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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：

- 新增 create/parse/isCompleted 方法 (#3938) (@matyhtf)
- 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

```php
$server->on('Receive', function ($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

```php
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

```bash
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`

```php
$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。

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

## isCompleted

我们有这样一段 HTTP 请求报文：

```txt
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：

```php
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

下篇文章我们将会讲解 `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

![](https://cdn.jsdelivr.net/gh/sy-records/staticfile/images/swoole/wechat.png)

发布于3年前 · 53 次浏览 · 来自分享

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