[ashd.git] / python / ashd-wsgi

#!/usr/bin/python

import sys, os, getopt, threading, logging, time
import ashd.proto, ashd.util, ashd.perf
try:
    import pdm.srv
except:
    pdm = None

def usage(out):
    out.write("usage: ashd-wsgi [-hAL] [-m PDM-SPEC] [-p MODPATH] [-l REQLIMIT] HANDLER-MODULE [ARGS...]\n")

reqlimit = 0
modwsgi_compat = False
setlog = True
opts, args = getopt.getopt(sys.argv[1:], "+hAp:l:m:")
for o, a in opts:
    if o == "-h":
        usage(sys.stdout)
        sys.exit(0)
    elif o == "-p":
        sys.path.insert(0, a)
    elif o == "-L":
        setlog = False
    elif o == "-A":
        modwsgi_compat = True
    elif o == "-l":
        reqlimit = int(a)
    elif o == "-m":
        if pdm is not None:
            pdm.srv.listen(a)
if len(args) < 1:
    usage(sys.stderr)
    sys.exit(1)
if setlog:
    logging.basicConfig(format="ashd-wsgi(%(name)s): %(levelname)s: %(message)s")
log = logging.getLogger("ashd-wsgi")

try:
    handlermod = __import__(args[0], fromlist = ["dummy"])
except ImportError, exc:
    sys.stderr.write("ashd-wsgi: handler %s not found: %s\n" % (args[0], exc.message))
    sys.exit(1)
if not modwsgi_compat:
    if not hasattr(handlermod, "wmain"):
        sys.stderr.write("ashd-wsgi: handler %s has no `wmain' function\n" % args[0])
        sys.exit(1)
    handler = handlermod.wmain(*args[1:])
else:
    if not hasattr(handlermod, "application"):
        sys.stderr.write("ashd-wsgi: handler %s has no `application' object\n" % args[0])
        sys.exit(1)
    handler = handlermod.application

class closed(IOError):
    def __init__(self):
        super(closed, self).__init__("The client has closed the connection.")

cwd = os.getcwd()
def absolutify(path):
    if path[0] != '/':
        return os.path.join(cwd, path)
    return path

def unquoteurl(url):
    buf = ""
    i = 0
    while i < len(url):
        c = url[i]
        i += 1
        if c == '%':
            if len(url) >= i + 2:
                c = 0
                if '0' <= url[i] <= '9':
                    c |= (ord(url[i]) - ord('0')) << 4
                elif 'a' <= url[i] <= 'f':
                    c |= (ord(url[i]) - ord('a') + 10) << 4
                elif 'A' <= url[i] <= 'F':
                    c |= (ord(url[i]) - ord('A') + 10) << 4
                else:
                    raise ValueError("Illegal URL escape character")
                if '0' <= url[i + 1] <= '9':
                    c |= ord(url[i + 1]) - ord('0')
                elif 'a' <= url[i + 1] <= 'f':
                    c |= ord(url[i + 1]) - ord('a') + 10
                elif 'A' <= url[i + 1] <= 'F':
                    c |= ord(url[i + 1]) - ord('A') + 10
                else:
                    raise ValueError("Illegal URL escape character")
                buf += chr(c)
                i += 2
            else:
                raise ValueError("Incomplete URL escape character")
        else:
            buf += c
    return buf

def dowsgi(req):
    env = {}
    env["wsgi.version"] = 1, 0
    for key, val in req.headers:
        env["HTTP_" + key.upper().replace("-", "_")] = val
    env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
    env["GATEWAY_INTERFACE"] = "CGI/1.1"
    env["SERVER_PROTOCOL"] = req.ver
    env["REQUEST_METHOD"] = req.method
    env["REQUEST_URI"] = req.url
    name = req.url
    p = name.find('?')
    if p >= 0:
        env["QUERY_STRING"] = name[p + 1:]
        name = name[:p]
    else:
        env["QUERY_STRING"] = ""
    if name[-len(req.rest):] == req.rest:
        # This is the same hack used in call*cgi.
        name = name[:-len(req.rest)]
    try:
        pi = unquoteurl(req.rest)
    except:
        pi = req.rest
    if name == '/':
        # This seems to be normal CGI behavior, but see callcgi.c for
        # details.
        pi = "/" + pi
        name = ""
    env["SCRIPT_NAME"] = name
    env["PATH_INFO"] = pi
    if "Host" in req: env["SERVER_NAME"] = req["Host"]
    if "X-Ash-Server-Port" in req: env["SERVER_PORT"] = req["X-Ash-Server-Port"]
    if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == "https": env["HTTPS"] = "on"
    if "X-Ash-Address" in req: env["REMOTE_ADDR"] = req["X-Ash-Address"]
    if "Content-Type" in req: env["CONTENT_TYPE"] = req["Content-Type"]
    if "Content-Length" in req: env["CONTENT_LENGTH"] = req["Content-Length"]
    if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"])
    if "X-Ash-Protocol" in req: env["wsgi.url_scheme"] = req["X-Ash-Protocol"]
    env["wsgi.input"] = req.sk
    env["wsgi.errors"] = sys.stderr
    env["wsgi.multithread"] = True
    env["wsgi.multiprocess"] = False
    env["wsgi.run_once"] = False

    resp = []
    respsent = []

    def flushreq():
        if not respsent:
            if not resp:
                raise Exception, "Trying to write data before starting response."
            status, headers = resp
            respsent[:] = [True]
            try:
                req.sk.write("HTTP/1.1 %s\n" % status)
                for nm, val in headers:
                    req.sk.write("%s: %s\n" % (nm, val))
                req.sk.write("\n")
            except IOError:
                raise closed()

    def write(data):
        if not data:
            return
        flushreq()
        try:
            req.sk.write(data)
            req.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[0], exc_info[1], exc_info[2]
                finally:
                    exc_info = None     # CPython GC bug?
            else:
                raise Exception, "Can only start responding once."
        resp[:] = status, headers
        return write

    reqevent = ashd.perf.request(env)
    exc = (None, None, None)
    try:
        try:
            respiter = handler(env, startreq)
            try:
                for data in respiter:
                    write(data)
                if resp:
                    flushreq()
            finally:
                if hasattr(respiter, "close"):
                    respiter.close()
        except closed:
            pass
        if resp:
            reqevent.response(resp)
    except:
        exc = sys.exc_info()
        raise
    finally:
        reqevent.__exit__(*exc)

flightlock = threading.Condition()
inflight = 0

class reqthread(threading.Thread):
    def __init__(self, req):
        super(reqthread, self).__init__(name = "Request handler")
        self.req = req.dup()
    
    def run(self):
        global inflight
        try:
            flightlock.acquire()
            try:
                if reqlimit != 0:
                    start = time.time()
                    while inflight >= reqlimit:
                        flightlock.wait(10)
                        if time.time() - start > 10:
                            os.abort()
                inflight += 1
            finally:
                flightlock.release()
            try:
                dowsgi(self.req)
            finally:
                flightlock.acquire()
                try:
                    inflight -= 1
                    flightlock.notify()
                finally:
                    flightlock.release()
        except:
            log.error("exception occurred in handler thread", exc_info=True)
        finally:
            self.req.close()
    
def handle(req):
    reqthread(req).start()

ashd.util.serveloop(handle)
Commit	Line	Data
	1	#!/usr/bin/python
	2
	3	import sys, os, getopt, threading, logging, time
	4	import ashd.proto, ashd.util, ashd.perf
	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	class closed(IOError):
	56	def __init__(self):
	57	super(closed, self).__init__("The client has closed the connection.")
	58
	59	cwd = os.getcwd()
	60	def absolutify(path):
	61	if path[0] != '/':
	62	return os.path.join(cwd, path)
	63	return path
	64
	65	def unquoteurl(url):
	66	buf = ""
	67	i = 0
	68	while i < len(url):
	69	c = url[i]
	70	i += 1
	71	if c == '%':
	72	if len(url) >= i + 2:
	73	c = 0
	74	if '0' <= url[i] <= '9':
	75	c \|= (ord(url[i]) - ord('0')) << 4
	76	elif 'a' <= url[i] <= 'f':
	77	c \|= (ord(url[i]) - ord('a') + 10) << 4
	78	elif 'A' <= url[i] <= 'F':
	79	c \|= (ord(url[i]) - ord('A') + 10) << 4
	80	else:
	81	raise ValueError("Illegal URL escape character")
	82	if '0' <= url[i + 1] <= '9':
	83	c \|= ord(url[i + 1]) - ord('0')
	84	elif 'a' <= url[i + 1] <= 'f':
	85	c \|= ord(url[i + 1]) - ord('a') + 10
	86	elif 'A' <= url[i + 1] <= 'F':
	87	c \|= ord(url[i + 1]) - ord('A') + 10
	88	else:
	89	raise ValueError("Illegal URL escape character")
	90	buf += chr(c)
	91	i += 2
	92	else:
	93	raise ValueError("Incomplete URL escape character")
	94	else:
	95	buf += c
	96	return buf
	97
	98	def dowsgi(req):
	99	env = {}
	100	env["wsgi.version"] = 1, 0
	101	for key, val in req.headers:
	102	env["HTTP_" + key.upper().replace("-", "_")] = val
	103	env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
	104	env["GATEWAY_INTERFACE"] = "CGI/1.1"
	105	env["SERVER_PROTOCOL"] = req.ver
	106	env["REQUEST_METHOD"] = req.method
	107	env["REQUEST_URI"] = req.url
	108	name = req.url
	109	p = name.find('?')
	110	if p >= 0:
	111	env["QUERY_STRING"] = name[p + 1:]
	112	name = name[:p]
	113	else:
	114	env["QUERY_STRING"] = ""
	115	if name[-len(req.rest):] == req.rest:
	116	# This is the same hack used in call*cgi.
	117	name = name[:-len(req.rest)]
	118	try:
	119	pi = unquoteurl(req.rest)
	120	except:
	121	pi = req.rest
	122	if name == '/':
	123	# This seems to be normal CGI behavior, but see callcgi.c for
	124	# details.
	125	pi = "/" + pi
	126	name = ""
	127	env["SCRIPT_NAME"] = name
	128	env["PATH_INFO"] = pi
	129	if "Host" in req: env["SERVER_NAME"] = req["Host"]
	130	if "X-Ash-Server-Port" in req: env["SERVER_PORT"] = req["X-Ash-Server-Port"]
	131	if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == "https": env["HTTPS"] = "on"
	132	if "X-Ash-Address" in req: env["REMOTE_ADDR"] = req["X-Ash-Address"]
	133	if "Content-Type" in req: env["CONTENT_TYPE"] = req["Content-Type"]
	134	if "Content-Length" in req: env["CONTENT_LENGTH"] = req["Content-Length"]
	135	if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"])
	136	if "X-Ash-Protocol" in req: env["wsgi.url_scheme"] = req["X-Ash-Protocol"]
	137	env["wsgi.input"] = req.sk
	138	env["wsgi.errors"] = sys.stderr
	139	env["wsgi.multithread"] = True
	140	env["wsgi.multiprocess"] = False
	141	env["wsgi.run_once"] = False
	142
	143	resp = []
	144	respsent = []
	145
	146	def flushreq():
	147	if not respsent:
	148	if not resp:
	149	raise Exception, "Trying to write data before starting response."
	150	status, headers = resp
	151	respsent[:] = [True]
	152	try:
	153	req.sk.write("HTTP/1.1 %s\n" % status)
	154	for nm, val in headers:
	155	req.sk.write("%s: %s\n" % (nm, val))
	156	req.sk.write("\n")
	157	except IOError:
	158	raise closed()
	159
	160	def write(data):
	161	if not data:
	162	return
	163	flushreq()
	164	try:
	165	req.sk.write(data)
	166	req.sk.flush()
	167	except IOError:
	168	raise closed()
	169
	170	def startreq(status, headers, exc_info = None):
	171	if resp:
	172	if exc_info: # Interesting, this...
	173	try:
	174	if respsent:
	175	raise exc_info[0], exc_info[1], exc_info[2]
	176	finally:
	177	exc_info = None # CPython GC bug?
	178	else:
	179	raise Exception, "Can only start responding once."
	180	resp[:] = status, headers
	181	return write
	182
	183	reqevent = ashd.perf.request(env)
	184	exc = (None, None, None)
	185	try:
	186	try:
	187	respiter = handler(env, startreq)
	188	try:
	189	for data in respiter:
	190	write(data)
	191	if resp:
	192	flushreq()
	193	finally:
	194	if hasattr(respiter, "close"):
	195	respiter.close()
	196	except closed:
	197	pass
	198	if resp:
	199	reqevent.response(resp)
	200	except:
	201	exc = sys.exc_info()
	202	raise
	203	finally:
	204	reqevent.__exit__(*exc)
	205
	206	flightlock = threading.Condition()
	207	inflight = 0
	208
	209	class reqthread(threading.Thread):
	210	def __init__(self, req):
	211	super(reqthread, self).__init__(name = "Request handler")
	212	self.req = req.dup()
	213
	214	def run(self):
	215	global inflight
	216	try:
	217	flightlock.acquire()
	218	try:
	219	if reqlimit != 0:
	220	start = time.time()
	221	while inflight >= reqlimit:
	222	flightlock.wait(10)
	223	if time.time() - start > 10:
	224	os.abort()
	225	inflight += 1
	226	finally:
	227	flightlock.release()
	228	try:
	229	dowsgi(self.req)
	230	finally:
	231	flightlock.acquire()
	232	try:
	233	inflight -= 1
	234	flightlock.notify()
	235	finally:
	236	flightlock.release()
	237	except:
	238	log.error("exception occurred in handler thread", exc_info=True)
	239	finally:
	240	self.req.close()
	241
	242	def handle(req):
	243	reqthread(req).start()
	244
	245	ashd.util.serveloop(handle)