This repository has been archived by the owner on Nov 24, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 190
/
db.go
579 lines (513 loc) · 17.8 KB
/
db.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
// Copyright 2019 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"context"
"database/sql"
"fmt"
"math"
"math/rand"
"strconv"
"strings"
"time"
"github.com/coreos/go-semver/semver"
gmysql "github.com/go-mysql-org/go-mysql/mysql"
"github.com/go-sql-driver/mysql"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/parser"
tmysql "github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb-tools/pkg/check"
"github.com/pingcap/tidb-tools/pkg/dbutil"
"go.uber.org/zap"
"github.com/pingcap/dm/pkg/gtid"
"github.com/pingcap/dm/pkg/log"
"github.com/pingcap/dm/pkg/terror"
)
const (
// DefaultDBTimeout represents a DB operation timeout for common usages.
DefaultDBTimeout = 30 * time.Second
// for MariaDB, UUID set as `gtid_domain_id` + domainServerIDSeparator + `server_id`.
domainServerIDSeparator = "-"
// the default base(min) server id generated by random.
defaultBaseServerID = math.MaxUint32 / 10
)
// GetFlavor gets flavor from DB.
func GetFlavor(ctx context.Context, db *sql.DB) (string, error) {
value, err := dbutil.ShowVersion(ctx, db)
if err != nil {
return "", terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
if check.IsMariaDB(value) {
return gmysql.MariaDBFlavor, nil
}
return gmysql.MySQLFlavor, nil
}
// GetAllServerID gets all slave server id and master server id.
func GetAllServerID(ctx context.Context, db *sql.DB) (map[uint32]struct{}, error) {
serverIDs, err := GetSlaveServerID(ctx, db)
if err != nil {
return nil, err
}
masterServerID, err := GetServerID(ctx, db)
if err != nil {
return nil, err
}
serverIDs[masterServerID] = struct{}{}
return serverIDs, nil
}
// GetRandomServerID gets a random server ID which is not used.
func GetRandomServerID(ctx context.Context, db *sql.DB) (uint32, error) {
rand.Seed(time.Now().UnixNano())
serverIDs, err := GetAllServerID(ctx, db)
if err != nil {
return 0, err
}
for i := 0; i < 99999; i++ {
randomValue := uint32(rand.Intn(100000))
randomServerID := uint32(defaultBaseServerID) + randomValue
if _, ok := serverIDs[randomServerID]; ok {
continue
}
return randomServerID, nil
}
// should never happened unless the master has too many slave.
return 0, terror.ErrInvalidServerID.Generatef("can't find a random available server ID")
}
// GetSlaveServerID gets all slave server id.
func GetSlaveServerID(ctx context.Context, db *sql.DB) (map[uint32]struct{}, error) {
rows, err := db.QueryContext(ctx, `SHOW SLAVE HOSTS`)
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
defer rows.Close()
rowColumns, err := rows.Columns()
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
/*
in MySQL:
mysql> SHOW SLAVE HOSTS;
+------------+-----------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID |
+------------+-----------+------+-----------+--------------------------------------+
| 192168010 | iconnect2 | 3306 | 192168011 | 14cb6624-7f93-11e0-b2c0-c80aa9429562 |
| 1921680101 | athena | 3306 | 192168011 | 07af4990-f41f-11df-a566-7ac56fdaf645 |
+------------+-----------+------+-----------+--------------------------------------+
in MariaDB:
mysql> SHOW SLAVE HOSTS;
+------------+-----------+------+-----------+
| Server_id | Host | Port | Master_id |
+------------+-----------+------+-----------+
| 192168010 | iconnect2 | 3306 | 192168011 |
| 1921680101 | athena | 3306 | 192168011 |
+------------+-----------+------+-----------+
*/
var (
serverID sql.NullInt64
host sql.NullString
port sql.NullInt64
masterID sql.NullInt64
slaveUUID sql.NullString
)
serverIDs := make(map[uint32]struct{})
for rows.Next() {
if len(rowColumns) == 5 {
err = rows.Scan(&serverID, &host, &port, &masterID, &slaveUUID)
} else {
err = rows.Scan(&serverID, &host, &port, &masterID)
}
if err != nil {
return nil, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
if serverID.Valid {
serverIDs[uint32(serverID.Int64)] = struct{}{}
} else {
// should never happened
log.L().Warn("get invalid server_id when execute `SHOW SLAVE HOSTS;`")
continue
}
}
if rows.Err() != nil {
return nil, terror.DBErrorAdapt(rows.Err(), terror.ErrDBDriverError)
}
return serverIDs, nil
}
// GetMasterStatus gets status from master.
// When the returned error is nil, the gtid.Set must be not nil.
func GetMasterStatus(ctx context.Context, db *sql.DB, flavor string) (gmysql.Position, gtid.Set, error) {
var (
binlogPos gmysql.Position
gs gtid.Set
)
rows, err := db.QueryContext(ctx, `SHOW MASTER STATUS`)
if err != nil {
return binlogPos, gs, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
defer rows.Close()
rowColumns, err := rows.Columns()
if err != nil {
return binlogPos, gs, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
// Show an example.
/*
MySQL [test]> SHOW MASTER STATUS;
+-----------+----------+--------------+------------------+--------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-----------+----------+--------------+------------------+--------------------------------------------+
| ON.000001 | 4822 | | | 85ab69d1-b21f-11e6-9c5e-64006a8978d2:1-46
+-----------+----------+--------------+------------------+--------------------------------------------+
*/
/*
For MariaDB,SHOW MASTER STATUS:
+--------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------+----------+--------------+------------------+
| mariadb-bin.000016 | 475 | | |
+--------------------+----------+--------------+------------------+
SELECT @@global.gtid_binlog_pos;
+--------------------------+
| @@global.gtid_binlog_pos |
+--------------------------+
| 0-1-2 |
+--------------------------+
*/
var (
gtidStr string
binlogName string
pos uint32
nullPtr interface{}
)
if !rows.Next() {
return binlogPos, gs, terror.ErrNoMasterStatus.Generate()
}
if len(rowColumns) == 5 {
err = rows.Scan(&binlogName, &pos, &nullPtr, &nullPtr, >idStr)
} else {
err = rows.Scan(&binlogName, &pos, &nullPtr, &nullPtr)
}
if err != nil {
return binlogPos, gs, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
binlogPos = gmysql.Position{
Name: binlogName,
Pos: pos,
}
gs, err = gtid.ParserGTID(flavor, gtidStr)
if err != nil {
return binlogPos, gs, err
}
if rows.Next() {
log.L().Warn("SHOW MASTER STATUS returns more than one row, will only use first row")
}
if rows.Close() != nil {
return binlogPos, gs, terror.DBErrorAdapt(rows.Err(), terror.ErrDBDriverError)
}
if rows.Err() != nil {
return binlogPos, gs, terror.DBErrorAdapt(rows.Err(), terror.ErrDBDriverError)
}
if flavor != gmysql.MySQLFlavor && (gs == nil || gs.String() == "") {
gs, err = GetMariaDBGTID(ctx, db)
if err != nil {
return binlogPos, gs, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
}
return binlogPos, gs, nil
}
// GetMariaDBGTID gets MariaDB's `gtid_binlog_pos`
// it can not get by `SHOW MASTER STATUS`.
func GetMariaDBGTID(ctx context.Context, db *sql.DB) (gtid.Set, error) {
gtidStr, err := GetGlobalVariable(ctx, db, "gtid_binlog_pos")
if err != nil {
return nil, err
}
gs, err := gtid.ParserGTID(gmysql.MariaDBFlavor, gtidStr)
if err != nil {
return nil, err
}
return gs, nil
}
// GetGlobalVariable gets server's global variable.
func GetGlobalVariable(ctx context.Context, db *sql.DB, variable string) (value string, err error) {
failpoint.Inject("GetGlobalVariableFailed", func(val failpoint.Value) {
items := strings.Split(val.(string), ",")
if len(items) != 2 {
log.L().Fatal("failpoint GetGlobalVariableFailed's value is invalid", zap.String("val", val.(string)))
}
variableName := items[0]
errCode, err1 := strconv.ParseUint(items[1], 10, 16)
if err1 != nil {
log.L().Fatal("failpoint GetGlobalVariableFailed's value is invalid", zap.String("val", val.(string)))
}
if variable == variableName {
err = tmysql.NewErr(uint16(errCode))
log.L().Warn("GetGlobalVariable failed", zap.String("variable", variable), zap.String("failpoint", "GetGlobalVariableFailed"), zap.Error(err))
failpoint.Return("", terror.DBErrorAdapt(err, terror.ErrDBDriverError))
}
})
conn, err := db.Conn(ctx)
if err != nil {
return "", terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
defer conn.Close()
return getVariable(ctx, conn, variable, true)
}
// GetSessionVariable gets connection's session variable.
func GetSessionVariable(ctx context.Context, conn *sql.Conn, variable string) (value string, err error) {
failpoint.Inject("GetSessionVariableFailed", func(val failpoint.Value) {
items := strings.Split(val.(string), ",")
if len(items) != 2 {
log.L().Fatal("failpoint GetSessionVariableFailed's value is invalid", zap.String("val", val.(string)))
}
variableName := items[0]
errCode, err1 := strconv.ParseUint(items[1], 10, 16)
if err1 != nil {
log.L().Fatal("failpoint GetSessionVariableFailed's value is invalid", zap.String("val", val.(string)))
}
if variable == variableName {
err = tmysql.NewErr(uint16(errCode))
log.L().Warn("GetSessionVariable failed", zap.String("variable", variable), zap.String("failpoint", "GetSessionVariableFailed"), zap.Error(err))
failpoint.Return("", terror.DBErrorAdapt(err, terror.ErrDBDriverError))
}
})
return getVariable(ctx, conn, variable, false)
}
func getVariable(ctx context.Context, conn *sql.Conn, variable string, isGlobal bool) (value string, err error) {
var template string
if isGlobal {
template = "SHOW GLOBAL VARIABLES LIKE '%s'"
} else {
template = "SHOW VARIABLES LIKE '%s'"
}
query := fmt.Sprintf(template, variable)
row := conn.QueryRowContext(ctx, query)
// Show an example.
/*
mysql> SHOW GLOBAL VARIABLES LIKE "binlog_format";
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW |
+---------------+-------+
*/
err = row.Scan(&variable, &value)
if err != nil {
return "", terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
return value, nil
}
// GetServerID gets server's `server_id`.
func GetServerID(ctx context.Context, db *sql.DB) (uint32, error) {
serverIDStr, err := GetGlobalVariable(ctx, db, "server_id")
if err != nil {
return 0, err
}
serverID, err := strconv.ParseUint(serverIDStr, 10, 32)
return uint32(serverID), terror.ErrInvalidServerID.Delegate(err, serverIDStr)
}
// GetMariaDBGtidDomainID gets MariaDB server's `gtid_domain_id`.
func GetMariaDBGtidDomainID(ctx context.Context, db *sql.DB) (uint32, error) {
domainIDStr, err := GetGlobalVariable(ctx, db, "gtid_domain_id")
if err != nil {
return 0, err
}
domainID, err := strconv.ParseUint(domainIDStr, 10, 32)
return uint32(domainID), terror.ErrMariaDBDomainID.Delegate(err, domainIDStr)
}
// GetServerUUID gets server's `server_uuid`.
func GetServerUUID(ctx context.Context, db *sql.DB, flavor string) (string, error) {
if flavor == gmysql.MariaDBFlavor {
return GetMariaDBUUID(ctx, db)
}
serverUUID, err := GetGlobalVariable(ctx, db, "server_uuid")
return serverUUID, err
}
// GetServerUnixTS gets server's `UNIX_TIMESTAMP()`.
func GetServerUnixTS(ctx context.Context, db *sql.DB) (int64, error) {
var ts int64
row := db.QueryRowContext(ctx, "SELECT UNIX_TIMESTAMP()")
err := row.Scan(&ts)
if err != nil {
log.L().Error("can't SELECT UNIX_TIMESTAMP()", zap.Error(err))
return ts, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
return ts, err
}
// GetMariaDBUUID gets equivalent `server_uuid` for MariaDB
// `gtid_domain_id` joined `server_id` with domainServerIDSeparator.
func GetMariaDBUUID(ctx context.Context, db *sql.DB) (string, error) {
domainID, err := GetMariaDBGtidDomainID(ctx, db)
if err != nil {
return "", err
}
serverID, err := GetServerID(ctx, db)
if err != nil {
return "", err
}
return fmt.Sprintf("%d%s%d", domainID, domainServerIDSeparator, serverID), nil
}
// GetParser gets a parser for sql.DB which is suitable for session variable sql_mode.
func GetParser(ctx context.Context, db *sql.DB) (*parser.Parser, error) {
c, err := db.Conn(ctx)
if err != nil {
return nil, err
}
defer c.Close()
return GetParserForConn(ctx, c)
}
// GetParserForConn gets a parser for sql.Conn which is suitable for session variable sql_mode.
func GetParserForConn(ctx context.Context, conn *sql.Conn) (*parser.Parser, error) {
sqlMode, err := GetSessionVariable(ctx, conn, "sql_mode")
if err != nil {
return nil, err
}
return GetParserFromSQLModeStr(sqlMode)
}
// GetParserFromSQLModeStr gets a parser and applies given sqlMode.
func GetParserFromSQLModeStr(sqlMode string) (*parser.Parser, error) {
mode, err := tmysql.GetSQLMode(sqlMode)
if err != nil {
return nil, err
}
parser2 := parser.New()
parser2.SetSQLMode(mode)
return parser2, nil
}
// KillConn kills the DB connection (thread in mysqld).
func KillConn(ctx context.Context, db *sql.DB, connID uint32) error {
_, err := db.ExecContext(ctx, fmt.Sprintf("KILL %d", connID))
return terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
// IsMySQLError checks whether err is MySQLError error.
func IsMySQLError(err error, code uint16) bool {
err = errors.Cause(err)
e, ok := err.(*mysql.MySQLError)
return ok && e.Number == code
}
// IsErrBinlogPurged checks whether err is BinlogPurged error.
func IsErrBinlogPurged(err error) bool {
return IsMySQLError(err, tmysql.ErrMasterFatalErrorReadingBinlog)
}
// IsNoSuchThreadError checks whether err is NoSuchThreadError.
func IsNoSuchThreadError(err error) bool {
return IsMySQLError(err, tmysql.ErrNoSuchThread)
}
// GetGTIDMode return GTID_MODE.
func GetGTIDMode(ctx context.Context, db *sql.DB) (string, error) {
val, err := GetGlobalVariable(ctx, db, "GTID_MODE")
return val, err
}
// ExtractTiDBVersion extract tidb's version
// version format: "5.7.25-TiDB-v3.0.0-beta-211-g09beefbe0-dirty"
// ^~~~~~~~~^
func ExtractTiDBVersion(version string) (*semver.Version, error) {
versions := strings.Split(strings.TrimSuffix(version, "-dirty"), "-")
end := len(versions)
switch end {
case 3, 4:
case 5, 6:
end -= 2
default:
return nil, errors.Errorf("not a valid TiDB version: %s", version)
}
rawVersion := strings.Join(versions[2:end], "-")
rawVersion = strings.TrimPrefix(rawVersion, "v")
return semver.NewVersion(rawVersion)
}
// AddGSetWithPurged is used to handle this case: https://github.com/pingcap/dm/issues/1418
// we might get a gtid set from Previous_gtids event in binlog, but that gtid set can't be used to start a gtid sync
// because it doesn't cover all gtid_purged. The error of using it will be
// ERROR 1236 (HY000): The slave is connecting using CHANGE MASTER TO MASTER_AUTO_POSITION = 1, but the master has purged binary logs containing GTIDs that the slave requires.
// so we add gtid_purged to it.
func AddGSetWithPurged(ctx context.Context, gset gtid.Set, conn *sql.Conn) (gtid.Set, error) {
if _, ok := gset.(*gtid.MariadbGTIDSet); ok {
return gset, nil
}
var (
gtidStr string
row *sql.Row
err error
)
failpoint.Inject("GetGTIDPurged", func(val failpoint.Value) {
str := val.(string)
gtidStr = str
failpoint.Goto("bypass")
})
row = conn.QueryRowContext(ctx, "select @@GLOBAL.gtid_purged")
err = row.Scan(>idStr)
if err != nil {
log.L().Error("can't get @@GLOBAL.gtid_purged when try to add it to gtid set", zap.Error(err))
return gset, terror.DBErrorAdapt(err, terror.ErrDBDriverError)
}
failpoint.Label("bypass")
if gtidStr == "" {
return gset, nil
}
newGset := gset.Origin()
err = newGset.Update(gtidStr)
if err != nil {
return nil, err
}
ret := >id.MySQLGTIDSet{}
_ = ret.Set(newGset)
return ret, nil
}
// AdjustSQLModeCompatible adjust downstream sql mode to compatible.
// TODO: When upstream's datatime is 2020-00-00, 2020-00-01, 2020-06-00
// and so on, downstream will be 2019-11-30, 2019-12-01, 2020-05-31,
// as if set the 'NO_ZERO_IN_DATE', 'NO_ZERO_DATE'.
// This is because the implementation of go-mysql, that you can see
// https://github.com/go-mysql-org/go-mysql/blob/master/replication/row_event.go#L1063-L1087
func AdjustSQLModeCompatible(sqlModes string) (string, error) {
needDisable := []string{
"NO_ZERO_IN_DATE",
"NO_ZERO_DATE",
"ERROR_FOR_DIVISION_BY_ZERO",
"NO_AUTO_CREATE_USER",
"STRICT_TRANS_TABLES",
"STRICT_ALL_TABLES",
}
needEnable := []string{
"IGNORE_SPACE",
"NO_AUTO_VALUE_ON_ZERO",
"ALLOW_INVALID_DATES",
}
disable := strings.Join(needDisable, ",")
enable := strings.Join(needEnable, ",")
mode, err := tmysql.GetSQLMode(sqlModes)
if err != nil {
return sqlModes, err
}
disableMode, err2 := tmysql.GetSQLMode(disable)
if err2 != nil {
return sqlModes, err2
}
enableMode, err3 := tmysql.GetSQLMode(enable)
if err3 != nil {
return sqlModes, err3
}
// About this bit manipulation, details can be seen
// https://github.com/pingcap/dm/pull/1869#discussion_r669771966
mode = (mode &^ disableMode) | enableMode
return GetSQLModeStrBySQLMode(mode), nil
}
// GetSQLModeStrBySQLMode get string represent of sql_mode by sql_mode.
func GetSQLModeStrBySQLMode(sqlMode tmysql.SQLMode) string {
var sqlModeStr []string
for str, SQLMode := range tmysql.Str2SQLMode {
if sqlMode&SQLMode != 0 {
sqlModeStr = append(sqlModeStr, str)
}
}
return strings.Join(sqlModeStr, ",")
}