wrw/util.py

   1 import inspect, math
   2 import req, dispatch, session, form, resp, proto
   3
   4 def wsgiwrap(callable):
   5     def wrapper(env, startreq):
   6         return dispatch.handleenv(env, startreq, callable)
   7     wrapper.__wrapped__ = callable
   8     return wrapper
   9
  10 def formparams(callable):
  11     spec = inspect.getargspec(callable)
  12     def wrapper(req):
  13         try:
  14             data = form.formdata(req)
  15         except IOError:
  16             raise resp.httperror(400, "Invalid request", "Form data was incomplete")
  17         args = dict(data.items())
  18         args["req"] = req
  19         if not spec.keywords:
  20             for arg in list(args):
  21                 if arg not in spec.args:
  22                     del args[arg]
  23         for i in xrange(len(spec.args) - (len(spec.defaults) if spec.defaults else 0)):
  24             if spec.args[i] not in args:
  25                 raise resp.httperror(400, "Missing parameter", ("The query parameter `", resp.h.code(spec.args[i]), "' is required but not supplied."))
  26         return callable(**args)
  27     wrapper.__wrapped__ = callable
  28     return wrapper
  29
  30 class funplex(object):
  31     def __init__(self, *funs, **nfuns):
  32         self.dir = {}
  33         self.dir.update(((self.unwrap(fun).__name__, fun) for fun in funs))
  34         self.dir.update(nfuns)
  35
  36     @staticmethod
  37     def unwrap(fun):
  38         while hasattr(fun, "__wrapped__"):
  39             fun = fun.__wrapped__
  40         return fun
  41
  42     def __call__(self, req):
  43         if req.pathinfo == "":
  44             raise resp.redirect(req.uriname + "/")
  45         if req.pathinfo[:1] != "/":
  46             raise resp.notfound()
  47         p = req.pathinfo[1:]
  48         if p == "":
  49             p = "__index__"
  50             bi = 1
  51         else:
  52             p = p.partition("/")[0]
  53             bi = len(p) + 1
  54         if p in self.dir:
  55             sreq = req.shift(bi)
  56             sreq.selfpath = req.pathinfo[1:]
  57             return self.dir[p](sreq)
  58         raise resp.notfound()
  59
  60     def add(self, fun):
  61         self.dir[self.unwrap(fun).__name__] = fun
  62         return fun
  63
  64     def name(self, name):
  65         def dec(fun):
  66             self.dir[name] = fun
  67             return fun
  68         return dec
  69
  70 def persession(data=None):
  71     def dec(callable):
  72         def wrapper(req):
  73             sess = session.get(req)
  74             if callable not in sess:
  75                 if data is None:
  76                     sess[callable] = callable()
  77                 else:
  78                     if data not in sess:
  79                         sess[data] = data()
  80                     sess[callable] = callable(data)
  81             return sess[callable].handle(req)
  82         wrapper.__wrapped__ = callable
  83         return wrapper
  84     return dec
  85
  86 class preiter(object):
  87     __slots__ = ["bk", "bki", "_next"]
  88     end = object()
  89     def __init__(self, real):
  90         self.bk = real
  91         self.bki = iter(real)
  92         self._next = None
  93         self.next()
  94
  95     def __iter__(self):
  96         return self
  97
  98     def next(self):
  99         if self._next is self.end:
 100             raise StopIteration()
 101         ret = self._next
 102         try:
 103             self._next = next(self.bki)
 104         except StopIteration:
 105             self._next = self.end
 106         return ret
 107
 108     def close(self):
 109         if hasattr(self.bk, "close"):
 110             self.bk.close()
 111
 112 def pregen(callable):
 113     def wrapper(*args, **kwargs):
 114         return preiter(callable(*args, **kwargs))
 115     wrapper.__wrapped__ = callable
 116     return wrapper
 117
 118 class sessiondata(object):
 119     @classmethod
 120     def get(cls, req, create=True):
 121         sess = cls.sessdb().get(req)
 122         with sess.lock:
 123             try:
 124                 return sess[cls]
 125             except KeyError:
 126                 if not create:
 127                     return None
 128                 ret = cls(req, sess)
 129                 sess[cls] = ret
 130                 return ret
 131
 132     @classmethod
 133     def sessdb(cls):
 134         return session.default.val
 135
 136 class autodirty(sessiondata):
 137     @classmethod
 138     def get(cls, req):
 139         ret = super(autodirty, cls).get(req)
 140         if "_is_dirty" not in ret.__dict__:
 141             ret.__dict__["_is_dirty"] = False
 142         return ret
 143
 144     def sessfrozen(self):
 145         self.__dict__["_is_dirty"] = False
 146
 147     def sessdirty(self):
 148         return self._is_dirty
 149
 150     def __setattr__(self, name, value):
 151         super(autodirty, self).__setattr__(name, value)
 152         if "_is_dirty" in self.__dict__:
 153             self.__dict__["_is_dirty"] = True
 154
 155     def __delattr__(self, name):
 156         super(autodirty, self).__delattr__(name, value)
 157         if "_is_dirty" in self.__dict__:
 158             self.__dict__["_is_dirty"] = True
 159
 160 class manudirty(object):
 161     def __init__(self, *args, **kwargs):
 162         super(manudirty, self).__init__(*args, **kwargs)
 163         self.__dirty = False
 164
 165     def sessfrozen(self):
 166         self.__dirty = False
 167
 168     def sessdirty(self):
 169         return self.__dirty
 170
 171     def dirty(self):
 172         self.__dirty = True
 173
 174 class specslot(object):
 175     __slots__ = ["nm", "idx", "dirty"]
 176     unbound = object()
 177
 178     def __init__(self, nm, idx, dirty):
 179         self.nm = nm
 180         self.idx = idx
 181         self.dirty = dirty
 182
 183     @staticmethod
 184     def slist(ins):
 185         # Avoid calling __getattribute__
 186         return specdirty.__sslots__.__get__(ins, type(ins))
 187
 188     def __get__(self, ins, cls):
 189         val = self.slist(ins)[self.idx]
 190         if val is specslot.unbound:
 191             raise AttributeError("specslot %r is unbound" % self.nm)
 192         return val
 193
 194     def __set__(self, ins, val):
 195         self.slist(ins)[self.idx] = val
 196         if self.dirty:
 197             ins.dirty()
 198
 199     def __delete__(self, ins):
 200         self.slist(ins)[self.idx] = specslot.unbound
 201         ins.dirty()
 202
 203 class specclass(type):
 204     def __init__(self, name, bases, tdict):
 205         super(specclass, self).__init__(name, bases, tdict)
 206         sslots = set()
 207         dslots = set()
 208         for cls in self.__mro__:
 209             css = cls.__dict__.get("__saveslots__", ())
 210             sslots.update(css)
 211             dslots.update(cls.__dict__.get("__dirtyslots__", css))
 212         self.__sslots_l__ = list(sslots)
 213         self.__sslots_a__ = list(sslots | dslots)
 214         for i, slot in enumerate(self.__sslots_a__):
 215             setattr(self, slot, specslot(slot, i, slot in dslots))
 216
 217 class specdirty(sessiondata):
 218     __metaclass__ = specclass
 219     __slots__ = ["session", "__sslots__", "_is_dirty"]
 220
 221     def __specinit__(self):
 222         pass
 223
 224     @staticmethod
 225     def __new__(cls, req, sess):
 226         self = super(specdirty, cls).__new__(cls)
 227         self.session = sess
 228         self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
 229         self.__specinit__()
 230         self._is_dirty = False
 231         return self
 232
 233     def __getnewargs__(self):
 234         return (None, self.session)
 235
 236     def dirty(self):
 237         self._is_dirty = True
 238
 239     def sessfrozen(self):
 240         self._is_dirty = False
 241
 242     def sessdirty(self):
 243         return self._is_dirty
 244
 245     def __getstate__(self):
 246         ret = {}
 247         for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
 248             if val is specslot.unbound:
 249                 ret[nm] = False, None
 250             else:
 251                 ret[nm] = True, val
 252         return ret
 253
 254     def __setstate__(self, st):
 255         ss = specslot.slist(self)
 256         for i, nm in enumerate(type(self).__sslots_a__):
 257             bound, val = st.pop(nm, (False, None))
 258             if not bound:
 259                 ss[i] = specslot.unbound
 260             else:
 261                 ss[i] = val
 262
 263 def datecheck(req, mtime):
 264     if "If-Modified-Since" in req.ihead:
 265         rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
 266         if rtime is not None and rtime >= math.floor(mtime):
 267             raise resp.unmodified()
 268     req.ohead["Last-Modified"] = proto.httpdate(mtime)