feat(alerting): add async state persister (#80763)

pkg/services/ngalert/store/instance_database.go

@@ -9,6 +9,7 @@ import (
 	"github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/ngalert/models"
+	"github.com/grafana/grafana/pkg/services/sqlstore"
 )
 
 // ListAlertInstances is a handler for retrieving alert instances within specific organisation
@@ -197,3 +198,36 @@ func (st DBstore) DeleteAlertInstancesByRule(ctx context.Context, key models.Ale
 		return err
 	})
 }
+
+func (st DBstore) FullSync(ctx context.Context, instances []models.AlertInstance) error {
+	if len(instances) == 0 {
+		return nil
+	}
+	return st.SQLStore.WithTransactionalDbSession(ctx, func(sess *sqlstore.DBSession) error {
+		// First we delete all records from the table
+		if _, err := sess.Exec("DELETE FROM alert_instance"); err != nil {
+			return fmt.Errorf("failed to delete alert_instance table: %w", err)
+		}
+		for _, alertInstance := range instances {
+			if err := models.ValidateAlertInstance(alertInstance); err != nil {
+				st.Logger.Warn("Failed to validate alert instance, skipping", "err", err, "rule_uid", alertInstance.RuleUID)
+				continue
+			}
+			labelTupleJSON, err := alertInstance.Labels.StringKey()
+			if err != nil {
+				st.Logger.Warn("Failed to generate alert instance labels key, skipping", "err", err, "rule_uid", alertInstance.RuleUID)
+				continue
+			}
+
+			_, err = sess.Exec("INSERT INTO alert_instance (rule_org_id, rule_uid, labels, labels_hash, current_state, current_reason, current_state_since, current_state_end, last_eval_time) VALUES (?,?,?,?,?,?,?,?,?)",
+				alertInstance.RuleOrgID, alertInstance.RuleUID, labelTupleJSON, alertInstance.LabelsHash, alertInstance.CurrentState, alertInstance.CurrentReason, alertInstance.CurrentStateSince.Unix(), alertInstance.CurrentStateEnd.Unix(), alertInstance.LastEvalTime.Unix())
+			if err != nil {
+				return fmt.Errorf("failed to insert into alert_instance table: %w", err)
+			}
+		}
+		if err := sess.Commit(); err != nil {
+			return fmt.Errorf("failed to commit alert_instance table: %w", err)
+		}
+		return nil
+	})
+}