python3/ashd-wsgi3

   1 #!/usr/bin/python3
   2
   3 import sys, os, getopt, threading, logging, time, locale, collections
   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-wsgi3 [-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:], "+hALp: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-wsgi3(%(name)s): %(levelname)s: %(message)s")
  37 log = logging.getLogger("ashd-wsgi3")
  38
  39 try:
  40     handlermod = __import__(args[0], fromlist = ["dummy"])
  41 except ImportError as exc:
  42     sys.stderr.write("ashd-wsgi3: handler %s not found: %s\n" % (args[0], exc.args[0]))
  43     sys.exit(1)
  44 if not modwsgi_compat:
  45     if not hasattr(handlermod, "wmain"):
  46         sys.stderr.write("ashd-wsgi3: 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-wsgi3: 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 = bytearray()
  63     i = 0
  64     while i < len(url):
  65         c = url[i]
  66         i += 1
  67         if c == ord(b'%'):
  68             if len(url) >= i + 2:
  69                 c = 0
  70                 if ord(b'0') <= url[i] <= ord(b'9'):
  71                     c |= (url[i] - ord(b'0')) << 4
  72                 elif ord(b'a') <= url[i] <= ord(b'f'):
  73                     c |= (url[i] - ord(b'a') + 10) << 4
  74                 elif ord(b'A') <= url[i] <= ord(b'F'):
  75                     c |= (url[i] - ord(b'A') + 10) << 4
  76                 else:
  77                     raise ValueError("Illegal URL escape character")
  78                 if ord(b'0') <= url[i + 1] <= ord(b'9'):
  79                     c |= url[i + 1] - ord('0')
  80                 elif ord(b'a') <= url[i + 1] <= ord(b'f'):
  81                     c |= url[i + 1] - ord(b'a') + 10
  82                 elif ord(b'A') <= url[i + 1] <= ord(b'F'):
  83                     c |= url[i + 1] - ord(b'A') + 10
  84                 else:
  85                     raise ValueError("Illegal URL escape character")
  86                 buf.append(c)
  87                 i += 2
  88             else:
  89                 raise ValueError("Incomplete URL escape character")
  90         else:
  91             buf.append(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(b"-", b"_").decode("latin-1")] = val.decode("latin-1")
  99     env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
 100     env["GATEWAY_INTERFACE"] = "CGI/1.1"
 101     env["SERVER_PROTOCOL"] = req.ver.decode("latin-1")
 102     env["REQUEST_METHOD"] = req.method.decode("latin-1")
 103     try:
 104         rawpi = unquoteurl(req.rest)
 105     except:
 106         rawpi = req.rest
 107     try:
 108         name, rest, pi = (v.decode("utf-8") for v in (req.url, req.rest, rawpi))
 109         env["wsgi.uri_encoding"] = "utf-8"
 110     except UnicodeError as exc:
 111         name, rest, pi = (v.decode("latin-1") for v in (req.url, req.rest, rawpi))
 112         env["wsgi.uri_encoding"] = "latin-1"
 113     env["REQUEST_URI"] = name
 114     p = name.find('?')
 115     if p >= 0:
 116         env["QUERY_STRING"] = name[p + 1:]
 117         name = name[:p]
 118     else:
 119         env["QUERY_STRING"] = ""
 120     if name[-len(rest):] == rest:
 121         # This is the same hack used in call*cgi.
 122         name = name[:-len(rest)]
 123     if name == "/":
 124         # This seems to be normal CGI behavior, but see callcgi.c for
 125         # details.
 126         pi = "/" + pi
 127         name = ""
 128     env["SCRIPT_NAME"] = name
 129     env["PATH_INFO"] = pi
 130     for src, tgt in [("HTTP_HOST", "SERVER_NAME"), ("HTTP_X_ASH_PROTOCOL", "wsgi.url_scheme"),
 131                      ("HTTP_X_ASH_SERVER_ADDRESS", "SERVER_ADDR"), ("HTTP_X_ASH_SERVER_PORT", "SERVER_PORT"),
 132                      ("HTTP_X_ASH_ADDRESS", "REMOTE_ADDR"), ("HTTP_X_ASH_PORT", "REMOTE_PORT"),
 133                      ("HTTP_CONTENT_TYPE", "CONTENT_TYPE"), ("HTTP_CONTENT_LENGTH", "CONTENT_LENGTH")]:
 134         if src in env: env[tgt] = env[src]
 135     for key in ["HTTP_CONTENT_TYPE", "HTTP_CONTENT_LENGTH"]:
 136         # The CGI specification does not strictly require this, but
 137         # many actualy programs and libraries seem to.
 138         if key in env: del env[key]
 139     if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == b"https": env["HTTPS"] = "on"
 140     if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"].decode(locale.getpreferredencoding()))
 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.calllimiter(reqlimit).call
 150 else:
 151     guard = lambda fun: fun()
 152
 153 def recode(thing):
 154     if isinstance(thing, collections.ByteString):
 155         return thing
 156     else:
 157         return str(thing).encode("latin-1")
 158
 159 class reqthread(ashd.serve.wsgithread):
 160     def __init__(self, req):
 161         super().__init__(name = "Request handler")
 162         self.req = req.dup()
 163
 164     def handlewsgi(self):
 165         return handler(self.env, self.startreq)
 166
 167     def writehead(self, status, headers):
 168         buf = bytearray()
 169         buf += b"HTTP/1.1 " + recode(status) + b"\n"
 170         for nm, val in headers:
 171             buf += recode(nm) + b": " + recode(val) + b"\n"
 172         buf += b"\n"
 173         try:
 174             self.req.sk.write(buf)
 175         except IOError:
 176             raise ashd.serve.closed()
 177
 178     def writedata(self, data):
 179         try:
 180             self.req.sk.write(data)
 181             self.req.sk.flush()
 182         except IOError:
 183             raise ashd.serve.closed()
 184
 185     def handle(self):
 186         self.env = mkenv(self.req)
 187         with ashd.perf.request(self.env) as reqevent:
 188             super().handle()
 189             if self.status:
 190                 reqevent.response([self.status, self.headers])
 191
 192     def run(self):
 193         try:
 194             guard(super().run)
 195         finally:
 196             self.req.close()
 197             sys.stderr.flush()
 198
 199 def handle(req):
 200     reqthread(req).start()
 201
 202 ashd.util.serveloop(handle)