[ashd.git] / python3 / ashd / serve.py

import sys, os, threading, time, logging, select, queue, collections
from . import perf

log = logging.getLogger("ashd.serve")
seq = 1
seqlk = threading.Lock()

def reqseq():
    global seq
    with seqlk:
        s = seq
        seq += 1
        return s

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

class reqthread(threading.Thread):
    def __init__(self, *, name=None, **kw):
        if name is None:
            name = "Request handler %i" % reqseq()
        super().__init__(name=name, **kw)

class wsgirequest(object):
    def __init__(self, *, handler):
        self.status = None
        self.headers = []
        self.respsent = False
        self.handler = handler
        self.buffer = bytearray()

    def handlewsgi(self):
        raise Exception()
    def fileno(self):
        raise Exception()
    def writehead(self, status, headers):
        raise Exception()
    def flush(self):
        raise Exception()
    def close(self):
        pass
    def writedata(self, data):
        self.buffer.extend(data)

    def flushreq(self):
        if not self.respsent:
            if not self.status:
                raise Exception("Cannot send response body before starting response.")
            self.respsent = True
            self.writehead(self.status, self.headers)

    def write(self, data):
        if not data:
            return
        self.flushreq()
        self.writedata(data)
        self.handler.ckflush(self)

    def startreq(self, status, headers, exc_info=None):
        if self.status:
            if exc_info:
                try:
                    if self.respsent:
                        raise exc_info[1]
                finally:
                    exc_info = None
            else:
                raise Exception("Can only start responding once.")
        self.status = status
        self.headers = headers
        return self.write

class handler(object):
    def handle(self, request):
        raise Exception()
    def ckflush(self, req):
        while len(req.buffer) > 0:
            rls, wls, els = select.select([], [req], [req])
            req.flush()
    def close(self):
        pass

    @classmethod
    def parseargs(cls, **args):
        if len(args) > 0:
            raise ValueError("unknown handler argument: " + next(iter(args)))
        return {}

class single(handler):
    cname = "single"

    def handle(self, req):
        try:
            env = req.mkenv()
            with perf.request(env) as reqevent:
                respiter = req.handlewsgi(env, req.startreq)
                for data in respiter:
                    req.write(data)
                if req.status:
                    reqevent.response([req.status, req.headers])
                    req.flushreq()
                self.ckflush(req)
        except closed:
            pass
        except:
            log.error("exception occurred when handling request", exc_info=True)
        finally:
            req.close()

def dbg(*a):
    f = True
    for o in a:
        if not f:
            sys.stderr.write(" ")
        sys.stderr.write(str(a))
        f = False
    sys.stderr.write("\n")
    sys.stderr.flush()

class freethread(handler):
    cname = "free"

    def __init__(self, *, max=None, timeout=None, **kw):
        super().__init__(**kw)
        self.current = set()
        self.lk = threading.Lock()
        self.tcond = threading.Condition(self.lk)
        self.max = max
        self.timeout = timeout

    @classmethod
    def parseargs(cls, *, max=None, abort=None, **args):
        ret = super().parseargs(**args)
        if max:
            ret["max"] = int(max)
        if abort:
            ret["timeout"] = int(abort)
        return ret

    def handle(self, req):
        with self.lk:
            if self.max is not None:
                if self.timeout is not None:
                    now = start = time.time()
                    while len(self.current) >= self.max:
                        self.tcond.wait(start + self.timeout - now)
                        now = time.time()
                        if now - start > self.timeout:
                            os.abort()
                else:
                    while len(self.current) >= self.max:
                        self.tcond.wait()
            th = reqthread(target=self.run, args=[req])
            th.registered = False
            th.start()
            while not th.registered:
                self.tcond.wait()

    def run(self, req):
        try:
            th = threading.current_thread()
            with self.lk:
                self.current.add(th)
                th.registered = True
                self.tcond.notify_all()
            try:
                env = req.mkenv()
                with perf.request(env) as reqevent:
                    respiter = req.handlewsgi(env, req.startreq)
                    for data in respiter:
                        req.write(data)
                    if req.status:
                        reqevent.response([req.status, req.headers])
                        req.flushreq()
                    self.ckflush(req)
            except closed:
                pass
            except:
                log.error("exception occurred when handling request", exc_info=True)
            finally:
                with self.lk:
                    self.current.remove(th)
                    self.tcond.notify_all()
        finally:
            req.close()

    def close(self):
        while True:
            with self.lk:
                if len(self.current) > 0:
                    th = next(iter(self.current))
                else:
                    return
            th.join()

class threadpool(handler):
    cname = "pool"

    def __init__(self, *, max=25, qsz=100, timeout=None, **kw):
        super().__init__(**kw)
        self.current = set()
        self.clk = threading.Lock()
        self.ccond = threading.Condition(self.clk)
        self.queue = collections.deque()
        self.waiting = set()
        self.qlk = threading.Lock()
        self.qcond = threading.Condition(self.qlk)
        self.max = max
        self.qsz = qsz
        self.timeout = timeout

    @classmethod
    def parseargs(cls, *, max=None, queue=None, abort=None, **args):
        ret = super().parseargs(**args)
        if max:
            ret["max"] = int(max)
        if queue:
            ret["qsz"] = int(queue)
        if abort:
            ret["timeout"] = int(abort)
        return ret

    def handle(self, req):
        start = False
        with self.qlk:
            if self.timeout is not None:
                now = start = time.time()
                while len(self.queue) >= self.qsz:
                    self.qcond.wait(start + self.timeout - now)
                    now = time.time()
                    if now - start > self.timeout:
                        os.abort()
            else:
                while len(self.current) >= self.qsz:
                    self.qcond.wait()
            self.queue.append(req)
            self.qcond.notify()
            if len(self.waiting) < 1:
                start = True
        if start:
            with self.clk:
                if len(self.current) < self.max:
                    th = reqthread(target=self.run)
                    th.registered = False
                    th.start()
                    while not th.registered:
                        self.ccond.wait()

    def handle1(self, req):
        try:
            env = req.mkenv()
            with perf.request(env) as reqevent:
                respiter = req.handlewsgi(env, req.startreq)
                for data in respiter:
                    req.write(data)
                if req.status:
                    reqevent.response([req.status, req.headers])
                    req.flushreq()
                self.ckflush(req)
        except closed:
            pass
        except:
            log.error("exception occurred when handling request", exc_info=True)

    def run(self):
        timeout = 10.0
        th = threading.current_thread()
        with self.clk:
            self.current.add(th)
            th.registered = True
            self.ccond.notify_all()
        try:
            while True:
                start = now = time.time()
                with self.qlk:
                    while len(self.queue) < 1:
                        self.waiting.add(th)
                        self.qcond.wait(start + timeout - now)
                        self.waiting.remove(th)
                        now = time.time()
                        if now - start > timeout:
                            return
                    req = self.queue.popleft()
                try:
                    self.handle1(req)
                finally:
                    req.close()
        finally:
            with self.clk:
                self.current.remove(th)

    def close(self):
        while True:
            with self.lk:
                if len(self.current) > 0:
                    th = next(iter(self.current))
                else:
                    return
            th.join()

class resplex(handler):
    cname = "rplex"

    def __init__(self, *, max=None, **kw):
        super().__init__(**kw)
        self.current = set()
        self.lk = threading.Lock()
        self.tcond = threading.Condition(self.lk)
        self.max = max
        self.cqueue = queue.Queue(5)
        self.cnpipe = os.pipe()
        self.rthread = reqthread(name="Response thread", target=self.handle2)
        self.rthread.start()

    @classmethod
    def parseargs(cls, *, max=None, **args):
        ret = super().parseargs(**args)
        if max:
            ret["max"] = int(max)
        return ret

    def ckflush(self, req):
        raise Exception("resplex handler does not support the write() function")

    def handle(self, req):
        with self.lk:
            if self.max is not None:
                while len(self.current) >= self.max:
                    self.tcond.wait()
            th = reqthread(target=self.handle1, args=[req])
            th.registered = False
            th.start()
            while not th.registered:
                self.tcond.wait()

    def handle1(self, req):
        try:
            th = threading.current_thread()
            with self.lk:
                self.current.add(th)
                th.registered = True
                self.tcond.notify_all()
            try:
                env = req.mkenv()
                respobj = req.handlewsgi(env, req.startreq)
                respiter = iter(respobj)
                if not req.status:
                    log.error("request handler returned without calling start_request")
                    if hasattr(respiter, "close"):
                        respiter.close()
                    return
                else:
                    self.cqueue.put((req, respiter))
                    os.write(self.cnpipe[1], b" ")
                    req = None
            finally:
                with self.lk:
                    self.current.remove(th)
                    self.tcond.notify_all()
        except closed:
            pass
        except:
            log.error("exception occurred when handling request", exc_info=True)
        finally:
            if req is not None:
                req.close()

    def handle2(self):
        try:
            rp = self.cnpipe[0]
            current = {}

            def closereq(req):
                respiter = current[req]
                try:
                    if respiter is not None and hasattr(respiter, "close"):
                        respiter.close()
                except:
                    log.error("exception occurred when closing iterator", exc_info=True)
                try:
                    req.close()
                except:
                    log.error("exception occurred when closing request", exc_info=True)
                del current[req]
            def ckiter(req):
                respiter = current[req]
                if respiter is not None:
                    rem = False
                    try:
                        data = next(respiter)
                    except StopIteration:
                        rem = True
                        try:
                            req.flushreq()
                        except:
                            log.error("exception occurred when handling response data", exc_info=True)
                    except:
                        rem = True
                        log.error("exception occurred when iterating response", exc_info=True)
                    if not rem:
                        if data:
                            try:
                                req.flushreq()
                                req.writedata(data)
                            except:
                                log.error("exception occurred when handling response data", exc_info=True)
                                rem = True
                    if rem:
                        current[req] = None
                        try:
                            if hasattr(respiter, "close"):
                                respiter.close()
                        except:
                            log.error("exception occurred when closing iterator", exc_info=True)
                        respiter = None
                if respiter is None and not req.buffer:
                    closereq(req)

            while True:
                bufl = list(req for req in current.keys() if req.buffer)
                rls, wls, els = select.select([rp], bufl, [rp] + bufl)
                if rp in rls:
                    ret = os.read(rp, 1024)
                    if not ret:
                        os.close(rp)
                        return
                    try:
                        while True:
                            req, respiter = self.cqueue.get(False)
                            current[req] = respiter
                            ckiter(req)
                    except queue.Empty:
                        pass
                for req in wls:
                    try:
                        req.flush()
                    except closed:
                        closereq(req)
                    except:
                        log.error("exception occurred when writing response", exc_info=True)
                        closereq(req)
                    else:
                        if len(req.buffer) < 65536:
                            ckiter(req)
        except:
            log.critical("unexpected exception occurred in response handler thread", exc_info=True)
            os.abort()

    def close(self):
        while True:
            with self.lk:
                if len(self.current) > 0:
                    th = next(iter(self.current))
                else:
                    break
            th.join()
        os.close(self.cnpipe[1])
        self.rthread.join()

names = {cls.cname: cls for cls in globals().values() if
         isinstance(cls, type) and
         issubclass(cls, handler) and
         hasattr(cls, "cname")}

def parsehspec(spec):
    if ":" not in spec:
        return spec, {}
    nm, spec = spec.split(":", 1)
    args = {}
    while spec:
        if "," in spec:
            part, spec = spec.split(",", 1)
        else:
            part, spec = spec, None
        if "=" in part:
            key, val = part.split("=", 1)
        else:
            key, val = part, ""
        args[key] = val
    return nm, args
Commit	Line	Data
ab3275e9	1	import sys, os, threading, time, logging, select, queue, collections
46adc298	2	from . import perf
552a70bf FT	3
	4	log = logging.getLogger("ashd.serve")
	5	seq = 1
	6	seqlk = threading.Lock()
	7
	8	def reqseq():
	9	global seq
	10	with seqlk:
	11	s = seq
	12	seq += 1
	13	return s
	14
552a70bf FT	15	class closed(IOError):
	16	def __init__(self):
	17	super().__init__("The client has closed the connection.")
	18
46adc298 FT	19	class reqthread(threading.Thread):
	20	def __init__(self, , name=None, *kw):
	21	if name is None:
	22	name = "Request handler %i" % reqseq()
	23	super().__init__(name=name, **kw)
	24
	25	class wsgirequest(object):
19ff507b	26	def __init__(self, *, handler):
552a70bf FT	27	self.status = None
	28	self.headers = []
	29	self.respsent = False
46adc298 FT	30	self.handler = handler
46adc298 FT	31	self.buffer = bytearray()
552a70bf FT	32
	33	def handlewsgi(self):
	34	raise Exception()
46adc298 FT	35	def fileno(self):
46adc298 FT	36	raise Exception()
552a70bf FT	37	def writehead(self, status, headers):
552a70bf FT	38	raise Exception()
46adc298	39	def flush(self):
552a70bf	40	raise Exception()
46adc298 FT	41	def close(self):
	42	pass
	43	def writedata(self, data):
	44	self.buffer.extend(data)
552a70bf FT	45
	46	def flushreq(self):
	47	if not self.respsent:
	48	if not self.status:
	49	raise Exception("Cannot send response body before starting response.")
	50	self.respsent = True
	51	self.writehead(self.status, self.headers)
	52
46adc298 FT	53	def write(self, data):
	54	if not data:
	55	return
	56	self.flushreq()
	57	self.writedata(data)
	58	self.handler.ckflush(self)
	59
552a70bf FT	60	def startreq(self, status, headers, exc_info=None):
552a70bf FT	61	if self.status:
46adc298	62	if exc_info:
552a70bf FT	63	try:
	64	if self.respsent:
	65	raise exc_info[1]
	66	finally:
46adc298	67	exc_info = None
552a70bf FT	68	else:
	69	raise Exception("Can only start responding once.")
	70	self.status = status
	71	self.headers = headers
	72	return self.write
46adc298 FT	73
	74	class handler(object):
	75	def handle(self, request):
	76	raise Exception()
	77	def ckflush(self, req):
dd1e6b98 FT	78	while len(req.buffer) > 0:
	79	rls, wls, els = select.select([], [req], [req])
	80	req.flush()
46adc298 FT	81	def close(self):
	82	pass
	83
8db41888 FT	84	@classmethod
	85	def parseargs(cls, **args):
	86	if len(args) > 0:
	87	raise ValueError("unknown handler argument: " + next(iter(args)))
	88	return {}
	89
dd1e6b98	90	class single(handler):
5345dcaf FT	91	cname = "single"
5345dcaf FT	92
dd1e6b98 FT	93	def handle(self, req):
	94	try:
	95	env = req.mkenv()
	96	with perf.request(env) as reqevent:
	97	respiter = req.handlewsgi(env, req.startreq)
	98	for data in respiter:
	99	req.write(data)
	100	if req.status:
	101	reqevent.response([req.status, req.headers])
	102	req.flushreq()
	103	self.ckflush(req)
	104	except closed:
	105	pass
	106	except:
	107	log.error("exception occurred when handling request", exc_info=True)
	108	finally:
	109	req.close()
	110
76ff6c4d FT	111	def dbg(*a):
	112	f = True
	113	for o in a:
	114	if not f:
	115	sys.stderr.write(" ")
	116	sys.stderr.write(str(a))
	117	f = False
	118	sys.stderr.write("\n")
	119	sys.stderr.flush()
	120
46adc298	121	class freethread(handler):
5345dcaf FT	122	cname = "free"
5345dcaf FT	123
3a3b78e3	124	def __init__(self, , max=None, timeout=None, *kw):
46adc298 FT	125	super().__init__(**kw)
	126	self.current = set()
	127	self.lk = threading.Lock()
002ee932 FT	128	self.tcond = threading.Condition(self.lk)
002ee932 FT	129	self.max = max
3a3b78e3	130	self.timeout = timeout
002ee932 FT	131
002ee932 FT	132	@classmethod
3a3b78e3	133	def parseargs(cls, , max=None, abort=None, *args):
002ee932 FT	134	ret = super().parseargs(**args)
	135	if max:
	136	ret["max"] = int(max)
3a3b78e3 FT	137	if abort:
3a3b78e3 FT	138	ret["timeout"] = int(abort)
002ee932	139	return ret
46adc298 FT	140
46adc298 FT	141	def handle(self, req):
002ee932	142	with self.lk:
3a3b78e3 FT	143	if self.max is not None:
	144	if self.timeout is not None:
	145	now = start = time.time()
	146	while len(self.current) >= self.max:
	147	self.tcond.wait(start + self.timeout - now)
	148	now = time.time()
	149	if now - start > self.timeout:
	150	os.abort()
	151	else:
	152	while len(self.current) >= self.max:
	153	self.tcond.wait()
002ee932	154	th = reqthread(target=self.run, args=[req])
76ff6c4d	155	th.registered = False
002ee932	156	th.start()
76ff6c4d FT	157	while not th.registered:
76ff6c4d FT	158	self.tcond.wait()
46adc298	159
46adc298	160	def run(self, req):
552a70bf	161	try:
46adc298 FT	162	th = threading.current_thread()
	163	with self.lk:
	164	self.current.add(th)
76ff6c4d	165	th.registered = True
002ee932	166	self.tcond.notify_all()
552a70bf	167	try:
46adc298 FT	168	env = req.mkenv()
	169	with perf.request(env) as reqevent:
	170	respiter = req.handlewsgi(env, req.startreq)
	171	for data in respiter:
	172	req.write(data)
	173	if req.status:
	174	reqevent.response([req.status, req.headers])
	175	req.flushreq()
	176	self.ckflush(req)
	177	except closed:
	178	pass
	179	except:
	180	log.error("exception occurred when handling request", exc_info=True)
552a70bf	181	finally:
46adc298 FT	182	with self.lk:
46adc298 FT	183	self.current.remove(th)
002ee932	184	self.tcond.notify_all()
46adc298 FT	185	finally:
	186	req.close()
	187
	188	def close(self):
	189	while True:
	190	with self.lk:
	191	if len(self.current) > 0:
	192	th = next(iter(self.current))
	193	else:
8db41888	194	return
46adc298 FT	195	th.join()
46adc298 FT	196
ab3275e9 FT	197	class threadpool(handler):
	198	cname = "pool"
	199
	200	def __init__(self, , max=25, qsz=100, timeout=None, *kw):
	201	super().__init__(**kw)
	202	self.current = set()
	203	self.clk = threading.Lock()
	204	self.ccond = threading.Condition(self.clk)
	205	self.queue = collections.deque()
	206	self.waiting = set()
	207	self.qlk = threading.Lock()
	208	self.qcond = threading.Condition(self.qlk)
	209	self.max = max
	210	self.qsz = qsz
	211	self.timeout = timeout
	212
	213	@classmethod
	214	def parseargs(cls, , max=None, queue=None, abort=None, *args):
	215	ret = super().parseargs(**args)
	216	if max:
	217	ret["max"] = int(max)
	218	if queue:
	219	ret["qsz"] = int(queue)
	220	if abort:
	221	ret["timeout"] = int(abort)
	222	return ret
	223
	224	def handle(self, req):
	225	start = False
	226	with self.qlk:
	227	if self.timeout is not None:
	228	now = start = time.time()
	229	while len(self.queue) >= self.qsz:
	230	self.qcond.wait(start + self.timeout - now)
	231	now = time.time()
	232	if now - start > self.timeout:
	233	os.abort()
	234	else:
	235	while len(self.current) >= self.qsz:
	236	self.qcond.wait()
	237	self.queue.append(req)
	238	self.qcond.notify()
	239	if len(self.waiting) < 1:
	240	start = True
	241	if start:
	242	with self.clk:
	243	if len(self.current) < self.max:
	244	th = reqthread(target=self.run)
	245	th.registered = False
	246	th.start()
	247	while not th.registered:
	248	self.ccond.wait()
	249
	250	def handle1(self, req):
	251	try:
	252	env = req.mkenv()
	253	with perf.request(env) as reqevent:
	254	respiter = req.handlewsgi(env, req.startreq)
	255	for data in respiter:
	256	req.write(data)
	257	if req.status:
	258	reqevent.response([req.status, req.headers])
	259	req.flushreq()
	260	self.ckflush(req)
261	except closed:
262	pass
263	except:
264	log.error("exception occurred when handling request", exc_info=True)
265
266	def run(self):
267	timeout = 10.0
268	th = threading.current_thread()
269	with self.clk:
270	self.current.add(th)
271	th.registered = True
272	self.ccond.notify_all()
273	try:
274	while True:
275	start = now = time.time()
276	with self.qlk:
277	while len(self.queue) < 1:
278	self.waiting.add(th)
279	self.qcond.wait(start + timeout - now)
280	self.waiting.remove(th)
281	now = time.time()
282	if now - start > timeout:
283	return
284	req = self.queue.popleft()
285	try:
286	self.handle1(req)
287	finally:
288	req.close()
289	finally:
290	with self.clk:
291	self.current.remove(th)
292
293	def close(self):
294	while True:
295	with self.lk:
296	if len(self.current) > 0:
297	th = next(iter(self.current))
298	else:
299	return
300	th.join()
301
a962c944	302	class resplex(handler):
5345dcaf FT	303	cname = "rplex"
5345dcaf FT	304
48dc900a	305	def __init__(self, , max=None, *kw):
a962c944 FT	306	super().__init__(**kw)
	307	self.current = set()
	308	self.lk = threading.Lock()
48dc900a FT	309	self.tcond = threading.Condition(self.lk)
48dc900a FT	310	self.max = max
a962c944 FT	311	self.cqueue = queue.Queue(5)
	312	self.cnpipe = os.pipe()
	313	self.rthread = reqthread(name="Response thread", target=self.handle2)
	314	self.rthread.start()
	315
48dc900a FT	316	@classmethod
	317	def parseargs(cls, , max=None, *args):
	318	ret = super().parseargs(**args)
	319	if max:
	320	ret["max"] = int(max)
	321	return ret
	322
a962c944 FT	323	def ckflush(self, req):
	324	raise Exception("resplex handler does not support the write() function")
	325
	326	def handle(self, req):
48dc900a FT	327	with self.lk:
	328	if self.max is not None:
	329	while len(self.current) >= self.max:
	330	self.tcond.wait()
	331	th = reqthread(target=self.handle1, args=[req])
76ff6c4d	332	th.registered = False
48dc900a	333	th.start()
76ff6c4d FT	334	while not th.registered:
76ff6c4d FT	335	self.tcond.wait()
a962c944 FT	336
	337	def handle1(self, req):
	338	try:
	339	th = threading.current_thread()
	340	with self.lk:
	341	self.current.add(th)
76ff6c4d	342	th.registered = True
48dc900a	343	self.tcond.notify_all()
a962c944 FT	344	try:
	345	env = req.mkenv()
	346	respobj = req.handlewsgi(env, req.startreq)
	347	respiter = iter(respobj)
	348	if not req.status:
	349	log.error("request handler returned without calling start_request")
	350	if hasattr(respiter, "close"):
	351	respiter.close()
	352	return
	353	else:
	354	self.cqueue.put((req, respiter))
	355	os.write(self.cnpipe[1], b" ")
	356	req = None
	357	finally:
48dc900a FT	358	with self.lk:
	359	self.current.remove(th)
	360	self.tcond.notify_all()
a962c944 FT	361	except closed:
	362	pass
	363	except:
	364	log.error("exception occurred when handling request", exc_info=True)
	365	finally:
	366	if req is not None:
	367	req.close()
	368
	369	def handle2(self):
	370	try:
	371	rp = self.cnpipe[0]
	372	current = {}
	373
	374	def closereq(req):
	375	respiter = current[req]
	376	try:
	377	if respiter is not None and hasattr(respiter, "close"):
	378	respiter.close()
	379	except:
	380	log.error("exception occurred when closing iterator", exc_info=True)
	381	try:
	382	req.close()
	383	except:
	384	log.error("exception occurred when closing request", exc_info=True)
	385	del current[req]
	386	def ckiter(req):
	387	respiter = current[req]
	388	if respiter is not None:
	389	rem = False
	390	try:
	391	data = next(respiter)
	392	except StopIteration:
	393	rem = True
b0a7be65 FT	394	try:
	395	req.flushreq()
	396	except:
	397	log.error("exception occurred when handling response data", exc_info=True)
a962c944 FT	398	except:
	399	rem = True
	400	log.error("exception occurred when iterating response", exc_info=True)
	401	if not rem:
	402	if data:
b0a7be65 FT	403	try:
	404	req.flushreq()
	405	req.writedata(data)
	406	except:
	407	log.error("exception occurred when handling response data", exc_info=True)
	408	rem = True
	409	if rem:
a962c944 FT	410	current[req] = None
	411	try:
	412	if hasattr(respiter, "close"):
	413	respiter.close()
	414	except:
	415	log.error("exception occurred when closing iterator", exc_info=True)
	416	respiter = None
	417	if respiter is None and not req.buffer:
	418	closereq(req)
	419
	420	while True:
	421	bufl = list(req for req in current.keys() if req.buffer)
	422	rls, wls, els = select.select([rp], bufl, [rp] + bufl)
	423	if rp in rls:
	424	ret = os.read(rp, 1024)
	425	if not ret:
	426	os.close(rp)
	427	return
	428	try:
	429	while True:
	430	req, respiter = self.cqueue.get(False)
	431	current[req] = respiter
	432	ckiter(req)
	433	except queue.Empty:
	434	pass
	435	for req in wls:
	436	try:
	437	req.flush()
	438	except closed:
	439	closereq(req)
	440	except:
	441	log.error("exception occurred when writing response", exc_info=True)
	442	closereq(req)
	443	else:
	444	if len(req.buffer) < 65536:
	445	ckiter(req)
	446	except:
	447	log.critical("unexpected exception occurred in response handler thread", exc_info=True)
1b0caaa0	448	os.abort()
a962c944 FT	449
	450	def close(self):
	451	while True:
	452	with self.lk:
	453	if len(self.current) > 0:
	454	th = next(iter(self.current))
	455	else:
	456	break
	457	th.join()
	458	os.close(self.cnpipe[1])
	459	self.rthread.join()
	460
5345dcaf FT	461	names = {cls.cname: cls for cls in globals().values() if
	462	isinstance(cls, type) and
	463	issubclass(cls, handler) and
	464	hasattr(cls, "cname")}
8db41888 FT	465
	466	def parsehspec(spec):
	467	if ":" not in spec:
	468	return spec, {}
	469	nm, spec = spec.split(":", 1)
	470	args = {}
	471	while spec:
	472	if "," in spec:
	473	part, spec = spec.split(",", 1)
	474	else:
	475	part, spec = spec, None
	476	if "=" in part:
	477	key, val = part.split("=", 1)
	478	else:
	479	key, val = part, ""
	480	args[key] = val
	481	return nm, args