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main.go
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main.go
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package main
import (
"bytes"
"context"
"flag"
"io"
"log"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"time"
_ "net/http/pprof"
"github.com/centrifugal/centrifuge"
"github.com/gobwas/ws"
"github.com/mailru/easygo/netpoll"
)
var (
workers = flag.Int("workers", 128, "max workers count")
queue = flag.Int("queue", 1, "workers task queue size")
ioTimeout = flag.Duration("io_timeout", time.Millisecond*500, "i/o operations timeout")
)
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() {
flag.Parse()
node, _ := centrifuge.New(centrifuge.Config{
LogLevel: centrifuge.LogLevelDebug,
LogHandler: handleLog,
})
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) {
transport := client.Transport()
log.Printf("user %s connected via %s with format: %s", client.UserID(), transport.Name(), transport.Protocol())
// Connect handler should not block, so start separate goroutine to
// periodically send messages to client.
go func() {
for {
err := client.Send([]byte(`{"time": "` + strconv.FormatInt(time.Now().Unix(), 10) + `"}`))
if err != nil {
if err != io.EOF {
log.Println(err.Error())
} else {
return
}
}
time.Sleep(5 * time.Second)
}
}()
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.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)
}
// Initialize netpoll instance. We will use it to be noticed about incoming
// events from listener of user connections.
poller, err := netpoll.New(nil)
if err != nil {
log.Fatal(err)
}
var (
// Make pool of X size, Y sized work queue and one pre-spawned
// goroutine.
pool = NewPool(*workers, *queue, 1)
)
// handle is a new incoming connection handler.
// It upgrades TCP connection to WebSocket, registers netpoll listener on
// it and stores it as a chat user in Chat instance.
//
// We will call it below within accept() loop.
handle := func(conn net.Conn) {
// NOTE: we wrap conn here to show that ws could work with any kind of
// io.ReadWriter.
safeConn := deadliner{conn, *ioTimeout}
protoType := centrifuge.ProtocolTypeJSON
up := ws.Upgrader{
OnRequest: func(uri []byte) error {
if strings.Contains(string(uri), "format=protobuf") {
protoType = centrifuge.ProtocolTypeProtobuf
}
return nil
},
}
// Zero-copy upgrade to WebSocket connection.
hs, err := up.Upgrade(safeConn)
if err != nil {
log.Printf("%s: upgrade error: %v", nameConn(conn), err)
_ = conn.Close()
return
}
log.Printf("%s: established websocket connection: %+v", nameConn(conn), hs)
transport := newWebsocketTransport(safeConn, protoType)
client, closeFn, err := centrifuge.NewClient(context.Background(), node, transport)
if err != nil {
log.Printf("%s: client create error: %v", nameConn(conn), err)
_ = conn.Close()
return
}
// Create netpoll event descriptor for conn.
// We want to handle only read events of it.
desc := netpoll.Must(netpoll.HandleReadOnce(conn))
// Subscribe to events about conn.
_ = poller.Start(desc, func(ev netpoll.Event) {
if ev&(netpoll.EventReadHup|netpoll.EventHup) != 0 {
// When ReadHup or Hup received, this mean that client has
// closed at least write end of the connection or connections
// itself. So we want to stop receive events about such conn
// and remove it from the chat registry.
_ = poller.Stop(desc)
_ = closeFn()
return
}
// Here we can read some new message from connection.
// We can not read it right here in callback, because then we will
// block the poller's inner loop.
// We do not want to spawn a new goroutine to read single message.
// But we want to reuse previously spawned goroutine.
pool.Schedule(func() {
if data, isControl, err := transport.read(); err != nil {
// When receive failed, we can only disconnect broken
// connection and stop to receive events about it.
_ = poller.Stop(desc)
_ = closeFn()
} else {
if !isControl {
ok := centrifuge.HandleReadFrame(client, bytes.NewReader(data))
if !ok {
_ = poller.Stop(desc)
return
}
}
_ = poller.Resume(desc)
}
})
})
}
// Create incoming connections listener.
ln, err := net.Listen("tcp", ":3333")
if err != nil {
log.Fatal(err)
}
log.Printf("websocket is listening on %s", ln.Addr().String())
// Create netpoll descriptor for the listener.
// We use OneShot here to manually resume events stream when we want to.
acceptDesc := netpoll.Must(netpoll.HandleListener(
ln, netpoll.EventRead|netpoll.EventOneShot,
))
// accept is a channel to signal about next incoming connection Accept()
// results.
accept := make(chan error, 1)
// Subscribe to events about listener.
_ = poller.Start(acceptDesc, func(e netpoll.Event) {
// We do not want to accept incoming connection when goroutine pool is
// busy. So if there are no free goroutines during 1ms we want to
// cooldown the server and do not receive connection for some short
// time.
err := pool.ScheduleTimeout(time.Millisecond, func() {
conn, err := ln.Accept()
if err != nil {
accept <- err
return
}
accept <- nil
handle(conn)
})
if err == nil {
err = <-accept
}
if err != nil {
if err != ErrScheduleTimeout {
goto cooldown
}
if ne, ok := err.(net.Error); ok && ne.Temporary() {
goto cooldown
}
log.Fatalf("accept error: %v", err)
cooldown:
delay := 5 * time.Millisecond
log.Printf("accept error: %v; retrying in %s", err, delay)
time.Sleep(delay)
}
_ = poller.Resume(acceptDesc)
})
go func() {
http.Handle("/", http.FileServer(http.Dir("./")))
log.Printf("run http server on :8000")
if err := http.ListenAndServe(":8000", nil); err != nil {
log.Fatal(err)
}
}()
waitExitSignal(node)
log.Println("bye!")
}
func nameConn(conn net.Conn) string {
return conn.LocalAddr().String() + " > " + conn.RemoteAddr().String()
}
// deadliner is a wrapper around net.Conn that sets read/write deadlines before
// every Read() or Write() call.
type deadliner struct {
net.Conn
t time.Duration
}
func (d deadliner) Write(p []byte) (int, error) {
if err := d.Conn.SetWriteDeadline(time.Now().Add(d.t)); err != nil {
return 0, err
}
return d.Conn.Write(p)
}
func (d deadliner) Read(p []byte) (int, error) {
if err := d.Conn.SetReadDeadline(time.Now().Add(d.t)); err != nil {
return 0, err
}
return d.Conn.Read(p)
}