Optimize performance of access_has_bug_level() api function

dregad · dregad · commit 5e145289a9be · 2013-02-26T17:20:11.000+01:00
Through use of a static array to cache the reporter threshold when $g_limit_reporter = ON and more importantly reducing the total number of API calls, the performance of this function has been improved by 65% (stress tests executed over 2000 iterations, 0.34s vs 0.22s). Issue #15538, follow up on b3276bb
diff --git a/core/access_api.php b/core/access_api.php
@@ -412,37 +412,44 @@ function access_has_bug_level( $p_access_level, $p_bug_id, $p_user_id = null ) {
 	}
 
 	$t_project_id = bug_get_field( $p_bug_id, 'project_id' );
+	$t_bug_is_user_reporter = bug_is_user_reporter( $p_bug_id, $p_user_id );
+	$t_access_level = access_get_project_level( $t_project_id, $p_user_id );
 
 	# check limit_Reporter (Issue #4769)
 	# reporters can view just issues they reported
 	$t_limit_reporters = config_get( 'limit_reporters', null, $p_user_id, $t_project_id );
-	$t_report_bug_threshold = config_get( 'report_bug_threshold', null, $p_user_id, $t_project_id );
-	if( !is_array( $t_report_bug_threshold ) ) {
-		$t_report_bug_threshold = array( $t_report_bug_threshold );
-	}
-	if( $t_limit_reporters && !bug_is_user_reporter( $p_bug_id, $p_user_id ) ) {
-		$t_has_access = false;
-		foreach( $t_report_bug_threshold as $t_threshold ) {
-			if( access_has_project_level( $t_threshold + 1, $t_project_id, $p_user_id ) ) {
-				$t_has_access = true;
-				break;
+	if( $t_limit_reporters && !$t_bug_is_user_reporter ) {
+		# Here we only need to check that the current user has an access level
+		# higher than the lowest needed to report issues (report_bug_threshold).
+		# To improve performance, esp. when processing for several projects, we
+		# build a static array holding that threshold for each project
+		static $s_thresholds = array();
+		if( !isset( $s_thresholds[$t_project_id] ) ) {
+			$t_report_bug_threshold = config_get( 'report_bug_threshold', null, $p_user_id, $t_project_id );
+			if( !is_array( $t_report_bug_threshold ) ) {
+				$s_thresholds[$t_project_id] = $t_report_bug_threshold;
+			} else if ( empty( $t_report_bug_threshold ) ) {
+				$s_thresholds[$t_project_id] = NOBODY;
+			} else {
+				sort( $t_report_bug_threshold );
+				$s_thresholds[$t_project_id] = $t_report_bug_threshold[0];
 			}
 		}
-		if( !$t_has_access ) {
+
+		if( !access_compare_level( $s_thresholds[$t_project_id], $t_access_level ) ) {
 			return false;
 		}
 	}
 
 	# If the bug is private and the user is not the reporter, then
 	# they must also have higher access than private_bug_threshold
-	if( bug_get_field( $p_bug_id, 'view_state' ) == VS_PRIVATE && !bug_is_user_reporter( $p_bug_id, $p_user_id ) ) {
-		$t_access_level = access_get_project_level( $t_project_id, $p_user_id );
+	if( !$t_bug_is_user_reporter && bug_get_field( $p_bug_id, 'view_state' ) == VS_PRIVATE ) {
 		$t_private_bug_threshold = config_get( 'private_bug_threshold', null, $p_user_id, $t_project_id );
 		return access_compare_level( $t_access_level, $t_private_bug_threshold )
-		    && access_compare_level( $t_access_level, $p_access_level );
+			&& access_compare_level( $t_access_level, $p_access_level );
 	}
 
-	return access_has_project_level( $p_access_level, $t_project_id, $p_user_id );
+	return access_compare_level( $p_access_level, $t_access_level );
 }
 
 /**
