Swoole v4.6 版本新特性之 Http\Request 增强

在 4.6 版本中，对 Swoole\Http\Request 进行了一些增强：

1. 新增 create/parse/isCompleted 方法 (#3938) (@matyhtf)
2. 新增 getMethod 方法 (#3987) (@luolaifa000)

那么这些增强功能有什么用呢？这里举一个例子：

使用 TCP Server，提供 HTTP Server 的访问

在没有这些方法之前，需要手动将 onReceive 事件中收到的 $data 数据解析为 HTTP 协议

$server->on('Receive', function ($server, $fd, $reactor_id, $data) {
    $server->send($fd, "Server: {$data}");
});

现在就不需要手动进行解析 HTTP 协议了，可以直接使用 Swoole 提供的方法进行解析，返回的数据格式和 Http\Server 中的 Http\Request 完全一致

下面来试一下：

本文使用 Swoole v4.6.2 版本进行演示。

create/parse

use Swoole\Server;
use Swoole\Http\Request;

$server = new Server('127.0.0.1', 9501);

$server->on('Receive', function (Server $server, $fd, $reactor_id, $data) {
    /** @var Request $request */
    $request = Request::create();
    $request->parse($data);
    var_dump($request);

    $body = 'Hello, Swoole';
    $body_len = strlen($body);
    $send_data = "HTTP/1.1 200 OK\r\nServer: swoole-server\r\nContent-Type: text/html;charset=utf-8\r\nContent-Length: {$body_len}\r\nConnection: keep-alive\r\n\r\n{$body}";
    $server->send($fd, $send_data);
});

$server->start();

在 Swoole\Server TCP 服务器的 onReceive 事件中，调用Request::create()方法来创建一个 Http\Request 对象，接着将$data数据传递给Request->parse方法进行解析，打印$request

使用浏览器或者 curl 发起请求，如http://127.0.0.1:9501/?foo=bar

输出结果和 Swoole\Http\Server HTTP 服务器的 $request 结果一致

object(Swoole\Http\Request)#6 (9) {
  ["fd"]=>
  int(0)
  ["streamId"]=>
  int(0)
  ["header"]=>
  array(14) {
    ["host"]=>
    string(14) "127.0.0.1:9501"
    ["connection"]=>
    string(10) "keep-alive"
    ["sec-ch-ua"]=>
    string(64) ""Chromium";v="88", "Google Chrome";v="88", ";Not A Brand";v="99""
    ["sec-ch-ua-mobile"]=>
    string(2) "?0"
    ["dnt"]=>
    string(1) "1"
    ["upgrade-insecure-requests"]=>
    string(1) "1"
    ["user-agent"]=>
    string(120) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36"
    ["accept"]=>
    string(135) "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"
    ["sec-fetch-site"]=>
    string(4) "none"
    ["sec-fetch-mode"]=>
    string(8) "navigate"
    ["sec-fetch-user"]=>
    string(2) "?1"
    ["sec-fetch-dest"]=>
    string(8) "document"
    ["accept-encoding"]=>
    string(17) "gzip, deflate, br"
    ["accept-language"]=>
    string(14) "zh-CN,zh;q=0.9"
  }
  ["server"]=>
  array(7) {
    ["query_string"]=>
    string(7) "foo=bar"
    ["request_method"]=>
    string(3) "GET"
    ["request_uri"]=>
    string(1) "/"
    ["path_info"]=>
    string(1) "/"
    ["request_time"]=>
    int(1612413945)
    ["request_time_float"]=>
    float(1612413945.3474)
    ["server_protocol"]=>
    string(8) "HTTP/1.1"
  }
  ["cookie"]=>
  NULL
  ["get"]=>
  array(1) {
    ["foo"]=>
    string(3) "bar"
  }
  ["files"]=>
  NULL
  ["post"]=>
  NULL
  ["tmpfiles"]=>
  NULL
}

调用send方法发送response，并且浏览器还正常输出了Hello, Swoole

$body = 'Hello, Swoole';
$body_len = strlen($body);
$send_data = "HTTP/1.1 200 OK\r\nServer: swoole-server\r\nContent-Type: text/html;charset=utf-8\r\nContent-Length: {$body_len}\r\nConnection: keep-alive\r\n\r\n{$body}";
$server->send($fd, $send_data);

这里就需要了解 HTTP 协议，包括响应头信息、状态码等

getMethod

新增的getMethod方法和$request->server['request_method']方法结果一致，都是用来获取当前的 HTTP 请求的请求方式。

var_dump($request->server['request_method']);
var_dump($request->getMethod());

isCompleted

我们有这样一段 HTTP 请求报文：

GET / HTTP/1.1\r\n
Host: 127.0.0.1:9501\r\n
Connection: keep-alive\r\n
Cache-Control: max-age=0\r\n
DNT: 1\r\n
Upgrade-Insecure-Requests: 1\r\n
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36\r\n
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9\r\n
Sec-Fetch-Site: none\r\n
Sec-Fetch-Mode: navigate\r\n
Sec-Fetch-User: ?1\r\n
Sec-Fetch-Dest: document\r\n
Accept-Encoding: gzip, deflate, br\r\n
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8\r\n
Cookie: PHPSESSID=679eca30f8e96dcb3ad4ff82ceb62079\r\n
\r\n

HTTP 协议使用两个\r\n表示消息报头已经结束，代码中怎么去判断是否到达了结尾？

这里就可以使用isCompleted方法，如：

use Swoole\Http\Request;

$data = "GET /?foo=bar HTTP/1.1\r\n";
$data .= "Host: 127.0.0.1:9501\r\n";
$data .= "Connection: keep-alive\r\n";
$data .= "Cache-Control: max-age=0\r\n";
$data .= "DNT: 1\r\n";
$data .= "Upgrade-Insecure-Requests: 1\r\n";
$data .= "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36\r\n";
$data .= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9\r\n";
$data .= "Sec-Fetch-Site: none\r\n";
$data .= "Sec-Fetch-Mode: navigate\r\n";
$data .= "Sec-Fetch-User: ?1\r\n";
$data .= "Sec-Fetch-Dest: document\r\n";
$data .= "Accept-Encoding: gzip, deflate, br\r\n";
$data .= "Accept-Language: zh-CN,zh;q=0.9,en;q=0.8\r\n";
$data .= "Cookie: PHPSESSID=679eca30f8e96dcb3ad4ff82ceb62079\r\n";

$request = Request::create();

var_dump($request->isCompleted()); // false
var_dump($request->parse($data)); // 637
var_dump($request); // Swoole\Http\Request

var_dump($request->parse("\r\n")); // 2
var_dump($request->isCompleted()); // true

parse 方法会尽可能多的去解析报文，所以在打印$request的时候，看起来报文已经解析完成了，但实际上这个报文不完整，并没有到达结尾

再次调用parse方法补充一个\r\n才算成功到达了结尾

下篇文章将会讲解 Http\Response 的增强，就不需要像文章开头的$send_data一样手动去拼接 HTTP 协议了