Add debug support

Close #72

Author: baopham

README.md

@@ -51,6 +51,7 @@ Install
         'region' => env('DYNAMODB_REGION'),
         'local_endpoint' => env('DYNAMODB_LOCAL_ENDPOINT'), // see http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Tools.DynamoDBLocal.html
         'local' => env('DYNAMODB_LOCAL'), // true or false? should use dynamodb_local or not?
+        'debug' => true, // if true, it will use Laravel Log. For advanced options, see http://docs.aws.amazon.com/aws-sdk-php/v3/guide/guide/configuration.html
     ],
     ...
     ```
@@ -61,12 +62,8 @@ Install
     // config/services.php
     ...
     'dynamodb' => [
-        'key' => env('AWS_ACCESS_KEY_ID'),
-        'secret' => env('AWS_SECRET_ACCESS_KEY'),
+        ...
         'token' => env('AWS_SESSION_TOKEN'),
-        'region'=> env('DYNAMODB_REGION'),
-        'local_endpoint' => env('DYNAMODB_LOCAL_ENDPOINT'),
-        'local'=> env('DYNAMODB_LOCAL') // true or false? should use dynamodb_local or not?
     ]
     ...
     ```

src/DynamoDbServiceProvider.php

@@ -4,6 +4,7 @@
 
 use Aws\DynamoDb\Marshaler;
 use Illuminate\Support\Facades\App;
+use Illuminate\Support\Facades\Log;
 use Illuminate\Support\ServiceProvider;
 
 class DynamoDbServiceProvider extends ServiceProvider
@@ -34,6 +35,21 @@ public function register()
         $this->bindForApp($marshalerOptions);
     }
 
+    protected function getDebugOptions()
+    {
+        $debug = config('services.dynamodb.debug');
+
+        if ($debug === true) {
+            $logfn = function ($msg) {
+                Log::info($msg);
+            };
+
+            return ['logfn' => $logfn];
+        }
+
+        return $debug;
+    }
+
     protected function bindForApp($marshalerOptions = [])
     {
         $this->app->singleton('BaoPham\DynamoDb\DynamoDbClientInterface', function ($app) use ($marshalerOptions) {
@@ -45,6 +61,7 @@ protected function bindForApp($marshalerOptions = [])
                 ],
                 'region' => config('services.dynamodb.region'),
                 'version' => '2012-08-10',
+                'debug' => $this->getDebugOptions(),
             ];
 
             $client = new DynamoDbClientService($config, new Marshaler($marshalerOptions), new EmptyAttributeFilter());
@@ -66,7 +83,9 @@ protected function bindForTesting($marshalerOptions = [])
                 'region' => $region,
                 'version' => '2012-08-10',
                 'endpoint' => config('services.dynamodb.local_endpoint'),
+                'debug' => $this->getDebugOptions(),
             ];
+
             $client = new DynamoDbClientService($config, new Marshaler($marshalerOptions), new EmptyAttributeFilter());
 
             return $client;