Revert "Introduce Manager.Ctx()"

This reverts commit 27bd71f.

owner/manager.go

@@ -50,8 +50,6 @@ type Manager interface {
 	CampaignOwner() error
 	// ResignOwner lets the owner start a new election.
 	ResignOwner(ctx context.Context) error
-	// Ctx returns the context of the manager.
-	Ctx() context.Context
 	// Cancel cancels this etcd ownerManager.
 	Cancel()
 	// RequireOwner requires the ownerManager is owner.
@@ -115,11 +113,6 @@ func (m *ownerManager) IsOwner() bool {
 	return atomic.LoadPointer(&m.elec) != unsafe.Pointer(nil)
 }
 
-// Ctx implements Manager.Ctx interface.
-func (m *ownerManager) Ctx() context.Context {
-	return m.ctx
-}
-
 // Cancel implements Manager.Cancel interface.
 func (m *ownerManager) Cancel() {
 	m.cancel()
@@ -156,12 +149,12 @@ func setManagerSessionTTL() error {
 func (m *ownerManager) CampaignOwner() error {
 	logPrefix := fmt.Sprintf("[%s] %s", m.prompt, m.key)
 	logutil.BgLogger().Info("start campaign owner", zap.String("ownerInfo", logPrefix))
-	etcdSession, err := util2.NewSession(m.ctx, logPrefix, m.etcdCli, util2.NewSessionDefaultRetryCnt, ManagerSessionTTL)
+	session, err := util2.NewSession(m.ctx, logPrefix, m.etcdCli, util2.NewSessionDefaultRetryCnt, ManagerSessionTTL)
 	if err != nil {
 		return errors.Trace(err)
 	}
 	m.wg.Add(1)
-	go m.campaignLoop(etcdSession)
+	go m.campaignLoop(session)
 	return nil
 }
 

owner/mock.go

@@ -29,7 +29,6 @@ var _ Manager = &mockManager{}
 type mockManager struct {
 	owner       int32
 	id          string // id is the ID of manager.
-	ctx         context.Context
 	cancel      context.CancelFunc
 	beOwnerHook func()
 }
@@ -43,11 +42,6 @@ func NewMockManager(ctx context.Context, id string) Manager {
 	}
 }
 
-// Ctx implements Manager.Ctx interface
-func (m *mockManager) Ctx() context.Context {
-	return m.ctx
-}
-
 // ID implements Manager.ID interface.
 func (m *mockManager) ID() string {
 	return m.id