/
observer.go
82 lines (65 loc) · 1.45 KB
/
observer.go
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
package observer
import (
"github.com/go-kratos/kratos/v2/log"
"github.com/google/wire"
v1 "github.com/gusarow4321/TinyChat/messenger/api/messenger/v1"
"sync"
)
// ProviderSet is observer providers.
var ProviderSet = wire.NewSet(NewObserver)
type ChatsObserver interface {
Register(int64, int64, chan *v1.NewMessage)
Deregister(int64, int64)
Publish(int64, *v1.NewMessage)
}
type chat struct {
channels map[int64]chan *v1.NewMessage
}
type Observer struct {
sync.RWMutex
chats map[int64]*chat
log *log.Helper
}
func NewObserver(logger log.Logger) ChatsObserver {
return &Observer{
chats: make(map[int64]*chat),
log: log.NewHelper(logger),
}
}
func (o *Observer) Register(chatId, userId int64, channel chan *v1.NewMessage) {
o.Lock()
defer o.Unlock()
c, ok := o.chats[chatId]
if !ok {
c = &chat{make(map[int64]chan *v1.NewMessage)}
o.chats[chatId] = c
}
c.channels[userId] = channel
}
func (o *Observer) Deregister(chatId, userId int64) {
o.Lock()
defer o.Unlock()
c, ok := o.chats[chatId]
if !ok {
return
}
delete(c.channels, userId)
if len(c.channels) == 0 {
delete(o.chats, chatId)
}
}
func (o *Observer) Publish(chatId int64, msg *v1.NewMessage) {
o.RLock()
defer o.RUnlock()
c, ok := o.chats[chatId]
if !ok {
return
}
for userId, channel := range c.channels {
if len(channel) == cap(channel) {
o.log.Warnf("User %v didn't receive a message, the channel is full", userId)
continue
}
channel <- msg
}
}