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#!/usr/bin/env python
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"""A semi-synchronous Client for the ZMQ controller"""
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import time
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from pprint import pprint
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from IPython.external.decorator import decorator
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import streamsession as ss
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import zmq
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from zmq.eventloop import ioloop, zmqstream
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from remotenamespace import RemoteNamespace
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from view import DirectView
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from dependency import Dependency, depend, require
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def _push(ns):
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globals().update(ns)
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def _pull(keys):
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g = globals()
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if isinstance(keys, (list,tuple)):
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return map(g.get, keys)
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else:
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return g.get(keys)
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def _clear():
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globals().clear()
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def execute(code):
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exec code in globals()
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# decorators for methods:
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@decorator
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def spinfirst(f,self,*args,**kwargs):
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self.spin()
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return f(self, *args, **kwargs)
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@decorator
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def defaultblock(f, self, *args, **kwargs):
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block = kwargs.get('block',None)
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block = self.block if block is None else block
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saveblock = self.block
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self.block = block
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ret = f(self, *args, **kwargs)
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self.block = saveblock
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return ret
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class AbortedTask(object):
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def __init__(self, msg_id):
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self.msg_id = msg_id
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# @decorator
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# def checktargets(f):
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# @wraps(f)
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# def checked_method(self, *args, **kwargs):
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# self._build_targets(kwargs['targets'])
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# return f(self, *args, **kwargs)
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# return checked_method
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# class _ZMQEventLoopThread(threading.Thread):
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#
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# def __init__(self, loop):
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# self.loop = loop
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# threading.Thread.__init__(self)
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#
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# def run(self):
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# self.loop.start()
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#
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class Client(object):
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"""A semi-synchronous client to the IPython ZMQ controller
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Attributes
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----------
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ids : set
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a set of engine IDs
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requesting the ids attribute always synchronizes
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the registration state. To request ids without synchronization,
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use _ids
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history : list of msg_ids
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a list of msg_ids, keeping track of all the execution
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messages you have submitted
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outstanding : set of msg_ids
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a set of msg_ids that have been submitted, but whose
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results have not been received
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results : dict
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a dict of all our results, keyed by msg_id
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block : bool
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determines default behavior when block not specified
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in execution methods
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Methods
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-------
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spin : flushes incoming results and registration state changes
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control methods spin, and requesting `ids` also ensures up to date
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barrier : wait on one or more msg_ids
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execution methods: apply/apply_bound/apply_to
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legacy: execute, run
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query methods: queue_status, get_result
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control methods: abort, kill
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"""
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_connected=False
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_engines=None
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registration_socket=None
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query_socket=None
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control_socket=None
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notification_socket=None
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queue_socket=None
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task_socket=None
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block = False
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outstanding=None
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results = None
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history = None
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debug = False
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def __init__(self, addr, context=None, username=None, debug=False):
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if context is None:
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context = zmq.Context()
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self.context = context
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self.addr = addr
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if username is None:
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self.session = ss.StreamSession()
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else:
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self.session = ss.StreamSession(username)
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self.registration_socket = self.context.socket(zmq.PAIR)
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self.registration_socket.setsockopt(zmq.IDENTITY, self.session.session)
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self.registration_socket.connect(addr)
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self._engines = {}
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self._ids = set()
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self.outstanding=set()
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self.results = {}
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self.history = []
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self.debug = debug
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self.session.debug = debug
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self._notification_handlers = {'registration_notification' : self._register_engine,
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'unregistration_notification' : self._unregister_engine,
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}
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self._queue_handlers = {'execute_reply' : self._handle_execute_reply,
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'apply_reply' : self._handle_apply_reply}
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self._connect()
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@property
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def ids(self):
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self._flush_notifications()
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return self._ids
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def _update_engines(self, engines):
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for k,v in engines.iteritems():
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eid = int(k)
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self._engines[eid] = bytes(v) # force not unicode
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self._ids.add(eid)
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def _build_targets(self, targets):
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if targets is None:
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targets = self._ids
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elif isinstance(targets, str):
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if targets.lower() == 'all':
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targets = self._ids
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else:
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raise TypeError("%r not valid str target, must be 'all'"%(targets))
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elif isinstance(targets, int):
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targets = [targets]
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return [self._engines[t] for t in targets], list(targets)
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def _connect(self):
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"""setup all our socket connections to the controller"""
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if self._connected:
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return
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self._connected=True
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self.session.send(self.registration_socket, 'connection_request')
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idents,msg = self.session.recv(self.registration_socket,mode=0)
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if self.debug:
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pprint(msg)
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msg = ss.Message(msg)
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content = msg.content
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if content.status == 'ok':
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if content.queue:
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self.queue_socket = self.context.socket(zmq.PAIR)
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self.queue_socket.setsockopt(zmq.IDENTITY, self.session.session)
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self.queue_socket.connect(content.queue)
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if content.task:
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self.task_socket = self.context.socket(zmq.PAIR)
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self.task_socket.setsockopt(zmq.IDENTITY, self.session.session)
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self.task_socket.connect(content.task)
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if content.notification:
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self.notification_socket = self.context.socket(zmq.SUB)
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self.notification_socket.connect(content.notification)
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self.notification_socket.setsockopt(zmq.SUBSCRIBE, "")
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if content.query:
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self.query_socket = self.context.socket(zmq.PAIR)
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self.query_socket.setsockopt(zmq.IDENTITY, self.session.session)
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self.query_socket.connect(content.query)
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if content.control:
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self.control_socket = self.context.socket(zmq.PAIR)
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self.control_socket.setsockopt(zmq.IDENTITY, self.session.session)
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self.control_socket.connect(content.control)
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self._update_engines(dict(content.engines))
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else:
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self._connected = False
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raise Exception("Failed to connect!")
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#### handlers and callbacks for incoming messages #######
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def _register_engine(self, msg):
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content = msg['content']
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eid = content['id']
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d = {eid : content['queue']}
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self._update_engines(d)
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self._ids.add(int(eid))
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def _unregister_engine(self, msg):
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# print 'unregister',msg
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content = msg['content']
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eid = int(content['id'])
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if eid in self._ids:
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self._ids.remove(eid)
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self._engines.pop(eid)
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def _handle_execute_reply(self, msg):
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# msg_id = msg['msg_id']
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parent = msg['parent_header']
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msg_id = parent['msg_id']
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if msg_id not in self.outstanding:
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print "got unknown result: %s"%msg_id
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else:
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self.outstanding.remove(msg_id)
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self.results[msg_id] = ss.unwrap_exception(msg['content'])
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def _handle_apply_reply(self, msg):
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# pprint(msg)
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# msg_id = msg['msg_id']
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parent = msg['parent_header']
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msg_id = parent['msg_id']
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if msg_id not in self.outstanding:
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print "got unknown result: %s"%msg_id
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else:
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self.outstanding.remove(msg_id)
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content = msg['content']
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if content['status'] == 'ok':
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self.results[msg_id] = ss.unserialize_object(msg['buffers'])
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elif content['status'] == 'aborted':
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self.results[msg_id] = AbortedTask(msg_id)
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elif content['status'] == 'resubmitted':
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pass # handle resubmission
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else:
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self.results[msg_id] = ss.unwrap_exception(content)
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def _flush_notifications(self):
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"flush incoming notifications of engine registrations"
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msg = self.session.recv(self.notification_socket, mode=zmq.NOBLOCK)
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while msg is not None:
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if self.debug:
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pprint(msg)
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msg = msg[-1]
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msg_type = msg['msg_type']
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handler = self._notification_handlers.get(msg_type, None)
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if handler is None:
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raise Exception("Unhandled message type: %s"%msg.msg_type)
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else:
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handler(msg)
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msg = self.session.recv(self.notification_socket, mode=zmq.NOBLOCK)
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def _flush_results(self, sock):
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"flush incoming task or queue results"
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msg = self.session.recv(sock, mode=zmq.NOBLOCK)
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while msg is not None:
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if self.debug:
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pprint(msg)
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msg = msg[-1]
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msg_type = msg['msg_type']
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handler = self._queue_handlers.get(msg_type, None)
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if handler is None:
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raise Exception("Unhandled message type: %s"%msg.msg_type)
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else:
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handler(msg)
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msg = self.session.recv(sock, mode=zmq.NOBLOCK)
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def _flush_control(self, sock):
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"flush incoming control replies"
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msg = self.session.recv(sock, mode=zmq.NOBLOCK)
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while msg is not None:
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if self.debug:
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pprint(msg)
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msg = self.session.recv(sock, mode=zmq.NOBLOCK)
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###### get/setitem ########
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def __getitem__(self, key):
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if isinstance(key, int):
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if key not in self.ids:
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raise IndexError("No such engine: %i"%key)
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return DirectView(self, key)
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if isinstance(key, slice):
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indices = range(len(self.ids))[key]
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ids = sorted(self._ids)
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key = [ ids[i] for i in indices ]
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# newkeys = sorted(self._ids)[thekeys[k]]
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if isinstance(key, (tuple, list, xrange)):
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_,targets = self._build_targets(list(key))
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return DirectView(self, targets)
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else:
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raise TypeError("key by int/iterable of ints only, not %s"%(type(key)))
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############ begin real methods #############
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def spin(self):
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"""flush incoming notifications and execution results."""
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if self.notification_socket:
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self._flush_notifications()
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if self.queue_socket:
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self._flush_results(self.queue_socket)
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if self.task_socket:
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self._flush_results(self.task_socket)
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if self.control_socket:
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self._flush_control(self.control_socket)
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@spinfirst
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def queue_status(self, targets=None, verbose=False):
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"""fetch the status of engine queues
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Parameters
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----------
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targets : int/str/list of ints/strs
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the engines on which to execute
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default : all
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verbose : bool
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whether to return lengths only, or lists of ids for each element
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"""
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targets = self._build_targets(targets)[1]
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content = dict(targets=targets)
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self.session.send(self.query_socket, "queue_request", content=content)
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idents,msg = self.session.recv(self.query_socket, 0)
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if self.debug:
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pprint(msg)
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return msg['content']
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@spinfirst
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@defaultblock
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def clear(self, targets=None, block=None):
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"""clear the namespace in target(s)"""
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targets = self._build_targets(targets)[0]
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print targets
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for t in targets:
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self.session.send(self.control_socket, 'clear_request', content={},ident=t)
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error = False
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if self.block:
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for i in range(len(targets)):
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idents,msg = self.session.recv(self.control_socket,0)
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if self.debug:
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pprint(msg)
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if msg['content']['status'] != 'ok':
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error = msg['content']
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if error:
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return error
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@spinfirst
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@defaultblock
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def abort(self, msg_ids = None, targets=None, block=None):
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"""abort the Queues of target(s)"""
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targets = self._build_targets(targets)[0]
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print targets
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if isinstance(msg_ids, basestring):
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msg_ids = [msg_ids]
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content = dict(msg_ids=msg_ids)
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for t in targets:
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self.session.send(self.control_socket, 'abort_request',
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content=content, ident=t)
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error = False
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if self.block:
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for i in range(len(targets)):
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idents,msg = self.session.recv(self.control_socket,0)
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if self.debug:
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pprint(msg)
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if msg['content']['status'] != 'ok':
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error = msg['content']
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if error:
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return error
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@spinfirst
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@defaultblock
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def kill(self, targets=None, block=None):
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"""Terminates one or more engine processes."""
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targets = self._build_targets(targets)[0]
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print targets
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for t in targets:
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self.session.send(self.control_socket, 'kill_request', content={},ident=t)
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error = False
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if self.block:
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for i in range(len(targets)):
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idents,msg = self.session.recv(self.control_socket,0)
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if self.debug:
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pprint(msg)
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if msg['content']['status'] != 'ok':
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error = msg['content']
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if error:
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return error
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@defaultblock
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def execute(self, code, targets='all', block=None):
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"""executes `code` on `targets` in blocking or nonblocking manner.
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Parameters
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----------
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code : str
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the code string to be executed
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targets : int/str/list of ints/strs
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the engines on which to execute
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default : all
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block : bool
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whether or not to wait until done
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"""
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# block = self.block if block is None else block
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# saveblock = self.block
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# self.block = block
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result = self.apply(execute, (code,), targets=targets, block=block, bound=True)
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# self.block = saveblock
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return result
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def run(self, code, block=None):
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"""runs `code` on an engine.
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Calls to this are load-balanced.
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Parameters
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----------
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code : str
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the code string to be executed
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block : bool
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whether or not to wait until done
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"""
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result = self.apply(execute, (code,), targets=None, block=block, bound=False)
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return result
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def _apply_balanced(self, f, args, kwargs, bound=True, block=None,
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after=None, follow=None):
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"""the underlying method for applying functions in a load balanced
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|
manner."""
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block = block if block is not None else self.block
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bufs = ss.pack_apply_message(f,args,kwargs)
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content = dict(bound=bound)
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msg = self.session.send(self.task_socket, "apply_request",
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content=content, buffers=bufs)
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msg_id = msg['msg_id']
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self.outstanding.add(msg_id)
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self.history.append(msg_id)
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if block:
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self.barrier(msg_id)
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return self.results[msg_id]
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else:
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return msg_id
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def _apply_direct(self, f, args, kwargs, bound=True, block=None, targets=None,
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after=None, follow=None):
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"""Then underlying method for applying functions to specific engines."""
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block = block if block is not None else self.block
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queues,targets = self._build_targets(targets)
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print queues
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bufs = ss.pack_apply_message(f,args,kwargs)
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if isinstance(after, Dependency):
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after = after.as_dict()
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elif after is None:
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after = []
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if isinstance(follow, Dependency):
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follow = follow.as_dict()
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elif follow is None:
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follow = []
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subheader = dict(after=after, follow=follow)
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content = dict(bound=bound)
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msg_ids = []
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for queue in queues:
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msg = self.session.send(self.queue_socket, "apply_request",
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content=content, buffers=bufs,ident=queue, subheader=subheader)
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msg_id = msg['msg_id']
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|
self.outstanding.add(msg_id)
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self.history.append(msg_id)
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msg_ids.append(msg_id)
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if block:
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self.barrier(msg_ids)
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|
else:
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|
if len(msg_ids) == 1:
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return msg_ids[0]
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else:
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return msg_ids
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if len(msg_ids) == 1:
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return self.results[msg_ids[0]]
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|
else:
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|
result = {}
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|
for target,mid in zip(targets, msg_ids):
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|
result[target] = self.results[mid]
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|
return result
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|
|
|
|
def apply(self, f, args=None, kwargs=None, bound=True, block=None, targets=None,
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|
after=None, follow=None):
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|
"""calls f(*args, **kwargs) on a remote engine(s), returning the result.
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|
|
|
|
if self.block is False:
|
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|
returns msg_id or list of msg_ids
|
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|
else:
|
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|
returns actual result of f(*args, **kwargs)
|
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|
"""
|
|
|
# enforce types of f,args,kwrags
|
|
|
args = args if args is not None else []
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|
|
kwargs = kwargs if kwargs is not None else {}
|
|
|
if not callable(f):
|
|
|
raise TypeError("f must be callable, not %s"%type(f))
|
|
|
if not isinstance(args, (tuple, list)):
|
|
|
raise TypeError("args must be tuple or list, not %s"%type(args))
|
|
|
if not isinstance(kwargs, dict):
|
|
|
raise TypeError("kwargs must be dict, not %s"%type(kwargs))
|
|
|
|
|
|
options = dict(bound=bound, block=block, after=after, follow=follow)
|
|
|
|
|
|
if targets is None:
|
|
|
return self._apply_balanced(f, args, kwargs, **options)
|
|
|
else:
|
|
|
return self._apply_direct(f, args, kwargs, targets=targets, **options)
|
|
|
|
|
|
def push(self, ns, targets=None, block=None):
|
|
|
"""push the contents of `ns` into the namespace on `target`"""
|
|
|
if not isinstance(ns, dict):
|
|
|
raise TypeError("Must be a dict, not %s"%type(ns))
|
|
|
result = self.apply(_push, (ns,), targets=targets, block=block,bound=True)
|
|
|
return result
|
|
|
|
|
|
@spinfirst
|
|
|
def pull(self, keys, targets=None, block=True):
|
|
|
"""pull objects from `target`'s namespace by `keys`"""
|
|
|
|
|
|
result = self.apply(_pull, (keys,), targets=targets, block=block, bound=True)
|
|
|
return result
|
|
|
|
|
|
def barrier(self, msg_ids=None, timeout=-1):
|
|
|
"""waits on one or more `msg_ids`, for up to `timeout` seconds.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
msg_ids : int, str, or list of ints and/or strs
|
|
|
ints are indices to self.history
|
|
|
strs are msg_ids
|
|
|
default: wait on all outstanding messages
|
|
|
timeout : float
|
|
|
a time in seconds, after which to give up.
|
|
|
default is -1, which means no timeout
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
True : when all msg_ids are done
|
|
|
False : timeout reached, msg_ids still outstanding
|
|
|
"""
|
|
|
tic = time.time()
|
|
|
if msg_ids is None:
|
|
|
theids = self.outstanding
|
|
|
else:
|
|
|
if isinstance(msg_ids, (int, str)):
|
|
|
msg_ids = [msg_ids]
|
|
|
theids = set()
|
|
|
for msg_id in msg_ids:
|
|
|
if isinstance(msg_id, int):
|
|
|
msg_id = self.history[msg_id]
|
|
|
theids.add(msg_id)
|
|
|
self.spin()
|
|
|
while theids.intersection(self.outstanding):
|
|
|
if timeout >= 0 and ( time.time()-tic ) > timeout:
|
|
|
break
|
|
|
time.sleep(1e-3)
|
|
|
self.spin()
|
|
|
return len(theids.intersection(self.outstanding)) == 0
|
|
|
|
|
|
@spinfirst
|
|
|
def get_results(self, msg_ids,status_only=False):
|
|
|
"""returns the result of the execute or task request with `msg_id`"""
|
|
|
if not isinstance(msg_ids, (list,tuple)):
|
|
|
msg_ids = [msg_ids]
|
|
|
theids = []
|
|
|
for msg_id in msg_ids:
|
|
|
if isinstance(msg_id, int):
|
|
|
msg_id = self.history[msg_id]
|
|
|
theids.append(msg_id)
|
|
|
|
|
|
content = dict(msg_ids=theids, status_only=status_only)
|
|
|
msg = self.session.send(self.query_socket, "result_request", content=content)
|
|
|
zmq.select([self.query_socket], [], [])
|
|
|
idents,msg = self.session.recv(self.query_socket, zmq.NOBLOCK)
|
|
|
if self.debug:
|
|
|
pprint(msg)
|
|
|
|
|
|
# while True:
|
|
|
# try:
|
|
|
# except zmq.ZMQError:
|
|
|
# time.sleep(1e-3)
|
|
|
# continue
|
|
|
# else:
|
|
|
# break
|
|
|
return msg['content']
|
|
|
|
|
|
class AsynClient(Client):
|
|
|
"""An Asynchronous client, using the Tornado Event Loop"""
|
|
|
io_loop = None
|
|
|
queue_stream = None
|
|
|
notifier_stream = None
|
|
|
|
|
|
def __init__(self, addr, context=None, username=None, debug=False, io_loop=None):
|
|
|
Client.__init__(self, addr, context, username, debug)
|
|
|
if io_loop is None:
|
|
|
io_loop = ioloop.IOLoop.instance()
|
|
|
self.io_loop = io_loop
|
|
|
|
|
|
self.queue_stream = zmqstream.ZMQStream(self.queue_socket, io_loop)
|
|
|
self.control_stream = zmqstream.ZMQStream(self.control_socket, io_loop)
|
|
|
self.task_stream = zmqstream.ZMQStream(self.task_socket, io_loop)
|
|
|
self.notification_stream = zmqstream.ZMQStream(self.notification_socket, io_loop)
|
|
|
|
|
|
def spin(self):
|
|
|
for stream in (self.queue_stream, self.notifier_stream,
|
|
|
self.task_stream, self.control_stream):
|
|
|
stream.flush()
|
|
|
|
