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package main
import (
"context"
"flag"
"log"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"time"
_ "net/http/pprof"
"github.com/centrifugal/centrifuge"
)
var (
port = flag.Int("port", 8000, "Port to bind app to")
)
func handleLog(e centrifuge.LogEntry) {
log.Printf("[centrifuge] %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()
ctx = centrifuge.SetCredentials(ctx, ¢rifuge.Credentials{
UserID: "42",
Info: []byte(`{"name": "Alexander"}`),
})
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() {
flag.Parse()
cfg := centrifuge.DefaultConfig
cfg.LogLevel = centrifuge.LogLevelDebug
cfg.LogHandler = handleLog
node, _ := centrifuge.New(cfg)
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())
client.OnSubscribe(func(e centrifuge.SubscribeEvent, cb centrifuge.SubscribeCallback) {
log.Printf("user %s subscribes on %s", client.UserID(), e.Channel)
cb(centrifuge.SubscribeReply{
Options: centrifuge.SubscribeOptions{
Presence: true,
JoinLeave: true,
Recover: true,
},
}, 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{
Options: centrifuge.PublishOptions{
HistorySize: 100,
HistoryTTL: 5 * time.Second,
},
}, nil)
})
client.OnPresence(func(e centrifuge.PresenceEvent, cb centrifuge.PresenceCallback) {
cb(centrifuge.PresenceReply{}, nil)
})
client.OnDisconnect(func(e centrifuge.DisconnectEvent) {
log.Printf("user %s disconnected, disconnect: %s", client.UserID(), e.Disconnect)
})
})
redisShardConfigs := []centrifuge.RedisShardConfig{
{Address: "localhost:6379"},
{Address: "localhost:6380"},
}
var redisShards []*centrifuge.RedisShard
for _, redisConf := range redisShardConfigs {
redisShard, err := centrifuge.NewRedisShard(node, redisConf)
if err != nil {
log.Fatal(err)
}
redisShards = append(redisShards, redisShard)
}
broker, err := centrifuge.NewRedisBroker(node, centrifuge.RedisBrokerConfig{
// We are using Redis streams here for history.
UseStreams: true,
// Use reasonably large expiration interval for stream meta key,
// much bigger than maximum HistoryLifetime value in Node config.
// This way stream meta data will expire, in some cases you may want
// to prevent its expiration setting this to zero value.
HistoryMetaTTL: 7 * 24 * time.Hour,
// And configure a couple of shards to use.
Shards: redisShards,
})
if err != nil {
log.Fatal(err)
}
node.SetBroker(broker)
presenceManager, err := centrifuge.NewRedisPresenceManager(node, centrifuge.RedisPresenceManagerConfig{
Shards: redisShards,
})
if err != nil {
log.Fatal(err)
}
node.SetPresenceManager(presenceManager)
if err := node.Run(); err != nil {
log.Fatal(err)
}
go func() {
// Publish channel notifications from server periodically.
i := 1
for {
_, err := node.Publish("chat:index", []byte(`{"input": "`+strconv.Itoa(i)+`"}`))
if err != nil {
log.Printf("error publishing to personal channel: %s", err)
}
i++
time.Sleep(5000 * time.Millisecond)
}
}()
// Simulate some work inside Redis.
for i := 0; i < 10; i++ {
go func(i int) {
for {
time.Sleep(time.Second)
_, err := node.Publish("chat:"+strconv.Itoa(i), []byte("hello"))
if err != nil {
log.Println(err.Error())
}
_, err = node.History("chat:" + strconv.Itoa(i))
if err != nil {
log.Println(err.Error())
}
}
}(i)
}
http.Handle("/connection/websocket", authMiddleware(centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{})))
http.Handle("/", http.FileServer(http.Dir("./")))
go func() {
if err := http.ListenAndServe(":"+strconv.Itoa(*port), nil); err != nil {
log.Fatal(err)
}
}()
waitExitSignal(node)
log.Println("bye!")
}
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