-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
dns.go
524 lines (431 loc) · 13.7 KB
/
dns.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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
/*
Copyright 2019 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 dns
import (
"context"
"errors"
"fmt"
"io"
"os"
"strings"
"github.com/digitalocean/godo"
"golang.org/x/oauth2"
"k8s.io/klog/v2"
"k8s.io/kops/dns-controller/pkg/dns"
"k8s.io/kops/dnsprovider/pkg/dnsprovider"
"k8s.io/kops/dnsprovider/pkg/dnsprovider/rrstype"
)
var _ dnsprovider.Interface = Interface{}
const (
ipPlaceholder = "203.0.113.123"
ProviderName = "digitalocean"
)
func init() {
dnsprovider.RegisterDNSProvider(ProviderName, func(config io.Reader) (dnsprovider.Interface, error) {
client, err := newClient()
if err != nil {
return nil, err
}
return NewProvider(client), nil
})
}
// TokenSource implements oauth2.TokenSource
type TokenSource struct {
AccessToken string
}
// Token returns oauth2.Token
func (t *TokenSource) Token() (*oauth2.Token, error) {
token := &oauth2.Token{
AccessToken: t.AccessToken,
}
return token, nil
}
func newClient() (*godo.Client, error) {
accessToken := os.Getenv("DIGITALOCEAN_ACCESS_TOKEN")
if accessToken == "" {
return nil, errors.New("DIGITALOCEAN_ACCESS_TOKEN is required")
}
tokenSource := &TokenSource{
AccessToken: accessToken,
}
oauthClient := oauth2.NewClient(context.TODO(), tokenSource)
return godo.NewClient(oauthClient), nil
}
// DNS implements dnsprovider.Interface
type Interface struct {
client *godo.Client
}
// NewProvider returns an implementation of dnsprovider.Interface
func NewProvider(client *godo.Client) dnsprovider.Interface {
return &Interface{client: client}
}
// Zones returns an implementation of dnsprovider.Zones
func (d Interface) Zones() (dnsprovider.Zones, bool) {
return &zones{
client: d.client,
}, true
}
// zones is an implementation of dnsprovider.Zones
type zones struct {
client *godo.Client
}
// List returns a list of all dns zones
func (z *zones) List() ([]dnsprovider.Zone, error) {
domains, err := listDomains(z.client)
if err != nil {
return nil, err
}
var newZone *zone
var zones []dnsprovider.Zone
for _, domain := range domains {
newZone = &zone{
name: domain.Name,
client: z.client,
}
zones = append(zones, newZone)
}
return zones, nil
}
// Add adds a new DNS zone
func (z *zones) Add(newZone dnsprovider.Zone) (dnsprovider.Zone, error) {
domainCreateRequest := &godo.DomainCreateRequest{
Name: newZone.Name(),
IPAddress: ipPlaceholder,
}
domain, err := createDomain(z.client, domainCreateRequest)
if err != nil {
return nil, err
}
return &zone{
name: domain.Name,
client: z.client,
}, nil
}
// Remove deletes a zone
func (z *zones) Remove(zone dnsprovider.Zone) error {
return deleteDomain(z.client, zone.Name())
}
// New returns a new implementation of dnsprovider.Zone
func (z *zones) New(name string) (dnsprovider.Zone, error) {
return &zone{
name: name,
client: z.client,
}, nil
}
// zone implements dnsprovider.Zone
type zone struct {
name string
client *godo.Client
}
// Name returns the Name of a dns zone
func (z *zone) Name() string {
return z.name
}
// ID returns the name of a dns zone, in DO the ID is the name
func (z *zone) ID() string {
return z.name
}
// ResourceRecordSet returns an implementation of dnsprovider.ResourceRecordSets
func (z *zone) ResourceRecordSets() (dnsprovider.ResourceRecordSets, bool) {
return &resourceRecordSets{zone: z, client: z.client}, true
}
// resourceRecordSets implements dnsprovider.ResourceRecordSet
type resourceRecordSets struct {
zone *zone
client *godo.Client
}
// List returns a list of dnsprovider.ResourceRecordSet
func (r *resourceRecordSets) List() ([]dnsprovider.ResourceRecordSet, error) {
records, err := getRecords(r.client, r.zone.Name())
if err != nil {
return nil, err
}
var rrsets []dnsprovider.ResourceRecordSet
rrsetsWithoutDups := make(map[string]*resourceRecordSet)
for _, record := range records {
// digitalocean API returns the record without the zone
// but the consumers of this interface expect the zone to be included
recordName := dns.EnsureDotSuffix(record.Name) + r.Zone().Name()
if set, ok := rrsetsWithoutDups[recordName]; !ok {
rrsetsWithoutDups[recordName] = &resourceRecordSet{
name: recordName,
data: []string{record.Data},
ttl: record.TTL,
recordType: rrstype.RrsType(record.Type),
}
} else {
set.data = append(set.data, record.Data)
}
}
for _, set := range rrsetsWithoutDups {
rrsets = append(rrsets, set)
}
return rrsets, nil
}
// Get returns a list of dnsprovider.ResourceRecordSet that matches the name parameter
func (r *resourceRecordSets) Get(name string) ([]dnsprovider.ResourceRecordSet, error) {
records, err := r.List()
if err != nil {
return nil, err
}
var recordSets []dnsprovider.ResourceRecordSet
for _, record := range records {
if record.Name() == name {
recordSets = append(recordSets, record)
}
}
return recordSets, nil
}
// New returns an implementation of dnsprovider.ResourceRecordSet
func (r *resourceRecordSets) New(name string, rrdatas []string, ttl int64, rrstype rrstype.RrsType) dnsprovider.ResourceRecordSet {
if len(rrdatas) == 0 {
return nil
}
return &resourceRecordSet{
name: name,
data: rrdatas,
ttl: int(ttl),
recordType: rrstype,
}
}
// StartChangeset returns an implementation of dnsprovider.ResourceRecordChangeset
func (r *resourceRecordSets) StartChangeset() dnsprovider.ResourceRecordChangeset {
return &resourceRecordChangeset{
client: r.client,
zone: r.zone,
rrsets: r,
additions: []dnsprovider.ResourceRecordSet{},
removals: []dnsprovider.ResourceRecordSet{},
upserts: []dnsprovider.ResourceRecordSet{},
}
}
// Zone returns the associated implementation of dnsprovider.Zone
func (r *resourceRecordSets) Zone() dnsprovider.Zone {
return r.zone
}
// recordRecordSet implements dnsprovider.ResourceRecordSet which represents
// a single record associated with a zone
type resourceRecordSet struct {
name string
data []string
ttl int
recordType rrstype.RrsType
}
// Name returns the name of a resource record set
func (r *resourceRecordSet) Name() string {
return r.name
}
// Rrdatas returns a list of data associated with a resource record set
// in DO this is almost always the IP of a record
func (r *resourceRecordSet) Rrdatas() []string {
return r.data
}
// Ttl returns the time-to-live of a record
func (r *resourceRecordSet) Ttl() int64 {
return int64(r.ttl)
}
// Type returns the type of record a resource record set is
func (r *resourceRecordSet) Type() rrstype.RrsType {
return r.recordType
}
// resourceRecordChangeset implements dnsprovider.ResourceRecordChangeset
type resourceRecordChangeset struct {
client *godo.Client
zone *zone
rrsets dnsprovider.ResourceRecordSets
additions []dnsprovider.ResourceRecordSet
removals []dnsprovider.ResourceRecordSet
upserts []dnsprovider.ResourceRecordSet
}
// Add adds a new resource record set to the list of additions to apply
func (r *resourceRecordChangeset) Add(rrset dnsprovider.ResourceRecordSet) dnsprovider.ResourceRecordChangeset {
r.additions = append(r.additions, rrset)
return r
}
// Remove adds a new resource record set to the list of removals to apply
func (r *resourceRecordChangeset) Remove(rrset dnsprovider.ResourceRecordSet) dnsprovider.ResourceRecordChangeset {
r.removals = append(r.removals, rrset)
return r
}
// Upsert adds a new resource record set to the list of upserts to apply
func (r *resourceRecordChangeset) Upsert(rrset dnsprovider.ResourceRecordSet) dnsprovider.ResourceRecordChangeset {
r.upserts = append(r.upserts, rrset)
return r
}
// Apply adds new records stored in r.additions, updates records stored
// in r.upserts and deletes records stored in r.removals
func (r *resourceRecordChangeset) Apply(ctx context.Context) error {
// Empty changesets should be a relatively quick no-op
if r.IsEmpty() {
klog.V(4).Info("record change set is empty")
return nil
}
klog.V(2).Info("applying changes in record change set")
if len(r.additions) > 0 {
for _, rrset := range r.additions {
err := r.applyResourceRecordSet(rrset)
if err != nil {
return fmt.Errorf("failed to apply resource record set: %s, err: %s", rrset.Name(), err)
}
}
klog.V(2).Info("record change set additions complete")
}
if len(r.upserts) > 0 {
for _, rrset := range r.upserts {
err := r.applyResourceRecordSet(rrset)
if err != nil {
return fmt.Errorf("failed to apply resource record set: %s, err: %s", rrset.Name(), err)
}
}
klog.V(2).Info("record change set upserts complete")
}
if len(r.removals) > 0 {
records, err := getRecords(r.client, r.zone.Name())
if err != nil {
return err
}
for _, record := range r.removals {
for _, domainRecord := range records {
if domainRecord.Name == record.Name() {
err := deleteRecord(r.client, r.zone.Name(), domainRecord.ID)
if err != nil {
return fmt.Errorf("failed to delete record: %v", err)
}
}
}
}
klog.V(2).Info("record change set removals complete")
}
klog.V(2).Info("record change sets successfully applied")
return nil
}
// IsEmpty returns true if a changeset is empty, false otherwise
func (r *resourceRecordChangeset) IsEmpty() bool {
if len(r.additions) == 0 && len(r.removals) == 0 && len(r.upserts) == 0 {
return true
}
return false
}
// ResourceRecordSet returns the associated resourceRecordSets of a changeset
func (r *resourceRecordChangeset) ResourceRecordSets() dnsprovider.ResourceRecordSets {
return r.rrsets
}
// applyResourceRecordSet will create records of a domain as required by resourceRecordChangeset
// and delete any previously created records matching the same name.
// This is required for digitalocean since it's API does not handle record sets, but
// only individual records
func (r *resourceRecordChangeset) applyResourceRecordSet(rrset dnsprovider.ResourceRecordSet) error {
deleteRecords, err := getRecordsByName(r.client, r.zone.Name(), rrset.Name())
if err != nil {
return fmt.Errorf("failed to get record IDs to delete")
}
for _, rrdata := range rrset.Rrdatas() {
recordCreateRequest := &godo.DomainRecordEditRequest{
Name: rrset.Name(),
Data: rrdata,
TTL: int(rrset.Ttl()),
Type: string(rrset.Type()),
}
err := createRecord(r.client, r.zone.Name(), recordCreateRequest)
if err != nil {
return fmt.Errorf("could not create record: %v", err)
}
}
for _, record := range deleteRecords {
err := deleteRecord(r.client, r.zone.Name(), record.ID)
if err != nil {
return fmt.Errorf("error cleaning up old records: %v", err)
}
}
return nil
}
// listDomains returns a list of godo.Domain
func listDomains(c *godo.Client) ([]godo.Domain, error) {
// TODO (andrewsykim): pagination in ListOptions
domains, _, err := c.Domains.List(context.TODO(), &godo.ListOptions{})
if err != nil {
return nil, fmt.Errorf("failed to list domains: %v", err)
}
return domains, err
}
// createDomain creates a domain provided godo.DomainCreateRequest
func createDomain(c *godo.Client, createRequest *godo.DomainCreateRequest) (*godo.Domain, error) {
domain, _, err := c.Domains.Create(context.TODO(), createRequest)
if err != nil {
return nil, err
}
return domain, nil
}
// deleteDomain deletes a domain given its name
func deleteDomain(c *godo.Client, name string) error {
_, err := c.Domains.Delete(context.TODO(), name)
if err != nil {
return err
}
return nil
}
// getRecords returns a list of godo.DomainRecord given a zone name
func getRecords(c *godo.Client, zoneName string) ([]godo.DomainRecord, error) {
allRecords := []godo.DomainRecord{}
opt := &godo.ListOptions{}
for {
records, resp, err := c.Domains.Records(context.TODO(), zoneName, opt)
if err != nil {
return nil, err
}
allRecords = append(allRecords, records...)
if resp.Links == nil || resp.Links.IsLastPage() {
break
}
page, err := resp.Links.CurrentPage()
if err != nil {
return nil, err
}
opt.Page = page + 1
}
return allRecords, nil
}
// getRecordsByName returns a list of godo.DomainRecord based on the provided zone and name
func getRecordsByName(client *godo.Client, zoneName, recordName string) ([]godo.DomainRecord, error) {
records, err := getRecords(client, zoneName)
if err != nil {
return nil, err
}
// digitalocean record.Name returns record without the zone suffix
// so normalize record by removing it
normalizedRecordName := strings.TrimSuffix(recordName, ".")
normalizedRecordName = strings.TrimSuffix(normalizedRecordName, "."+zoneName)
var recordsByName []godo.DomainRecord
for _, record := range records {
if record.Name == normalizedRecordName {
recordsByName = append(recordsByName, record)
}
}
return recordsByName, nil
}
// createRecord creates a record given an associated zone and a godo.DomainRecordEditRequest
func createRecord(c *godo.Client, zoneName string, createRequest *godo.DomainRecordEditRequest) error {
_, _, err := c.Domains.CreateRecord(context.TODO(), zoneName, createRequest)
if err != nil {
return fmt.Errorf("error creating record: %v", err)
}
return nil
}
// deleteRecord deletes a record given an associated zone and a record ID
func deleteRecord(c *godo.Client, zoneName string, recordID int) error {
_, err := c.Domains.DeleteRecord(context.TODO(), zoneName, recordID)
if err != nil {
return fmt.Errorf("error deleting record: %v", err)
}
return nil
}