Tibber Pulse: fix server going silent (evcc-io#7575)

meter/tibber-pulse.go

@@ -20,13 +20,14 @@ func init() {
 	registry.Add("tibber-pulse", NewTibberFromConfig)
 }
 
-var timeout = time.Minute
-
 type Tibber struct {
-	mu      sync.Mutex
-	log     *util.Logger
-	updated time.Time
-	live    tibber.LiveMeasurement
+	mu            sync.Mutex
+	log           *util.Logger
+	updated       time.Time
+	live          tibber.LiveMeasurement
+	url           string
+	token, homeID string
+	client        *graphql.SubscriptionClient
 }
 
 func NewTibberFromConfig(other map[string]interface{}) (api.Meter, error) {
@@ -43,12 +44,10 @@ func NewTibberFromConfig(other map[string]interface{}) (api.Meter, error) {
 		return nil, errors.New("missing token")
 	}
 
-	t := &Tibber{
-		log: util.NewLogger("pulse").Redact(cc.Token, cc.HomeID),
-	}
+	log := util.NewLogger("pulse").Redact(cc.Token, cc.HomeID)
 
 	// query client
-	qclient := tibber.NewClient(t.log, cc.Token)
+	qclient := tibber.NewClient(log, cc.Token)
 
 	if cc.HomeID == "" {
 		home, err := qclient.DefaultHome("")
@@ -71,8 +70,22 @@ func NewTibberFromConfig(other map[string]interface{}) (api.Meter, error) {
 		return nil, err
 	}
 
-	// subscription client
-	client := graphql.NewSubscriptionClient(res.Viewer.WebsocketSubscriptionUrl).
+	t := &Tibber{
+		log:    log,
+		url:    res.Viewer.WebsocketSubscriptionUrl,
+		token:  cc.Token,
+		homeID: cc.HomeID,
+	}
+
+	// run the client
+	err := t.reconnect()
+
+	return t, err
+}
+
+// newSubscriptionClient creates graphql subscription client
+func (t *Tibber) newSubscriptionClient() {
+	t.client = graphql.NewSubscriptionClient(t.url).
 		WithProtocol(graphql.GraphQLWS).
 		WithWebSocketOptions(graphql.WebsocketOptions{
 			HTTPClient: &http.Client{
@@ -85,29 +98,22 @@ func NewTibberFromConfig(other map[string]interface{}) (api.Meter, error) {
 			},
 		}).
 		WithConnectionParams(map[string]any{
-			"token": cc.Token,
+			"token": t.token,
 		}).
 		WithRetryTimeout(0).
 		WithLog(t.log.TRACE.Println)
-
-	// run the client
-	done := make(chan error)
-	go t.subscribe(client, cc.HomeID, done)
-	err := <-done
-
-	return t, err
 }
 
-// subscribe to the websocket query
-func (t *Tibber) subscribe(client *graphql.SubscriptionClient, homeID string, done chan error) {
-	var query struct {
-		tibber.LiveMeasurement `graphql:"liveMeasurement(homeId: $homeId)"`
-	}
-
-	var once sync.Once
+func (t *Tibber) subscribe(done chan error) {
+	var (
+		once  sync.Once
+		query struct {
+			tibber.LiveMeasurement `graphql:"liveMeasurement(homeId: $homeId)"`
+		}
+	)
 
-	_, err := client.Subscribe(&query, map[string]any{
-		"homeId": graphql.ID(homeID),
+	_, err := t.client.Subscribe(&query, map[string]any{
+		"homeId": graphql.ID(t.homeID),
 	}, func(data []byte, err error) error {
 		if err != nil {
 			once.Do(func() { done <- err })
@@ -133,40 +139,60 @@ func (t *Tibber) subscribe(client *graphql.SubscriptionClient, homeID string, do
 
 		return nil
 	})
-
 	if err != nil {
 		once.Do(func() { done <- err })
 	}
 
 	go func() {
-		if err := client.Run(); err != nil {
+		if err := t.client.Run(); err != nil {
 			once.Do(func() { done <- err })
 		}
 	}()
 }
 
-// CurrentPower implements the api.Meter interface
-func (t *Tibber) CurrentPower() (float64, error) {
+func (t *Tibber) reconnect() error {
+	const timeout = time.Minute
+
 	t.mu.Lock()
-	defer t.mu.Unlock()
+	if time.Since(t.updated) <= timeout {
+		t.mu.Unlock()
+		return nil
+	}
+	t.mu.Unlock()
 
-	if time.Since(t.updated) > timeout {
-		return 0, api.ErrTimeout
+	if t.client != nil {
+		if err := t.client.Close(); err != nil {
+			t.log.DEBUG.Println("close:", err)
+		}
 	}
 
+	t.newSubscriptionClient()
+
+	done := make(chan error)
+	go t.subscribe(done)
+
+	return <-done
+}
+
+func (t *Tibber) CurrentPower() (float64, error) {
+	if err := t.reconnect(); err != nil {
+		return 0, err
+	}
+
+	t.mu.Lock()
+	defer t.mu.Unlock()
 	return t.live.Power - t.live.PowerProduction, nil
 }
 
 var _ api.PhaseCurrents = (*Tibber)(nil)
 
 // Currents implements the api.PhaseCurrents interface
 func (t *Tibber) Currents() (float64, float64, float64, error) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if time.Since(t.updated) > timeout {
-		return 0, 0, 0, api.ErrTimeout
+	if err := t.reconnect(); err != nil {
+		return 0, 0, 0, err
 	}
 
+	t.mu.Lock()
+	defer t.mu.Unlock()
 	return t.live.CurrentL1, t.live.CurrentL2, t.live.CurrentL3, nil
 }