Support info (device name and other meta-information) in the status. (#…

…202)

* Support info (device name and other meta-information) in the status.

Examplar result:
```
% curl "http://0.0.0.0:8011/status?uuid=edfaf976-0411-41c4-9e5a-724c8781f0bc" | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   610  100   610    0     0    288      0  0:00:02  0:00:02 --:--:--   288
{
  "info": {
    "name": "Sisters Room speaker",
    "ip_address": "192.168.0.161",
    "locale": "pl",
    "mac_address": "54:60:09:D0:10:A4",
    "ssid": "Szum",
    "timezone": "Europe/Warsaw",
    "uptime": 45394.987882
  },
  "app_id": "",
  "display_name": "",
  "is_idle_screen": false,
  "status_text": "",
  "player_state": "",
  "current_time": 0,
  "idle_reason": "",
  "current_item_id": 0,
  "loading_item_id": 0,
  "content_id": "",
  "content_type": "",
  "stream_type": "",
  "duration": 0,
  "artist": "",
  "title": "",
  "subtitle": "",
  "volume_level": 0.89,
  "volume_muted": false,
  "media_volume_level": 0,
  "media_volume_muted": false,
  "session_id": "",
  "transport_id": "",
  "media_session_id": 0,
  "player_state_id": 0
}
```

* Regenerate mocks.

* Fixed error support.

* Support for cast groups.

* Delete info.

* Cache info.

* Cleanup.

application/application.go

@@ -20,7 +20,6 @@ import (
 
 	"github.com/buger/jsonparser"
 	"github.com/pkg/errors"
-
 	"github.com/vishen/go-chromecast/cast"
 	pb "github.com/vishen/go-chromecast/cast/proto"
 	"github.com/vishen/go-chromecast/playlists"
@@ -66,6 +65,7 @@ type App interface {
 	Close(stopMedia bool) error
 	LoadApp(appID, contentID string) error
 	Status() (*cast.Application, *cast.Media, *cast.Volume)
+	Info() (*cast.DeviceInfo, error)
 	Update() error
 	Pause() error
 	Unpause() error
@@ -93,6 +93,9 @@ type Application struct {
 	conn  cast.Conn
 	debug bool
 
+	// Device name override (originating e.g. from mdns lookup).
+	deviceNameOverride string
+
 	// Internal mapping of request id to result channel
 	resultChanMap map[int]chan *pb.CastMessage
 
@@ -107,6 +110,7 @@ type Application struct {
 	// Current values from the chromecast.
 	application *cast.Application // It is possible that there is no current application, can happen for google home.
 	media       *cast.Media
+	info        *cast.DeviceInfo
 	// There seems to be two different volumes returned from the chromecast,
 	// one for the receiver and one for the playing media. It looks we update
 	// the receiver volume from go-chromecast, so we should use that one. But
@@ -187,6 +191,12 @@ func WithSkipadRetries(retries int) ApplicationOption {
 	}
 }
 
+func WithDeviceNameOverride(deviceName string) ApplicationOption {
+	return func(a *Application) {
+		a.SetDeviceNameOverride(deviceName)
+	}
+}
+
 func NewApplication(opts ...ApplicationOption) *Application {
 	a := &Application{
 		conn:              cast.NewConnection(),
@@ -223,6 +233,10 @@ func (a *Application) SetIface(iface *net.Interface)       { a.iface = iface }
 func (a *Application) SetSkipadSleep(sleep time.Duration) { a.skipadSleep = sleep }
 func (a *Application) SetSkipadRetries(retries int)       { a.skipadRetries = retries }
 
+func (a *Application) SetDeviceNameOverride(deviceName string) {
+	a.deviceNameOverride = deviceName
+}
+
 func (a *Application) App() *cast.Application { return a.application }
 func (a *Application) Media() *cast.Media     { return a.media }
 func (a *Application) Volume() *cast.Volume   { return a.volumeReceiver }
@@ -437,6 +451,25 @@ func (a *Application) Status() (*cast.Application, *cast.Media, *cast.Volume) {
 	return a.application, a.media, a.volumeReceiver
 }
 
+func (a *Application) Info() (*cast.DeviceInfo, error) {
+	if a.info != nil {
+		return a.info, nil
+	}
+	addr, err := a.conn.RemoteAddr()
+	if err != nil {
+		return nil, err
+	}
+	info, err := GetInfo(addr)
+	if err != nil {
+		return nil, err
+	}
+	if len(a.deviceNameOverride) > 0 {
+		info.Name = a.deviceNameOverride
+	}
+	a.info = info
+	return info, err
+}
+
 func (a *Application) Pause() error {
 	if a.media == nil {
 		return ErrNoMediaPause

application/info.go

@@ -0,0 +1,35 @@
+package application
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/vishen/go-chromecast/cast"
+)
+
+// getInfo uses the http://<ip>:8008/setup/eureka_endpoint to obtain more
+// information about the cast-device.
+// OBS: The 8008 seems to be pure http, whereas 8009 is typically the port
+// to use for protobuf-communication,
+
+func GetInfo(ip string) (info *cast.DeviceInfo, err error) {
+	// Note: Services exposed not on 8009 port are "Google Cast Group"s
+	// The only way to find the true device (group) name, is using mDNS outside of this function.
+	url := fmt.Sprintf("http://%v:8008/setup/eureka_info", ip)
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	info = new(cast.DeviceInfo)
+	if err := json.Unmarshal(data, info); err != nil {
+		return nil, err
+	}
+	return info, nil
+}