forked from bitpoke/mysql-operator
/
pod.go
107 lines (84 loc) · 2.73 KB
/
pod.go
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/*
Copyright 2018 Pressinfra SRL
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package mysqlcluster
import (
"fmt"
"strings"
core "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/presslabs/controller-util/syncer"
api "github.com/presslabs/mysql-operator/pkg/apis/mysql/v1alpha1"
"github.com/presslabs/mysql-operator/pkg/internal/mysqlcluster"
)
type podSyncer struct {
cluster *mysqlcluster.MysqlCluster
hostname string
}
const (
labelMaster = "master"
labelReplica = "replica"
labelHealty = "yes"
labelNotHealty = "no"
)
// NewPodSyncer returns the syncer for pod
func NewPodSyncer(c client.Client, scheme *runtime.Scheme, cluster *mysqlcluster.MysqlCluster, host string) syncer.Interface {
obj := &core.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: getPodNameForHost(host),
Namespace: cluster.Namespace,
},
}
sync := &podSyncer{
cluster: cluster,
hostname: host,
}
return syncer.NewObjectSyncer("Pod", nil, obj, c, scheme, sync.SyncFn)
}
// nolint: gocyclo
func (s *podSyncer) SyncFn(in runtime.Object) error {
out := in.(*core.Pod)
// raise error if pod is not created
if out.CreationTimestamp.IsZero() {
return NewPodNotFoundError()
}
master := s.cluster.GetNodeCondition(s.hostname, api.NodeConditionMaster)
replicating := s.cluster.GetNodeCondition(s.hostname, api.NodeConditionReplicating)
lagged := s.cluster.GetNodeCondition(s.hostname, api.NodeConditionLagged)
if master == nil {
return fmt.Errorf("master status condition not set")
}
isMaster := master.Status == core.ConditionTrue
isLagged := lagged != nil && lagged.Status == core.ConditionTrue
isReplicating := replicating != nil && replicating.Status == core.ConditionTrue
// set role label
role := labelReplica
if isMaster {
role = labelMaster
}
// set healthy label
healthy := labelNotHealty
if isMaster || !isMaster && isReplicating && !isLagged {
healthy = labelHealty
}
if len(out.ObjectMeta.Labels) == 0 {
out.ObjectMeta.Labels = map[string]string{}
}
out.ObjectMeta.Labels["role"] = role
out.ObjectMeta.Labels["healthy"] = healthy
return nil
}
func getPodNameForHost(host string) string {
return strings.SplitN(host, ".", 2)[0]
}