Merge branch 'master' into python3
[wrw.git] / wrw / util.py
CommitLineData
1864be32 1import inspect, math
2a5a8ce7 2from . import 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
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10def stringwrap(charset):
11 def dec(callable):
12 def wrapper(*args, **kwargs):
13 bk = callable(*args, **kwargs)
14 for string in bk:
15 yield string.encode(charset)
16 return wrapper
17 return dec
18
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19def formparams(callable):
20 def wrapper(req):
21 data = form.formdata(req)
22 spec = inspect.getargspec(callable)
23 args = dict(data.items())
24 args["req"] = req
25 if not spec.keywords:
26 for arg in list(args):
27 if arg not in spec.args:
28 del args[arg]
fd7af0a2 29 for i in range(len(spec.args) - len(spec.defaults)):
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30 if spec.args[i] not in args:
31 raise resp.httperror(400, "Missing parameter", ("The query parameter `", resp.h.code(spec.args[i]), "' is required but not supplied."))
bbdebbab 32 return callable(**args)
0f18b774 33 wrapper.__wrapped__ = callable
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34 return wrapper
35
525d7938 36def funplex(*funs, **nfuns):
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37 def unwrap(fun):
38 while hasattr(fun, "__wrapped__"):
39 fun = fun.__wrapped__
40 return fun
525d7938 41 dir = {}
24e514f0 42 dir.update(((unwrap(fun).__name__, fun) for fun in funs))
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43 dir.update(nfuns)
44 def handler(req):
45 if req.pathinfo == "":
46 raise resp.redirect(req.uriname + "/")
47 if req.pathinfo[:1] != "/":
48 raise resp.notfound()
49 p = req.pathinfo[1:]
50 if p == "":
51 p = "__index__"
52 bi = 1
53 else:
54 p = p.partition("/")[0]
55 bi = len(p) + 1
56 if p in dir:
57 return dir[p](req.shift(bi))
58 raise resp.notfound()
59 return handler
60
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61def persession(data = None):
62 def dec(callable):
63 def wrapper(req):
64 sess = session.get(req)
65 if callable not in sess:
66 if data is None:
67 sess[callable] = callable()
68 else:
69 if data not in sess:
70 sess[data] = data()
71 sess[callable] = callable(data)
72 return sess[callable].handle(req)
0f18b774 73 wrapper.__wrapped__ = callable
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74 return wrapper
75 return dec
d1f70c6c 76
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77class preiter(object):
78 __slots__ = ["bk", "bki", "_next"]
79 end = object()
80 def __init__(self, real):
81 self.bk = real
82 self.bki = iter(real)
83 self._next = None
a7a09080 84 self.__next__()
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85
86 def __iter__(self):
87 return self
88
a7a09080 89 def __next__(self):
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90 if self._next is self.end:
91 raise StopIteration()
92 ret = self._next
93 try:
94 self._next = next(self.bki)
95 except StopIteration:
96 self._next = self.end
97 return ret
98
99 def close(self):
100 if hasattr(self.bk, "close"):
101 self.bk.close()
102
103def pregen(callable):
104 def wrapper(*args, **kwargs):
105 return preiter(callable(*args, **kwargs))
0f18b774 106 wrapper.__wrapped__ = callable
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107 return wrapper
108
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109class sessiondata(object):
110 @classmethod
8f911ff6 111 def get(cls, req, create = True):
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112 sess = cls.sessdb().get(req)
113 with sess.lock:
114 try:
115 return sess[cls]
116 except KeyError:
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117 if not create:
118 return None
5b35322c 119 ret = cls(req, sess)
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120 sess[cls] = ret
121 return ret
122
123 @classmethod
124 def sessdb(cls):
1f61bf31 125 return session.default.val
d1f70c6c 126
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127class autodirty(sessiondata):
128 @classmethod
129 def get(cls, req):
d13a1a57 130 ret = super().get(req)
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131 if "_is_dirty" not in ret.__dict__:
132 ret.__dict__["_is_dirty"] = False
617b21df 133 return ret
f13b8f5a 134
d1f70c6c 135 def sessfrozen(self):
f13b8f5a 136 self.__dict__["_is_dirty"] = False
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137
138 def sessdirty(self):
f13b8f5a 139 return self._is_dirty
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140
141 def __setattr__(self, name, value):
a4ad119b 142 super().__setattr__(name, value)
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143 if "_is_dirty" in self.__dict__:
144 self.__dict__["_is_dirty"] = True
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145
146 def __delattr__(self, name):
d13a1a57 147 super().__delattr__(name, value)
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148 if "_is_dirty" in self.__dict__:
149 self.__dict__["_is_dirty"] = True
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150
151class manudirty(object):
152 def __init__(self, *args, **kwargs):
d13a1a57 153 super().__init__(*args, **kwargs)
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154 self.__dirty = False
155
156 def sessfrozen(self):
157 self.__dirty = False
158
159 def sessdirty(self):
160 return self.__dirty
161
162 def dirty(self):
163 self.__dirty = True
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164
165class specslot(object):
166 __slots__ = ["nm", "idx", "dirty"]
167 unbound = object()
168
169 def __init__(self, nm, idx, dirty):
170 self.nm = nm
171 self.idx = idx
172 self.dirty = dirty
173
174 @staticmethod
175 def slist(ins):
176 # Avoid calling __getattribute__
177 return specdirty.__sslots__.__get__(ins, type(ins))
178
179 def __get__(self, ins, cls):
180 val = self.slist(ins)[self.idx]
181 if val is specslot.unbound:
182 raise AttributeError("specslot %r is unbound" % self.nm)
183 return val
184
185 def __set__(self, ins, val):
186 self.slist(ins)[self.idx] = val
187 if self.dirty:
188 ins.dirty()
189
190 def __delete__(self, ins):
191 self.slist(ins)[self.idx] = specslot.unbound
192 ins.dirty()
193
194class specclass(type):
195 def __init__(self, name, bases, tdict):
f605aaf2 196 super().__init__(name, bases, tdict)
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197 sslots = set()
198 dslots = set()
199 for cls in self.__mro__:
200 css = cls.__dict__.get("__saveslots__", ())
201 sslots.update(css)
202 dslots.update(cls.__dict__.get("__dirtyslots__", css))
203 self.__sslots_l__ = list(sslots)
204 self.__sslots_a__ = list(sslots | dslots)
205 for i, slot in enumerate(self.__sslots_a__):
206 setattr(self, slot, specslot(slot, i, slot in dslots))
207
f605aaf2 208class specdirty(sessiondata, metaclass=specclass):
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209 __slots__ = ["session", "__sslots__", "_is_dirty"]
210
211 def __specinit__(self):
212 pass
213
214 @staticmethod
215 def __new__(cls, req, sess):
f605aaf2 216 self = super().__new__(cls)
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217 self.session = sess
218 self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
219 self.__specinit__()
220 self._is_dirty = False
221 return self
222
223 def __getnewargs__(self):
224 return (None, self.session)
225
226 def dirty(self):
227 self._is_dirty = True
228
229 def sessfrozen(self):
230 self._is_dirty = False
231
232 def sessdirty(self):
233 return self._is_dirty
234
235 def __getstate__(self):
236 ret = {}
237 for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
238 if val is specslot.unbound:
239 ret[nm] = False, None
240 else:
241 ret[nm] = True, val
242 return ret
243
244 def __setstate__(self, st):
245 ss = specslot.slist(self)
246 for i, nm in enumerate(type(self).__sslots_a__):
247 bound, val = st.pop(nm, (False, None))
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248 if not bound:
249 ss[i] = specslot.unbound
250 else:
251 ss[i] = val
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252
253def datecheck(req, mtime):
254 if "If-Modified-Since" in req.ihead:
255 rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
256 if rtime >= math.floor(mtime):
257 raise resp.unmodified()
258 req.ohead["Last-Modified"] = proto.httpdate(mtime)