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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"
"github.com/centrifugal/centrifuge/_examples/custom_engine_tarantool/tntengine"
)
var (
port = flag.Int("port", 8000, "Port to bind app to")
sharded = flag.Bool("sharded", false, "Start sharded example")
ha = flag.Bool("ha", false, "Start high availability example")
raft = flag.Bool("raft", false, "Using Raft-based replication")
user = flag.String("user", "guest", "Connection user")
password = flag.String("password", "", "Connection password")
)
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: 10,
HistoryTTL: 10 * time.Minute,
},
}, nil)
})
client.OnPresence(func(e centrifuge.PresenceEvent, cb centrifuge.PresenceCallback) {
log.Printf("user %s calls presence on %s", client.UserID(), e.Channel)
if !client.IsSubscribed(e.Channel) {
cb(centrifuge.PresenceReply{}, centrifuge.ErrorPermissionDenied)
return
}
cb(centrifuge.PresenceReply{}, nil)
})
client.OnPresenceStats(func(e centrifuge.PresenceStatsEvent, cb centrifuge.PresenceStatsCallback) {
log.Printf("user %s calls presence stats on %s", client.UserID(), e.Channel)
if !client.IsSubscribed(e.Channel) {
cb(centrifuge.PresenceStatsReply{}, centrifuge.ErrorPermissionDenied)
return
}
cb(centrifuge.PresenceStatsReply{}, nil)
})
client.OnDisconnect(func(e centrifuge.DisconnectEvent) {
log.Printf("user %s disconnected, disconnect: %s", client.UserID(), e.Disconnect)
})
})
// Single Tarantool.
mode := tntengine.ConnectionModeSingleInstance
shardAddresses := [][]string{
{"127.0.0.1:3301"},
}
if *ha {
if *raft {
// Single Tarantool RS with automatic leader election with Raft (Tarantool >= 2.7.0).
shardAddresses = [][]string{
{"127.0.0.1:3301", "127.0.0.1:3302", "127.0.0.1:3303"},
}
mode = tntengine.ConnectionModeLeaderFollowerRaft
} else {
// Single Tarantool RS with automatic leader election (ex. in Cartridge).
shardAddresses = [][]string{
{"127.0.0.1:3301", "127.0.0.1:3302"},
}
mode = tntengine.ConnectionModeLeaderFollower
}
} else if *sharded {
// Client-side sharding between two Tarantool instances (without HA).
shardAddresses = [][]string{
{"127.0.0.1:3301"},
{"127.0.0.1:3302"},
}
}
var shards []*tntengine.Shard
for _, addresses := range shardAddresses {
shard, err := tntengine.NewShard(tntengine.ShardConfig{
Addresses: addresses,
User: *user,
Password: *password,
ConnectionMode: mode,
})
if err != nil {
log.Fatal(err)
}
shards = append(shards, shard)
}
broker, err := tntengine.NewBroker(node, tntengine.BrokerConfig{
UsePolling: false,
Shards: shards,
})
if err != nil {
log.Fatal(err)
}
node.SetBroker(broker)
presenceManager, err := tntengine.NewPresenceManager(node, tntengine.PresenceManagerConfig{
Shards: shards,
})
if err != nil {
log.Fatal(err)
}
node.SetPresenceManager(presenceManager)
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(":"+strconv.Itoa(*port), nil); err != nil {
log.Fatal(err)
}
}()
waitExitSignal(node)
log.Println("bye!")
}
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