python/ashd-wsgi

   1 #!/usr/bin/python
   2
   3 import sys, os, getopt, socket, logging, time, signal
   4 import ashd.util, ashd.serve
   5 try:
   6     import pdm.srv
   7 except:
   8     pdm = None
   9
  10 def usage(out):
  11     out.write("usage: ashd-wsgi [-hAL] [-m PDM-SPEC] [-p MODPATH] [-t REQUEST-HANDLER[:PAR[=VAL](,PAR[=VAL])...]] HANDLER-MODULE [ARGS...]\n")
  12
  13 hspec = "free", {}
  14 modwsgi_compat = False
  15 setlog = True
  16 opts, args = getopt.getopt(sys.argv[1:], "+hALp:t:l:m:")
  17 for o, a in opts:
  18     if o == "-h":
  19         usage(sys.stdout)
  20         sys.exit(0)
  21     elif o == "-p":
  22         sys.path.insert(0, a)
  23     elif o == "-L":
  24         setlog = False
  25     elif o == "-A":
  26         modwsgi_compat = True
  27     elif o == "-l":
  28         hspec = "free", {"max": a, "abort": "10"}
  29     elif o == "-t":
  30         hspec = ashd.serve.parsehspec(a)
  31     elif o == "-m":
  32         if pdm is not None:
  33             pdm.srv.listen(a)
  34 if len(args) < 1:
  35     usage(sys.stderr)
  36     sys.exit(1)
  37 if setlog:
  38     logging.basicConfig(format="ashd-wsgi(%(name)s): %(levelname)s: %(message)s")
  39 log = logging.getLogger("ashd-wsgi")
  40
  41 try:
  42     handlermod = __import__(args[0], fromlist = ["dummy"])
  43 except ImportError, exc:
  44     sys.stderr.write("ashd-wsgi: handler %s not found: %s\n" % (args[0], exc.message))
  45     sys.exit(1)
  46 if not modwsgi_compat:
  47     if not hasattr(handlermod, "wmain"):
  48         sys.stderr.write("ashd-wsgi: handler %s has no `wmain' function\n" % args[0])
  49         sys.exit(1)
  50     handler = handlermod.wmain(*args[1:])
  51 else:
  52     if not hasattr(handlermod, "application"):
  53         sys.stderr.write("ashd-wsgi: handler %s has no `application' object\n" % args[0])
  54         sys.exit(1)
  55     handler = handlermod.application
  56
  57 cwd = os.getcwd()
  58 def absolutify(path):
  59     if path[0] != '/':
  60         return os.path.join(cwd, path)
  61     return path
  62
  63 def unquoteurl(url):
  64     buf = ""
  65     i = 0
  66     while i < len(url):
  67         c = url[i]
  68         i += 1
  69         if c == '%':
  70             if len(url) >= i + 2:
  71                 c = 0
  72                 if '0' <= url[i] <= '9':
  73                     c |= (ord(url[i]) - ord('0')) << 4
  74                 elif 'a' <= url[i] <= 'f':
  75                     c |= (ord(url[i]) - ord('a') + 10) << 4
  76                 elif 'A' <= url[i] <= 'F':
  77                     c |= (ord(url[i]) - ord('A') + 10) << 4
  78                 else:
  79                     raise ValueError("Illegal URL escape character")
  80                 if '0' <= url[i + 1] <= '9':
  81                     c |= ord(url[i + 1]) - ord('0')
  82                 elif 'a' <= url[i + 1] <= 'f':
  83                     c |= ord(url[i + 1]) - ord('a') + 10
  84                 elif 'A' <= url[i + 1] <= 'F':
  85                     c |= ord(url[i + 1]) - ord('A') + 10
  86                 else:
  87                     raise ValueError("Illegal URL escape character")
  88                 buf += chr(c)
  89                 i += 2
  90             else:
  91                 raise ValueError("Incomplete URL escape character")
  92         else:
  93             buf += c
  94     return buf
  95
  96 def mkenv(req):
  97     env = {}
  98     env["wsgi.version"] = 1, 0
  99     for key, val in req.headers:
 100         env["HTTP_" + key.upper().replace("-", "_")] = val
 101     env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
 102     env["GATEWAY_INTERFACE"] = "CGI/1.1"
 103     env["SERVER_PROTOCOL"] = req.ver
 104     env["REQUEST_METHOD"] = req.method
 105     env["REQUEST_URI"] = req.url
 106     name = req.url
 107     p = name.find('?')
 108     if p >= 0:
 109         env["QUERY_STRING"] = name[p + 1:]
 110         name = name[:p]
 111     else:
 112         env["QUERY_STRING"] = ""
 113     if name[-len(req.rest):] == req.rest:
 114         # This is the same hack used in call*cgi.
 115         name = name[:-len(req.rest)]
 116     try:
 117         pi = unquoteurl(req.rest)
 118     except:
 119         pi = req.rest
 120     if name == '/':
 121         # This seems to be normal CGI behavior, but see callcgi.c for
 122         # details.
 123         pi = "/" + pi
 124         name = ""
 125     env["SCRIPT_NAME"] = name
 126     env["PATH_INFO"] = pi
 127     if "Host" in req: env["SERVER_NAME"] = req["Host"]
 128     if "X-Ash-Server-Address" in req: env["SERVER_ADDR"] = req["X-Ash-Server-Address"]
 129     if "X-Ash-Server-Port" in req: env["SERVER_PORT"] = req["X-Ash-Server-Port"]
 130     if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == "https": env["HTTPS"] = "on"
 131     if "X-Ash-Address" in req: env["REMOTE_ADDR"] = req["X-Ash-Address"]
 132     if "X-Ash-Port" in req: env["REMOTE_PORT"] = req["X-Ash-Port"]
 133     if "Content-Type" in req:
 134         env["CONTENT_TYPE"] = req["Content-Type"]
 135         # The CGI specification does not strictly require this, but
 136         # many actualy programs and libraries seem to.
 137         del env["HTTP_CONTENT_TYPE"]
 138     if "Content-Length" in req:
 139         env["CONTENT_LENGTH"] = req["Content-Length"]
 140         del env["HTTP_CONTENT_LENGTH"]
 141     if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"])
 142     if "X-Ash-Protocol" in req: env["wsgi.url_scheme"] = req["X-Ash-Protocol"]
 143     env["wsgi.input"] = req.sk
 144     env["wsgi.errors"] = sys.stderr
 145     env["wsgi.multithread"] = True
 146     env["wsgi.multiprocess"] = False
 147     env["wsgi.run_once"] = False
 148     return env
 149
 150 class request(ashd.serve.wsgirequest):
 151     def __init__(self, bkreq, **kw):
 152         super(request, self).__init__(**kw)
 153         self.bkreq = bkreq.dup()
 154
 155     def mkenv(self):
 156         return mkenv(self.bkreq)
 157
 158     def handlewsgi(self, env, startreq):
 159         return handler(env, startreq)
 160
 161     def fileno(self):
 162         return self.bkreq.bsk.fileno()
 163
 164     def writehead(self, status, headers):
 165         w = self.buffer.extend
 166         w("HTTP/1.1 %s\n" % status)
 167         for nm, val in headers:
 168             w("%s: %s\n" % (nm, val))
 169         w("\n")
 170
 171     def flush(self):
 172         try:
 173             ret = self.bkreq.bsk.send(self.buffer, socket.MSG_DONTWAIT)
 174             self.buffer[:ret] = ""
 175         except IOError:
 176             raise ashd.serve.closed()
 177
 178     def close(self):
 179         self.bkreq.close()
 180
 181 def handle(req):
 182     reqhandler.handle(request(bkreq=req, handler=reqhandler))
 183
 184 if hspec[0] not in ashd.serve.names:
 185     sys.stderr.write("ashd-wsgi: no such request handler: %s\n" % hspec[0])
 186     sys.exit(1)
 187 hclass = ashd.serve.names[hspec[0]]
 188 try:
 189     hargs = hclass.parseargs(**hspec[1])
 190 except ValueError as exc:
 191     sys.stderr.write("ashd-wsgi: %s\n" % exc)
 192     sys.exit(1)
 193
 194 def sigterm(sig, frame):
 195     socket.fromfd(0, socket.AF_UNIX, socket.SOCK_SEQPACKET).shutdown(socket.SHUT_RDWR) # :P
 196 for signum in [signal.SIGINT, signal.SIGTERM]:
 197     signal.signal(signum, sigterm)
 198
 199 reqhandler = hclass(**hargs)
 200 try:
 201     ashd.util.serveloop(handle)
 202 finally:
 203     reqhandler.close()