schnutibox/pkg/mpc/mpc.go
Marvin Preuss 40071a52f9
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continuous-integration/drone/push Build is passing
PlaylistURIS uses established mpd connection
2021-08-25 09:45:51 +02:00

139 lines
2.5 KiB
Go

package mpc
import (
"errors"
"fmt"
"time"
"github.com/fhs/gompd/v2/mpd"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"go.xsfx.dev/schnutibox/internal/config"
"go.xsfx.dev/schnutibox/internal/metrics"
)
const (
timeout = 5 * time.Second
timeoutWait = time.Second / 2
)
var errTimeout = errors.New("timeout")
func Conn() (*mpd.Client, error) {
t := time.NewTimer(timeout)
for {
select {
case <-t.C:
return nil, errTimeout
default:
c, err := mpd.Dial("tcp", fmt.Sprintf("%s:%d", config.Cfg.MPD.Hostname, config.Cfg.MPD.Port))
if err != nil {
log.Error().Err(err).Msg("could not connect")
time.Sleep(timeoutWait)
continue
}
if !t.Stop() {
go func() {
<-t.C
}()
}
return c, nil
}
}
}
// PlaylistURIS extracts uris from MPD playlist.
func PlaylistURIS(m *mpd.Client) ([]string, error) {
attrs, err := m.PlaylistInfo(-1, -1)
if err != nil {
return nil, fmt.Errorf("could not get playlist: %w", err)
}
// Stores the tracklist it got from the MPD server.
uris := []string{}
// Builds uri list.
for _, a := range attrs {
uris = append(uris, a["file"])
}
return uris, nil
}
func Stop(logger zerolog.Logger) error {
logger.Info().Msg("trying to stop playback")
m, err := Conn()
if err != nil {
return fmt.Errorf("could not connect: %w", err)
}
// nolint:wrapcheck
return m.Stop()
}
func Clear(logger zerolog.Logger) error {
logger.Info().Msg("trying to clear playlist")
m, err := Conn()
if err != nil {
return fmt.Errorf("could not connect: %w", err)
}
// nolint:wrapcheck
return m.Clear()
}
func Play(logger zerolog.Logger, rfid string, name string, uris []string) error {
logger.Info().Msg("trying to add tracks")
m, err := Conn()
if err != nil {
return fmt.Errorf("could not connect: %w", err)
}
// Stop playing track.
if err := Stop(logger); err != nil {
metrics.BoxErrors.Inc()
return err
}
// Clear playlist.
if err := Clear(logger); err != nil {
metrics.BoxErrors.Inc()
return err
}
// Adding every single uri to playlist
for _, i := range uris {
logger.Debug().Str("uri", i).Msg("add track")
if err := m.Add(i); err != nil {
metrics.BoxErrors.Inc()
return fmt.Errorf("could not add track: %w", err)
}
}
// Getting playlist uris from MPD server.
// This is needed to identify the right metric to use.
mpdURIS, err := PlaylistURIS(m)
if err != nil {
metrics.BoxErrors.Inc()
return err
}
metrics.NewPlay(rfid, name, mpdURIS)
// nolint:wrapcheck
return m.Play(-1)
}