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Current File : /usr/lib/python3.6/site-packages/tuned/daemon/daemon.py
import os
import errno
import threading
import tuned.logs
from tuned.exceptions import TunedException
from tuned.profiles.exceptions import InvalidProfileException
import tuned.consts as consts
from tuned.utils.commands import commands
from tuned import exports
from tuned.utils.profile_recommender import ProfileRecommender
import re

log = tuned.logs.get()


class Daemon(object):
	def __init__(self, unit_manager, profile_loader, profile_names=None, config=None, application=None):
		log.debug("initializing daemon")
		self._daemon = consts.CFG_DEF_DAEMON
		self._sleep_interval = int(consts.CFG_DEF_SLEEP_INTERVAL)
		self._update_interval = int(consts.CFG_DEF_UPDATE_INTERVAL)
		self._dynamic_tuning = consts.CFG_DEF_DYNAMIC_TUNING
		self._recommend_command = True
		self._rollback = consts.CFG_DEF_ROLLBACK
		if config is not None:
			self._daemon = config.get_bool(consts.CFG_DAEMON, consts.CFG_DEF_DAEMON)
			self._sleep_interval = int(config.get(consts.CFG_SLEEP_INTERVAL, consts.CFG_DEF_SLEEP_INTERVAL))
			self._update_interval = int(config.get(consts.CFG_UPDATE_INTERVAL, consts.CFG_DEF_UPDATE_INTERVAL))
			self._dynamic_tuning = config.get_bool(consts.CFG_DYNAMIC_TUNING, consts.CFG_DEF_DYNAMIC_TUNING)
			self._recommend_command = config.get_bool(consts.CFG_RECOMMEND_COMMAND, consts.CFG_DEF_RECOMMEND_COMMAND)
			self._rollback = config.get(consts.CFG_ROLLBACK, consts.CFG_DEF_ROLLBACK)
		self._application = application
		if self._sleep_interval <= 0:
			self._sleep_interval = int(consts.CFG_DEF_SLEEP_INTERVAL)
		if self._update_interval == 0:
			self._dynamic_tuning = False
		elif self._update_interval < self._sleep_interval:
			self._update_interval = self._sleep_interval
		self._sleep_cycles = self._update_interval // self._sleep_interval
		log.info("using sleep interval of %d second(s)" % self._sleep_interval)
		if self._dynamic_tuning:
			log.info("dynamic tuning is enabled (can be overridden by plugins)")
			log.info("using update interval of %d second(s) (%d times of the sleep interval)" % (self._sleep_cycles * self._sleep_interval, self._sleep_cycles))

		self._profile_recommender = ProfileRecommender(is_hardcoded = not self._recommend_command)
		self._unit_manager = unit_manager
		self._profile_loader = profile_loader
		self._init_threads()
		self._cmd = commands()
		try:
			self._init_profile(profile_names)
		except TunedException as e:
			log.error("Cannot set initial profile. No tunings will be enabled: %s" % e)

	def _init_threads(self):
		self._thread = None
		self._terminate = threading.Event()
		# Flag which is set if terminating due to profile_switch
		self._terminate_profile_switch = threading.Event()
		# Flag which is set if there is no operation in progress
		self._not_used = threading.Event()
		# Flag which is set if SIGHUP is being processed
		self._sighup_processing = threading.Event()
		self._not_used.set()
		self._profile_applied = threading.Event()

	def reload_profile_config(self):
		"""Read configuration files again and load profile according to them"""
		self._init_profile(None)

	def _init_profile(self, profile_names):
		manual = True
		post_loaded_profile = self._cmd.get_post_loaded_profile()
		if profile_names is None:
			(profile_names, manual) = self._get_startup_profile()
			if profile_names is None:
				msg = "No profile is preset, running in manual mode. "
				if post_loaded_profile:
					msg += "Only post-loaded profile will be enabled"
				else:
					msg += "No profile will be enabled."
				log.info(msg)
		# Passed through '-p' cmdline option
		elif profile_names == "":
			if post_loaded_profile:
				log.info("Only post-loaded profile will be enabled")
			else:
				log.info("No profile will be enabled.")

		self._profile = None
		self._manual = None
		self._active_profiles = []
		self._post_loaded_profile = None
		self.set_all_profiles(profile_names, manual, post_loaded_profile)

	def _load_profiles(self, profile_names, manual):
		profile_names = profile_names or ""
		profile_list = profile_names.split()

		if self._post_loaded_profile:
			log.info("Using post-loaded profile '%s'"
				 % self._post_loaded_profile)
			profile_list = profile_list + [self._post_loaded_profile]
		for profile in profile_list:
			if profile not in self.profile_loader.profile_locator.get_known_names():
				errstr = "Requested profile '%s' doesn't exist." % profile
				self._notify_profile_changed(profile_names, False, errstr)
				raise TunedException(errstr)
		try:
			if profile_list:
				self._profile = self._profile_loader.load(profile_list)
			else:
				self._profile = None

			self._manual = manual
			self._active_profiles = profile_names.split()
		except InvalidProfileException as e:
			errstr = "Cannot load profile(s) '%s': %s" % (" ".join(profile_list), e)
			self._notify_profile_changed(profile_names, False, errstr)
			raise TunedException(errstr)

	def set_profile(self, profile_names, manual):
		if self.is_running():
			errstr = "Cannot set profile while the daemon is running."
			self._notify_profile_changed(profile_names, False,
						     errstr)
			raise TunedException(errstr)

		self._load_profiles(profile_names, manual)

	def _set_post_loaded_profile(self, profile_name):
		if not profile_name:
			self._post_loaded_profile = None
		elif len(profile_name.split()) > 1:
			errstr = "Whitespace is not allowed in profile names; only a single post-loaded profile is allowed."
			raise TunedException(errstr)
		else:
			self._post_loaded_profile = profile_name

	def set_all_profiles(self, active_profiles, manual, post_loaded_profile,
			     save_instantly=False):
		if self.is_running():
			errstr = "Cannot set profile while the daemon is running."
			self._notify_profile_changed(active_profiles, False,
						     errstr)
			raise TunedException(errstr)

		self._set_post_loaded_profile(post_loaded_profile)
		self._load_profiles(active_profiles, manual)

		if save_instantly:
			self._save_active_profile(active_profiles, manual)
			self._save_post_loaded_profile(post_loaded_profile)

	@property
	def profile(self):
		return self._profile

	@property
	def manual(self):
		return self._manual

	@property
	def post_loaded_profile(self):
		# Return the profile name only if the profile is active. If
		# the profile is not active, then the value is meaningless.
		return self._post_loaded_profile if self._profile else None

	@property
	def profile_recommender(self):
		return self._profile_recommender

	@property
	def profile_loader(self):
		return self._profile_loader

	# send notification when profile is changed (everything is setup) or if error occured
	# result: True - OK, False - error occured
	def _notify_profile_changed(self, profile_names, result, errstr):
		if self._application is not None:
			exports.send_signal(consts.SIGNAL_PROFILE_CHANGED, profile_names, result, errstr)
		return errstr

	def _full_rollback_required(self):
		retcode, out = self._cmd.execute(["systemctl", "is-system-running"], no_errors = [0])
		if retcode < 0:
			return False
		if out[:8] == "stopping":
			return False
		retcode, out = self._cmd.execute(["systemctl", "list-jobs"], no_errors = [0])
		return re.search(r"\b(shutdown|reboot|halt|poweroff)\.target.*start", out) is None and not retcode

	def _thread_code(self):
		if self._profile is None:
			raise TunedException("Cannot start the daemon without setting a profile.")

		self._unit_manager.create(self._profile.units)
		self._save_active_profile(" ".join(self._active_profiles),
					  self._manual)
		self._save_post_loaded_profile(self._post_loaded_profile)
		self._unit_manager.start_tuning()
		self._profile_applied.set()
		log.info("static tuning from profile '%s' applied" % self._profile.name)
		if self._daemon:
			exports.start()
		profile_names = " ".join(self._active_profiles)
		self._notify_profile_changed(profile_names, True, "OK")
		self._sighup_processing.clear()

		if self._daemon:
			# In python 2 interpreter with applied patch for rhbz#917709 we need to periodically
			# poll, otherwise the python will not have chance to update events / locks (due to GIL)
			# and e.g. DBus control will not work. The polling interval of 1 seconds (which is
			# the default) is still much better than 50 ms polling with unpatched interpreter.
			# For more details see TuneD rhbz#917587.
			_sleep_cnt = self._sleep_cycles
			while not self._cmd.wait(self._terminate, self._sleep_interval):
				if self._dynamic_tuning:
					_sleep_cnt -= 1
					if _sleep_cnt <= 0:
						_sleep_cnt = self._sleep_cycles
						log.debug("updating monitors")
						self._unit_manager.update_monitors()
						log.debug("performing tunings")
						self._unit_manager.update_tuning()

		self._profile_applied.clear()

		# wait for others to complete their tasks, use timeout 3 x sleep_interval to prevent
		# deadlocks
		i = 0
		while not self._cmd.wait(self._not_used, self._sleep_interval) and i < 3:
			i += 1

		# if terminating due to profile switch
		if self._terminate_profile_switch.is_set():
			rollback = consts.ROLLBACK_FULL
		else:
			# Assume only soft rollback is needed. Soft rollback means reverting all
			# non-persistent tunings applied by a plugin instance. In contrast to full
			# rollback, information about what to revert is kept in RAM (volatile
			# memory) -- TuneD data structures.
			# With systemd TuneD detects system shutdown and in such a case it doesn't
			# perform full cleanup. If the system is not shutting down, it means that TuneD
			# was explicitly stopped by the user and in such case do the full cleanup. On
			# systems without systemd, full cleanup is never performed.
			rollback = consts.ROLLBACK_SOFT
			if not self._full_rollback_required():
				log.info("terminating TuneD due to system shutdown / reboot")
			elif self._rollback == "not_on_exit":
				# no rollback on TuneD exit whatsoever
				rollback = consts.ROLLBACK_NONE
				log.info("terminating TuneD and not rolling back any changes due to '%s' option in '%s'" % (consts.CFG_ROLLBACK, consts.GLOBAL_CONFIG_FILE))
			else:
				if self._daemon:
					log.info("terminating TuneD, rolling back all changes")
					rollback = consts.ROLLBACK_FULL
				else:
					log.info("terminating TuneD in one-shot mode")
		if self._daemon:
			self._unit_manager.stop_tuning(rollback)
		self._unit_manager.destroy_all()

	def _save_active_profile(self, profile_names, manual):
		try:
			self._cmd.save_active_profile(profile_names, manual)
		except TunedException as e:
			log.error(str(e))

	def _save_post_loaded_profile(self, profile_name):
		try:
			self._cmd.save_post_loaded_profile(profile_name)
		except TunedException as e:
			log.error(str(e))

	def _get_recommended_profile(self):
		log.info("Running in automatic mode, checking what profile is recommended for your configuration.")
		profile = self._profile_recommender.recommend()
		log.info("Using '%s' profile" % profile)
		return profile

	def _get_startup_profile(self):
		profile, manual = self._cmd.get_active_profile()
		if manual is None:
			manual = profile is not None
		if not manual:
			profile = self._get_recommended_profile()
		return profile, manual

	def get_all_plugins(self):
		"""Return all accessible plugin classes"""
		return self._unit_manager.plugins_repository.load_all_plugins()

	def get_plugin_documentation(self, plugin_name):
		"""Return plugin class docstring"""
		try:
			plugin_class = self._unit_manager.plugins_repository.load_plugin(
				plugin_name
			)
		except ImportError:
			return ""
		return plugin_class.__doc__

	def get_plugin_hints(self, plugin_name):
		"""Return plugin's parameters and their hints

		Parameters:
		plugin_name -- plugins name

		Return:
		dictionary -- {parameter_name: hint}
		"""
		try:
			plugin_class = self._unit_manager.plugins_repository.load_plugin(
				plugin_name
			)
		except ImportError:
			return {}
		return plugin_class.get_config_options_hints()

	def is_enabled(self):
		return self._profile is not None

	def is_running(self):
		return self._thread is not None and self._thread.is_alive()

	def start(self):
		if self.is_running():
			return False

		if self._profile is None:
			return False

		log.info("starting tuning")
		self._not_used.set()
		self._thread = threading.Thread(target=self._thread_code)
		self._terminate_profile_switch.clear()
		self._terminate.clear()
		self._thread.start()
		return True

	def verify_profile(self, ignore_missing):
		if not self.is_running():
			log.error("TuneD is not running")
			return False

		if self._profile is None:
			log.error("no profile is set")
			return False

		if not self._profile_applied.is_set():
			log.error("profile is not applied")
			return False

		# using daemon, the main loop mustn't exit before our completion
		self._not_used.clear()
		log.info("verifying profile(s): %s" % self._profile.name)
		ret = self._unit_manager.verify_tuning(ignore_missing)
		# main loop is allowed to exit
		self._not_used.set()
		return ret

	# profile_switch is helper telling plugins whether the stop is due to profile switch
	def stop(self, profile_switch = False):
		if not self.is_running():
			return False
		log.info("stopping tuning")
		if profile_switch:
			self._terminate_profile_switch.set()
		self._terminate.set()
		self._thread.join()
		self._thread = None

		return True

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