python/scgi-wsgi

   1 #!/usr/bin/python
   2
   3 import sys, os, getopt, logging
   4 import socket
   5 import ashd.scgi, ashd.perf, ashd.serve
   6 try:
   7     import pdm.srv
   8 except:
   9     pdm = None
  10
  11 def usage(out):
  12     out.write("usage: scgi-wsgi [-hAL] [-m PDM-SPEC] [-p MODPATH] [-T [HOST:]PORT] HANDLER-MODULE [ARGS...]\n")
  13
  14 sk = None
  15 modwsgi_compat = False
  16 setlog = True
  17 opts, args = getopt.getopt(sys.argv[1:], "+hALp:T:m:")
  18 for o, a in opts:
  19     if o == "-h":
  20         usage(sys.stdout)
  21         sys.exit(0)
  22     elif o == "-p":
  23         sys.path.insert(0, a)
  24     elif o == "-L":
  25         setlog = False
  26     elif o == "-T":
  27         sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  28         sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  29         p = a.rfind(":")
  30         if p < 0:
  31             bindhost = "localhost"
  32             bindport = int(a)
  33         else:
  34             bindhost = a[:p]
  35             bindport = int(a[p + 1:])
  36         sk.bind((bindhost, bindport))
  37         sk.listen(32)
  38     elif o == "-A":
  39         modwsgi_compat = True
  40     elif o == "-m":
  41         if pdm is not None:
  42             pdm.srv.listen(a)
  43 if len(args) < 1:
  44     usage(sys.stderr)
  45     sys.exit(1)
  46 if setlog:
  47     logging.basicConfig(format="scgi-wsgi(%(name)s): %(levelname)s: %(message)s")
  48
  49 if sk is None:
  50     # This is suboptimal, since the socket on stdin is not necessarily
  51     # AF_UNIX, but Python does not seem to offer any way around it,
  52     # that I can find.
  53     sk = socket.fromfd(0, socket.AF_UNIX, socket.SOCK_STREAM)
  54
  55 try:
  56     handlermod = __import__(args[0], fromlist = ["dummy"])
  57 except ImportError, exc:
  58     sys.stderr.write("scgi-wsgi: handler %s not found: %s\n" % (args[0], exc.message))
  59     sys.exit(1)
  60 if not modwsgi_compat:
  61     if not hasattr(handlermod, "wmain"):
  62         sys.stderr.write("scgi-wsgi: handler %s has no `wmain' function\n" % args[0])
  63         sys.exit(1)
  64     handler = handlermod.wmain(*args[1:])
  65 else:
  66     if not hasattr(handlermod, "application"):
  67         sys.stderr.write("scgi-wsgi: handler %s has no `application' object\n" % args[0])
  68         sys.exit(1)
  69     handler = handlermod.application
  70
  71 def mkenv(head, sk):
  72     env = dict(head)
  73     env["wsgi.version"] = 1, 0
  74     if "HTTP_X_ASH_PROTOCOL" in env:
  75         env["wsgi.url_scheme"] = env["HTTP_X_ASH_PROTOCOL"]
  76     elif "HTTPS" in env:
  77         env["wsgi.url_scheme"] = "https"
  78     else:
  79         env["wsgi.url_scheme"] = "http"
  80     env["wsgi.input"] = sk
  81     env["wsgi.errors"] = sys.stderr
  82     env["wsgi.multithread"] = True
  83     env["wsgi.multiprocess"] = False
  84     env["wsgi.run_once"] = False
  85     return env
  86
  87 class reqthread(ashd.serve.wsgithread):
  88     def __init__(self, sk):
  89         super(reqthread, self).__init__()
  90         self.bsk = sk.dup()
  91         self.sk = self.bsk.makefile("r+")
  92
  93     def handlewsgi(self):
  94         return handler(self.env, self.startreq)
  95
  96     def writehead(self, status, headers):
  97         try:
  98             self.sk.write("Status: %s\n" % status)
  99             for nm, val in headers:
 100                 self.sk.write("%s: %s\n" % (nm, val))
 101             self.sk.write("\n")
 102         except IOError:
 103             raise ashd.serve.closed()
 104
 105     def writedata(self, data):
 106         try:
 107             self.sk.write(data)
 108             self.sk.flush()
 109         except IOError:
 110             raise ashd.serve.closed()
 111
 112     def handle(self):
 113         head = ashd.scgi.readhead(self.sk)
 114         self.env = mkenv(head, self.sk)
 115         reqevent = ashd.perf.request(self.env)
 116         exc = (None, None, None)
 117         try:
 118             super(reqthread, self).handle()
 119             if self.status:
 120                 reqevent.response([self.status, self.headers])
 121         except:
 122             exc = sys.exc_info()
 123             raise
 124         finally:
 125             reqevent.__exit__(*exc)
 126
 127     def run(self):
 128         try:
 129             super(reqthread, self).run()
 130         finally:
 131             self.sk.close()
 132             self.bsk.close()
 133
 134 while True:
 135     nsk, addr = sk.accept()
 136     try:
 137         reqthread(nsk).start()
 138     finally:
 139         nsk.close()