forked from kubernetes-sigs/external-dns
-
Notifications
You must be signed in to change notification settings - Fork 0
/
google.go
338 lines (265 loc) · 9.77 KB
/
google.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*
Copyright 2017 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 provider
import (
"strings"
"github.com/linki/instrumented_http"
log "github.com/sirupsen/logrus"
dns "google.golang.org/api/dns/v1"
"golang.org/x/net/context"
"golang.org/x/oauth2/google"
googleapi "google.golang.org/api/googleapi"
"github.com/kubernetes-incubator/external-dns/endpoint"
"github.com/kubernetes-incubator/external-dns/plan"
)
const (
googleRecordTTL = 300
)
type managedZonesCreateCallInterface interface {
Do(opts ...googleapi.CallOption) (*dns.ManagedZone, error)
}
type managedZonesListCallInterface interface {
Pages(ctx context.Context, f func(*dns.ManagedZonesListResponse) error) error
}
type managedZonesServiceInterface interface {
Create(project string, managedzone *dns.ManagedZone) managedZonesCreateCallInterface
List(project string) managedZonesListCallInterface
}
type resourceRecordSetsListCallInterface interface {
Pages(ctx context.Context, f func(*dns.ResourceRecordSetsListResponse) error) error
}
type resourceRecordSetsClientInterface interface {
List(project string, managedZone string) resourceRecordSetsListCallInterface
}
type changesCreateCallInterface interface {
Do(opts ...googleapi.CallOption) (*dns.Change, error)
}
type changesServiceInterface interface {
Create(project string, managedZone string, change *dns.Change) changesCreateCallInterface
}
type resourceRecordSetsService struct {
service *dns.ResourceRecordSetsService
}
func (r resourceRecordSetsService) List(project string, managedZone string) resourceRecordSetsListCallInterface {
return r.service.List(project, managedZone)
}
type managedZonesService struct {
service *dns.ManagedZonesService
}
func (m managedZonesService) Create(project string, managedzone *dns.ManagedZone) managedZonesCreateCallInterface {
return m.service.Create(project, managedzone)
}
func (m managedZonesService) List(project string) managedZonesListCallInterface {
return m.service.List(project)
}
type changesService struct {
service *dns.ChangesService
}
func (c changesService) Create(project string, managedZone string, change *dns.Change) changesCreateCallInterface {
return c.service.Create(project, managedZone, change)
}
// GoogleProvider is an implementation of Provider for Google CloudDNS.
type GoogleProvider struct {
// The Google project to work in
project string
// Enabled dry-run will print any modifying actions rather than execute them.
dryRun bool
// only consider hosted zones managing domains ending in this suffix
domainFilter DomainFilter
// A client for managing resource record sets
resourceRecordSetsClient resourceRecordSetsClientInterface
// A client for managing hosted zones
managedZonesClient managedZonesServiceInterface
// A client for managing change sets
changesClient changesServiceInterface
}
// NewGoogleProvider initializes a new Google CloudDNS based Provider.
func NewGoogleProvider(project string, domainFilter DomainFilter, dryRun bool) (*GoogleProvider, error) {
gcloud, err := google.DefaultClient(context.TODO(), dns.NdevClouddnsReadwriteScope)
if err != nil {
return nil, err
}
gcloud = instrumented_http.NewClient(gcloud, &instrumented_http.Callbacks{
PathProcessor: func(path string) string {
parts := strings.Split(path, "/")
return parts[len(parts)-1]
},
})
dnsClient, err := dns.New(gcloud)
if err != nil {
return nil, err
}
provider := &GoogleProvider{
project: project,
domainFilter: domainFilter,
dryRun: dryRun,
resourceRecordSetsClient: resourceRecordSetsService{dnsClient.ResourceRecordSets},
managedZonesClient: managedZonesService{dnsClient.ManagedZones},
changesClient: changesService{dnsClient.Changes},
}
return provider, nil
}
// Zones returns the list of hosted zones.
func (p *GoogleProvider) Zones() (map[string]*dns.ManagedZone, error) {
zones := make(map[string]*dns.ManagedZone)
f := func(resp *dns.ManagedZonesListResponse) error {
for _, zone := range resp.ManagedZones {
if p.domainFilter.Match(zone.DnsName) {
zones[zone.Name] = zone
}
}
return nil
}
if err := p.managedZonesClient.List(p.project).Pages(context.TODO(), f); err != nil {
return nil, err
}
return zones, nil
}
// Records returns the list of records in all relevant zones.
func (p *GoogleProvider) Records() (endpoints []*endpoint.Endpoint, _ error) {
zones, err := p.Zones()
if err != nil {
return nil, err
}
f := func(resp *dns.ResourceRecordSetsListResponse) error {
for _, r := range resp.Rrsets {
for _, rr := range r.Rrdatas {
// each page is processed sequentially, no need for a mutex here.
if supportedRecordType(r.Type) {
endpoints = append(endpoints, endpoint.NewEndpoint(r.Name, rr, r.Type))
}
}
}
return nil
}
for _, z := range zones {
if err := p.resourceRecordSetsClient.List(p.project, z.Name).Pages(context.TODO(), f); err != nil {
return nil, err
}
}
return endpoints, nil
}
// CreateRecords creates a given set of DNS records in the given hosted zone.
func (p *GoogleProvider) CreateRecords(endpoints []*endpoint.Endpoint) error {
change := &dns.Change{}
change.Additions = append(change.Additions, newRecords(endpoints)...)
return p.submitChange(change)
}
// UpdateRecords updates a given set of old records to a new set of records in a given hosted zone.
func (p *GoogleProvider) UpdateRecords(records, oldRecords []*endpoint.Endpoint) error {
change := &dns.Change{}
change.Additions = append(change.Additions, newRecords(records)...)
change.Deletions = append(change.Deletions, newRecords(oldRecords)...)
return p.submitChange(change)
}
// DeleteRecords deletes a given set of DNS records in a given zone.
func (p *GoogleProvider) DeleteRecords(endpoints []*endpoint.Endpoint) error {
change := &dns.Change{}
change.Deletions = append(change.Deletions, newRecords(endpoints)...)
return p.submitChange(change)
}
// ApplyChanges applies a given set of changes in a given zone.
func (p *GoogleProvider) ApplyChanges(changes *plan.Changes) error {
change := &dns.Change{}
change.Additions = append(change.Additions, newRecords(changes.Create)...)
change.Additions = append(change.Additions, newRecords(changes.UpdateNew)...)
change.Deletions = append(change.Deletions, newRecords(changes.UpdateOld)...)
change.Deletions = append(change.Deletions, newRecords(changes.Delete)...)
return p.submitChange(change)
}
// submitChange takes a zone and a Change and sends it to Google.
func (p *GoogleProvider) submitChange(change *dns.Change) error {
if len(change.Additions) == 0 && len(change.Deletions) == 0 {
log.Info("All records are already up to date")
return nil
}
for _, del := range change.Deletions {
log.Infof("Del records: %s %s %s", del.Name, del.Type, del.Rrdatas)
}
for _, add := range change.Additions {
log.Infof("Add records: %s %s %s", add.Name, add.Type, add.Rrdatas)
}
if p.dryRun {
return nil
}
zones, err := p.Zones()
if err != nil {
return err
}
// separate into per-zone change sets to be passed to the API.
changes := separateChange(zones, change)
for z, c := range changes {
if _, err := p.changesClient.Create(p.project, z, c).Do(); err != nil {
return err
}
}
return nil
}
// separateChange separates a multi-zone change into a single change per zone.
func separateChange(zones map[string]*dns.ManagedZone, change *dns.Change) map[string]*dns.Change {
changes := make(map[string]*dns.Change)
zoneNameIDMapper := zoneIDName{}
for _, z := range zones {
zoneNameIDMapper[z.Name] = z.DnsName
changes[z.Name] = &dns.Change{
Additions: []*dns.ResourceRecordSet{},
Deletions: []*dns.ResourceRecordSet{},
}
}
for _, a := range change.Additions {
if zoneName, _ := zoneNameIDMapper.FindZone(ensureTrailingDot(a.Name)); zoneName != "" {
changes[zoneName].Additions = append(changes[zoneName].Additions, a)
}
}
for _, d := range change.Deletions {
if zoneName, _ := zoneNameIDMapper.FindZone(ensureTrailingDot(d.Name)); zoneName != "" {
changes[zoneName].Deletions = append(changes[zoneName].Deletions, d)
}
}
// separating a change could lead to empty sub changes, remove them here.
for zone, change := range changes {
if len(change.Additions) == 0 && len(change.Deletions) == 0 {
delete(changes, zone)
}
}
return changes
}
// newRecords returns a collection of RecordSets based on the given endpoints.
func newRecords(endpoints []*endpoint.Endpoint) []*dns.ResourceRecordSet {
records := make([]*dns.ResourceRecordSet, len(endpoints))
for i, endpoint := range endpoints {
records[i] = newRecord(endpoint)
}
return records
}
// newRecord returns a RecordSet based on the given endpoint.
func newRecord(ep *endpoint.Endpoint) *dns.ResourceRecordSet {
// TODO(linki): works around appending a trailing dot to TXT records. I think
// we should go back to storing DNS names with a trailing dot internally. This
// way we can use it has is here and trim it off if it exists when necessary.
target := ep.Target
if ep.RecordType == endpoint.RecordTypeCNAME {
target = ensureTrailingDot(target)
}
// no annotation results in a Ttl of 0, default to 300 for backwards-compatability
var ttl int64 = googleRecordTTL
if ep.RecordTTL.IsConfigured() {
ttl = int64(ep.RecordTTL)
}
return &dns.ResourceRecordSet{
Name: ensureTrailingDot(ep.DNSName),
Rrdatas: []string{target},
Ttl: ttl,
Type: ep.RecordType,
}
}