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client.go
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client.go
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package main
import (
"errors"
"fmt"
"net"
)
const PORT = 5000
type Client struct {
connections map[string]net.Conn
nick string
server bool
ui *UI
}
func CreateClient(nick string, isServer bool, ui *UI) *Client {
return &Client{
connections: make(map[string]net.Conn),
nick: nick,
server: isServer,
ui: ui}
}
// StartServer initializes the client as a server
func (this *Client) StartServer() error {
if this.server {
IP := fmt.Sprintf(":%d", PORT)
tcpAddr, err := net.ResolveTCPAddr("tcp", IP)
if err != nil {
return err
}
listener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
return err
}
for {
conn, err := listener.Accept()
if err != nil {
continue
}
go this.receive(conn)
}
} else {
return errors.New("Cannot start server as client.")
}
}
// receive continuously receive messages from a connection
func (this *Client) receive(conn net.Conn) {
for {
msg, err := readFromConn(conn)
if err != nil {
return
}
switch msg.Kind {
case MESSAGE_CONNECT:
//fmt.Printf("[*] Initializing connection to %s\n", msg.Author)
err := this.connectToPeer(msg, conn)
if err != nil {
//fmt.Printf("[*] Failed to connect to %s\n", msg.Author)
} else {
//fmt.Printf("[*] Established connection to %s\n", msg.Author)
}
case MESSAGE_PUBLIC:
// Server receives request to send message to everyone
//fmt.Printf("[*] %s said: %s\n", msg.Author, msg.Contents)
this.ui.updateMessage(msg.Author, msg.Contents)
msg.Kind = MESSAGE_SHOW
msg.Send(this.connections)
case MESSAGE_SHOW:
// Client receive request from server to show a message
this.ui.updateMessage(msg.Author, msg.Contents)
default:
continue
}
}
}
// ConnectToServer connects the server to the client
func (this *Client) connectToPeer(msg *Message, conn net.Conn) error {
this.connections[msg.Author] = conn
response := CreateMessage(MESSAGE_CONNECT, "", this.nick)
response.SendTo(conn)
return nil
}
// ConnectToServer connects the client to the server
func (this *Client) connectToServer(ip string) error {
conn, err := createConnection(ip)
if err != nil {
return err
}
msg := CreateMessage(MESSAGE_CONNECT, "", this.nick)
msg.SendTo(conn)
msg, err = readFromConn(conn)
if err != nil {
return err
}
this.connections[msg.Author] = conn
go this.receive(conn)
return nil
}
// HandleInput reads user input, encodes it as a message, and sends it
func (this *Client) handleInput(text string) {
if this.server {
// We are the server, so send the message to all peers
msg := CreateMessage(MESSAGE_SHOW, text, this.nick)
msg.Send(this.connections)
} else {
// We are a client, so send the message to the server
msg := CreateMessage(MESSAGE_PUBLIC, text, this.nick)
// TODO: Clean this up since we know there's only going to be one connection (to the server)
msg.Send(this.connections)
}
}