khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 1 | // Copyright 2016 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | // Package alarm manages health status alarms in etcd. |
| 16 | package alarm |
| 17 | |
| 18 | import ( |
| 19 | "sync" |
| 20 | |
| 21 | pb "github.com/coreos/etcd/etcdserver/etcdserverpb" |
| 22 | "github.com/coreos/etcd/mvcc/backend" |
| 23 | "github.com/coreos/etcd/pkg/types" |
| 24 | "github.com/coreos/pkg/capnslog" |
| 25 | ) |
| 26 | |
| 27 | var ( |
| 28 | alarmBucketName = []byte("alarm") |
| 29 | plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "alarm") |
| 30 | ) |
| 31 | |
| 32 | type BackendGetter interface { |
| 33 | Backend() backend.Backend |
| 34 | } |
| 35 | |
| 36 | type alarmSet map[types.ID]*pb.AlarmMember |
| 37 | |
| 38 | // AlarmStore persists alarms to the backend. |
| 39 | type AlarmStore struct { |
| 40 | mu sync.Mutex |
| 41 | types map[pb.AlarmType]alarmSet |
| 42 | |
| 43 | bg BackendGetter |
| 44 | } |
| 45 | |
| 46 | func NewAlarmStore(bg BackendGetter) (*AlarmStore, error) { |
| 47 | ret := &AlarmStore{types: make(map[pb.AlarmType]alarmSet), bg: bg} |
| 48 | err := ret.restore() |
| 49 | return ret, err |
| 50 | } |
| 51 | |
| 52 | func (a *AlarmStore) Activate(id types.ID, at pb.AlarmType) *pb.AlarmMember { |
| 53 | a.mu.Lock() |
| 54 | defer a.mu.Unlock() |
| 55 | |
| 56 | newAlarm := &pb.AlarmMember{MemberID: uint64(id), Alarm: at} |
| 57 | if m := a.addToMap(newAlarm); m != newAlarm { |
| 58 | return m |
| 59 | } |
| 60 | |
| 61 | v, err := newAlarm.Marshal() |
| 62 | if err != nil { |
| 63 | plog.Panicf("failed to marshal alarm member") |
| 64 | } |
| 65 | |
| 66 | b := a.bg.Backend() |
| 67 | b.BatchTx().Lock() |
| 68 | b.BatchTx().UnsafePut(alarmBucketName, v, nil) |
| 69 | b.BatchTx().Unlock() |
| 70 | |
| 71 | return newAlarm |
| 72 | } |
| 73 | |
| 74 | func (a *AlarmStore) Deactivate(id types.ID, at pb.AlarmType) *pb.AlarmMember { |
| 75 | a.mu.Lock() |
| 76 | defer a.mu.Unlock() |
| 77 | |
| 78 | t := a.types[at] |
| 79 | if t == nil { |
| 80 | t = make(alarmSet) |
| 81 | a.types[at] = t |
| 82 | } |
| 83 | m := t[id] |
| 84 | if m == nil { |
| 85 | return nil |
| 86 | } |
| 87 | |
| 88 | delete(t, id) |
| 89 | |
| 90 | v, err := m.Marshal() |
| 91 | if err != nil { |
| 92 | plog.Panicf("failed to marshal alarm member") |
| 93 | } |
| 94 | |
| 95 | b := a.bg.Backend() |
| 96 | b.BatchTx().Lock() |
| 97 | b.BatchTx().UnsafeDelete(alarmBucketName, v) |
| 98 | b.BatchTx().Unlock() |
| 99 | |
| 100 | return m |
| 101 | } |
| 102 | |
| 103 | func (a *AlarmStore) Get(at pb.AlarmType) (ret []*pb.AlarmMember) { |
| 104 | a.mu.Lock() |
| 105 | defer a.mu.Unlock() |
| 106 | if at == pb.AlarmType_NONE { |
| 107 | for _, t := range a.types { |
| 108 | for _, m := range t { |
| 109 | ret = append(ret, m) |
| 110 | } |
| 111 | } |
| 112 | return ret |
| 113 | } |
| 114 | for _, m := range a.types[at] { |
| 115 | ret = append(ret, m) |
| 116 | } |
| 117 | return ret |
| 118 | } |
| 119 | |
| 120 | func (a *AlarmStore) restore() error { |
| 121 | b := a.bg.Backend() |
| 122 | tx := b.BatchTx() |
| 123 | |
| 124 | tx.Lock() |
| 125 | tx.UnsafeCreateBucket(alarmBucketName) |
| 126 | err := tx.UnsafeForEach(alarmBucketName, func(k, v []byte) error { |
| 127 | var m pb.AlarmMember |
| 128 | if err := m.Unmarshal(k); err != nil { |
| 129 | return err |
| 130 | } |
| 131 | a.addToMap(&m) |
| 132 | return nil |
| 133 | }) |
| 134 | tx.Unlock() |
| 135 | |
| 136 | b.ForceCommit() |
| 137 | return err |
| 138 | } |
| 139 | |
| 140 | func (a *AlarmStore) addToMap(newAlarm *pb.AlarmMember) *pb.AlarmMember { |
| 141 | t := a.types[newAlarm.Alarm] |
| 142 | if t == nil { |
| 143 | t = make(alarmSet) |
| 144 | a.types[newAlarm.Alarm] = t |
| 145 | } |
| 146 | m := t[types.ID(newAlarm.MemberID)] |
| 147 | if m != nil { |
| 148 | return m |
| 149 | } |
| 150 | t[types.ID(newAlarm.MemberID)] = newAlarm |
| 151 | return newAlarm |
| 152 | } |