control/controlclient: remove unused StartLogout

Updates #cleanup

Co-authored-by: Maisem Ali <maisem@tailscale.com>
Change-Id: I9d052fdbee787f1e8c872124e4bee61c7f04d142
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

ipn/ipnlocal/local.go

@@ -3910,18 +3910,7 @@ func (b *LocalBackend) ShouldHandleViaIP(ip netip.Addr) bool {
 	return false
 }
 
-// Logout tells the controlclient that we want to log out, and
-// transitions the local engine to the logged-out state without
-// waiting for controlclient to be in that state.
-func (b *LocalBackend) Logout() {
-	b.logout(context.Background(), false)
-}
-
 func (b *LocalBackend) LogoutSync(ctx context.Context) error {
-	return b.logout(ctx, true)
-}
-
-func (b *LocalBackend) logout(ctx context.Context, sync bool) error {
 	b.mu.Lock()
 	cc := b.cc
 	b.mu.Unlock()
@@ -3946,13 +3935,7 @@ func (b *LocalBackend) logout(ctx context.Context, sync bool) error {
 		return errors.New("no controlclient")
 	}
 
-	var err error
-	if sync {
-		err = cc.Logout(ctx)
-	} else {
-		cc.StartLogout()
-	}
-
+	err := cc.Logout(ctx)
 	b.stateMachine()
 	return err
 }

ipn/ipnlocal/local_test.go

@@ -826,9 +826,6 @@ type legacyBackend interface {
 	StartLoginInteractive()
 	// Login logs in with an OAuth2 token.
 	Login(token *tailcfg.Oauth2Token)
-	// Logout terminates the current login session and stops the
-	// wireguard engine.
-	Logout()
 	// SetPrefs installs a new set of user preferences, including
 	// WantRunning. This may cause the wireguard engine to
 	// reconfigure or stop.

ipn/ipnlocal/state_test.go

@@ -217,11 +217,6 @@ func (cc *mockControl) Login(t *tailcfg.Oauth2Token, flags controlclient.LoginFl
 	cc.authBlocked = interact || newKeys
 }
 
-func (cc *mockControl) StartLogout() {
-	cc.logf("StartLogout")
-	cc.called("StartLogout")
-}
-
 func (cc *mockControl) Logout(ctx context.Context) error {
 	cc.logf("Logout")
 	cc.called("Logout")
@@ -329,10 +324,10 @@ func TestStateMachine(t *testing.T) {
 			(n.Prefs != nil && n.Prefs.Valid()) ||
 			n.BrowseToURL != nil ||
 			n.LoginFinished != nil {
-			logf("\n%v\n\n", n)
+			logf("%v\n\n", n)
 			notifies.put(n)
 		} else {
-			logf("\n(ignored) %v\n\n", n)
+			logf("(ignored) %v\n\n", n)
 		}
 	})
 
@@ -583,12 +578,12 @@ func TestStateMachine(t *testing.T) {
 
 	// User wants to logout.
 	store.awaitWrite()
-	t.Logf("\n\nLogout (async)")
+	t.Logf("\n\nLogout")
 	notifies.expect(2)
-	b.Logout()
+	b.LogoutSync(context.Background())
 	{
 		nn := notifies.drain(2)
-		cc.assertCalls("pause", "StartLogout")
+		cc.assertCalls("pause", "Logout")
 		c.Assert(nn[0].State, qt.IsNotNil)
 		c.Assert(nn[1].Prefs, qt.IsNotNil)
 		c.Assert(ipn.Stopped, qt.Equals, *nn[0].State)
@@ -599,7 +594,7 @@ func TestStateMachine(t *testing.T) {
 	}
 
 	// Let's make the logout succeed.
-	t.Logf("\n\nLogout (async) - succeed")
+	t.Logf("\n\nLogout - succeed")
 	notifies.expect(3)
 	cc.send(nil, "", false, nil)
 	{
@@ -617,15 +612,15 @@ func TestStateMachine(t *testing.T) {
 	}
 
 	// A second logout should reset all prefs.
-	t.Logf("\n\nLogout2 (async)")
+	t.Logf("\n\nLogout2")
 	notifies.expect(1)
-	b.Logout()
+	b.LogoutSync(context.Background())
 	{
 		nn := notifies.drain(1)
 		c.Assert(nn[0].Prefs, qt.IsNotNil) // emptyPrefs
 		// BUG: the backend has already called StartLogout, and we're
 		// still logged out. So it shouldn't call it again.
-		cc.assertCalls("StartLogout")
+		cc.assertCalls("Logout")
 		cc.assertCalls()
 		c.Assert(b.Prefs().LoggedOut(), qt.IsTrue)
 		c.Assert(b.Prefs().WantRunning(), qt.IsFalse)
@@ -645,7 +640,7 @@ func TestStateMachine(t *testing.T) {
 	}
 
 	// Try the synchronous logout feature.
-	t.Logf("\n\nLogout3 (sync)")
+	t.Logf("\n\nLogout (sync)")
 	notifies.expect(0)
 	b.LogoutSync(context.Background())
 	// NOTE: This returns as soon as cc.Logout() returns, which is okay