Add log level settings

[MAILPOET-570]

RoboFile.php

@@ -289,7 +289,7 @@ class RoboFile extends \Robo\Tasks {
         './vendor/bin/phpcs '.
         '--standard=./tasks/code_sniffer/MailPoet '.
         '--runtime-set testVersion 5.5-7.2 '.
-        '--ignore=./lib/Util/Sudzy/*,./lib/Util/CSS.php,./lib/Util/XLSXWriter.php,'.
+        '--ignore=./lib/Util/Sudzy/*,./lib/Util/CSS.php,./lib/Util/XLSXWriter.php,./lib/Dependencies/*,'.
         './lib/Util/pQuery/*,./lib/Config/PopulatorData/Templates/* '.
         'lib/ '.
         $severityFlag

lib/Logging/LogHandler.php

@@ -12,12 +12,12 @@ class LogHandler extends AbstractProcessingHandler {
    * Percentage value, what is the probability of running purge routine
    * @var int
    */
-  CONST LOG_PURGE_PROBABILITY = 5;
+  const LOG_PURGE_PROBABILITY = 5;
 
   /**
    * Logs older than this many days will be deleted
    */
-  CONST DAYS_TO_KEEP_LOGS = 30;
+  const DAYS_TO_KEEP_LOGS = 30;
 
   protected function write(array $record) {
     $model = Log::create();

lib/Logging/Logger.php

@@ -5,6 +5,7 @@ namespace MailPoet\Logging;
 use MailPoet\Dependencies\Monolog\Processor\IntrospectionProcessor;
 use MailPoet\Dependencies\Monolog\Processor\MemoryUsageProcessor;
 use MailPoet\Dependencies\Monolog\Processor\WebProcessor;
+use MailPoet\Models\Setting;
 
 class Logger {
 
@@ -30,9 +31,21 @@ class Logger {
         self::$instance[$name]->pushProcessor(new MemoryUsageProcessor());
       }
 
-      self::$instance[$name]->pushHandler(new LogHandler());
+      self::$instance[$name]->pushHandler(new LogHandler(self::getDefaultLogLevel()));
     }
     return self::$instance[$name];
   }
 
+  private static function getDefaultLogLevel() {
+    $settings = Setting::getValue('logging', 'errors');
+    switch ($settings) {
+      case 'everything':
+        return \MailPoet\Dependencies\Monolog\Logger::DEBUG;
+      case 'nothing':
+        return \MailPoet\Dependencies\Monolog\Logger::EMERGENCY;
+      default:
+        return \MailPoet\Dependencies\Monolog\Logger::ERROR;
+    }
+  }
+
 }

views/settings/advanced.html

@@ -244,5 +244,34 @@
         </p>
       </td>
     </tr>
+    <!-- logging -->
+    <tr>
+      <th scope="row">
+        <label><%= __('Logging') %></label>
+        <p class="description">
+          <%= __('Enables logging for diagnostics of plugin behavior.') %>
+      <td>
+        <select
+          name="logging"
+        >
+          <option
+            value="everything"
+            <% if settings.logging == "everything" %>
+              selected
+            <% endif %>
+          ><%= _x('Everything', 'In settings: "Logging: Everything"') %>
+          <option
+            value="errors"
+            <% if settings.logging != "nothing" and settings.logging != "everything" %>
+              selected
+            <% endif %>
+          ><%= _x('Errors only', 'In settings: "Logging: Errors only"') %>
+          <option
+            value="nothing"
+            <% if settings.logging == "nothing" %>
+              selected
+            <% endif %>
+          ><%= _x('Nothing', 'In settings: "Logging: Nothing"') %>
+        </select>
   </tbody>
 </table>