Ticket #10771: contextmanager-v3.patch

db/transaction.py

@@ -265 +265 @@
             leave_transaction_management()
 
     return wraps(func)(_commit_manually)
+
+####################
+# CONTEXT MANAGERS #
+####################
+class Transaction(object):
+    def __enter__(cls):
+        enter_transaction_management()
+        managed(True)
+    __enter__ = classmethod(__enter__)
+    
+    def __exit__(cls, exc_type, value, traceback):
+        try:
+            if exc_type is None:
+                # Nested block executed successfully
+                if is_dirty():
+                    commit()
+            else:
+                # Some exception was raised
+                if is_dirty():
+                    rollback()
+                return False # re-raises the exception
+        finally:
+            leave_transaction_management()
+    __exit__ = classmethod(__exit__)