feat: purge old files and snapshots

closes #4087
closes #2172

pkg/services/sqlstore/dashboard_snapshot.go

@@ -5,7 +5,9 @@ import (
 
 	"github.com/go-xorm/xorm"
 	"github.com/grafana/grafana/pkg/bus"
+	"github.com/grafana/grafana/pkg/log"
 	m "github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/setting"
 )
 
 func init() {
@@ -13,6 +15,31 @@ func init() {
 	bus.AddHandler("sql", GetDashboardSnapshot)
 	bus.AddHandler("sql", DeleteDashboardSnapshot)
 	bus.AddHandler("sql", SearchDashboardSnapshots)
+	bus.AddEventListener(DeleteExpiredSnapshots)
+}
+
+func DeleteExpiredSnapshots(cmd *m.HourCommand) error {
+	return inTransaction(func(sess *xorm.Session) error {
+		var expiredCount int64 = 0
+		var oldCount int64 = 0
+
+		if setting.SnapShotRemoveExpired {
+			deleteExpiredSql := "DELETE FROM dashboard_snapshot WHERE expires < ?"
+			expiredResponse, err := x.Exec(deleteExpiredSql, cmd.Time)
+			if err != nil {
+				return err
+			}
+			expiredCount, _ = expiredResponse.RowsAffected()
+		}
+
+		oldSnapshotsSql := "DELETE FROM dashboard_snapshot WHERE created < ?"
+		oldResponse, err := x.Exec(oldSnapshotsSql, cmd.Time.AddDate(0, 0, setting.SnapShotTTLDays*-1))
+		oldCount, _ = oldResponse.RowsAffected()
+
+		log.Debug2("Deleted old/expired snaphots", "to old", oldCount, "expired", expiredCount)
+
+		return err
+	})
 }
 
 func CreateDashboardSnapshot(cmd *m.CreateDashboardSnapshotCommand) error {