accesslog: Fixed up stdout logging and related FD_CLOEXEC usage.
[ashd.git] / python / ashd-wsgi
... / ...
CommitLineData
1#!/usr/bin/python
2
3import sys, os, getopt, threading, time
4import ashd.proto, ashd.util
5
6def usage(out):
7 out.write("usage: ashd-wsgi [-hA] [-p MODPATH] [-l REQLIMIT] HANDLER-MODULE [ARGS...]\n")
8
9reqlimit = 0
10modwsgi_compat = False
11opts, args = getopt.getopt(sys.argv[1:], "+hAp:l:")
12for o, a in opts:
13 if o == "-h":
14 usage(sys.stdout)
15 sys.exit(0)
16 elif o == "-p":
17 sys.path.insert(0, a)
18 elif o == "-A":
19 modwsgi_compat = True
20 elif o == "-l":
21 reqlimit = int(a)
22if len(args) < 1:
23 usage(sys.stderr)
24 sys.exit(1)
25
26try:
27 handlermod = __import__(args[0], fromlist = ["dummy"])
28except ImportError, exc:
29 sys.stderr.write("ashd-wsgi: handler %s not found: %s\n" % (args[0], exc.message))
30 sys.exit(1)
31if not modwsgi_compat:
32 if not hasattr(handlermod, "wmain"):
33 sys.stderr.write("ashd-wsgi: handler %s has no `wmain' function\n" % args[0])
34 sys.exit(1)
35 handler = handlermod.wmain(*args[1:])
36else:
37 if not hasattr(handlermod, "application"):
38 sys.stderr.write("ashd-wsgi: handler %s has no `application' object\n" % args[0])
39 sys.exit(1)
40 handler = handlermod.application
41
42class closed(IOError):
43 def __init__(self):
44 super(closed, self).__init__("The client has closed the connection.")
45
46cwd = os.getcwd()
47def absolutify(path):
48 if path[0] != '/':
49 return os.path.join(cwd, path)
50 return path
51
52def unquoteurl(url):
53 buf = ""
54 i = 0
55 while i < len(url):
56 c = url[i]
57 i += 1
58 if c == '%':
59 if len(url) >= i + 2:
60 c = 0
61 if '0' <= url[i] <= '9':
62 c |= (ord(url[i]) - ord('0')) << 4
63 elif 'a' <= url[i] <= 'f':
64 c |= (ord(url[i]) - ord('a') + 10) << 4
65 elif 'A' <= url[i] <= 'F':
66 c |= (ord(url[i]) - ord('A') + 10) << 4
67 else:
68 raise ValueError("Illegal URL escape character")
69 if '0' <= url[i + 1] <= '9':
70 c |= ord(url[i + 1]) - ord('0')
71 elif 'a' <= url[i + 1] <= 'f':
72 c |= ord(url[i + 1]) - ord('a') + 10
73 elif 'A' <= url[i + 1] <= 'F':
74 c |= ord(url[i + 1]) - ord('A') + 10
75 else:
76 raise ValueError("Illegal URL escape character")
77 buf += chr(c)
78 i += 2
79 else:
80 raise ValueError("Incomplete URL escape character")
81 else:
82 buf += c
83 return buf
84
85def dowsgi(req):
86 env = {}
87 env["wsgi.version"] = 1, 0
88 for key, val in req.headers:
89 env["HTTP_" + key.upper().replace("-", "_")] = val
90 env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
91 env["GATEWAY_INTERFACE"] = "CGI/1.1"
92 env["SERVER_PROTOCOL"] = req.ver
93 env["REQUEST_METHOD"] = req.method
94 env["REQUEST_URI"] = req.url
95 try:
96 env["PATH_INFO"] = unquoteurl(req.rest)
97 except:
98 env["PATH_INFO"] = req.rest
99 name = req.url
100 p = name.find('?')
101 if p >= 0:
102 env["QUERY_STRING"] = name[p + 1:]
103 name = name[:p]
104 else:
105 env["QUERY_STRING"] = ""
106 if name[-len(req.rest):] == req.rest:
107 name = name[:-len(req.rest)]
108 env["SCRIPT_NAME"] = name
109 if "Host" in req: env["SERVER_NAME"] = req["Host"]
110 if "X-Ash-Server-Port" in req: env["SERVER_PORT"] = req["X-Ash-Server-Port"]
111 if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == "https": env["HTTPS"] = "on"
112 if "X-Ash-Address" in req: env["REMOTE_ADDR"] = req["X-Ash-Address"]
113 if "Content-Type" in req: env["CONTENT_TYPE"] = req["Content-Type"]
114 if "Content-Length" in req: env["CONTENT_LENGTH"] = req["Content-Length"]
115 if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"])
116 if "X-Ash-Protocol" in req: env["wsgi.url_scheme"] = req["X-Ash-Protocol"]
117 env["wsgi.input"] = req.sk
118 env["wsgi.errors"] = sys.stderr
119 env["wsgi.multithread"] = True
120 env["wsgi.multiprocess"] = False
121 env["wsgi.run_once"] = False
122
123 resp = []
124 respsent = []
125
126 def flushreq():
127 if not respsent:
128 if not resp:
129 raise Exception, "Trying to write data before starting response."
130 status, headers = resp
131 respsent[:] = [True]
132 try:
133 req.sk.write("HTTP/1.1 %s\n" % status)
134 for nm, val in headers:
135 req.sk.write("%s: %s\n" % (nm, val))
136 req.sk.write("\n")
137 except IOError:
138 raise closed()
139
140 def write(data):
141 if not data:
142 return
143 flushreq()
144 try:
145 req.sk.write(data)
146 req.sk.flush()
147 except IOError:
148 raise closed()
149
150 def startreq(status, headers, exc_info = None):
151 if resp:
152 if exc_info: # Interesting, this...
153 try:
154 if respsent:
155 raise exc_info[0], exc_info[1], exc_info[2]
156 finally:
157 exc_info = None # CPython GC bug?
158 else:
159 raise Exception, "Can only start responding once."
160 resp[:] = status, headers
161 return write
162
163 respiter = handler(env, startreq)
164 try:
165 try:
166 for data in respiter:
167 write(data)
168 if resp:
169 flushreq()
170 except closed:
171 pass
172 finally:
173 if hasattr(respiter, "close"):
174 respiter.close()
175
176flightlock = threading.Condition()
177inflight = 0
178
179class reqthread(threading.Thread):
180 def __init__(self, req):
181 super(reqthread, self).__init__(name = "Request handler")
182 self.req = req.dup()
183
184 def run(self):
185 global inflight
186 try:
187 flightlock.acquire()
188 try:
189 if reqlimit != 0:
190 start = time.time()
191 while inflight >= reqlimit:
192 flightlock.wait(10)
193 if time.time() - start > 10:
194 os.abort()
195 inflight += 1
196 finally:
197 flightlock.release()
198 try:
199 dowsgi(self.req)
200 finally:
201 flightlock.acquire()
202 try:
203 inflight -= 1
204 flightlock.notify()
205 finally:
206 flightlock.release()
207 finally:
208 self.req.close()
209
210def handle(req):
211 reqthread(req).start()
212
213ashd.util.serveloop(handle)