1371 lines
46 KiB
Python
1371 lines
46 KiB
Python
#
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# Module providing manager classes for dealing
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# with shared objects
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#
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# multiprocessing/managers.py
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# Licensed to PSF under a Contributor Agreement.
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#
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__all__ = [ 'BaseManager', 'SyncManager', 'BaseProxy', 'Token' ]
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#
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# Imports
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#
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import sys
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import threading
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import signal
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import array
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import queue
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import time
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import types
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import os
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from os import getpid
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from traceback import format_exc
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from . import connection
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from .context import reduction, get_spawning_popen, ProcessError
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from . import pool
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from . import process
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from . import util
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from . import get_context
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try:
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from . import shared_memory
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except ImportError:
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HAS_SHMEM = False
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else:
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HAS_SHMEM = True
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__all__.append('SharedMemoryManager')
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#
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# Register some things for pickling
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#
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def reduce_array(a):
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return array.array, (a.typecode, a.tobytes())
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reduction.register(array.array, reduce_array)
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view_types = [type(getattr({}, name)()) for name in ('items','keys','values')]
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if view_types[0] is not list: # only needed in Py3.0
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def rebuild_as_list(obj):
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return list, (list(obj),)
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for view_type in view_types:
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reduction.register(view_type, rebuild_as_list)
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#
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# Type for identifying shared objects
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#
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class Token(object):
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'''
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Type to uniquely identify a shared object
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'''
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__slots__ = ('typeid', 'address', 'id')
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def __init__(self, typeid, address, id):
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(self.typeid, self.address, self.id) = (typeid, address, id)
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def __getstate__(self):
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return (self.typeid, self.address, self.id)
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def __setstate__(self, state):
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(self.typeid, self.address, self.id) = state
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def __repr__(self):
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return '%s(typeid=%r, address=%r, id=%r)' % \
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(self.__class__.__name__, self.typeid, self.address, self.id)
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#
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# Function for communication with a manager's server process
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#
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def dispatch(c, id, methodname, args=(), kwds={}):
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'''
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Send a message to manager using connection `c` and return response
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'''
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c.send((id, methodname, args, kwds))
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kind, result = c.recv()
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if kind == '#RETURN':
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return result
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raise convert_to_error(kind, result)
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def convert_to_error(kind, result):
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if kind == '#ERROR':
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return result
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elif kind in ('#TRACEBACK', '#UNSERIALIZABLE'):
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if not isinstance(result, str):
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raise TypeError(
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"Result {0!r} (kind '{1}') type is {2}, not str".format(
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result, kind, type(result)))
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if kind == '#UNSERIALIZABLE':
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return RemoteError('Unserializable message: %s\n' % result)
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else:
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return RemoteError(result)
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else:
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return ValueError('Unrecognized message type {!r}'.format(kind))
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class RemoteError(Exception):
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def __str__(self):
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return ('\n' + '-'*75 + '\n' + str(self.args[0]) + '-'*75)
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#
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# Functions for finding the method names of an object
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#
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def all_methods(obj):
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'''
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Return a list of names of methods of `obj`
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'''
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temp = []
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for name in dir(obj):
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func = getattr(obj, name)
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if callable(func):
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temp.append(name)
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return temp
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def public_methods(obj):
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'''
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Return a list of names of methods of `obj` which do not start with '_'
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'''
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return [name for name in all_methods(obj) if name[0] != '_']
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#
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# Server which is run in a process controlled by a manager
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#
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class Server(object):
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'''
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Server class which runs in a process controlled by a manager object
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'''
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public = ['shutdown', 'create', 'accept_connection', 'get_methods',
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'debug_info', 'number_of_objects', 'dummy', 'incref', 'decref']
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def __init__(self, registry, address, authkey, serializer):
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if not isinstance(authkey, bytes):
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raise TypeError(
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"Authkey {0!r} is type {1!s}, not bytes".format(
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authkey, type(authkey)))
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self.registry = registry
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self.authkey = process.AuthenticationString(authkey)
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Listener, Client = listener_client[serializer]
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# do authentication later
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self.listener = Listener(address=address, backlog=16)
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self.address = self.listener.address
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self.id_to_obj = {'0': (None, ())}
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self.id_to_refcount = {}
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self.id_to_local_proxy_obj = {}
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self.mutex = threading.Lock()
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def serve_forever(self):
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'''
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Run the server forever
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'''
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self.stop_event = threading.Event()
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process.current_process()._manager_server = self
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try:
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accepter = threading.Thread(target=self.accepter)
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accepter.daemon = True
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accepter.start()
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try:
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while not self.stop_event.is_set():
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self.stop_event.wait(1)
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except (KeyboardInterrupt, SystemExit):
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pass
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finally:
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if sys.stdout != sys.__stdout__: # what about stderr?
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util.debug('resetting stdout, stderr')
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sys.stdout = sys.__stdout__
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sys.stderr = sys.__stderr__
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sys.exit(0)
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def accepter(self):
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while True:
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try:
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c = self.listener.accept()
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except OSError:
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continue
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t = threading.Thread(target=self.handle_request, args=(c,))
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t.daemon = True
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t.start()
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def handle_request(self, c):
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'''
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Handle a new connection
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'''
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funcname = result = request = None
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try:
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connection.deliver_challenge(c, self.authkey)
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connection.answer_challenge(c, self.authkey)
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request = c.recv()
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ignore, funcname, args, kwds = request
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assert funcname in self.public, '%r unrecognized' % funcname
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func = getattr(self, funcname)
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except Exception:
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msg = ('#TRACEBACK', format_exc())
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else:
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try:
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result = func(c, *args, **kwds)
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except Exception:
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msg = ('#TRACEBACK', format_exc())
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else:
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msg = ('#RETURN', result)
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try:
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c.send(msg)
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except Exception as e:
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try:
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c.send(('#TRACEBACK', format_exc()))
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except Exception:
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pass
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util.info('Failure to send message: %r', msg)
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util.info(' ... request was %r', request)
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util.info(' ... exception was %r', e)
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c.close()
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def serve_client(self, conn):
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'''
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Handle requests from the proxies in a particular process/thread
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'''
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util.debug('starting server thread to service %r',
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threading.current_thread().name)
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recv = conn.recv
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send = conn.send
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id_to_obj = self.id_to_obj
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while not self.stop_event.is_set():
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try:
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methodname = obj = None
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request = recv()
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ident, methodname, args, kwds = request
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try:
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obj, exposed, gettypeid = id_to_obj[ident]
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except KeyError as ke:
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try:
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obj, exposed, gettypeid = \
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self.id_to_local_proxy_obj[ident]
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except KeyError:
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raise ke
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if methodname not in exposed:
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raise AttributeError(
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'method %r of %r object is not in exposed=%r' %
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(methodname, type(obj), exposed)
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)
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function = getattr(obj, methodname)
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try:
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res = function(*args, **kwds)
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except Exception as e:
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msg = ('#ERROR', e)
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else:
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typeid = gettypeid and gettypeid.get(methodname, None)
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if typeid:
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rident, rexposed = self.create(conn, typeid, res)
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token = Token(typeid, self.address, rident)
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msg = ('#PROXY', (rexposed, token))
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else:
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msg = ('#RETURN', res)
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except AttributeError:
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if methodname is None:
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msg = ('#TRACEBACK', format_exc())
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else:
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try:
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fallback_func = self.fallback_mapping[methodname]
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result = fallback_func(
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self, conn, ident, obj, *args, **kwds
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)
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msg = ('#RETURN', result)
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except Exception:
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msg = ('#TRACEBACK', format_exc())
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except EOFError:
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util.debug('got EOF -- exiting thread serving %r',
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threading.current_thread().name)
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sys.exit(0)
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except Exception:
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msg = ('#TRACEBACK', format_exc())
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try:
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try:
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send(msg)
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except Exception:
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send(('#UNSERIALIZABLE', format_exc()))
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except Exception as e:
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util.info('exception in thread serving %r',
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threading.current_thread().name)
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util.info(' ... message was %r', msg)
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util.info(' ... exception was %r', e)
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conn.close()
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sys.exit(1)
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def fallback_getvalue(self, conn, ident, obj):
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return obj
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def fallback_str(self, conn, ident, obj):
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return str(obj)
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def fallback_repr(self, conn, ident, obj):
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return repr(obj)
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fallback_mapping = {
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'__str__':fallback_str,
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'__repr__':fallback_repr,
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'#GETVALUE':fallback_getvalue
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}
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def dummy(self, c):
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pass
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def debug_info(self, c):
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'''
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Return some info --- useful to spot problems with refcounting
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'''
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# Perhaps include debug info about 'c'?
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with self.mutex:
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result = []
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keys = list(self.id_to_refcount.keys())
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keys.sort()
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for ident in keys:
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if ident != '0':
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result.append(' %s: refcount=%s\n %s' %
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(ident, self.id_to_refcount[ident],
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str(self.id_to_obj[ident][0])[:75]))
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return '\n'.join(result)
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def number_of_objects(self, c):
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'''
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Number of shared objects
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'''
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# Doesn't use (len(self.id_to_obj) - 1) as we shouldn't count ident='0'
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return len(self.id_to_refcount)
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def shutdown(self, c):
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'''
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Shutdown this process
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'''
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try:
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util.debug('manager received shutdown message')
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c.send(('#RETURN', None))
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except:
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import traceback
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traceback.print_exc()
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finally:
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self.stop_event.set()
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def create(self, c, typeid, /, *args, **kwds):
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'''
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Create a new shared object and return its id
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'''
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with self.mutex:
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callable, exposed, method_to_typeid, proxytype = \
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self.registry[typeid]
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if callable is None:
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if kwds or (len(args) != 1):
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raise ValueError(
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"Without callable, must have one non-keyword argument")
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obj = args[0]
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else:
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obj = callable(*args, **kwds)
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if exposed is None:
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exposed = public_methods(obj)
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if method_to_typeid is not None:
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if not isinstance(method_to_typeid, dict):
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raise TypeError(
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"Method_to_typeid {0!r}: type {1!s}, not dict".format(
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method_to_typeid, type(method_to_typeid)))
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exposed = list(exposed) + list(method_to_typeid)
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ident = '%x' % id(obj) # convert to string because xmlrpclib
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# only has 32 bit signed integers
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util.debug('%r callable returned object with id %r', typeid, ident)
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self.id_to_obj[ident] = (obj, set(exposed), method_to_typeid)
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if ident not in self.id_to_refcount:
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self.id_to_refcount[ident] = 0
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self.incref(c, ident)
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return ident, tuple(exposed)
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def get_methods(self, c, token):
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'''
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Return the methods of the shared object indicated by token
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'''
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return tuple(self.id_to_obj[token.id][1])
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def accept_connection(self, c, name):
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'''
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Spawn a new thread to serve this connection
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'''
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threading.current_thread().name = name
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c.send(('#RETURN', None))
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self.serve_client(c)
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def incref(self, c, ident):
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with self.mutex:
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try:
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self.id_to_refcount[ident] += 1
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except KeyError as ke:
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# If no external references exist but an internal (to the
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# manager) still does and a new external reference is created
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# from it, restore the manager's tracking of it from the
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# previously stashed internal ref.
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if ident in self.id_to_local_proxy_obj:
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self.id_to_refcount[ident] = 1
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self.id_to_obj[ident] = \
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self.id_to_local_proxy_obj[ident]
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obj, exposed, gettypeid = self.id_to_obj[ident]
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util.debug('Server re-enabled tracking & INCREF %r', ident)
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else:
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raise ke
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def decref(self, c, ident):
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if ident not in self.id_to_refcount and \
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ident in self.id_to_local_proxy_obj:
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util.debug('Server DECREF skipping %r', ident)
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return
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with self.mutex:
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if self.id_to_refcount[ident] <= 0:
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raise AssertionError(
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"Id {0!s} ({1!r}) has refcount {2:n}, not 1+".format(
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ident, self.id_to_obj[ident],
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self.id_to_refcount[ident]))
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self.id_to_refcount[ident] -= 1
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if self.id_to_refcount[ident] == 0:
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del self.id_to_refcount[ident]
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if ident not in self.id_to_refcount:
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# Two-step process in case the object turns out to contain other
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# proxy objects (e.g. a managed list of managed lists).
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# Otherwise, deleting self.id_to_obj[ident] would trigger the
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# deleting of the stored value (another managed object) which would
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# in turn attempt to acquire the mutex that is already held here.
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self.id_to_obj[ident] = (None, (), None) # thread-safe
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util.debug('disposing of obj with id %r', ident)
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with self.mutex:
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del self.id_to_obj[ident]
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#
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# Class to represent state of a manager
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#
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class State(object):
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__slots__ = ['value']
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INITIAL = 0
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STARTED = 1
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SHUTDOWN = 2
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#
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# Mapping from serializer name to Listener and Client types
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#
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listener_client = {
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'pickle' : (connection.Listener, connection.Client),
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'xmlrpclib' : (connection.XmlListener, connection.XmlClient)
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}
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#
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# Definition of BaseManager
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#
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class BaseManager(object):
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'''
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Base class for managers
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'''
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_registry = {}
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_Server = Server
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def __init__(self, address=None, authkey=None, serializer='pickle',
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ctx=None):
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if authkey is None:
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authkey = process.current_process().authkey
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self._address = address # XXX not final address if eg ('', 0)
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self._authkey = process.AuthenticationString(authkey)
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self._state = State()
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self._state.value = State.INITIAL
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self._serializer = serializer
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self._Listener, self._Client = listener_client[serializer]
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self._ctx = ctx or get_context()
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def get_server(self):
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'''
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Return server object with serve_forever() method and address attribute
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'''
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if self._state.value != State.INITIAL:
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if self._state.value == State.STARTED:
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raise ProcessError("Already started server")
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elif self._state.value == State.SHUTDOWN:
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raise ProcessError("Manager has shut down")
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else:
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raise ProcessError(
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"Unknown state {!r}".format(self._state.value))
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return Server(self._registry, self._address,
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self._authkey, self._serializer)
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def connect(self):
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'''
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Connect manager object to the server process
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'''
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Listener, Client = listener_client[self._serializer]
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conn = Client(self._address, authkey=self._authkey)
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dispatch(conn, None, 'dummy')
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self._state.value = State.STARTED
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def start(self, initializer=None, initargs=()):
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'''
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Spawn a server process for this manager object
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'''
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if self._state.value != State.INITIAL:
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if self._state.value == State.STARTED:
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raise ProcessError("Already started server")
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elif self._state.value == State.SHUTDOWN:
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raise ProcessError("Manager has shut down")
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else:
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raise ProcessError(
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"Unknown state {!r}".format(self._state.value))
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if initializer is not None and not callable(initializer):
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raise TypeError('initializer must be a callable')
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# pipe over which we will retrieve address of server
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reader, writer = connection.Pipe(duplex=False)
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# spawn process which runs a server
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self._process = self._ctx.Process(
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target=type(self)._run_server,
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args=(self._registry, self._address, self._authkey,
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self._serializer, writer, initializer, initargs),
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)
|
|
ident = ':'.join(str(i) for i in self._process._identity)
|
|
self._process.name = type(self).__name__ + '-' + ident
|
|
self._process.start()
|
|
|
|
# get address of server
|
|
writer.close()
|
|
self._address = reader.recv()
|
|
reader.close()
|
|
|
|
# register a finalizer
|
|
self._state.value = State.STARTED
|
|
self.shutdown = util.Finalize(
|
|
self, type(self)._finalize_manager,
|
|
args=(self._process, self._address, self._authkey,
|
|
self._state, self._Client),
|
|
exitpriority=0
|
|
)
|
|
|
|
@classmethod
|
|
def _run_server(cls, registry, address, authkey, serializer, writer,
|
|
initializer=None, initargs=()):
|
|
'''
|
|
Create a server, report its address and run it
|
|
'''
|
|
# bpo-36368: protect server process from KeyboardInterrupt signals
|
|
signal.signal(signal.SIGINT, signal.SIG_IGN)
|
|
|
|
if initializer is not None:
|
|
initializer(*initargs)
|
|
|
|
# create server
|
|
server = cls._Server(registry, address, authkey, serializer)
|
|
|
|
# inform parent process of the server's address
|
|
writer.send(server.address)
|
|
writer.close()
|
|
|
|
# run the manager
|
|
util.info('manager serving at %r', server.address)
|
|
server.serve_forever()
|
|
|
|
def _create(self, typeid, /, *args, **kwds):
|
|
'''
|
|
Create a new shared object; return the token and exposed tuple
|
|
'''
|
|
assert self._state.value == State.STARTED, 'server not yet started'
|
|
conn = self._Client(self._address, authkey=self._authkey)
|
|
try:
|
|
id, exposed = dispatch(conn, None, 'create', (typeid,)+args, kwds)
|
|
finally:
|
|
conn.close()
|
|
return Token(typeid, self._address, id), exposed
|
|
|
|
def join(self, timeout=None):
|
|
'''
|
|
Join the manager process (if it has been spawned)
|
|
'''
|
|
if self._process is not None:
|
|
self._process.join(timeout)
|
|
if not self._process.is_alive():
|
|
self._process = None
|
|
|
|
def _debug_info(self):
|
|
'''
|
|
Return some info about the servers shared objects and connections
|
|
'''
|
|
conn = self._Client(self._address, authkey=self._authkey)
|
|
try:
|
|
return dispatch(conn, None, 'debug_info')
|
|
finally:
|
|
conn.close()
|
|
|
|
def _number_of_objects(self):
|
|
'''
|
|
Return the number of shared objects
|
|
'''
|
|
conn = self._Client(self._address, authkey=self._authkey)
|
|
try:
|
|
return dispatch(conn, None, 'number_of_objects')
|
|
finally:
|
|
conn.close()
|
|
|
|
def __enter__(self):
|
|
if self._state.value == State.INITIAL:
|
|
self.start()
|
|
if self._state.value != State.STARTED:
|
|
if self._state.value == State.INITIAL:
|
|
raise ProcessError("Unable to start server")
|
|
elif self._state.value == State.SHUTDOWN:
|
|
raise ProcessError("Manager has shut down")
|
|
else:
|
|
raise ProcessError(
|
|
"Unknown state {!r}".format(self._state.value))
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
self.shutdown()
|
|
|
|
@staticmethod
|
|
def _finalize_manager(process, address, authkey, state, _Client):
|
|
'''
|
|
Shutdown the manager process; will be registered as a finalizer
|
|
'''
|
|
if process.is_alive():
|
|
util.info('sending shutdown message to manager')
|
|
try:
|
|
conn = _Client(address, authkey=authkey)
|
|
try:
|
|
dispatch(conn, None, 'shutdown')
|
|
finally:
|
|
conn.close()
|
|
except Exception:
|
|
pass
|
|
|
|
process.join(timeout=1.0)
|
|
if process.is_alive():
|
|
util.info('manager still alive')
|
|
if hasattr(process, 'terminate'):
|
|
util.info('trying to `terminate()` manager process')
|
|
process.terminate()
|
|
process.join(timeout=0.1)
|
|
if process.is_alive():
|
|
util.info('manager still alive after terminate')
|
|
|
|
state.value = State.SHUTDOWN
|
|
try:
|
|
del BaseProxy._address_to_local[address]
|
|
except KeyError:
|
|
pass
|
|
|
|
@property
|
|
def address(self):
|
|
return self._address
|
|
|
|
@classmethod
|
|
def register(cls, typeid, callable=None, proxytype=None, exposed=None,
|
|
method_to_typeid=None, create_method=True):
|
|
'''
|
|
Register a typeid with the manager type
|
|
'''
|
|
if '_registry' not in cls.__dict__:
|
|
cls._registry = cls._registry.copy()
|
|
|
|
if proxytype is None:
|
|
proxytype = AutoProxy
|
|
|
|
exposed = exposed or getattr(proxytype, '_exposed_', None)
|
|
|
|
method_to_typeid = method_to_typeid or \
|
|
getattr(proxytype, '_method_to_typeid_', None)
|
|
|
|
if method_to_typeid:
|
|
for key, value in list(method_to_typeid.items()): # isinstance?
|
|
assert type(key) is str, '%r is not a string' % key
|
|
assert type(value) is str, '%r is not a string' % value
|
|
|
|
cls._registry[typeid] = (
|
|
callable, exposed, method_to_typeid, proxytype
|
|
)
|
|
|
|
if create_method:
|
|
def temp(self, /, *args, **kwds):
|
|
util.debug('requesting creation of a shared %r object', typeid)
|
|
token, exp = self._create(typeid, *args, **kwds)
|
|
proxy = proxytype(
|
|
token, self._serializer, manager=self,
|
|
authkey=self._authkey, exposed=exp
|
|
)
|
|
conn = self._Client(token.address, authkey=self._authkey)
|
|
dispatch(conn, None, 'decref', (token.id,))
|
|
return proxy
|
|
temp.__name__ = typeid
|
|
setattr(cls, typeid, temp)
|
|
|
|
#
|
|
# Subclass of set which get cleared after a fork
|
|
#
|
|
|
|
class ProcessLocalSet(set):
|
|
def __init__(self):
|
|
util.register_after_fork(self, lambda obj: obj.clear())
|
|
def __reduce__(self):
|
|
return type(self), ()
|
|
|
|
#
|
|
# Definition of BaseProxy
|
|
#
|
|
|
|
class BaseProxy(object):
|
|
'''
|
|
A base for proxies of shared objects
|
|
'''
|
|
_address_to_local = {}
|
|
_mutex = util.ForkAwareThreadLock()
|
|
|
|
def __init__(self, token, serializer, manager=None,
|
|
authkey=None, exposed=None, incref=True, manager_owned=False):
|
|
with BaseProxy._mutex:
|
|
tls_idset = BaseProxy._address_to_local.get(token.address, None)
|
|
if tls_idset is None:
|
|
tls_idset = util.ForkAwareLocal(), ProcessLocalSet()
|
|
BaseProxy._address_to_local[token.address] = tls_idset
|
|
|
|
# self._tls is used to record the connection used by this
|
|
# thread to communicate with the manager at token.address
|
|
self._tls = tls_idset[0]
|
|
|
|
# self._idset is used to record the identities of all shared
|
|
# objects for which the current process owns references and
|
|
# which are in the manager at token.address
|
|
self._idset = tls_idset[1]
|
|
|
|
self._token = token
|
|
self._id = self._token.id
|
|
self._manager = manager
|
|
self._serializer = serializer
|
|
self._Client = listener_client[serializer][1]
|
|
|
|
# Should be set to True only when a proxy object is being created
|
|
# on the manager server; primary use case: nested proxy objects.
|
|
# RebuildProxy detects when a proxy is being created on the manager
|
|
# and sets this value appropriately.
|
|
self._owned_by_manager = manager_owned
|
|
|
|
if authkey is not None:
|
|
self._authkey = process.AuthenticationString(authkey)
|
|
elif self._manager is not None:
|
|
self._authkey = self._manager._authkey
|
|
else:
|
|
self._authkey = process.current_process().authkey
|
|
|
|
if incref:
|
|
self._incref()
|
|
|
|
util.register_after_fork(self, BaseProxy._after_fork)
|
|
|
|
def _connect(self):
|
|
util.debug('making connection to manager')
|
|
name = process.current_process().name
|
|
if threading.current_thread().name != 'MainThread':
|
|
name += '|' + threading.current_thread().name
|
|
conn = self._Client(self._token.address, authkey=self._authkey)
|
|
dispatch(conn, None, 'accept_connection', (name,))
|
|
self._tls.connection = conn
|
|
|
|
def _callmethod(self, methodname, args=(), kwds={}):
|
|
'''
|
|
Try to call a method of the referent and return a copy of the result
|
|
'''
|
|
try:
|
|
conn = self._tls.connection
|
|
except AttributeError:
|
|
util.debug('thread %r does not own a connection',
|
|
threading.current_thread().name)
|
|
self._connect()
|
|
conn = self._tls.connection
|
|
|
|
conn.send((self._id, methodname, args, kwds))
|
|
kind, result = conn.recv()
|
|
|
|
if kind == '#RETURN':
|
|
return result
|
|
elif kind == '#PROXY':
|
|
exposed, token = result
|
|
proxytype = self._manager._registry[token.typeid][-1]
|
|
token.address = self._token.address
|
|
proxy = proxytype(
|
|
token, self._serializer, manager=self._manager,
|
|
authkey=self._authkey, exposed=exposed
|
|
)
|
|
conn = self._Client(token.address, authkey=self._authkey)
|
|
dispatch(conn, None, 'decref', (token.id,))
|
|
return proxy
|
|
raise convert_to_error(kind, result)
|
|
|
|
def _getvalue(self):
|
|
'''
|
|
Get a copy of the value of the referent
|
|
'''
|
|
return self._callmethod('#GETVALUE')
|
|
|
|
def _incref(self):
|
|
if self._owned_by_manager:
|
|
util.debug('owned_by_manager skipped INCREF of %r', self._token.id)
|
|
return
|
|
|
|
conn = self._Client(self._token.address, authkey=self._authkey)
|
|
dispatch(conn, None, 'incref', (self._id,))
|
|
util.debug('INCREF %r', self._token.id)
|
|
|
|
self._idset.add(self._id)
|
|
|
|
state = self._manager and self._manager._state
|
|
|
|
self._close = util.Finalize(
|
|
self, BaseProxy._decref,
|
|
args=(self._token, self._authkey, state,
|
|
self._tls, self._idset, self._Client),
|
|
exitpriority=10
|
|
)
|
|
|
|
@staticmethod
|
|
def _decref(token, authkey, state, tls, idset, _Client):
|
|
idset.discard(token.id)
|
|
|
|
# check whether manager is still alive
|
|
if state is None or state.value == State.STARTED:
|
|
# tell manager this process no longer cares about referent
|
|
try:
|
|
util.debug('DECREF %r', token.id)
|
|
conn = _Client(token.address, authkey=authkey)
|
|
dispatch(conn, None, 'decref', (token.id,))
|
|
except Exception as e:
|
|
util.debug('... decref failed %s', e)
|
|
|
|
else:
|
|
util.debug('DECREF %r -- manager already shutdown', token.id)
|
|
|
|
# check whether we can close this thread's connection because
|
|
# the process owns no more references to objects for this manager
|
|
if not idset and hasattr(tls, 'connection'):
|
|
util.debug('thread %r has no more proxies so closing conn',
|
|
threading.current_thread().name)
|
|
tls.connection.close()
|
|
del tls.connection
|
|
|
|
def _after_fork(self):
|
|
self._manager = None
|
|
try:
|
|
self._incref()
|
|
except Exception as e:
|
|
# the proxy may just be for a manager which has shutdown
|
|
util.info('incref failed: %s' % e)
|
|
|
|
def __reduce__(self):
|
|
kwds = {}
|
|
if get_spawning_popen() is not None:
|
|
kwds['authkey'] = self._authkey
|
|
|
|
if getattr(self, '_isauto', False):
|
|
kwds['exposed'] = self._exposed_
|
|
return (RebuildProxy,
|
|
(AutoProxy, self._token, self._serializer, kwds))
|
|
else:
|
|
return (RebuildProxy,
|
|
(type(self), self._token, self._serializer, kwds))
|
|
|
|
def __deepcopy__(self, memo):
|
|
return self._getvalue()
|
|
|
|
def __repr__(self):
|
|
return '<%s object, typeid %r at %#x>' % \
|
|
(type(self).__name__, self._token.typeid, id(self))
|
|
|
|
def __str__(self):
|
|
'''
|
|
Return representation of the referent (or a fall-back if that fails)
|
|
'''
|
|
try:
|
|
return self._callmethod('__repr__')
|
|
except Exception:
|
|
return repr(self)[:-1] + "; '__str__()' failed>"
|
|
|
|
#
|
|
# Function used for unpickling
|
|
#
|
|
|
|
def RebuildProxy(func, token, serializer, kwds):
|
|
'''
|
|
Function used for unpickling proxy objects.
|
|
'''
|
|
server = getattr(process.current_process(), '_manager_server', None)
|
|
if server and server.address == token.address:
|
|
util.debug('Rebuild a proxy owned by manager, token=%r', token)
|
|
kwds['manager_owned'] = True
|
|
if token.id not in server.id_to_local_proxy_obj:
|
|
server.id_to_local_proxy_obj[token.id] = \
|
|
server.id_to_obj[token.id]
|
|
incref = (
|
|
kwds.pop('incref', True) and
|
|
not getattr(process.current_process(), '_inheriting', False)
|
|
)
|
|
return func(token, serializer, incref=incref, **kwds)
|
|
|
|
#
|
|
# Functions to create proxies and proxy types
|
|
#
|
|
|
|
def MakeProxyType(name, exposed, _cache={}):
|
|
'''
|
|
Return a proxy type whose methods are given by `exposed`
|
|
'''
|
|
exposed = tuple(exposed)
|
|
try:
|
|
return _cache[(name, exposed)]
|
|
except KeyError:
|
|
pass
|
|
|
|
dic = {}
|
|
|
|
for meth in exposed:
|
|
exec('''def %s(self, /, *args, **kwds):
|
|
return self._callmethod(%r, args, kwds)''' % (meth, meth), dic)
|
|
|
|
ProxyType = type(name, (BaseProxy,), dic)
|
|
ProxyType._exposed_ = exposed
|
|
_cache[(name, exposed)] = ProxyType
|
|
return ProxyType
|
|
|
|
|
|
def AutoProxy(token, serializer, manager=None, authkey=None,
|
|
exposed=None, incref=True, manager_owned=False):
|
|
'''
|
|
Return an auto-proxy for `token`
|
|
'''
|
|
_Client = listener_client[serializer][1]
|
|
|
|
if exposed is None:
|
|
conn = _Client(token.address, authkey=authkey)
|
|
try:
|
|
exposed = dispatch(conn, None, 'get_methods', (token,))
|
|
finally:
|
|
conn.close()
|
|
|
|
if authkey is None and manager is not None:
|
|
authkey = manager._authkey
|
|
if authkey is None:
|
|
authkey = process.current_process().authkey
|
|
|
|
ProxyType = MakeProxyType('AutoProxy[%s]' % token.typeid, exposed)
|
|
proxy = ProxyType(token, serializer, manager=manager, authkey=authkey,
|
|
incref=incref, manager_owned=manager_owned)
|
|
proxy._isauto = True
|
|
return proxy
|
|
|
|
#
|
|
# Types/callables which we will register with SyncManager
|
|
#
|
|
|
|
class Namespace(object):
|
|
def __init__(self, /, **kwds):
|
|
self.__dict__.update(kwds)
|
|
def __repr__(self):
|
|
items = list(self.__dict__.items())
|
|
temp = []
|
|
for name, value in items:
|
|
if not name.startswith('_'):
|
|
temp.append('%s=%r' % (name, value))
|
|
temp.sort()
|
|
return '%s(%s)' % (self.__class__.__name__, ', '.join(temp))
|
|
|
|
class Value(object):
|
|
def __init__(self, typecode, value, lock=True):
|
|
self._typecode = typecode
|
|
self._value = value
|
|
def get(self):
|
|
return self._value
|
|
def set(self, value):
|
|
self._value = value
|
|
def __repr__(self):
|
|
return '%s(%r, %r)'%(type(self).__name__, self._typecode, self._value)
|
|
value = property(get, set)
|
|
|
|
def Array(typecode, sequence, lock=True):
|
|
return array.array(typecode, sequence)
|
|
|
|
#
|
|
# Proxy types used by SyncManager
|
|
#
|
|
|
|
class IteratorProxy(BaseProxy):
|
|
_exposed_ = ('__next__', 'send', 'throw', 'close')
|
|
def __iter__(self):
|
|
return self
|
|
def __next__(self, *args):
|
|
return self._callmethod('__next__', args)
|
|
def send(self, *args):
|
|
return self._callmethod('send', args)
|
|
def throw(self, *args):
|
|
return self._callmethod('throw', args)
|
|
def close(self, *args):
|
|
return self._callmethod('close', args)
|
|
|
|
|
|
class AcquirerProxy(BaseProxy):
|
|
_exposed_ = ('acquire', 'release')
|
|
def acquire(self, blocking=True, timeout=None):
|
|
args = (blocking,) if timeout is None else (blocking, timeout)
|
|
return self._callmethod('acquire', args)
|
|
def release(self):
|
|
return self._callmethod('release')
|
|
def __enter__(self):
|
|
return self._callmethod('acquire')
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
return self._callmethod('release')
|
|
|
|
|
|
class ConditionProxy(AcquirerProxy):
|
|
_exposed_ = ('acquire', 'release', 'wait', 'notify', 'notify_all')
|
|
def wait(self, timeout=None):
|
|
return self._callmethod('wait', (timeout,))
|
|
def notify(self, n=1):
|
|
return self._callmethod('notify', (n,))
|
|
def notify_all(self):
|
|
return self._callmethod('notify_all')
|
|
def wait_for(self, predicate, timeout=None):
|
|
result = predicate()
|
|
if result:
|
|
return result
|
|
if timeout is not None:
|
|
endtime = time.monotonic() + timeout
|
|
else:
|
|
endtime = None
|
|
waittime = None
|
|
while not result:
|
|
if endtime is not None:
|
|
waittime = endtime - time.monotonic()
|
|
if waittime <= 0:
|
|
break
|
|
self.wait(waittime)
|
|
result = predicate()
|
|
return result
|
|
|
|
|
|
class EventProxy(BaseProxy):
|
|
_exposed_ = ('is_set', 'set', 'clear', 'wait')
|
|
def is_set(self):
|
|
return self._callmethod('is_set')
|
|
def set(self):
|
|
return self._callmethod('set')
|
|
def clear(self):
|
|
return self._callmethod('clear')
|
|
def wait(self, timeout=None):
|
|
return self._callmethod('wait', (timeout,))
|
|
|
|
|
|
class BarrierProxy(BaseProxy):
|
|
_exposed_ = ('__getattribute__', 'wait', 'abort', 'reset')
|
|
def wait(self, timeout=None):
|
|
return self._callmethod('wait', (timeout,))
|
|
def abort(self):
|
|
return self._callmethod('abort')
|
|
def reset(self):
|
|
return self._callmethod('reset')
|
|
@property
|
|
def parties(self):
|
|
return self._callmethod('__getattribute__', ('parties',))
|
|
@property
|
|
def n_waiting(self):
|
|
return self._callmethod('__getattribute__', ('n_waiting',))
|
|
@property
|
|
def broken(self):
|
|
return self._callmethod('__getattribute__', ('broken',))
|
|
|
|
|
|
class NamespaceProxy(BaseProxy):
|
|
_exposed_ = ('__getattribute__', '__setattr__', '__delattr__')
|
|
def __getattr__(self, key):
|
|
if key[0] == '_':
|
|
return object.__getattribute__(self, key)
|
|
callmethod = object.__getattribute__(self, '_callmethod')
|
|
return callmethod('__getattribute__', (key,))
|
|
def __setattr__(self, key, value):
|
|
if key[0] == '_':
|
|
return object.__setattr__(self, key, value)
|
|
callmethod = object.__getattribute__(self, '_callmethod')
|
|
return callmethod('__setattr__', (key, value))
|
|
def __delattr__(self, key):
|
|
if key[0] == '_':
|
|
return object.__delattr__(self, key)
|
|
callmethod = object.__getattribute__(self, '_callmethod')
|
|
return callmethod('__delattr__', (key,))
|
|
|
|
|
|
class ValueProxy(BaseProxy):
|
|
_exposed_ = ('get', 'set')
|
|
def get(self):
|
|
return self._callmethod('get')
|
|
def set(self, value):
|
|
return self._callmethod('set', (value,))
|
|
value = property(get, set)
|
|
|
|
__class_getitem__ = classmethod(types.GenericAlias)
|
|
|
|
|
|
BaseListProxy = MakeProxyType('BaseListProxy', (
|
|
'__add__', '__contains__', '__delitem__', '__getitem__', '__len__',
|
|
'__mul__', '__reversed__', '__rmul__', '__setitem__',
|
|
'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove',
|
|
'reverse', 'sort', '__imul__'
|
|
))
|
|
class ListProxy(BaseListProxy):
|
|
def __iadd__(self, value):
|
|
self._callmethod('extend', (value,))
|
|
return self
|
|
def __imul__(self, value):
|
|
self._callmethod('__imul__', (value,))
|
|
return self
|
|
|
|
|
|
DictProxy = MakeProxyType('DictProxy', (
|
|
'__contains__', '__delitem__', '__getitem__', '__iter__', '__len__',
|
|
'__setitem__', 'clear', 'copy', 'get', 'items',
|
|
'keys', 'pop', 'popitem', 'setdefault', 'update', 'values'
|
|
))
|
|
DictProxy._method_to_typeid_ = {
|
|
'__iter__': 'Iterator',
|
|
}
|
|
|
|
|
|
ArrayProxy = MakeProxyType('ArrayProxy', (
|
|
'__len__', '__getitem__', '__setitem__'
|
|
))
|
|
|
|
|
|
BasePoolProxy = MakeProxyType('PoolProxy', (
|
|
'apply', 'apply_async', 'close', 'imap', 'imap_unordered', 'join',
|
|
'map', 'map_async', 'starmap', 'starmap_async', 'terminate',
|
|
))
|
|
BasePoolProxy._method_to_typeid_ = {
|
|
'apply_async': 'AsyncResult',
|
|
'map_async': 'AsyncResult',
|
|
'starmap_async': 'AsyncResult',
|
|
'imap': 'Iterator',
|
|
'imap_unordered': 'Iterator'
|
|
}
|
|
class PoolProxy(BasePoolProxy):
|
|
def __enter__(self):
|
|
return self
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
self.terminate()
|
|
|
|
#
|
|
# Definition of SyncManager
|
|
#
|
|
|
|
class SyncManager(BaseManager):
|
|
'''
|
|
Subclass of `BaseManager` which supports a number of shared object types.
|
|
|
|
The types registered are those intended for the synchronization
|
|
of threads, plus `dict`, `list` and `Namespace`.
|
|
|
|
The `multiprocessing.Manager()` function creates started instances of
|
|
this class.
|
|
'''
|
|
|
|
SyncManager.register('Queue', queue.Queue)
|
|
SyncManager.register('JoinableQueue', queue.Queue)
|
|
SyncManager.register('Event', threading.Event, EventProxy)
|
|
SyncManager.register('Lock', threading.Lock, AcquirerProxy)
|
|
SyncManager.register('RLock', threading.RLock, AcquirerProxy)
|
|
SyncManager.register('Semaphore', threading.Semaphore, AcquirerProxy)
|
|
SyncManager.register('BoundedSemaphore', threading.BoundedSemaphore,
|
|
AcquirerProxy)
|
|
SyncManager.register('Condition', threading.Condition, ConditionProxy)
|
|
SyncManager.register('Barrier', threading.Barrier, BarrierProxy)
|
|
SyncManager.register('Pool', pool.Pool, PoolProxy)
|
|
SyncManager.register('list', list, ListProxy)
|
|
SyncManager.register('dict', dict, DictProxy)
|
|
SyncManager.register('Value', Value, ValueProxy)
|
|
SyncManager.register('Array', Array, ArrayProxy)
|
|
SyncManager.register('Namespace', Namespace, NamespaceProxy)
|
|
|
|
# types returned by methods of PoolProxy
|
|
SyncManager.register('Iterator', proxytype=IteratorProxy, create_method=False)
|
|
SyncManager.register('AsyncResult', create_method=False)
|
|
|
|
#
|
|
# Definition of SharedMemoryManager and SharedMemoryServer
|
|
#
|
|
|
|
if HAS_SHMEM:
|
|
class _SharedMemoryTracker:
|
|
"Manages one or more shared memory segments."
|
|
|
|
def __init__(self, name, segment_names=[]):
|
|
self.shared_memory_context_name = name
|
|
self.segment_names = segment_names
|
|
|
|
def register_segment(self, segment_name):
|
|
"Adds the supplied shared memory block name to tracker."
|
|
util.debug(f"Register segment {segment_name!r} in pid {getpid()}")
|
|
self.segment_names.append(segment_name)
|
|
|
|
def destroy_segment(self, segment_name):
|
|
"""Calls unlink() on the shared memory block with the supplied name
|
|
and removes it from the list of blocks being tracked."""
|
|
util.debug(f"Destroy segment {segment_name!r} in pid {getpid()}")
|
|
self.segment_names.remove(segment_name)
|
|
segment = shared_memory.SharedMemory(segment_name)
|
|
segment.close()
|
|
segment.unlink()
|
|
|
|
def unlink(self):
|
|
"Calls destroy_segment() on all tracked shared memory blocks."
|
|
for segment_name in self.segment_names[:]:
|
|
self.destroy_segment(segment_name)
|
|
|
|
def __del__(self):
|
|
util.debug(f"Call {self.__class__.__name__}.__del__ in {getpid()}")
|
|
self.unlink()
|
|
|
|
def __getstate__(self):
|
|
return (self.shared_memory_context_name, self.segment_names)
|
|
|
|
def __setstate__(self, state):
|
|
self.__init__(*state)
|
|
|
|
|
|
class SharedMemoryServer(Server):
|
|
|
|
public = Server.public + \
|
|
['track_segment', 'release_segment', 'list_segments']
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
Server.__init__(self, *args, **kwargs)
|
|
address = self.address
|
|
# The address of Linux abstract namespaces can be bytes
|
|
if isinstance(address, bytes):
|
|
address = os.fsdecode(address)
|
|
self.shared_memory_context = \
|
|
_SharedMemoryTracker(f"shm_{address}_{getpid()}")
|
|
util.debug(f"SharedMemoryServer started by pid {getpid()}")
|
|
|
|
def create(self, c, typeid, /, *args, **kwargs):
|
|
"""Create a new distributed-shared object (not backed by a shared
|
|
memory block) and return its id to be used in a Proxy Object."""
|
|
# Unless set up as a shared proxy, don't make shared_memory_context
|
|
# a standard part of kwargs. This makes things easier for supplying
|
|
# simple functions.
|
|
if hasattr(self.registry[typeid][-1], "_shared_memory_proxy"):
|
|
kwargs['shared_memory_context'] = self.shared_memory_context
|
|
return Server.create(self, c, typeid, *args, **kwargs)
|
|
|
|
def shutdown(self, c):
|
|
"Call unlink() on all tracked shared memory, terminate the Server."
|
|
self.shared_memory_context.unlink()
|
|
return Server.shutdown(self, c)
|
|
|
|
def track_segment(self, c, segment_name):
|
|
"Adds the supplied shared memory block name to Server's tracker."
|
|
self.shared_memory_context.register_segment(segment_name)
|
|
|
|
def release_segment(self, c, segment_name):
|
|
"""Calls unlink() on the shared memory block with the supplied name
|
|
and removes it from the tracker instance inside the Server."""
|
|
self.shared_memory_context.destroy_segment(segment_name)
|
|
|
|
def list_segments(self, c):
|
|
"""Returns a list of names of shared memory blocks that the Server
|
|
is currently tracking."""
|
|
return self.shared_memory_context.segment_names
|
|
|
|
|
|
class SharedMemoryManager(BaseManager):
|
|
"""Like SyncManager but uses SharedMemoryServer instead of Server.
|
|
|
|
It provides methods for creating and returning SharedMemory instances
|
|
and for creating a list-like object (ShareableList) backed by shared
|
|
memory. It also provides methods that create and return Proxy Objects
|
|
that support synchronization across processes (i.e. multi-process-safe
|
|
locks and semaphores).
|
|
"""
|
|
|
|
_Server = SharedMemoryServer
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
if os.name == "posix":
|
|
# bpo-36867: Ensure the resource_tracker is running before
|
|
# launching the manager process, so that concurrent
|
|
# shared_memory manipulation both in the manager and in the
|
|
# current process does not create two resource_tracker
|
|
# processes.
|
|
from . import resource_tracker
|
|
resource_tracker.ensure_running()
|
|
BaseManager.__init__(self, *args, **kwargs)
|
|
util.debug(f"{self.__class__.__name__} created by pid {getpid()}")
|
|
|
|
def __del__(self):
|
|
util.debug(f"{self.__class__.__name__}.__del__ by pid {getpid()}")
|
|
pass
|
|
|
|
def get_server(self):
|
|
'Better than monkeypatching for now; merge into Server ultimately'
|
|
if self._state.value != State.INITIAL:
|
|
if self._state.value == State.STARTED:
|
|
raise ProcessError("Already started SharedMemoryServer")
|
|
elif self._state.value == State.SHUTDOWN:
|
|
raise ProcessError("SharedMemoryManager has shut down")
|
|
else:
|
|
raise ProcessError(
|
|
"Unknown state {!r}".format(self._state.value))
|
|
return self._Server(self._registry, self._address,
|
|
self._authkey, self._serializer)
|
|
|
|
def SharedMemory(self, size):
|
|
"""Returns a new SharedMemory instance with the specified size in
|
|
bytes, to be tracked by the manager."""
|
|
with self._Client(self._address, authkey=self._authkey) as conn:
|
|
sms = shared_memory.SharedMemory(None, create=True, size=size)
|
|
try:
|
|
dispatch(conn, None, 'track_segment', (sms.name,))
|
|
except BaseException as e:
|
|
sms.unlink()
|
|
raise e
|
|
return sms
|
|
|
|
def ShareableList(self, sequence):
|
|
"""Returns a new ShareableList instance populated with the values
|
|
from the input sequence, to be tracked by the manager."""
|
|
with self._Client(self._address, authkey=self._authkey) as conn:
|
|
sl = shared_memory.ShareableList(sequence)
|
|
try:
|
|
dispatch(conn, None, 'track_segment', (sl.shm.name,))
|
|
except BaseException as e:
|
|
sl.shm.unlink()
|
|
raise e
|
|
return sl
|