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memetcd.go
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memetcd.go
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// Copyright (c) 2021 Terminus, Inc.
//
// This program is free software: you can use, redistribute, and/or modify
// it under the terms of the GNU Affero General Public License, version 3
// or later ("AGPL"), as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// 内存 + etcd, 内存中的数据自动与 etcd 中同步
package memetcd
import (
"context"
"strings"
"sync"
"time"
"github.com/erda-project/erda/pkg/jsonstore/etcd"
"github.com/erda-project/erda/pkg/jsonstore/mem"
"github.com/erda-project/erda/pkg/jsonstore/storetypes"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type MemEtcdStore struct {
// 保护 revision 的修改 && em与etcd之间的同步修改
sync.Mutex
mem *mem.MemStore
etcd *etcd.Store
// 被同步的 etcd 目录
etcdDir string
loadPeriod int
currentRevision int64
cb func(k, v string, t storetypes.ChangeType)
}
func New(ctx context.Context, etcdDir string, cb func(k, v string, t storetypes.ChangeType)) (*MemEtcdStore, error) {
mem, err := mem.New()
if err != nil {
return nil, err
}
etcd, err := etcd.New()
if err != nil {
return nil, err
}
s := &MemEtcdStore{
mem: mem,
etcd: etcd,
etcdDir: etcdDir,
loadPeriod: 30,
cb: cb,
}
if err := s.load(); err != nil {
return nil, err
}
go func() {
for {
select {
case <-ctx.Done():
return
default:
}
if err := s.sync(ctx); err != nil {
logrus.Errorf("MemEtcdStore sync: %v", err)
}
}
}()
return s, nil
}
func (s *MemEtcdStore) load() error {
kvs, err := s.etcd.PrefixGet(context.Background(), s.etcdDir)
if err != nil {
return err
}
if len(kvs) > 0 && kvs[0].Revision > s.currentRevision {
s.currentRevision = kvs[0].Revision
} else {
// run load again?
return nil
}
mem, err := mem.New()
if err != nil {
return err
}
oldMem := s.mem
for _, kv := range kvs {
if err := mem.Put(context.Background(), string(kv.Key), string(kv.Value)); err != nil {
return err
}
}
s.Lock()
s.mem = mem
s.Unlock()
if s.cb != nil {
if r, err := diff(oldMem, s.mem, s.etcdDir); err != nil {
return err
} else {
adds := r[0]
dels := r[1]
updates := r[2]
for _, kv := range adds {
s.cb(string(kv.Key), string(kv.Value), storetypes.Add)
}
for _, kv := range dels {
s.cb(string(kv.Key), string(kv.Value), storetypes.Del)
}
for _, kv := range updates {
s.cb(string(kv.Key), string(kv.Value), storetypes.Update)
}
}
}
return nil
}
// return ([adds, dels, updates], error)
func diff(old, new_ *mem.MemStore, prefix string) ([3][]storetypes.KeyValue, error) {
dels := []storetypes.KeyValue{}
adds := []storetypes.KeyValue{}
updates := []storetypes.KeyValue{}
kvs, err := old.PrefixGet(context.Background(), prefix)
if err != nil {
return [3][]storetypes.KeyValue{}, err
}
for _, kv := range kvs {
_, err := new_.Get(context.Background(), string(kv.Key))
if err != nil && strings.Contains(err.Error(), "not found") {
dels = append(dels, kv)
} else if err != nil {
return [3][]storetypes.KeyValue{}, err
}
}
kvs, err = new_.PrefixGet(context.Background(), prefix)
if err != nil {
return [3][]storetypes.KeyValue{}, err
}
for _, kv := range kvs {
kv_, err := old.Get(context.Background(), string(kv.Key))
if err != nil && strings.Contains(err.Error(), "not found") {
adds = append(adds, kv)
} else if err != nil {
return [3][]storetypes.KeyValue{}, err
} else if string(kv.Value) != string(kv_.Value) {
updates = append(updates, kv)
}
}
return [3][]storetypes.KeyValue{adds, dels, updates}, nil
}
func (s *MemEtcdStore) sync(ctx context.Context) error {
logrus.Info("MemEtcdStore sync start")
quit := make(chan struct{}, 1)
go func() {
for {
select {
case <-quit:
return
case <-ctx.Done():
return
case <-time.After(time.Duration(s.loadPeriod) * time.Second):
if err := s.load(); err != nil {
logrus.Errorf("MemEtcdStore: load err: %v", err)
}
}
}
}()
ch, err := s.etcd.Watch(ctx, s.etcdDir, true, false)
if err != nil {
quit <- struct{}{}
return err
}
for kvs := range ch {
if kvs.Err != nil {
logrus.Errorf("MemEtcdStore: %v", kvs.Err)
continue
}
s.Lock()
for _, kv := range kvs.Kvs {
if kv.Revision <= s.currentRevision {
break // kvs's revision is same
}
if kv.T == storetypes.Del {
if _, err := s.mem.Remove(ctx, string(kv.Key)); err != nil {
logrus.Errorf("MemEtcdStore: mem remove: %v", err)
}
} else {
if err := s.mem.Put(ctx, string(kv.Key), string(kv.Value)); err != nil {
logrus.Errorf("MemEtcdStore: mem put: %v", err)
}
}
if s.cb != nil {
s.cb(string(kv.Key), string(kv.Value), kv.T)
}
}
s.Unlock()
}
quit <- struct{}{}
logrus.Info("MemEtcdStore sync stopped")
return nil
}
func (s *MemEtcdStore) Put(ctx context.Context, key, value string) error {
if !strings.HasPrefix(key, s.etcdDir) {
return errors.Errorf("MemEtcdStore: Put: key[%s] prefix is not [%s]", key, s.etcdDir)
}
err := s.etcd.Put(context.Background(), key, value)
if err != nil {
return errors.Errorf("MemEtcdStore: etcd Put failed: %v", err)
}
s.Lock()
defer s.Unlock()
if err := s.mem.Put(context.Background(), key, value); err != nil {
return errors.Errorf("MemEtcdStore: mem Put failed: %v", err)
}
return nil
}
func (s *MemEtcdStore) PutWithOption(ctx context.Context, key, value string, opts []interface{}) (interface{}, error) {
return nil, s.Put(ctx, key, value)
}
func (s *MemEtcdStore) Get(ctx context.Context, key string) (storetypes.KeyValue, error) {
if !strings.HasPrefix(key, s.etcdDir) {
return storetypes.KeyValue{}, errors.Errorf("MemEtcdStore: Get: key[%s] prefix is not [%s]", key, s.etcdDir)
}
s.Lock()
kv, err := s.mem.Get(context.Background(), key)
s.Unlock()
// err: not found
if err != nil {
if kv, err = s.etcd.Get(ctx, key); err != nil {
return kv, err
}
}
return kv, nil
}
func (s *MemEtcdStore) Remove(ctx context.Context, key string) (*storetypes.KeyValue, error) {
if !strings.HasPrefix(key, s.etcdDir) {
return nil, errors.Errorf("MemEtcdStore: Remove: key[%s] prefix is not [%s]", key, s.etcdDir)
}
kv, err := s.etcd.Remove(context.Background(), key)
if err != nil {
return nil, errors.Errorf("MemEtcdStore: etcd Remove failed: %v", err)
}
s.Lock()
defer s.Unlock()
if _, err := s.mem.Remove(context.Background(), key); err != nil {
return nil, errors.Errorf("MemEtcdStore: mem Remove failed: %v", err)
}
return kv, nil
}
func (s *MemEtcdStore) PrefixRemove(pctx context.Context, prefix string) ([]storetypes.KeyValue, error) {
if !strings.HasPrefix(prefix, s.etcdDir) {
return nil, errors.Errorf("MemEtcdStore: PrefixRemove: key[%s] prefix is not [%s]", prefix, s.etcdDir)
}
kvs, err := s.etcd.PrefixRemove(context.Background(), prefix)
if err != nil {
return nil, errors.Errorf("MemEtcdStore: etcd PrefixRemove failed: %v", err)
}
s.Lock()
defer s.Unlock()
if _, err := s.mem.PrefixRemove(context.Background(), prefix); err != nil {
return nil, errors.Errorf("MemEtcdStore: mem PrefixRemove failed: %v", err)
}
return kvs, nil
}
func (s *MemEtcdStore) PrefixGet(ctx context.Context, prefix string) ([]storetypes.KeyValue, error) {
if !strings.HasPrefix(prefix, s.etcdDir) {
return nil, errors.Errorf("MemEtcdStore: PrefixGet: key[%s] prefix is not [%s]", prefix, s.etcdDir)
}
s.Lock()
defer s.Unlock()
return s.mem.PrefixGet(context.Background(), prefix)
}
func (s *MemEtcdStore) PrefixGetKey(ctx context.Context, prefix string) ([]storetypes.Key, error) {
if !strings.HasPrefix(prefix, s.etcdDir) {
return nil, errors.Errorf("MemEtcdStore: PrefixGet: key[%s] prefix is not [%s]", prefix, s.etcdDir)
}
s.Lock()
defer s.Unlock()
return s.mem.PrefixGetKey(context.Background(), prefix)
}
func (s *MemEtcdStore) Watch(ctx context.Context, key string, isPrefix bool, filterDelete bool) (storetypes.WatchChan, error) {
if !strings.HasPrefix(key, s.etcdDir) {
return nil, errors.Errorf("MemEtcdStore: Watch: key[%s] prefix is not [%s]", key, s.etcdDir)
}
return s.etcd.Watch(ctx, key, isPrefix, filterDelete)
}