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node.py
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node.py
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import asyncio
import logging
import warnings
import weakref
from tornado.ioloop import IOLoop
from tornado import gen
import dask
from .core import Server, ConnectionPool
from .versions import get_versions
from .utils import DequeHandler, TimeoutError
class Node:
"""
Base class for nodes in a distributed cluster.
"""
def __init__(
self,
connection_limit=512,
deserialize=True,
connection_args=None,
io_loop=None,
serializers=None,
deserializers=None,
timeout=None,
):
self.io_loop = io_loop or IOLoop.current()
self.rpc = ConnectionPool(
limit=connection_limit,
deserialize=deserialize,
serializers=serializers,
deserializers=deserializers,
connection_args=connection_args,
timeout=timeout,
server=self,
)
class ServerNode(Node, Server):
"""
Base class for server nodes in a distributed cluster.
"""
# TODO factor out security, listening, services, etc. here
# XXX avoid inheriting from Server? there is some large potential for confusion
# between base and derived attribute namespaces...
def __init__(
self,
handlers=None,
blocked_handlers=None,
stream_handlers=None,
connection_limit=512,
deserialize=True,
connection_args=None,
io_loop=None,
serializers=None,
deserializers=None,
timeout=None,
):
Node.__init__(
self,
deserialize=deserialize,
connection_limit=connection_limit,
connection_args=connection_args,
io_loop=io_loop,
serializers=serializers,
deserializers=deserializers,
timeout=timeout,
)
Server.__init__(
self,
handlers=handlers,
blocked_handlers=blocked_handlers,
stream_handlers=stream_handlers,
connection_limit=connection_limit,
deserialize=deserialize,
io_loop=self.io_loop,
)
def versions(self, comm=None, packages=None):
return get_versions(packages=packages)
def start_services(self, default_listen_ip):
if default_listen_ip == "0.0.0.0":
default_listen_ip = "" # for IPV6
for k, v in self.service_specs.items():
listen_ip = None
if isinstance(k, tuple):
k, port = k
else:
port = 0
if isinstance(port, str):
port = port.split(":")
if isinstance(port, (tuple, list)):
if len(port) == 2:
listen_ip, port = (port[0], int(port[1]))
elif len(port) == 1:
[listen_ip], port = port, 0
else:
raise ValueError(port)
if isinstance(v, tuple):
v, kwargs = v
else:
kwargs = {}
try:
service = v(self, io_loop=self.loop, **kwargs)
service.listen(
(listen_ip if listen_ip is not None else default_listen_ip, port)
)
self.services[k] = service
except Exception as e:
warnings.warn(
"\nCould not launch service '%s' on port %s. " % (k, port)
+ "Got the following message:\n\n"
+ str(e),
stacklevel=3,
)
def stop_services(self):
for service in self.services.values():
service.stop()
@property
def service_ports(self):
return {k: v.port for k, v in self.services.items()}
def _setup_logging(self, logger):
self._deque_handler = DequeHandler(
n=dask.config.get("distributed.admin.log-length")
)
self._deque_handler.setFormatter(
logging.Formatter(dask.config.get("distributed.admin.log-format"))
)
logger.addHandler(self._deque_handler)
weakref.finalize(self, logger.removeHandler, self._deque_handler)
def get_logs(self, comm=None, n=None):
deque_handler = self._deque_handler
if n is None:
L = list(deque_handler.deque)
else:
L = deque_handler.deque
L = [L[-i] for i in range(min(n, len(L)))]
return [(msg.levelname, deque_handler.format(msg)) for msg in L]
async def __aenter__(self):
await self
return self
async def __aexit__(self, typ, value, traceback):
await self.close()
def __await__(self):
if self.status == "running":
return gen.sleep(0).__await__()
else:
future = self.start()
timeout = getattr(self, "death_timeout", 0)
if timeout:
async def wait_for(future, timeout=None):
try:
await asyncio.wait_for(future, timeout=timeout)
except Exception:
await self.close(timeout=1)
raise TimeoutError(
"{} failed to start in {} seconds".format(
type(self).__name__, timeout
)
)
future = wait_for(future, timeout=timeout)
return future.__await__()
async def start(self): # subclasses should implement this
return self