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alarms.go
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/
alarms.go
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// Package v3alarm manages health status alarms in etcd.
package v3alarm
import (
"sync"
pb "github.com/oldnicke/etcd/etcdserver/etcdserverpb"
"github.com/oldnicke/etcd/mvcc/backend"
"github.com/oldnicke/etcd/pkg/types"
"github.com/coreos/pkg/capnslog"
)
var (
alarmBucketName = []byte("alarm")
plog = capnslog.NewPackageLogger("github.com/oldnicke/etcd", "alarm")
)
type BackendGetter interface {
Backend() backend.Backend
}
type alarmSet map[types.ID]*pb.AlarmMember
// AlarmStore persists alarms to the backend.
type AlarmStore struct {
mu sync.Mutex
types map[pb.AlarmType]alarmSet
bg BackendGetter
}
func NewAlarmStore(bg BackendGetter) (*AlarmStore, error) {
ret := &AlarmStore{types: make(map[pb.AlarmType]alarmSet), bg: bg}
err := ret.restore()
return ret, err
}
func (a *AlarmStore) Activate(id types.ID, at pb.AlarmType) *pb.AlarmMember {
a.mu.Lock()
defer a.mu.Unlock()
newAlarm := &pb.AlarmMember{MemberID: uint64(id), Alarm: at}
if m := a.addToMap(newAlarm); m != newAlarm {
return m
}
v, err := newAlarm.Marshal()
if err != nil {
plog.Panicf("failed to marshal alarm member")
}
b := a.bg.Backend()
b.BatchTx().Lock()
b.BatchTx().UnsafePut(alarmBucketName, v, nil)
b.BatchTx().Unlock()
return newAlarm
}
func (a *AlarmStore) Deactivate(id types.ID, at pb.AlarmType) *pb.AlarmMember {
a.mu.Lock()
defer a.mu.Unlock()
t := a.types[at]
if t == nil {
t = make(alarmSet)
a.types[at] = t
}
m := t[id]
if m == nil {
return nil
}
delete(t, id)
v, err := m.Marshal()
if err != nil {
plog.Panicf("failed to marshal alarm member")
}
b := a.bg.Backend()
b.BatchTx().Lock()
b.BatchTx().UnsafeDelete(alarmBucketName, v)
b.BatchTx().Unlock()
return m
}
func (a *AlarmStore) Get(at pb.AlarmType) (ret []*pb.AlarmMember) {
a.mu.Lock()
defer a.mu.Unlock()
if at == pb.AlarmType_NONE {
for _, t := range a.types {
for _, m := range t {
ret = append(ret, m)
}
}
return ret
}
for _, m := range a.types[at] {
ret = append(ret, m)
}
return ret
}
func (a *AlarmStore) restore() error {
b := a.bg.Backend()
tx := b.BatchTx()
tx.Lock()
tx.UnsafeCreateBucket(alarmBucketName)
err := tx.UnsafeForEach(alarmBucketName, func(k, v []byte) error {
var m pb.AlarmMember
if err := m.Unmarshal(k); err != nil {
return err
}
a.addToMap(&m)
return nil
})
tx.Unlock()
b.ForceCommit()
return err
}
func (a *AlarmStore) addToMap(newAlarm *pb.AlarmMember) *pb.AlarmMember {
t := a.types[newAlarm.Alarm]
if t == nil {
t = make(alarmSet)
a.types[newAlarm.Alarm] = t
}
m := t[types.ID(newAlarm.MemberID)]
if m != nil {
return m
}
t[types.ID(newAlarm.MemberID)] = newAlarm
return newAlarm
}