2 # NEPI, a framework to manage network experiments
3 # Copyright (C) 2013 INRIA
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
20 from nepi.util.timefuncs import tnow, tdiff, tdiffsec, stabsformat
21 from nepi.util.logger import Logger
22 from nepi.execution.attribute import Attribute, Flags, Types
23 from nepi.execution.trace import TraceAttr
34 reschedule_delay = "1s"
37 """ Action that a user can order to a Resource Manager
45 """ State of a Resource Manager
58 ResourceState2str = dict({
59 ResourceState.NEW : "NEW",
60 ResourceState.DISCOVERED : "DISCOVERED",
61 ResourceState.PROVISIONED : "PROVISIONED",
62 ResourceState.READY : "READY",
63 ResourceState.STARTED : "STARTED",
64 ResourceState.STOPPED : "STOPPED",
65 ResourceState.FINISHED : "FINISHED",
66 ResourceState.FAILED : "FAILED",
67 ResourceState.RELEASED : "RELEASED",
71 """ Initializes template information (i.e. attributes and traces)
72 on classes derived from the ResourceManager class.
74 It is used as a decorator in the class declaration as follows:
77 class MyResourceManager(ResourceManager):
86 def clsinit_copy(cls):
87 """ Initializes template information (i.e. attributes and traces)
88 on classes direved from the ResourceManager class.
89 It differs from the clsinit method in that it forces inheritance
90 of attributes and traces from the parent class.
92 It is used as a decorator in the class declaration as follows:
95 class MyResourceManager(ResourceManager):
100 clsinit_copy should be prefered to clsinit when creating new
101 ResourceManager child classes.
109 """ Decorator function for instance methods that should set the
110 RM state to FAILED when an error is raised. The methods that must be
111 decorated are: discover, provision, deploy, start, stop and finish.
114 def wrapped(self, *args, **kwargs):
116 return func(self, *args, **kwargs)
119 err = traceback.format_exc()
121 self.debug("SETTING guid %d to state FAILED" % self.guid)
128 class ResourceManager(Logger):
129 """ Base clase for all ResourceManagers.
131 A ResourceManger is specific to a resource type (e.g. Node,
132 Switch, Application, etc) on a specific backend (e.g. PlanetLab,
135 The ResourceManager instances are responsible for interacting with
136 and controlling concrete (physical or virtual) resources in the
137 experimental backends.
147 def _register_attribute(cls, attr):
148 """ Resource subclasses will invoke this method to add a
153 cls._attributes[attr.name] = attr
156 def _remove_attribute(cls, name):
157 """ Resource subclasses will invoke this method to remove a
162 del cls._attributes[name]
165 def _register_trace(cls, trace):
166 """ Resource subclasses will invoke this method to add a
171 cls._traces[trace.name] = trace
174 def _remove_trace(cls, name):
175 """ Resource subclasses will invoke this method to remove a
180 del cls._traces[name]
183 def _register_attributes(cls):
184 """ Resource subclasses will invoke this method to register
187 This method should be overriden in the RMs that define
192 critical = Attribute("critical",
193 "Defines whether the resource is critical. "
194 "A failure on a critical resource will interrupt "
198 flags = Flags.ExecReadOnly)
200 cls._register_attribute(critical)
203 def _register_traces(cls):
204 """ Resource subclasses will invoke this method to register
207 This method should be overriden in the RMs that define traces.
215 """ ResourceManager classes have different attributes and traces.
216 Attribute and traces are stored in 'class attribute' dictionaries.
217 When a new ResourceManager class is created, the _clsinit method is
218 called to create a new instance of those dictionaries and initialize
221 The _clsinit method is called by the clsinit decorator method.
225 # static template for resource attributes
226 cls._attributes = dict()
227 cls._register_attributes()
229 # static template for resource traces
231 cls._register_traces()
234 def _clsinit_copy(cls):
235 """ Same as _clsinit, except that after creating new instances of the
236 dictionaries it copies all the attributes and traces from the parent
239 The _clsinit_copy method is called by the clsinit_copy decorator method.
242 # static template for resource attributes
243 cls._attributes = copy.deepcopy(cls._attributes)
244 cls._register_attributes()
246 # static template for resource traces
247 cls._traces = copy.deepcopy(cls._traces)
248 cls._register_traces()
252 """ Returns the type of the Resource Manager
258 def get_attributes(cls):
259 """ Returns a copy of the attributes
262 return copy.deepcopy(cls._attributes.values())
266 """ Returns a copy of the traces
269 return copy.deepcopy(cls._traces.values())
273 """ Returns the description of the type of Resource
279 def get_backend(cls):
280 """ Returns the identified of the backend (i.e. testbed, environment)
286 def __init__(self, ec, guid):
287 super(ResourceManager, self).__init__(self.get_rtype())
290 self._ec = weakref.ref(ec)
291 self._connections = set()
292 self._conditions = dict()
294 # the resource instance gets a copy of all attributes
295 self._attrs = copy.deepcopy(self._attributes)
297 # the resource instance gets a copy of all traces
298 self._trcs = copy.deepcopy(self._traces)
300 # Each resource is placed on a deployment group by the EC
302 self.deployment_group = None
304 self._start_time = None
305 self._stop_time = None
306 self._discover_time = None
307 self._provision_time = None
308 self._ready_time = None
309 self._release_time = None
310 self._finish_time = None
311 self._failed_time = None
313 self._state = ResourceState.NEW
315 # instance lock to synchronize exclusive state change methods (such
316 # as deploy and release methods), in order to prevent them from being
317 # executed at the same time
318 self._release_lock = threading.Lock()
322 """ Returns the global unique identifier of the RM """
327 """ Returns the Experiment Controller of the RM """
331 def connections(self):
332 """ Returns the set of guids of connected RMs """
333 return self._connections
336 def conditions(self):
337 """ Returns the conditions to which the RM is subjected to.
339 This method returns a dictionary of conditions lists indexed by
343 return self._conditions
346 def start_time(self):
347 """ Returns the start time of the RM as a timestamp """
348 return self._start_time
352 """ Returns the stop time of the RM as a timestamp """
353 return self._stop_time
356 def discover_time(self):
357 """ Returns the discover time of the RM as a timestamp """
358 return self._discover_time
361 def provision_time(self):
362 """ Returns the provision time of the RM as a timestamp """
363 return self._provision_time
366 def ready_time(self):
367 """ Returns the deployment time of the RM as a timestamp """
368 return self._ready_time
371 def release_time(self):
372 """ Returns the release time of the RM as a timestamp """
373 return self._release_time
376 def finish_time(self):
377 """ Returns the finalization time of the RM as a timestamp """
378 return self._finish_time
381 def failed_time(self):
382 """ Returns the time failure occured for the RM as a timestamp """
383 return self._failed_time
387 """ Get the current state of the RM """
390 def log_message(self, msg):
391 """ Returns the log message formatted with added information.
393 :param msg: text message
398 return " %s guid: %d - %s " % (self._rtype, self.guid, msg)
400 def register_connection(self, guid):
401 """ Registers a connection to the RM identified by guid
403 This method should not be overriden. Specific functionality
404 should be added in the do_connect method.
406 :param guid: Global unique identified of the RM to connect to
410 if self.valid_connection(guid):
411 self.do_connect(guid)
412 self._connections.add(guid)
414 def unregister_connection(self, guid):
415 """ Removes a registered connection to the RM identified by guid
417 This method should not be overriden. Specific functionality
418 should be added in the do_disconnect method.
420 :param guid: Global unique identified of the RM to connect to
424 if guid in self._connections:
425 self.do_disconnect(guid)
426 self._connections.remove(guid)
430 """ Performs resource discovery.
432 This method is responsible for selecting an individual resource
433 matching user requirements.
435 This method should not be overriden directly. Specific functionality
436 should be added in the do_discover method.
439 with self._release_lock:
440 if self._state != ResourceState.RELEASED:
445 """ Performs resource provisioning.
447 This method is responsible for provisioning one resource.
448 After this method has been successfully invoked, the resource
449 should be accessible/controllable by the RM.
451 This method should not be overriden directly. Specific functionality
452 should be added in the do_provision method.
455 with self._release_lock:
456 if self._state != ResourceState.RELEASED:
461 """ Starts the RM (e.g. launch remote process).
463 There is no standard start behavior. Some RMs will not need to perform
464 any actions upon start.
466 This method should not be overriden directly. Specific functionality
467 should be added in the do_start method.
471 if not self.state in [ResourceState.READY, ResourceState.STOPPED]:
472 self.error("Wrong state %s for start" % self.state)
475 with self._release_lock:
476 if self._state != ResourceState.RELEASED:
481 """ Interrupts the RM, stopping any tasks the RM was performing.
483 There is no standard stop behavior. Some RMs will not need to perform
484 any actions upon stop.
486 This method should not be overriden directly. Specific functionality
487 should be added in the do_stop method.
490 if not self.state in [ResourceState.STARTED]:
491 self.error("Wrong state %s for stop" % self.state)
494 with self._release_lock:
499 """ Execute all steps required for the RM to reach the state READY.
501 This method is responsible for deploying the resource (and invoking
502 the discover and provision methods).
504 This method should not be overriden directly. Specific functionality
505 should be added in the do_deploy method.
508 if self.state > ResourceState.READY:
509 self.error("Wrong state %s for deploy" % self.state)
512 with self._release_lock:
513 if self._state != ResourceState.RELEASED:
515 self.debug("----- READY ---- ")
518 """ Perform actions to free resources used by the RM.
520 This method is responsible for releasing resources that were
521 used during the experiment by the RM.
523 This method should not be overriden directly. Specific functionality
524 should be added in the do_release method.
527 with self._release_lock:
532 err = traceback.format_exc()
536 self.debug("----- RELEASED ---- ")
540 """ Sets the RM to state FINISHED.
542 The FINISHED state is different from STOPPED state in that it
543 should not be directly invoked by the user.
544 STOPPED indicates that the user interrupted the RM, FINISHED means
545 that the RM concluded normally the actions it was supposed to perform.
547 This method should not be overriden directly. Specific functionality
548 should be added in the do_finish method.
551 with self._release_lock:
552 if self._state != ResourceState.RELEASED:
556 """ Sets the RM to state FAILED.
558 This method should not be overriden directly. Specific functionality
559 should be added in the do_fail method.
562 with self._release_lock:
563 if self._state != ResourceState.RELEASED:
566 def set(self, name, value):
567 """ Set the value of the attribute
569 :param name: Name of the attribute
571 :param name: Value of the attribute
574 attr = self._attrs[name]
578 """ Returns the value of the attribute
580 :param name: Name of the attribute
584 attr = self._attrs[name]
587 def enable_trace(self, name):
588 """ Explicitly enable trace generation
590 :param name: Name of the trace
593 trace = self._trcs[name]
596 def trace_enabled(self, name):
597 """Returns True if trace is enables
599 :param name: Name of the trace
602 trace = self._trcs[name]
605 def trace(self, name, attr = TraceAttr.ALL, block = 512, offset = 0):
606 """ Get information on collected trace
608 :param name: Name of the trace
611 :param attr: Can be one of:
612 - TraceAttr.ALL (complete trace content),
613 - TraceAttr.STREAM (block in bytes to read starting at offset),
614 - TraceAttr.PATH (full path to the trace file),
615 - TraceAttr.SIZE (size of trace file).
618 :param block: Number of bytes to retrieve from trace, when attr is TraceAttr.STREAM
621 :param offset: Number of 'blocks' to skip, when attr is TraceAttr.STREAM
628 def register_condition(self, action, group, state, time = None):
629 """ Registers a condition on the resource manager to allow execution
630 of 'action' only after 'time' has elapsed from the moment all resources
631 in 'group' reached state 'state'
633 :param action: Action to restrict to condition (either 'START' or 'STOP')
635 :param group: Group of RMs to wait for (list of guids)
636 :type group: int or list of int
637 :param state: State to wait for on all RM in group. (either 'STARTED', 'STOPPED' or 'READY')
639 :param time: Time to wait after 'state' is reached on all RMs in group. (e.g. '2s')
644 if not action in self.conditions:
645 self._conditions[action] = list()
647 conditions = self.conditions.get(action)
649 # For each condition to register a tuple of (group, state, time) is
650 # added to the 'action' list
651 if not isinstance(group, list):
654 conditions.append((group, state, time))
656 def unregister_condition(self, group, action = None):
657 """ Removed conditions for a certain group of guids
659 :param action: Action to restrict to condition (either 'START', 'STOP' or 'READY')
662 :param group: Group of RMs to wait for (list of guids)
663 :type group: int or list of int
666 # For each condition a tuple of (group, state, time) is
667 # added to the 'action' list
668 if not isinstance(group, list):
671 for act, conditions in self.conditions.iteritems():
672 if action and act != action:
675 for condition in list(conditions):
676 (grp, state, time) = condition
678 # If there is an intersection between grp and group,
679 # then remove intersected elements
680 intsec = set(group).intersection(set(grp))
682 idx = conditions.index(condition)
684 newgrp.difference_update(intsec)
685 conditions[idx] = (newgrp, state, time)
687 def get_connected(self, rtype = None):
688 """ Returns the list of RM with the type 'rtype'
690 :param rtype: Type of the RM we look for
692 :return: list of guid
695 rclass = ResourceFactory.get_resource_type(rtype)
696 for guid in self.connections:
697 rm = self.ec.get_resource(guid)
698 if not rtype or isinstance(rm, rclass):
703 def _needs_reschedule(self, group, state, time):
704 """ Internal method that verify if 'time' has elapsed since
705 all elements in 'group' have reached state 'state'.
707 :param group: Group of RMs to wait for (list of guids)
708 :type group: int or list of int
709 :param state: State to wait for on all RM in group. (either 'STARTED', 'STOPPED' or 'READY')
711 :param time: Time to wait after 'state' is reached on all RMs in group. (e.g. '2s')
714 .. note : time should be written like "2s" or "3m" with s for seconds, m for minutes, h for hours, ...
715 If for example, you need to wait 2min 30sec, time could be "150s" or "2.5m".
716 For the moment, 2m30s is not a correct syntax.
720 delay = reschedule_delay
722 # check state and time elapsed on all RMs
724 rm = self.ec.get_resource(guid)
726 # If one of the RMs this resource needs to wait for has FAILED
727 # we raise an exception
728 if rm.state == ResourceState.FAILED:
729 msg = "Resource can not wait for FAILED RM %d. Setting Resource to FAILED"
730 raise RuntimeError, msg
732 # If the RM state is lower than the requested state we must
733 # reschedule (e.g. if RM is READY but we required STARTED).
738 # If there is a time restriction, we must verify the
739 # restriction is satisfied
741 if state == ResourceState.DISCOVERED:
743 if state == ResourceState.PROVISIONED:
744 t = rm.provision_time
745 elif state == ResourceState.READY:
747 elif state == ResourceState.STARTED:
749 elif state == ResourceState.STOPPED:
751 elif state == ResourceState.FINISHED:
753 elif state == ResourceState.RELEASED:
758 # time already elapsed since RM changed state
759 waited = "%fs" % tdiffsec(tnow(), t)
762 wait = tdiffsec(stabsformat(time), stabsformat(waited))
769 return reschedule, delay
771 def set_with_conditions(self, name, value, group, state, time):
772 """ Set value 'value' on attribute with name 'name' when 'time'
773 has elapsed since all elements in 'group' have reached state
776 :param name: Name of the attribute to set
778 :param name: Value of the attribute to set
780 :param group: Group of RMs to wait for (list of guids)
781 :type group: int or list of int
782 :param state: State to wait for on all RM in group. (either 'STARTED', 'STOPPED' or 'READY')
784 :param time: Time to wait after 'state' is reached on all RMs in group. (e.g. '2s')
789 delay = reschedule_delay
791 ## evaluate if set conditions are met
793 # only can set with conditions after the RM is started
794 if self.state != ResourceState.STARTED:
797 reschedule, delay = self._needs_reschedule(group, state, time)
800 callback = functools.partial(self.set_with_conditions,
801 name, value, group, state, time)
802 self.ec.schedule(delay, callback)
804 self.set(name, value)
806 def start_with_conditions(self):
807 """ Starts RM when all the conditions in self.conditions for
808 action 'START' are satisfied.
811 #import pdb;pdb.set_trace()
814 delay = reschedule_delay
817 ## evaluate if conditions to start are met
821 # Can only start when RM is either STOPPED or READY
822 if self.state not in [ResourceState.STOPPED, ResourceState.READY]:
824 self.debug("---- RESCHEDULING START ---- state %s " % self.state )
826 start_conditions = self.conditions.get(ResourceAction.START, [])
828 self.debug("---- START CONDITIONS ---- %s" % start_conditions)
830 # Verify all start conditions are met
831 for (group, state, time) in start_conditions:
832 # Uncomment for debug
835 rm = self.ec.get_resource(guid)
836 unmet.append((guid, rm._state))
838 self.debug("---- WAITED STATES ---- %s" % unmet )
840 reschedule, delay = self._needs_reschedule(group, state, time)
845 self.ec.schedule(delay, self.start_with_conditions)
847 self.debug("----- STARTING ---- ")
850 def stop_with_conditions(self):
851 """ Stops RM when all the conditions in self.conditions for
852 action 'STOP' are satisfied.
856 delay = reschedule_delay
858 ## evaluate if conditions to stop are met
862 # only can stop when RM is STARTED
863 if self.state != ResourceState.STARTED:
865 self.debug("---- RESCHEDULING STOP ---- state %s " % self.state )
867 self.debug(" ---- STOP CONDITIONS ---- %s" %
868 self.conditions.get(ResourceAction.STOP))
870 stop_conditions = self.conditions.get(ResourceAction.STOP, [])
871 for (group, state, time) in stop_conditions:
872 reschedule, delay = self._needs_reschedule(group, state, time)
877 callback = functools.partial(self.stop_with_conditions)
878 self.ec.schedule(delay, callback)
880 self.debug(" ----- STOPPING ---- ")
883 def deploy_with_conditions(self):
884 """ Deploy RM when all the conditions in self.conditions for
885 action 'READY' are satisfied.
889 delay = reschedule_delay
891 ## evaluate if conditions to deploy are met
895 # only can deploy when RM is either NEW, DISCOVERED or PROVISIONED
896 if self.state not in [ResourceState.NEW, ResourceState.DISCOVERED,
897 ResourceState.PROVISIONED]:
899 self.debug("---- RESCHEDULING DEPLOY ---- state %s " % self.state )
901 deploy_conditions = self.conditions.get(ResourceAction.DEPLOY, [])
903 self.debug("---- DEPLOY CONDITIONS ---- %s" % deploy_conditions)
905 # Verify all start conditions are met
906 for (group, state, time) in deploy_conditions:
907 # Uncomment for debug
910 # rm = self.ec.get_resource(guid)
911 # unmet.append((guid, rm._state))
913 #self.debug("---- WAITED STATES ---- %s" % unmet )
915 reschedule, delay = self._needs_reschedule(group, state, time)
920 self.ec.schedule(delay, self.deploy_with_conditions)
922 self.debug("----- DEPLOYING ---- ")
925 def do_connect(self, guid):
926 """ Performs actions that need to be taken upon associating RMs.
927 This method should be redefined when necessary in child classes.
931 def do_disconnect(self, guid):
932 """ Performs actions that need to be taken upon disassociating RMs.
933 This method should be redefined when necessary in child classes.
937 def valid_connection(self, guid):
938 """Checks whether a connection with the other RM
940 This method need to be redefined by each new Resource Manager.
942 :param guid: Guid of the current Resource Manager
950 def do_discover(self):
951 self.set_discovered()
953 def do_provision(self):
954 self.set_provisioned()
965 def do_release(self):
969 # In case the RM passed from STARTED directly to FINISHED,
970 # we set the stop_time for consistency
971 if self.stop_time == None:
979 def set_started(self):
980 """ Mark ResourceManager as STARTED """
981 self.set_state(ResourceState.STARTED, "_start_time")
983 def set_stopped(self):
984 """ Mark ResourceManager as STOPPED """
985 self.set_state(ResourceState.STOPPED, "_stop_time")
988 """ Mark ResourceManager as READY """
989 self.set_state(ResourceState.READY, "_ready_time")
991 def set_released(self):
992 """ Mark ResourceManager as REALEASED """
993 self.set_state(ResourceState.RELEASED, "_release_time")
995 def set_finished(self):
996 """ Mark ResourceManager as FINISHED """
997 self.set_state(ResourceState.FINISHED, "_finish_time")
999 def set_failed(self):
1000 """ Mark ResourceManager as FAILED """
1001 self.set_state(ResourceState.FAILED, "_failed_time")
1003 def set_discovered(self):
1004 """ Mark ResourceManager as DISCOVERED """
1005 self.set_state(ResourceState.DISCOVERED, "_discover_time")
1007 def set_provisioned(self):
1008 """ Mark ResourceManager as PROVISIONED """
1009 self.set_state(ResourceState.PROVISIONED, "_provision_time")
1011 def set_state(self, state, state_time_attr):
1012 # Ensure that RM state will not change after released
1013 if self._state == ResourceState.RELEASED:
1016 setattr(self, state_time_attr, tnow())
1019 class ResourceFactory(object):
1020 _resource_types = dict()
1023 def resource_types(cls):
1024 """Return the type of the Class"""
1025 return cls._resource_types
1028 def get_resource_type(cls, rtype):
1029 """Return the type of the Class"""
1030 return cls._resource_types.get(rtype)
1033 def register_type(cls, rclass):
1034 """Register a new Ressource Manager"""
1035 cls._resource_types[rclass.get_rtype()] = rclass
1038 def create(cls, rtype, ec, guid):
1039 """Create a new instance of a Ressource Manager"""
1040 rclass = cls._resource_types[rtype]
1041 return rclass(ec, guid)
1043 def populate_factory():
1044 """Register all the possible RM that exists in the current version of Nepi.
1046 # Once the factory is populated, don't repopulate
1047 if not ResourceFactory.resource_types():
1048 for rclass in find_types():
1049 ResourceFactory.register_type(rclass)
1052 """Look into the different folders to find all the
1053 availables Resources Managers
1055 search_path = os.environ.get("NEPI_SEARCH_PATH", "")
1056 search_path = set(search_path.split(" "))
1059 import nepi.resources
1060 path = os.path.dirname(nepi.resources.__file__)
1061 search_path.add(path)
1065 for importer, modname, ispkg in pkgutil.walk_packages(search_path,
1066 prefix = "nepi.resources."):
1068 loader = importer.find_module(modname)
1071 # Notice: Repeated calls to load_module will act as a reload of teh module
1072 if modname in sys.modules:
1073 module = sys.modules.get(modname)
1075 module = loader.load_module(modname)
1077 for attrname in dir(module):
1078 if attrname.startswith("_"):
1081 attr = getattr(module, attrname)
1083 if attr == ResourceManager:
1086 if not inspect.isclass(attr):
1089 if issubclass(attr, ResourceManager):
1092 if not modname in sys.modules:
1093 sys.modules[modname] = module
1098 err = traceback.format_exc()
1099 logger = logging.getLogger("Resource.find_types()")
1100 logger.error("Error while loading Resource Managers %s" % err)