Merge branch 'master' into python3
[wrw.git] / wrw / util.py
CommitLineData
1864be32 1import inspect, math
2a5a8ce7 2from . import req, dispatch, session, form, resp, proto
b409a338
FT
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
FT
12 def wrapper(req):
13 data = form.formdata(req)
bbdebbab
FT
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]
babf3e21 20 for i in range(len(spec.args) - (len(spec.defaults) if spec.defaults else 0)):
5a071401
FT
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
bbdebbab
FT
25 return wrapper
26
612eb9f5
FT
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
24e514f0
FT
34 def unwrap(fun):
35 while hasattr(fun, "__wrapped__"):
36 fun = fun.__wrapped__
37 return fun
612eb9f5
FT
38
39 def __call__(self, req):
525d7938
FT
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
612eb9f5
FT
51 if p in self.dir:
52 return self.dir[p](req.shift(bi))
525d7938 53 raise resp.notfound()
612eb9f5
FT
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):
d9979128
FT
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
d9979128
FT
78 return wrapper
79 return dec
d1f70c6c 80
77dd732a
FT
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
a7a09080 88 self.__next__()
77dd732a
FT
89
90 def __iter__(self):
91 return self
92
a7a09080 93 def __next__(self):
77dd732a
FT
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
77dd732a
FT
111 return wrapper
112
62113fc6
FT
113def stringwrap(charset):
114 def dec(callable):
115 @pregen
116 def wrapper(*args, **kwargs):
117 for string in callable(*args, **kwargs):
118 yield string.encode(charset)
119 wrapper.__wrapped__ = callable
120 return wrapper
121 return dec
122
d1f70c6c
FT
123class sessiondata(object):
124 @classmethod
9bc70dab 125 def get(cls, req, create=True):
d1f70c6c
FT
126 sess = cls.sessdb().get(req)
127 with sess.lock:
128 try:
129 return sess[cls]
130 except KeyError:
8f911ff6
FT
131 if not create:
132 return None
5b35322c 133 ret = cls(req, sess)
d1f70c6c
FT
134 sess[cls] = ret
135 return ret
136
137 @classmethod
138 def sessdb(cls):
1f61bf31 139 return session.default.val
d1f70c6c 140
f13b8f5a
FT
141class autodirty(sessiondata):
142 @classmethod
143 def get(cls, req):
d13a1a57 144 ret = super().get(req)
f13b8f5a
FT
145 if "_is_dirty" not in ret.__dict__:
146 ret.__dict__["_is_dirty"] = False
617b21df 147 return ret
f13b8f5a 148
d1f70c6c 149 def sessfrozen(self):
f13b8f5a 150 self.__dict__["_is_dirty"] = False
d1f70c6c
FT
151
152 def sessdirty(self):
f13b8f5a 153 return self._is_dirty
d1f70c6c
FT
154
155 def __setattr__(self, name, value):
a4ad119b 156 super().__setattr__(name, value)
f13b8f5a
FT
157 if "_is_dirty" in self.__dict__:
158 self.__dict__["_is_dirty"] = True
d1f70c6c
FT
159
160 def __delattr__(self, name):
d13a1a57 161 super().__delattr__(name, value)
f13b8f5a
FT
162 if "_is_dirty" in self.__dict__:
163 self.__dict__["_is_dirty"] = True
3b9bc700
FT
164
165class manudirty(object):
166 def __init__(self, *args, **kwargs):
d13a1a57 167 super().__init__(*args, **kwargs)
3b9bc700
FT
168 self.__dirty = False
169
170 def sessfrozen(self):
171 self.__dirty = False
172
173 def sessdirty(self):
174 return self.__dirty
175
176 def dirty(self):
177 self.__dirty = True
df5f7868
FT
178
179class specslot(object):
180 __slots__ = ["nm", "idx", "dirty"]
181 unbound = object()
182
183 def __init__(self, nm, idx, dirty):
184 self.nm = nm
185 self.idx = idx
186 self.dirty = dirty
187
188 @staticmethod
189 def slist(ins):
190 # Avoid calling __getattribute__
191 return specdirty.__sslots__.__get__(ins, type(ins))
192
193 def __get__(self, ins, cls):
194 val = self.slist(ins)[self.idx]
195 if val is specslot.unbound:
196 raise AttributeError("specslot %r is unbound" % self.nm)
197 return val
198
199 def __set__(self, ins, val):
200 self.slist(ins)[self.idx] = val
201 if self.dirty:
202 ins.dirty()
203
204 def __delete__(self, ins):
205 self.slist(ins)[self.idx] = specslot.unbound
206 ins.dirty()
207
208class specclass(type):
209 def __init__(self, name, bases, tdict):
f605aaf2 210 super().__init__(name, bases, tdict)
df5f7868
FT
211 sslots = set()
212 dslots = set()
213 for cls in self.__mro__:
214 css = cls.__dict__.get("__saveslots__", ())
215 sslots.update(css)
216 dslots.update(cls.__dict__.get("__dirtyslots__", css))
217 self.__sslots_l__ = list(sslots)
218 self.__sslots_a__ = list(sslots | dslots)
219 for i, slot in enumerate(self.__sslots_a__):
220 setattr(self, slot, specslot(slot, i, slot in dslots))
221
f605aaf2 222class specdirty(sessiondata, metaclass=specclass):
df5f7868
FT
223 __slots__ = ["session", "__sslots__", "_is_dirty"]
224
225 def __specinit__(self):
226 pass
227
228 @staticmethod
229 def __new__(cls, req, sess):
f605aaf2 230 self = super().__new__(cls)
df5f7868
FT
231 self.session = sess
232 self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
233 self.__specinit__()
234 self._is_dirty = False
235 return self
236
237 def __getnewargs__(self):
238 return (None, self.session)
239
240 def dirty(self):
241 self._is_dirty = True
242
243 def sessfrozen(self):
244 self._is_dirty = False
245
246 def sessdirty(self):
247 return self._is_dirty
248
249 def __getstate__(self):
250 ret = {}
251 for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
252 if val is specslot.unbound:
253 ret[nm] = False, None
254 else:
255 ret[nm] = True, val
256 return ret
257
258 def __setstate__(self, st):
259 ss = specslot.slist(self)
260 for i, nm in enumerate(type(self).__sslots_a__):
261 bound, val = st.pop(nm, (False, None))
df5f7868
FT
262 if not bound:
263 ss[i] = specslot.unbound
264 else:
265 ss[i] = val
1864be32
FT
266
267def datecheck(req, mtime):
268 if "If-Modified-Since" in req.ihead:
269 rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
270 if rtime >= math.floor(mtime):
271 raise resp.unmodified()
272 req.ohead["Last-Modified"] = proto.httpdate(mtime)