[ashd.git] / python / ashd-wsgi

#!/usr/bin/python

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

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

reqlimit = 0
modwsgi_compat = False
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 == "-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)

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:
        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()
        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()
        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, 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 [-hA] [-m PDM-SPEC] [-p MODPATH] [-l REQLIMIT] HANDLER-MODULE [ARGS...]\n")
	12
	13	reqlimit = 0
	14	modwsgi_compat = False
	15	opts, args = getopt.getopt(sys.argv[1:], "+hAp:l:m:")
	16	for o, a in opts:
	17	if o == "-h":
	18	usage(sys.stdout)
	19	sys.exit(0)
	20	elif o == "-p":
	21	sys.path.insert(0, a)
	22	elif o == "-A":
	23	modwsgi_compat = True
	24	elif o == "-l":
	25	reqlimit = int(a)
	26	elif o == "-m":
	27	if pdm is not None:
	28	pdm.srv.listen(a)
	29	if len(args) < 1:
	30	usage(sys.stderr)
	31	sys.exit(1)
	32
	33	try:
	34	handlermod = __import__(args[0], fromlist = ["dummy"])
	35	except ImportError, exc:
	36	sys.stderr.write("ashd-wsgi: handler %s not found: %s\n" % (args[0], exc.message))
	37	sys.exit(1)
	38	if not modwsgi_compat:
	39	if not hasattr(handlermod, "wmain"):
	40	sys.stderr.write("ashd-wsgi: handler %s has no `wmain' function\n" % args[0])
	41	sys.exit(1)
	42	handler = handlermod.wmain(*args[1:])
	43	else:
	44	if not hasattr(handlermod, "application"):
	45	sys.stderr.write("ashd-wsgi: handler %s has no `application' object\n" % args[0])
	46	sys.exit(1)
	47	handler = handlermod.application
	48
	49	class closed(IOError):
	50	def __init__(self):
	51	super(closed, self).__init__("The client has closed the connection.")
	52
	53	cwd = os.getcwd()
	54	def absolutify(path):
	55	if path[0] != '/':
	56	return os.path.join(cwd, path)
	57	return path
	58
	59	def unquoteurl(url):
	60	buf = ""
	61	i = 0
	62	while i < len(url):
	63	c = url[i]
	64	i += 1
	65	if c == '%':
	66	if len(url) >= i + 2:
	67	c = 0
	68	if '0' <= url[i] <= '9':
	69	c \|= (ord(url[i]) - ord('0')) << 4
	70	elif 'a' <= url[i] <= 'f':
	71	c \|= (ord(url[i]) - ord('a') + 10) << 4
	72	elif 'A' <= url[i] <= 'F':
	73	c \|= (ord(url[i]) - ord('A') + 10) << 4
	74	else:
	75	raise ValueError("Illegal URL escape character")
	76	if '0' <= url[i + 1] <= '9':
	77	c \|= ord(url[i + 1]) - ord('0')
	78	elif 'a' <= url[i + 1] <= 'f':
	79	c \|= ord(url[i + 1]) - ord('a') + 10
	80	elif 'A' <= url[i + 1] <= 'F':
	81	c \|= ord(url[i + 1]) - ord('A') + 10
	82	else:
	83	raise ValueError("Illegal URL escape character")
	84	buf += chr(c)
	85	i += 2
	86	else:
	87	raise ValueError("Incomplete URL escape character")
	88	else:
	89	buf += c
	90	return buf
	91
	92	def dowsgi(req):
	93	env = {}
	94	env["wsgi.version"] = 1, 0
	95	for key, val in req.headers:
	96	env["HTTP_" + key.upper().replace("-", "_")] = val
	97	env["SERVER_SOFTWARE"] = "ashd-wsgi/1"
	98	env["GATEWAY_INTERFACE"] = "CGI/1.1"
	99	env["SERVER_PROTOCOL"] = req.ver
	100	env["REQUEST_METHOD"] = req.method
	101	env["REQUEST_URI"] = req.url
	102	name = req.url
	103	p = name.find('?')
	104	if p >= 0:
	105	env["QUERY_STRING"] = name[p + 1:]
	106	name = name[:p]
	107	else:
	108	env["QUERY_STRING"] = ""
	109	if name[-len(req.rest):] == req.rest:
	110	# This is the same hack used in call*cgi.
	111	name = name[:-len(req.rest)]
	112	try:
	113	pi = unquoteurl(req.rest)
	114	except:
	115	pi = req.rest
	116	if name == '/':
	117	# This seems to be normal CGI behavior, but see callcgi.c for
	118	# details.
	119	pi = "/" + pi
	120	name = ""
	121	env["SCRIPT_NAME"] = name
	122	env["PATH_INFO"] = pi
	123	if "Host" in req: env["SERVER_NAME"] = req["Host"]
	124	if "X-Ash-Server-Port" in req: env["SERVER_PORT"] = req["X-Ash-Server-Port"]
	125	if "X-Ash-Protocol" in req and req["X-Ash-Protocol"] == "https": env["HTTPS"] = "on"
	126	if "X-Ash-Address" in req: env["REMOTE_ADDR"] = req["X-Ash-Address"]
	127	if "Content-Type" in req: env["CONTENT_TYPE"] = req["Content-Type"]
	128	if "Content-Length" in req: env["CONTENT_LENGTH"] = req["Content-Length"]
	129	if "X-Ash-File" in req: env["SCRIPT_FILENAME"] = absolutify(req["X-Ash-File"])
	130	if "X-Ash-Protocol" in req: env["wsgi.url_scheme"] = req["X-Ash-Protocol"]
	131	env["wsgi.input"] = req.sk
	132	env["wsgi.errors"] = sys.stderr
	133	env["wsgi.multithread"] = True
	134	env["wsgi.multiprocess"] = False
	135	env["wsgi.run_once"] = False
	136
	137	resp = []
	138	respsent = []
	139
	140	def flushreq():
	141	if not respsent:
	142	if not resp:
	143	raise Exception, "Trying to write data before starting response."
	144	status, headers = resp
	145	respsent[:] = [True]
	146	try:
	147	req.sk.write("HTTP/1.1 %s\n" % status)
	148	for nm, val in headers:
	149	req.sk.write("%s: %s\n" % (nm, val))
	150	req.sk.write("\n")
	151	except IOError:
	152	raise closed()
	153
	154	def write(data):
	155	if not data:
	156	return
	157	flushreq()
	158	try:
	159	req.sk.write(data)
	160	req.sk.flush()
	161	except IOError:
	162	raise closed()
	163
	164	def startreq(status, headers, exc_info = None):
	165	if resp:
	166	if exc_info: # Interesting, this...
	167	try:
	168	if respsent:
	169	raise exc_info[0], exc_info[1], exc_info[2]
	170	finally:
	171	exc_info = None # CPython GC bug?
	172	else:
	173	raise Exception, "Can only start responding once."
	174	resp[:] = status, headers
	175	return write
	176
	177	reqevent = ashd.perf.request(env)
	178	exc = (None, None, None)
	179	try:
	180	respiter = handler(env, startreq)
	181	try:
	182	try:
	183	for data in respiter:
	184	write(data)
	185	if resp:
	186	flushreq()
	187	except closed:
	188	pass
	189	finally:
	190	if hasattr(respiter, "close"):
	191	respiter.close()
	192	if resp:
	193	reqevent.response(resp)
	194	except:
	195	exc = sys.exc_info()
	196	raise
	197	finally:
	198	reqevent.__exit__(*exc)
	199
	200	flightlock = threading.Condition()
	201	inflight = 0
	202
	203	class reqthread(threading.Thread):
	204	def __init__(self, req):
	205	super(reqthread, self).__init__(name = "Request handler")
	206	self.req = req.dup()
	207
	208	def run(self):
	209	global inflight
	210	try:
	211	flightlock.acquire()
	212	try:
	213	if reqlimit != 0:
	214	start = time.time()
	215	while inflight >= reqlimit:
	216	flightlock.wait(10)
	217	if time.time() - start > 10:
	218	os.abort()
	219	inflight += 1
	220	finally:
	221	flightlock.release()
	222	try:
	223	dowsgi(self.req)
	224	finally:
	225	flightlock.acquire()
	226	try:
	227	inflight -= 1
	228	flightlock.notify()
	229	finally:
	230	flightlock.release()
	231	finally:
	232	self.req.close()
	233
	234	def handle(req):
	235	reqthread(req).start()
	236
	237	ashd.util.serveloop(handle)