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sqlite.go
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sqlite.go
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package sqlite
import (
"fmt"
"math/rand"
"os"
"time"
"github.com/golang-migrate/migrate/v4"
"github.com/golang-migrate/migrate/v4/database/sqlite3"
bindata "github.com/golang-migrate/migrate/v4/source/go_bindata"
"github.com/jmoiron/sqlx"
sql "github.com/mattn/go-sqlite3"
"github.com/openrport/openrport/share/logger"
)
const (
WALEnabled = "_journal_mode=WAL"
defaultDelayBetweenAttempts = 200 * time.Millisecond
DefaultMaxAttempts = 5
DefaultMaxOpenConnections = 1
)
type DataSourceOptions struct {
WALEnabled bool
MaxOpenConnections int
}
// New returns a new sqlite DB instance with migrated DB scheme to the latest version.
// assetNames and asset are used to migrate DB scheme.
func New(dataSourceName string, assetNames []string, asset func(name string) ([]byte, error), dataSourceOptions DataSourceOptions) (*sqlx.DB, error) {
dbPath := dataSourceName
if dataSourceOptions.WALEnabled {
dataSourceName += "?" + WALEnabled
}
db, err := sqlx.Connect("sqlite3", dataSourceName)
if err != nil {
return nil, fmt.Errorf("failed to connect to DB: %v", err)
}
if dbPath != ":memory:" {
if err = os.Chmod(dbPath, 0600); err != nil {
return nil, fmt.Errorf("failed to chmod %s: %s", dbPath, err)
}
}
maxConns := dataSourceOptions.MaxOpenConnections
if maxConns == 0 {
maxConns = DefaultMaxOpenConnections
}
db.SetMaxOpenConns(maxConns)
s := bindata.Resource(assetNames,
func(name string) ([]byte, error) {
return asset(name)
})
sourceDriver, err := bindata.WithInstance(s)
if err != nil {
return nil, fmt.Errorf("failed to init DB source driver: %v", err)
}
dbDriver, err := sqlite3.WithInstance(db.DB, &sqlite3.Config{})
if err != nil {
return nil, fmt.Errorf("failed to init DB migration driver: %v", err)
}
m, err := migrate.NewWithInstance("go-bindata", sourceDriver, "sqlite3", dbDriver)
if err != nil {
return nil, fmt.Errorf("failed to init DB migration instance: %v", err)
}
if err := m.Up(); err != nil && err != migrate.ErrNoChange {
return nil, fmt.Errorf("failed to migrate DB to the latest version: %v", err)
}
return db, nil
}
func WithRetryWhenBusy[R any](retryAbleFn func() (result R, err error), label string, l *logger.Logger) (result R, err error) {
for attempt := 1; attempt <= DefaultMaxAttempts; attempt++ {
if attempt > 1 && err != nil {
sqlErr, ok := err.(sql.Error)
if ok && sqlErr.Code == sql.ErrBusy {
l.Debugf("%s: attempt %d: source err = %+v\n", label, attempt, err)
jitter := time.Duration((rand.Intn(100))) * time.Millisecond
time.Sleep(defaultDelayBetweenAttempts + jitter)
} else {
// a different error from database busy, so fail immediately
l.Debugf("%s: attempt %d: non-retryable err = %+v\n", label, attempt, err)
return result, err
}
}
// make an attempt to complete the retryable fn
result, err = retryAbleFn()
// if no error then return immediately if with success result
if err == nil {
return result, nil
}
}
l.Errorf("%s: failed after max attempts: err = %+v\n", label, err)
return result, err
}