+
+class preiter(object):
+ __slots__ = ["bk", "bki", "_next"]
+ end = object()
+ def __init__(self, real):
+ self.bk = real
+ self.bki = iter(real)
+ self._next = None
+ self.__next__()
+
+ def __iter__(self):
+ return self
+
+ def __next__(self):
+ if self._next is self.end:
+ raise StopIteration()
+ ret = self._next
+ try:
+ self._next = next(self.bki)
+ except StopIteration:
+ self._next = self.end
+ return ret
+
+ def close(self):
+ if hasattr(self.bk, "close"):
+ self.bk.close()
+
+def pregen(callable):
+ def wrapper(*args, **kwargs):
+ return preiter(callable(*args, **kwargs))
+ wrapper.__wrapped__ = callable
+ return wrapper
+
+class sessiondata(object):
+ @classmethod
+ def get(cls, req, create=True):
+ sess = cls.sessdb().get(req)
+ with sess.lock:
+ try:
+ return sess[cls]
+ except KeyError:
+ if not create:
+ return None
+ ret = cls(req, sess)
+ sess[cls] = ret
+ return ret
+
+ @classmethod
+ def sessdb(cls):
+ return session.default.val
+
+class autodirty(sessiondata):
+ @classmethod
+ def get(cls, req):
+ ret = super().get(req)
+ if "_is_dirty" not in ret.__dict__:
+ ret.__dict__["_is_dirty"] = False
+ return ret
+
+ def sessfrozen(self):
+ self.__dict__["_is_dirty"] = False
+
+ def sessdirty(self):
+ return self._is_dirty
+
+ def __setattr__(self, name, value):
+ super().__setattr__(name, value)
+ if "_is_dirty" in self.__dict__:
+ self.__dict__["_is_dirty"] = True
+
+ def __delattr__(self, name):
+ super().__delattr__(name, value)
+ if "_is_dirty" in self.__dict__:
+ self.__dict__["_is_dirty"] = True
+
+class manudirty(object):
+ def __init__(self, *args, **kwargs):
+ super().__init__(*args, **kwargs)
+ self.__dirty = False
+
+ def sessfrozen(self):
+ self.__dirty = False
+
+ def sessdirty(self):
+ return self.__dirty
+
+ def dirty(self):
+ self.__dirty = True
+
+class specslot(object):
+ __slots__ = ["nm", "idx", "dirty"]
+ unbound = object()
+
+ def __init__(self, nm, idx, dirty):
+ self.nm = nm
+ self.idx = idx
+ self.dirty = dirty
+
+ @staticmethod
+ def slist(ins):
+ # Avoid calling __getattribute__
+ return specdirty.__sslots__.__get__(ins, type(ins))
+
+ def __get__(self, ins, cls):
+ val = self.slist(ins)[self.idx]
+ if val is specslot.unbound:
+ raise AttributeError("specslot %r is unbound" % self.nm)
+ return val
+
+ def __set__(self, ins, val):
+ self.slist(ins)[self.idx] = val
+ if self.dirty:
+ ins.dirty()
+
+ def __delete__(self, ins):
+ self.slist(ins)[self.idx] = specslot.unbound
+ ins.dirty()
+
+class specclass(type):
+ def __init__(self, name, bases, tdict):
+ super().__init__(name, bases, tdict)
+ sslots = set()
+ dslots = set()
+ for cls in self.__mro__:
+ css = cls.__dict__.get("__saveslots__", ())
+ sslots.update(css)
+ dslots.update(cls.__dict__.get("__dirtyslots__", css))
+ self.__sslots_l__ = list(sslots)
+ self.__sslots_a__ = list(sslots | dslots)
+ for i, slot in enumerate(self.__sslots_a__):
+ setattr(self, slot, specslot(slot, i, slot in dslots))
+
+class specdirty(sessiondata, metaclass=specclass):
+ __slots__ = ["session", "__sslots__", "_is_dirty"]
+
+ def __specinit__(self):
+ pass
+
+ @staticmethod
+ def __new__(cls, req, sess):
+ self = super().__new__(cls)
+ self.session = sess
+ self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
+ self.__specinit__()
+ self._is_dirty = False
+ return self
+
+ def __getnewargs__(self):
+ return (None, self.session)
+
+ def dirty(self):
+ self._is_dirty = True
+
+ def sessfrozen(self):
+ self._is_dirty = False
+
+ def sessdirty(self):
+ return self._is_dirty
+
+ def __getstate__(self):
+ ret = {}
+ for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
+ if val is specslot.unbound:
+ ret[nm] = False, None
+ else:
+ ret[nm] = True, val
+ return ret
+
+ def __setstate__(self, st):
+ ss = specslot.slist(self)
+ for i, nm in enumerate(type(self).__sslots_a__):
+ bound, val = st.pop(nm, (False, None))
+ if not bound:
+ ss[i] = specslot.unbound
+ else:
+ ss[i] = val
+
+def datecheck(req, mtime):
+ if "If-Modified-Since" in req.ihead:
+ rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
+ if rtime >= math.floor(mtime):
+ raise resp.unmodified()
+ req.ohead["Last-Modified"] = proto.httpdate(mtime)