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main.go
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main.go
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package main
import (
"context"
"log"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/abhirockzz/redis-chat-go/chat"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
}
var redisHost string
var redisPassword string
const port = "8080"
func init() {
redisHost = os.Getenv("REDIS_HOST")
if redisHost == "" {
log.Fatal("missing REDIS_HOST env var")
}
redisPassword = os.Getenv("REDIS_PASSWORD")
if redisPassword == "" {
log.Fatal("missing REDIS_PASSWORD env var")
}
}
func main() {
http.HandleFunc("/", func(rw http.ResponseWriter, req *http.Request) {
rw.Write([]byte("you are good to go!"))
})
http.Handle("/chat/", http.HandlerFunc(websocketHandler))
server := http.Server{Addr: ":" + port, Handler: nil}
go func() {
err := server.ListenAndServe()
if err != nil && err != http.ErrServerClosed {
log.Fatal("failed to start server", err)
}
}()
exit := make(chan os.Signal)
signal.Notify(exit, syscall.SIGTERM, syscall.SIGINT)
<-exit
log.Println("exit signalled")
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
chat.Cleanup()
server.Shutdown(ctx)
log.Println("chat app exited")
}
func websocketHandler(rw http.ResponseWriter, req *http.Request) {
user := strings.TrimPrefix(req.URL.Path, "/chat/")
peer, err := upgrader.Upgrade(rw, req, nil)
if err != nil {
log.Fatal("websocket conn failed", err)
}
chatSession := chat.NewChatSession(user, peer)
chatSession.Start()
}