forked from sagemath/sagecell
/
kernel_dealer.py
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kernel_dealer.py
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import asyncio
import time
import jupyter_client.session
import tornado.ioloop
import zmq
from log import logger
import misc
config = misc.Config()
class KernelConnection(object):
"""
Kernel from the dealer point of view.
Handles connections over ZMQ sockets to compute kernels.
"""
def __init__(self, dealer, id, connection, lifespan, timeout):
self._on_stop = None
self._dealer = dealer
self.id = id
self.executing = 0
self.status = "starting"
now = time.time()
self.hard_deadline = now + lifespan
self.timeout = timeout
if timeout > 0:
self.deadline = now + self.timeout
self.session = jupyter_client.session.Session(
key=connection["key"].encode())
self.channels = {}
context = zmq.Context.instance()
address = connection["ip"]
if ":" in address:
address = "[{}]".format(address)
for channel, socket_type in (
("shell", zmq.DEALER), ("iopub", zmq.SUB), ("hb", zmq.REQ)):
socket = context.socket(socket_type)
socket.connect("tcp://{}:{}".format(address, connection[channel]))
stream = zmq.eventloop.zmqstream.ZMQStream(socket)
stream.channel = channel
self.channels[channel] = stream
self.channels["iopub"].socket.subscribe(b"")
self.start_hb()
logger.debug("KernelConnection initialized")
def on_stop(self, callback):
self._on_stop = callback
def start_hb(self):
logger.debug("start_hb for %s", self.id)
hb = self.channels["hb"]
ioloop = tornado.ioloop.IOLoop.current()
def pong(message):
#logger.debug("pong for %s", self.id)
self._expecting_pong = False
hb.on_recv(pong)
self._expecting_pong = False
def ping():
#logger.debug("ping for %s", self.id)
now = ioloop.time()
if self._expecting_pong:
logger.warning("kernel %s died unexpectedly", self.id)
self.stop()
elif now > self.hard_deadline:
logger.info("hard deadline reached for %s", self.id)
self.stop()
elif (self.timeout > 0
and now > self.deadline
and self.status == "idle"):
logger.info("kernel %s timed out", self.id)
self.stop()
else:
hb.send(b'ping')
self._expecting_pong = True
self._hb_periodic_callback = tornado.ioloop.PeriodicCallback(
ping, config.get("beat_interval") * 1000)
def start_ping():
logger.debug("start_ping for %s", self.id)
if self.alive:
self._hb_periodic_callback.start()
self._start_ping_handle = ioloop.call_later(
config.get("first_beat"), start_ping)
self.alive = True
def stop(self):
logger.debug("stopping kernel %s", self.id)
if not self.alive:
logger.warning("not alive already")
return
self.stop_hb()
if self._on_stop:
self._on_stop()
for stream in self.channels.values():
stream.close()
self._dealer.stop_kernel(self.id)
def stop_hb(self):
logger.debug("stop_hb for %s", self.id)
self.alive = False
self._hb_periodic_callback.stop()
tornado.ioloop.IOLoop.current().remove_timeout(self._start_ping_handle)
self.channels["hb"].on_recv(None)
class KernelDealer(object):
r"""
Kernel Dealer handles compute kernels on the server side.
"""
def __init__(self, provider_settings):
self.provider_settings = provider_settings
self._available_providers = []
self._connected_providers = {} # provider address: last message time
self._expected_kernels = []
self._get_queue = []
self._kernel_origins = {} # id: provider address
self._kernels = {} # id: KernelConnection
context = zmq.Context.instance()
context.IPV6 = 1
socket = context.socket(zmq.ROUTER)
self.port = socket.bind_to_random_port("tcp://*")
# Can configure perhaps interface/IP/port
self._stream = zmq.eventloop.zmqstream.ZMQStream(socket)
self._stream.on_recv(self._recv)
logger.debug("KernelDealer initialized")
def _try_to_get(self):
r"""
Send a get request if possible AND needed.
"""
while self._available_providers and self._get_queue:
self._stream.send(self._available_providers.pop(0), zmq.SNDMORE)
self._stream.send_json(["get", self._get_queue.pop(0)])
logger.debug("sent get request to a provider")
if self._available_providers:
logger.debug("%s available providers are idling",
len(self._available_providers))
if self._get_queue:
logger.debug("%s get requests are waiting for providers",
len(self._get_queue))
def _recv(self, msg):
logger.debug("received %s", msg)
assert len(msg) == 2
addr = msg[0]
self._connected_providers[addr] = time.time()
msg = zmq.utils.jsonapi.loads(msg[1])
if msg == "get settings":
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json(["settings", self.provider_settings])
elif msg == "ready":
self._available_providers.append(addr)
self._try_to_get()
elif msg[0] == "kernel":
msg = msg[1]
for i, (rlimits, f) in enumerate(self._expected_kernels):
if rlimits == msg["rlimits"]:
self._kernel_origins[msg["id"]] = addr
self._expected_kernels.pop(i)
f.set_result(msg)
break
async def get_kernel(self,
rlimits={}, lifespan=float("inf"), timeout=float("inf")):
f = asyncio.get_running_loop().create_future()
self._expected_kernels.append((rlimits, f))
self._get_queue.append(rlimits)
self._try_to_get()
d = await f
d.pop("rlimits")
d["lifespan"] = lifespan
d["timeout"] = timeout
kernel = KernelConnection(self, **d)
self._kernels[kernel.id] = kernel
logger.debug("tracking %d kernels", len(self._kernels))
logger.info("dealing kernel %s", kernel.id)
return kernel
def kernel(self, id):
return self._kernels[id]
def stop(self):
r"""
Stop all kernels and disconnect all providers.
"""
self._stream.stop_on_recv()
for k in list(self._kernels.values()):
k.stop()
for addr in self._connected_providers:
logger.debug("stopping %r", addr)
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json("disconnect")
self._stream.flush()
def stop_kernel(self, id):
addr = self._kernel_origins.pop(id)
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json(["stop", id])
self._kernels.pop(id)