[Sugar-devel] [PATCH] Add cpu and memory resource indicator to frame

[anishmangal2002]

This patch adds an icon to the frame, whose palette
menu displays the memory and cpu resources. For computing
free memory, the code reads the /proc/meminfo file (thanks
quozl) and for computing cpu usage, the code reads the
/proc/stat file.

The palette menu entries are only updated (in one second
intervals) when the palette menu is visible thus
possibly saving cpu cycles.

Signed-off-by: anishmangal2002 <anishmangal2002 at gmail.com>
---
 extensions/deviceicon/resources.py |  142 ++++++++++++++++++++++++++++++++++++
 1 files changed, 142 insertions(+), 0 deletions(-)
 create mode 100644 extensions/deviceicon/resources.py

diff --git a/extensions/deviceicon/resources.py b/extensions/deviceicon/resources.py
new file mode 100644
index 0000000..5da55ef
--- /dev/null
+++ b/extensions/deviceicon/resources.py
@@ -0,0 +1,142 @@
+# Copyright (C) 2010 Activity Central (http://activitycentral.org/)
+# Author: Anish Mangal <anishmangal2002 at 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 gobject
+import gtk
+import gconf
+
+from sugar.graphics.tray import TrayIcon
+from sugar.graphics.xocolor import XoColor
+from sugar.graphics.palette import Palette
+from sugar.graphics import style
+from jarabe.frame.frameinvoker import FrameWidgetInvoker
+
+class DeviceView(TrayIcon):
+
+    FRAME_POSITION_RELATIVE = 500
+
+    def __init__(self):
+        icon_name = 'computer'
+
+        client = gconf.client_get_default()
+        color = XoColor(client.get_string('/desktop/sugar/user/color'))
+        TrayIcon.__init__(self, icon_name=icon_name, xo_color=color)
+        self.set_palette_invoker(FrameWidgetInvoker(self))
+        self.connect('button-release-event', self.__button_release_event_cb)
+        self.connect('expose-event', self.__expose_event_cb)
+
+    def create_palette(self):
+        palette = ResourcePalette(_('System Resources'))
+        palette.set_group_id('frame')
+        return palette
+
+    def __button_release_event_cb(self, widget, event):
+        return True
+
+    def __expose_event_cb(self, *args):
+        pass
+
+class ResourcePalette(Palette):
+
+    def __init__(self, primary_text):
+        Palette.__init__(self, label=primary_text)
+
+        self.connect('popup', self.__popup_cb)
+        self.connect('popdown', self.__popdown_cb)
+
+        self.updating = False
+        self.proc_stat_old = []
+        self.proc_stat_new = []
+
+        vbox = gtk.VBox()
+        self.set_content(vbox)
+
+        self._cpu_text = gtk.Label()
+        vbox.pack_start(self._cpu_text, padding=10)
+        self._cpu_text.show()
+        self._cpu_bar = gtk.ProgressBar()
+        self._cpu_bar.set_size_request(
+            style.zoom(style.GRID_CELL_SIZE * 4), -1)
+        vbox.pack_start(self._cpu_bar, padding=10)
+        self._cpu_bar.show()
+
+        self._memory_text = gtk.Label()
+        vbox.pack_start(self._memory_text, padding=10)
+        self._memory_text.show()
+        self._memory_bar = gtk.ProgressBar()
+        self._memory_bar.set_size_request(
+            style.zoom(style.GRID_CELL_SIZE * 4), -1)
+        vbox.pack_start(self._memory_bar, padding=10)
+        self._memory_bar.show()
+
+        vbox.show()
+        gobject.timeout_add(1000, self.__timer_cb)
+
+    def __getTimeList(self):
+        statFile = file("/proc/stat", "r")
+        timeList = statFile.readline().split(" ")[2:6]
+        statFile.close()
+        for i in range(len(timeList)) :
+            timeList[i] = int(timeList[i])
+        return timeList
+
+    def __timer_cb(self):
+        if self.updating:
+            # Computing CPU usage statistics
+            self.proc_stat_new = self.__getTimeList()
+
+            for i in range(len(self.proc_stat_new)) :
+                self.proc_stat_new[i] -= self.proc_stat_old[i]
+
+            cpu_free = (self.proc_stat_new[len(self.proc_stat_new) - 1] * 100.00 /
+                    sum(self.proc_stat_new))
+
+            self._cpu_text.set_label('CPU free: %d%%' % cpu_free)
+            self._cpu_text.show()
+            self._cpu_bar.set_fraction(cpu_free/100.0)
+
+            memory_free = self.__percentage_memory_available()
+            self._memory_text.set_label('Memory free: %d%%' % memory_free)
+            self._memory_text.show()
+            self._memory_bar.set_fraction(memory_free/100.0)
+
+        self.proc_stat_old = self.__getTimeList()
+        return True
+
+    def __popup_cb(self, gobject):
+        self.updating = True
+
+    def __popdown_cb(self, gobject):
+        self.updating = False
+
+    def __percentage_memory_available(self):
+
+        for line in file('/proc/meminfo').readlines():
+            name, value, unit = line.split()[:3]
+            if 'MemTotal:' == name: total = value
+            elif 'MemFree:' == name: free = value
+            elif 'Buffers:' == name: buffers = value
+            elif 'Cached:' == name: cached = value
+            elif 'Active:' == name: break
+
+        return 100 * (int(free)+int(buffers)+int(cached)) / int(total)
+
+def setup(tray):
+    tray.add_device(DeviceView())
-- 
1.7.0.4