1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
package main
import (
"crypto/sha1"
"encoding/base64"
"fmt"
"log"
"github.com/google/uuid"
"nhooyr.io/websocket"
)
type Song struct {
Title string `json:"title"`
Artist string `json:"artist"`
Source string `json:"source"`
Id string `json:"id"`
Weight int `json:"weight"`
index int `json:"-"` // used by heap.Interface
Upvotes map[string]struct{} `json:"-"`
Downvotes map[string]struct{} `json:"-"`
}
func NewSong(title string, artist string, source string) Song {
s := Song{title, artist, source, "", 0, 0, map[string]struct{}{}, map[string]struct{}{}}
h := sha1.New()
h.Write([]byte(title))
h.Write([]byte(artist))
h.Write([]byte(source))
s.Id = base64.URLEncoding.EncodeToString(h.Sum(nil))
return s
}
type Event struct {
Event string `json:"cmd"`
Songs []Song `json:"songs"`
}
type Connection struct {
Id uuid.UUID
Events chan Event
C *websocket.Conn
}
func (c *Connection) Close() {
log.Println("Closing connection %s", c.Id)
close(c.Events)
c.C.Close(websocket.StatusNormalClosure, "")
}
type Wrms struct {
Connections []Connection
Songs []Song
Queue Playlist
CurrentSong *Song
Player Player
Playing bool
}
func NewWrms() Wrms {
wrms := Wrms{}
wrms.Player = NewPlayer()
return wrms
}
func (wrms *Wrms) Close() {
log.Println("Closing WRMS")
for _, conn := range wrms.Connections {
conn.Close()
}
}
func (wrms *Wrms) Broadcast(cmd Event) {
for i := 0; i < len(wrms.Connections); i++ {
wrms.Connections[i].Events <- cmd
}
}
func (wrms *Wrms) AddSong(song Song) {
wrms.Songs = append(wrms.Songs, song)
wrms.Queue.Add(&wrms.Songs[len(wrms.Songs) - 1])
}
func (wrms *Wrms) Next() {
wrms.CurrentSong = wrms.Queue.PopSong()
for i, s := range wrms.Songs {
if s.Id == wrms.CurrentSong.Id {
wrms.Songs[i] = wrms.Songs[len(wrms.Songs) - 1]
wrms.Songs = wrms.Songs[:len(wrms.Songs) - 1]
break
}
}
}
func (wrms *Wrms) PlayPause() {
var ev Event
if !wrms.Playing {
if wrms.CurrentSong == nil {
wrms.Next()
}
ev = Event{"play", []Song{*wrms.CurrentSong}}
} else {
ev = Event{"pause", []Song{}}
}
wrms.Playing = !wrms.Playing
wrms.Broadcast(ev)
}
func (wrms *Wrms) AdjustSongWeight(connId string, songId string, vote string) {
for i := 0; i < len(wrms.Songs); i++ {
s := &wrms.Songs[i]
if s.Id != songId {
continue
}
switch vote {
case "up":
if _, ok := s.Upvotes[connId]; ok {
log.Println(fmt.Sprintf("Double upvote of song %s by connections %s", songId, connId))
return
}
if _, ok := s.Downvotes[connId]; ok {
delete(s.Downvotes, connId)
s.Weight += 2
} else {
s.Weight += 1
}
s.Upvotes[connId] = struct{}{}
case "down":
if _, ok := s.Downvotes[connId]; ok {
log.Println(fmt.Sprintf("Double downvote of song %s by connections %s", songId, connId))
return
}
if _, ok := s.Upvotes[connId]; ok {
delete(s.Upvotes, connId)
s.Weight -= 2
} else {
s.Weight -= 1
}
s.Downvotes[connId] = struct{}{}
case "unvote":
if _, ok := s.Downvotes[connId]; ok {
delete(s.Downvotes, connId)
s.Weight += 1
}
if _, ok := s.Upvotes[connId]; ok {
delete(s.Upvotes, connId)
s.Weight -= 1
} else {
log.Println(fmt.Sprintf("Double downvote of song %s by connections %s", songId, connId))
return
}
default:
log.Fatal("invalid vote")
}
wrms.Queue.Adjust(s)
wrms.Broadcast(Event{"update", []Song{*s}})
break
}
}
|
