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main.go
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main.go
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package main
import (
"bufio"
"embed"
"errors"
"flag"
"fmt"
"github.com/kelseyhightower/envconfig"
"net"
"os"
"os/signal"
"runtime"
"sync"
"syscall"
"time"
)
const (
CONN_HOST = "localhost"
MESSAGE_PORT = "3333"
CONN_TYPE = "tcp"
)
type Config struct {
Username string `envconfig:"CHAT_USERNAME"`
}
type Signaler struct {
mu sync.Mutex
done bool
}
func (s *Signaler) setDoneTrue() {
s.mu.Lock()
defer s.mu.Unlock()
s.done = true
}
func (s *Signaler) read() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.done
}
var emptyUserObject = User{}
var myself = &emptyUserObject
var addr = flag.String("addr", "localhost:7777", "service adress for frontendListener")
var directory = flag.String("d", "../chat/./dist", "the directory of static file to host")
var chat embed.FS
// creating new log file
var log = createLogFile()
func main() {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
//initalise channels for websocket communication on event with the frontend
msgCannel := make(chan Message, 10)
userChannel := make(chan User, 1)
removeUserChannel := make(chan User, 1)
var wg sync.WaitGroup
signaler := Signaler{done: false}
go func() {
sig := <-sigs
broadcast := calculateBroadcastAdress()
conn, err := net.DialUDP("udp4", nil, &net.UDPAddr{IP: broadcast, Port: 9999})
if err != nil {
logger(fmt.Sprintf("error while removing myself from explore: %s", err.Error()), log)
os.Exit(1)
}
defer conn.Close()
logger(fmt.Sprintf("sending removing explore to broadcast adress: %s", broadcast.String()), log)
conn.Write([]byte(""))
wg.Done()
fmt.Print(sig)
signaler.done = true
}()
var s Config
err := envconfig.Process("chat", &s)
if err != nil {
fmt.Println("")
os.Exit(1)
}
defer log.Close()
go explore(log)
go listenForExplorers(log, userChannel, removeUserChannel)
fmt.Println("username: " + s.Username)
myself.Name = s.Username
myself.Active = true
myself.LastLogin = time.Now()
myself.IP = getOwnIPAdress().String()
wg.Add(1) // Wait for 1 goroutine (thread) to be done before stopping to wait
// start goroutine for messageListener
go messageListener(&wg, &signaler, log, msgCannel)
//instance new frontend and start listener from there
go Frontend{msgCannel, userChannel, removeUserChannel}.frontendListener(log)
//TODO: remove testing functions
/*go func() {
recipient := ipaddr.NewIPAddressString("127.0.0.1").GetAddress().GetNetIP()
for i := 0; i < 1000; i++ {
time.Sleep(6 * time.Second)
sendRequest(fmt.Sprintf("Test Nachricht %i", i), &recipient, log)
}
}()
//TODO: remove testing functions
go func(signaler2 Signaler) {
for !signaler2.read() {
if len(exploredUsers) > 0 {
fmt.Println("after if")
recipient := ipaddr.NewIPAddressString(exploredUsers[0].IP).GetAddress().GetNetIP()
fmt.Println("before for")
for i := 0; i < 1000; i++ {
fmt.Println(i)
time.Sleep(6 * time.Second)
sendRequest(fmt.Sprintf("Test Nachricht %i", i), &recipient, log)
}
}
}
}(signaler)
*/
wg.Wait()
}
func messageListener(wg *sync.WaitGroup, signaler *Signaler, log *os.File, msgChannel chan Message) error {
time.Sleep(time.Duration(time.Second * 1))
// Listen for incoming connections.
l, err := net.Listen(CONN_TYPE, "0.0.0.0:"+MESSAGE_PORT)
if err != nil {
fmt.Println("Error listening for messages: ", err.Error())
return err
wg.Done()
}
// Close the messageListener when the application closes.
// defer functions run at the end of the parent-function
defer func(l net.Listener) {
err := l.Close()
if err != nil {
fmt.Println("Error reading:", err.Error())
}
}(l)
logger(fmt.Sprintf("Listening for incoming messages on %s:%s", CONN_HOST, MESSAGE_PORT), log)
for !signaler.read() {
// Listen for an incoming connection.
conn, err := l.Accept()
if err != nil {
fmt.Println("Error accepting incoming message: ", err.Error())
return err
os.Exit(1)
}
connection := Conn{
sourceIp: conn.LocalAddr().String(),
partner: nil,
connection: conn,
}
logger(fmt.Sprintf("handling request from %s", connection.sourceIp), log)
// Handle connections in a new goroutine.
go connection.HandleRequest(log, msgChannel)
}
wg.Done()
return nil
}
func sendRequest(msg string, recipient *net.IP, log *os.File) (err error) {
//connect to server
conn, err := net.Dial(CONN_TYPE, recipient.String()+":"+MESSAGE_PORT)
if err != nil {
logger(fmt.Sprintf("Error connecting: %s", err.Error()), log)
return errors.New("Error Connecting")
}
connection := Conn{
sourceIp: conn.LocalAddr().String(),
partner: myself,
connection: conn,
}
connection.SendRequest(msg, log)
return nil
}
func userSetup(log *os.File) {
reader := bufio.NewReader(os.Stdin)
fmt.Print("choose a nickname: ")
nick, _ := reader.ReadString('\n')
logger(fmt.Sprintf("nickname set as %s", nick), log)
myself.Name = nick
myself.LastLogin = time.Now()
myself.Active = true
}
// func checkForServer(log *os.File) {
// conn, err := net.Dial(CONN_TYPE, ":"+MESSAGE_PORT)
// if err != nil {
// logger("Server wasn't available, Client shutting down", log)
// fmt.Println("Server not responding, exiting...")
// conn.Close()
// os.Exit(1)
// } else {
// conn.Write([]byte("2"))
// logger(fmt.Sprintf("%s %s %s\n", CONN_HOST, "responding on port:", MESSAGE_PORT), log)
// conn.Close()
// }
// }
func createLogFile() *os.File {
t := time.Now()
os.Chdir("log")
f, err := os.Create("log-" + t.Format("01-02-2006 15:04:05 Monday"))
if err != nil {
os.Exit(1)
}
return f
}
func logger(msg string, log *os.File) {
h, m, s := time.Now().Hour(), time.Now().Minute(), time.Now().Second()
_, file, line, _ := runtime.Caller(1)
log.WriteString(fmt.Sprintf("%s Zeile:%d %d:%d:%d : %s \n", file, line, h, m, s, msg))
}
// // Handles incoming requests.
// func handleRequest(conn net.Conn) {
// // Make a buffer to hold incoming data.
// buf := make([]byte, 1024)
// // Read the incoming connection into the buffer.
// reqLen, err := conn.Read(buf)
// if err != nil {
// fmt.Println("Error reading:", err.Error())
// }
// // Send a response back to person contacting us.
// conn.Write([]byte(fmt.Sprintf("Message received. Length: %d", reqLen)))
// // Close the connection when you're done with it.
// conn.Close()
// }