forked from openshift/origin
-
Notifications
You must be signed in to change notification settings - Fork 0
/
structs.go
640 lines (571 loc) · 12.9 KB
/
structs.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
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
package zk
import (
"encoding/binary"
"errors"
"log"
"reflect"
"runtime"
"time"
)
var (
ErrUnhandledFieldType = errors.New("zk: unhandled field type")
ErrPtrExpected = errors.New("zk: encode/decode expect a non-nil pointer to struct")
ErrShortBuffer = errors.New("zk: buffer too small")
)
type defaultLogger struct{}
func (defaultLogger) Printf(format string, a ...interface{}) {
log.Printf(format, a...)
}
type ACL struct {
Perms int32
Scheme string
ID string
}
type Stat struct {
Czxid int64 // The zxid of the change that caused this znode to be created.
Mzxid int64 // The zxid of the change that last modified this znode.
Ctime int64 // The time in milliseconds from epoch when this znode was created.
Mtime int64 // The time in milliseconds from epoch when this znode was last modified.
Version int32 // The number of changes to the data of this znode.
Cversion int32 // The number of changes to the children of this znode.
Aversion int32 // The number of changes to the ACL of this znode.
EphemeralOwner int64 // The session id of the owner of this znode if the znode is an ephemeral node. If it is not an ephemeral node, it will be zero.
DataLength int32 // The length of the data field of this znode.
NumChildren int32 // The number of children of this znode.
Pzxid int64 // last modified children
}
// ServerClient is the information for a single Zookeeper client and its session.
// This is used to parse/extract the output fo the `cons` command.
type ServerClient struct {
Queued int64
Received int64
Sent int64
SessionID int64
Lcxid int64
Lzxid int64
Timeout int32
LastLatency int32
MinLatency int32
AvgLatency int32
MaxLatency int32
Established time.Time
LastResponse time.Time
Addr string
LastOperation string // maybe?
Error error
}
// ServerClients is a struct for the FLWCons() function. It's used to provide
// the list of Clients.
//
// This is needed because FLWCons() takes multiple servers.
type ServerClients struct {
Clients []*ServerClient
Error error
}
// ServerStats is the information pulled from the Zookeeper `stat` command.
type ServerStats struct {
Sent int64
Received int64
NodeCount int64
MinLatency int64
AvgLatency int64
MaxLatency int64
Connections int64
Outstanding int64
Epoch int32
Counter int32
BuildTime time.Time
Mode Mode
Version string
Error error
}
type requestHeader struct {
Xid int32
Opcode int32
}
type responseHeader struct {
Xid int32
Zxid int64
Err ErrCode
}
type multiHeader struct {
Type int32
Done bool
Err ErrCode
}
type auth struct {
Type int32
Scheme string
Auth []byte
}
// Generic request structs
type pathRequest struct {
Path string
}
type PathVersionRequest struct {
Path string
Version int32
}
type pathWatchRequest struct {
Path string
Watch bool
}
type pathResponse struct {
Path string
}
type statResponse struct {
Stat Stat
}
//
type CheckVersionRequest PathVersionRequest
type closeRequest struct{}
type closeResponse struct{}
type connectRequest struct {
ProtocolVersion int32
LastZxidSeen int64
TimeOut int32
SessionID int64
Passwd []byte
}
type connectResponse struct {
ProtocolVersion int32
TimeOut int32
SessionID int64
Passwd []byte
}
type CreateRequest struct {
Path string
Data []byte
Acl []ACL
Flags int32
}
type createResponse pathResponse
type DeleteRequest PathVersionRequest
type deleteResponse struct{}
type errorResponse struct {
Err int32
}
type existsRequest pathWatchRequest
type existsResponse statResponse
type getAclRequest pathRequest
type getAclResponse struct {
Acl []ACL
Stat Stat
}
type getChildrenRequest pathRequest
type getChildrenResponse struct {
Children []string
}
type getChildren2Request pathWatchRequest
type getChildren2Response struct {
Children []string
Stat Stat
}
type getDataRequest pathWatchRequest
type getDataResponse struct {
Data []byte
Stat Stat
}
type getMaxChildrenRequest pathRequest
type getMaxChildrenResponse struct {
Max int32
}
type getSaslRequest struct {
Token []byte
}
type pingRequest struct{}
type pingResponse struct{}
type setAclRequest struct {
Path string
Acl []ACL
Version int32
}
type setAclResponse statResponse
type SetDataRequest struct {
Path string
Data []byte
Version int32
}
type setDataResponse statResponse
type setMaxChildren struct {
Path string
Max int32
}
type setSaslRequest struct {
Token string
}
type setSaslResponse struct {
Token string
}
type setWatchesRequest struct {
RelativeZxid int64
DataWatches []string
ExistWatches []string
ChildWatches []string
}
type setWatchesResponse struct{}
type syncRequest pathRequest
type syncResponse pathResponse
type setAuthRequest auth
type setAuthResponse struct{}
type multiRequestOp struct {
Header multiHeader
Op interface{}
}
type multiRequest struct {
Ops []multiRequestOp
DoneHeader multiHeader
}
type multiResponseOp struct {
Header multiHeader
String string
Stat *Stat
}
type multiResponse struct {
Ops []multiResponseOp
DoneHeader multiHeader
}
func (r *multiRequest) Encode(buf []byte) (int, error) {
total := 0
for _, op := range r.Ops {
op.Header.Done = false
n, err := encodePacketValue(buf[total:], reflect.ValueOf(op))
if err != nil {
return total, err
}
total += n
}
r.DoneHeader.Done = true
n, err := encodePacketValue(buf[total:], reflect.ValueOf(r.DoneHeader))
if err != nil {
return total, err
}
total += n
return total, nil
}
func (r *multiRequest) Decode(buf []byte) (int, error) {
r.Ops = make([]multiRequestOp, 0)
r.DoneHeader = multiHeader{-1, true, -1}
total := 0
for {
header := &multiHeader{}
n, err := decodePacketValue(buf[total:], reflect.ValueOf(header))
if err != nil {
return total, err
}
total += n
if header.Done {
r.DoneHeader = *header
break
}
req := requestStructForOp(header.Type)
if req == nil {
return total, ErrAPIError
}
n, err = decodePacketValue(buf[total:], reflect.ValueOf(req))
if err != nil {
return total, err
}
total += n
r.Ops = append(r.Ops, multiRequestOp{*header, req})
}
return total, nil
}
func (r *multiResponse) Decode(buf []byte) (int, error) {
r.Ops = make([]multiResponseOp, 0)
r.DoneHeader = multiHeader{-1, true, -1}
total := 0
for {
header := &multiHeader{}
n, err := decodePacketValue(buf[total:], reflect.ValueOf(header))
if err != nil {
return total, err
}
total += n
if header.Done {
r.DoneHeader = *header
break
}
res := multiResponseOp{Header: *header}
var w reflect.Value
switch header.Type {
default:
return total, ErrAPIError
case opCreate:
w = reflect.ValueOf(&res.String)
case opSetData:
res.Stat = new(Stat)
w = reflect.ValueOf(res.Stat)
case opCheck, opDelete:
}
if w.IsValid() {
n, err := decodePacketValue(buf[total:], w)
if err != nil {
return total, err
}
total += n
}
r.Ops = append(r.Ops, res)
}
return total, nil
}
type watcherEvent struct {
Type EventType
State State
Path string
}
type decoder interface {
Decode(buf []byte) (int, error)
}
type encoder interface {
Encode(buf []byte) (int, error)
}
func decodePacket(buf []byte, st interface{}) (n int, err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok && e.Error() == "runtime error: slice bounds out of range" {
err = ErrShortBuffer
} else {
panic(r)
}
}
}()
v := reflect.ValueOf(st)
if v.Kind() != reflect.Ptr || v.IsNil() {
return 0, ErrPtrExpected
}
return decodePacketValue(buf, v)
}
func decodePacketValue(buf []byte, v reflect.Value) (int, error) {
rv := v
kind := v.Kind()
if kind == reflect.Ptr {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
v = v.Elem()
kind = v.Kind()
}
n := 0
switch kind {
default:
return n, ErrUnhandledFieldType
case reflect.Struct:
if de, ok := rv.Interface().(decoder); ok {
return de.Decode(buf)
} else if de, ok := v.Interface().(decoder); ok {
return de.Decode(buf)
} else {
for i := 0; i < v.NumField(); i++ {
field := v.Field(i)
n2, err := decodePacketValue(buf[n:], field)
n += n2
if err != nil {
return n, err
}
}
}
case reflect.Bool:
v.SetBool(buf[n] != 0)
n++
case reflect.Int32:
v.SetInt(int64(binary.BigEndian.Uint32(buf[n : n+4])))
n += 4
case reflect.Int64:
v.SetInt(int64(binary.BigEndian.Uint64(buf[n : n+8])))
n += 8
case reflect.String:
ln := int(binary.BigEndian.Uint32(buf[n : n+4]))
v.SetString(string(buf[n+4 : n+4+ln]))
n += 4 + ln
case reflect.Slice:
switch v.Type().Elem().Kind() {
default:
count := int(binary.BigEndian.Uint32(buf[n : n+4]))
n += 4
values := reflect.MakeSlice(v.Type(), count, count)
v.Set(values)
for i := 0; i < count; i++ {
n2, err := decodePacketValue(buf[n:], values.Index(i))
n += n2
if err != nil {
return n, err
}
}
case reflect.Uint8:
ln := int(int32(binary.BigEndian.Uint32(buf[n : n+4])))
if ln < 0 {
n += 4
v.SetBytes(nil)
} else {
bytes := make([]byte, ln)
copy(bytes, buf[n+4:n+4+ln])
v.SetBytes(bytes)
n += 4 + ln
}
}
}
return n, nil
}
func encodePacket(buf []byte, st interface{}) (n int, err error) {
defer func() {
if r := recover(); r != nil {
if e, ok := r.(runtime.Error); ok && e.Error() == "runtime error: slice bounds out of range" {
err = ErrShortBuffer
} else {
panic(r)
}
}
}()
v := reflect.ValueOf(st)
if v.Kind() != reflect.Ptr || v.IsNil() {
return 0, ErrPtrExpected
}
return encodePacketValue(buf, v)
}
func encodePacketValue(buf []byte, v reflect.Value) (int, error) {
rv := v
for v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface {
v = v.Elem()
}
n := 0
switch v.Kind() {
default:
return n, ErrUnhandledFieldType
case reflect.Struct:
if en, ok := rv.Interface().(encoder); ok {
return en.Encode(buf)
} else if en, ok := v.Interface().(encoder); ok {
return en.Encode(buf)
} else {
for i := 0; i < v.NumField(); i++ {
field := v.Field(i)
n2, err := encodePacketValue(buf[n:], field)
n += n2
if err != nil {
return n, err
}
}
}
case reflect.Bool:
if v.Bool() {
buf[n] = 1
} else {
buf[n] = 0
}
n++
case reflect.Int32:
binary.BigEndian.PutUint32(buf[n:n+4], uint32(v.Int()))
n += 4
case reflect.Int64:
binary.BigEndian.PutUint64(buf[n:n+8], uint64(v.Int()))
n += 8
case reflect.String:
str := v.String()
binary.BigEndian.PutUint32(buf[n:n+4], uint32(len(str)))
copy(buf[n+4:n+4+len(str)], []byte(str))
n += 4 + len(str)
case reflect.Slice:
switch v.Type().Elem().Kind() {
default:
count := v.Len()
startN := n
n += 4
for i := 0; i < count; i++ {
n2, err := encodePacketValue(buf[n:], v.Index(i))
n += n2
if err != nil {
return n, err
}
}
binary.BigEndian.PutUint32(buf[startN:startN+4], uint32(count))
case reflect.Uint8:
if v.IsNil() {
binary.BigEndian.PutUint32(buf[n:n+4], uint32(0xffffffff))
n += 4
} else {
bytes := v.Bytes()
binary.BigEndian.PutUint32(buf[n:n+4], uint32(len(bytes)))
copy(buf[n+4:n+4+len(bytes)], bytes)
n += 4 + len(bytes)
}
}
}
return n, nil
}
func requestStructForOp(op int32) interface{} {
switch op {
case opClose:
return &closeRequest{}
case opCreate:
return &CreateRequest{}
case opDelete:
return &DeleteRequest{}
case opExists:
return &existsRequest{}
case opGetAcl:
return &getAclRequest{}
case opGetChildren:
return &getChildrenRequest{}
case opGetChildren2:
return &getChildren2Request{}
case opGetData:
return &getDataRequest{}
case opPing:
return &pingRequest{}
case opSetAcl:
return &setAclRequest{}
case opSetData:
return &SetDataRequest{}
case opSetWatches:
return &setWatchesRequest{}
case opSync:
return &syncRequest{}
case opSetAuth:
return &setAuthRequest{}
case opCheck:
return &CheckVersionRequest{}
case opMulti:
return &multiRequest{}
}
return nil
}
func responseStructForOp(op int32) interface{} {
switch op {
case opClose:
return &closeResponse{}
case opCreate:
return &createResponse{}
case opDelete:
return &deleteResponse{}
case opExists:
return &existsResponse{}
case opGetAcl:
return &getAclResponse{}
case opGetChildren:
return &getChildrenResponse{}
case opGetChildren2:
return &getChildren2Response{}
case opGetData:
return &getDataResponse{}
case opPing:
return &pingResponse{}
case opSetAcl:
return &setAclResponse{}
case opSetData:
return &setDataResponse{}
case opSetWatches:
return &setWatchesResponse{}
case opSync:
return &syncResponse{}
case opWatcherEvent:
return &watcherEvent{}
case opSetAuth:
return &setAuthResponse{}
// case opCheck:
// return &checkVersionResponse{}
case opMulti:
return &multiResponse{}
}
return nil
}