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php实现socket推送技术

2018-06-22 05:33:13来源：未知阅读 ()

在socket出现之前已经有ajax定时请求、长轮询等方案，但都不能满足需求，socket就应用而生了。

socket基本函数socket

总结下常用的socket函数

服务端： socket_create 创建socket设置基本参数

　　　　 socket_bind 绑定ip和端口号

　　　　 socket_listen 监听

　　　　 socket_accept 客户端的连接

　　　　 socket_read 读取客户端的数据

　　　　 socket_write 给单独客户端发送数据

　　　　 socket_close 关闭连接

客户端：socket_create 创建socket设置基本参数

　　　　 socket_connect 连接socket

　　　　 socket_write 给服务端发送数据

　　　　 socket_read 读取服务端数据

　　　　 socket_close 关闭连接

H5websocket不多说了，上链接

OK，开始贴代码~

----------------------------------------------------------分割线

服务端代码：

  1 <?php
  2 class WS {
  3     var $master;
  4     var $sockets = array();
  5     var $debug = false;//true为调试模式，输出log日志
  6     var $handshake = array();
  7 
  8     function __construct($address, $port){
  9         $this->master=socket_create(AF_INET, SOCK_STREAM, SOL_TCP)     or die("socket_create() failed");
 10         socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1)  or die("socket_option() failed");
 11         socket_bind($this->master, $address, $port)                    or die("socket_bind() failed");
 12         socket_listen($this->master,20)                                or die("socket_listen() failed");
 13         
 14         $this->sockets[] = $this->master;
 15         $this->say("Server Started : ".date('Y-m-d H:i:s'));
 16         $this->say("Listening on   : ".$address." port ".$port);
 17         $this->say("Master socket  : ".$this->master."\n");
 18         
 19         while(true){
 20             $socketArr = $this->sockets;
 21             $write = NULL;
 22             $except = NULL;
 23             socket_select($socketArr, $write, $except, NULL);  //自动选择来消息的socket 如果是握手 自动选择主机
 24             foreach ($socketArr as $socket){
 25                 if ($socket == $this->master){  //主机
 26                     $client = socket_accept($this->master);
 27                     if ($client < 0){
 28                         $this->log("socket_accept() failed");
 29                         continue;
 30                     } else{
 31                         $this->connect($client);
 32                     }
 33                 } else {
 34                     $bytes = @socket_recv($socket,$buffer,2048,0);
 35                     if ($bytes == 0){
 36                         $this->disConnect($socket);
 37                     }
 38                     else{
 39                         $key = array_search($socket, $this->sockets);
 40                         if (empty($this->handshake) || !isset($this->handshake[$key]) || !$this->handshake[$key]){
 41                             $this->doHandShake($socket, $buffer, $key);
 42                         }
 43                         else{
 44                             $buffer = $this->decode($buffer);
 45                             echo $buffer.PHP_EOL;
 46                             $key = array_search($socket, $this->sockets);
 47                             $arr = $this->sockets;
 48                             array_shift($arr);
 49                             foreach ($arr as $s){
 50                                 $this->send($s, $buffer);
 51                             }
 52                         }
 53                     }
 54                 }
 55             }
 56         }
 57     }
 58     
 59     function send($client, $msg){
 60         $msg = $this->frame($msg);
 61         socket_write($client, $msg, strlen($msg));
 62     }
 63     function connect($socket){
 64         array_push($this->sockets, $socket);
 65         $this->say("\n" . $socket . " CONNECTED!");
 66         $this->say(date("Y-n-d H:i:s"));
 67     }
 68     function disConnect($socket){
 69         $index = array_search($socket, $this->sockets);
 70         socket_close($socket);
 71         $this->say($socket . " DISCONNECTED!");
 72         if ($index >= 0){
 73             echo 'unset index is:'.PHP_EOL;
 74             unset($this->sockets[$index]);
 75         }
 76     }
 77     function doHandShake($socket, $buffer, $handKey){
 78         $this->log("\nRequesting handshake...");
 79         $this->log($buffer);
 80         list($resource, $host, $origin, $key) = $this->getHeaders($buffer);
 81         $this->log("Handshaking...");
 82         $upgrade  = "HTTP/1.1 101 Switching Protocol\r\n" .
 83                     "Upgrade: websocket\r\n" .
 84                     "Connection: Upgrade\r\n" .
 85                     "Sec-WebSocket-Accept: " . $this->calcKey($key) . "\r\n\r\n";  //必须以两个回车结尾
 86         $this->log($upgrade);
 87         $sent = socket_write($socket, $upgrade, strlen($upgrade));
 88         $this->handshake[$handKey]=true;
 89         $this->log("Done handshaking...");
 90         return true;
 91     }
 92 
 93     function getHeaders($req){
 94         $r = $h = $o = $key = null;
 95         if (preg_match("/GET (.*) HTTP/"              ,$req,$match)) { $r = $match[1]; }
 96         if (preg_match("/Host: (.*)\r\n/"             ,$req,$match)) { $h = $match[1]; }
 97         if (preg_match("/Origin: (.*)\r\n/"           ,$req,$match)) { $o = $match[1]; }
 98         if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/",$req,$match)) { $key = $match[1]; }
 99         return array($r, $h, $o, $key);
100     }
101 
102     function calcKey($key){
103         //基于websocket version 13
104         $accept = base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
105         return $accept;
106     }
107 
108     function decode($buffer) {
109         $len = $masks = $data = $decoded = null;
110         $len = ord($buffer[1]) & 127;
111 
112         if ($len === 126) {
113             $masks = substr($buffer, 4, 4);
114             $data = substr($buffer, 8);
115         } 
116         else if ($len === 127) {
117             $masks = substr($buffer, 10, 4);
118             $data = substr($buffer, 14);
119         } 
120         else {
121             $masks = substr($buffer, 2, 4);
122             $data = substr($buffer, 6);
123         }
124         for ($index = 0; $index < strlen($data); $index++) {
125             $decoded .= $data[$index] ^ $masks[$index % 4];
126         }
127         return $decoded;
128     }
129 
130     function frame($s){
131         $a = str_split($s, 125);
132         if (count($a) == 1){
133             return "\x81" . chr(strlen($a[0])) . $a[0];
134         }
135         $ns = "";
136         foreach ($a as $o){
137             $ns .= "\x81" . chr(strlen($o)) . $o;
138         }
139         return $ns;
140     }
141 
142     
143     function say($msg = ""){
144         echo $msg . "\n";
145     }
146     function log($msg = ""){
147         if ($this->debug){
148             echo $msg . "\n";
149         } 
150     }
151 }
152     
153 
154 new WS('localhost', 4000);

客户端代码（H5）：

 1 <html>
 2     <head>
 3         <title>demo</title>
 4         <script src="https://cdn.bootcss.com/jquery/1.9.1/jquery.min.js"></script>
 5     </head>
 6     <body>
 7     <input type="text" id="content">
 8     <input type="button" value="send" id="send">
 9         <script type="text/javascript">
10             var ws = new WebSocket("ws://localhost:4000");
11             ws.onopen = function(){
12                 console.log("握手成功");
13             }
14             ws.onmessage = function(e){
15                 console.log("message:" + e.data);
16             }
17             ws.onerror = function(){
18                 console.log("error");
19             }
20             $("#send").click(function(){
21                 content = $("#content").val();
22                 console.log(content);
23                 ws.send(content);
24             })
25         </script>
26     </body>
27 </html>