wip

engine/handlers/lbz_submit_listen.go

@@ -211,10 +211,8 @@ func LbzSubmitListenHandler(store db.DB, mbzc mbz.MusicBrainzCaller) func(w http
 				Time:               listenedAt,
 				UserID:             u.ID,
 				Client:             client,
-			}
-
-			if req.ListenType == ListenTypePlayingNow {
-				opts.SkipSaveListen = true
+				IsNowPlaying:       req.ListenType == ListenTypePlayingNow,
+				SkipSaveListen:     req.ListenType == ListenTypePlayingNow,
 			}
 
 			_, err, shared := sfGroup.Do(buildCaolescingKey(payload), func() (interface{}, error) {

engine/handlers/now_playing.go

@@ -0,0 +1,41 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gabehf/koito/internal/db"
+	"github.com/gabehf/koito/internal/logger"
+	"github.com/gabehf/koito/internal/memkv"
+	"github.com/gabehf/koito/internal/models"
+	"github.com/gabehf/koito/internal/utils"
+)
+
+type NowPlayingResponse struct {
+	CurrentlyPlaying bool         `json:"currently_playing"`
+	Track            models.Track `json:"track"`
+}
+
+func NowPlayingHandler(store db.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		l := logger.FromContext(ctx)
+
+		l.Debug().Msg("NowPlayingHandler: Got request")
+
+		// Hardcoded user id as 1. Not great but it works until (if) multi-user is supported.
+		if trackIdI, ok := memkv.Store.Get("1"); !ok {
+			utils.WriteJSON(w, http.StatusOK, NowPlayingResponse{CurrentlyPlaying: false})
+		} else if trackId, ok := trackIdI.(int32); !ok {
+			l.Debug().Msg("NowPlayingHandler: Failed type assertion for trackIdI")
+			utils.WriteError(w, "internal server error", http.StatusInternalServerError)
+		} else {
+			track, err := store.GetTrack(ctx, db.GetTrackOpts{ID: trackId})
+			if err != nil {
+				l.Error().Err(err).Msg("NowPlayingHandler: Failed to get track from database")
+				utils.WriteError(w, "failed to fetch currently playing track from database", http.StatusInternalServerError)
+			} else {
+				utils.WriteJSON(w, http.StatusOK, NowPlayingResponse{CurrentlyPlaying: true, Track: *track})
+			}
+		}
+	}
+}

engine/routes.go

@@ -45,6 +45,7 @@ func bindRoutes(
 		r.Get("/top-artists", handlers.GetTopArtistsHandler(db))
 		r.Get("/listens", handlers.GetListensHandler(db))
 		r.Get("/listen-activity", handlers.GetListenActivityHandler(db))
+		r.Get("/now-playing", handlers.NowPlayingHandler(db))
 		r.Get("/stats", handlers.StatsHandler(db))
 		r.Get("/search", handlers.SearchHandler(db))
 		r.Get("/aliases", handlers.GetAliasesHandler(db))

internal/catalog/catalog.go

@@ -8,12 +8,14 @@ import (
 	"errors"
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
 	"github.com/gabehf/koito/internal/db"
 	"github.com/gabehf/koito/internal/logger"
 	"github.com/gabehf/koito/internal/mbz"
+	"github.com/gabehf/koito/internal/memkv"
 	"github.com/gabehf/koito/internal/models"
 	"github.com/google/uuid"
 )
@@ -58,6 +60,7 @@ type SubmitListenOpts struct {
 
 	UserID       int32
 	Client       string
+	IsNowPlaying bool
 }
 
 const (
@@ -165,6 +168,14 @@ func SubmitListen(ctx context.Context, store db.DB, opts SubmitListenOpts) error
 		}
 	}
 
+	if opts.IsNowPlaying {
+		if track.Duration == 0 {
+			memkv.Store.Set(strconv.Itoa(int(opts.UserID)), track.ID)
+		} else {
+			memkv.Store.Set(strconv.Itoa(int(opts.UserID)), track.ID, time.Duration(track.Duration)*time.Second)
+		}
+	}
+
 	if opts.SkipSaveListen {
 		return nil
 	}

internal/memkv/memkv.go

@@ -0,0 +1,110 @@
+package memkv
+
+import (
+	"sync"
+	"time"
+)
+
+type item struct {
+	value     interface{}
+	expiresAt time.Time
+}
+
+type InMemoryStore struct {
+	data              map[string]item
+	defaultExpiration time.Duration
+	mu                sync.RWMutex
+	stopJanitor       chan struct{}
+}
+
+var Store *InMemoryStore
+
+func init() {
+	Store = NewStore(10 * time.Minute)
+}
+
+func NewStore(defaultExpiration time.Duration) *InMemoryStore {
+	s := &InMemoryStore{
+		data:              make(map[string]item),
+		defaultExpiration: defaultExpiration,
+		stopJanitor:       make(chan struct{}),
+	}
+
+	go s.janitor(1 * time.Minute)
+
+	return s
+}
+
+func (s *InMemoryStore) Set(key string, value interface{}, expiration ...time.Duration) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	exp := s.defaultExpiration
+	if len(expiration) > 0 {
+		exp = expiration[0]
+	}
+
+	var expiresAt time.Time
+	if exp > 0 {
+		expiresAt = time.Now().Add(exp)
+	}
+
+	s.data[key] = item{
+		value:     value,
+		expiresAt: expiresAt,
+	}
+}
+
+func (s *InMemoryStore) Get(key string) (interface{}, bool) {
+	s.mu.RLock()
+	it, found := s.data[key]
+	s.mu.RUnlock()
+
+	if !found {
+		return nil, false
+	}
+
+	if !it.expiresAt.IsZero() && time.Now().After(it.expiresAt) {
+		s.Delete(key)
+		return nil, false
+	}
+
+	return it.value, true
+}
+
+func (s *InMemoryStore) Delete(key string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	delete(s.data, key)
+}
+
+func (s *InMemoryStore) janitor(interval time.Duration) {
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			s.cleanup()
+		case <-s.stopJanitor:
+			return
+		}
+	}
+}
+
+func (s *InMemoryStore) cleanup() {
+	now := time.Now()
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for k, it := range s.data {
+		if !it.expiresAt.IsZero() && now.After(it.expiresAt) {
+			delete(s.data, k)
+		}
+	}
+}
+
+func (s *InMemoryStore) Close() {
+	close(s.stopJanitor)
+}