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handler.go
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handler.go
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/*
* Copyright 2019 SAP SE or an SAP affiliate company. All rights reserved. h file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
*
* 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
*
*/
package azure
import (
"context"
"fmt"
"regexp"
"strconv"
"strings"
azure "github.com/Azure/azure-sdk-for-go/services/dns/mgmt/2018-05-01/dns"
"github.com/Azure/go-autorest/autorest/azure/auth"
"github.com/gardener/controller-manager-library/pkg/logger"
"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.ZonesClient
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, err := c.GetRequiredProperty("AZURE_SUBSCRIPTION_ID", "subscriptionID")
if err != nil {
return nil, err
}
// see https://docs.microsoft.com/en-us/go/azure/azure-sdk-go-authorization
clientID, err := c.GetRequiredProperty("AZURE_CLIENT_ID", "clientID")
if err != nil {
return nil, err
}
clientSecret, err := c.GetRequiredProperty("AZURE_CLIENT_SECRET", "clientSecret")
if err != nil {
return nil, err
}
tenantID, err := c.GetRequiredProperty("AZURE_TENANT_ID", "tenantID")
if err != nil {
return nil, err
}
authorizer, err := auth.NewClientCredentialsConfig(clientID, clientSecret, tenantID).Authorizer()
if err != nil {
return nil, perrs.WrapAsHandlerError(err, "Creating Azure authorizer with client credentials failed")
}
zonesClient := azure.NewZonesClient(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 = provider.NewZoneCache(c.CacheConfig, c.Metrics, nil, h.getZones, h.getZoneState)
if err != nil {
return nil, err
}
return h, nil
}
var re = regexp.MustCompile("/resourceGroups/([^/]+)/")
func (h *Handler) Release() {
h.cache.Release()
}
func (h *Handler) GetZones() (provider.DNSHostedZones, error) {
return h.cache.GetZones()
}
func (h *Handler) getZones(cache 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")
}
blockedZones := h.config.Options.AdvancedOptions.GetBlockedZones()
for ; results.NotDone(); results.Next() {
item := results.Value()
submatches := re.FindStringSubmatch(*item.ID)
if len(submatches) != 2 {
logger.Warnf("Unexpected DNS Zone ID: '%s'. Skipping zone", *item.ID)
continue
}
resourceGroup := submatches[1]
zoneID := makeZoneID(resourceGroup, *item.Name)
if blockedZones.Contains(zoneID) {
h.config.Logger.Infof("ignoring blocked zone id: %s", zoneID)
continue
}
forwarded := h.collectForwardedSubzones(resourceGroup, *item.Name)
// 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), "", forwarded, false)
zones = append(zones, hostedZone)
}
return zones, nil
}
func (h *Handler) collectForwardedSubzones(resourceGroup, zoneName string) []string {
forwarded := []string{}
// There should only few NS entries. Therefore no paging is performed for simplicity.
var top int32 = 1000
h.config.RateLimiter.Accept()
result, err := h.recordsClient.ListByType(h.ctx, resourceGroup, zoneName, azure.NS, &top, "")
zoneID := makeZoneID(resourceGroup, zoneName)
h.config.Metrics.AddZoneRequests(zoneID, provider.M_LISTRECORDS, 1)
if err != nil {
logger.Infof("Failed fetching NS records for %s: %s", zoneName, err.Error())
// just ignoring it
return forwarded
}
for _, item := range result.Values() {
if *item.Name != "@" && item.NsRecords != nil && len(*item.NsRecords) > 0 {
fullDomainName := *item.Name + "." + zoneName
forwarded = append(forwarded, fullDomainName)
}
}
return forwarded
}
func makeZoneID(resourceGroup, zoneName string) string {
return resourceGroup + "/" + zoneName
}
func splitZoneid(zoneid string) (string, string) {
parts := strings.Split(zoneid, "/")
if len(parts) != 2 {
return "", zoneid
}
return parts[0], parts[1]
}
func (h *Handler) GetZoneState(zone provider.DNSHostedZone) (provider.DNSZoneState, error) {
return h.cache.GetZoneState(zone)
}
func (h *Handler) getZoneState(zone provider.DNSHostedZone, cache provider.ZoneCache) (provider.DNSZoneState, error) {
dnssets := dns.DNSSets{}
resourceGroup, zoneName := splitZoneid(zone.Id())
h.config.RateLimiter.Accept()
results, err := h.recordsClient.ListAllByDNSZoneComplete(h.ctx, resourceGroup, zoneName, nil, "")
h.config.Metrics.AddZoneRequests(zone.Id(), provider.M_LISTRECORDS, 1)
if err != nil {
return nil, perrs.WrapfAsHandlerError(err, "Listing DNS zone state for zone %s failed", zoneName)
}
count := 0
for ; results.NotDone(); results.Next() {
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.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)
}
}
pages := count / 100
if pages > 0 {
h.config.Metrics.AddZoneRequests(zone.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, state provider.DNSZoneState, reqs []*provider.ChangeRequest) error {
resourceGroup, zoneName := splitZoneid(zone.Id())
exec := NewExecution(logger, h, resourceGroup, zoneName)
var succeeded, failed int
for _, r := range reqs {
status, recordType, rset := exec.buildRecordSet(r)
if status == bs_empty || status == bs_dryrun {
continue
} else if status == bs_invalidType {
err := fmt.Errorf("Unexpected record type: %s", r.Type)
if r.Done != nil {
r.Done.SetInvalid(err)
}
continue
} else if status == bs_invalidName {
err := fmt.Errorf("Unexpected dns name: %s", *rset.Name)
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
}