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annotate gara/main.go @ 93:be91a73d801a

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[MrJuneJune] Updated my website.
author June Park <parkjune1995@gmail.com>
date Fri, 02 Jan 2026 18:02:22 -0800
parents c2706ffb442b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
42
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
MrJuneJune <me@mrjunejune.com>
parents:
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1 package main
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2
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3 import (
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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4 "fmt"
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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5 "bytes"
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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6 "net"
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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7 )
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8
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9 type Client struct {
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10 name string
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11 conn net.Conn
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12 message []byte
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13 }
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14
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15 var clients map[string]Client = make(map[string]Client)
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16 var allowedCharacters = map[byte]bool{
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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17 'a': true, 'b': true, 'c': true, 'd': true, 'e': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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18 'f': true, 'g': true, 'h': true, 'i': true, 'j': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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19 'k': true, 'l': true, 'm': true, 'n': true, 'o': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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20 'p': true, 'q': true, 'r': true, 's': true, 't': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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21 'u': true, 'v': true, 'w': true, 'x': true, 'y': true, 'z': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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22 'A': true, 'B': true, 'C': true, 'D': true, 'E': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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23 'F': true, 'G': true, 'H': true, 'I': true, 'J': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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24 'K': true, 'L': true, 'M': true, 'N': true, 'O': true,
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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25 'P': true, 'Q': true, 'R': true, 'S': true, 'T': true,
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26 'U': true, 'V': true, 'W': true, 'X': true, 'Y': true, 'Z': true,
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27 }
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28
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29 func IsChacterAllowed(chars []byte) bool {
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30 for _, b := range chars {
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31 if !allowedCharacters[b] {
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32 return false
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33 }
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34 }
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35 return true
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36 }
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37
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38 func ResetClient(client Client) {
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39 ResetClientMessage(client)
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40 delete(clients, client.conn.RemoteAddr().String())
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41 client.conn.Close()
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42 }
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43
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44 func ResetClientMessage(client Client) {
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45 for i := range client.message {
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46 client.message[i] = 0
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47 }
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48 }
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49
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50 func Loggers(value string) {
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51 fmt.Println(value)
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52 }
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53
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54 func SendString(client Client, value string) {
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55 fmt.Println("Notifying User: ", client.name)
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56 client.conn.Write(([]byte)(value+"\n"))
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57 }
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58
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59 func SendToAll(currentClient Client) {
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60 for key, client := range clients {
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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61 if currentClient.conn.RemoteAddr().String() == key {
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62 continue
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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63 }
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64 formattedMessage := fmt.Sprintf("%v: %v", currentClient.name, (string)(currentClient.message))
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65 SendString(client, formattedMessage)
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66 }
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67 }
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68
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69 func HandleConnection(conn net.Conn) {
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70 client := Client{name: "unknown", conn: conn, message: make([]byte, 100)}
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71 defer ResetClient(client)
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72
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73 SendString(client, "Hello good sir. What is your name?(less than 100 character and no special characters)\n")
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74 for {
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75 _, err := conn.Read(client.message)
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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76 if err != nil {
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77 SendString(client, "Something went wrong. Try again.")
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78 continue
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79 }
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80
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81 for i := 0; i < len(client.message) - 1; i++ {
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82 if (string)(client.message[i:i+2]) == "\r\n" {
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83 client.name = (string)(client.message[:i])
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84 break;
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85 }
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86 }
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87
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88 if !IsChacterAllowed(([]byte)(client.name)) {
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89 SendString(client, "Only allow alphabets.")
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90 continue
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91 }
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92 if client.name[0] == (byte)('\r') {
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93 continue
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94 }
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95 ResetClientMessage(client)
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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96 break
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97 }
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98
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99 clients[client.conn.RemoteAddr().String()] = client
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100
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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101 // Hnadle all messages.
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102 for {
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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103 err_n := 0
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104
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105 if err_n > 10 {
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106 break;
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107 }
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108
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109 _, err := conn.Read(client.message)
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110 if err != nil {
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111 Loggers("Something went wrong")
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112 err_n += 1
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113 }
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114 if bytes.Equal(([]byte)("close"), client.message[:5]) {
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115 break
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116 } else {
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117 fmt.Println("Working....")
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118 SendToAll(client)
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119 }
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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120 }
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MrJuneJune <me@mrjunejune.com>
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121 }
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122
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123 func main() {
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124 PORT := ":4200";
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125 server_conn, err := net.Listen("tcp", PORT)
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126 fmt.Println("Running on ", server_conn.Addr().String())
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127
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128 if err != nil {
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129 Loggers("Couldn't run the server")
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130 }
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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131 for {
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132 conn, err := server_conn.Accept()
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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133 if err != nil {
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134 Loggers("Couldn't accept a client")
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135 }
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136 go HandleConnection(conn)
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137 }
c2706ffb442b [Gara] Peer to peer chat terminal app using go.
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138 }
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139