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# Copyright (C) Anish Mangal <anishmangal2002@gmail.com>
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
from gettext import gettext as _
import logging
import os
from gi.repository import GObject
from gi.repository import Gtk
from gi.repository import GConf
from sugar3.graphics.tray import TrayIcon
from sugar3.graphics.xocolor import XoColor
from sugar3.graphics.palette import Palette
from sugar3.graphics import style
_SYSTEM_MOODS = ['-sad', '-normal', '-happy']
_ICON_NAME = 'computer'
_UPDATE_INTERVAL = 5 * 1000
class DeviceView(TrayIcon):
FRAME_POSITION_RELATIVE = 500
def __init__(self):
client = GConf.Client.get_default()
self._color = XoColor(client.get_string('/desktop/sugar/user/color'))
TrayIcon.__init__(self, icon_name=_ICON_NAME, xo_color=self._color)
self.create_palette()
self._icon_widget.connect('button-release-event', self._click_cb)
def create_palette(self):
self.palette = ResourcePalette(_('System resources'))
self.palette.set_group_id('frame')
self.palette.add_timer()
self.palette.connect('system-mood-changed',
self._system_mood_changed_cb)
return self.palette
def _system_mood_changed_cb(self, palette_, mood):
self.icon.props.icon_name = _ICON_NAME + mood
def _click_cb(self, widget, event):
self.palette_invoker.notify_right_click()
class ResourcePalette(Palette):
__gsignals__ = {
'system-mood-changed': (GObject.SignalFlags.RUN_FIRST, None, ([str])),
}
def __init__(self, primary_text):
Palette.__init__(self, label=primary_text)
self.vbox = Gtk.VBox()
self.set_content(self.vbox)
self._cpu_text = Gtk.Label()
self.vbox.pack_start(self._cpu_text, True, True, 0)
self._cpu_bar = Gtk.ProgressBar()
self._cpu_bar.set_size_request(
style.zoom(style.GRID_CELL_SIZE * 4), -1)
self.vbox.pack_start(self._cpu_bar, True, True, 0)
self._memory_text = Gtk.Label()
self.vbox.pack_start(self._memory_text, True, True, 0)
self._memory_bar = Gtk.ProgressBar()
self._memory_bar.set_size_request(
style.zoom(style.GRID_CELL_SIZE * 4), -1)
self.vbox.pack_start(self._memory_bar, True, True, 0)
self._system_mood = None
try:
self._cpu_times = self._get_cpu_times_list()
except IOError:
logging.exception('An error ocurred while attempting to '
'read /proc/stat')
self._stop_computing_statistics()
self.vbox.show()
self._cpu_text.show()
self._cpu_bar.show()
self._memory_text.show()
self._memory_bar.show()
def add_timer(self):
GObject.timeout_add(_UPDATE_INTERVAL, self.__timer_cb)
def _get_cpu_times_list(self):
"""Return various cpu times as read from /proc/stat
This method returns the following cpu times measured
in jiffies (1/100 of a second for x86 systems)
as an ordered list of numbers - [user, nice,
system, idle, iowait] where,
user: normal processes executing in user mode
nice: niced processes executing in user mode
system: processes executing in kernel mode
idle: twiddling thumbs
iowait: waiting for I/O to complete
Note: For systems having 2 or more CPU's, the above
numbers would be the cumulative sum of these times
for all CPU's present in the system.
"""
return [int(count)
for count in file('/proc/stat').readline().split()[1:6]]
def _percentage_cpu_available(self):
"""
Return free CPU resources as a percentage
"""
_cpu_times_new = self._get_cpu_times_list()
_cpu_times_current = [(new - old)
for new, old in zip(_cpu_times_new, self._cpu_times)]
user_, nice_, system_, idle, iowait = _cpu_times_current
cpu_free = (idle + iowait) * 100.0 / sum(_cpu_times_current)
self._cpu_times = self._get_cpu_times_list()
return cpu_free
def _percentage_memory_available(self):
"""
Return free memory as a percentage
"""
for line in file('/proc/meminfo'):
name, value, unit_ = line.split()[:3]
if 'MemTotal:' == name:
total = int(value)
elif 'MemFree:' == name:
free = int(value)
elif 'Buffers:' == name:
buffers = int(value)
elif 'Cached:' == name:
cached = int(value)
elif 'Active:' == name:
break
return (free + buffers + cached) * 100.0 / total
def __timer_cb(self):
try:
cpu_in_use = 100 - self._percentage_cpu_available()
memory_in_use = 100 - self._percentage_memory_available()
except IOError:
logging.exception('An error ocurred while trying to '
'retrieve resource usage statistics')
self._stop_and_show_error()
return False
else:
self._cpu_text.set_label(_('CPU in use: %d%%%' % cpu_in_use))
self._cpu_bar.set_fraction(float(cpu_in_use) / 100)
self._memory_text.set_label(_('Memory in use: %d%%%' %
memory_in_use))
self._memory_bar.set_fraction(float(memory_in_use) / 100)
# both cpu_free and memory_free lie between 0-100
system_mood = _SYSTEM_MOODS[
int(300 - (cpu_in_use + 2 * memory_in_use)) // 100]
# check if self._system_mood exists
try:
if self._system_mood != system_mood:
self.emit('system-mood-changed', system_mood)
self._system_mood = system_mood
except AttributeError:
self.emit('system-mood-changed', system_mood)
self._system_mood = system_mood
return True
def _stop_and_show_error(self):
"""
Stop computing usage statistics and display an error message
since we've hit an exception.
"""
# Use the existing _cpu_text label to display the error. Remove
# everything else.
self._cpu_text.set_size_request(
style.zoom(style.GRID_CELL_SIZE * 4), -1)
self._cpu_text.set_line_wrap(True)
self._cpu_text.set_text(_('Cannot compute CPU and memory usage '
'statistics!'))
self.vbox.remove(self._cpu_bar)
self.vbox.remove(self._memory_text)
self.vbox.remove(self._memory_bar)
self.emit('system-mood-changed', '-error')
def setup(tray):
client = GConf.Client.get_default()
if not client.get_bool('/desktop/sugar/frame/show_network_resources'):
return
if not (os.path.exists('/proc/stat') and os.path.exists('/proc/meminfo')):
logging.warning('Either /proc/stat or /proc/meminfo not present. Not '
'adding the CPU and memory usage icon to the frame')
return
tray.add_device(DeviceView())
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