From d1f70c6c18e44a82ded765f4d53668ea3e5d34a1 Mon Sep 17 00:00:00 2001
From: Fredrik Tolf <fredrik@dolda2000.com>
Date: Wed, 21 Dec 2011 07:39:18 +0100
Subject: [PATCH] Added a utility class for session data storage.

---
 wrw/__init__.py |  2 +-
 wrw/util.py     | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/wrw/__init__.py b/wrw/__init__.py
index aec9825..30936b6 100644
--- a/wrw/__init__.py
+++ b/wrw/__init__.py
@@ -1,6 +1,6 @@
 __all__ = ["wsgiwrap", "restart", "cookie", "formdata"]
 
-from util import wsgiwrap, persession
+from util import wsgiwrap, persession, sessiondata
 from dispatch import restart
 import cookie
 from form import formdata
diff --git a/wrw/util.py b/wrw/util.py
index 09b9e36..3da6053 100644
--- a/wrw/util.py
+++ b/wrw/util.py
@@ -19,3 +19,35 @@ def persession(data = None):
             return sess[callable].handle(req)
         return wrapper
     return dec
+
+class sessiondata(object):
+    @classmethod
+    def get(cls, req):
+        sess = cls.sessdb().get(req)
+        with sess.lock:
+            try:
+                return sess[cls]
+            except KeyError:
+                ret = cls(req)
+                ret._is_dirty = [False]
+                sess[cls] = ret
+                return ret
+
+    @classmethod
+    def sessdb(cls):
+        return session.default
+
+    def sessfrozen(self):
+        self._is_dirty[:] = [False]
+
+    def sessdirty(self):
+        return self._is_dirty[0]
+
+    def __setattr__(self, name, value):
+        if hasattr(self, "_is_dirty"):
+            self._is_dirty[:] = [True]
+        super(sessiondata, self).__setattr__(name, value)
+
+    def __delattr__(self, name):
+        super(sessiondata, self).__delattr__(name)
+        self._is_dirty[:] = [True]
-- 
2.11.0