mirror of
https://github.com/grafana/grafana.git
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70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
package sqlstore
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import (
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"time"
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"github.com/go-xorm/xorm"
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"github.com/grafana/grafana/pkg/bus"
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"github.com/grafana/grafana/pkg/log"
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sqlite3 "github.com/mattn/go-sqlite3"
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)
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type DBSession struct {
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*xorm.Session
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events []interface{}
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}
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type dbTransactionFunc func(sess *DBSession) error
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func (sess *DBSession) publishAfterCommit(msg interface{}) {
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sess.events = append(sess.events, msg)
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}
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func newSession() *DBSession {
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return &DBSession{Session: x.NewSession()}
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}
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func inTransaction(callback dbTransactionFunc) error {
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return inTransactionWithRetry(callback, 0)
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}
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func inTransactionWithRetry(callback dbTransactionFunc, retry int) error {
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var err error
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sess := newSession()
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defer sess.Close()
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if err = sess.Begin(); err != nil {
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return err
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}
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err = callback(sess)
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// special handling of database locked errors for sqlite, then we can retry 3 times
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if sqlError, ok := err.(sqlite3.Error); ok && retry < 5 {
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if sqlError.Code == sqlite3.ErrLocked {
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sess.Rollback()
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time.Sleep(time.Millisecond * time.Duration(10))
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sqlog.Info("Database table locked, sleeping then retrying", "retry", retry)
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return inTransactionWithRetry(callback, retry+1)
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}
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}
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if err != nil {
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sess.Rollback()
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return err
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} else if err = sess.Commit(); err != nil {
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return err
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}
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if len(sess.events) > 0 {
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for _, e := range sess.events {
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if err = bus.Publish(e); err != nil {
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log.Error(3, "Failed to publish event after commit", err)
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}
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}
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}
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return nil
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}
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