Allow setting attributes to None as a noop, for convenience.
[wrw.git] / wrw / util.py
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1import inspect, math
2import req, dispatch, session, form, resp, proto
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3
4def wsgiwrap(callable):
5 def wrapper(env, startreq):
7450e2fc 6 return dispatch.handleenv(env, startreq, callable)
0f18b774 7 wrapper.__wrapped__ = callable
b409a338 8 return wrapper
d9979128 9
bbdebbab 10def formparams(callable):
f639ac81 11 spec = inspect.getargspec(callable)
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12 def wrapper(req):
13 data = form.formdata(req)
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14 args = dict(data.items())
15 args["req"] = req
16 if not spec.keywords:
17 for arg in list(args):
18 if arg not in spec.args:
19 del args[arg]
22dd9227 20 for i in xrange(len(spec.args) - (len(spec.defaults) if spec.defaults else 0)):
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21 if spec.args[i] not in args:
22 raise resp.httperror(400, "Missing parameter", ("The query parameter `", resp.h.code(spec.args[i]), "' is required but not supplied."))
bbdebbab 23 return callable(**args)
0f18b774 24 wrapper.__wrapped__ = callable
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25 return wrapper
26
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27class funplex(object):
28 def __init__(self, *funs, **nfuns):
29 self.dir = {}
30 self.dir.update(((self.unwrap(fun).__name__, fun) for fun in funs))
31 self.dir.update(nfuns)
32
33 @staticmethod
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34 def unwrap(fun):
35 while hasattr(fun, "__wrapped__"):
36 fun = fun.__wrapped__
37 return fun
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38
39 def __call__(self, req):
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40 if req.pathinfo == "":
41 raise resp.redirect(req.uriname + "/")
42 if req.pathinfo[:1] != "/":
43 raise resp.notfound()
44 p = req.pathinfo[1:]
45 if p == "":
46 p = "__index__"
47 bi = 1
48 else:
49 p = p.partition("/")[0]
50 bi = len(p) + 1
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51 if p in self.dir:
52 return self.dir[p](req.shift(bi))
525d7938 53 raise resp.notfound()
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54
55 def add(self, fun):
56 self.dir[self.unwrap(fun).__name__] = fun
57 return fun
58
59 def name(self, name):
60 def dec(fun):
61 self.dir[name] = fun
62 return fun
63 return dec
525d7938 64
9bc70dab 65def persession(data=None):
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66 def dec(callable):
67 def wrapper(req):
68 sess = session.get(req)
69 if callable not in sess:
70 if data is None:
71 sess[callable] = callable()
72 else:
73 if data not in sess:
74 sess[data] = data()
75 sess[callable] = callable(data)
76 return sess[callable].handle(req)
0f18b774 77 wrapper.__wrapped__ = callable
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78 return wrapper
79 return dec
d1f70c6c 80
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81class preiter(object):
82 __slots__ = ["bk", "bki", "_next"]
83 end = object()
84 def __init__(self, real):
85 self.bk = real
86 self.bki = iter(real)
87 self._next = None
88 self.next()
89
90 def __iter__(self):
91 return self
92
93 def next(self):
94 if self._next is self.end:
95 raise StopIteration()
96 ret = self._next
97 try:
98 self._next = next(self.bki)
99 except StopIteration:
100 self._next = self.end
101 return ret
102
103 def close(self):
104 if hasattr(self.bk, "close"):
105 self.bk.close()
106
107def pregen(callable):
108 def wrapper(*args, **kwargs):
109 return preiter(callable(*args, **kwargs))
0f18b774 110 wrapper.__wrapped__ = callable
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111 return wrapper
112
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113class sessiondata(object):
114 @classmethod
9bc70dab 115 def get(cls, req, create=True):
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116 sess = cls.sessdb().get(req)
117 with sess.lock:
118 try:
119 return sess[cls]
120 except KeyError:
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121 if not create:
122 return None
5b35322c 123 ret = cls(req, sess)
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124 sess[cls] = ret
125 return ret
126
127 @classmethod
128 def sessdb(cls):
1f61bf31 129 return session.default.val
d1f70c6c 130
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131class autodirty(sessiondata):
132 @classmethod
133 def get(cls, req):
134 ret = super(autodirty, cls).get(req)
135 if "_is_dirty" not in ret.__dict__:
136 ret.__dict__["_is_dirty"] = False
617b21df 137 return ret
f13b8f5a 138
d1f70c6c 139 def sessfrozen(self):
f13b8f5a 140 self.__dict__["_is_dirty"] = False
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141
142 def sessdirty(self):
f13b8f5a 143 return self._is_dirty
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144
145 def __setattr__(self, name, value):
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146 super(autodirty, self).__setattr__(name, value)
147 if "_is_dirty" in self.__dict__:
148 self.__dict__["_is_dirty"] = True
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149
150 def __delattr__(self, name):
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151 super(autodirty, self).__delattr__(name, value)
152 if "_is_dirty" in self.__dict__:
153 self.__dict__["_is_dirty"] = True
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154
155class manudirty(object):
156 def __init__(self, *args, **kwargs):
157 super(manudirty, self).__init__(*args, **kwargs)
158 self.__dirty = False
159
160 def sessfrozen(self):
161 self.__dirty = False
162
163 def sessdirty(self):
164 return self.__dirty
165
166 def dirty(self):
167 self.__dirty = True
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168
169class specslot(object):
170 __slots__ = ["nm", "idx", "dirty"]
171 unbound = object()
172
173 def __init__(self, nm, idx, dirty):
174 self.nm = nm
175 self.idx = idx
176 self.dirty = dirty
177
178 @staticmethod
179 def slist(ins):
180 # Avoid calling __getattribute__
181 return specdirty.__sslots__.__get__(ins, type(ins))
182
183 def __get__(self, ins, cls):
184 val = self.slist(ins)[self.idx]
185 if val is specslot.unbound:
186 raise AttributeError("specslot %r is unbound" % self.nm)
187 return val
188
189 def __set__(self, ins, val):
190 self.slist(ins)[self.idx] = val
191 if self.dirty:
192 ins.dirty()
193
194 def __delete__(self, ins):
195 self.slist(ins)[self.idx] = specslot.unbound
196 ins.dirty()
197
198class specclass(type):
199 def __init__(self, name, bases, tdict):
200 super(specclass, self).__init__(name, bases, tdict)
201 sslots = set()
202 dslots = set()
203 for cls in self.__mro__:
204 css = cls.__dict__.get("__saveslots__", ())
205 sslots.update(css)
206 dslots.update(cls.__dict__.get("__dirtyslots__", css))
207 self.__sslots_l__ = list(sslots)
208 self.__sslots_a__ = list(sslots | dslots)
209 for i, slot in enumerate(self.__sslots_a__):
210 setattr(self, slot, specslot(slot, i, slot in dslots))
211
212class specdirty(sessiondata):
213 __metaclass__ = specclass
214 __slots__ = ["session", "__sslots__", "_is_dirty"]
215
216 def __specinit__(self):
217 pass
218
219 @staticmethod
220 def __new__(cls, req, sess):
221 self = super(specdirty, cls).__new__(cls)
222 self.session = sess
223 self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
224 self.__specinit__()
225 self._is_dirty = False
226 return self
227
228 def __getnewargs__(self):
229 return (None, self.session)
230
231 def dirty(self):
232 self._is_dirty = True
233
234 def sessfrozen(self):
235 self._is_dirty = False
236
237 def sessdirty(self):
238 return self._is_dirty
239
240 def __getstate__(self):
241 ret = {}
242 for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
243 if val is specslot.unbound:
244 ret[nm] = False, None
245 else:
246 ret[nm] = True, val
247 return ret
248
249 def __setstate__(self, st):
250 ss = specslot.slist(self)
251 for i, nm in enumerate(type(self).__sslots_a__):
252 bound, val = st.pop(nm, (False, None))
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253 if not bound:
254 ss[i] = specslot.unbound
255 else:
256 ss[i] = val
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257
258def datecheck(req, mtime):
259 if "If-Modified-Since" in req.ihead:
260 rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
261 if rtime >= math.floor(mtime):
262 raise resp.unmodified()
263 req.ohead["Last-Modified"] = proto.httpdate(mtime)