controller.py 4.66 KB
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from __future__ import print_function

import logging

logger = logging.getLogger('nrm')


class Action(object):

    """Information about a control action."""

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    def __init__(self, target, command, delta):
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        self.target = target
        self.command = command
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        self.delta = delta


class ApplicationActuator(object):

    """Actuator in charge of application thread control."""

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    def __init__(self, am, pubstream):
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        self.application_manager = am
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        self.pubstream = pubstream
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    def available_actions(self, target):
        ret = []
        for identity, application in \
                self.application_manager.applications.iteritems():
            if target in application.get_allowed_thread_requests():
                delta = application.get_thread_request_impact(target)
                ret.append(Action(application, target, delta))
        return ret
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    def execute(self, action):
        target_threads = action.target.threads
        update = {'type': 'application',
                  'command': 'threads',
                  'uuid': action.target.uuid,
                  'event': 'threads',
                  }
        if action.command == 'i':
            payload = target_threads['cur'] + 1
        elif action.command == 'd':
            payload = target_threads['cur'] - 1
        else:
            assert False, "impossible command"
        update['payload'] = payload
        self.pubstream.send_json(update)

    def update(self, action):
        action.target.do_thread_transition(action.command)


class PowerActuator(object):

    """Actuator in charge of power control."""

    def __init__(self, sm):
        self.sensor_manager = sm

    def available_actions(self, target):
        actions = []
        pl = self.sensor_manager.get_powerlimits()
        logger.info("power limits: %r:", pl)
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        if target == 'i':
            for k in pl:
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                r = range(int(pl[k]['curW'])+1, int(pl[k]['maxW']))
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                actions.extend([Action(k, s, s - r[0]) for s in r])
        elif target == 'd':
            for k in pl:
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                r = range(1, int(pl[k]['curW']))
                actions.extend([Action(k, s, r[-1] - s) for s in r])
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        return actions

    def execute(self, action):
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        logger.info("changing power limit: %r, %r", action.command,
                    action.delta)
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        self.sensor_manager.set_powerlimit(action.target, action.command)

    def update(self, action):
        pass

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class Controller(object):

    """Implements a control loop for resource management."""

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    def __init__(self, actuators):
        self.actuators = actuators
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    def planify(self, target, machineinfo):
        """Plan the next action for the control loop."""
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        try:
            total_power = machineinfo['energy']['power']['total']
        except TypeError:
            logging.error("\"machineinfo\" malformed. Can not run "
                          "control loop.")
            return (None, None)

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        direction = None
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        if total_power < target:
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            direction = 'i'
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        elif total_power > target:
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            direction = 'd'

        if direction:
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            actions = []
            for act in self.actuators:
                newactions = act.available_actions(direction)
                actions.extend([(a, act) for a in newactions])
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            if actions:
                # TODO: better choice
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                actions.sort(key=lambda x: x[0].delta)
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                return actions.pop(0)
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            else:
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                return (None, None)
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    def execute(self, action, actuator):
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        """Build the action for the appropriate manager."""
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        actuator.execute(action)
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    def update(self, action, actuator):
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        """Update tracking across the board to reflect the last action."""
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        actuator.update(action)
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    def run_policy(self, containers):
        """Run policies on containers with policies set."""
        for container in containers:
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            pp = containers[container].power
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            if pp['policy']:
                apps = self.actuators[0].application_manager.applications
                if apps:
                    app = next(apps[a] for a in apps if apps[a].container_uuid
                               == container)
                    ids = containers[container].resources['cpus']
                    # Run policy only if all phase contexts have been received
                    if not filter(lambda i: not app.phase_contexts[i]['set'],
                                  ids):
                        pp['manager'].run_policy(app.phase_contexts)
                        if filter(lambda i: app.phase_contexts[i]['set'], ids):
                            logger.debug("Phase context not reset %r", app)