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chat.go
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chat.go
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// Simple Go chat client for https://github.com/centrifugal/centrifuge/tree/master/examples/events example.
package main
import (
"bufio"
"encoding/json"
"log"
"os"
"github.com/centrifugal/centrifuge-go"
)
// ChatMessage is chat app specific message struct.
type ChatMessage struct {
Input string `json:"input"`
}
type eventHandler struct{}
func (h *eventHandler) OnConnect(c *centrifuge.Client, e centrifuge.ConnectEvent) {
log.Printf("Connected to chat with ID %s", e.ClientID)
return
}
func (h *eventHandler) OnError(c *centrifuge.Client, e centrifuge.ErrorEvent) {
log.Printf("Error: %s", e.Message)
return
}
func (h *eventHandler) OnDisconnect(c *centrifuge.Client, e centrifuge.DisconnectEvent) {
log.Printf("Disconnected from chat: %s", e.Reason)
return
}
func (h *eventHandler) OnPublish(sub *centrifuge.Subscription, e centrifuge.PublishEvent) {
var chatMessage *ChatMessage
err := json.Unmarshal(e.Data, &chatMessage)
if err != nil {
return
}
log.Printf("Someone says: %s", chatMessage.Input)
}
func (h *eventHandler) OnJoin(sub *centrifuge.Subscription, e centrifuge.JoinEvent) {
log.Printf("Someone joined: user id %s, client id %s", e.User, e.Client)
}
func (h *eventHandler) OnLeave(sub *centrifuge.Subscription, e centrifuge.LeaveEvent) {
log.Printf("Someone left: user id %s, client id %s", e.User, e.Client)
}
func (h *eventHandler) OnSubscribeSuccess(sub *centrifuge.Subscription, e centrifuge.SubscribeSuccessEvent) {
log.Printf("Subscribed on channel %s, resubscribed: %v, recovered: %v", sub.Channel(), e.Resubscribed, e.Recovered)
}
func (h *eventHandler) OnSubscribeError(sub *centrifuge.Subscription, e centrifuge.SubscribeErrorEvent) {
log.Printf("Subscribed on channel %s failed, error: %s", sub.Channel(), e.Error)
}
func (h *eventHandler) OnUnsubscribe(sub *centrifuge.Subscription, e centrifuge.UnsubscribeEvent) {
log.Printf("Unsubscribed from channel %s", sub.Channel())
}
func main() {
url := "ws://localhost:8000/connection/websocket?format=protobuf"
log.Printf("Connect to %s\n", url)
log.Printf("Print something and press ENTER to send\n")
c := centrifuge.New(url, centrifuge.DefaultConfig())
defer c.Close()
handler := &eventHandler{}
c.OnConnect(handler)
c.OnError(handler)
c.OnDisconnect(handler)
sub, err := c.NewSubscription("chat:index")
if err != nil {
log.Fatalln(err)
}
sub.OnPublish(handler)
sub.OnJoin(handler)
sub.OnLeave(handler)
sub.OnSubscribeSuccess(handler)
sub.OnSubscribeError(handler)
sub.OnUnsubscribe(handler)
err = sub.Subscribe()
if err != nil {
log.Fatalln(err)
}
err = c.Connect()
if err != nil {
log.Fatalln(err)
}
// Read input from stdin.
go func(sub *centrifuge.Subscription) {
reader := bufio.NewReader(os.Stdin)
for {
text, _ := reader.ReadString('\n')
msg := &ChatMessage{
Input: text,
}
data, _ := json.Marshal(msg)
sub.Publish(data)
}
}(sub)
// Run until CTRL+C.
select {}
}