Allow parurl to append to URLs that already have a query-string.
[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
bbdebbab 10def formparams(callable):
f639ac81 11 spec = inspect.getargspec(callable)
bbdebbab 12 def wrapper(req):
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13 try:
14 data = form.formdata(req)
15 except IOError:
16 raise resp.httperror(400, "Invalid request", "Form data was incomplete")
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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]
babf3e21 23 for i in range(len(spec.args) - (len(spec.defaults) if spec.defaults else 0)):
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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."))
bbdebbab 26 return callable(**args)
0f18b774 27 wrapper.__wrapped__ = callable
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28 return wrapper
29
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30class 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
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37 def unwrap(fun):
38 while hasattr(fun, "__wrapped__"):
39 fun = fun.__wrapped__
40 return fun
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41
42 def __call__(self, req):
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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
612eb9f5 54 if p in self.dir:
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55 sreq = req.shift(bi)
56 sreq.selfpath = req.pathinfo[1:]
57 return self.dir[p](sreq)
525d7938 58 raise resp.notfound()
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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
525d7938 69
9bc70dab 70def persession(data=None):
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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)
0f18b774 82 wrapper.__wrapped__ = callable
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83 return wrapper
84 return dec
d1f70c6c 85
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86class 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
a7a09080 93 self.__next__()
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94
95 def __iter__(self):
96 return self
97
a7a09080 98 def __next__(self):
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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
112def pregen(callable):
113 def wrapper(*args, **kwargs):
114 return preiter(callable(*args, **kwargs))
0f18b774 115 wrapper.__wrapped__ = callable
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116 return wrapper
117
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118def stringwrap(charset):
119 def dec(callable):
120 @pregen
121 def wrapper(*args, **kwargs):
122 for string in callable(*args, **kwargs):
123 yield string.encode(charset)
124 wrapper.__wrapped__ = callable
125 return wrapper
126 return dec
127
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128class sessiondata(object):
129 @classmethod
9bc70dab 130 def get(cls, req, create=True):
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131 sess = cls.sessdb().get(req)
132 with sess.lock:
133 try:
134 return sess[cls]
135 except KeyError:
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136 if not create:
137 return None
5b35322c 138 ret = cls(req, sess)
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139 sess[cls] = ret
140 return ret
141
142 @classmethod
143 def sessdb(cls):
1f61bf31 144 return session.default.val
d1f70c6c 145
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146class autodirty(sessiondata):
147 @classmethod
148 def get(cls, req):
d13a1a57 149 ret = super().get(req)
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150 if "_is_dirty" not in ret.__dict__:
151 ret.__dict__["_is_dirty"] = False
617b21df 152 return ret
f13b8f5a 153
d1f70c6c 154 def sessfrozen(self):
f13b8f5a 155 self.__dict__["_is_dirty"] = False
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156
157 def sessdirty(self):
f13b8f5a 158 return self._is_dirty
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159
160 def __setattr__(self, name, value):
a4ad119b 161 super().__setattr__(name, value)
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162 if "_is_dirty" in self.__dict__:
163 self.__dict__["_is_dirty"] = True
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164
165 def __delattr__(self, name):
d13a1a57 166 super().__delattr__(name, value)
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167 if "_is_dirty" in self.__dict__:
168 self.__dict__["_is_dirty"] = True
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169
170class manudirty(object):
171 def __init__(self, *args, **kwargs):
d13a1a57 172 super().__init__(*args, **kwargs)
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173 self.__dirty = False
174
175 def sessfrozen(self):
176 self.__dirty = False
177
178 def sessdirty(self):
179 return self.__dirty
180
181 def dirty(self):
182 self.__dirty = True
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183
184class specslot(object):
185 __slots__ = ["nm", "idx", "dirty"]
186 unbound = object()
187
188 def __init__(self, nm, idx, dirty):
189 self.nm = nm
190 self.idx = idx
191 self.dirty = dirty
192
193 @staticmethod
194 def slist(ins):
195 # Avoid calling __getattribute__
196 return specdirty.__sslots__.__get__(ins, type(ins))
197
198 def __get__(self, ins, cls):
199 val = self.slist(ins)[self.idx]
200 if val is specslot.unbound:
201 raise AttributeError("specslot %r is unbound" % self.nm)
202 return val
203
204 def __set__(self, ins, val):
205 self.slist(ins)[self.idx] = val
206 if self.dirty:
207 ins.dirty()
208
209 def __delete__(self, ins):
210 self.slist(ins)[self.idx] = specslot.unbound
211 ins.dirty()
212
213class specclass(type):
214 def __init__(self, name, bases, tdict):
f605aaf2 215 super().__init__(name, bases, tdict)
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216 sslots = set()
217 dslots = set()
218 for cls in self.__mro__:
219 css = cls.__dict__.get("__saveslots__", ())
220 sslots.update(css)
221 dslots.update(cls.__dict__.get("__dirtyslots__", css))
222 self.__sslots_l__ = list(sslots)
223 self.__sslots_a__ = list(sslots | dslots)
224 for i, slot in enumerate(self.__sslots_a__):
225 setattr(self, slot, specslot(slot, i, slot in dslots))
226
f605aaf2 227class specdirty(sessiondata, metaclass=specclass):
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228 __slots__ = ["session", "__sslots__", "_is_dirty"]
229
230 def __specinit__(self):
231 pass
232
233 @staticmethod
234 def __new__(cls, req, sess):
f605aaf2 235 self = super().__new__(cls)
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236 self.session = sess
237 self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
238 self.__specinit__()
239 self._is_dirty = False
240 return self
241
242 def __getnewargs__(self):
243 return (None, self.session)
244
245 def dirty(self):
246 self._is_dirty = True
247
248 def sessfrozen(self):
249 self._is_dirty = False
250
251 def sessdirty(self):
252 return self._is_dirty
253
254 def __getstate__(self):
255 ret = {}
256 for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
257 if val is specslot.unbound:
258 ret[nm] = False, None
259 else:
260 ret[nm] = True, val
261 return ret
262
263 def __setstate__(self, st):
264 ss = specslot.slist(self)
265 for i, nm in enumerate(type(self).__sslots_a__):
266 bound, val = st.pop(nm, (False, None))
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267 if not bound:
268 ss[i] = specslot.unbound
269 else:
270 ss[i] = val
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271
272def datecheck(req, mtime):
273 if "If-Modified-Since" in req.ihead:
274 rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
438b6207 275 if rtime is not None and rtime >= math.floor(mtime):
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276 raise resp.unmodified()
277 req.ohead["Last-Modified"] = proto.httpdate(mtime)