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package main
import (
"context"
"log"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
_ "net/http/pprof"
"github.com/centrifugal/centrifuge"
)
func handleLog(e centrifuge.LogEntry) {
log.Printf("%s: %v", e.Message, e.Fields)
}
func waitExitSignal(n *centrifuge.Node) {
sigCh := make(chan os.Signal, 1)
done := make(chan bool, 1)
signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sigCh
_ = n.Shutdown(context.Background())
done <- true
}()
<-done
}
func main() {
cfg := centrifuge.DefaultConfig
cfg.LogLevel = centrifuge.LogLevelInfo
cfg.LogHandler = handleLog
// Better to keep default in production. Here we just speeding up things a bit.
cfg.ClientExpiredCloseDelay = 5 * time.Second
node, _ := centrifuge.New(cfg)
broker, _ := centrifuge.NewMemoryBroker(node, centrifuge.MemoryBrokerConfig{
HistoryMetaTTL: 120 * time.Second,
})
node.SetBroker(broker)
node.OnConnecting(func(ctx context.Context, e centrifuge.ConnectEvent) (centrifuge.ConnectReply, error) {
// We need to apply token parsing logic here and return connection credentials.
if !strings.HasPrefix(e.Token, "I am ") {
return centrifuge.ConnectReply{}, centrifuge.DisconnectInvalidToken
}
userID := strings.TrimPrefix(e.Token, "I am ")
credentials := ¢rifuge.Credentials{
UserID: userID,
ExpireAt: time.Now().Unix() + 5, // Expire in 5 seconds.
}
return centrifuge.ConnectReply{
ClientSideRefresh: true, // This is required to use client-side refresh.
Credentials: credentials,
}, nil
})
node.OnConnect(func(client *centrifuge.Client) {
log.Printf("user %s connected", client.UserID())
client.OnRefresh(func(e centrifuge.RefreshEvent, cb centrifuge.RefreshCallback) {
log.Printf("user %s sent refresh command with token: %s", client.UserID(), e.Token)
if !strings.HasPrefix(e.Token, "I am ") {
cb(centrifuge.RefreshReply{}, centrifuge.DisconnectInvalidToken)
return
}
userID := strings.TrimPrefix(e.Token, "I am ")
if userID != client.UserID() {
cb(centrifuge.RefreshReply{}, centrifuge.DisconnectInvalidToken)
return
}
cb(centrifuge.RefreshReply{
ExpireAt: time.Now().Unix() + 5,
}, nil)
})
client.OnDisconnect(func(e centrifuge.DisconnectEvent) {
log.Printf("user %s disconnected, disconnect: %s", client.UserID(), e.Disconnect)
})
})
if err := node.Run(); err != nil {
log.Fatal(err)
}
websocketHandler := centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{
ReadBufferSize: 1024,
UseWriteBufferPool: true,
})
http.Handle("/connection/websocket", websocketHandler)
http.Handle("/", http.FileServer(http.Dir("./")))
go func() {
if err := http.ListenAndServe(":8000", nil); err != nil {
log.Fatal(err)
}
}()
waitExitSignal(node)
log.Println("bye!")
}
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