[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):
    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 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
	1	import sys, os, threading, time, logging, select, queue
	2	from . import perf
	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
	15	class closed(IOError):
	16	def __init__(self):
	17	super().__init__("The client has closed the connection.")
	18
	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):
	27	self.status = None
	28	self.headers = []
	29	self.respsent = False
	30	self.handler = handler
	31	self.buffer = bytearray()
	32
	33	def handlewsgi(self):
	34	raise Exception()
	35	def fileno(self):
	36	raise Exception()
	37	def writehead(self, status, headers):
	38	raise Exception()
	39	def flush(self):
	40	raise Exception()
	41	def close(self):
	42	pass
	43	def writedata(self, data):
	44	self.buffer.extend(data)
	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
	53	def write(self, data):
	54	if not data:
	55	return
	56	self.flushreq()
	57	self.writedata(data)
	58	self.handler.ckflush(self)
	59
	60	def startreq(self, status, headers, exc_info=None):
	61	if self.status:
	62	if exc_info:
	63	try:
	64	if self.respsent:
	65	raise exc_info[1]
	66	finally:
	67	exc_info = None
	68	else:
	69	raise Exception("Can only start responding once.")
	70	self.status = status
	71	self.headers = headers
	72	return self.write
	73
	74	class handler(object):
	75	def handle(self, request):
	76	raise Exception()
	77	def ckflush(self, req):
	78	while len(req.buffer) > 0:
	79	rls, wls, els = select.select([], [req], [req])
	80	req.flush()
	81	def close(self):
	82	pass
	83
	84	@classmethod
	85	def parseargs(cls, **args):
	86	if len(args) > 0:
	87	raise ValueError("unknown handler argument: " + next(iter(args)))
	88	return {}
	89
	90	class single(handler):
	91	cname = "single"
	92
	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
	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
	121	class freethread(handler):
	122	cname = "free"
	123
	124	def __init__(self, , max=None, timeout=None, *kw):
	125	super().__init__(**kw)
	126	self.current = set()
	127	self.lk = threading.Lock()
	128	self.tcond = threading.Condition(self.lk)
	129	self.max = max
	130	self.timeout = timeout
	131
	132	@classmethod
	133	def parseargs(cls, , max=None, abort=None, *args):
	134	ret = super().parseargs(**args)
	135	if max:
	136	ret["max"] = int(max)
	137	if abort:
	138	ret["timeout"] = int(abort)
	139	return ret
	140
	141	def handle(self, req):
	142	with self.lk:
	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()
	154	th = reqthread(target=self.run, args=[req])
	155	th.registered = False
	156	th.start()
	157	while not th.registered:
	158	self.tcond.wait()
	159
	160	def run(self, req):
	161	try:
	162	th = threading.current_thread()
	163	with self.lk:
	164	self.current.add(th)
	165	th.registered = True
	166	self.tcond.notify_all()
	167	try:
	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)
	181	finally:
	182	with self.lk:
	183	self.current.remove(th)
	184	self.tcond.notify_all()
	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:
	194	return
	195	th.join()
	196
	197	class resplex(handler):
	198	cname = "rplex"
	199
	200	def __init__(self, , max=None, *kw):
	201	super().__init__(**kw)
	202	self.current = set()
	203	self.lk = threading.Lock()
	204	self.tcond = threading.Condition(self.lk)
	205	self.max = max
	206	self.cqueue = queue.Queue(5)
	207	self.cnpipe = os.pipe()
	208	self.rthread = reqthread(name="Response thread", target=self.handle2)
	209	self.rthread.start()
	210
	211	@classmethod
	212	def parseargs(cls, , max=None, *args):
	213	ret = super().parseargs(**args)
	214	if max:
	215	ret["max"] = int(max)
	216	return ret
	217
	218	def ckflush(self, req):
	219	raise Exception("resplex handler does not support the write() function")
	220
	221	def handle(self, req):
	222	with self.lk:
	223	if self.max is not None:
	224	while len(self.current) >= self.max:
	225	self.tcond.wait()
	226	th = reqthread(target=self.handle1, args=[req])
	227	th.registered = False
	228	th.start()
	229	while not th.registered:
	230	self.tcond.wait()
	231
	232	def handle1(self, req):
	233	try:
	234	th = threading.current_thread()
	235	with self.lk:
	236	self.current.add(th)
	237	th.registered = True
	238	self.tcond.notify_all()
	239	try:
	240	env = req.mkenv()
	241	respobj = req.handlewsgi(env, req.startreq)
	242	respiter = iter(respobj)
	243	if not req.status:
	244	log.error("request handler returned without calling start_request")
	245	if hasattr(respiter, "close"):
	246	respiter.close()
	247	return
	248	else:
	249	self.cqueue.put((req, respiter))
	250	os.write(self.cnpipe[1], b" ")
	251	req = None
	252	finally:
	253	with self.lk:
	254	self.current.remove(th)
	255	self.tcond.notify_all()
	256	except closed:
	257	pass
	258	except:
	259	log.error("exception occurred when handling request", exc_info=True)
	260	finally:
	261	if req is not None:
	262	req.close()
	263
	264	def handle2(self):
	265	try:
	266	rp = self.cnpipe[0]
	267	current = {}
	268
	269	def closereq(req):
	270	respiter = current[req]
	271	try:
	272	if respiter is not None and hasattr(respiter, "close"):
	273	respiter.close()
	274	except:
	275	log.error("exception occurred when closing iterator", exc_info=True)
	276	try:
	277	req.close()
	278	except:
	279	log.error("exception occurred when closing request", exc_info=True)
	280	del current[req]
	281	def ckiter(req):
	282	respiter = current[req]
	283	if respiter is not None:
	284	rem = False
	285	try:
	286	data = next(respiter)
	287	except StopIteration:
	288	rem = True
	289	try:
	290	req.flushreq()
	291	except:
	292	log.error("exception occurred when handling response data", exc_info=True)
	293	except:
	294	rem = True
	295	log.error("exception occurred when iterating response", exc_info=True)
	296	if not rem:
	297	if data:
	298	try:
	299	req.flushreq()
	300	req.writedata(data)
	301	except:
	302	log.error("exception occurred when handling response data", exc_info=True)
	303	rem = True
	304	if rem:
	305	current[req] = None
	306	try:
	307	if hasattr(respiter, "close"):
	308	respiter.close()
	309	except:
	310	log.error("exception occurred when closing iterator", exc_info=True)
	311	respiter = None
	312	if respiter is None and not req.buffer:
	313	closereq(req)
	314
	315	while True:
	316	bufl = list(req for req in current.keys() if req.buffer)
	317	rls, wls, els = select.select([rp], bufl, [rp] + bufl)
	318	if rp in rls:
	319	ret = os.read(rp, 1024)
	320	if not ret:
	321	os.close(rp)
	322	return
	323	try:
	324	while True:
	325	req, respiter = self.cqueue.get(False)
	326	current[req] = respiter
	327	ckiter(req)
	328	except queue.Empty:
	329	pass
	330	for req in wls:
	331	try:
	332	req.flush()
	333	except closed:
	334	closereq(req)
	335	except:
	336	log.error("exception occurred when writing response", exc_info=True)
	337	closereq(req)
	338	else:
	339	if len(req.buffer) < 65536:
	340	ckiter(req)
	341	except:
	342	log.critical("unexpected exception occurred in response handler thread", exc_info=True)
	343	os.abort()
	344
	345	def close(self):
	346	while True:
	347	with self.lk:
	348	if len(self.current) > 0:
	349	th = next(iter(self.current))
	350	else:
	351	break
	352	th.join()
	353	os.close(self.cnpipe[1])
	354	self.rthread.join()
	355
	356	names = {cls.cname: cls for cls in globals().values() if
	357	isinstance(cls, type) and
	358	issubclass(cls, handler) and
	359	hasattr(cls, "cname")}
	360
	361	def parsehspec(spec):
	362	if ":" not in spec:
	363	return spec, {}
	364	nm, spec = spec.split(":", 1)
	365	args = {}
	366	while spec:
	367	if "," in spec:
	368	part, spec = spec.split(",", 1)
	369	else:
	370	part, spec = spec, None
	371	if "=" in part:
	372	key, val = part.split("=", 1)
	373	else:
	374	key, val = part, ""
	375	args[key] = val
	376	return nm, args