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