add simple items_equivalent() function to check if two lists contain the same items

whummer · whummer · commit 75d5a03d34fb · 2021-05-30T12:48:04.000+02:00
diff --git a/localstack/utils/cloudformation/template_deployer.py b/localstack/utils/cloudformation/template_deployer.py
@@ -1386,7 +1386,7 @@ def determine_resource_physical_id(resource_id, resources=None, stack=None, attr
 
 def update_resource_details(stack, resource_id, details, action=None):
     resource = stack.resources.get(resource_id, {})
-    if not resource:
+    if not resource or not details:
         return
 
     resource_type = resource.get('Type') or ''
diff --git a/localstack/utils/common.py b/localstack/utils/common.py
@@ -1137,6 +1137,21 @@ def clear_list(list_obj):
         del list_obj[0]
 
 
+def items_equivalent(list1, list2, comparator):
+    """ Returns whether two lists are equivalent (i.e., same items contained in both lists,
+        irresepective of the items' order) with respect to a comparator function. """
+    def contained(item):
+        for _item in list2:
+            if comparator(item, _item):
+                return True
+    if len(list1) != len(list2):
+        return False
+    for item in list1:
+        if not contained(item):
+            return False
+    return True
+
+
 def cleanup_tmp_files():
     for tmp in TMP_FILES:
         try:
