From b1c317a253445a6458f1263c1b622a788cc7cd0e Mon Sep 17 00:00:00 2001
From: Alexandre Alapetite <alexandre@alapetite.fr>
Date: Sun, 10 Dec 2017 21:31:41 +0100
Subject: Log rotation, use Minz_Log, new log constants

ADMIN_LOG, API_LOG, PSHB_LOG
---
 lib/Minz/Log.php | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

(limited to 'lib/Minz')

diff --git a/lib/Minz/Log.php b/lib/Minz/Log.php
index 6231754fa..5e7831cdb 100644
--- a/lib/Minz/Log.php
+++ b/lib/Minz/Log.php
@@ -71,7 +71,7 @@ class Minz_Log {
 			     . ' [' . $level_label . ']'
 			     . ' --- ' . $information . "\n";
 
-			self::checkLogfileSize($file_name);
+			self::ensureMaxLogSize($file_name);
 
 			if (file_put_contents($file_name, $log, FILE_APPEND | LOCK_EX) === false) {
 				throw new Minz_PermissionDeniedException($file_name, Minz_Exception::ERROR);
@@ -88,12 +88,24 @@ class Minz_Log {
 	 * @param $file_name
 	 * @throws Minz_PermissionDeniedException
 	 */
-	protected static function checkLogfileSize($file_name) {
-		$maxSize = defined('MAX_LOG_SIZE') ? MAX_LOG_SIZE : 512000;
-		if (@filesize($file_name) > $maxSize) {
-			if (file_put_contents($file_name, '') === false) {
+	protected static function ensureMaxLogSize($file_name) {
+		$maxSize = defined('MAX_LOG_SIZE') ? MAX_LOG_SIZE : 1048576;
+		if ($maxSize > 0 && @filesize($file_name) > $maxSize) {
+			$fp = fopen($file_name, 'c+');
+			if ($fp && flock($fp, LOCK_EX)) {
+				fseek($fp, -intval($maxSize / 2), SEEK_END);
+				$content = fread($fp, $maxSize);
+				rewind($fp);
+				ftruncate($fp, 0);
+				fwrite($fp, $content ? $content : '');
+				fflush($fp);
+				flock($fp, LOCK_UN);
+			} else {
 				throw new Minz_PermissionDeniedException($file_name, Minz_Exception::ERROR);
 			}
+			if ($fp) {
+				fclose($fp);
+			}
 		}
 	}
 
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