wrw/util.py

   1 import inspect
   2 from . import req, dispatch, session, form
   3
   4 def wsgiwrap(callable):
   5     def wrapper(env, startreq):
   6         return dispatch.handle(req.origrequest(env), startreq, callable)
   7     return wrapper
   8
   9 def stringwrap(charset):
  10     def dec(callable):
  11         def wrapper(*args, **kwargs):
  12             bk = callable(*args, **kwargs)
  13             for string in bk:
  14                 yield string.encode(charset)
  15         return wrapper
  16     return dec
  17
  18 def formparams(callable):
  19     def wrapper(req):
  20         data = form.formdata(req)
  21         spec = inspect.getargspec(callable)
  22         args = dict(data.items())
  23         args["req"] = req
  24         if not spec.keywords:
  25             for arg in list(args):
  26                 if arg not in spec.args:
  27                     del args[arg]
  28         return callable(**args)
  29     return wrapper
  30
  31 def persession(data = None):
  32     def dec(callable):
  33         def wrapper(req):
  34             sess = session.get(req)
  35             if callable not in sess:
  36                 if data is None:
  37                     sess[callable] = callable()
  38                 else:
  39                     if data not in sess:
  40                         sess[data] = data()
  41                     sess[callable] = callable(data)
  42             return sess[callable].handle(req)
  43         return wrapper
  44     return dec
  45
  46 class sessiondata(object):
  47     @classmethod
  48     def get(cls, req, create = True):
  49         sess = cls.sessdb().get(req)
  50         with sess.lock:
  51             try:
  52                 return sess[cls]
  53             except KeyError:
  54                 if not create:
  55                     return None
  56                 ret = cls(req)
  57                 sess[cls] = ret
  58                 return ret
  59
  60     @classmethod
  61     def sessdb(cls):
  62         return session.default.val
  63
  64 class autodirty(sessiondata):
  65     @classmethod
  66     def get(cls, req):
  67         ret = super().get(req)
  68         if "_is_dirty" not in ret.__dict__:
  69             ret.__dict__["_is_dirty"] = False
  70         return ret
  71
  72     def sessfrozen(self):
  73         self.__dict__["_is_dirty"] = False
  74
  75     def sessdirty(self):
  76         return self._is_dirty
  77
  78     def __setattr__(self, name, value):
  79         super().__setattr__(name, value)
  80         if "_is_dirty" in self.__dict__:
  81             self.__dict__["_is_dirty"] = True
  82
  83     def __delattr__(self, name):
  84         super().__delattr__(name, value)
  85         if "_is_dirty" in self.__dict__:
  86             self.__dict__["_is_dirty"] = True
  87
  88 class manudirty(object):
  89     def __init__(self, *args, **kwargs):
  90         super().__init__(*args, **kwargs)
  91         self.__dirty = False
  92
  93     def sessfrozen(self):
  94         self.__dirty = False
  95
  96     def sessdirty(self):
  97         return self.__dirty
  98
  99     def dirty(self):
 100         self.__dirty = True