Made requests shallow-cloneable.
[wrw.git] / wrw / req.py
1 __all__ = ["request"]
2
3 class headdict(object):
4     def __init__(self):
5         self.dict = {}
6
7     def __getitem__(self, key):
8         return self.dict[key.lower()][1]
9
10     def __setitem__(self, key, val):
11         self.dict[key.lower()] = [key, val]
12
13     def __contains__(self, key):
14         return key.lower() in self.dict
15
16     def __delitem__(self, key):
17         del self.dict[key.lower()]
18
19     def __iter__(self):
20         return iter((list[0] for list in self.dict.itervalues()))
21     
22     def get(self, key, default = ""):
23         if key.lower() in self.dict:
24             return self.dict[key.lower()][1]
25         return default
26
27     def getlist(self, key):
28         return self.dict.setdefault(key.lower(), [key])[1:]
29
30     def add(self, key, val):
31         self.dict.setdefault(key.lower(), [key]).append(val)
32
33     def __repr__(self):
34         return repr(self.dict)
35
36     def __str__(self):
37         return str(self.dict)
38
39 def fixcase(str):
40     str = str.lower()
41     i = 0
42     b = True
43     while i < len(str):
44         if b:
45             str = str[:i] + str[i].upper() + str[i + 1:]
46         b = False
47         if str[i] == '-':
48             b = True
49         i += 1
50     return str
51
52 class request(object):
53     def copy(self):
54         return copyrequest(self)
55
56     def shift(self, n):
57         new = self.copy()
58         new.uriname = self.uriname + self.pathinfo[:n]
59         new.pathinfo = self.pathinfo[n:]
60         return new
61
62 class origrequest(request):
63     def __init__(self, env):
64         self.env = env
65         self.uriname = env["SCRIPT_NAME"]
66         self.filename = env.get("SCRIPT_FILENAME")
67         self.uri = env["REQUEST_URI"]
68         self.pathinfo = env["PATH_INFO"]
69         self.query = env["QUERY_STRING"]
70         self.remoteaddr = env["REMOTE_ADDR"]
71         self.serverport = env["SERVER_PORT"]
72         self.https = "HTTPS" in env
73         self.ihead = headdict()
74         self.ohead = headdict()
75         for k, v in env.items():
76             if k[:5] == "HTTP_":
77                 self.ihead.add(fixcase(k[5:].replace("_", "-")), v)
78         self.items = {}
79         self.statuscode = (200, "OK")
80         self.ohead["Content-Type"] = "text/html"
81         self.resources = set()
82         self.clean = set()
83         self.commitfuns = []
84
85     def status(self, code, msg):
86         self.statuscode = code, msg
87
88     def item(self, id):
89         if id in self.items:
90             return self.items[id]
91         self.items[id] = new = id(self)
92         if hasattr(new, "__enter__") and hasattr(new, "__exit__"):
93             self.withres(new)
94         return new
95
96     def withres(self, res):
97         if res not in self.resources:
98             done = False
99             res.__enter__()
100             try:
101                 self.resources.add(res)
102                 self.clean.add(res.__exit__)
103                 done = True
104             finally:
105                 if not done:
106                     res.__exit__(None, None, None)
107                     self.resources.discard(res)
108
109     def cleanup(self):
110         def clean1(list):
111             if len(list) > 0:
112                 try:
113                     list[0]()
114                 finally:
115                     clean1(list[1:])
116         clean1(list(self.clean))
117
118     def oncommit(self, fn):
119         if fn not in self.commitfuns:
120             self.commitfuns.append(fn)
121
122     def commit(self, startreq):
123         for fun in reversed(self.commitfuns):
124             fun(self)
125         hdrs = []
126         for nm in self.ohead:
127             for val in self.ohead.getlist(nm):
128                 hdrs.append((nm, val))
129         startreq("%s %s" % self.statuscode, hdrs)
130
131     def topreq(self):
132         return self
133
134 class copyrequest(request):
135     def __init__(self, p):
136         self.parent = p
137         self.top = p.topreq()
138         self.env = p.env
139         self.uriname = p.uriname
140         self.filename = p.filename
141         self.uri = p.uri
142         self.pathinfo = p.pathinfo
143         self.query = p.query
144         self.remoteaddr = p.remoteaddr
145         self.serverport = p.serverport
146         self.https = p.https
147         self.ihead = p.ihead
148         self.ohead = p.ohead
149
150     def status(self, code, msg):
151         return self.parent.status(code, msg)
152
153     def item(self, id):
154         return self.top.item(id)
155
156     def withres(self, res):
157         return self.top.withres(res)
158
159     def oncommit(self, fn):
160         return self.top.oncommit(fn)
161
162     def topreq(self):
163         return self.parent.topreq()