utils: cache get_warehouses() result based on schema files paths (#38067)

bijoe/utils.py

@@ -21,22 +21,39 @@ import json
 from django.conf import settings
 from django.db import connection
 from django.utils.translation import ugettext as _
+try:
+    from functools import lru_cache
+except ImportError:
+    from django.utils.lru_cache import lru_cache
+
 
 from .schemas import Warehouse
 
 
-def get_warehouses():
-    warehouses = []
+def get_warehouses_paths():
     for pattern in settings.BIJOE_SCHEMAS:
         for path in glob.glob(pattern):
-            warehouses.append(Warehouse.from_json(json.load(open(path))))
+            yield path
     if hasattr(connection, 'tenant'):
         pattern = os.path.join(connection.tenant.get_directory(), 'schemas', '*.model')
         for path in glob.glob(pattern):
-            warehouses.append(Warehouse.from_json(json.load(open(path))))
+            yield path
+
+
+@lru_cache()
+def get_warehouses_by_paths(paths):
+    warehouses = []
+    for path in paths:
+        d = json.load(open(path))
+        warehouses.append(Warehouse.from_json(d))
     return warehouses
 
 
+def get_warehouses():
+    paths = frozenset(get_warehouses_paths())
+    return get_warehouses_by_paths(paths)
+
+
 def human_join(l):
     if not l:
         return ''