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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/centrifugal/centrifuge"
)
type event struct {
Name string `json:"name"`
Payload json.RawMessage `json:"payload"`
}
func handleLog(e centrifuge.LogEntry) {
log.Printf("[centrifuge %s] %s: %v", centrifuge.LogLevelToString(e.Level), e.Message, e.Fields)
}
func authMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
ctx = centrifuge.SetCredentials(ctx, ¢rifuge.Credentials{
UserID: "",
})
r = r.WithContext(ctx)
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{
Credentials: ¢rifuge.Credentials{
UserID: "",
},
}, nil
})
node.OnConnect(func(client *centrifuge.Client) {
log.Printf("worm connected via %s", client.Transport().Name())
client.OnMessage(func(e centrifuge.MessageEvent) {
var ev event
_ = json.Unmarshal(e.Data, &ev)
_, _ = node.Publish("moving", ev.Payload)
})
client.OnSubscribe(func(e centrifuge.SubscribeEvent, cb centrifuge.SubscribeCallback) {
log.Printf("worm subscribed on %s", e.Channel)
cb(centrifuge.SubscribeReply{}, nil)
})
client.OnUnsubscribe(func(e centrifuge.UnsubscribeEvent) {
log.Printf("worm unsubscribed from %s", e.Channel)
})
client.OnDisconnect(func(e centrifuge.DisconnectEvent) {
log.Printf("worm disconnected, disconnect: %s", e.Disconnect)
})
})
if err := node.Run(); err != nil {
panic(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 {
panic(err)
}
}()
waitExitSignal(node)
fmt.Println("exiting")
}
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