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"""
Notification.py
by Jason Conti
February 19, 2010
Monitors DBUS for org.freedesktop.Notifications.Notify messages, parses them,
and notifies listeners when they arrive.
"""
import dbus
import glib
import gobject
import gtk
import logging
import time
from dbus.mainloop.glib import DBusGMainLoop
from locale import nl_langinfo, T_FMT
from Icon import load_icon, load_icon_from_file
logger = logging.getLogger("Notification")
class ImageDataException(Exception):
pass
class ImageData(object):
"""Parses the image_data hint from a DBUS message."""
def __init__(self, image_data):
if len(image_data) < 7:
raise ImageDataException("Invalid image_data: " + repr(image_data))
self.width = int(image_data[0])
self.height = int(image_data[1])
self.rowstride = int(image_data[2])
self.has_alpha = bool(image_data[3])
self.bits_per_sample = int(image_data[4])
self.channels = int(image_data[5])
self.data = self.dbus_array_to_str(image_data[6])
def dbus_array_to_str(self, array):
return "".join(map(chr, array))
def get_pixbuf(self, size):
"""Creates a pixbuf from the image data and scale it to the appropriate size."""
pixbuf = gtk.gdk.pixbuf_new_from_data(self.data, gtk.gdk.COLORSPACE_RGB,
self.has_alpha, self.bits_per_sample, self.width, self.height,
self.rowstride)
return pixbuf.scale_simple(size, size, gtk.gdk.INTERP_BILINEAR)
class MessageException(Exception):
pass
class Message(gobject.GObject):
"""Parses a DBUS message in the Notify format specified at:
http://www.galago-project.org/specs/notification/0.9/index.html"""
# Message urgency
LOW = 0
NORMAL = 1
CRITICAL = 2
def __init__(self, dbus_message = None, timestamp = None):
gobject.GObject.__init__(self)
self.timestamp = timestamp
args = dbus_message.get_args_list()
if len(args) != 8:
raise MessageException("Invalid message args_list: " + repr(args))
self.app_name = str(args[0])
self.replaces_id = args[1]
self.app_icon = str(args[2])
self.summary = str(args[3])
self.body = str(args[4])
self.actions = args[5]
self.hints = dict(args[6])
self.expire_timeout = args[7]
if "urgency" in self.hints:
urgency = self.hints["urgency"]
if urgency == 0:
self.urgency = Message.LOW
elif urgency == 2:
self.urgency = Message.CRITICAL
else:
self.urgency = Message.NORMAL
else:
self.urgency = Message.NORMAL
if "image_data" in self.hints:
self.image_data = ImageData(self.hints["image_data"])
else:
self.image_data = None
self.log_message()
def formatted_timestamp(self):
"""Returned the timestamp in a different format."""
#return time.strftime("%I:%M:%S %p", self.timestamp)
return time.strftime(nl_langinfo(T_FMT), self.timestamp)
def get_icon(self, size = 48):
"""Loads the icon into a pixbuf. Adapted from the load_icon code in
bubble.c of notify-osd."""
icon_name = self.app_icon
# Try to load the pixbuf from a file
if icon_name.startswith("file://") or icon_name.startswith("/"):
icon = load_icon_from_file(icon_name, size)
if icon != None:
return icon
# Try to load the pixbuf from the current icon theme
elif icon_name != "":
icon = load_icon(icon_name, size)
if icon != None:
return icon
# Try to load the image data from the message
elif self.image_data != None:
return self.image_data.get_pixbuf(32)
return self.get_default_icon(size)
def get_default_icon(self, size = 48):
"""Attempts to load the default message icon, returns None on failure."""
if self.urgency == Message.LOW:
return load_icon("notification-low", size)
elif self.urgency == Message.CRITICAL:
return load_icon("notification-critical", size)
else:
return load_icon("notification-normal", size)
def log_message(self):
"""Write debug info about a message."""
result = [
"-" * 50,
"Message created at: " + self.formatted_timestamp(),
"app_name: " + repr(self.app_name),
"replaces_id: " + repr(self.replaces_id),
"app_icon: " + repr(self.app_icon),
"summary: " + repr(self.summary),
"body: " + repr(self.body),
"actions: " + repr(self.actions),
"hints: " + repr(self.hints),
"expire_timeout: " + repr(self.expire_timeout),
"-" * 50
]
logger.debug("\n" + "\n".join(result))
class Notification(gobject.GObject):
"""Monitors DBUS for org.freedesktop.Notifications.Notify messages, parses them,
and notifies listeners when they arrive."""
__gsignals__ = {
"message-received": (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, [Message])
}
def __init__(self):
gobject.GObject.__init__(self)
self._match_string = "type='method_call',interface='org.freedesktop.Notifications',member='Notify'"
DBusGMainLoop(set_as_default=True)
self._bus = dbus.SessionBus()
self._bus.add_match_string(self._match_string)
self._bus.add_message_filter(self._message_filter)
def close(self):
self._bus.close()
def _message_filter(self, connection, dbus_message):
if dbus_message.get_member() == "Notify" and dbus_message.get_interface() == "org.freedesktop.Notifications":
try:
message = Message(dbus_message, time.localtime())
except:
logger.exception("Failed to parse dbus message: " + repr(dbus_message.get_args_list()))
else:
glib.idle_add(self.emit, "message-received", message)
if gtk.pygtk_version < (2, 8, 0):
gobject.type_register(Message)
gobject.type_register(Notification)
if __name__ == '__main__':
main()
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