CoSync/lab/TcpServExample.gone

package lab

import (
	"bufio"
	"fmt"
	"io"
	"net"
	"os"
)

func ExampleMain() {
	// Choose either server or client mode
	if len(os.Args) > 1 && os.Args[1] == "server" {
		runServer()
	} else {
		runClient()
	}
}

func runServer() {
	listener, err := net.Listen("tcp", ":8080")
	if err != nil {
		panic(err)
	}
	defer listener.Close()

	fmt.Println("Server listening on :8080")

	for {
		conn, err := listener.Accept()
		if err != nil {
			fmt.Println("Error accepting connection:", err)
			continue
		}
		go handleConnection(conn)
	}
}

func handleConnection(conn net.Conn) {
	defer conn.Close()

	reader := bufio.NewReader(conn)
	for {
		message, err := reader.ReadString('\n')
		if err != nil {
			if err == io.EOF {
				fmt.Println("Client disconnected")
				return
			}
			fmt.Println("Error reading from client:", err)
			return
		}
		fmt.Println("Received from client:", message)

		// Process the message (e.g., send a response)
		// ...

		// Send a response to the client
		_, err = conn.Write([]byte("Server received your message\n"))
		if err != nil {
			fmt.Println("Error writing to client:", err)
			return
		}
	}
}

func runClient() {
	conn, err := net.Dial("tcp", "localhost:8080")
	if err != nil {
		panic(err)
	}
	defer conn.Close()

	fmt.Println("Connected to server")

	// Send a message to the server
	_, err = conn.Write([]byte("Hello from the client!\n"))
	if err != nil {
		fmt.Println("Error writing to server:", err)
		return
	}

	// Read the server's response
	reader := bufio.NewReader(conn)
	message, err := reader.ReadString('\n')
	if err != nil {
		fmt.Println("Error reading from server:", err)
		return
	}
	fmt.Println("Received from server:", message)
}