python3/scgi-wsgi3

   1 #!/usr/bin/python3
   2
   3 import sys, os, getopt, logging, collections
   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-wsgi3 [-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-wsgi3(%(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 as exc:
  58     sys.stderr.write("scgi-wsgi3: handler %s not found: %s\n" % (args[0], exc.args[0]))
  59     sys.exit(1)
  60 if not modwsgi_compat:
  61     if not hasattr(handlermod, "wmain"):
  62         sys.stderr.write("scgi-wsgi3: 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-wsgi3: handler %s has no `application' object\n" % args[0])
  68         sys.exit(1)
  69     handler = handlermod.application
  70
  71 def mkenv(head, sk):
  72     try:
  73         env = ashd.scgi.decodehead(head, "utf-8")
  74         env["wsgi.uri_encoding"] = "utf-8"
  75     except UnicodeError:
  76         env = ashd.scgi.decodehead(head, "latin-1")
  77         env["wsgi.uri_encoding"] = "latin-1"
  78     env["wsgi.version"] = 1, 0
  79     if "HTTP_X_ASH_PROTOCOL" in env:
  80         env["wsgi.url_scheme"] = env["HTTP_X_ASH_PROTOCOL"]
  81     elif "HTTPS" in env:
  82         env["wsgi.url_scheme"] = "https"
  83     else:
  84         env["wsgi.url_scheme"] = "http"
  85     env["wsgi.input"] = sk
  86     env["wsgi.errors"] = sys.stderr
  87     env["wsgi.multithread"] = True
  88     env["wsgi.multiprocess"] = False
  89     env["wsgi.run_once"] = False
  90     return env
  91
  92 def recode(thing):
  93     if isinstance(thing, collections.ByteString):
  94         return thing
  95     else:
  96         return str(thing).encode("latin-1")
  97
  98 class reqthread(ashd.serve.wsgithread):
  99     def __init__(self, sk):
 100         super().__init__()
 101         self.bsk = sk.dup()
 102         self.sk = self.bsk.makefile("rwb")
 103
 104     def handlewsgi(self):
 105         return handler(self.env, self.startreq)
 106
 107     def writehead(self, status, headers):
 108         buf = bytearray()
 109         buf += b"Status: " + recode(status) + b"\n"
 110         for nm, val in headers:
 111             buf += recode(nm) + b": " + recode(val) + b"\n"
 112         buf += b"\n"
 113         try:
 114             self.sk.write(buf)
 115         except IOError:
 116             raise ashd.serve.closed()
 117
 118     def writedata(self, data):
 119         try:
 120             self.sk.write(data)
 121             self.sk.flush()
 122         except IOError:
 123             raise ashd.serve.closed()
 124
 125     def handle(self):
 126         head = ashd.scgi.readhead(self.sk)
 127         self.env = mkenv(head, self.sk)
 128         with ashd.perf.request(self.env) as reqevent:
 129             super().handle()
 130             if self.status:
 131                 reqevent.response([self.status, self.headers])
 132
 133     def run(self):
 134         try:
 135             super().run()
 136         finally:
 137             self.sk.close()
 138             self.bsk.close()
 139
 140 while True:
 141     nsk, addr = sk.accept()
 142     try:
 143         reqthread(nsk).start()
 144     finally:
 145         nsk.close()