ListenBrainz API listens exporter

backends/listenbrainz.go

@@ -0,0 +1,90 @@
+/*
+Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package backends
+
+import (
+	"time"
+
+	"github.com/spf13/viper"
+	"go.uploadedlobster.com/scotty/backends/listenbrainz"
+)
+
+type ListenBrainzApiBackend struct {
+	client   listenbrainz.Client
+	username string
+}
+
+func (b ListenBrainzApiBackend) FromConfig(config *viper.Viper) Backend {
+	b.client = listenbrainz.New(config.GetString("token"))
+	b.client.MaxResults = listenbrainz.MaxItemsPerGet
+	b.username = config.GetString("username")
+	return b
+}
+
+func (b ListenBrainzApiBackend) ExportListens(oldestTimestamp time.Time) ([]Listen, error) {
+	minTs := oldestTimestamp
+	listens := make([]Listen, 0)
+
+	for {
+		result, err := b.client.GetListens(b.username, minTs)
+		if err != nil {
+			return nil, err
+		}
+
+		count := len(result.Payload.Listens)
+		if count == 0 {
+			break
+		}
+
+		// Set minTs to the newest returned listen
+		minTs = time.Unix(result.Payload.Listens[0].ListenedAt, 0)
+
+		// Iterate over the returned listens in reverse order (oldest first)
+		for i := count - 1; i >= 0; i-- {
+			lbListen := result.Payload.Listens[i]
+			listens = append(listens, Listen{}.FromListenBrainz(lbListen))
+		}
+	}
+
+	return listens, nil
+}
+
+func (l Listen) FromListenBrainz(lbListen listenbrainz.Listen) Listen {
+	track := lbListen.TrackMetadata
+	listen := Listen{
+		ListenedAt: time.Unix(lbListen.ListenedAt, 0),
+		UserName:   lbListen.UserName,
+		Track: Track{
+			TrackName:        track.TrackName,
+			ReleaseName:      track.ReleaseName,
+			ArtistNames:      []string{track.ArtistName},
+			Duration:         track.Duration(),
+			TrackNumber:      track.TrackNumber(),
+			RecordingMbid:    MBID(track.RecordingMbid()),
+			ReleaseMbid:      MBID(track.ReleaseMbid()),
+			ReleaseGroupMbid: MBID(track.ReleaseGroupMbid()),
+			Isrc:             track.Isrc(),
+			AdditionalInfo:   track.AdditionalInfo,
+		},
+	}
+	return listen
+}