SafeEyes/safeeyes/SafeEyesCore.py

301 lines
11 KiB
Python

#!/usr/bin/env python
# Safe Eyes is a utility to remind you to take break frequently
# to protect your eyes from eye strain.
# Copyright (C) 2016 Gobinath
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
SafeEyesCore provides the core functionalities of Safe Eyes.
"""
import datetime
import logging
import threading
import time
from safeeyes import Utility
from safeeyes.model import Break
from safeeyes.model import BreakType
from safeeyes.model import BreakQueue
from safeeyes.model import EventHook
from safeeyes.model import State
class SafeEyesCore(object):
"""
Core of Safe Eyes runs the scheduler and notifies the breaks.
"""
def __init__(self, context):
"""
Create an instance of SafeEyesCore and initialize the variables.
"""
self.break_queue = None
self.postpone_duration = 0
self.default_postpone_duration = 0
self.pre_break_warning_time = 0
self.running = False
self.scheduled_next_break_timestamp = -1
self.scheduled_next_break_time = None
self.paused_time = -1
# This event is fired before <time-to-prepare> for a break
self.on_pre_break = EventHook()
# This event is fired just before the start of a break
self.on_start_break = EventHook()
# This event is fired at the start of a break
self.start_break = EventHook()
# This event is fired during every count down
self.on_count_down = EventHook()
# This event is fired at the end of a break
self.on_stop_break = EventHook()
# This event is fired when deciding the next break time
self.on_update_next_break = EventHook()
self.waiting_condition = threading.Condition()
self.lock = threading.Lock()
self.context = context
self.context['skipped'] = False
self.context['postponed'] = False
self.context['state'] = State.WAITING
def initialize(self, config):
"""
Initialize the internal properties from configuration
"""
logging.info("Initialize the core")
self.pre_break_warning_time = config.get('pre_break_warning_time')
self.break_queue = BreakQueue(config, self.context)
self.default_postpone_duration = config.get('postpone_duration') * 60 # Convert to seconds
self.postpone_duration = self.default_postpone_duration
def start(self, next_break_time=-1):
"""
Start Safe Eyes is it is not running already.
"""
if self.break_queue.is_empty():
return
with self.lock:
if not self.running:
logging.info("Start Safe Eyes core")
self.running = True
self.scheduled_next_break_timestamp = int(next_break_time)
Utility.start_thread(self.__scheduler_job)
def stop(self):
"""
Stop Safe Eyes if it is running.
"""
with self.lock:
if not self.running:
return
logging.info("Stop Safe Eye core")
self.paused_time = datetime.datetime.now().timestamp()
# Stop the break thread
self.waiting_condition.acquire()
self.running = False
if self.context['state'] != State.QUIT:
self.context['state'] = State.STOPPED
self.waiting_condition.notify_all()
self.waiting_condition.release()
def skip(self):
"""
User skipped the break using Skip button
"""
self.context['skipped'] = True
def postpone(self, duration=-1):
"""
User postponed the break using Postpone button
"""
if duration > 0:
self.postpone_duration = duration
else:
self.postpone_duration = self.default_postpone_duration
logging.debug("Postpone the break for %d seconds", self.postpone_duration)
self.context['postponed'] = True
def take_break(self):
"""
Calling this method stops the scheduler and show the next break screen
"""
if self.break_queue.is_empty():
return
if not self.context['state'] == State.WAITING:
return
Utility.start_thread(self.__take_break)
def has_breaks(self):
"""
Check whether Safe Eyes has breaks or not.
"""
return not self.break_queue.is_empty()
def __take_break(self):
"""
Show the next break screen
"""
logging.info('Take a break due to external request')
with self.lock:
if not self.running:
return
logging.info("Stop the scheduler")
# Stop the break thread
self.waiting_condition.acquire()
self.running = False
self.waiting_condition.notify_all()
self.waiting_condition.release()
time.sleep(1) # Wait for 1 sec to ensure the sceduler is dead
self.running = True
Utility.execute_main_thread(self.__fire_start_break)
def __scheduler_job(self):
"""
Scheduler task to execute during every interval
"""
if not self.running:
return
self.context['state'] = State.WAITING
# Convert to seconds
time_to_wait = self.break_queue.get_break().time * 60
current_time = datetime.datetime.now()
current_timestamp = current_time.timestamp()
if self.context['postponed']:
# Previous break was postponed
logging.info('Prepare for postponed break')
time_to_wait = self.postpone_duration
self.context['postponed'] = False
elif self.paused_time > -1 and self.break_queue.is_long_break():
# Safe Eyes was paused earlier and next break is long
paused_duration = int(current_timestamp - self.paused_time)
self.paused_time = -1
if paused_duration > self.break_queue.get_break().duration:
logging.info('Skip next long break due to the pause longer than break duration')
# Skip the next long break
self.break_queue.next()
if current_timestamp < self.scheduled_next_break_timestamp:
time_to_wait = round(self.scheduled_next_break_timestamp - current_timestamp)
self.scheduled_next_break_timestamp = -1
self.scheduled_next_break_time = current_time + datetime.timedelta(seconds=time_to_wait)
Utility.execute_main_thread(self.__fire_on_update_next_break, self.scheduled_next_break_time)
# Wait for the pre break warning period
logging.info("Waiting for %d minutes until next break", (time_to_wait / 60))
self.__wait_for(time_to_wait)
logging.info("Pre-break waiting is over")
if not self.running:
return
Utility.execute_main_thread(self.__fire_pre_break)
def __fire_on_update_next_break(self, next_break_time):
"""
Pass the next break information to the registered listeners.
"""
self.on_update_next_break.fire(self.break_queue.get_break(), next_break_time)
def __fire_pre_break(self):
"""
Show the notification and start the break after the notification.
"""
self.context['state'] = State.PRE_BREAK
if not self.on_pre_break.fire(self.break_queue.get_break()):
# Plugins wanted to ignore this break
self.__start_next_break()
return
Utility.start_thread(self.__wait_until_prepare)
def __wait_until_prepare(self):
logging.info("Wait for %d seconds before the break", self.pre_break_warning_time)
# Wait for the pre break warning period
self.__wait_for(self.pre_break_warning_time)
if not self.running:
return
Utility.execute_main_thread(self.__fire_start_break)
def __postpone_break(self):
self.__wait_for(self.postpone_duration)
Utility.execute_main_thread(self.__fire_start_break)
def __fire_start_break(self):
# Show the break screen
if not self.on_start_break.fire(self.break_queue.get_break()):
# Plugins want to ignore this break
self.__start_next_break()
return
if self.context['postponed']:
# Plugins want to postpone this break
self.context['postponed'] = False
# Update the next break time
self.scheduled_next_break_time = self.scheduled_next_break_time + datetime.timedelta(seconds=self.postpone_duration)
self.__fire_on_update_next_break(self.scheduled_next_break_time)
# Wait in user thread
Utility.start_thread(self.__postpone_break)
else:
self.start_break.fire(self.break_queue.get_break())
Utility.start_thread(self.__start_break)
def __start_break(self):
"""
Start the break screen.
"""
self.context['state'] = State.BREAK
break_obj = self.break_queue.get_break()
countdown = break_obj.duration
total_break_time = countdown
while countdown and self.running and not self.context['skipped'] and not self.context['postponed']:
seconds = total_break_time - countdown
self.on_count_down.fire(countdown, seconds)
time.sleep(1) # Sleep for 1 second
countdown -= 1
Utility.execute_main_thread(self.__fire_stop_break)
def __fire_stop_break(self):
# Loop terminated because of timeout (not skipped) -> Close the break alert
if not self.context['skipped'] and not self.context['postponed']:
logging.info("Break is terminated automatically")
self.on_stop_break.fire()
# Reset the skipped flag
self.context['skipped'] = False
self.__start_next_break()
def __wait_for(self, duration):
"""
Wait until someone wake up or the timeout happens.
"""
self.waiting_condition.acquire()
self.waiting_condition.wait(duration)
self.waiting_condition.release()
def __start_next_break(self):
if not self.context['postponed']:
self.break_queue.next()
if self.running:
# Schedule the break again
Utility.start_thread(self.__scheduler_job)