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package main
import (
"context"
"io"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"time"
_ "net/http/pprof"
"github.com/centrifugal/centrifuge"
)
func handleLog(e centrifuge.LogEntry) {
log.Printf("%s: %v", e.Message, e.Fields)
}
func authMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
newCtx := centrifuge.SetCredentials(ctx, ¢rifuge.Credentials{
UserID: "42",
ExpireAt: time.Now().Unix() + 10,
Info: []byte(`{"name": "Alexander"}`),
})
r = r.WithContext(newCtx)
h.ServeHTTP(w, r)
})
}
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.LogLevelDebug
cfg.LogHandler = handleLog
node, _ := centrifuge.New(cfg)
node.OnConnecting(func(ctx context.Context, e centrifuge.ConnectEvent) (centrifuge.ConnectReply, error) {
return centrifuge.ConnectReply{
Data: []byte(`{}`),
}, nil
})
node.OnConnect(func(client *centrifuge.Client) {
transport := client.Transport()
log.Printf("user %s connected via %s with protocol: %s", client.UserID(), transport.Name(), transport.Protocol())
go func() {
err := client.Send([]byte("hello"))
if err != nil {
if err == io.EOF {
return
}
log.Fatalln(err.Error())
}
}()
client.OnRefresh(func(e centrifuge.RefreshEvent, cb centrifuge.RefreshCallback) {
log.Printf("user %s connection is going to expire, refreshing", client.UserID())
cb(centrifuge.RefreshReply{
ExpireAt: time.Now().Unix() + 10,
}, nil)
})
client.OnSubscribe(func(e centrifuge.SubscribeEvent, cb centrifuge.SubscribeCallback) {
log.Printf("user %s subscribes on %s", client.UserID(), e.Channel)
cb(centrifuge.SubscribeReply{}, nil)
})
client.OnUnsubscribe(func(e centrifuge.UnsubscribeEvent) {
log.Printf("user %s unsubscribed from %s", client.UserID(), e.Channel)
})
client.OnPublish(func(e centrifuge.PublishEvent, cb centrifuge.PublishCallback) {
log.Printf("user %s publishes into channel %s: %s", client.UserID(), e.Channel, string(e.Data))
cb(centrifuge.PublishReply{}, nil)
})
client.OnRPC(func(e centrifuge.RPCEvent, cb centrifuge.RPCCallback) {
log.Printf("RPC from user: %s, data: %s", client.UserID(), string(e.Data))
cb(centrifuge.RPCReply{
Data: []byte(`{"year": "2020"}`),
}, nil)
})
client.OnMessage(func(e centrifuge.MessageEvent) {
log.Printf("message from user: %s, data: %s", client.UserID(), string(e.Data))
})
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)
}
http.Handle("/connection/websocket", authMiddleware(centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{})))
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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