hyperf/docs/en/nano.md

`hyperf/nano` is a package that scales Hyperf down to a single file.

## Example

```php
<?php
// index.php
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create('0.0.0.0', 9051);

$app->get('/', function () {

    $user = $this->request->input('user', 'nano');
    $method = $this->request->getMethod();

    return [
        'message' => "hello {$user}",
        'method' => $method,
    ];

});

$app->run();
```

Run

```bash
php index.php start
```

That's all you need.

## Feature

* No skeleton.
* Fast startup.
* Zero config.
* Closure style.
* Support all Hyperf features except annotations.
* Compatible with all Hyperf components.

## More Examples

### Routing

$app inherits all methods from hyperf router.

```php
<?php
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->addGroup('/nano', function () use ($app) {
    $app->addRoute(['GET', 'POST'], '/{id:\d+}', function($id) {
        return '/nano/'.$id;
    });
    $app->put('/{name:.+}', function($name) {
        return '/nano/'.$name;
    });
});

$app->run();
```

### DI Container 
```php
<?php
use Hyperf\Nano\ContainerProxy;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

class Foo {
    public function bar() {
        return 'bar';
    }   
}

$app = AppFactory::create();
$app->getContainer()->set(Foo::class, new Foo());

$app->get('/', function () {
    /** @var ContainerProxy $this */
    $foo = $this->get(Foo::class);
    return $foo->bar();
});

$app->run();
```
> As a convention, $this is bind to ContainerProxy in all closures managed by nano, including middleware, exception handler and more.

### Middleware
```php
<?php
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->get('/', function () {
    return $this->request->getAttribute('key');
});

$app->addMiddleware(function ($request, $handler) {
    $request = $request->withAttribute('key', 'value');
    return $handler->handle($request);
});

$app->run();
```

> In addition to closure, all $app->addXXX() methods also accept class name as argument. You can pass any corresponding hyperf classes.

### ExceptionHandler

```php
<?php
use Hyperf\HttpMessage\Stream\SwooleStream;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->get('/', function () {
    throw new \Exception();
});

$app->addExceptionHandler(function ($throwable, $response) {
    return $response->withStatus('418')
        ->withBody(new SwooleStream('I\'m a teapot'));
});

$app->run();
```

### Custom Command

```php
<?php
use Hyperf\Contract\StdoutLoggerInterface;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->addCommand('echo', function(){
    $this->get(StdoutLoggerInterface::class)->info('A new command called echo!');
});

$app->run();
```

To run this command, execute
```bash
php index.php echo
```

### Event Listener
```php
<?php
use Hyperf\Contract\StdoutLoggerInterface;
use Hyperf\Framework\Event\BootApplication;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->addListener(BootApplication::class, function($event){
    $this->get(StdoutLoggerInterface::class)->info('App started');
});

$app->run();
```

### Custom Process
```php
<?php
use Hyperf\Contract\StdoutLoggerInterface;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->addProcess(function(){
    while (true) {
        sleep(1);
        $this->get(StdoutLoggerInterface::class)->info('Processing...');
    }
});

$app->run();
```

### Crontab

```php
<?php
use Hyperf\Contract\StdoutLoggerInterface;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->addCrontab('* * * * * *', function(){
    $this->get(StdoutLoggerInterface::class)->info('execute every second!');
});

$app->run();
```

### Use Hyperf Component.

```php
<?php
use Hyperf\DB\DB;
use Hyperf\Nano\Factory\AppFactory;

require_once __DIR__ . '/vendor/autoload.php';

$app = AppFactory::create();

$app->config([
    'db.default' => [
        'host' => env('DB_HOST', 'localhost'),
        'port' => env('DB_PORT', 3306),
        'database' => env('DB_DATABASE', 'hyperf'),
        'username' => env('DB_USERNAME', 'root'),
        'password' => env('DB_PASSWORD', ''),
    ]
]);

$app->get('/', function(){
    return DB::query('SELECT * FROM `user` WHERE gender = ?;', [1]);
});

$app->run();
```