/
sqlite.go
351 lines (293 loc) · 9.04 KB
/
sqlite.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
package sqlite
import (
"context"
"database/sql"
"fmt"
"os"
"strconv"
"strings"
"sync/atomic"
"github.com/pkg/errors"
"github.com/mattermost/morph/drivers"
"github.com/mattermost/morph/models"
_ "modernc.org/sqlite"
)
const driverName = "sqlite"
const defaultMigrationMaxSize = 10 * 1 << 20 // 10 MB
// add here any custom driver configuration
var configParams = []string{
"x-migration-max-size",
"x-migrations-table",
"x-statement-timeout",
}
type driverConfig struct {
drivers.Config
closeDBonClose bool
}
type sqlite struct {
conn *sql.Conn
db *sql.DB
config *driverConfig
lockedFlag int32 // indicates that the driver is locked or not
}
func WithInstance(dbInstance *sql.DB) (drivers.Driver, error) {
conn, err := dbInstance.Conn(context.Background())
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "grabbing_connection", OrigErr: err, Message: "failed to grab connection to the database"}
}
return &sqlite{config: getDefaultConfig(), conn: conn, db: dbInstance}, nil
}
func Open(filePath string) (drivers.Driver, error) {
customParams, err := drivers.ExtractCustomParams(filePath, configParams)
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to parse custom parameters from url"}
}
sanitizedConnURL, err := drivers.RemoveParamsFromURL(filePath, configParams)
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to sanitize url from custom parameters"}
}
sanitizedConnURL = strings.TrimSuffix(sanitizedConnURL, "?")
driverConfig, err := mergeConfigWithParams(customParams, getDefaultConfig())
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to merge custom params to driver config"}
}
if _, err := os.Stat(sanitizedConnURL); errors.Is(err, os.ErrNotExist) {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to open db file"}
}
db, err := sql.Open(driverName, sanitizedConnURL)
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "opening_connection", OrigErr: err, Message: "failed to open connection with the database"}
}
conn, err := db.Conn(context.Background())
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "grabbing_connection", OrigErr: err, Message: "failed to grab connection to the database"}
}
driverConfig.closeDBonClose = true
return &sqlite{
conn: conn,
db: db,
config: driverConfig,
}, nil
}
func (driver *sqlite) Ping() error {
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
return driver.conn.PingContext(ctx)
}
func (sqlite) DriverName() string {
return driverName
}
func (driver *sqlite) Close() error {
if driver.conn != nil {
if err := driver.conn.Close(); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to close database connection",
Command: "sqlite_conn_close",
Query: nil,
}
}
}
if driver.db != nil && driver.config.closeDBonClose {
if err := driver.db.Close(); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to close database",
Command: "sqlite_db_close",
Query: nil,
}
}
driver.db = nil
}
driver.conn = nil
return nil
}
func (driver *sqlite) lock() error {
if !atomic.CompareAndSwapInt32(&driver.lockedFlag, 0, 1) {
return &drivers.DatabaseError{
OrigErr: errors.New("already locked"),
Driver: driverName,
Message: "failed to obtain lock",
Command: "lock_driver",
}
}
return nil
}
func (driver *sqlite) unlock() error {
atomic.StoreInt32(&driver.lockedFlag, 0)
return nil
}
func (driver *sqlite) createSchemaTableIfNotExists() (err error) {
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
createTableIfNotExistsQuery := fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (Version bigint not null primary key, Name varchar not null)", driver.config.MigrationsTable)
if _, err = driver.conn.ExecContext(ctx, createTableIfNotExistsQuery); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed while executing query",
Command: "create_migrations_table_if_not_exists",
Query: []byte(createTableIfNotExistsQuery),
}
}
return nil
}
func (driver *sqlite) Apply(migration *models.Migration, saveVersion bool) (err error) {
if err = driver.lock(); err != nil {
return err
}
defer func() {
_ = driver.unlock()
}()
query := migration.Query()
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
transaction, err := driver.conn.BeginTx(ctx, nil)
if err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "error while opening a transaction to the database",
Command: "begin_transaction",
}
}
if err = execTransaction(transaction, query); err != nil {
return err
}
if saveVersion {
updateVersionQuery := driver.addMigrationQuery(migration)
if err = execTransaction(transaction, updateVersionQuery); err != nil {
return err
}
}
err = transaction.Commit()
if err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "error while committing a transaction to the database",
Command: "commit_transaction",
}
}
return nil
}
func (driver *sqlite) AppliedMigrations() (migrations []*models.Migration, err error) {
if driver.conn == nil {
return nil, &drivers.AppError{
OrigErr: errors.New("driver has no connection established"),
Message: "database connection is missing",
Driver: driverName,
}
}
if err = driver.lock(); err != nil {
return nil, err
}
defer func() {
_ = driver.unlock()
}()
if err := driver.createSchemaTableIfNotExists(); err != nil {
return nil, err
}
query := fmt.Sprintf("SELECT version, name FROM %s", driver.config.MigrationsTable)
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
var appliedMigrations []*models.Migration
var version uint32
var name string
rows, err := driver.conn.QueryContext(ctx, query)
if err != nil {
return nil, &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to fetch applied migrations",
Command: "select_applied_migrations",
Query: []byte(query),
}
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&version, &name); err != nil {
return nil, &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to scan applied migration row",
Command: "scan_applied_migrations",
}
}
appliedMigrations = append(appliedMigrations, &models.Migration{
Name: name,
Version: version,
Direction: models.Up,
})
}
return appliedMigrations, nil
}
func mergeConfigWithParams(params map[string]string, config *driverConfig) (*driverConfig, error) {
var err error
for _, configKey := range configParams {
if v, ok := params[configKey]; ok {
switch configKey {
case "x-migration-max-size":
if config.MigrationMaxSize, err = strconv.Atoi(v); err != nil {
return nil, errors.New(fmt.Sprintf("failed to cast config param %s of %s", configKey, v))
}
case "x-migrations-table":
config.MigrationsTable = v
case "x-statement-timeout":
if config.StatementTimeoutInSecs, err = strconv.Atoi(v); err != nil {
return nil, errors.New(fmt.Sprintf("failed to cast config param %s of %s", configKey, v))
}
}
}
}
return config, nil
}
func (driver *sqlite) addMigrationQuery(migration *models.Migration) string {
if migration.Direction == models.Down {
return fmt.Sprintf("DELETE FROM %s WHERE (Version=%d AND NAME='%s')", driver.config.MigrationsTable, migration.Version, migration.Name)
}
return fmt.Sprintf("INSERT INTO %s (Version, Name) VALUES (%d, '%s')", driver.config.MigrationsTable, migration.Version, migration.Name)
}
func (driver *sqlite) SetConfig(key string, value interface{}) error {
if driver.config != nil {
switch key {
case "StatementTimeoutInSecs":
n, ok := value.(int)
if ok {
driver.config.StatementTimeoutInSecs = n
return nil
}
return fmt.Errorf("incorrect value type for %s", key)
case "MigrationsTable":
n, ok := value.(string)
if ok {
driver.config.MigrationsTable = n
return nil
}
return fmt.Errorf("incorrect value type for %s", key)
}
}
return fmt.Errorf("incorrect key name %q", key)
}
func execTransaction(transaction *sql.Tx, query string) error {
if _, err := transaction.Exec(query); err != nil {
if txErr := transaction.Rollback(); txErr != nil {
err = errors.Wrap(errors.New(err.Error()+txErr.Error()), "failed to execute query in migration transaction")
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Command: "rollback_transaction",
}
}
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed when applying migration",
Command: "apply_migration",
Query: []byte(query),
}
}
return nil
}