import logging
import os
import sys
-import threading
import time
-import weakref
+import threading
-from neco.execution import scheduler, tasks
from neco.util import guid
-from neco.util.timefuncs import strfnow, strfdiff, strfvalid
from neco.util.parallel import ParallelRun
+from neco.util.timefuncs import strfnow, strfdiff, strfvalid
+from neco.execution.resource import ResourceFactory, ResourceAction, \
+ ResourceState
+from neco.execution.scheduler import HeapScheduler, Task, TaskStatus
+from neco.execution.trace import TraceAttr
-_reschedule_delay = "0.1s"
+# TODO: use multiprocessing instead of threading
class ExperimentController(object):
- def __init__(self, root_dir = "/tmp", loglevel = 'error'):
+ def __init__(self, exp_id = None, root_dir = "/tmp"):
super(ExperimentController, self).__init__()
# root directory to store files
self._root_dir = root_dir
+ # experiment identifier given by the user
+ self._exp_id = exp_id or "nepi-exp-%s" % os.urandom(8).encode('hex')
+
# generator of globally unique ids
self._guid_generator = guid.GuidGenerator()
+ # Resource managers
+ self._resources = dict()
+
+ # Resource managers
+ self._group = dict()
+
# Scheduler
- self._scheduler = scheduler.HeapScheduler()
+ self._scheduler = HeapScheduler()
# Tasks
self._tasks = dict()
-
- # Resources
- self._resources = dict()
-
+
# Event processing thread
- self._cond = threading.Condition()
self._stop = False
- self._thread = threading.Thread(target = self._process_tasks)
+ self._cond = threading.Condition()
+ self._thread = threading.Thread(target = self._process)
self._thread.start()
-
+
# Logging
self._logger = logging.getLogger("neco.execution.ec")
- self._logger.setLevel(getattr(logging, loglevel.upper()))
- def resource(self, guid):
+ @property
+ def logger(self):
+ return self._logger
+
+ @property
+ def exp_id(self):
+ exp_id = self._exp_id
+ if not exp_id.startswith("nepi-"):
+ exp_id = "nepi-" + exp_id
+ return exp_id
+
+ def get_task(self, tid):
+ return self._tasks.get(tid)
+
+ def get_resource(self, guid):
return self._resources.get(guid)
- def terminate(self):
+ @property
+ def resources(self):
+ return self._resources.keys()
+
+ def register_resource(self, rtype, guid = None):
+ # Get next available guid
+ guid = self._guid_generator.next(guid)
+
+ # Instantiate RM
+ rm = ResourceFactory.create(rtype, self, guid)
+
+ # Store RM
+ self._resources[guid] = rm
+
+ return guid
+
+ def register_group(self, group):
+ guid = self._guid_generator.next()
+
+ if not isinstance(group, list):
+ group = [group]
+
+ self._groups[guid] = group
+
+ return guid
+
+ def get_attributes(self, guid):
+ rm = self.get_resource(guid)
+ return rm.get_attributes()
+
+ def get_filters(self, guid):
+ rm = self.get_resource(guid)
+ return rm.get_filters()
+
+ def register_connection(self, guid1, guid2):
+ rm1 = self.get_resource(guid1)
+ rm2 = self.get_resource(guid2)
+
+ rm1.connect(guid2)
+ rm2.connect(guid1)
+
+ def register_condition(self, group1, action, group2, state,
+ time = None):
+ """ Registers an action START or STOP for all RM on group1 to occur
+ time 'time' after all elements in group2 reached state 'state'.
+
+ :param group1: List of guids of RMs subjected to action
+ :type group1: list
+
+ :param action: Action to register (either START or STOP)
+ :type action: ResourceAction
+
+ :param group2: List of guids of RMs to we waited for
+ :type group2: list
+
+ :param state: State to wait for on RMs (STARTED, STOPPED, etc)
+ :type state: ResourceState
+
+ :param time: Time to wait after group2 has reached status
+ :type time: string
+
+ """
+ if isinstance(group1, int):
+ group1 = [group1]
+ if isinstance(group2, int):
+ group2 = [group2]
+
+ for guid1 in group1:
+ rm = self.get_resource(guid1)
+ rm.register_condition(action, group2, state, time)
+
+ def register_trace(self, guid, name):
+ """ Enable trace
+
+ :param name: Name of the trace
+ :type name: str
+ """
+ rm = self.get_resource(guid)
+ rm.register_trace(name)
+
+ def trace(self, guid, name, attr = TraceAttr.ALL, block = 512, offset = 0):
+ """ Get information on collected trace
+
+ :param name: Name of the trace
+ :type name: str
+
+ :param attr: Can be one of:
+ - TraceAttr.ALL (complete trace content),
+ - TraceAttr.STREAM (block in bytes to read starting at offset),
+ - TraceAttr.PATH (full path to the trace file),
+ - TraceAttr.SIZE (size of trace file).
+ :type attr: str
+
+ :param block: Number of bytes to retrieve from trace, when attr is TraceAttr.STREAM
+ :type name: int
+
+ :param offset: Number of 'blocks' to skip, when attr is TraceAttr.STREAM
+ :type name: int
+
+ :rtype: str
+ """
+ rm = self.get_resource(guid)
+ return rm.trace(name, attr, block, offset)
+
+ def discover(self, guid, filters):
+ rm = self.get_resource(guid)
+ return rm.discover(filters)
+
+ def provision(self, guid, filters):
+ rm = self.get_resource(guid)
+ return rm.provision(filters)
+
+ def get(self, guid, name):
+ rm = self.get_resource(guid)
+ return rm.get(name)
+
+ def set(self, guid, name, value):
+ rm = self.get_resource(guid)
+ return rm.set(name, value)
+
+ def state(self, guid):
+ rm = self.get_resource(guid)
+ return rm.state
+
+ def stop(self, guid):
+ rm = self.get_resource(guid)
+ return rm.stop()
+
+ def start(self, guid):
+ rm = self.get_resource(guid)
+ return rm.start()
+
+ def set_with_conditions(self, name, value, group1, group2, state,
+ time = None):
+ """ Set value 'value' on attribute with name 'name' on all RMs of
+ group1 when 'time' has elapsed since all elements in group2
+ have reached state 'state'.
+
+ :param name: Name of attribute to set in RM
+ :type name: string
+
+ :param value: Value of attribute to set in RM
+ :type name: string
+
+ :param group1: List of guids of RMs subjected to action
+ :type group1: list
+
+ :param action: Action to register (either START or STOP)
+ :type action: ResourceAction
+
+ :param group2: List of guids of RMs to we waited for
+ :type group2: list
+
+ :param state: State to wait for on RMs (STARTED, STOPPED, etc)
+ :type state: ResourceState
+
+ :param time: Time to wait after group2 has reached status
+ :type time: string
+
+ """
+ if isinstance(group1, int):
+ group1 = [group1]
+ if isinstance(group2, int):
+ group2 = [group2]
+
+ for guid1 in group1:
+ rm = self.get_resource(guid)
+ rm.set_with_conditions(name, value, group2, state, time)
+
+ def stop_with_conditions(self, guid):
+ rm = self.get_resource(guid)
+ return rm.stop_with_conditions()
+
+ def start_with_conditions(self, guid):
+ rm = self.get_resource(guid)
+ return rm.start_with_condition()
+
+ def deploy(self, group = None, wait_all_ready = True):
+ """ Deploy all resource manager in group
+
+ :param group: List of guids of RMs to deploy
+ :type group: list
+
+ :param wait_all_ready: Wait until all RMs are ready in
+ order to start the RMs
+ :type guid: int
+
+ """
+ self.logger.debug(" ------- DEPLOY START ------ ")
+
+ def steps(rm):
+ rm.deploy()
+ rm.start_with_conditions()
+
+ # Only if the RM has STOP consitions we
+ # schedule a stop. Otherwise the RM will stop immediately
+ if rm.conditions.get(ResourceAction.STOP):
+ rm.stop_with_conditions()
+
+ if not group:
+ group = self.resources
+
+ threads = []
+ for guid in group:
+ rm = self.get_resource(guid)
+
+ if wait_all_ready:
+ towait = list(group)
+ towait.remove(guid)
+ self.register_condition(guid, ResourceAction.START,
+ towait, ResourceState.READY)
+
+ thread = threading.Thread(target = steps, args = (rm,))
+ threads.append(thread)
+ thread.start()
+
+ for thread in threads:
+ thread.join()
+
+ def release(self, group = None):
+ if not group:
+ group = self.resources
+
+ threads = []
+ for guid in group:
+ rm = self.get_resource(guid)
+ thread = threading.Thread(target=rm.release)
+ threads.append(thread)
+ thread.start()
+
+ for thread in threads:
+ thread.join()
+
+ def shutdown(self):
+ self.release()
+
self._stop = True
self._cond.acquire()
self._cond.notify()
if self._thread.is_alive():
self._thread.join()
- def task_info(self, tid):
- task = self._tasks.get(tid)
- if not task:
- return (None, None)
- return (task.status, task.result)
+ def schedule(self, date, callback, track = False):
+ """ Schedule a callback to be executed at time date.
- def schedule(self, date, callback, args = None, kwargs = None):
- """
date string containing execution time for the task.
It can be expressed as an absolute time, using
timestamp format, or as a relative time matching
callback code to be executed for the task. Must be a
Python function, and receives args and kwargs
as arguments.
- The callback will always be invoked passing a
- week reference to the controller as first
- argument.
- The callback must return a (status, result)
- tuple where status is one of :
- task.TaskStatus.FAIL,
- task.TaskStatus.SUCCESS,
- task.TaskStatus.RETRY,
- task.TaskStatus.RECYCLE
+
+ track if set to True, the task will be retrivable with
+ the get_task() method
"""
timestamp = strfvalid(date)
- args = args or []
- kwargs = kwargs or {}
-
- task = tasks.Task(timestamp, callback, args, kwargs)
- task = self._schedule(task)
-
- self._tasks[task.id] = task
-
- return task.id
-
- ###########################################################################
- #### Internal methods
- ###########################################################################
-
- def _schedule(self, task):
+ task = Task(timestamp, callback)
task = self._scheduler.schedule(task)
+ if track:
+ self._tasks[task.id] = task
+
# Notify condition to wake up the processing thread
self._cond.acquire()
self._cond.notify()
self._cond.release()
- return task
+
+ return task.id
- def _process_tasks(self):
+ def _process(self):
runner = ParallelRun(maxthreads = 50)
runner.start()
self._cond.release()
else:
# Process tasks in parallel
- runner.put(self._execute_task, task)
+ runner.put(self._execute, task)
except:
import traceback
err = traceback.format_exc()
self._logger.error("Error while processing tasks in the EC: %s" % err)
-
- def _execute_task(self, task):
+
+ def _execute(self, task):
# Invoke callback
- ec = weakref.ref(self)
+ task.status = TaskStatus.DONE
+
try:
- (task.status, task.result) = task.callback(ec, *task.args, **task.kwargs)
+ task.result = task.callback()
except:
import traceback
err = traceback.format_exc()
self._logger.error("Error while executing event: %s" % err)
- # task marked as FAIL
- task.status = tasks.TaskStatus.FAIL
task.result = err
-
- if task.status == tasks.TaskStatus.RETRY:
- # Re-schedule same task in the near future
- task.timestamp = strfvalid(_reschedule_delay)
- self._schedule(task)
- elif task.status == tasks.TaskStatus.RECYCLE:
- # Re-schedule t in the future
- timestamp = strfvalid(task.result)
- self.schedule(timestamp, task.callback, task.args, task.kwargs)
+ task.status = TaskStatus.ERROR
git://git.onelab.eu / nepi.git / blobdiff