/
playback.go
320 lines (277 loc) · 7.33 KB
/
playback.go
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package controllers
import (
"database/sql"
"encoding/json"
"net/http"
"strconv"
"time"
e "github.com/chances/party-server/errors"
"github.com/chances/party-server/events"
"github.com/chances/party-server/models"
"github.com/chances/party-server/session"
"github.com/gin-gonic/gin"
"github.com/vattle/sqlboiler/types"
)
// Playback controller
type Playback struct {
Controller
}
// NewPlayback creates a new Playback controller
func NewPlayback() Playback {
newPlayback := Playback{}
newPlayback.Setup()
return newPlayback
}
// Play the party's playlist or resume from paused state
func (cr *Playback) Play() gin.HandlerFunc {
return func(c *gin.Context) {
currentParty, err := session.CurrentParty(c)
if err != nil {
if err != sql.ErrNoRows {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
c.Error(e.NotFound.WithMessage("Host has not started a party"))
c.Abort()
return
}
var currentTrack models.PlayingTrack
if !currentParty.CurrentTrack.Valid {
// Begin playing the party's queue
shuffleParam := c.Query("shuffle")
shuffle := shuffleParam != "" && shuffleParam != "no" && shuffleParam != "0"
queue, err := currentParty.QueueTracks()
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
// Shuffle the queue if requested
if shuffle {
queue = models.Shuffle(queue)
}
track, err := cr.popTrackAndPlay(queue, currentParty.QueueID, currentParty.RoomCode)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
currentTrack = *track
} else {
// Resume the current track
err = currentParty.CurrentTrack.Unmarshal(currentTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
// It is a bad request to resume a track that is already playing
if !currentTrack.Paused {
c.Error(e.BadRequest.WithDetail("Current track is not paused"))
c.Abort()
return
}
currentTrack.BeganPlaying = time.Now().UTC().Add(
time.Duration(currentTrack.Elapsed) * time.Second * -1,
)
}
currentTrack.Paused = false
err = cr.updateTrackAndBroadcast(currentParty, ¤tTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
c.JSON(http.StatusOK, models.EmptyRespose)
}
}
// Pause the party's playlist from playing
func (cr *Playback) Pause() gin.HandlerFunc {
return func(c *gin.Context) {
currentParty, err := session.CurrentParty(c)
if err != nil {
if err != sql.ErrNoRows {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
c.Error(e.NotFound.WithMessage("Host has not started a party"))
c.Abort()
return
}
// It is a bad request to pause when no track is playing
if !currentParty.CurrentTrack.Valid {
c.Error(e.BadRequest.WithDetail("Host is not playing music"))
c.Abort()
return
}
// Pause the current track
var currentTrack models.PlayingTrack
err = currentParty.CurrentTrack.Unmarshal(currentTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
elapsedParam, exists := c.GetQuery("elapsed")
if !exists {
c.Error(e.BadRequest.WithDetail("Must provide elapsed duration to pause playback"))
c.Abort()
return
}
elapsed, err := strconv.ParseUint(elapsedParam, 10, 64)
if err != nil {
c.Error(
e.BadRequest.
WithDetail("Must provide valid elapsed duration to pause playback").
CausedBy(err),
)
c.Abort()
return
}
// It is a bad request to pause a track that is already paused
if currentTrack.Paused {
c.Error(e.BadRequest.WithDetail("Current track is already paused"))
c.Abort()
return
}
currentTrack.Paused = true
currentTrack.Elapsed = uint(elapsed)
err = cr.updateTrackAndBroadcast(currentParty, ¤tTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
c.JSON(http.StatusOK, models.EmptyRespose)
}
}
// Skip they party's current track
func (cr *Playback) Skip() gin.HandlerFunc {
return func(c *gin.Context) {
currentParty, err := session.CurrentParty(c)
if err != nil {
if err != sql.ErrNoRows {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
c.Error(e.NotFound.WithMessage("Host has not started a party"))
c.Abort()
return
}
// It is a bad request to skip when no track is playing
if !currentParty.CurrentTrack.Valid {
c.Error(e.BadRequest.WithDetail("Host is not playing music"))
c.Abort()
return
}
var currentTrack models.PlayingTrack
err = currentParty.CurrentTrack.Unmarshal(currentTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
lastTrack := currentTrack.Track
// Pop next track from party's queue
queue, err := currentParty.QueueTracks()
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
newTrack, err := cr.popTrackAndPlay(queue, currentParty.QueueID, currentParty.RoomCode)
if err != nil {
c.Error(e.Internal.WithDetail("Could not pop track from queue").CausedBy(err))
c.Abort()
return
}
err = cr.updateTrackAndBroadcast(currentParty, newTrack)
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
// Push last track to party's history
history, err := currentParty.HistoryTracks()
if err != nil {
c.Error(e.Internal.CausedBy(err))
c.Abort()
return
}
err = cr.pushTrack(history, currentParty.HistoryID, &lastTrack, currentParty.RoomCode)
if err != nil {
c.Error(e.Internal.WithDetail("Could not push track to history").CausedBy(err))
c.Abort()
return
}
c.JSON(http.StatusOK, models.EmptyRespose)
}
}
func (cr *Playback) popTrackAndPlay(queue *[]models.Track, queueID int, partyCode string) (*models.PlayingTrack, error) {
// Pop first track from top of queue
firstTrack := (*queue)[0]
copy(*queue, (*queue)[1:])
updatedQueue := (*queue)[:len(*queue)-1]
// Update the queue
queueJSONRaw, err := json.Marshal(updatedQueue)
if err != nil {
return nil, err
}
queueJSON := types.JSON(queueJSONRaw)
queueTrackList := models.TrackList{
ID: queueID,
Data: queueJSON,
}
err = queueTrackList.UpdateG()
if err != nil {
return nil, err
}
events.UpdateQueue(&updatedQueue, partyCode)
// "Play" the track
currentTrack := models.PlayingTrack{
Track: firstTrack,
Paused: false,
Elapsed: 0,
}
currentTrack.BeganPlaying = time.Now().UTC()
return ¤tTrack, nil
}
func (cr *Playback) pushTrack(history *[]models.Track, historyID int, track *models.Track, partyCode string) error {
// Push track to top of history stack
updatedHistory := append([]models.Track{*track}, *history...)
historyJSONRaw, err := json.Marshal(updatedHistory)
if err != nil {
return err
}
historyJSON := types.JSON(historyJSONRaw)
historyTrackList := models.TrackList{
ID: historyID,
Data: historyJSON,
}
err = historyTrackList.UpdateG()
if err != nil {
return err
}
events.UpdateHistory(&updatedHistory, partyCode)
return nil
}
func (cr *Playback) updateTrackAndBroadcast(party *models.Party, track *models.PlayingTrack) error {
err := party.CurrentTrack.Marshal(track)
if err != nil {
return err
}
err = party.UpdateG("current_track")
if err != nil {
return err
}
// Broadcast to clients that the party's current track has changed
publicParty, err := party.Public()
if err != nil {
return err
}
go events.UpdateParty(publicParty)
return nil
}