Merge pull request #855 from Inrego/nest-extend-stream

Nest extend stream

README.md

@@ -579,7 +579,7 @@ streams:
 
 Any cameras in WebRTC format are supported. But at the moment Home Assistant only supports some [Nest](https://www.home-assistant.io/integrations/nest/) cameras in this fomat.
 
-The Nest API only allows you to get a link to a stream for 5 minutes. So every 5 minutes the stream will be reconnected.
+**Important.** The Nest API only allows you to get a link to a stream for 5 minutes. Do not use this with Frigate! If the stream expires, Frigate will consume all available ram on your machine within seconds. It's recommended to use [Nest source](#source-nest) - it supports extending the stream.
 
 ```yaml
 streams:
@@ -610,7 +610,7 @@ streams:
 
 *[New in v1.6.0](https://github.com/AlexxIT/go2rtc/releases/tag/v1.6.0)*
 
-Currently only WebRTC cameras are supported. Stream reconnects every 5 minutes.
+Currently only WebRTC cameras are supported.
 
 For simplicity, it is recommended to connect the Nest/WebRTC camera to the [Home Assistant](#source-hass). But if you can somehow get the below parameters - Nest/WebRTC source will work without Hass.
 

pkg/nest/api.go

@@ -14,6 +14,13 @@ import (
 type API struct {
 	Token     string
 	ExpiresAt time.Time
+
+	StreamProjectID string
+	StreamDeviceID  string
+	StreamSessionID string
+	StreamExpiresAt time.Time
+
+	extendTimer *time.Timer
 }
 
 type Auth struct {
@@ -159,17 +166,73 @@ func (a *API) ExchangeSDP(projectID, deviceID, offer string) (string, error) {
 		Results struct {
 			Answer         string    `json:"answerSdp"`
 			ExpiresAt      time.Time `json:"expiresAt"`
-			MediaSessionId string    `json:"mediaSessionId"`
+			MediaSessionID string    `json:"mediaSessionId"`
 		} `json:"results"`
 	}
 
 	if err = json.NewDecoder(res.Body).Decode(&resv); err != nil {
 		return "", err
 	}
 
+	a.StreamProjectID = projectID
+	a.StreamDeviceID = deviceID
+	a.StreamSessionID = resv.Results.MediaSessionID
+	a.StreamExpiresAt = resv.Results.ExpiresAt
+
 	return resv.Results.Answer, nil
 }
 
+func (a *API) ExtendStream() error {
+	var reqv struct {
+		Command string `json:"command"`
+		Params  struct {
+			MediaSessionID string `json:"mediaSessionId"`
+		} `json:"params"`
+	}
+	reqv.Command = "sdm.devices.commands.CameraLiveStream.ExtendWebRtcStream"
+	reqv.Params.MediaSessionID = a.StreamSessionID
+
+	b, err := json.Marshal(reqv)
+	if err != nil {
+		return err
+	}
+
+	uri := "https://smartdevicemanagement.googleapis.com/v1/enterprises/" +
+		a.StreamProjectID + "/devices/" + a.StreamDeviceID + ":executeCommand"
+	req, err := http.NewRequest("POST", uri, bytes.NewReader(b))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Authorization", "Bearer "+a.Token)
+
+	client := &http.Client{Timeout: time.Second * 5000}
+	res, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	if res.StatusCode != 200 {
+		return errors.New("nest: wrong status: " + res.Status)
+	}
+
+	var resv struct {
+		Results struct {
+			ExpiresAt      time.Time `json:"expiresAt"`
+			MediaSessionID string    `json:"mediaSessionId"`
+		} `json:"results"`
+	}
+
+	if err = json.NewDecoder(res.Body).Decode(&resv); err != nil {
+		return err
+	}
+
+	a.StreamSessionID = resv.Results.MediaSessionID
+	a.StreamExpiresAt = resv.Results.ExpiresAt
+
+	return nil
+}
+
 type Device struct {
 	Name string `json:"name"`
 	Type string `json:"type"`
@@ -203,3 +266,20 @@ type Device struct {
 	//	DisplayName string `json:"displayName"`
 	//} `json:"parentRelations"`
 }
+
+func (a *API) StartExtendStreamTimer() {
+	// Calculate the duration until 30 seconds before the stream expires
+	duration := time.Until(a.StreamExpiresAt.Add(-30 * time.Second))
+	a.extendTimer = time.AfterFunc(duration, func() {
+		if err := a.ExtendStream(); err != nil {
+			return
+		}
+		duration = time.Until(a.StreamExpiresAt.Add(-30 * time.Second))
+		a.extendTimer.Reset(duration)
+	})
+
+}
+
+func (a *API) StopExtendStreamTimer() {
+	a.extendTimer.Stop()
+}

pkg/nest/client.go

@@ -11,6 +11,7 @@ import (
 
 type Client struct {
 	conn *webrtc.Conn
+	api  *API
 }
 
 func NewClient(rawURL string) (*Client, error) {
@@ -74,7 +75,7 @@ func NewClient(rawURL string) (*Client, error) {
 		return nil, err
 	}
 
-	return &Client{conn: conn}, nil
+	return &Client{conn: conn, api: nestAPI}, nil
 }
 
 func (c *Client) GetMedias() []*core.Media {
@@ -90,10 +91,12 @@ func (c *Client) AddTrack(media *core.Media, codec *core.Codec, track *core.Rece
 }
 
 func (c *Client) Start() error {
+	c.api.StartExtendStreamTimer()
 	return c.conn.Start()
 }
 
 func (c *Client) Stop() error {
+	c.api.StopExtendStreamTimer()
 	return c.conn.Stop()
 }