import os
import sys
import time
+import threading
from neco.util import guid
-from neco.resources import ResourceFactory
+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
+
+# 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()
- # Groups of resources
- self._groups = dict()
-
+ # Resource managers
+ self._group = dict()
+
+ # Scheduler
+ self._scheduler = HeapScheduler()
+
+ # Tasks
+ self._tasks = dict()
+
+ # Event processing thread
+ self._stop = False
+ 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)
+ @property
def resources(self):
return self._resources.keys()
- def release(self, group = None):
- # TODO
- pass
-
- def deploy(self, group = None):
- # TODO
- pass
-
def register_resource(self, rtype, guid = None):
# Get next available guid
guid = self._guid_generator.next(guid)
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._resources[guid]
+ rm = self.get_resource(guid)
return rm.get_attributes()
def get_filters(self, guid):
- rm = self._resources[guid]
+ rm = self.get_resource(guid)
return rm.get_filters()
def register_connection(self, guid1, guid2):
- rm1 = self._resources[guid1]
- rm2 = self._resources[guid2]
+ rm1 = self.get_resource(guid1)
+ rm2 = self.get_resource(guid2)
rm1.connect(guid2)
rm2.connect(guid1)
- def register_group(self, guids, gguid = None):
- gguid = self._guid_generator.next(gguid)
- self._groups[gguid] = guids
+ 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'.
- def discover_resource(self, guid, filters):
- rm = self._resources[guid]
- return rm.discover(filters)
+ :param group1: List of guids of RMs subjected to action
+ :type group1: list
- def provision_resource(self, guid, filters):
- rm = self._resources[guid]
- return rm.provision(filters)
+ :param action: Action to register (either START or STOP)
+ :type action: ResourceAction
- def register_start(self, gguid1, time, after_status, gguid2):
- if isinstance(gguid1, int):
- gguid1 = list[gguid1]
- if isinstance(gguid2, int):
- gguid2 = list[gguid2]
-
- for guid1 in gguid1:
- for guid2 in gguid2:
- rm = self._resources(guid1)
- rm.start_after(time, after_status, guid2)
-
- def register_stop(self, gguid1, time, after_status, gguid2):
- if isinstance(gguid1, int):
- gguid1 = list[gguid1]
- if isinstance(gguid2, int):
- gguid2 = list[gguid2]
-
- for guid1 in gguid1:
- for guid2 in gguid2:
- rm = self._resources(guid1)
- rm.stop_after(time, after_status, guid2)
-
- def register_set(self, name, value, gguid1, time, after_status, gguid2):
- if isinstance(gguid1, int):
- gguid1 = list[gguid1]
+ :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):
- gguid2 = list[gguid2]
+ 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
- for guid1 in gguid1:
- for guid2 in gguid2:
- rm = self._resources(guid1)
- rm.set_after(name, value, time, after_status, guid2)
+ :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._resources(guid)
+ rm = self.get_resource(guid)
return rm.get(name)
def set(self, guid, name, value):
- rm = self._resources(guid)
+ rm = self.get_resource(guid)
return rm.set(name, value)
- def status(self, guid):
- rm = self._resources(guid)
- return rm.status()
+ def state(self, guid):
+ rm = self.get_resource(guid)
+ return rm.state
def stop(self, guid):
- rm = self._resources(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()
+ self._cond.release()
+ if self._thread.is_alive():
+ self._thread.join()
+
+ def schedule(self, date, callback, track = False):
+ """ Schedule a callback to be executed at time date.
+
+ 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
+ ^\d+.\d+(h|m|s|ms|us)$
+
+ callback code to be executed for the task. Must be a
+ Python function, and receives args and kwargs
+ as arguments.
+
+ track if set to True, the task will be retrivable with
+ the get_task() method
+ """
+ timestamp = strfvalid(date)
+
+ 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.id
+
+ def _process(self):
+ runner = ParallelRun(maxthreads = 50)
+ runner.start()
+
+ try:
+ while not self._stop:
+ self._cond.acquire()
+ task = self._scheduler.next()
+ self._cond.release()
+
+ if not task:
+ # It there are not tasks in the tasks queue we need to
+ # wait until a call to schedule wakes us up
+ self._cond.acquire()
+ self._cond.wait()
+ self._cond.release()
+ else:
+ # If the task timestamp is in the future the thread needs to wait
+ # until time elapse or until another task is scheduled
+ now = strfnow()
+ if now < task.timestamp:
+ # Calculate time difference in seconds
+ timeout = strfdiff(task.timestamp, now)
+ # Re-schedule task with the same timestamp
+ self._scheduler.schedule(task)
+ # Sleep until timeout or until a new task awakes the condition
+ self._cond.acquire()
+ self._cond.wait(timeout)
+ self._cond.release()
+ else:
+ # Process tasks in parallel
+ 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(self, task):
+ # Invoke callback
+ task.status = TaskStatus.DONE
+
+ try:
+ task.result = task.callback()
+ except:
+ import traceback
+ err = traceback.format_exc()
+ self._logger.error("Error while executing event: %s" % err)
+
+ task.result = err
+ task.status = TaskStatus.ERROR
+
git://git.onelab.eu / nepi.git / blobdiff