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watcher.go
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watcher.go
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package etcd
import (
"context"
"errors"
"github.com/infraboard/mcube/logger"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
"github.com/infraboard/workflow/api/apps/pipeline"
"github.com/infraboard/workflow/common/cache"
informer "github.com/infraboard/workflow/common/informers/pipeline"
)
type shared struct {
log logger.Logger
client clientv3.Watcher
indexer cache.Indexer
handler informer.PipelineEventHandler
filter informer.PipelineFilterHandler
watchChan clientv3.WatchChan
}
// AddPipelineEventHandler 添加事件处理回调
func (i *shared) AddPipelineTaskEventHandler(h informer.PipelineEventHandler) {
i.handler = h
}
// Run 启动 Watch
func (i *shared) Run(ctx context.Context) error {
// 是否准备完成
if err := i.isReady(); err != nil {
return err
}
// 监听事件
i.watch(ctx)
// 后台处理事件
go i.dealEvents()
return nil
}
func (i *shared) dealEvents() {
// 处理所有事件
for {
select {
case nodeResp := <-i.watchChan:
for _, event := range nodeResp.Events {
switch event.Type {
case mvccpb.PUT:
if err := i.handlePut(event, nodeResp.Header.GetRevision()); err != nil {
i.log.Error(err)
}
case mvccpb.DELETE:
if err := i.handleDelete(event); err != nil {
i.log.Error(err)
}
default:
}
}
}
}
}
func (i *shared) isReady() error {
if i.handler == nil {
return errors.New("PipelineEventHandler not add")
}
return nil
}
func (i *shared) watch(ctx context.Context) {
ppWatchKey := pipeline.EtcdPipelinePrefix()
i.watchChan = i.client.Watch(ctx, ppWatchKey, clientv3.WithPrefix())
i.log.Infof("watch etcd pipeline resource key: %s", ppWatchKey)
}
func (i *shared) handlePut(event *clientv3.Event, eventVersion int64) error {
i.log.Debugf("receive pipeline put event, %s", event.Kv.Key)
// 解析对象
new, err := pipeline.LoadPipelineFromBytes(event.Kv.Value)
if err != nil {
return err
}
new.ResourceVersion = eventVersion
old, hasOld, err := i.indexer.GetByKey(new.MakeObjectKey())
if err != nil {
return err
}
if i.filter != nil {
if err := i.filter(new); err != nil {
return err
}
}
// 区分Update
if hasOld {
// 更新缓存
i.log.Debugf("update pipeline: %s", new.ShortDescribe())
if err := i.indexer.Update(new); err != nil {
i.log.Errorf("update indexer cache error, %s", err)
}
i.handler.OnUpdate(old.(*pipeline.Pipeline), new)
} else {
// 添加缓存
i.log.Debugf("add pipeline: %s", new.ShortDescribe())
if err := i.indexer.Add(new); err != nil {
i.log.Errorf("add indexer cache error, %s", err)
}
i.handler.OnAdd(new)
}
return nil
}
func (i *shared) handleDelete(event *clientv3.Event) error {
key := event.Kv.Key
i.log.Debugf("receive pipeline delete event, %s", key)
obj, ok, err := i.indexer.GetByKey(string(key))
if err != nil {
i.log.Errorf("get key %s from store error, %s", key)
}
if !ok {
i.log.Warnf("key %s found in store", key)
}
// 清除缓存
if err := i.indexer.Delete(obj); err != nil {
i.log.Errorf("delete indexer cache error, %s", err)
}
pl, ok := obj.(*pipeline.Pipeline)
if ok {
i.handler.OnDelete(pl)
}
return nil
}