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"""The IPython Controller Hub with 0MQ
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This is the master object that handles connections from engines and clients,
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and monitors traffic through the various queues.
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Authors:
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* Min RK
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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import sys
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import time
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from datetime import datetime
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import zmq
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from zmq.eventloop import ioloop
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from zmq.eventloop.zmqstream import ZMQStream
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# internal:
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from IPython.utils.importstring import import_item
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from IPython.utils.traitlets import (
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HasTraits, Instance, Int, Unicode, Dict, Set, Tuple, CBytes, DottedObjectName
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)
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from IPython.parallel import error, util
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from IPython.parallel.factory import RegistrationFactory
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from IPython.zmq.session import SessionFactory
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from .heartmonitor import HeartMonitor
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def _passer(*args, **kwargs):
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return
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def _printer(*args, **kwargs):
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print (args)
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print (kwargs)
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def empty_record():
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"""Return an empty dict with all record keys."""
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return {
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'msg_id' : None,
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'header' : None,
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'content': None,
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'buffers': None,
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'submitted': None,
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'client_uuid' : None,
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'engine_uuid' : None,
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'started': None,
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'completed': None,
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'resubmitted': None,
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'result_header' : None,
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'result_content' : None,
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'result_buffers' : None,
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'queue' : None,
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'pyin' : None,
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'pyout': None,
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'pyerr': None,
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'stdout': '',
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'stderr': '',
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}
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def init_record(msg):
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"""Initialize a TaskRecord based on a request."""
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header = msg['header']
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return {
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'msg_id' : header['msg_id'],
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'header' : header,
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'content': msg['content'],
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'buffers': msg['buffers'],
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'submitted': header['date'],
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'client_uuid' : None,
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'engine_uuid' : None,
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'started': None,
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'completed': None,
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'resubmitted': None,
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'result_header' : None,
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'result_content' : None,
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'result_buffers' : None,
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'queue' : None,
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'pyin' : None,
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'pyout': None,
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'pyerr': None,
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'stdout': '',
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'stderr': '',
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}
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class EngineConnector(HasTraits):
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"""A simple object for accessing the various zmq connections of an object.
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Attributes are:
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id (int): engine ID
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uuid (str): uuid (unused?)
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queue (str): identity of queue's XREQ socket
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registration (str): identity of registration XREQ socket
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heartbeat (str): identity of heartbeat XREQ socket
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"""
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id=Int(0)
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queue=CBytes()
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control=CBytes()
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registration=CBytes()
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heartbeat=CBytes()
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pending=Set()
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class HubFactory(RegistrationFactory):
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"""The Configurable for setting up a Hub."""
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# port-pairs for monitoredqueues:
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hb = Tuple(Int,Int,config=True,
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help="""XREQ/SUB Port pair for Engine heartbeats""")
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def _hb_default(self):
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return tuple(util.select_random_ports(2))
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mux = Tuple(Int,Int,config=True,
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help="""Engine/Client Port pair for MUX queue""")
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def _mux_default(self):
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return tuple(util.select_random_ports(2))
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task = Tuple(Int,Int,config=True,
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help="""Engine/Client Port pair for Task queue""")
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def _task_default(self):
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return tuple(util.select_random_ports(2))
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control = Tuple(Int,Int,config=True,
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help="""Engine/Client Port pair for Control queue""")
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def _control_default(self):
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return tuple(util.select_random_ports(2))
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iopub = Tuple(Int,Int,config=True,
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help="""Engine/Client Port pair for IOPub relay""")
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def _iopub_default(self):
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return tuple(util.select_random_ports(2))
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# single ports:
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mon_port = Int(config=True,
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help="""Monitor (SUB) port for queue traffic""")
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def _mon_port_default(self):
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return util.select_random_ports(1)[0]
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notifier_port = Int(config=True,
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help="""PUB port for sending engine status notifications""")
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def _notifier_port_default(self):
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return util.select_random_ports(1)[0]
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engine_ip = Unicode('127.0.0.1', config=True,
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help="IP on which to listen for engine connections. [default: loopback]")
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engine_transport = Unicode('tcp', config=True,
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help="0MQ transport for engine connections. [default: tcp]")
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client_ip = Unicode('127.0.0.1', config=True,
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help="IP on which to listen for client connections. [default: loopback]")
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client_transport = Unicode('tcp', config=True,
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help="0MQ transport for client connections. [default : tcp]")
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monitor_ip = Unicode('127.0.0.1', config=True,
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help="IP on which to listen for monitor messages. [default: loopback]")
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monitor_transport = Unicode('tcp', config=True,
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help="0MQ transport for monitor messages. [default : tcp]")
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monitor_url = Unicode('')
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db_class = DottedObjectName('IPython.parallel.controller.dictdb.DictDB',
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config=True, help="""The class to use for the DB backend""")
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# not configurable
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db = Instance('IPython.parallel.controller.dictdb.BaseDB')
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heartmonitor = Instance('IPython.parallel.controller.heartmonitor.HeartMonitor')
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def _ip_changed(self, name, old, new):
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self.engine_ip = new
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self.client_ip = new
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self.monitor_ip = new
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self._update_monitor_url()
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def _update_monitor_url(self):
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self.monitor_url = "%s://%s:%i"%(self.monitor_transport, self.monitor_ip, self.mon_port)
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def _transport_changed(self, name, old, new):
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self.engine_transport = new
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self.client_transport = new
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self.monitor_transport = new
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self._update_monitor_url()
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def __init__(self, **kwargs):
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super(HubFactory, self).__init__(**kwargs)
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self._update_monitor_url()
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def construct(self):
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self.init_hub()
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def start(self):
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self.heartmonitor.start()
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self.log.info("Heartmonitor started")
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def init_hub(self):
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"""construct"""
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client_iface = "%s://%s:"%(self.client_transport, self.client_ip) + "%i"
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engine_iface = "%s://%s:"%(self.engine_transport, self.engine_ip) + "%i"
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ctx = self.context
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loop = self.loop
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# Registrar socket
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q = ZMQStream(ctx.socket(zmq.ROUTER), loop)
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q.bind(client_iface % self.regport)
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self.log.info("Hub listening on %s for registration."%(client_iface%self.regport))
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if self.client_ip != self.engine_ip:
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q.bind(engine_iface % self.regport)
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self.log.info("Hub listening on %s for registration."%(engine_iface%self.regport))
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### Engine connections ###
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# heartbeat
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hpub = ctx.socket(zmq.PUB)
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hpub.bind(engine_iface % self.hb[0])
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hrep = ctx.socket(zmq.ROUTER)
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hrep.bind(engine_iface % self.hb[1])
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self.heartmonitor = HeartMonitor(loop=loop, config=self.config, log=self.log,
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pingstream=ZMQStream(hpub,loop),
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pongstream=ZMQStream(hrep,loop)
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)
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### Client connections ###
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# Notifier socket
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n = ZMQStream(ctx.socket(zmq.PUB), loop)
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n.bind(client_iface%self.notifier_port)
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### build and launch the queues ###
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# monitor socket
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sub = ctx.socket(zmq.SUB)
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sub.setsockopt(zmq.SUBSCRIBE, b"")
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sub.bind(self.monitor_url)
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sub.bind('inproc://monitor')
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sub = ZMQStream(sub, loop)
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# connect the db
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self.log.info('Hub using DB backend: %r'%(self.db_class.split()[-1]))
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# cdir = self.config.Global.cluster_dir
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self.db = import_item(str(self.db_class))(session=self.session.session,
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config=self.config, log=self.log)
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time.sleep(.25)
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try:
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scheme = self.config.TaskScheduler.scheme_name
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except AttributeError:
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from .scheduler import TaskScheduler
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scheme = TaskScheduler.scheme_name.get_default_value()
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# build connection dicts
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self.engine_info = {
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'control' : engine_iface%self.control[1],
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'mux': engine_iface%self.mux[1],
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'heartbeat': (engine_iface%self.hb[0], engine_iface%self.hb[1]),
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'task' : engine_iface%self.task[1],
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'iopub' : engine_iface%self.iopub[1],
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# 'monitor' : engine_iface%self.mon_port,
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}
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self.client_info = {
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'control' : client_iface%self.control[0],
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'mux': client_iface%self.mux[0],
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'task' : (scheme, client_iface%self.task[0]),
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'iopub' : client_iface%self.iopub[0],
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'notification': client_iface%self.notifier_port
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}
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self.log.debug("Hub engine addrs: %s"%self.engine_info)
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self.log.debug("Hub client addrs: %s"%self.client_info)
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# resubmit stream
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r = ZMQStream(ctx.socket(zmq.DEALER), loop)
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url = util.disambiguate_url(self.client_info['task'][-1])
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r.setsockopt(zmq.IDENTITY, self.session.bsession)
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r.connect(url)
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self.hub = Hub(loop=loop, session=self.session, monitor=sub, heartmonitor=self.heartmonitor,
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query=q, notifier=n, resubmit=r, db=self.db,
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engine_info=self.engine_info, client_info=self.client_info,
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log=self.log)
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class Hub(SessionFactory):
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"""The IPython Controller Hub with 0MQ connections
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Parameters
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==========
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loop: zmq IOLoop instance
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session: Session object
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<removed> context: zmq context for creating new connections (?)
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queue: ZMQStream for monitoring the command queue (SUB)
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query: ZMQStream for engine registration and client queries requests (XREP)
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heartbeat: HeartMonitor object checking the pulse of the engines
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notifier: ZMQStream for broadcasting engine registration changes (PUB)
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db: connection to db for out of memory logging of commands
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NotImplemented
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engine_info: dict of zmq connection information for engines to connect
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to the queues.
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client_info: dict of zmq connection information for engines to connect
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to the queues.
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"""
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# internal data structures:
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ids=Set() # engine IDs
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keytable=Dict()
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by_ident=Dict()
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engines=Dict()
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clients=Dict()
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hearts=Dict()
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pending=Set()
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queues=Dict() # pending msg_ids keyed by engine_id
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tasks=Dict() # pending msg_ids submitted as tasks, keyed by client_id
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completed=Dict() # completed msg_ids keyed by engine_id
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all_completed=Set() # completed msg_ids keyed by engine_id
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dead_engines=Set() # completed msg_ids keyed by engine_id
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unassigned=Set() # set of task msg_ds not yet assigned a destination
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incoming_registrations=Dict()
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registration_timeout=Int()
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_idcounter=Int(0)
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# objects from constructor:
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query=Instance(ZMQStream)
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monitor=Instance(ZMQStream)
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notifier=Instance(ZMQStream)
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resubmit=Instance(ZMQStream)
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heartmonitor=Instance(HeartMonitor)
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db=Instance(object)
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client_info=Dict()
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engine_info=Dict()
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def __init__(self, **kwargs):
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"""
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# universal:
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loop: IOLoop for creating future connections
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session: streamsession for sending serialized data
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# engine:
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queue: ZMQStream for monitoring queue messages
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query: ZMQStream for engine+client registration and client requests
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heartbeat: HeartMonitor object for tracking engines
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# extra:
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db: ZMQStream for db connection (NotImplemented)
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engine_info: zmq address/protocol dict for engine connections
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client_info: zmq address/protocol dict for client connections
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"""
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super(Hub, self).__init__(**kwargs)
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self.registration_timeout = max(5000, 2*self.heartmonitor.period)
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# validate connection dicts:
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for k,v in self.client_info.iteritems():
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if k == 'task':
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util.validate_url_container(v[1])
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else:
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util.validate_url_container(v)
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# util.validate_url_container(self.client_info)
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util.validate_url_container(self.engine_info)
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# register our callbacks
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self.query.on_recv(self.dispatch_query)
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self.monitor.on_recv(self.dispatch_monitor_traffic)
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self.heartmonitor.add_heart_failure_handler(self.handle_heart_failure)
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self.heartmonitor.add_new_heart_handler(self.handle_new_heart)
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self.monitor_handlers = {b'in' : self.save_queue_request,
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b'out': self.save_queue_result,
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b'intask': self.save_task_request,
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b'outtask': self.save_task_result,
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b'tracktask': self.save_task_destination,
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b'incontrol': _passer,
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b'outcontrol': _passer,
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b'iopub': self.save_iopub_message,
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}
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self.query_handlers = {'queue_request': self.queue_status,
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'result_request': self.get_results,
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'history_request': self.get_history,
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'db_request': self.db_query,
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'purge_request': self.purge_results,
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'load_request': self.check_load,
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'resubmit_request': self.resubmit_task,
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'shutdown_request': self.shutdown_request,
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'registration_request' : self.register_engine,
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'unregistration_request' : self.unregister_engine,
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'connection_request': self.connection_request,
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}
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# ignore resubmit replies
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self.resubmit.on_recv(lambda msg: None, copy=False)
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self.log.info("hub::created hub")
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@property
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def _next_id(self):
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"""gemerate a new ID.
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No longer reuse old ids, just count from 0."""
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newid = self._idcounter
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self._idcounter += 1
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return newid
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# newid = 0
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# incoming = [id[0] for id in self.incoming_registrations.itervalues()]
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# # print newid, self.ids, self.incoming_registrations
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# while newid in self.ids or newid in incoming:
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# newid += 1
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# return newid
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#-----------------------------------------------------------------------------
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# message validation
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#-----------------------------------------------------------------------------
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def _validate_targets(self, targets):
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"""turn any valid targets argument into a list of integer ids"""
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if targets is None:
|
|
|
# default to all
|
|
|
targets = self.ids
|
|
|
|
|
|
if isinstance(targets, (int,str,unicode)):
|
|
|
# only one target specified
|
|
|
targets = [targets]
|
|
|
_targets = []
|
|
|
for t in targets:
|
|
|
# map raw identities to ids
|
|
|
if isinstance(t, (str,unicode)):
|
|
|
t = self.by_ident.get(t, t)
|
|
|
_targets.append(t)
|
|
|
targets = _targets
|
|
|
bad_targets = [ t for t in targets if t not in self.ids ]
|
|
|
if bad_targets:
|
|
|
raise IndexError("No Such Engine: %r"%bad_targets)
|
|
|
if not targets:
|
|
|
raise IndexError("No Engines Registered")
|
|
|
return targets
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# dispatch methods (1 per stream)
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
def dispatch_monitor_traffic(self, msg):
|
|
|
"""all ME and Task queue messages come through here, as well as
|
|
|
IOPub traffic."""
|
|
|
self.log.debug("monitor traffic: %r"%msg[:2])
|
|
|
switch = msg[0]
|
|
|
try:
|
|
|
idents, msg = self.session.feed_identities(msg[1:])
|
|
|
except ValueError:
|
|
|
idents=[]
|
|
|
if not idents:
|
|
|
self.log.error("Bad Monitor Message: %r"%msg)
|
|
|
return
|
|
|
handler = self.monitor_handlers.get(switch, None)
|
|
|
if handler is not None:
|
|
|
handler(idents, msg)
|
|
|
else:
|
|
|
self.log.error("Invalid monitor topic: %r"%switch)
|
|
|
|
|
|
|
|
|
def dispatch_query(self, msg):
|
|
|
"""Route registration requests and queries from clients."""
|
|
|
try:
|
|
|
idents, msg = self.session.feed_identities(msg)
|
|
|
except ValueError:
|
|
|
idents = []
|
|
|
if not idents:
|
|
|
self.log.error("Bad Query Message: %r"%msg)
|
|
|
return
|
|
|
client_id = idents[0]
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg, content=True)
|
|
|
except Exception:
|
|
|
content = error.wrap_exception()
|
|
|
self.log.error("Bad Query Message: %r"%msg, exc_info=True)
|
|
|
self.session.send(self.query, "hub_error", ident=client_id,
|
|
|
content=content)
|
|
|
return
|
|
|
# print client_id, header, parent, content
|
|
|
#switch on message type:
|
|
|
msg_type = msg['header']['msg_type']
|
|
|
self.log.info("client::client %r requested %r"%(client_id, msg_type))
|
|
|
handler = self.query_handlers.get(msg_type, None)
|
|
|
try:
|
|
|
assert handler is not None, "Bad Message Type: %r"%msg_type
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
self.log.error("Bad Message Type: %r"%msg_type, exc_info=True)
|
|
|
self.session.send(self.query, "hub_error", ident=client_id,
|
|
|
content=content)
|
|
|
return
|
|
|
|
|
|
else:
|
|
|
handler(idents, msg)
|
|
|
|
|
|
def dispatch_db(self, msg):
|
|
|
""""""
|
|
|
raise NotImplementedError
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# handler methods (1 per event)
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
#----------------------- Heartbeat --------------------------------------
|
|
|
|
|
|
def handle_new_heart(self, heart):
|
|
|
"""handler to attach to heartbeater.
|
|
|
Called when a new heart starts to beat.
|
|
|
Triggers completion of registration."""
|
|
|
self.log.debug("heartbeat::handle_new_heart(%r)"%heart)
|
|
|
if heart not in self.incoming_registrations:
|
|
|
self.log.info("heartbeat::ignoring new heart: %r"%heart)
|
|
|
else:
|
|
|
self.finish_registration(heart)
|
|
|
|
|
|
|
|
|
def handle_heart_failure(self, heart):
|
|
|
"""handler to attach to heartbeater.
|
|
|
called when a previously registered heart fails to respond to beat request.
|
|
|
triggers unregistration"""
|
|
|
self.log.debug("heartbeat::handle_heart_failure(%r)"%heart)
|
|
|
eid = self.hearts.get(heart, None)
|
|
|
queue = self.engines[eid].queue
|
|
|
if eid is None:
|
|
|
self.log.info("heartbeat::ignoring heart failure %r"%heart)
|
|
|
else:
|
|
|
self.unregister_engine(heart, dict(content=dict(id=eid, queue=queue)))
|
|
|
|
|
|
#----------------------- MUX Queue Traffic ------------------------------
|
|
|
|
|
|
def save_queue_request(self, idents, msg):
|
|
|
if len(idents) < 2:
|
|
|
self.log.error("invalid identity prefix: %r"%idents)
|
|
|
return
|
|
|
queue_id, client_id = idents[:2]
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg)
|
|
|
except Exception:
|
|
|
self.log.error("queue::client %r sent invalid message to %r: %r"%(client_id, queue_id, msg), exc_info=True)
|
|
|
return
|
|
|
|
|
|
eid = self.by_ident.get(queue_id, None)
|
|
|
if eid is None:
|
|
|
self.log.error("queue::target %r not registered"%queue_id)
|
|
|
self.log.debug("queue:: valid are: %r"%(self.by_ident.keys()))
|
|
|
return
|
|
|
record = init_record(msg)
|
|
|
msg_id = record['msg_id']
|
|
|
# Unicode in records
|
|
|
record['engine_uuid'] = queue_id.decode('ascii')
|
|
|
record['client_uuid'] = client_id.decode('ascii')
|
|
|
record['queue'] = 'mux'
|
|
|
|
|
|
try:
|
|
|
# it's posible iopub arrived first:
|
|
|
existing = self.db.get_record(msg_id)
|
|
|
for key,evalue in existing.iteritems():
|
|
|
rvalue = record.get(key, None)
|
|
|
if evalue and rvalue and evalue != rvalue:
|
|
|
self.log.warn("conflicting initial state for record: %r:%r <%r> %r"%(msg_id, rvalue, key, evalue))
|
|
|
elif evalue and not rvalue:
|
|
|
record[key] = evalue
|
|
|
try:
|
|
|
self.db.update_record(msg_id, record)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error updating record %r"%msg_id, exc_info=True)
|
|
|
except KeyError:
|
|
|
try:
|
|
|
self.db.add_record(msg_id, record)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error adding record %r"%msg_id, exc_info=True)
|
|
|
|
|
|
|
|
|
self.pending.add(msg_id)
|
|
|
self.queues[eid].append(msg_id)
|
|
|
|
|
|
def save_queue_result(self, idents, msg):
|
|
|
if len(idents) < 2:
|
|
|
self.log.error("invalid identity prefix: %r"%idents)
|
|
|
return
|
|
|
|
|
|
client_id, queue_id = idents[:2]
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg)
|
|
|
except Exception:
|
|
|
self.log.error("queue::engine %r sent invalid message to %r: %r"%(
|
|
|
queue_id,client_id, msg), exc_info=True)
|
|
|
return
|
|
|
|
|
|
eid = self.by_ident.get(queue_id, None)
|
|
|
if eid is None:
|
|
|
self.log.error("queue::unknown engine %r is sending a reply: "%queue_id)
|
|
|
return
|
|
|
|
|
|
parent = msg['parent_header']
|
|
|
if not parent:
|
|
|
return
|
|
|
msg_id = parent['msg_id']
|
|
|
if msg_id in self.pending:
|
|
|
self.pending.remove(msg_id)
|
|
|
self.all_completed.add(msg_id)
|
|
|
self.queues[eid].remove(msg_id)
|
|
|
self.completed[eid].append(msg_id)
|
|
|
elif msg_id not in self.all_completed:
|
|
|
# it could be a result from a dead engine that died before delivering the
|
|
|
# result
|
|
|
self.log.warn("queue:: unknown msg finished %r"%msg_id)
|
|
|
return
|
|
|
# update record anyway, because the unregistration could have been premature
|
|
|
rheader = msg['header']
|
|
|
completed = rheader['date']
|
|
|
started = rheader.get('started', None)
|
|
|
result = {
|
|
|
'result_header' : rheader,
|
|
|
'result_content': msg['content'],
|
|
|
'started' : started,
|
|
|
'completed' : completed
|
|
|
}
|
|
|
|
|
|
result['result_buffers'] = msg['buffers']
|
|
|
try:
|
|
|
self.db.update_record(msg_id, result)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error updating record %r"%msg_id, exc_info=True)
|
|
|
|
|
|
|
|
|
#--------------------- Task Queue Traffic ------------------------------
|
|
|
|
|
|
def save_task_request(self, idents, msg):
|
|
|
"""Save the submission of a task."""
|
|
|
client_id = idents[0]
|
|
|
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg)
|
|
|
except Exception:
|
|
|
self.log.error("task::client %r sent invalid task message: %r"%(
|
|
|
client_id, msg), exc_info=True)
|
|
|
return
|
|
|
record = init_record(msg)
|
|
|
|
|
|
record['client_uuid'] = client_id
|
|
|
record['queue'] = 'task'
|
|
|
header = msg['header']
|
|
|
msg_id = header['msg_id']
|
|
|
self.pending.add(msg_id)
|
|
|
self.unassigned.add(msg_id)
|
|
|
try:
|
|
|
# it's posible iopub arrived first:
|
|
|
existing = self.db.get_record(msg_id)
|
|
|
if existing['resubmitted']:
|
|
|
for key in ('submitted', 'client_uuid', 'buffers'):
|
|
|
# don't clobber these keys on resubmit
|
|
|
# submitted and client_uuid should be different
|
|
|
# and buffers might be big, and shouldn't have changed
|
|
|
record.pop(key)
|
|
|
# still check content,header which should not change
|
|
|
# but are not expensive to compare as buffers
|
|
|
|
|
|
for key,evalue in existing.iteritems():
|
|
|
if key.endswith('buffers'):
|
|
|
# don't compare buffers
|
|
|
continue
|
|
|
rvalue = record.get(key, None)
|
|
|
if evalue and rvalue and evalue != rvalue:
|
|
|
self.log.warn("conflicting initial state for record: %r:%r <%r> %r"%(msg_id, rvalue, key, evalue))
|
|
|
elif evalue and not rvalue:
|
|
|
record[key] = evalue
|
|
|
try:
|
|
|
self.db.update_record(msg_id, record)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error updating record %r"%msg_id, exc_info=True)
|
|
|
except KeyError:
|
|
|
try:
|
|
|
self.db.add_record(msg_id, record)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error adding record %r"%msg_id, exc_info=True)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error saving task request %r"%msg_id, exc_info=True)
|
|
|
|
|
|
def save_task_result(self, idents, msg):
|
|
|
"""save the result of a completed task."""
|
|
|
client_id = idents[0]
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg)
|
|
|
except Exception:
|
|
|
self.log.error("task::invalid task result message send to %r: %r"%(
|
|
|
client_id, msg), exc_info=True)
|
|
|
return
|
|
|
|
|
|
parent = msg['parent_header']
|
|
|
if not parent:
|
|
|
# print msg
|
|
|
self.log.warn("Task %r had no parent!"%msg)
|
|
|
return
|
|
|
msg_id = parent['msg_id']
|
|
|
if msg_id in self.unassigned:
|
|
|
self.unassigned.remove(msg_id)
|
|
|
|
|
|
header = msg['header']
|
|
|
engine_uuid = header.get('engine', None)
|
|
|
eid = self.by_ident.get(engine_uuid, None)
|
|
|
|
|
|
if msg_id in self.pending:
|
|
|
self.pending.remove(msg_id)
|
|
|
self.all_completed.add(msg_id)
|
|
|
if eid is not None:
|
|
|
self.completed[eid].append(msg_id)
|
|
|
if msg_id in self.tasks[eid]:
|
|
|
self.tasks[eid].remove(msg_id)
|
|
|
completed = header['date']
|
|
|
started = header.get('started', None)
|
|
|
result = {
|
|
|
'result_header' : header,
|
|
|
'result_content': msg['content'],
|
|
|
'started' : started,
|
|
|
'completed' : completed,
|
|
|
'engine_uuid': engine_uuid
|
|
|
}
|
|
|
|
|
|
result['result_buffers'] = msg['buffers']
|
|
|
try:
|
|
|
self.db.update_record(msg_id, result)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error saving task request %r"%msg_id, exc_info=True)
|
|
|
|
|
|
else:
|
|
|
self.log.debug("task::unknown task %r finished"%msg_id)
|
|
|
|
|
|
def save_task_destination(self, idents, msg):
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg, content=True)
|
|
|
except Exception:
|
|
|
self.log.error("task::invalid task tracking message", exc_info=True)
|
|
|
return
|
|
|
content = msg['content']
|
|
|
# print (content)
|
|
|
msg_id = content['msg_id']
|
|
|
engine_uuid = content['engine_id']
|
|
|
eid = self.by_ident[util.asbytes(engine_uuid)]
|
|
|
|
|
|
self.log.info("task::task %r arrived on %r"%(msg_id, eid))
|
|
|
if msg_id in self.unassigned:
|
|
|
self.unassigned.remove(msg_id)
|
|
|
# else:
|
|
|
# self.log.debug("task::task %r not listed as MIA?!"%(msg_id))
|
|
|
|
|
|
self.tasks[eid].append(msg_id)
|
|
|
# self.pending[msg_id][1].update(received=datetime.now(),engine=(eid,engine_uuid))
|
|
|
try:
|
|
|
self.db.update_record(msg_id, dict(engine_uuid=engine_uuid))
|
|
|
except Exception:
|
|
|
self.log.error("DB Error saving task destination %r"%msg_id, exc_info=True)
|
|
|
|
|
|
|
|
|
def mia_task_request(self, idents, msg):
|
|
|
raise NotImplementedError
|
|
|
client_id = idents[0]
|
|
|
# content = dict(mia=self.mia,status='ok')
|
|
|
# self.session.send('mia_reply', content=content, idents=client_id)
|
|
|
|
|
|
|
|
|
#--------------------- IOPub Traffic ------------------------------
|
|
|
|
|
|
def save_iopub_message(self, topics, msg):
|
|
|
"""save an iopub message into the db"""
|
|
|
# print (topics)
|
|
|
try:
|
|
|
msg = self.session.unserialize(msg, content=True)
|
|
|
except Exception:
|
|
|
self.log.error("iopub::invalid IOPub message", exc_info=True)
|
|
|
return
|
|
|
|
|
|
parent = msg['parent_header']
|
|
|
if not parent:
|
|
|
self.log.error("iopub::invalid IOPub message: %r"%msg)
|
|
|
return
|
|
|
msg_id = parent['msg_id']
|
|
|
msg_type = msg['header']['msg_type']
|
|
|
content = msg['content']
|
|
|
|
|
|
# ensure msg_id is in db
|
|
|
try:
|
|
|
rec = self.db.get_record(msg_id)
|
|
|
except KeyError:
|
|
|
rec = empty_record()
|
|
|
rec['msg_id'] = msg_id
|
|
|
self.db.add_record(msg_id, rec)
|
|
|
# stream
|
|
|
d = {}
|
|
|
if msg_type == 'stream':
|
|
|
name = content['name']
|
|
|
s = rec[name] or ''
|
|
|
d[name] = s + content['data']
|
|
|
|
|
|
elif msg_type == 'pyerr':
|
|
|
d['pyerr'] = content
|
|
|
elif msg_type == 'pyin':
|
|
|
d['pyin'] = content['code']
|
|
|
else:
|
|
|
d[msg_type] = content.get('data', '')
|
|
|
|
|
|
try:
|
|
|
self.db.update_record(msg_id, d)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error saving iopub message %r"%msg_id, exc_info=True)
|
|
|
|
|
|
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Registration requests
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def connection_request(self, client_id, msg):
|
|
|
"""Reply with connection addresses for clients."""
|
|
|
self.log.info("client::client %r connected"%client_id)
|
|
|
content = dict(status='ok')
|
|
|
content.update(self.client_info)
|
|
|
jsonable = {}
|
|
|
for k,v in self.keytable.iteritems():
|
|
|
if v not in self.dead_engines:
|
|
|
jsonable[str(k)] = v.decode('ascii')
|
|
|
content['engines'] = jsonable
|
|
|
self.session.send(self.query, 'connection_reply', content, parent=msg, ident=client_id)
|
|
|
|
|
|
def register_engine(self, reg, msg):
|
|
|
"""Register a new engine."""
|
|
|
content = msg['content']
|
|
|
try:
|
|
|
queue = util.asbytes(content['queue'])
|
|
|
except KeyError:
|
|
|
self.log.error("registration::queue not specified", exc_info=True)
|
|
|
return
|
|
|
heart = content.get('heartbeat', None)
|
|
|
if heart:
|
|
|
heart = util.asbytes(heart)
|
|
|
"""register a new engine, and create the socket(s) necessary"""
|
|
|
eid = self._next_id
|
|
|
# print (eid, queue, reg, heart)
|
|
|
|
|
|
self.log.debug("registration::register_engine(%i, %r, %r, %r)"%(eid, queue, reg, heart))
|
|
|
|
|
|
content = dict(id=eid,status='ok')
|
|
|
content.update(self.engine_info)
|
|
|
# check if requesting available IDs:
|
|
|
if queue in self.by_ident:
|
|
|
try:
|
|
|
raise KeyError("queue_id %r in use"%queue)
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
self.log.error("queue_id %r in use"%queue, exc_info=True)
|
|
|
elif heart in self.hearts: # need to check unique hearts?
|
|
|
try:
|
|
|
raise KeyError("heart_id %r in use"%heart)
|
|
|
except:
|
|
|
self.log.error("heart_id %r in use"%heart, exc_info=True)
|
|
|
content = error.wrap_exception()
|
|
|
else:
|
|
|
for h, pack in self.incoming_registrations.iteritems():
|
|
|
if heart == h:
|
|
|
try:
|
|
|
raise KeyError("heart_id %r in use"%heart)
|
|
|
except:
|
|
|
self.log.error("heart_id %r in use"%heart, exc_info=True)
|
|
|
content = error.wrap_exception()
|
|
|
break
|
|
|
elif queue == pack[1]:
|
|
|
try:
|
|
|
raise KeyError("queue_id %r in use"%queue)
|
|
|
except:
|
|
|
self.log.error("queue_id %r in use"%queue, exc_info=True)
|
|
|
content = error.wrap_exception()
|
|
|
break
|
|
|
|
|
|
msg = self.session.send(self.query, "registration_reply",
|
|
|
content=content,
|
|
|
ident=reg)
|
|
|
|
|
|
if content['status'] == 'ok':
|
|
|
if heart in self.heartmonitor.hearts:
|
|
|
# already beating
|
|
|
self.incoming_registrations[heart] = (eid,queue,reg[0],None)
|
|
|
self.finish_registration(heart)
|
|
|
else:
|
|
|
purge = lambda : self._purge_stalled_registration(heart)
|
|
|
dc = ioloop.DelayedCallback(purge, self.registration_timeout, self.loop)
|
|
|
dc.start()
|
|
|
self.incoming_registrations[heart] = (eid,queue,reg[0],dc)
|
|
|
else:
|
|
|
self.log.error("registration::registration %i failed: %r"%(eid, content['evalue']))
|
|
|
return eid
|
|
|
|
|
|
def unregister_engine(self, ident, msg):
|
|
|
"""Unregister an engine that explicitly requested to leave."""
|
|
|
try:
|
|
|
eid = msg['content']['id']
|
|
|
except:
|
|
|
self.log.error("registration::bad engine id for unregistration: %r"%ident, exc_info=True)
|
|
|
return
|
|
|
self.log.info("registration::unregister_engine(%r)"%eid)
|
|
|
# print (eid)
|
|
|
uuid = self.keytable[eid]
|
|
|
content=dict(id=eid, queue=uuid.decode('ascii'))
|
|
|
self.dead_engines.add(uuid)
|
|
|
# self.ids.remove(eid)
|
|
|
# uuid = self.keytable.pop(eid)
|
|
|
#
|
|
|
# ec = self.engines.pop(eid)
|
|
|
# self.hearts.pop(ec.heartbeat)
|
|
|
# self.by_ident.pop(ec.queue)
|
|
|
# self.completed.pop(eid)
|
|
|
handleit = lambda : self._handle_stranded_msgs(eid, uuid)
|
|
|
dc = ioloop.DelayedCallback(handleit, self.registration_timeout, self.loop)
|
|
|
dc.start()
|
|
|
############## TODO: HANDLE IT ################
|
|
|
|
|
|
if self.notifier:
|
|
|
self.session.send(self.notifier, "unregistration_notification", content=content)
|
|
|
|
|
|
def _handle_stranded_msgs(self, eid, uuid):
|
|
|
"""Handle messages known to be on an engine when the engine unregisters.
|
|
|
|
|
|
It is possible that this will fire prematurely - that is, an engine will
|
|
|
go down after completing a result, and the client will be notified
|
|
|
that the result failed and later receive the actual result.
|
|
|
"""
|
|
|
|
|
|
outstanding = self.queues[eid]
|
|
|
|
|
|
for msg_id in outstanding:
|
|
|
self.pending.remove(msg_id)
|
|
|
self.all_completed.add(msg_id)
|
|
|
try:
|
|
|
raise error.EngineError("Engine %r died while running task %r"%(eid, msg_id))
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
# build a fake header:
|
|
|
header = {}
|
|
|
header['engine'] = uuid
|
|
|
header['date'] = datetime.now()
|
|
|
rec = dict(result_content=content, result_header=header, result_buffers=[])
|
|
|
rec['completed'] = header['date']
|
|
|
rec['engine_uuid'] = uuid
|
|
|
try:
|
|
|
self.db.update_record(msg_id, rec)
|
|
|
except Exception:
|
|
|
self.log.error("DB Error handling stranded msg %r"%msg_id, exc_info=True)
|
|
|
|
|
|
|
|
|
def finish_registration(self, heart):
|
|
|
"""Second half of engine registration, called after our HeartMonitor
|
|
|
has received a beat from the Engine's Heart."""
|
|
|
try:
|
|
|
(eid,queue,reg,purge) = self.incoming_registrations.pop(heart)
|
|
|
except KeyError:
|
|
|
self.log.error("registration::tried to finish nonexistant registration", exc_info=True)
|
|
|
return
|
|
|
self.log.info("registration::finished registering engine %i:%r"%(eid,queue))
|
|
|
if purge is not None:
|
|
|
purge.stop()
|
|
|
control = queue
|
|
|
self.ids.add(eid)
|
|
|
self.keytable[eid] = queue
|
|
|
self.engines[eid] = EngineConnector(id=eid, queue=queue, registration=reg,
|
|
|
control=control, heartbeat=heart)
|
|
|
self.by_ident[queue] = eid
|
|
|
self.queues[eid] = list()
|
|
|
self.tasks[eid] = list()
|
|
|
self.completed[eid] = list()
|
|
|
self.hearts[heart] = eid
|
|
|
content = dict(id=eid, queue=self.engines[eid].queue.decode('ascii'))
|
|
|
if self.notifier:
|
|
|
self.session.send(self.notifier, "registration_notification", content=content)
|
|
|
self.log.info("engine::Engine Connected: %i"%eid)
|
|
|
|
|
|
def _purge_stalled_registration(self, heart):
|
|
|
if heart in self.incoming_registrations:
|
|
|
eid = self.incoming_registrations.pop(heart)[0]
|
|
|
self.log.info("registration::purging stalled registration: %i"%eid)
|
|
|
else:
|
|
|
pass
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Client Requests
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def shutdown_request(self, client_id, msg):
|
|
|
"""handle shutdown request."""
|
|
|
self.session.send(self.query, 'shutdown_reply', content={'status': 'ok'}, ident=client_id)
|
|
|
# also notify other clients of shutdown
|
|
|
self.session.send(self.notifier, 'shutdown_notice', content={'status': 'ok'})
|
|
|
dc = ioloop.DelayedCallback(lambda : self._shutdown(), 1000, self.loop)
|
|
|
dc.start()
|
|
|
|
|
|
def _shutdown(self):
|
|
|
self.log.info("hub::hub shutting down.")
|
|
|
time.sleep(0.1)
|
|
|
sys.exit(0)
|
|
|
|
|
|
|
|
|
def check_load(self, client_id, msg):
|
|
|
content = msg['content']
|
|
|
try:
|
|
|
targets = content['targets']
|
|
|
targets = self._validate_targets(targets)
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
self.session.send(self.query, "hub_error",
|
|
|
content=content, ident=client_id)
|
|
|
return
|
|
|
|
|
|
content = dict(status='ok')
|
|
|
# loads = {}
|
|
|
for t in targets:
|
|
|
content[bytes(t)] = len(self.queues[t])+len(self.tasks[t])
|
|
|
self.session.send(self.query, "load_reply", content=content, ident=client_id)
|
|
|
|
|
|
|
|
|
def queue_status(self, client_id, msg):
|
|
|
"""Return the Queue status of one or more targets.
|
|
|
if verbose: return the msg_ids
|
|
|
else: return len of each type.
|
|
|
keys: queue (pending MUX jobs)
|
|
|
tasks (pending Task jobs)
|
|
|
completed (finished jobs from both queues)"""
|
|
|
content = msg['content']
|
|
|
targets = content['targets']
|
|
|
try:
|
|
|
targets = self._validate_targets(targets)
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
self.session.send(self.query, "hub_error",
|
|
|
content=content, ident=client_id)
|
|
|
return
|
|
|
verbose = content.get('verbose', False)
|
|
|
content = dict(status='ok')
|
|
|
for t in targets:
|
|
|
queue = self.queues[t]
|
|
|
completed = self.completed[t]
|
|
|
tasks = self.tasks[t]
|
|
|
if not verbose:
|
|
|
queue = len(queue)
|
|
|
completed = len(completed)
|
|
|
tasks = len(tasks)
|
|
|
content[str(t)] = {'queue': queue, 'completed': completed , 'tasks': tasks}
|
|
|
content['unassigned'] = list(self.unassigned) if verbose else len(self.unassigned)
|
|
|
# print (content)
|
|
|
self.session.send(self.query, "queue_reply", content=content, ident=client_id)
|
|
|
|
|
|
def purge_results(self, client_id, msg):
|
|
|
"""Purge results from memory. This method is more valuable before we move
|
|
|
to a DB based message storage mechanism."""
|
|
|
content = msg['content']
|
|
|
self.log.info("Dropping records with %s", content)
|
|
|
msg_ids = content.get('msg_ids', [])
|
|
|
reply = dict(status='ok')
|
|
|
if msg_ids == 'all':
|
|
|
try:
|
|
|
self.db.drop_matching_records(dict(completed={'$ne':None}))
|
|
|
except Exception:
|
|
|
reply = error.wrap_exception()
|
|
|
else:
|
|
|
pending = filter(lambda m: m in self.pending, msg_ids)
|
|
|
if pending:
|
|
|
try:
|
|
|
raise IndexError("msg pending: %r"%pending[0])
|
|
|
except:
|
|
|
reply = error.wrap_exception()
|
|
|
else:
|
|
|
try:
|
|
|
self.db.drop_matching_records(dict(msg_id={'$in':msg_ids}))
|
|
|
except Exception:
|
|
|
reply = error.wrap_exception()
|
|
|
|
|
|
if reply['status'] == 'ok':
|
|
|
eids = content.get('engine_ids', [])
|
|
|
for eid in eids:
|
|
|
if eid not in self.engines:
|
|
|
try:
|
|
|
raise IndexError("No such engine: %i"%eid)
|
|
|
except:
|
|
|
reply = error.wrap_exception()
|
|
|
break
|
|
|
uid = self.engines[eid].queue
|
|
|
try:
|
|
|
self.db.drop_matching_records(dict(engine_uuid=uid, completed={'$ne':None}))
|
|
|
except Exception:
|
|
|
reply = error.wrap_exception()
|
|
|
break
|
|
|
|
|
|
self.session.send(self.query, 'purge_reply', content=reply, ident=client_id)
|
|
|
|
|
|
def resubmit_task(self, client_id, msg):
|
|
|
"""Resubmit one or more tasks."""
|
|
|
def finish(reply):
|
|
|
self.session.send(self.query, 'resubmit_reply', content=reply, ident=client_id)
|
|
|
|
|
|
content = msg['content']
|
|
|
msg_ids = content['msg_ids']
|
|
|
reply = dict(status='ok')
|
|
|
try:
|
|
|
records = self.db.find_records({'msg_id' : {'$in' : msg_ids}}, keys=[
|
|
|
'header', 'content', 'buffers'])
|
|
|
except Exception:
|
|
|
self.log.error('db::db error finding tasks to resubmit', exc_info=True)
|
|
|
return finish(error.wrap_exception())
|
|
|
|
|
|
# validate msg_ids
|
|
|
found_ids = [ rec['msg_id'] for rec in records ]
|
|
|
invalid_ids = filter(lambda m: m in self.pending, found_ids)
|
|
|
if len(records) > len(msg_ids):
|
|
|
try:
|
|
|
raise RuntimeError("DB appears to be in an inconsistent state."
|
|
|
"More matching records were found than should exist")
|
|
|
except Exception:
|
|
|
return finish(error.wrap_exception())
|
|
|
elif len(records) < len(msg_ids):
|
|
|
missing = [ m for m in msg_ids if m not in found_ids ]
|
|
|
try:
|
|
|
raise KeyError("No such msg(s): %r"%missing)
|
|
|
except KeyError:
|
|
|
return finish(error.wrap_exception())
|
|
|
elif invalid_ids:
|
|
|
msg_id = invalid_ids[0]
|
|
|
try:
|
|
|
raise ValueError("Task %r appears to be inflight"%(msg_id))
|
|
|
except Exception:
|
|
|
return finish(error.wrap_exception())
|
|
|
|
|
|
# clear the existing records
|
|
|
now = datetime.now()
|
|
|
rec = empty_record()
|
|
|
map(rec.pop, ['msg_id', 'header', 'content', 'buffers', 'submitted'])
|
|
|
rec['resubmitted'] = now
|
|
|
rec['queue'] = 'task'
|
|
|
rec['client_uuid'] = client_id[0]
|
|
|
try:
|
|
|
for msg_id in msg_ids:
|
|
|
self.all_completed.discard(msg_id)
|
|
|
self.db.update_record(msg_id, rec)
|
|
|
except Exception:
|
|
|
self.log.error('db::db error upating record', exc_info=True)
|
|
|
reply = error.wrap_exception()
|
|
|
else:
|
|
|
# send the messages
|
|
|
for rec in records:
|
|
|
header = rec['header']
|
|
|
# include resubmitted in header to prevent digest collision
|
|
|
header['resubmitted'] = now
|
|
|
msg = self.session.msg(header['msg_type'])
|
|
|
msg['content'] = rec['content']
|
|
|
msg['header'] = header
|
|
|
msg['header']['msg_id'] = rec['msg_id']
|
|
|
self.session.send(self.resubmit, msg, buffers=rec['buffers'])
|
|
|
|
|
|
finish(dict(status='ok'))
|
|
|
|
|
|
|
|
|
def _extract_record(self, rec):
|
|
|
"""decompose a TaskRecord dict into subsection of reply for get_result"""
|
|
|
io_dict = {}
|
|
|
for key in 'pyin pyout pyerr stdout stderr'.split():
|
|
|
io_dict[key] = rec[key]
|
|
|
content = { 'result_content': rec['result_content'],
|
|
|
'header': rec['header'],
|
|
|
'result_header' : rec['result_header'],
|
|
|
'io' : io_dict,
|
|
|
}
|
|
|
if rec['result_buffers']:
|
|
|
buffers = map(bytes, rec['result_buffers'])
|
|
|
else:
|
|
|
buffers = []
|
|
|
|
|
|
return content, buffers
|
|
|
|
|
|
def get_results(self, client_id, msg):
|
|
|
"""Get the result of 1 or more messages."""
|
|
|
content = msg['content']
|
|
|
msg_ids = sorted(set(content['msg_ids']))
|
|
|
statusonly = content.get('status_only', False)
|
|
|
pending = []
|
|
|
completed = []
|
|
|
content = dict(status='ok')
|
|
|
content['pending'] = pending
|
|
|
content['completed'] = completed
|
|
|
buffers = []
|
|
|
if not statusonly:
|
|
|
try:
|
|
|
matches = self.db.find_records(dict(msg_id={'$in':msg_ids}))
|
|
|
# turn match list into dict, for faster lookup
|
|
|
records = {}
|
|
|
for rec in matches:
|
|
|
records[rec['msg_id']] = rec
|
|
|
except Exception:
|
|
|
content = error.wrap_exception()
|
|
|
self.session.send(self.query, "result_reply", content=content,
|
|
|
parent=msg, ident=client_id)
|
|
|
return
|
|
|
else:
|
|
|
records = {}
|
|
|
for msg_id in msg_ids:
|
|
|
if msg_id in self.pending:
|
|
|
pending.append(msg_id)
|
|
|
elif msg_id in self.all_completed:
|
|
|
completed.append(msg_id)
|
|
|
if not statusonly:
|
|
|
c,bufs = self._extract_record(records[msg_id])
|
|
|
content[msg_id] = c
|
|
|
buffers.extend(bufs)
|
|
|
elif msg_id in records:
|
|
|
if rec['completed']:
|
|
|
completed.append(msg_id)
|
|
|
c,bufs = self._extract_record(records[msg_id])
|
|
|
content[msg_id] = c
|
|
|
buffers.extend(bufs)
|
|
|
else:
|
|
|
pending.append(msg_id)
|
|
|
else:
|
|
|
try:
|
|
|
raise KeyError('No such message: '+msg_id)
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
break
|
|
|
self.session.send(self.query, "result_reply", content=content,
|
|
|
parent=msg, ident=client_id,
|
|
|
buffers=buffers)
|
|
|
|
|
|
def get_history(self, client_id, msg):
|
|
|
"""Get a list of all msg_ids in our DB records"""
|
|
|
try:
|
|
|
msg_ids = self.db.get_history()
|
|
|
except Exception as e:
|
|
|
content = error.wrap_exception()
|
|
|
else:
|
|
|
content = dict(status='ok', history=msg_ids)
|
|
|
|
|
|
self.session.send(self.query, "history_reply", content=content,
|
|
|
parent=msg, ident=client_id)
|
|
|
|
|
|
def db_query(self, client_id, msg):
|
|
|
"""Perform a raw query on the task record database."""
|
|
|
content = msg['content']
|
|
|
query = content.get('query', {})
|
|
|
keys = content.get('keys', None)
|
|
|
buffers = []
|
|
|
empty = list()
|
|
|
try:
|
|
|
records = self.db.find_records(query, keys)
|
|
|
except Exception as e:
|
|
|
content = error.wrap_exception()
|
|
|
else:
|
|
|
# extract buffers from reply content:
|
|
|
if keys is not None:
|
|
|
buffer_lens = [] if 'buffers' in keys else None
|
|
|
result_buffer_lens = [] if 'result_buffers' in keys else None
|
|
|
else:
|
|
|
buffer_lens = []
|
|
|
result_buffer_lens = []
|
|
|
|
|
|
for rec in records:
|
|
|
# buffers may be None, so double check
|
|
|
if buffer_lens is not None:
|
|
|
b = rec.pop('buffers', empty) or empty
|
|
|
buffer_lens.append(len(b))
|
|
|
buffers.extend(b)
|
|
|
if result_buffer_lens is not None:
|
|
|
rb = rec.pop('result_buffers', empty) or empty
|
|
|
result_buffer_lens.append(len(rb))
|
|
|
buffers.extend(rb)
|
|
|
content = dict(status='ok', records=records, buffer_lens=buffer_lens,
|
|
|
result_buffer_lens=result_buffer_lens)
|
|
|
# self.log.debug (content)
|
|
|
self.session.send(self.query, "db_reply", content=content,
|
|
|
parent=msg, ident=client_id,
|
|
|
buffers=buffers)
|
|
|
|
|
|
|
