fix crash in hue2 driver.

internal/drivers/hue2/bridge.go

@@ -252,6 +252,9 @@ func (b *Bridge) MakeCongruent(ctx context.Context) (int, error) {
 	updates := make(map[string]ResourceUpdate)
 	for _, device := range b.devices {
 		resource := b.resources[device.InternalID]
+		if resource == nil {
+			continue
+		}
 
 		// Update device
 		if resource.Metadata.Name != device.Name {
@@ -619,3 +622,18 @@ func (b *Bridge) SearchDevices(ctx context.Context, timeout time.Duration) ([]mo
 	// Return said devices.
 	return newDevices, nil
 }
+
+func (b *Bridge) Forget(ctx context.Context, device models.Device) error {
+	b.mu.Lock()
+	resource := b.resources[device.InternalID]
+	b.mu.Unlock()
+
+	if resource == nil {
+		return errors.New("resource not found")
+	}
+
+	return b.client.DeleteResource(ctx, ResourceLink{
+		ID:   device.InternalID,
+		Kind: "device",
+	})
+}

internal/drivers/hue2/client.go

@@ -92,6 +92,10 @@ func (c *Client) UpdateResource(ctx context.Context, link ResourceLink, update R
 	return c.put(ctx, link.Path(), update, nil)
 }
 
+func (c *Client) DeleteResource(ctx context.Context, link ResourceLink) error {
+	return c.delete(ctx, link.Path(), nil)
+}
+
 func (c *Client) LegacyDiscover(ctx context.Context, kind string) error {
 	return c.legacyPost(ctx, kind, nil, nil)
 }
@@ -268,6 +272,36 @@ func (c *Client) post(ctx context.Context, path string, body interface{}, target
 	return json.NewDecoder(res.Body).Decode(&target)
 }
 
+func (c *Client) delete(ctx context.Context, path string, target interface{}) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-c.ch:
+		defer func() {
+			c.ch <- struct{}{}
+		}()
+	}
+
+	req, err := http.NewRequest("PUT", fmt.Sprintf("https://%s/%s", c.host, path), nil)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("hue-application-key", c.token)
+
+	res, err := httpClient.Do(req.WithContext(ctx))
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	if target == nil {
+		return nil
+	}
+
+	return json.NewDecoder(res.Body).Decode(&target)
+}
+
 func (c *Client) legacyPost(ctx context.Context, resource string, body interface{}, target interface{}) error {
 	select {
 	case <-ctx.Done():
@@ -305,6 +339,38 @@ func (c *Client) legacyPost(ctx context.Context, resource string, body interface
 	return json.NewDecoder(res.Body).Decode(target)
 }
 
+func (c *Client) legacyDelete(ctx context.Context, resource string, target interface{}) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-c.ch:
+		defer func() {
+			c.ch <- struct{}{}
+		}()
+	}
+
+	if c.token != "" {
+		resource = c.token + "/" + resource
+	}
+
+	req, err := http.NewRequest("DELETE", fmt.Sprintf("http://%s/api/%s", c.host, resource), nil)
+	if err != nil {
+		return err
+	}
+
+	res, err := httpClient.Do(req.WithContext(ctx))
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	if target == nil {
+		return nil
+	}
+
+	return json.NewDecoder(res.Body).Decode(target)
+}
+
 func reqBody(body interface{}) (io.Reader, error) {
 	if body == nil {
 		return nil, nil

internal/drivers/hue2/driver.go

@@ -100,6 +100,10 @@ func (d *Driver) Run(ctx context.Context, bridge models.Bridge, ch chan<- models
 	return d.ensureBridge(bridge).Run(ctx, ch)
 }
 
+func (d *Driver) ForgetDevice(ctx context.Context, bridge models.Bridge, device models.Device) error {
+	return d.ensureBridge(bridge).Forget(ctx, device)
+}
+
 func (d *Driver) ensureBridge(info models.Bridge) *Bridge {
 	d.mu.Lock()
 	for _, bridge := range d.bridges {