#6622 Logger refactoring: restored the "screen" backend to log to HTML notifications

The "screen" backend (WebNotificationHandler) now logs to HTML notification boxes using the `Notification` api.
I've re-set the default log level to WARN, and logged PHP notices/warnings to "warning" so that on a default install they are shown in the page in a yellow/warning notification box.

For the record, the default log level had previously been changed from WARN to ERROR because screen logging was previously messing the HTML/JSON output (which was breaking archiving). With the logger refactoring this is no longer a problem.

2 files changed, 46 insertions, 1 deletions

diff --git a/core/Error.php b/core/Error.php
index 0dd346244f..6b69e68848 100644
--- a/core/Error.php
+++ b/core/Error.php
@@ -94,7 +94,7 @@ class Error
             case E_DEPRECATED:
             case E_USER_DEPRECATED:
             default:
-                Log::info(self::createLogMessage($errno, $errstr, $errfile, $errline));
+                Log::warning(self::createLogMessage($errno, $errstr, $errfile, $errline));
                 break;
         }
     }
diff --git a/core/Log/Handler/WebNotificationHandler.php b/core/Log/Handler/WebNotificationHandler.php
new file mode 100644
index 0000000000..af9afbe68e
--- /dev/null
+++ b/core/Log/Handler/WebNotificationHandler.php
@@ -0,0 +1,45 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Log\Handler;
+
+use Monolog\Handler\AbstractProcessingHandler;
+use Monolog\Logger;
+use Piwik\Common;
+use Piwik\Notification;
+use Piwik\Notification\Manager;
+
+/**
+ * Writes log messages into HTML notification box.
+ */
+class WebNotificationHandler extends AbstractProcessingHandler
+{
+    protected function write(array $record)
+    {
+        switch ($record['level']) {
+            case Logger::EMERGENCY:
+            case Logger::ALERT:
+            case Logger::CRITICAL:
+            case Logger::ERROR:
+                $context = Notification::CONTEXT_ERROR;
+                break;
+            case Logger::WARNING:
+                $context = Notification::CONTEXT_WARNING;
+                break;
+            default:
+                $context = Notification::CONTEXT_INFO;
+                break;
+        }
+
+        $message = htmlentities($record['formatted']);
+
+        $notification = new Notification($message);
+        $notification->context = $context;
+        Manager::notify(Common::getRandomString(), $notification);
+    }
+}