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controller.go
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controller.go
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package controller
// https://www.w3.org/TR/speech-synthesis/
import (
"context"
"fmt"
"net/url"
"strconv"
"github.com/barnybug/go-cast"
"github.com/barnybug/go-cast/controllers"
"github.com/barnybug/go-cast/events"
"github.com/bookerzzz/grok"
"github.com/pkg/errors"
"go.uber.org/zap"
)
const (
ttsURL = "https://translate.google.com/translate_tts?ie=UTF-8&q=%s&tl=%s&client=tw-ob"
)
//-----------------------------------------------------------------------------
// Controller
//-----------------------------------------------------------------------------
// Controller interface
type Controller interface {
Speak(text string, language string) error
Play(url string) error
Stop() error
GetStatus() (*controllers.MediaStatusResponse, error)
SetVolume(vol string) error
Close()
CloseEvent()
RunEventReceiver(notify chan struct{})
DebugStatus(status *controllers.MediaStatusResponse)
}
// controller controls google home by cast.Client
type controller struct {
ctx context.Context
client *cast.Client
logger *zap.Logger
}
// NewController returns Controller
func NewController(
ctx context.Context,
client *cast.Client,
logger *zap.Logger,
) Controller {
return &controller{
ctx: ctx,
client: client,
logger: logger,
}
}
// Speak speaks text content
func (c *controller) Speak(text string, language string) error {
playURL := fmt.Sprintf(ttsURL, url.QueryEscape(text), url.QueryEscape(language))
c.logger.Debug("speak", zap.String("playURL", playURL))
return c.Play(playURL)
}
// Play plays music of URL
func (c *controller) Play(playURL string) error {
media, err := c.client.Media(c.ctx)
if err != nil {
return errors.Wrap(err, "fail to call cast.Client.Media()")
}
mediaItem := controllers.MediaItem{
ContentId: playURL,
StreamType: "BUFFERED",
ContentType: "audio/mpeg",
}
customData := map[string]interface{}{}
_, err = media.LoadMedia(c.ctx, mediaItem, 0, true, customData)
return err
}
// Stop stops playing music
func (c *controller) Stop() error {
if !c.client.IsPlaying(c.ctx) {
return nil
}
media, err := c.client.Media(c.ctx)
if err != nil {
return errors.Wrap(err, "fail to call cast.Client.Media()")
}
_, err = media.Stop(c.ctx)
return err
}
// GetStatus returns media status
func (c *controller) GetStatus() (*controllers.MediaStatusResponse, error) {
media, err := c.client.Media(c.ctx)
if err != nil {
return nil, errors.Wrap(err, "fail to call cast.Client.Media()")
}
//*MediaStatusResponse, error
return media.GetStatus(c.ctx)
}
// SetVolume sets volume
func (c *controller) SetVolume(vol string) error {
receiver := c.client.Receiver()
level, _ := strconv.ParseFloat(vol, 64)
muted := false
volume := controllers.Volume{
Level: &level,
Muted: &muted,
}
_, err := receiver.SetVolume(c.ctx, &volume)
if err != nil {
return errors.Wrap(err, "fail to call cast.Client.Receiver.SetVolume()")
}
return nil
}
// Close closes google cast client
func (c *controller) Close() {
c.client.Close()
}
// CloseEvent closes google cast client Events channel
func (c *controller) CloseEvent() {
close(c.client.Events)
}
// RunEventReceiver runs event receiver of client status
func (c *controller) RunEventReceiver(notify chan struct{}) {
go func() {
for evt := range c.client.Events {
// evt is type of interface, it should be asserted
c.logger.Info("event_received",
zap.Any("events.Event", evt),
)
switch evtType := evt.(type) {
case controllers.MediaStatus:
c.logger.Debug("controllers.MediaStatus",
zap.String("evtType.PlayerState", evtType.PlayerState),
zap.String("evtType.IdleReason", evtType.IdleReason),
)
if evtType.IdleReason == "FINISHED" {
c.logger.Debug("controllers.MediaStatus: FINISHED")
if notify != nil {
close(notify)
}
}
case events.AppStarted:
c.logger.Debug("evtType: AppStarted")
case events.AppStopped:
c.logger.Debug("evtType: AppStopped")
case events.Connected:
c.logger.Debug("evtType: Connected")
case events.Disconnected:
c.logger.Debug("evtType: Disconnected")
case events.StatusUpdated:
c.logger.Debug("evtType: StatusUpdated")
default:
c.logger.Debug("evtType: default")
grok.Value(evt)
}
}
}()
}
// DebugStatus dumps *controllers.MediaStatusResponse
func (c *controller) DebugStatus(status *controllers.MediaStatusResponse) {
c.logger.Debug("DebugStatus(): *ctl.MediaStatusResponse:status")
grok.Value(status)
}