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package main
import (
"encoding/json"
"fmt"
"fyne.io/fyne/v2/data/binding"
"log"
"net"
"sync"
)
var storage struct {
sync.RWMutex
messages []Request
stringData []string
data binding.ExternalStringList
}
type UserData struct {
Username string
}
type Client struct {
senderConn net.Listener
receiverConn net.Listener
}
func readResponse(conn net.Conn) (Response, error) {
var response Response
var err error
buf := make([]byte, 4096)
_, err = conn.Read(buf)
if err != nil {
return response, err
}
size := fromBytes(buf[:4])
rawResponse := buf[4 : size+4]
return parseResponse(rawResponse)
}
func sender(conn net.Conn, wg *sync.WaitGroup, user UserData, c chan string) {
var err error
authMsg, _ := json.Marshal(Request{
Type: AUTHENTICATE,
Data: AUTHENTICATE,
User: user.Username,
})
_ = sendMessage(conn, authMsg)
for {
line := <-c
channelLock.Unlock()
request, _ := json.Marshal(Request{
Type: MESSAGE,
Data: line,
User: user.Username,
})
err = sendMessage(conn, request)
if err != nil {
fmt.Printf("Error in sender: %s", err)
break
}
response, _ := readResponse(conn)
_ = fmt.Sprintf("%s", response)
}
exitMsg, _ := json.Marshal(Request{
Type: EXIT,
Data: EXIT,
User: user.Username,
})
_ = sendMessage(conn, exitMsg)
fmt.Println("Closed connection")
wg.Done()
}
func receiver(conn net.Conn, wg *sync.WaitGroup, user UserData) {
var err error
req := Request{
Type: AUTHENTICATE,
Data: AUTHENTICATE,
User: user.Username,
}
err = sendMessage(conn, []byte(req.serialize()))
if err != nil {
fmt.Println(err)
return
}
_, err = readResponse(conn)
if err != nil {
return
}
for {
response, err := readResponse(conn)
if err != nil {
break
}
if response.Status == PING {
req := Request{
Type: PING,
Data: SUCCESS,
User: user.Username,
}
_ = sendMessage(conn, []byte(req.serialize()))
continue
}
message, err := parseRequest([]byte(response.Data))
if err == nil {
storage.Lock()
//storage.messages = append(storage.messages, message)
_ = storage.data.Append(message.toString())
storage.Unlock()
} else {
fmt.Println(err)
}
req := Request{
Type: MESSAGE,
Data: SUCCESS,
User: user.Username,
}
_ = sendMessage(conn, []byte(req.serialize()))
}
wg.Done()
}
func runClient(user UserData, c chan string) {
var wg sync.WaitGroup
senderConn, err := net.Dial("tcp", "localhost:8080")
handleError(err)
defer senderConn.Close()
wg.Add(1)
receiverConn, err := net.Dial("tcp", "localhost:8081")
handleError(err)
defer receiverConn.Close()
wg.Add(1)
go sender(senderConn, &wg, user, c)
go receiver(receiverConn, &wg, user)
wg.Wait()
}
func handleError(err error) {
if err != nil {
log.Fatal(err)
}
}
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