Adding rotateByCopy to yii\log\FileTarget #3562

framework/CHANGELOG.md

@@ -57,6 +57,7 @@ Yii Framework 2 Change Log
 - Enh #3518: `yii\helpers\Html::encode()` now replaces invalid code sequences with "?" (DaSourcerer)
 - Enh #3521: Added `yii\filters\HttpCache::sessionCacheLimiter` (qiangxue)
 - Enh #3542: Removed requirement to specify `extensions` in application config (samdark)
+- Enh #3562: Adding rotateByCopy to yii\log\FileTarget (pawzar)
 - Enh #3574: Add integrity check support for SQLite (zeeke)
 - Enh: Added support for using sub-queries when building a DB query with `IN` condition (qiangxue)
 - Enh: Supported adding a new response formatter without the need to reconfigure existing formatters (qiangxue)

framework/log/FileTarget.php

@@ -51,6 +51,11 @@ class FileTarget extends Target
      * but read-only for other users.
      */
     public $dirMode = 0775;
+    /**
+     * @var boolean Whether to rotate primary log by copy and truncate
+     * which is more compatible with log tailers. Defaults to false.
+     */
+    public $rotateByCopy = false;
 
     /**
      * Initializes the route.
@@ -115,10 +120,18 @@ class FileTarget extends Target
                 if ($i === $this->maxLogFiles) {
                     @unlink($rotateFile);
                 } else {
+                    if ($this->rotateByCopy) {
+                        @copy($rotateFile, $file . '.' . ($i + 1));
+                        if ($fp = @fopen($rotateFile, 'a')) {
+                            @ftruncate($fp, 0);
+                            @fclose($fp);
+                        }
+                    } else {
                         @rename($rotateFile, $file . '.' . ($i + 1));
                     }
                 }
             }
+        }
         if (is_file($file)) {
             @rename($file, $file . '.1'); // suppress errors because it's possible multiple processes enter into this section
         }