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metasync.go
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metasync.go
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/*
* Copyright 2022 Holoinsight Project Authors. Licensed under Apache-2.0.
*/
package k8ssync
import (
"errors"
"github.com/traas-stack/holoinsight-agent/pkg/appconfig"
k8smetaextractor "github.com/traas-stack/holoinsight-agent/pkg/k8s/k8smeta/extractor"
"github.com/traas-stack/holoinsight-agent/pkg/k8s/k8sutils"
"github.com/traas-stack/holoinsight-agent/pkg/k8s/listwatchext"
"github.com/traas-stack/holoinsight-agent/pkg/logger"
"github.com/traas-stack/holoinsight-agent/pkg/server/registry"
regpb "github.com/traas-stack/holoinsight-agent/pkg/server/registry/pb"
"go.uber.org/zap"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"time"
)
const (
defaultListWatchRestartInterval = 10 * time.Minute
defaultEventMergeInterval = 3 * time.Second
)
type (
MetaSyncer interface {
Start()
Stop()
}
metaSyncer struct {
rs *registry.Service
clientset *kubernetes.Clientset
namespaceChanged int32
nodeChanged int32
podChanged int32
}
convertFunc func(obj interface{}) *Resource
deleteStatusFunc func(obj interface{}) bool
resourceFuncs struct {
convert convertFunc
delete deleteStatusFunc
}
resourceSyncer struct {
ms *metaSyncer
getter cache.Getter
resource string
namespace string
objType runtime.Object
reportType string
funcs resourceFuncs
verbose bool
}
)
func NewMetaSyncer(rs *registry.Service, clientset *kubernetes.Clientset) MetaSyncer {
return &metaSyncer{
rs: rs,
clientset: clientset,
}
}
func newResourceSyncer(ms *metaSyncer, resource string, namespace string, objType runtime.Object, reportType string, funcs resourceFuncs) *resourceSyncer {
return &resourceSyncer{
ms: ms,
getter: ms.clientset.CoreV1().RESTClient(),
resource: resource,
namespace: namespace,
objType: objType,
reportType: reportType,
funcs: funcs,
}
}
// 开始监听
func (rs *resourceSyncer) start(stopCh <-chan struct{}) {
lw := listwatchext.NewListWatchFromClient(rs.getter, rs.resource, rs.namespace)
em := listwatchext.NewEventMerger(defaultEventMergeInterval, func(merged map[string]watch.Event) {
req := &DeltaSyncRequest{
Apikey: appconfig.StdAgentConfig.ApiKey,
Type: rs.reportType,
Workspace: appconfig.StdAgentConfig.Workspace,
Cluster: appconfig.StdAgentConfig.Cluster,
}
for _, e := range merged {
resource := rs.funcs.convert(e.Object)
deleted := e.Type == watch.Deleted
if !deleted && rs.funcs.delete != nil {
deleted = rs.funcs.delete(e.Object)
}
if deleted {
req.Del = append(req.Del, resource)
} else {
req.Add = append(req.Add, resource)
}
}
if code, body, cost, err := rs.ms.syncToReg(req); err == nil {
logger.Metaz("delta sync success",
zap.Int("code", code),
zap.String("body", body),
zap.String("type", rs.reportType),
zap.Int("add", len(req.Add)),
zap.Int("del", len(req.Del)),
zap.Duration("cost", cost))
if rs.verbose {
logger.Metaz("delta sync success", zap.Any("req", req))
}
} else {
logger.Metaz("delta sync error",
zap.Int("code", code),
zap.String("body", body),
zap.String("type", rs.reportType),
zap.Int("add", len(req.Add)),
zap.Int("del", len(req.Del)),
zap.Duration("cost", cost),
zap.Error(err))
if rs.verbose {
logger.Metaz("delta sync error", zap.Any("req", req))
}
}
}, stopCh)
helper := listwatchext.NewListWatchHelper(lw, listwatchext.ListWatchCallback{
OnList: func(items []runtime.Object) {
req := &FullSyncRequest{
Apikey: appconfig.StdAgentConfig.ApiKey,
Type: rs.reportType,
Workspace: appconfig.StdAgentConfig.Workspace,
Cluster: appconfig.StdAgentConfig.Cluster,
}
for _, item := range items {
if rs.funcs.delete != nil && rs.funcs.delete(item) {
continue
}
req.Resources = append(req.Resources, rs.funcs.convert(item))
}
if code, body, cost, err := rs.ms.syncToReg(req); err == nil {
logger.Metaz("full sync success",
zap.Int("code", code),
zap.String("body", body),
zap.String("type", rs.reportType),
zap.Int("size", len(items)),
zap.Duration("cost", cost))
} else {
logger.Metaz("full sync error",
zap.Int("code", code),
zap.String("body", body),
zap.String("type", rs.reportType),
zap.Duration("cost", cost),
zap.Int("size", len(items)),
zap.Error(err))
}
},
OnEvent: func(e watch.Event) {
if rs.verbose {
if ma, err := meta.Accessor(e.Object); err == nil {
ns := ma.GetNamespace()
name := ma.GetName()
logger.Metaz("onEvent", zap.String("type", string(e.Type)), zap.String("ns", ns), zap.String("name", name))
}
}
em.Add(e)
},
})
go helper.Run(stopCh)
}
func (s *metaSyncer) Stop() {}
func (s *metaSyncer) Start() {
// 步骤
// 1. list, 然后立即与reg进行一次全量同步, 如果失败则退避重试
// 2. watch, 攒批然后与reg进行增量同步, 遇到失败可重试(因为是幂等的), 如果重试无法成功则退出重新list&watch
// 3. 兜底测策略, 每N(默认10)分钟强制重新list&watch一次
go s.runLoop()
}
func (s *metaSyncer) runLoop() {
start := time.NewTimer(0)
defer start.Stop()
stop := time.NewTimer(defaultListWatchRestartInterval)
defer stop.Stop()
var stopCh chan struct{}
for {
select {
case <-start.C:
stopCh = make(chan struct{})
logger.Metaz("[listwatch] start")
s.runOnce(stopCh)
stop.Reset(defaultListWatchRestartInterval)
case <-stop.C:
close(stopCh)
logger.Metaz("[listwatch] stop and restart after 1 s")
start.Reset(time.Second)
}
}
}
func (s *metaSyncer) runOnce(stopCh <-chan struct{}) {
{
rs := newResourceSyncer(s, "nodes", v1.NamespaceAll, &v1.Node{}, "NODE", resourceFuncs{
convert: func(obj interface{}) *Resource {
return s.convertNodeToResource(obj.(*v1.Node))
},
delete: func(obj interface{}) bool {
node := obj.(*v1.Node)
return node.Status.Phase == v1.NodeTerminated
},
})
rs.start(stopCh)
}
{
rs := newResourceSyncer(s, string(v1.ResourcePods), v1.NamespaceAll, &v1.Pod{}, "POD", resourceFuncs{
convert: func(obj interface{}) *Resource {
return s.convertPodToResource(obj.(*v1.Pod))
},
delete: func(obj interface{}) bool {
pod := obj.(*v1.Pod)
return pod.Status.Phase == v1.PodSucceeded || pod.Status.Phase == v1.PodFailed
},
})
rs.verbose = true
rs.start(stopCh)
}
}
func (s *metaSyncer) syncToReg(req interface{}) (int, string, time.Duration, error) {
// 可以适当重试
begin := time.Now()
var err error
switch x := req.(type) {
case *FullSyncRequest:
pbReq := ®pb.MetaSync_FullSyncRequest{
Workspace: x.Workspace,
Cluster: x.Cluster,
Type: x.Type,
Resource: convertToPbResourceSlice(x.Resources),
}
err = s.rs.MetaFullSync(pbReq)
case *DeltaSyncRequest:
pbReq := ®pb.MetaSync_DeltaSyncRequest{
Workspace: x.Workspace,
Cluster: x.Cluster,
Type: x.Type,
Add: convertToPbResourceSlice(x.Add),
Del: convertToPbResourceSlice(x.Del),
}
err = s.rs.MetaDeltaSync(pbReq)
default:
err = errors.New("unsupported sync type")
}
return 0, "", time.Now().Sub(begin), err
}
func (s *metaSyncer) convertNodeToResource(node *v1.Node) *Resource {
ip := k8sutils.GetNodeIP(node)
return &Resource{
Name: node.Name,
Namespace: "",
Labels: node.Labels,
Annotations: node.Annotations,
Ip: ip,
HostIP: ip,
Hostname: k8smetaextractor.PodMetaServiceInstance.NodeHostname(node),
Status: string(node.Status.Phase),
}
}
func (s *metaSyncer) convertPodToResource(pod *v1.Pod) *Resource {
app := k8smetaextractor.DefaultPodMetaService.ExtractApp(pod)
hostname := k8smetaextractor.PodMetaServiceInstance.ExtractHostname(pod)
return &Resource{
Name: pod.Name,
Namespace: pod.Namespace,
App: app,
Labels: pod.Labels,
Annotations: pod.Annotations,
Ip: pod.Status.PodIP,
Hostname: hostname,
HostIP: pod.Status.HostIP,
Status: string(pod.Status.Phase),
}
}