Added a utility class for session data storage.

[wrw.git] / wrw / util.py

diff --git a/wrw/util.py b/wrw/util.py
index 22131ea..3da6053 100644 (file)
--- a/wrw/util.py
+++ b/wrw/util.py
@@ -1,6 +1,53 @@
-import req, dispatch
+import req, dispatch, session
 
 def wsgiwrap(callable):
     def wrapper(env, startreq):
-        return dispatch.handle(req.request(env), startreq, callable)
+        return dispatch.handle(req.origrequest(env), startreq, callable)
     return wrapper
+
+def persession(data = None):
+    def dec(callable):
+        def wrapper(req):
+            sess = session.get(req)
+            if callable not in sess:
+                if data is None:
+                    sess[callable] = callable()
+                else:
+                    if data not in sess:
+                        sess[data] = data()
+                    sess[callable] = callable(data)
+            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]