From 0e930efd95d6077e9cdaf32726dc64fe3e427910 Mon Sep 17 00:00:00 2001
From: shortcutme <tamas@zeronet.io>
Date: Sat, 15 Jul 2017 01:30:35 +0200
Subject: [PATCH] Cache SafeRe patterns

---
 src/util/SafeRe.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/util/SafeRe.py b/src/util/SafeRe.py
index d5ddf3b6..4c104f4f 100644
--- a/src/util/SafeRe.py
+++ b/src/util/SafeRe.py
@@ -4,6 +4,8 @@ import re
 class UnsafePatternError(Exception):
     pass
 
+cached_patterns = {}
+
 
 def isSafePattern(pattern):
     if len(pattern) > 255:
@@ -16,5 +18,10 @@ def isSafePattern(pattern):
 
 
 def match(pattern, *args, **kwargs):
-    if isSafePattern(pattern):
-        return re.match(pattern, *args, **kwargs)
+    cached_pattern = cached_patterns.get(pattern)
+    if cached_pattern:
+        return cached_pattern.match(*args, **kwargs)
+    else:
+        if isSafePattern(pattern):
+            cached_patterns[pattern] = re.compile(pattern)
+            return cached_patterns[pattern].match(*args, **kwargs)