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# ================================================================================
# Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
"""periodically callback"""
from datetime import datetime
from threading import Event, Lock, Thread
class StepTimer(Thread):
"""call on_time after interval number of seconds, then wait to continue"""
INIT = "init"
NEXT = "next"
STARTED = "started"
PAUSED = "paused"
STOPPING = "stopping"
STOPPED = "stopped"
def __init__(self, name, interval, on_time, logger, *args, **kwargs):
"""create step timer with controlled start. next step and pause"""
Thread.__init__(self, name=name)
self._interval = interval
self._on_time = on_time
self._logger = logger
self._args = args
self._kwargs = kwargs
self._lock = Lock()
self._timeout = Event()
self._paused = Event()
self._next = Event()
self._finished = Event()
self._event = StepTimer.INIT
self._event_counter = 0
self._event_time = 0
self._event_ts = datetime.now()
self._substep = None
self._substep_time = 0
self._substep_ts = datetime.now()
def get_status(self):
"""returns status of events"""
with self._lock:
return "{0}[{1}] {2}: timeout({3}), paused({4}), next({5}), finished({6})".format(
self._event,
self._event_counter,
self._substep,
self._timeout.is_set(),
self._paused.is_set(),
self._next.is_set(),
self._finished.is_set(),
)
def next(self):
"""continue with the next timeout"""
self._paused.clear()
self._next.set()
self._timeout.set()
self._set_timer_event(StepTimer.NEXT)
def pause(self):
"""pause the timer"""
self._paused.set()
self._next.clear()
self._set_timer_event(StepTimer.PAUSED)
def stop(self):
"""stop the timer if it hasn't finished yet"""
self._finished.set()
self._timeout.set()
self._next.set()
self._set_timer_event(StepTimer.STOPPING)
def _set_timer_event(self, event):
"""set the event on the timer"""
with self._lock:
if event in [StepTimer.NEXT, StepTimer.STARTED]:
self._event_counter += 1
self._event = event
now = datetime.now()
self._event_time = (now - self._event_ts).total_seconds()
self._event_ts = now
self._logger.info("[{0}] {1} {2}".format(
self._event_time, self.name, self.get_status()))
def _timer_substep(self, substep):
"""log exe step"""
with self._lock:
self._substep = substep
now = datetime.now()
self._substep_time = (now - self._substep_ts).total_seconds()
self._substep_ts = now
self._logger.info("[{0}] {1}".format(self._substep_time, self.get_status()))
def run(self):
"""loop one step a time until stopped=finished"""
self._set_timer_event(StepTimer.STARTED)
while True:
self._timer_substep("waiting for timeout {0}...".format(self._interval))
self._timeout.wait(self._interval)
self._timer_substep("woke up after timeout")
if self._finished.is_set():
self._timer_substep("finished")
break
if self._next.is_set():
self._next.clear()
self._timeout.clear()
self._timer_substep("restart timer")
continue
if self._paused.is_set():
self._timer_substep("paused - skip on_time event")
else:
self._timer_substep("on_time event")
self._on_time(*self._args, **self._kwargs)
self._timer_substep("waiting for next...")
self._next.wait()
self._next.clear()
self._timeout.clear()
self._timer_substep("woke up on next")
if self._finished.is_set():
self._timer_substep("finished")
break
self._set_timer_event(StepTimer.STOPPED)
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