python/ashd-wsgi

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