feat: veth watcher

pkg/managers/pluginmanager/pluginmanager.go

@@ -39,7 +39,7 @@ type PluginManager struct {
 	plugins map[string]plugin.Plugin
 	tel     telemetry.Telemetry
 
-	watcherManager watchermanager.IWatcherManager
+	watcherManager watchermanager.Manager
 }
 
 func NewPluginManager(cfg *kcfg.Config, tel telemetry.Telemetry) (*PluginManager, error) {

pkg/managers/pluginmanager/pluginmanager_test.go

@@ -38,8 +38,8 @@ var (
 	}
 )
 
-func setupWatcherManagerMock(ctl *gomock.Controller) (m *watchermock.MockIWatcherManager) {
-	m = watchermock.NewMockIWatcherManager(ctl)
+func setupWatcherManagerMock(ctl *gomock.Controller) (m *watchermock.MockManager) {
+	m = watchermock.NewMockManager(ctl)
 	m.EXPECT().Start(gomock.Any()).Return(nil).AnyTimes()
 	m.EXPECT().Stop(gomock.Any()).Return(nil).AnyTimes()
 	return
@@ -456,7 +456,7 @@ func TestWatcherManagerFailure(t *testing.T) {
 	defer ctl.Finish()
 	log.SetupZapLogger(log.GetDefaultLogOpts())
 
-	m := watchermock.NewMockIWatcherManager(ctl)
+	m := watchermock.NewMockManager(ctl)
 	m.EXPECT().Start(gomock.Any()).Return(errors.New("error")).AnyTimes()
 
 	cfg := cfgPodLevelEnabled

pkg/managers/watchermanager/types.go

@@ -5,29 +5,24 @@ package watchermanager
 
 import (
 	"context"
-	"sync"
-	"time"
 
 	"github.com/microsoft/retina/pkg/log"
 )
 
 //go:generate go run go.uber.org/mock/[email protected] -source=types.go -destination=mocks/mock_types.go -package=mocks .
-type IWatcher interface {
-	// Init, Stop, and Refresh should only be called by watchermanager.
-	Init(ctx context.Context) error
+type Watcher interface {
+	// Start and Stop should only be called by watchermanager.
+	Start(ctx context.Context) error
 	Stop(ctx context.Context) error
-	Refresh(ctx context.Context) error
+	Name() string
 }
 
-type IWatcherManager interface {
+type Manager interface {
 	Start(ctx context.Context) error
 	Stop(ctx context.Context) error
 }
 
 type WatcherManager struct {
-	Watchers    []IWatcher
-	l           *log.ZapLogger
-	refreshRate time.Duration
-	cancel      context.CancelFunc
-	wg          sync.WaitGroup
+	Watchers []Watcher
+	l        *log.ZapLogger
 }

pkg/managers/watchermanager/watchermanager.go

@@ -5,13 +5,14 @@ package watchermanager
 
 import (
 	"context"
-	"fmt"
 	"time"
 
 	"github.com/microsoft/retina/pkg/log"
 	"github.com/microsoft/retina/pkg/watchers/apiserver"
 	"github.com/microsoft/retina/pkg/watchers/endpoint"
+	"github.com/pkg/errors"
 	"go.uber.org/zap"
+	"golang.org/x/sync/errgroup"
 )
 
 const (
@@ -21,61 +22,39 @@ const (
 
 func NewWatcherManager() *WatcherManager {
 	return &WatcherManager{
-		Watchers: []IWatcher{
-			endpoint.Watcher(),
-			apiserver.Watcher(),
+		Watchers: []Watcher{
+			apiserver.NewWatcher(),
+			endpoint.NewWatcher(),
 		},
-		l:           log.Logger().Named("watcher-manager"),
-		refreshRate: DefaultRefreshRate,
+		l: log.Logger().Named("watcher-manager"),
 	}
 }
 
 func (wm *WatcherManager) Start(ctx context.Context) error {
-	newCtx, cancelCtx := context.WithCancel(ctx)
-	wm.cancel = cancelCtx
-
+	wm.l.Info("starting watcher manager")
+	// start all watchers
+	g, ctx := errgroup.WithContext(ctx)
 	for _, w := range wm.Watchers {
-		if err := w.Init(ctx); err != nil {
-			wm.l.Error("init failed", zap.String("watcher_type", fmt.Sprintf("%T", w)), zap.Error(err))
-			return err
-		}
-		wm.wg.Add(1)
-		go wm.runWatcher(newCtx, w)
-		wm.l.Info("watcher started", zap.String("watcher_type", fmt.Sprintf("%T", w)))
+		w := w
+		g.Go(func() error {
+			wm.l.Info("starting watcher", zap.String("name", w.Name()))
+			err := w.Start(ctx)
+			if err != nil {
+				wm.l.Error("watcher exited with error", zap.Error(err), zap.String("name", w.Name()))
+				return errors.Wrap(err, "watcher exited with error")
+			}
+			return nil
+		})
+	}
+	err := g.Wait()
+	if err != nil {
+		wm.l.Error("watcher manager exited with error", zap.Error(err))
+		return errors.Wrap(err, "watcher manager exited with error")
 	}
 	return nil
 }
 
 func (wm *WatcherManager) Stop(ctx context.Context) error {
-	if wm.cancel != nil {
-		wm.cancel() // cancel all runWatcher
-	}
-	for _, w := range wm.Watchers {
-		if err := w.Stop(ctx); err != nil {
-			wm.l.Error("failed to stop", zap.String("watcher_type", fmt.Sprintf("%T", w)), zap.Error(err))
-			return err
-		}
-	}
-	wm.wg.Wait() // wait for all runWatcher to stop
 	wm.l.Info("watcher manager stopped")
 	return nil
 }
-
-func (wm *WatcherManager) runWatcher(ctx context.Context, w IWatcher) error {
-	defer wm.wg.Done() // signal that this runWatcher is done
-	ticker := time.NewTicker(wm.refreshRate)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-ctx.Done():
-			wm.l.Info("watcher stopping...", zap.String("watcher_type", fmt.Sprintf("%T", w)))
-			return nil
-		case <-ticker.C:
-			err := w.Refresh(ctx)
-			if err != nil {
-				wm.l.Error("refresh failed", zap.Error(err))
-				return err
-			}
-		}
-	}
-}