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|
package chat
import (
"context"
"log/slog"
"sync"
"time"
)
type Channel struct {
Name string
Users map[*User]struct{}
Events chan any
mu sync.RWMutex
}
func (c *Channel) Listen(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
case ev := <-c.Events:
c.processEvent(ev)
}
}
}
func (c *Channel) processEvent(ev any) {
slog.Info("channel event", slog.String("channel", c.Name), slog.Any("event", ev))
for u := range c.Users {
if ev, ok := ev.(Message); ok {
if ev.User == u {
// Do not return user message to him
continue
}
}
select {
case u.Events <- ev:
default:
}
}
}
func (c *Channel) Join(u *User) {
c.mu.Lock()
defer c.mu.Unlock()
if _, ok := c.Users[u]; ok {
return
}
c.Events <- UserJoined{
User: u,
Time: time.Now(),
Chan: c,
}
c.Users[u] = struct{}{}
}
func (c *Channel) Leave(u *User) {
c.mu.Lock()
defer c.mu.Unlock()
if _, ok := c.Users[u]; !ok {
return
}
c.Events <- UserLeft{
User: u,
Time: time.Now(),
Chan: c,
}
delete(c.Users, u)
}
|
