/usr/lib/python3/dist-packages/pyutilib/pyro/dispatcher.py is in python3-pyutilib 5.3.5-1.
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#
# PyUtilib: A Python utility library.
# Copyright (c) 2008 Sandia Corporation.
# This software is distributed under the BSD License.
# Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
# the U.S. Government retains certain rights in this software.
# _________________________________________________________________________
__all__ = ['Dispatcher', 'DispatcherServer']
import os
import sys
import uuid
from collections import defaultdict
from pyutilib.pyro import get_nameserver, using_pyro3, using_pyro4
from pyutilib.pyro import Pyro as _pyro
from pyutilib.pyro.util import set_maxconnections, get_dispatchers
if sys.version_info >= (3,0):
import queue as Queue
else:
import Queue
from six import iteritems
if using_pyro3:
base = _pyro.core.ObjBase
oneway = lambda method: method
elif using_pyro4:
base = object
oneway = _pyro.oneway
else:
base = object
oneway = lambda method: method
def _clear_queue_threadsafe(q):
while not q.empty():
try:
q.get(False)
except Queue.Empty:
continue
q.task_done()
class Dispatcher(base):
def __init__(self, **kwds):
if _pyro is None:
raise ImportError("Pyro or Pyro4 is not available")
if using_pyro3:
_pyro.core.ObjBase.__init__(self)
self._task_queue = defaultdict(Queue.Queue)
self._result_queue = defaultdict(Queue.Queue)
self._verbose = kwds.pop("verbose", False)
self._registered_workers = set()
self._acquired_workers = set()
self._worker_limit = kwds.pop("worker_limit", None)
if self._verbose:
print("Verbose output enabled...")
#
# One-way methods (Pyro4 only)
#
@oneway
def release_acquired_workers(self, names):
names = set(names)
if not names.issubset(self._registered_workers):
raise ValueError("List contains one or more worker names that "
"were not registered")
self._acquired_workers.difference_update(names)
@oneway
def unregister_worker(self, name):
if name not in self._registered_workers:
raise ValueError("Worker name '%s' has not been registered")
if self._verbose:
print("Unregistering worker with name: %s" % (name))
self._registered_workers.remove(name)
@oneway
def shutdown(self):
print("Dispatcher received request to shut down - initiating...")
if using_pyro3:
self.getDaemon().shutdown()
else:
self._pyroDaemon.shutdown()
@oneway
def add_task(self, task, type=None):
if self._verbose:
print("Received request to add task=<Task id="
+str(task['id'])+">; queue type="+str(type))
self._task_queue[type].put(task)
# process a set of tasks in one shot - the input
# is a dictionary from queue type (including None)
# to a list of tasks to be added to that queue.
@oneway
def add_tasks(self, tasks):
if self._verbose:
print("Received request to add bulk task set. Task ids=%s"
% (dict((task_type, [task['id'] for task in tasks[task_type]])
for task_type in tasks)))
for task_type in tasks:
task_queue = self._task_queue[task_type]
for task in tasks[task_type]:
task_queue.put(task)
@oneway
def add_result(self, result, type=None):
if self._verbose:
print("Received request to add result with "
"result="+str(result)+"; queue type="+str(type))
self._result_queue[type].put(result)
# process a set of results in one shot - the input
# is a dictionary from queue type (including None)
# to a list of results to be added to that queue.
@oneway
def add_results(self, results):
if self._verbose:
print("Received request to add bulk result set for task ids=%s"
% (dict((result_type, [result['id']
for result in results[result_type]])
for result_type in results)))
for result_type in results:
result_queue = self._result_queue[result_type]
for result in results[result_type]:
result_queue.put(result)
#
# Methods that do not return anything but are
# not marked oneway for Pyro4 to avoid race conditions
#
def clear_queue(self, type=None):
if self._verbose:
print("Received request to clear task and result "
"queues for queue type="+str(type))
try:
_clear_queue_threadsafe(self._task_queue[type])
except KeyError:
pass
try:
_clear_queue_threadsafe(self._result_queue[type])
except KeyError:
pass
def clear_queues(self, types):
for type in types:
self.clear_queue(type=type)
def clear_all_queues(self):
self._task_queue = defaultdict(Queue.Queue)
self._result_queue = defaultdict(Queue.Queue)
def clear_task_queue(self, type=None):
if self._verbose:
print("Received request to clear task "
"queue for queue type="+str(type))
try:
_clear_queue_threadsafe(self._task_queue[type])
except KeyError:
pass
def clear_task_queues(self, types):
for type in types:
self.clear_task_queue(type=type)
def clear_all_task_queues(self):
self._task_queue = defaultdict(Queue.Queue)
def clear_result_queue(self, type=None):
if self._verbose:
print("Received request to clear result "
"queue for queue type="+str(type))
try:
_clear_queue_threadsafe(self._result_queue[type])
except KeyError:
pass
def clear_result_queues(self, types):
for type in types:
self.clear_result_queue(type=type)
def clear_all_result_queues(self):
self._result_queue = defaultdict(Queue.Queue)
#
# Methods that do return something, so can't
# be marked as oneway for Pyro4
#
def acquire_available_workers(self):
worker_names = self._registered_workers - self._acquired_workers
self._acquired_workers.update(worker_names)
return worker_names
def register_worker(self, name):
if name in self._registered_workers:
raise ValueError("Worker name '%s' has already been registered")
if (self._worker_limit is None) or \
(len(self._registered_workers) < self._worker_limit):
self._registered_workers.add(name)
if self._verbose:
print("Registering worker %s with name: %s"
% (len(self._registered_workers), name))
return True
return False
def get_task(self, type=None, block=True, timeout=5):
if self._verbose:
print("Received request to get a task from "
"queue type="+str(type)+"; block="+str(block)+
"; timeout="+str(timeout)+" seconds")
try:
task = self._task_queue[type].get(block=block,
timeout=timeout)
return task
except Queue.Empty:
return None
def get_tasks(self, type_block_timeout_list):
if self._verbose:
print("Received request to get tasks in bulk. "
"Queue request types="+str(type_block_timeout_list))
ret = {}
for type, block, timeout in type_block_timeout_list:
task_list = []
try:
task_list.append(self._task_queue[type].get(block=block,
timeout=timeout))
except Queue.Empty:
pass
else:
while self._task_queue[type].qsize():
try:
task_list.append(self._task_queue[type].get(block=block,
timeout=timeout))
except Queue.Empty:
pass
if len(task_list) > 0:
ret.setdefault(type, []).extend(task_list)
return ret
def get_result(self, type=None, block=True, timeout=5):
if self._verbose:
print("Received request to get a result from "
"queue type="+str(type)+"; block="+str(block)+
"; timeout="+str(timeout))
try:
return self._result_queue[type].get(block=block,
timeout=timeout)
except Queue.Empty:
return None
def get_results(self, type_block_timeout_list):
if self._verbose:
print("Received request to get results in bulk. "
"Queue request types="+str(type_block_timeout_list))
ret = {}
for type_name, block, timeout in type_block_timeout_list:
result_list = []
try:
result_list.append(self._result_queue[type_name].get(block=block,
timeout=timeout))
except Queue.Empty:
pass
else:
while self._result_queue[type_name].qsize():
try:
result_list.append(
self._result_queue[type_name].get(block=block,
timeout=timeout))
except Queue.Empty:
pass
if len(result_list) > 0:
ret.setdefault(type_name, []).extend(result_list)
return ret
def num_tasks(self, type=None):
if self._verbose:
print("Received request for number of tasks in "
"queue with type="+str(type))
return self._task_queue[type].qsize()
def num_results(self, type=None):
if self._verbose:
print("Received request for number of results in "
"queue with type="+str(type))
return self._result_queue[type].qsize()
def queues_with_results(self):
if self._verbose:
print("Received request for the set of queues with results")
results = []
#
# Iterate over a copy of the contents of the queue, since
# the queue may change while iterating.
#
for queue_name, result_queue in list(self._result_queue.items()):
if result_queue.qsize() > 0:
results.append(queue_name)
return results
def get_results_all_queues(self):
if self._verbose:
print("Received request to obtain all available "
"results from all queues")
results = []
#
# Iterate over a copy of the contents of the queue, since
# the queue may change while iterating.
#
for queue_name, result_queue in list(self._result_queue.items()):
while result_queue.qsize() > 0:
try:
results.append(result_queue.get(block=False, timeout=0))
except Queue.Empty:
pass
return results
def DispatcherServer(group=":PyUtilibServer",
daemon_host=None,
daemon_port=0,
nameserver_host=None,
nameserver_port=None,
verbose=False,
max_allowed_connections=None,
worker_limit=None,
clear_group=True):
set_maxconnections(max_allowed_connections=max_allowed_connections)
#
# main program
#
ns = get_nameserver(host=nameserver_host, port=nameserver_port, caller_name="Dispatcher")
if clear_group:
for name, uri in get_dispatchers(group=group, ns=ns):
print("Multiple dispatchers not allowed.")
print("dispatch_srvr is shutting down...")
return 1
if using_pyro3:
daemon = _pyro.core.Daemon(host=daemon_host, port=daemon_port)
daemon.useNameServer(ns)
else:
daemon = _pyro.Daemon(host=daemon_host, port=daemon_port)
if using_pyro3:
try:
ns.createGroup(group)
except _pyro.errors.NamingError:
pass
try:
ns.createGroup(group+".dispatcher")
except _pyro.errors.NamingError:
pass
if clear_group:
try:
ns.unregister(group+".dispatcher")
except _pyro.errors.NamingError:
pass
else:
if clear_group:
try:
ns.remove(group+".dispatcher")
except _pyro.errors.NamingError:
pass
disp = Dispatcher(verbose=verbose,
worker_limit=worker_limit)
proxy_name = group+".dispatcher."+str(uuid.uuid4())
if using_pyro3:
uri = daemon.connect(disp, proxy_name)
else:
uri = daemon.register(disp, proxy_name)
ns.register(proxy_name, uri)
# There is no need to retain the proxy connection to the
# nameserver, so free up resources on the nameserver thread
if using_pyro4:
ns._pyroRelease()
else:
ns._release()
print("Dispatcher is ready.")
return daemon.requestLoop()
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