Introduction to custom dependency injection examples of lumen in php

For example, I now have a token authentication system. Currently, I use mysql token table to implement it. It may be changed to redis in the future. How can I achieve seamless connections in the future?

First define a contract file app/Contracts/TokenHandler.php

      
Three methods are defined here: create token, get the user corresponding to the token, and delete token.
      

      
Then we write an implementation app/Services/MysqlTokenHandler.php under Mysql
      


      
count() >= $this->userTokensMax) { Token::where('user_id', $userId)->orderBy('updated_at', 'asc')->first()->delete(); } $token = \Illuminate\Support\Str::random(32); if (!Token::create(['token' => $token, 'user_id' => $userId])) { return false; } return $token; } /** * @inheritdoc */ public function getTokenUser($token) { $tokenObject = Token::where('token', $token)->first(); return $tokenObject && $tokenObject->user ? $tokenObject->user : false; } /** * @inheritdoc */ public function removeToken($token) { return Token::find($token)->delete(); } }
      

      
Then Bind the mapping relationship between the two in bootstrap/app.php:
      

      

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$app->singleton( App\Contracts\TokenHandler::class, App\Services\MysqlTokenHandler::class);
      

      
If it is replaced by redis in the future, Just rewrite an implementation of RedisTokenHandler and rebind it, and the specific business logic code does not need to be changed.
      
So you can directly inject the object instance in the controller, as long as you declare the contract type before the parameters:
      

      


      
public function logout(Request $request, TokenHandler $tokenHandler) { if ($tokenHandler->removeToken($request->input('api_token'))) { return $this->success([]); } else { return $this->error(Lang::get('messages.logout_fail')); } }
      
You can also get the injection manually in the code An instance of an object, such as:
      

      


      
$currentUser = app(\App\Contracts\TokenHandler::class)->getTokenUser($request->input('api_token'));
      

      
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