From ba63582f143a5eae9709119bb8cafb365643b36f Mon Sep 17 00:00:00 2001
From: Urban Müller
Date: Mon, 27 Jul 2020 16:48:43 +0200
Subject: make locking in it_url::get_cache optional

---
 it_url.class | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/it_url.class b/it_url.class
index 9b84996..6fcc941 100644
--- a/it_url.class
+++ b/it_url.class
@@ -501,6 +501,7 @@ static function get_cache_filename($p)
  * @param $p['keepfailed']  keep old versions of files if download fails (sending alerts conservatively)
  * @param $p['returnheaders'] Return array($path, $headers) instead of simply $path
  * @param $p['postprocess'] NOT SUPPORTED, use ::get_cache_contents
+ * @param $p['lock']        prevent multiple requests to same url from different processes [true]
  * @return Cache filename or false if fetch failed
  */
 static function get_cache($p = array())
@@ -523,7 +524,7 @@ static function get_cache($p = array())
 	{
 		$fileexists = $filemtime !== true;
 
-		if ($lock = it_url::_lock($path))
+		if ($lock = it_url::_lock($path, $p))
 		{
 			# Touch existing file to prevent locking other getters while refreshing
 			if ($fileexists)
@@ -542,7 +543,7 @@ static function get_cache($p = array())
 			else
 				@unlink($path);	# Expired and failed to get
 
-			it_url::_unlock($path, $lock);
+			it_url::_unlock($path, $lock, $p);
 		}
 		else
 		{
@@ -675,10 +676,10 @@ static function _expired($path, $maxage)
  * @param $path File to lock
  * @return Lock handle if successfully locked file
  */
-static function _lock($path)
+static function _lock($path, $p)
 {
 	$force = EDC('nocache') || (($mtime = @filemtime("$path.lock")) && (time() - $mtime > 30)); # expire forgotten locks
-	return @it::fopen("$path.lock", $force ? "w" : "x");
+	return ($p['lock'] ?? true) ? @it::fopen("$path.lock", $force ? "w" : "x") : true;
 }
 
 /**
@@ -686,10 +687,13 @@ static function _lock($path)
  * @param $path File to unlock
  * @param $lock Handle to lock acquird by _lock
  */
-static function _unlock($path, $lock)
+static function _unlock($path, $lock, $p)
 {
-	fclose($lock);
-	@unlink("$path.lock");
+	if ($p['lock'] ?? true)
+	{
+		fclose($lock);
+		@unlink("$path.lock");
+	}
 }
 
 /**
-- 
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