python3/ashd-wsgi3

   1 #!/usr/bin/python3
   2
   3 import sys, os, getopt, socket, logging, time, locale, collections.abc, signal
   4 import ashd.util, ashd.serve, ashd.htlib
   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] [-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-wsgi3(%(name)s): %(levelname)s: %(message)s")
  39 log = logging.getLogger("ashd-wsgi3")
  40
  41 try:
  42     handlermod = __import__(args[0], fromlist = ["dummy"])
  43 except ImportError as exc:
  44     sys.stderr.write("ashd-wsgi3: handler %s not found: %s\n" % (args[0], exc.args[0]))
  45     sys.exit(1)
  46 if not modwsgi_compat:
  47     if not hasattr(handlermod, "wmain"):
  48         sys.stderr.write("ashd-wsgi3: 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-wsgi3: 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 = bytearray()
  65     i = 0
  66     while i < len(url):
  67         c = url[i]
  68         i += 1
  69         if c == ord(b'%'):
  70             if len(url) >= i + 2:
  71                 c = 0
  72                 if ord(b'0') <= url[i] <= ord(b'9'):
  73                     c |= (url[i] - ord(b'0')) << 4
  74                 elif ord(b'a') <= url[i] <= ord(b'f'):
  75                     c |= (url[i] - ord(b'a') + 10) << 4
  76                 elif ord(b'A') <= url[i] <= ord(b'F'):
  77                     c |= (url[i] - ord(b'A') + 10) << 4
  78                 else:
  79                     raise ValueError("Illegal URL escape character")
  80                 if ord(b'0') <= url[i + 1] <= ord(b'9'):
  81                     c |= url[i + 1] - ord('0')
  82                 elif ord(b'a') <= url[i + 1] <= ord(b'f'):
  83                     c |= url[i + 1] - ord(b'a') + 10
  84                 elif ord(b'A') <= url[i + 1] <= ord(b'F'):
  85                     c |= url[i + 1] - ord(b'A') + 10
  86                 else:
  87                     raise ValueError("Illegal URL escape character")
  88                 buf.append(c)
  89                 i += 2
  90             else:
  91                 raise ValueError("Incomplete URL escape character")
  92         else:
  93             buf.append(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(b"-", b"_").decode("latin-1")] = val.decode("latin-1")
 101     env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
 102     env["GATEWAY_INTERFACE"] = "CGI/1.1"
 103     env["SERVER_PROTOCOL"] = req.ver.decode("latin-1")
 104     env["REQUEST_METHOD"] = req.method.decode("latin-1")
 105     try:
 106         rawpi = unquoteurl(req.rest)
 107     except:
 108         rawpi = req.rest
 109     try:
 110         name, rest, pi = (v.decode("utf-8") for v in (req.url, req.rest, rawpi))
 111         env["wsgi.uri_encoding"] = "utf-8"
 112     except UnicodeError as exc:
 113         name, rest, pi = (v.decode("latin-1") for v in (req.url, req.rest, rawpi))
 114         env["wsgi.uri_encoding"] = "latin-1"
 115     env["REQUEST_URI"] = name
 116     p = name.find('?')
 117     if p >= 0:
 118         env["QUERY_STRING"] = name[p + 1:]
 119         name = name[:p]
 120     else:
 121         env["QUERY_STRING"] = ""
 122     if name[-len(rest):] == rest:
 123         # This is the same hack used in call*cgi.
 124         name = name[:-len(rest)]
 125     if name == "/":
 126         # This seems to be normal CGI behavior, but see callcgi.c for
 127         # details.
 128         pi = "/" + pi
 129         name = ""
 130     env["SCRIPT_NAME"] = name
 131     env["PATH_INFO"] = pi
 132     for src, tgt in [("HTTP_HOST", "SERVER_NAME"), ("HTTP_X_ASH_PROTOCOL", "wsgi.url_scheme"),
 133                      ("HTTP_X_ASH_SERVER_ADDRESS", "SERVER_ADDR"), ("HTTP_X_ASH_SERVER_PORT", "SERVER_PORT"),
 134                      ("HTTP_X_ASH_ADDRESS", "REMOTE_ADDR"), ("HTTP_X_ASH_PORT", "REMOTE_PORT"),
 135                      ("HTTP_CONTENT_TYPE", "CONTENT_TYPE"), ("HTTP_CONTENT_LENGTH", "CONTENT_LENGTH")]:
 136         if src in env: env[tgt] = env[src]
 137     for key in ["HTTP_CONTENT_TYPE", "HTTP_CONTENT_LENGTH"]:
 138         # The CGI specification does not strictly require this, but
 139         # many actualy programs and libraries seem to.
 140         if key in env: del env[key]
 141     if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == b"https": env["HTTPS"] = "on"
 142     if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"].decode(locale.getpreferredencoding()))
 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 def recode(thing):
 151     if isinstance(thing, collections.abc.ByteString):
 152         return thing
 153     else:
 154         return str(thing).encode("latin-1")
 155
 156 class request(ashd.serve.wsgirequest):
 157     def __init__(self, *, bkreq, **kw):
 158         super().__init__(**kw)
 159         self.bkreq = bkreq.dup()
 160         self.sendrights = None
 161
 162     def mkenv(self):
 163         return mkenv(self.bkreq)
 164
 165     def handlewsgi(self, env, startreq):
 166         return handler(env, startreq)
 167
 168     def fileno(self):
 169         return self.bkreq.bsk.fileno()
 170
 171     def writehead(self, status, headers):
 172         headers = list(headers)
 173         for header in headers:
 174             nm, val = header
 175             if nm.lower() == "x-ash-send-rights":
 176                 self.sendrights = val
 177                 headers.remove(header)
 178                 break
 179         w = self.buffer.extend
 180         w(b"HTTP/1.1 " + recode(status) + b"\n")
 181         for nm, val in headers:
 182             w(recode(nm) + b": " + recode(val) + b"\n")
 183         w(b"\n")
 184
 185     def flush(self):
 186         try:
 187             if self.sendrights is not None:
 188                 ret = ashd.htlib.sendfd(self.bkreq.bsk.fileno(), self.sendrights.fileno(), self.buffer)
 189                 self.sendrights.close()
 190                 self.sendrights = None
 191             else:
 192                 ret = self.bkreq.bsk.send(self.buffer, socket.MSG_DONTWAIT)
 193             self.buffer[:ret] = b""
 194         except IOError:
 195             raise ashd.serve.closed()
 196
 197     def close(self):
 198         try:
 199             self.bkreq.close()
 200         finally:
 201             if self.sendrights is not None:
 202                 self.sendrights.close()
 203
 204 def handle(req):
 205     reqhandler.handle(request(bkreq=req, handler=reqhandler))
 206
 207 if hspec[0] not in ashd.serve.names:
 208     sys.stderr.write("ashd-wsgi3: no such request handler: %s\n" % hspec[0])
 209     sys.exit(1)
 210 hclass = ashd.serve.names[hspec[0]]
 211 try:
 212     hargs = hclass.parseargs(**hspec[1])
 213 except ValueError as exc:
 214     sys.stderr.write("ashd-wsgi3: %s\n" % exc)
 215     sys.exit(1)
 216
 217 def sigterm(sig, frame):
 218     socket.fromfd(0, socket.AF_UNIX, socket.SOCK_SEQPACKET).shutdown(socket.SHUT_RDWR) # :P
 219 for signum in [signal.SIGINT, signal.SIGTERM]:
 220     signal.signal(signum, sigterm)
 221
 222 reqhandler = hclass(**hargs)
 223 try:
 224     ashd.util.serveloop(handle)
 225 finally:
 226     reqhandler.close()