网页实时聊天之PHP实现websocket

http://www.cnblogs.com/zhenbianshu/p/6111257.html

<?php
error_reporting(E_ALL);
set_time_limit(0);// 设置超时时间为无限,防止超时
date_default_timezone_set('Asia/shanghai');

class WebSocket {
const LOG_PATH = '/tmp/';
const LISTEN_SOCKET_NUM = 9;

/**
* @var array $sockets
* [
* (int)$socket => [
* info
* ]
* ]
* todo 解释socket与file号对应
*/
private $sockets = [];
private $master;

public function __construct($host, $port) {
try {
$this->master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// 设置IP和端口重用,在重启服务器后能重新使用此端口;
socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1);
// 将IP和端口绑定在服务器socket上;
socket_bind($this->master, $host, $port);
// listen函数使用主动连接套接口变为被连接套接口，使得一个进程可以接受其它进程的请求，从而成为一个服务器进程。在TCP服务器编程中listen函数把进程变为一个服务器，并指定相应的套接字变为被动连接,其中的能存储的请求不明的socket数目。
socket_listen($this->master, self::LISTEN_SOCKET_NUM);
} catch (\Exception $e) {
$err_code = socket_last_error();
$err_msg = socket_strerror($err_code);

$this->error([
'error_init_server',
$err_code,
$err_msg
]);
}

$this->sockets[0] = ['resource' => $this->master];
// $pid = posix_getpid();
$pid = get_current_user();
$this->debug(["server: {$this->master} started,pid: {$pid}"]);

while (true) {
try {
$this->doServer();
} catch (\Exception $e) {
$this->error([
'error_do_server',
$e->getCode(),
$e->getMessage()
]);
}
}
}

private function doServer() {
$write = $except = NULL;
$sockets = array_column($this->sockets, 'resource');
$read_num = socket_select($sockets, $write, $except, NULL);
// select作为监视函数,参数分别是(监视可读,可写,异常,超时时间),返回可操作数目,出错时返回false;
if (false === $read_num) {
$this->error([
'error_select',
$err_code = socket_last_error(),
socket_strerror($err_code)
]);
return;
}

foreach ($sockets as $socket) {
// 如果可读的是服务器socket,则处理连接逻辑
if ($socket == $this->master) {
$client = socket_accept($this->master);
// 创建,绑定,监听后accept函数将会接受socket要来的连接,一旦有一个连接成功,将会返回一个新的socket资源用以交互,如果是一个多个连接的队列,只会处理第一个,如果没有连接的话,进程将会被阻塞,直到连接上.如果用set_socket_blocking或socket_set_noblock()设置了阻塞,会返回false;返回资源后,将会持续等待连接。
if (false === $client) {
$this->error([
'err_accept',
$err_code = socket_last_error(),
socket_strerror($err_code)
]);
continue;
} else {
self::connect($client);
continue;
}
} else {
// 如果可读的是其他已连接socket,则读取其数据,并处理应答逻辑
$bytes = @socket_recv($socket, $buffer, 2048, 0);
if ($bytes < 9) {
$recv_msg = $this->disconnect($socket);
} else {
if (!$this->sockets[(int)$socket]['handshake']) {
self::handShake($socket, $buffer);
continue;
} else {
$recv_msg = self::parse($buffer);
}
}
array_unshift($recv_msg, 'receive_msg');
$msg = self::dealMsg($socket, $recv_msg);

$this->broadcast($msg);
}
}
}

/**
* 将socket添加到已连接列表,但握手状态留空;
*
* @param $socket
*/
public function connect($socket) {
socket_getpeername($socket, $ip, $port);
$socket_info = [
'resource' => $socket,
'uname' => '',
'handshake' => false,
'ip' => $ip,
'port' => $port,
];
$this->sockets[(int)$socket] = $socket_info;
$this->debug(array_merge(['socket_connect'], $socket_info));
}

/**
* 客户端关闭连接
*
* @param $socket
*
* @return array
*/
private function disconnect($socket) {
$recv_msg = [
'type' => 'logout',
'content' => $this->sockets[(int)$socket]['uname'],
];
unset($this->sockets[(int)$socket]);

return $recv_msg;
}

/**
* 用公共握手算法握手
*
* @param $socket
* @param $buffer
*
* @return bool
*/
public function handShake($socket, $buffer) {
// 获取到客户端的升级密匙
$line_with_key = substr($buffer, strpos($buffer, 'Sec-WebSocket-Key:') + 18);
$key = trim(substr($line_with_key, 0, strpos($line_with_key, "\r\n")));

// 生成升级密匙,并拼接websocket升级头
$upgrade_key = base64_encode(sha1($key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true));// 升级key的算法
$upgrade_message = "HTTP/1.1 101 Switching Protocols\r\n";
$upgrade_message .= "Upgrade: websocket\r\n";
$upgrade_message .= "Sec-WebSocket-Version: 13\r\n";
$upgrade_message .= "Connection: Upgrade\r\n";
$upgrade_message .= "Sec-WebSocket-Accept:" . $upgrade_key . "\r\n\r\n";

socket_write($socket, $upgrade_message, strlen($upgrade_message));// 向socket里写入升级信息
$this->sockets[(int)$socket]['handshake'] = true;

socket_getpeername($socket, $ip, $port);
$this->debug([
'hand_shake',
$socket,
$ip,
$port
]);

// 向客户端发送握手成功消息,以触发客户端发送用户名动作;
$msg = [
'type' => 'handshake',
'content' => 'done',
];
$msg = $this->build(json_encode($msg));
socket_write($socket, $msg, strlen($msg));
return true;
}

/**
* 解析数据
*
* @param $buffer
*
* @return bool|string
*/
private function parse($buffer) {
$decoded = '';
$len = ord($buffer[1]) & 127;
if ($len === 126) {
$masks = substr($buffer, 4, 4);
$data = substr($buffer, 8);
} else if ($len === 127) {
$masks = substr($buffer, 10, 4);
$data = substr($buffer, 14);
} else {
$masks = substr($buffer, 2, 4);
$data = substr($buffer, 6);
}
for ($index = 0; $index < strlen($data); $index++) {
$decoded .= $data[$index] ^ $masks[$index % 4];
}

return json_decode($decoded, true);
}

/**
* 将普通信息组装成websocket数据帧
*
* @param $msg
*
* @return string
*/
private function build($msg) {
$frame = [];
$frame[0] = '81';
$len = strlen($msg);
if ($len < 126) {
$frame[1] = $len < 16 ? '0' . dechex($len) : dechex($len);
} else if ($len < 65025) {
$s = dechex($len);
$frame[1] = '7e' . str_repeat('0', 4 - strlen($s)) . $s;
} else {
$s = dechex($len);
$frame[1] = '7f' . str_repeat('0', 16 - strlen($s)) . $s;
}

$data = '';
$l = strlen($msg);
for ($i = 0; $i < $l; $i++) {
$data .= dechex(ord($msg{$i}));
}
$frame[2] = $data;

$data = implode('', $frame);

return pa
4000
ck("H*", $data);
}

/**
* 拼装信息
*
* @param $socket
* @param $recv_msg
* [
* 'type'=>user/login
* 'content'=>content
* ]
*
* @return string
*/
private function dealMsg($socket, $recv_msg) {
$msg_type = $recv_msg['type'];
$msg_content = $recv_msg['content'];
$response = [];

switch ($msg_type) {
case 'login':
$this->sockets[(int)$socket]['uname'] = $msg_content;
// 取得最新的名字记录
$user_list = array_column($this->sockets, 'uname');
$response['type'] = 'login';
$response['content'] = $msg_content;
$response['user_list'] = $user_list;
break;
case 'logout':
$user_list = array_column($this->sockets, 'uname');
$response['type'] = 'logout';
$response['content'] = $msg_content;
$response['user_list'] = $user_list;
break;
case 'user':
$uname = $this->sockets[(int)$socket]['uname'];
$response['type'] = 'user';
$response['from'] = $uname;
$response['content'] = $msg_content;
break;
}

return $this->build(json_encode($response));
}

/**
* 广播消息
*
* @param $data
*/
private function broadcast($data) {
foreach ($this->sockets as $socket) {
if ($socket['resource'] == $this->master) {
continue;
}
socket_write($socket['resource'], $data, strlen($data));
}
}

/**
* 记录debug信息
*
* @param array $info
*/
private function debug(array $info) {
$time = date('Y-m-d H:i:s');
array_unshift($info, $time);

$info = array_map('json_encode', $info);
file_put_contents(self::LOG_PATH . 'websocket_debug.log', implode(' | ', $info) . "\r\n", FILE_APPEND);
}

/**
* 记录错误信息
*
* @param array $info
*/
private function error(array $info) {
$time = date('Y-m-d H:i:s');
array_unshift($info, $time);

$info = array_map('json_encode', $info);
file_put_contents(self::LOG_PATH . 'websocket_error.log', implode(' | ', $info) . "\r\n", FILE_APPEND);
}
}

$ws = new WebSocket("127.0.0.1", "8080");

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<style>
p {
text-align: left;
padding-left: 20px;
}
</style>
</head>
<body>
<div style="width: 800px;height: 600px;margin: 30px auto;text-align: center">
<h1>websocket聊天室</h1>
<div style="width: 800px;border: 1px solid gray;height: 300px;">
<div style="width: 200px;height: 300px;float: left;text-align: left;">
<p><span>当前在线:</span><span id="user_num">0</span></p>
<div id="user_list" style="overflow: auto;">

</div>
</div>
<div id="msg_list" style="width: 598px;border:  1px solid gray; height: 300px;overflow: scroll;float: left;">
</div>
</div>
<br>
<textarea id="msg_box" rows="6" cols="50" onkeydown="confirm(event)"></textarea><br>
<input type="button" value="发送" onclick="send()">
</div>
</body>
</html>

<script type="text/javascript">
// 存储用户名到全局变量,握手成功后发送给服务器
var uname = prompt('请输入用户名', 'user' + uuid(8, 16));
var ws = new WebSocket("ws://127.0.0.1:8080");
ws.onopen = function () {
var data = "系统消息：建立连接成功";
listMsg(data);
};

/**
* 分析服务器返回信息
*
* msg.type : user 普通信息;system 系统信息;handshake 握手信息;login 登陆信息; logout 退出信息;
* msg.from : 消息来源
* msg.content: 消息内容
*/
ws.onmessage = function (e) {
var msg = JSON.parse(e.data);
var sender, user_name, name_list, change_type;

switch (msg.type) {
case 'system':
sender = '系统消息: ';
break;
case 'user':
sender = msg.from + ': ';
break;
case 'handshake':
var user_info = {'type': 'login', 'content': uname};
sendMsg(user_info);
return;
case 'login':
case 'logout':
user_name = msg.content;
name_list = msg.user_list;
change_type = msg.type;
dealUser(user_name, change_type, name_list);
return;
}

var data = sender + msg.content;
listMsg(data);
};

ws.onerror = function () {
var data = "系统消息 : 出错了,请退出重试.";
listMsg(data);
};

/**
* 在输入框内按下回车键时发送消息
*
* @param event
*
* @returns {boolean}
*/
function confirm(event) {
var key_num = event.keyCode;
if (13 == key_num) {
send();
} else {
return false;
}
}

/**
* 发送并清空消息输入框内的消息
*/
function send() {
var msg_box = document.getElementById("msg_box");
var content = msg_box.value;
var reg = new RegExp("\r\n", "g");
content = content.replace(reg, "");
var msg = {'content': content.trim(), 'type': 'user'};
sendMsg(msg);
msg_box.value = '';
// todo 清除换行符
}

/**
* 将消息内容添加到输出框中,并将滚动条滚动到最下方
*/
function listMsg(data) {
var msg_list = document.getElementById("msg_list");
var msg = document.createElement("p");

msg.innerHTML = data;
msg_list.appendChild(msg);
msg_list.scrollTop = msg_list.scrollHeight;
}

/**
* 处理用户登陆消息
*
* @param user_name 用户名
* @param type  login/logout
* @param name_list 用户列表
*/
function dealUser(user_name, type, name_list) {
var user_list = document.getElementById("user_list");
var user_num = document.getElementById("user_num");
while(user_list.hasChildNodes()) {
user_list.removeChild(user_list.firstChild);
}

for (var index in name_list) {
var user = document.createElement("p");
user.innerHTML = name_list[index];
user_list.appendChild(user);
}
user_num.innerHTML = name_list.length;
user_list.scrollTop = user_list.scrollHeight;

var change = type == 'login' ? '上线' : '下线';

var data = '系统消息: ' + user_name + ' 已' + change;
listMsg(data);
}

/**
* 将数据转为json并发送
* @param msg
*/
function sendMsg(msg) {
var data = JSON.stringify(msg);
ws.send(data);
}

/**
* 生产一个全局唯一ID作为用户名的默认值;
*
* @param len
* @param radix
* @returns {string}
*/
function uuid(len, radix) {
var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
var uuid = [], i;
radix = radix || chars.length;

if (len) {
for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
} else {
var r;

uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
uuid[14] = '4';

for (i = 0; i < 36; i++) {
if (!uuid[i]) {
r = 0 | Math.random() * 16;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
}

return uuid.join('');
}
</script>