--- /dev/null
+import sys, collections
+import threading
+
+class protoerr(Exception):
+ pass
+
+class closed(IOError):
+ def __init__(self):
+ super(closed, self).__init__("The client has closed the connection.")
+
+def readns(sk):
+ hln = 0
+ while True:
+ c = sk.read(1)
+ if c == b':':
+ break
+ elif c >= b'0' or c <= b'9':
+ hln = (hln * 10) + (ord(c) - ord(b'0'))
+ else:
+ raise protoerr("Invalid netstring length byte: " + c)
+ ret = sk.read(hln)
+ if sk.read(1) != b',':
+ raise protoerr("Non-terminated netstring")
+ return ret
+
+def readhead(sk):
+ parts = readns(sk).split(b'\0')[:-1]
+ if len(parts) % 2 != 0:
+ raise protoerr("Malformed headers")
+ ret = {}
+ i = 0
+ while i < len(parts):
+ ret[parts[i]] = parts[i + 1]
+ i += 2
+ return ret
+
+class reqthread(threading.Thread):
+ def __init__(self, sk, handler):
+ super(reqthread, self).__init__(name = "SCGI request handler")
+ self.sk = sk.dup().makefile("rwb")
+ self.handler = handler
+
+ def run(self):
+ try:
+ head = readhead(self.sk)
+ self.handler(head, self.sk)
+ finally:
+ self.sk.close()
+
+def handlescgi(sk, handler):
+ t = reqthread(sk, handler)
+ t.start()
+
+def servescgi(socket, handler):
+ while True:
+ nsk, addr = socket.accept()
+ try:
+ handlescgi(nsk, handler)
+ finally:
+ nsk.close()
+
+def decodehead(head, coding):
+ return {k.decode(coding): v.decode(coding) for k, v in head.items()}
+
+def wrapwsgi(handler):
+ def handle(head, sk):
+ try:
+ env = decodehead(head, "utf-8")
+ env["wsgi.uri_encoding"] = "utf-8"
+ except UnicodeError:
+ env = decodehead(head, "latin-1")
+ env["wsgi.uri_encoding"] = "latin-1"
+ env["wsgi.version"] = 1, 0
+ if "HTTP_X_ASH_PROTOCOL" in env:
+ env["wsgi.url_scheme"] = env["HTTP_X_ASH_PROTOCOL"]
+ elif "HTTPS" in env:
+ env["wsgi.url_scheme"] = "https"
+ else:
+ env["wsgi.url_scheme"] = "http"
+ env["wsgi.input"] = sk
+ env["wsgi.errors"] = sys.stderr
+ env["wsgi.multithread"] = True
+ env["wsgi.multiprocess"] = False
+ env["wsgi.run_once"] = False
+
+ resp = []
+ respsent = []
+
+ def recode(thing):
+ if isinstance(thing, collections.ByteString):
+ return thing
+ else:
+ return str(thing).encode("latin-1")
+
+ def flushreq():
+ if not respsent:
+ if not resp:
+ raise Exception("Trying to write data before starting response.")
+ status, headers = resp
+ respsent[:] = [True]
+ buf = bytearray()
+ buf += b"Status: " + recode(status) + b"\n"
+ for nm, val in headers:
+ buf += recode(nm) + b": " + recode(val) + b"\n"
+ buf += b"\n"
+ try:
+ sk.write(buf)
+ except IOError:
+ raise closed()
+
+ def write(data):
+ if not data:
+ return
+ flushreq()
+ try:
+ sk.write(data)
+ sk.flush()
+ except IOError:
+ raise closed()
+
+ def startreq(status, headers, exc_info = None):
+ if resp:
+ if exc_info: # Interesting, this...
+ try:
+ if respsent:
+ raise exc_info[1]
+ finally:
+ exc_info = None # CPython GC bug?
+ else:
+ raise Exception("Can only start responding once.")
+ resp[:] = status, headers
+ return write
+
+ respiter = handler(env, startreq)
+ try:
+ try:
+ for data in respiter:
+ write(data)
+ if resp:
+ flushreq()
+ except closed:
+ pass
+ finally:
+ if hasattr(respiter, "close"):
+ respiter.close()
+ return handle