borgend/ui.py

#
# Borgend by Tuomo Valkonen, 2018
#
# Borgend MacOS tray icon UI
#

import rumps
import time
import datetime
import logging
import objc
from threading import Lock, Timer

from . import backup
from . import dreamtime
from . import branding
from .config import settings

logger=logging.getLogger(__name__)

traynames_ok={
    backup.State.INACTIVE: 'B.',
    backup.State.SCHEDULED: 'B.',
    backup.State.QUEUED: 'B:',
    backup.State.ACTIVE: 'B!',
}

traynames_errors={
    # The first one should never be used
    backup.Errors.OK: traynames_ok[backup.State.INACTIVE],
    backup.Errors.BUSY: 'B⦙',
    backup.Errors.OFFLINE: 'B⦙',
    backup.Errors.ERRORS: 'B?'
}

def trayname(ste):
    state=ste[0]
    errors=ste[1]
    if not errors.ok():
        return traynames_errors[errors]
    else:
        return traynames_ok[state]

def combine_state(a, b):
    return (max(a[0], b[0]), max(a[1], b[1]))

# Refresh the menu at most once a second to reduce flicker
refresh_interval=1.0

# Workaround to rumps brokenness;
# see https://github.com/jaredks/rumps/issues/59
def notification_workaround(title, subtitle, message):
    try:
        NSDictionary = objc.lookUpClass("NSDictionary")
        d=NSDictionary()

        rumps.notification(title, subtitle, message, data=d)
    except Exception as err:
        logger.exception("Failed to display notification")

# Based on code snatched from
# https://stackoverflow.com/questions/12523586/python-format-size-application-converting-b-to-kb-mb-gb-tb/37423778
def humanbytes(B):
   'Return the given bytes as a human friendly KB, MB, GB, or TB string'
   B = float(B)
   KB = float(1024)
   MB = float(KB ** 2) # 1,048,576
   GB = float(KB ** 3) # 1,073,741,824
   TB = float(KB ** 4) # 1,099,511,627,776

   if B < KB:
      return '{0}B'.format(B)
   elif KB <= B < MB:
      return '{0:.2f}KB'.format(B/KB)
   elif MB <= B < GB:
      return '{0:.2f}MB'.format(B/MB)
   elif GB <= B < TB:
      return '{0:.2f}GB'.format(B/GB)
   elif TB <= B:
      return '{0:.2f}TB'.format(B/TB)

def make_title(status):
    def add_info(info, new):
        if info:
            return "%s; %s" % (info, new)
        else:
            return new

    info=None
    this_need_reconstruct=None

    if not status.errors.ok():
        info=add_info(info, str(status.errors))

    if status.state==backup.State.SCHEDULED:
        # Operation scheduled
        when=status.when()
        now=time.time()

        if when<now:
            whenstr='overdue'
            info=''
        else:
            tnow=datetime.datetime.fromtimestamp(now)
            twhen=datetime.datetime.fromtimestamp(when)
            tendtoday=twhen.replace(hour=23,minute=59,second=59)
            tendtomorrow=tendtoday+datetime.timedelta(days=1)
            diff=datetime.timedelta(seconds=when-now)

            if twhen>tendtomorrow:
                whenday=datetime.date.fromtimestamp(when)
                whenstr='on %s' % twhen.date().isoformat()
                this_need_reconstruct=tendtoday+datetime.timedelta(seconds=1)
            elif diff.seconds>=12*60*60: # 12 hours
                whenstr='tomorrow'
                this_need_reconstruct=twhen-datetime.timedelta(hours=12)
            else:
                twhen=time.localtime(when)
                if twhen.tm_sec>30:
                    # Round up minute display to avoid user confusion
                    twhen=time.localtime(when+30)
                whenstr='at %02d:%02d' % (twhen.tm_hour, twhen.tm_min)

            this_info=''
            if 'reason' in status.detail:
                this_info=status.detail['reason'] + ' '

            when_how_sched= "%s%s %s" % (this_info, status.operation, whenstr)

            info=add_info(info, when_how_sched)

    elif status.state==backup.State.QUEUED:
        info=add_info(info, "queued")
    elif status.state==backup.State.ACTIVE:
        # Operation running
        progress=''
        d=status.detail
        if 'progress_current' in d and 'progress_total' in d:
            percentage = 100*float(d['progress_current'])/float(d['progress_total'])
            progress=': %d%%' % int(round(percentage))
            if 'operation_no' in d:
                progress='/#%d%s' % (d['operation_no'], progress)
        elif 'original_size' in d and 'deduplicated_size' in d:
            progress=' %s→%s' % (humanbytes(d['original_size']),
                                 humanbytes(d['deduplicated_size']))

        howrunning = "running %s%s" % (status.operation, progress)

        info=add_info(info, howrunning)
    else:
        pass

    if info:
        title=status.name + ' (' + info + ')'
    else:
        title=status.name

    return title, (status.state, status.errors), this_need_reconstruct

class BorgendTray(rumps.App):
    def __init__(self, backups):
        self.lock=Lock()
        self.backups=backups
        self.refresh_timer=None
        self.refresh_timer_time=None
        self.statuses=[None]*len(backups)

        for index in range(len(backups)):
            self.statuses[index]=backups[index].status()

        menu, title=self.build_menu_and_timer()

        super().__init__(title, menu=menu, quit_button=None)

        for index in range(len(backups)):
            # Python closures suck dog's balls; hence the _index=index hack
            # See also http://math.andrej.com/2009/04/09/pythons-lambda-is-broken/
            cb=(lambda status, errorlog=None, _index=index:
                self.__status_callback(_index, status, errorlog=errorlog))
            backups[index].set_status_update_callback(cb)

        dreamtime.add_callback(self, self.refresh_ui)

    def __rebuild_menu(self):
        menu=[]
        state=(backup.State.INACTIVE, backup.Errors.OK)
        need_reconstruct=None
        for index in range(len(self.backups)):
            b=self.backups[index]
            title, this_state, this_need_reconstruct=make_title(self.statuses[index])
            # Python closures suck dog's balls...
            # first and the last program I write in Python until somebody
            # fixes this brain damage
            cbm=lambda sender, _b=b: self.__menu_select_backup(sender, _b)
            item=rumps.MenuItem(title, callback=cbm)
            if not this_state[1].ok():
                item.state=-1
            elif this_state[0]==backup.State.SCHEDULED or this_state[0]==backup.State.QUEUED:
                item.state=1
            menu.append(item)
            state=combine_state(state, this_state)

            # Do we have to automatically update menu display?
            if not need_reconstruct:
                need_reconstruct=this_need_reconstruct
            elif this_need_reconstruct:
                need_reconstruct=min(need_reconstruct, this_need_reconstruct)

        menu_log=rumps.MenuItem("Show log", callback=lambda _: showlog())
        menu.append(menu_log)

        if not settings['no_quit_menu_entry']:
            menu_quit=rumps.MenuItem("Quit...", callback=lambda _: self.quit())
            menu.append(menu_quit)

        return menu, state, need_reconstruct

    def build_menu_and_timer(self):
        if self.refresh_timer:
            self.refresh_timer.cancel()
            self.refresh_timer=None
            self.refresh_timer_time=None
        logger.debug('Rebuilding menu')
        menu, state, need_reconstruct=self.__rebuild_menu()
        title=trayname(state)

        if need_reconstruct:
            when=time.mktime(need_reconstruct.timetuple())
            delay=when-time.time()
            self.refresh_timer=Timer(delay, self.refresh_ui)
            self.refresh_timer_time=need_reconstruct
            self.refresh_timer.start()

        return menu, title

    def refresh_ui(self):
        with self.lock:
            menu, title=self.build_menu_and_timer()
            self.menu.clear()
            self.menu.update(menu)
            self.title=title

    def __status_callback(self, index, status, errorlog=None):
        logger.debug("Tray status callback")
        with self.lock:
            self.statuses[index]=status
            # Time the refresh if it has not been timed, or if the timer
            # is timing for the "long-term" (refresh_timer_time set)
            if not self.refresh_timer or self.refresh_timer_time:
                logger.debug("Timing refresh")
                self.refresh_timer=Timer(refresh_interval, self.refresh_ui)
                # refresh_timer_time is only set for "long-term timers"
                self.refresh_timer_time=None
                self.refresh_timer.start()

        if errorlog:
            if 'msgid' not in errorlog or not isinstance(errorlog['msgid'], str):
                msgid='UnknownError'
            else:
                msgid=errorlog['msgid']

            logger.debug("Opening notification for error %s '%s'",
                         msgid, errorlog['message'])

            notification_workaround(branding.appname_stylised,
                                    msgid, errorlog['message'])

    def quit(self):
        rumps.quit_application()

    def __menu_select_backup(self, sender, b):
        #sender.state=not sender.state
        logger.debug("Manually backup '%s'", b.name)
        try:
            b.create()
        except Exception as err:
            logger.exception("Failure to initialise backup")
            notification_workaround(branding.appname_stylised,
                                    err.__class__.__name__, str(err))

#
# Log window
#

logwindow=[None]
logwindow_lock=Lock()

def showlog():
    try:
        w=None
        with logwindow_lock:
            if not logwindow[0]:
                lines=loggers.fifo.formatAll()
                msg="\n".join(lines[0:])
                w=rumps.Window(title=branding.appname_stylised+' log',
                               default_text=msg,
                               ok='Close',
                               dimensions=(640,320))
                logwindow[0]=w
        if w:
            try:
                w.run()
            finally:
                with logwindow_lock:
                    logwindow[0]=None
    except Exception as err:
        logger.exception("Failed to display log")

#
# Notification click response => show log window
#

@rumps.notifications
def notification_center(_):
    showlog()