Created Logger factory and logger config, and added logger dependencies

composer.json

@@ -26,7 +26,9 @@
         "doctrine/orm": "^2.5",
         "guzzlehttp/guzzle": "^6.2",
         "symfony/console": "^3.0",
-        "firebase/php-jwt": "^4.0"
+        "firebase/php-jwt": "^4.0",
+        "monolog/monolog": "^1.21",
+        "theorchard/monolog-cascade": "^0.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0",

config/autoload/logger.global.php

@@ -1,10 +1,30 @@
 <?php
+use Monolog\Handler\RotatingFileHandler;
+use Monolog\Logger;
+
 return [
 
     'logger' => [
+        'formatters' => [
+            'dashed' => [
+                'format' => '[%datetime%] %channel%.%level_name% - %message% %context%' . PHP_EOL,
+                'include_stacktraces' => true,
+            ],
+        ],
+
+        'handlers' => [
+            'rotating_file_handler' => [
+                'class' => RotatingFileHandler::class,
+                'level' => Logger::INFO,
+                'filename' => 'data/log/shlink_log.log',
+                'max_files' => 30,
+                'formatter' => 'dashed',
+            ],
+        ],
+
         'loggers' => [
             'Shlink' => [
-                'handlers' => [],
+                'handlers' => ['rotating_file_handler'],
             ],
         ],
     ],

config/autoload/logger.local.php.dist

@@ -0,0 +1,14 @@
+<?php
+use Monolog\Logger;
+
+return [
+
+    'logger' => [
+        'handlers' => [
+            'rotating_file_handler' => [
+                'level' => Logger::DEBUG,
+            ],
+        ],
+    ],
+
+];

module/Common/config/dependencies.config.php

@@ -2,9 +2,11 @@
 use Acelaya\ZsmAnnotatedServices\Factory\V3\AnnotatedFactory;
 use Doctrine\Common\Cache\Cache;
 use Doctrine\ORM\EntityManager;
+use Psr\Log\LoggerInterface;
 use Shlinkio\Shlink\Common\ErrorHandler;
 use Shlinkio\Shlink\Common\Factory\CacheFactory;
 use Shlinkio\Shlink\Common\Factory\EntityManagerFactory;
+use Shlinkio\Shlink\Common\Factory\LoggerFactory;
 use Shlinkio\Shlink\Common\Factory\TranslatorFactory;
 use Shlinkio\Shlink\Common\Middleware\LocaleMiddleware;
 use Shlinkio\Shlink\Common\Service\IpLocationResolver;
@@ -19,11 +21,15 @@ return [
             EntityManager::class => EntityManagerFactory::class,
             GuzzleHttp\Client::class => InvokableFactory::class,
             Cache::class => CacheFactory::class,
-            IpLocationResolver::class => AnnotatedFactory::class,
+            LoggerInterface::class => LoggerFactory::class,
+            'Logger_Shlink' => LoggerFactory::class,
+
             Translator::class => TranslatorFactory::class,
             TranslatorExtension::class => AnnotatedFactory::class,
             LocaleMiddleware::class => AnnotatedFactory::class,
 
+            IpLocationResolver::class => AnnotatedFactory::class,
+
             ErrorHandler\ContentBasedErrorHandler::class => AnnotatedFactory::class,
             ErrorHandler\ErrorHandlerManager::class => ErrorHandler\ErrorHandlerManagerFactory::class,
         ],
@@ -31,6 +37,7 @@ return [
             'em' => EntityManager::class,
             'httpClient' => GuzzleHttp\Client::class,
             'translator' => Translator::class,
+            'logger' => LoggerInterface::class,
             AnnotatedFactory::CACHE_SERVICE => Cache::class,
         ],
     ],

module/Common/src/Factory/LoggerFactory.php

@@ -0,0 +1,39 @@
+<?php
+namespace Shlinkio\Shlink\Common\Factory;
+
+use Cascade\Cascade;
+use Interop\Container\ContainerInterface;
+use Interop\Container\Exception\ContainerException;
+use Zend\ServiceManager\Exception\ServiceNotCreatedException;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
+use Zend\ServiceManager\Factory\FactoryInterface;
+
+class LoggerFactory implements FactoryInterface
+{
+    /**
+     * Create an object
+     *
+     * @param  ContainerInterface $container
+     * @param  string $requestedName
+     * @param  null|array $options
+     * @return object
+     * @throws ServiceNotFoundException if unable to resolve the service.
+     * @throws ServiceNotCreatedException if an exception is raised when
+     *     creating a service.
+     * @throws ContainerException if any other error occurs
+     */
+    public function __invoke(ContainerInterface $container, $requestedName, array $options = null)
+    {
+        $config = $container->has('config') ? $container->get('config') : [];
+        Cascade::fileConfig(isset($config['logger']) ? $config['logger'] : ['loggers' => []]);
+
+        // Compose requested logger name
+        $loggerName = isset($options) & isset($options['logger_name']) ? $options['logger_name'] : 'Logger';
+        $nameParts = explode('_', $requestedName);
+        if (count($nameParts) > 1) {
+            $loggerName = $nameParts[1];
+        }
+
+        return Cascade::getLogger($loggerName);
+    }
+}