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

import sys, os, threading, time, logging, select, queue
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):
    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()

class freethread(handler):
    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.start()
            while th.is_alive() and th not in self.current:
                self.tcond.wait()

    def run(self, req):
        try:
            th = threading.current_thread()
            with self.lk:
                self.current.add(th)
                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 resplex(handler):
    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.start()
            while th.is_alive() and th not in self.current:
                self.tcond.wait()

    def handle1(self, req):
        try:
            th = threading.current_thread()
            with self.lk:
                self.current.add(th)
                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
                        req.flushreq()
                    except:
                        rem = True
                        log.error("exception occurred when iterating response", exc_info=True)
                    if not rem:
                        if data:
                            req.flushreq()
                            req.writedata(data)
                    else:
                        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 = {"single": single,
         "free": freethread,
         "rplex": resplex}

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
a962c944	1	import sys, os, threading, time, logging, select, queue
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):
	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 FT	90	class single(handler):
	91	def handle(self, req):
	92	try:
	93	env = req.mkenv()
	94	with perf.request(env) as reqevent:
	95	respiter = req.handlewsgi(env, req.startreq)
	96	for data in respiter:
	97	req.write(data)
	98	if req.status:
	99	reqevent.response([req.status, req.headers])
	100	req.flushreq()
	101	self.ckflush(req)
	102	except closed:
	103	pass
	104	except:
	105	log.error("exception occurred when handling request", exc_info=True)
	106	finally:
	107	req.close()
	108
46adc298	109	class freethread(handler):
3a3b78e3	110	def __init__(self, , max=None, timeout=None, *kw):
46adc298 FT	111	super().__init__(**kw)
	112	self.current = set()
	113	self.lk = threading.Lock()
002ee932 FT	114	self.tcond = threading.Condition(self.lk)
002ee932 FT	115	self.max = max
3a3b78e3	116	self.timeout = timeout
002ee932 FT	117
002ee932 FT	118	@classmethod
3a3b78e3	119	def parseargs(cls, , max=None, abort=None, *args):
002ee932 FT	120	ret = super().parseargs(**args)
	121	if max:
	122	ret["max"] = int(max)
3a3b78e3 FT	123	if abort:
3a3b78e3 FT	124	ret["timeout"] = int(abort)
002ee932	125	return ret
46adc298 FT	126
46adc298 FT	127	def handle(self, req):
002ee932	128	with self.lk:
3a3b78e3 FT	129	if self.max is not None:
	130	if self.timeout is not None:
	131	now = start = time.time()
	132	while len(self.current) >= self.max:
	133	self.tcond.wait(start + self.timeout - now)
	134	now = time.time()
	135	if now - start > self.timeout:
	136	os.abort()
	137	else:
	138	while len(self.current) >= self.max:
	139	self.tcond.wait()
002ee932 FT	140	th = reqthread(target=self.run, args=[req])
	141	th.start()
	142	while th.is_alive() and th not in self.current:
	143	self.tcond.wait()
46adc298	144
46adc298	145	def run(self, req):
552a70bf	146	try:
46adc298 FT	147	th = threading.current_thread()
	148	with self.lk:
	149	self.current.add(th)
002ee932	150	self.tcond.notify_all()
552a70bf	151	try:
46adc298 FT	152	env = req.mkenv()
	153	with perf.request(env) as reqevent:
	154	respiter = req.handlewsgi(env, req.startreq)
	155	for data in respiter:
	156	req.write(data)
	157	if req.status:
	158	reqevent.response([req.status, req.headers])
	159	req.flushreq()
	160	self.ckflush(req)
	161	except closed:
	162	pass
	163	except:
	164	log.error("exception occurred when handling request", exc_info=True)
552a70bf	165	finally:
46adc298 FT	166	with self.lk:
46adc298 FT	167	self.current.remove(th)
002ee932	168	self.tcond.notify_all()
46adc298 FT	169	finally:
	170	req.close()
	171
	172	def close(self):
	173	while True:
	174	with self.lk:
	175	if len(self.current) > 0:
	176	th = next(iter(self.current))
	177	else:
8db41888	178	return
46adc298 FT	179	th.join()
46adc298 FT	180
a962c944	181	class resplex(handler):
48dc900a	182	def __init__(self, , max=None, *kw):
a962c944 FT	183	super().__init__(**kw)
	184	self.current = set()
	185	self.lk = threading.Lock()
48dc900a FT	186	self.tcond = threading.Condition(self.lk)
48dc900a FT	187	self.max = max
a962c944 FT	188	self.cqueue = queue.Queue(5)
	189	self.cnpipe = os.pipe()
	190	self.rthread = reqthread(name="Response thread", target=self.handle2)
	191	self.rthread.start()
	192
48dc900a FT	193	@classmethod
	194	def parseargs(cls, , max=None, *args):
	195	ret = super().parseargs(**args)
	196	if max:
	197	ret["max"] = int(max)
	198	return ret
	199
a962c944 FT	200	def ckflush(self, req):
	201	raise Exception("resplex handler does not support the write() function")
	202
	203	def handle(self, req):
48dc900a FT	204	with self.lk:
	205	if self.max is not None:
	206	while len(self.current) >= self.max:
	207	self.tcond.wait()
	208	th = reqthread(target=self.handle1, args=[req])
	209	th.start()
	210	while th.is_alive() and th not in self.current:
	211	self.tcond.wait()
a962c944 FT	212
	213	def handle1(self, req):
	214	try:
	215	th = threading.current_thread()
	216	with self.lk:
	217	self.current.add(th)
48dc900a	218	self.tcond.notify_all()
a962c944 FT	219	try:
	220	env = req.mkenv()
	221	respobj = req.handlewsgi(env, req.startreq)
	222	respiter = iter(respobj)
	223	if not req.status:
	224	log.error("request handler returned without calling start_request")
	225	if hasattr(respiter, "close"):
	226	respiter.close()
	227	return
	228	else:
	229	self.cqueue.put((req, respiter))
	230	os.write(self.cnpipe[1], b" ")
	231	req = None
	232	finally:
48dc900a FT	233	with self.lk:
	234	self.current.remove(th)
	235	self.tcond.notify_all()
a962c944 FT	236	except closed:
	237	pass
	238	except:
	239	log.error("exception occurred when handling request", exc_info=True)
	240	finally:
	241	if req is not None:
	242	req.close()
	243
	244	def handle2(self):
	245	try:
	246	rp = self.cnpipe[0]
	247	current = {}
	248
	249	def closereq(req):
	250	respiter = current[req]
	251	try:
	252	if respiter is not None and hasattr(respiter, "close"):
	253	respiter.close()
	254	except:
	255	log.error("exception occurred when closing iterator", exc_info=True)
	256	try:
	257	req.close()
	258	except:
	259	log.error("exception occurred when closing request", exc_info=True)
	260	del current[req]
	261	def ckiter(req):
	262	respiter = current[req]
	263	if respiter is not None:
	264	rem = False
	265	try:
	266	data = next(respiter)
	267	except StopIteration:
	268	rem = True
	269	req.flushreq()
	270	except:
	271	rem = True
	272	log.error("exception occurred when iterating response", exc_info=True)
	273	if not rem:
	274	if data:
	275	req.flushreq()
	276	req.writedata(data)
	277	else:
	278	current[req] = None
	279	try:
	280	if hasattr(respiter, "close"):
	281	respiter.close()
	282	except:
	283	log.error("exception occurred when closing iterator", exc_info=True)
	284	respiter = None
	285	if respiter is None and not req.buffer:
	286	closereq(req)
	287
	288	while True:
	289	bufl = list(req for req in current.keys() if req.buffer)
	290	rls, wls, els = select.select([rp], bufl, [rp] + bufl)
	291	if rp in rls:
	292	ret = os.read(rp, 1024)
	293	if not ret:
	294	os.close(rp)
	295	return
	296	try:
	297	while True:
	298	req, respiter = self.cqueue.get(False)
	299	current[req] = respiter
300	ckiter(req)
301	except queue.Empty:
302	pass
303	for req in wls:
304	try:
305	req.flush()
306	except closed:
307	closereq(req)
308	except:
309	log.error("exception occurred when writing response", exc_info=True)
310	closereq(req)
311	else:
312	if len(req.buffer) < 65536:
313	ckiter(req)
314	except:
315	log.critical("unexpected exception occurred in response handler thread", exc_info=True)
1b0caaa0	316	os.abort()
a962c944 FT	317
	318	def close(self):
	319	while True:
	320	with self.lk:
	321	if len(self.current) > 0:
	322	th = next(iter(self.current))
	323	else:
	324	break
	325	th.join()
	326	os.close(self.cnpipe[1])
	327	self.rthread.join()
	328
dd1e6b98 FT	329	names = {"single": single,
dd1e6b98 FT	330	"free": freethread,
a962c944	331	"rplex": resplex}
8db41888 FT	332
	333	def parsehspec(spec):
	334	if ":" not in spec:
	335	return spec, {}
	336	nm, spec = spec.split(":", 1)
	337	args = {}
	338	while spec:
	339	if "," in spec:
	340	part, spec = spec.split(",", 1)
	341	else:
	342	part, spec = spec, None
	343	if "=" in part:
	344	key, val = part.split("=", 1)
	345	else:
	346	key, val = part, ""
	347	args[key] = val
	348	return nm, args