概述

主要参考官方的这两篇文章,进行实现的Demo。

网络通信协议设计:

https://wiki.swoole.com/wiki/page/484.html

多端口监听的使用:

https://wiki.swoole.com/wiki/page/161.html

希望通过我提供的Demo,能够对文档有更加深刻的理解。

网络通信协议设计

为什么需要通信协议?

官方:TCP协议在底层机制上解决了UDP协议的顺序和丢包重传问题。但相比UDP又带来了新的问题,TCP协议是流式的,数据包没有边界。应用程序使用TCP通信就会面临这些难题。因为TCP通信是流式的,在接收1个大数据包时,可能会被拆分成多个数据包发送。多次Send底层也可能会合并成一次进行发送。这里就需要2个操作来解决:分包和合包,所以TCP网络通信时需要设定通信协议。

Swoole支持了2种类型的自定义网络通信协议:EOF结束符协议、固定包头+包体协议。

EOF结束符协议

先看下,未设置协议的效果:

发送的每条数据长度都是 23,但在 onReceive 接收数据的时候每次接收的长度不一样,并没有按照想象的方式进行分包。

再看下,设置了EOF结束符协议的效果:

发送的每条数据长度都是 23,在 onReceive 接收数据的时候每次接收的也是 23 ,完美。

主要设置项如下:

'package_max_length' => '8192',
'open_eof_split' => true,
package_eof' => "\r\n"

不做解释,官方文档已经写的很清楚。

示例代码如下:

server.php

<?php

class Server
{
private $serv;

public function __construct() {
$this->serv = new swoole_server('0.0.0.0', 9501);
$this->serv->set([
'worker_num' => 2, //开启2个worker进程
'max_request' => 4, //每个worker进程 max_request设置为4次
'dispatch_mode' => 2, //数据包分发策略 - 固定模式

//EOF结束符协议
'package_max_length' => '8192',
'open_eof_split' => true,
'package_eof' => "\r\n"
]);

$this->serv->on('Start', [$this, 'onStart']);
$this->serv->on('Connect', [$this, 'onConnect']);
$this->serv->on("Receive", [$this, 'onReceive']);
$this->serv->on("Close", [$this, 'onClose']);

$this->serv->start();
}

public function onStart($serv) {
echo "#### onStart ####".PHP_EOL;
echo "SWOOLE ".SWOOLE_VERSION . " 服务已启动".PHP_EOL;
echo "swoole_cpu_num:".swoole_cpu_num().PHP_EOL;
echo "master_pid: {$serv->master_pid}".PHP_EOL;
echo "manager_pid: {$serv->manager_pid}".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}

public function onConnect($serv, $fd) {
echo "#### onConnect ####".PHP_EOL;
echo "客户端:".$fd." 已连接".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}

public function onReceive($serv, $fd, $from_id, $data) {
echo "#### onReceive ####".PHP_EOL;
var_dump($data);
}

public function onClose($serv, $fd) {
echo "Client Close.".PHP_EOL;
}
}

$server = new Server();

client.php

<?php
class Client
{
private $client;
public function __construct() {
$this->client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
$this->client->on('Connect', [$this, 'onConnect']);
$this->client->on('Close', [$this, 'onClose']);
$this->client->on('Error', [$this, 'onError']);
}
public function connect() {
if(!$fp = $this->client->connect("127.0.0.1", 9501)) {
echo "Error: {$fp->errMsg}[{$fp->errCode}]".PHP_EOL;
return;
}
}
public function onConnect() {
fwrite(STDOUT, "发送测试数据(Y or N):");
swoole_event_add(STDIN, function() {
$msg = trim(fgets(STDIN));
if ($msg == 'y') {
$this->send();
}
fwrite(STDOUT, "发送测试数据(Y or N):");
});
}
public function send() {
$msg_info = "客户端发信息...\r\n";
$i = 0;
while ($i < 50) {
var_dump($msg_info);
$this->client->send($msg_info);
$i++;
}
}
public function onClose() {
echo "Client close connection".PHP_EOL;
}
public function onError() {
}
}
$client = new Client();
$client->connect();

固定包头+包体协议



先看下,未设置协议的效果:

很明显,在 onReceive 接收到的数据,是少的。

再看下,设置协议的效果:

主要设置项如下:

'open_length_check' => true,
'package_max_length' => '8192',
'package_length_type' => 'N',
'package_length_offset' => '0',
'package_body_offset' => '4',

不做解释,官方文档已经写的很清楚。

示例代码如下:

server.php

<?php
class Server
{
private $serv;
public function __construct() {
$this->serv = new swoole_server('0.0.0.0', 9501);
$this->serv->set([
'worker_num' => 2, //开启2个worker进程
'max_request' => 4, //每个worker进程 max_request设置为4次
'dispatch_mode' => 2, //数据包分发策略 - 固定模式
//固定包头+包体协议
'open_length_check' => true,
'package_max_length' => '8192',
'package_length_type' => 'N',
'package_length_offset' => '0',
'package_body_offset' => '4',
]);
$this->serv->on('Start', [$this, 'onStart']);
$this->serv->on('Connect', [$this, 'onConnect']);
$this->serv->on("Receive", [$this, 'onReceive']);
$this->serv->on("Close", [$this, 'onClose']);
$this->serv->start();
}
public function onStart($serv) {
echo "#### onStart ####".PHP_EOL;
echo "swoole_cpu_num:".swoole_cpu_num().PHP_EOL;
echo "SWOOLE ".SWOOLE_VERSION . " 服务已启动".PHP_EOL;
echo "master_pid: {$serv->master_pid}".PHP_EOL;
echo "manager_pid: {$serv->manager_pid}".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}
public function onConnect($serv, $fd) {
echo "#### onConnect ####".PHP_EOL;
echo "客户端:".$fd." 已连接".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}
public function onReceive($serv, $fd, $from_id, $data) {
echo "#### onReceive ####".PHP_EOL;
$length = unpack('N', $data)[1];
echo "Length:".$length.PHP_EOL;
$msg = substr($data, -$length);
echo "Msg:".$msg.PHP_EOL;
}
public function onClose($serv, $fd) {
echo "Client Close.".PHP_EOL;
}
}
$server = new Server();

client.php

<?php
class Client
{
private $client;
public function __construct() {
$this->client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
$this->client->on('Connect', [$this, 'onConnect']);
$this->client->on('Close', [$this, 'onClose']);
$this->client->on('Error', [$this, 'onError']);
}
public function connect() {
if(!$fp = $this->client->connect("127.0.0.1", 9501, 1)) {
echo "Error: {$fp->errMsg}[{$fp->errCode}]".PHP_EOL;
return;
}
}
public function onConnect() {
fwrite(STDOUT, "发送测试数据(Y or N):");
swoole_event_add(STDIN, function() {
$msg = trim(fgets(STDIN));
if ($msg == 'y') {
$this->send();
}
fwrite(STDOUT, "发送测试数据(Y or N):");
});
}
public function send() {
$msg = '客户端发的信息...';
$msg_info = pack('N', strlen($msg)).$msg;
$i = 0;
while ($i < 50) {
var_dump($msg_info);
$this->client->send($msg_info);
$i++;
}
}
public function onClose() {
echo "Client close connection".PHP_EOL;
}
public function onError() {
}
}
$client = new Client();
$client->connect();


多端口监听的使用


上图,是示例代码中的端口监听:

9501 onMessage 处理 WebSocket。

9501 onRequest 处理 HTTP。

9502 onReceive 处理 TCP。

9503 onPacket 处理 UDP。

不多说,看下效果图:


示例代码如下:

server.php

<?php

class Server
{
private $serv;

public function __construct() {
$this->serv = new swoole_websocket_server("0.0.0.0", 9501);
$this->serv->set([
'worker_num' => 2, //开启2个worker进程
'max_request' => 4, //每个worker进程 max_request设置为4次
'task_worker_num' => 4, //开启4个task进程
'dispatch_mode' => 4, //数据包分发策略 - IP分配
'daemonize' => false, //守护进程(true/false)
]);

$this->serv->on('Start', [$this, 'onStart']);
$this->serv->on('Open', [$this, 'onOpen']);
$this->serv->on("Message", [$this, 'onMessage']);
$this->serv->on("Request", [$this, 'onRequest']);
$this->serv->on("Close", [$this, 'onClose']);
$this->serv->on("Task", [$this, 'onTask']);
$this->serv->on("Finish", [$this, 'onFinish']);

//监听 9502 端口
$tcp = $this->serv->listen("0.0.0.0", 9502, SWOOLE_SOCK_TCP);
$tcp->set([
'worker_num' => 2, //开启2个worker进程
'max_request' => 4, //每个worker进程 max_request设置为4次
'dispatch_mode' => 2, //数据包分发策略 - 固定模式

//固定包头+包体协议
'open_length_check' => true,
'package_max_length' => '8192',
'package_length_type' => 'N',
'package_length_offset' => '0',
'package_body_offset' => '4',
]);
$tcp->on("Receive", [$this, 'onReceive']);

//监听 9503 端口
$udp = $this->serv->listen("0.0.0.0", 9503, SWOOLE_SOCK_UDP);
$udp->set([
'worker_num' => 2, //开启2个worker进程
'max_request' => 4, //每个worker进程 max_request设置为4次
'dispatch_mode' => 2, //数据包分发策略 - 固定模式
]);
$udp->on("Packet", [$this, 'onPacket']);

$this->serv->start();
}

public function onStart($serv) {
echo "#### onStart ####".PHP_EOL;
echo "SWOOLE ".SWOOLE_VERSION . " 服务已启动".PHP_EOL;
echo "master_pid: {$serv->master_pid}".PHP_EOL;
echo "manager_pid: {$serv->manager_pid}".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}

public function onOpen($serv, $request) {
echo "#### onOpen ####".PHP_EOL;
echo "server: handshake success with fd{$request->fd}".PHP_EOL;
$serv->task([
'type' => 'login'
]);
echo "########".PHP_EOL.PHP_EOL;
}

public function onTask($serv, $task_id, $from_id, $data) {
echo "#### onTask ####".PHP_EOL;
echo "#{$serv->worker_id} onTask: [PID={$serv->worker_pid}]: task_id={$task_id}".PHP_EOL;
$msg = '';
switch ($data['type']) {
case 'login':
$msg = '我来了...';
break;
case 'speak':
$msg = $data['msg'];
break;
}
foreach ($serv->connections as $fd) {
$connectionInfo = $serv->connection_info($fd);
if (isset($connectionInfo['websocket_status']) && $connectionInfo['websocket_status'] == 3) {
$serv->push($fd, $msg); //长度最大不得超过2M
}
}
$serv->finish($data);
echo "########".PHP_EOL.PHP_EOL;
}

public function onFinish($serv,$task_id, $data) {
echo "#### onFinish ####".PHP_EOL;
echo "Task {$task_id} 已完成".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}

public function onClose($serv, $fd) {
echo "#### onClose ####".PHP_EOL;
echo "client {$fd} closed".PHP_EOL;
echo "########".PHP_EOL.PHP_EOL;
}

public function onMessage($serv, $frame) {
echo "#### onMessage ####".PHP_EOL;
echo "receive from fd{$frame->fd}:{$frame->data},opcode:{$frame->opcode},fin:{$frame->finish}".PHP_EOL;
$serv->task(['type' => 'speak', 'msg' => $frame->data]);
echo "########".PHP_EOL.PHP_EOL;
}

public function onRequest($request, $response) {
echo "#### onRequest ####".PHP_EOL;
$response->header("Content-Type", "text/html; charset=utf-8");
$server = $request->server;
$path_info = $server['path_info'];
$request_uri = $server['request_uri'];

echo "PATH_INFO:".$path_info.PHP_EOL;

if ($path_info == '/favicon.ico' || $request_uri == '/favicon.ico') {
return $response->end();
}

$html = "<h1>你好 Swoole.</h1>";
$response->end($html);
}

public function onReceive($serv, $fd, $from_id, $data) {
echo "#### onReceive ####".PHP_EOL;

$length = unpack('N', $data)[1];
echo "Length:".$length.PHP_EOL;
$msg = substr($data, -$length);
echo "Msg:".$msg.PHP_EOL;
}

public function onPacket($serv, $data, $clientInfo) {
echo "#### onPacket ####".PHP_EOL;
$serv->sendto($clientInfo['address'], $clientInfo['port'], "Server ".$data);
var_dump($clientInfo);
}
}

$server = new Server();

4 个客户端连接的代码分别是:

1、9501 onMessage 处理 WebSocket。可以参考原来文章 Swoole WebSocket 的应用 中的代码即可。

2、9501 onRequest 处理 HTTP。可以参考原来文章 Swoole HTTP 的应用 中的代码即可。

3、9502 onReceive 处理 TCP。可以参考原来文章 Swoole Task 的应用 中的代码即可。

4、9503 onPacket 处理 UDP。

示例代码:

netcat -u 10.211.55.4 9503

小结
一、多端口的应用场景是什么?

比如,开发一个直播网站,直播用一个端口,IM聊天用一个端口。

比如,开发一个RPC服务,数据通讯用一个端口,统计界面用一个端口。