r.Done != nil {
r.Done.Succeeded()
}
}
}
if h.config.DryRun {
logger.Infof("no changes in dryrun mode for Azure")
return nil
}
if succeeded > 0 {
logger.Infof("Succeeded updates for records in zone %s: %d", zoneName, succeeded)
}
if failed > 0 {
logger.Infof("Failed updates for records in zone %s: %d", zoneName, failed)
return fmt.Errorf("%d changes failed", failed)
}
return nil
}