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annotate gara/main.go @ 71:75de5903355c

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Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
author June Park <parkjune1995@gmail.com>
date Sun, 28 Dec 2025 20:34:22 -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.
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1 package main
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2
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3 import (
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4 "fmt"
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5 "bytes"
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6 "net"
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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,
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19 'k': true, 'l': true, 'm': true, 'n': true, 'o': true,
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20 'p': true, 'q': true, 'r': true, 's': true, 't': true,
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21 'u': true, 'v': true, 'w': true, 'x': true, 'y': true, 'z': true,
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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,
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24 'K': true, 'L': true, 'M': true, 'N': true, 'O': true,
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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 {
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61 if currentClient.conn.RemoteAddr().String() == key {
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62 continue
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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)
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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)
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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
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101 // Hnadle all messages.
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102 for {
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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 }
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120 }
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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 }
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131 for {
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132 conn, err := server_conn.Accept()
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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 }
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138 }
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139