From 44b66843e928e94b4ea8dea60ecde62ba7ec8d61 Mon Sep 17 00:00:00 2001
From: Seb35 <seb35@seb35.fr>
Date: Tue, 12 Jun 2018 12:43:35 +0200
Subject: [PATCH] Define a default Monolog logger if inexistant
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In the array 'loggers' the key '@default' is assumed to be present,
hence be sure it is defined: this is the system default for MediaWiki,
it can be overwritten if desired.

This default php://stderr with level ERROR is inspired from Monolog’s
own default, which is php://stderr with level DEBUG: this is similar
but less violent for the average MediaWiki sysadmin.

Bug: T196906
Change-Id: Id74083fc20ddf906c40e6d149095e8ade4c68572
---
 includes/debug/logger/MonologSpi.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/includes/debug/logger/MonologSpi.php b/includes/debug/logger/MonologSpi.php
index ff653ab241..d67696a89a 100644
--- a/includes/debug/logger/MonologSpi.php
+++ b/includes/debug/logger/MonologSpi.php
@@ -22,6 +22,7 @@ namespace MediaWiki\Logger;
 
 use MediaWiki\Logger\Monolog\BufferHandler;
 use Monolog\Logger;
+use Monolog\Handler\StreamHandler;
 use Wikimedia\ObjectFactory;
 
 /**
@@ -147,6 +148,17 @@ class MonologSpi implements Spi {
 				$this->config[$key] = $value;
 			}
 		}
+		if ( !isset( $this->config['loggers']['@default'] ) ) {
+			$this->config['loggers']['@default'] = [
+				'handlers' => [ '@default' ],
+			];
+			if ( !isset( $this->config['handlers']['@default'] ) ) {
+				$this->config['handlers']['@default'] = [
+					'class' => StreamHandler::class,
+					'args' => [ 'php://stderr', Logger::ERROR ],
+				];
+			}
+		}
 		$this->reset();
 	}
 
-- 
2.20.1