*: Support more role labels.

mysqlcluster/syncer/follower_service.go

@@ -48,7 +48,7 @@ func NewFollowerSVCSyncer(cli client.Client, c *mysqlcluster.MysqlCluster) synce
 			service.Spec.Type = "ClusterIP"
 		}
 		service.Spec.Selector = c.GetSelectorLabels()
-		service.Spec.Selector["role"] = "follower"
+		service.Spec.Selector["role"] = string(utils.Follower)
 		service.Spec.Selector["healthy"] = "yes"
 
 		if len(service.Spec.Ports) != 2 {

mysqlcluster/syncer/leader_service.go

@@ -48,7 +48,7 @@ func NewLeaderSVCSyncer(cli client.Client, c *mysqlcluster.MysqlCluster) syncer.
 			service.Spec.Type = "ClusterIP"
 		}
 		service.Spec.Selector = c.GetSelectorLabels()
-		service.Spec.Selector["role"] = "leader"
+		service.Spec.Selector["role"] = string(utils.Leader)
 
 		if len(service.Spec.Ports) != 2 {
 			service.Spec.Ports = make([]corev1.ServicePort, 2)

mysqlcluster/syncer/statefulset.go

@@ -332,9 +332,12 @@ func (s *StatefulSetSyncer) updatePod(ctx context.Context) error {
 			return err
 		}
 	}
-	// Update the leader.
-	if err := s.applyNWait(ctx, &leaderPod); err != nil {
-		return err
+	// There may be a case where Leader does not exist during the update process.
+	if leaderPod.Name != "" {
+		// Update the leader.
+		if err := s.applyNWait(ctx, &leaderPod); err != nil {
+			return err
+		}
 	}
 	return nil
 }

mysqlcluster/syncer/status.go

@@ -232,8 +232,8 @@ func (s *StatusSyncer) updateNodeStatus(ctx context.Context, cli client.Client,
 		// update apiv1alpha1.NodeConditionReadOnly.
 		s.updateNodeCondition(node, int(apiv1alpha1.IndexReadOnly), isReadOnly)
 
-		if err = s.setPodHealthy(ctx, &pod, node); err != nil {
-			log.Error(err, "cannot update pod", "name", podName, "namespace", pod.Namespace)
+		if err = s.updatePodLabel(ctx, &pod, node); err != nil {
+			log.Error(err, "failed to update labels", "pod", pod.Name, "namespace", pod.Namespace)
 		}
 	}
 
@@ -358,9 +358,10 @@ func (s *StatusSyncer) addNodesInXenon(host string, toAdd []string) error {
 	return nil
 }
 
-// setPodHealthy set the pod lable healthy.
-func (s *StatusSyncer) setPodHealthy(ctx context.Context, pod *corev1.Pod, node *apiv1alpha1.NodeStatus) error {
+// updatePodLabel update the pod lables.
+func (s *StatusSyncer) updatePodLabel(ctx context.Context, pod *corev1.Pod, node *apiv1alpha1.NodeStatus) error {
 	healthy := "no"
+	isPodLabelsUpdated := false
 	if node.Conditions[apiv1alpha1.IndexLagged].Status == corev1.ConditionFalse {
 		if node.Conditions[apiv1alpha1.IndexLeader].Status == corev1.ConditionFalse &&
 			node.Conditions[apiv1alpha1.IndexReadOnly].Status == corev1.ConditionTrue &&
@@ -375,6 +376,13 @@ func (s *StatusSyncer) setPodHealthy(ctx context.Context, pod *corev1.Pod, node
 
 	if pod.Labels["healthy"] != healthy {
 		pod.Labels["healthy"] = healthy
+		isPodLabelsUpdated = true
+	}
+	if pod.Labels["role"] != node.RaftStatus.Role {
+		pod.Labels["role"] = node.RaftStatus.Role
+		isPodLabelsUpdated = true
+	}
+	if isPodLabelsUpdated {
 		if err := s.cli.Update(ctx, pod); client.IgnoreNotFound(err) != nil {
 			return err
 		}

sidecar/config.go

@@ -345,8 +345,6 @@ func (cfg *Config) buildXenonConf() []byte {
 			"admit-defeat-hearbeat-count": %d,
 			"heartbeat-timeout": %d,
 			"meta-datadir": "/var/lib/xenon/",
-			"leader-start-command": "/scripts/leader-start.sh",
-			"leader-stop-command": "/scripts/leader-stop.sh",
 			"semi-sync-degrade": true,
 			"purge-binlog-disabled": true,
 			"super-idle": false
@@ -408,25 +406,25 @@ func (cfg *Config) buildClientConfig() (*ini.File, error) {
 	return conf, nil
 }
 
-// buildLeaderStart build the leader-start.sh.
-func (cfg *Config) buildLeaderStart() []byte {
-	str := fmt.Sprintf(`#!/usr/bin/env bash
-curl -X PATCH -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" -H "Content-Type: application/json-patch+json" \
---cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_PORT_443_TCP_PORT/api/v1/namespaces/%s/pods/$HOSTNAME \
--d '[{"op": "replace", "path": "/metadata/labels/role", "value": "leader"}]'
-`, cfg.NameSpace)
-	return utils.StringToBytes(str)
-}
-
-// buildLeaderStop build the leader-stop.sh.
-func (cfg *Config) buildLeaderStop() []byte {
-	str := fmt.Sprintf(`#!/usr/bin/env bash
-curl -X PATCH -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" -H "Content-Type: application/json-patch+json" \
---cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_PORT_443_TCP_PORT/api/v1/namespaces/%s/pods/$HOSTNAME \
--d '[{"op": "replace", "path": "/metadata/labels/role", "value": "follower"}]'
-`, cfg.NameSpace)
-	return utils.StringToBytes(str)
-}
+// // buildLeaderStart build the leader-start.sh.
+// func (cfg *Config) buildLeaderStart() []byte {
+// 	str := fmt.Sprintf(`#!/usr/bin/env bash
+// curl -X PATCH -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" -H "Content-Type: application/json-patch+json" \
+// --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_PORT_443_TCP_PORT/api/v1/namespaces/%s/pods/$HOSTNAME \
+// -d '[{"op": "replace", "path": "/metadata/labels/role", "value": "leader"}]'
+// `, cfg.NameSpace)
+// 	return utils.StringToBytes(str)
+// }
+
+// // buildLeaderStop build the leader-stop.sh.
+// func (cfg *Config) buildLeaderStop() []byte {
+// 	str := fmt.Sprintf(`#!/usr/bin/env bash
+// curl -X PATCH -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" -H "Content-Type: application/json-patch+json" \
+// --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_PORT_443_TCP_PORT/api/v1/namespaces/%s/pods/$HOSTNAME \
+// -d '[{"op": "replace", "path": "/metadata/labels/role", "value": "follower"}]'
+// `, cfg.NameSpace)
+// 	return utils.StringToBytes(str)
+// }
 
 /* The function is equivalent to the following shell script template:
 #!/bin/sh

sidecar/init.go

@@ -177,19 +177,19 @@ func runInitCommand(cfg *Config) error {
 		return fmt.Errorf("failed to save extra.cnf: %s", err)
 	}
 
-	// build leader-start.sh.
-	bashLeaderStart := cfg.buildLeaderStart()
-	leaderStartPath := path.Join(scriptsPath, "leader-start.sh")
-	if err = ioutil.WriteFile(leaderStartPath, bashLeaderStart, os.FileMode(0755)); err != nil {
-		return fmt.Errorf("failed to write leader-start.sh: %s", err)
-	}
-
-	// build leader-stop.sh.
-	bashLeaderStop := cfg.buildLeaderStop()
-	leaderStopPath := path.Join(scriptsPath, "leader-stop.sh")
-	if err = ioutil.WriteFile(leaderStopPath, bashLeaderStop, os.FileMode(0755)); err != nil {
-		return fmt.Errorf("failed to write leader-stop.sh: %s", err)
-	}
+	// // build leader-start.sh.
+	// bashLeaderStart := cfg.buildLeaderStart()
+	// leaderStartPath := path.Join(scriptsPath, "leader-start.sh")
+	// if err = ioutil.WriteFile(leaderStartPath, bashLeaderStart, os.FileMode(0755)); err != nil {
+	// 	return fmt.Errorf("failed to write leader-start.sh: %s", err)
+	// }
+
+	// // build leader-stop.sh.
+	// bashLeaderStop := cfg.buildLeaderStop()
+	// leaderStopPath := path.Join(scriptsPath, "leader-stop.sh")
+	// if err = ioutil.WriteFile(leaderStopPath, bashLeaderStop, os.FileMode(0755)); err != nil {
+	// 	return fmt.Errorf("failed to write leader-stop.sh: %s", err)
+	// }
 
 	// for install tokudb.
 	if cfg.InitTokuDB {

sidecar/util.go

@@ -46,8 +46,8 @@ var (
 	// dataPath is the mysql data path.
 	dataPath = utils.DataVolumeMountPath
 
-	// scriptsPath is the scripts path used for xenon.
-	scriptsPath = utils.ScriptsVolumeMountPath
+	// // scriptsPath is the scripts path used for xenon.
+	// scriptsPath = utils.ScriptsVolumeMountPath
 
 	// sysPath is the linux kernel path used for install tokudb.
 	sysPath = utils.SysVolumeMountPath