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Use D-Bus properties instead of our own methods.

* mandos (Client._datetime_to_milliseconds): Renamed to
                                             "_timedelta_to_milliseconds".
                                             All callers changed.
  (dbus_service_property): New decorator for D-Bus properties.
  (DBusPropertyException, DBusPropertyAccessException,
  DBusPropertyNotFound): New D-Bus exception classes.
  (DBusObjectWithProperties): New; extends "dbus.service.Object" with
                              support for properties.
  (ClientDBus): Inherit from, and call up to, "DBusObjectWithProperties".
  (ClientDBus.CheckedOK, ClientDBus.GetAllProperties,
  ClientDBus.SetChecker, ClientDBus.SetHost, ClientDBus.SetInterval,
  ClientDBus.SetSecret, ClientDBus.SetTimeout, ClientDBus.Enable,
  ClientDBus.StartChecker, ClientDBus.Disable,
  ClientDBus.StopChecker): Removed, replaced with properties.
  (ClientDBus.IsStillValid): Removed, superfluous.
  (ClientDBus.name_dbus_property,
  ClientDBus.fingerprint_dbus_property, ClientDBus.host_dbus_property,
  ClientDBus.created_dbus_property,
  ClientDBus.last_enabled_dbus_property,
  ClientDBus.enabled_dbus_property,
  ClientDBus.last_checked_ok_dbus_property,
  ClientDBus.timeout_dbus_property, ClientDBus.interval_dbus_property,
  ClientDBus.checker_dbus_property,
  ClientDBus.checker_running_dbus_property,
  ClientDBus.object_path_dbus_property,
  ClientDBus.secret_dbus_property): New D-Bus properties.

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Lines of Context:
mandos-monitor
1
 
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
 
4
 
from __future__ import division, absolute_import, with_statement
5
 
 
6
 
import sys
7
 
import os
8
 
import signal
9
 
 
10
 
import datetime
11
 
 
12
 
import urwid.curses_display
13
 
import urwid
14
 
 
15
 
from dbus.mainloop.glib import DBusGMainLoop
16
 
import gobject
17
 
 
18
 
import dbus
19
 
 
20
 
import UserList
21
 
 
22
 
import locale
23
 
 
24
 
locale.setlocale(locale.LC_ALL, u'')
25
 
 
26
 
import logging
27
 
logging.getLogger('dbus.proxies').setLevel(logging.CRITICAL)
28
 
 
29
 
# Some useful constants
30
 
domain = 'se.bsnet.fukt'
31
 
server_interface = domain + '.Mandos'
32
 
client_interface = domain + '.Mandos.Client'
33
 
version = "1.0.15"
34
 
 
35
 
# Always run in monochrome mode
36
 
urwid.curses_display.curses.has_colors = lambda : False
37
 
 
38
 
# Urwid doesn't support blinking, but we want it.  Since we have no
39
 
# use for underline on its own, we make underline also always blink.
40
 
urwid.curses_display.curses.A_UNDERLINE |= (
41
 
    urwid.curses_display.curses.A_BLINK)
42
 
 
43
 
def isoformat_to_datetime(iso):
44
 
    "Parse an ISO 8601 date string to a datetime.datetime()"
45
 
    if not iso:
46
 
        return None
47
 
    d, t = iso.split(u"T", 1)
48
 
    year, month, day = d.split(u"-", 2)
49
 
    hour, minute, second = t.split(u":", 2)
50
 
    second, fraction = divmod(float(second), 1)
51
 
    return datetime.datetime(int(year),
52
 
                             int(month),
53
 
                             int(day),
54
 
                             int(hour),
55
 
                             int(minute),
56
 
                             int(second),           # Whole seconds
57
 
                             int(fraction*1000000)) # Microseconds
58
 
 
59
 
class MandosClientPropertyCache(object):
60
 
    """This wraps a Mandos Client D-Bus proxy object, caches the
61
 
    properties and calls a hook function when any of them are
62
 
    changed.
63
 
    """
64
 
    def __init__(self, proxy_object=None, *args, **kwargs):
65
 
        self.proxy = proxy_object # Mandos Client proxy object
66
 
        
67
 
        self.properties = dict()
68
 
        self.proxy.connect_to_signal(u"PropertyChanged",
69
 
                                     self.property_changed,
70
 
                                     client_interface,
71
 
                                     byte_arrays=True)
72
 
        
73
 
        self.properties.update(
74
 
            self.proxy.GetAll(client_interface,
75
 
                              dbus_interface = dbus.PROPERTIES_IFACE))
76
 
 
77
 
        #XXX This break good super behaviour!
78
 
#        super(MandosClientPropertyCache, self).__init__(
79
 
#            *args, **kwargs)
80
 
    
81
 
    def property_changed(self, property=None, value=None):
82
 
        """This is called whenever we get a PropertyChanged signal
83
 
        It updates the changed property in the "properties" dict.
84
 
        """
85
 
        # Update properties dict with new value
86
 
        self.properties[property] = value
87
 
 
88
 
 
89
 
class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):
90
 
    """A Mandos Client which is visible on the screen.
91
 
    """
92
 
    
93
 
    def __init__(self, server_proxy_object=None, update_hook=None,
94
 
                 delete_hook=None, logger=None, *args, **kwargs):
95
 
        # Called on update
96
 
        self.update_hook = update_hook
97
 
        # Called on delete
98
 
        self.delete_hook = delete_hook
99
 
        # Mandos Server proxy object
100
 
        self.server_proxy_object = server_proxy_object
101
 
        # Logger
102
 
        self.logger = logger
103
 
        
104
 
        self._update_timer_callback_tag = None
105
 
        self.last_checker_failed = False
106
 
        
107
 
        # The widget shown normally
108
 
        self._text_widget = urwid.Text(u"")
109
 
        # The widget shown when we have focus
110
 
        self._focus_text_widget = urwid.Text(u"")
111
 
        super(MandosClientWidget, self).__init__(
112
 
            update_hook=update_hook, delete_hook=delete_hook,
113
 
            *args, **kwargs)
114
 
        self.update()
115
 
        self.opened = False
116
 
        self.proxy.connect_to_signal(u"CheckerCompleted",
117
 
                                     self.checker_completed,
118
 
                                     client_interface,
119
 
                                     byte_arrays=True)
120
 
        self.proxy.connect_to_signal(u"CheckerStarted",
121
 
                                     self.checker_started,
122
 
                                     client_interface,
123
 
                                     byte_arrays=True)
124
 
        self.proxy.connect_to_signal(u"GotSecret",
125
 
                                     self.got_secret,
126
 
                                     client_interface,
127
 
                                     byte_arrays=True)
128
 
        self.proxy.connect_to_signal(u"NeedApproval",
129
 
                                     self.need_approval,
130
 
                                     client_interface,
131
 
                                     byte_arrays=True)
132
 
        self.proxy.connect_to_signal(u"Rejected",
133
 
                                     self.rejected,
134
 
                                     client_interface,
135
 
                                     byte_arrays=True)
136
 
        last_checked_ok = isoformat_to_datetime(self.properties
137
 
                                                [u"LastCheckedOK"])
138
 
        if last_checked_ok is None:
139
 
            self.last_checker_failed = True
140
 
        else:
141
 
            self.last_checker_failed = ((datetime.datetime.utcnow()
142
 
                                         - last_checked_ok)
143
 
                                        > datetime.timedelta
144
 
                                        (milliseconds=
145
 
                                         self.properties
146
 
                                         [u"Interval"]))
147
 
        if self.last_checker_failed:
148
 
            self._update_timer_callback_tag = (gobject.timeout_add
149
 
                                               (1000,
150
 
                                                self.update_timer))
151
 
    
152
 
    def checker_completed(self, exitstatus, condition, command):
153
 
        if exitstatus == 0:
154
 
            if self.last_checker_failed:
155
 
                self.last_checker_failed = False
156
 
                gobject.source_remove(self._update_timer_callback_tag)
157
 
                self._update_timer_callback_tag = None
158
 
            #self.logger(u'Checker for client %s (command "%s")'
159
 
            #            u' was successful'
160
 
            #            % (self.properties[u"Name"], command))
161
 
            self.update()
162
 
            return
163
 
        # Checker failed
164
 
        if not self.last_checker_failed:
165
 
            self.last_checker_failed = True
166
 
            self._update_timer_callback_tag = (gobject.timeout_add
167
 
                                               (1000,
168
 
                                                self.update_timer))
169
 
        if os.WIFEXITED(condition):
170
 
            self.logger(u'Checker for client %s (command "%s")'
171
 
                        u' failed with exit code %s'
172
 
                        % (self.properties[u"Name"], command,
173
 
                           os.WEXITSTATUS(condition)))
174
 
        elif os.WIFSIGNALED(condition):
175
 
            self.logger(u'Checker for client %s (command "%s")'
176
 
                        u' was killed by signal %s'
177
 
                        % (self.properties[u"Name"], command,
178
 
                           os.WTERMSIG(condition)))
179
 
        elif os.WCOREDUMP(condition):
180
 
            self.logger(u'Checker for client %s (command "%s")'
181
 
                        u' dumped core'
182
 
                        % (self.properties[u"Name"], command))
183
 
        else:
184
 
            self.logger(u'Checker for client %s completed'
185
 
                        u' mysteriously')
186
 
        self.update()
187
 
    
188
 
    def checker_started(self, command):
189
 
        #self.logger(u'Client %s started checker "%s"'
190
 
        #            % (self.properties[u"Name"], unicode(command)))
191
 
        pass
192
 
    
193
 
    def got_secret(self):
194
 
        self.last_checker_failed = False
195
 
        self.logger(u'Client %s received its secret'
196
 
                    % self.properties[u"Name"])
197
 
    
198
 
    def need_approval(self, timeout, default):
199
 
        if not default:
200
 
            message = u'Client %s needs approval within %s seconds'
201
 
        else:
202
 
            message = u'Client %s will get its secret in %s seconds'
203
 
        self.logger(message
204
 
                    % (self.properties[u"Name"], timeout/1000))
205
 
    
206
 
    def rejected(self, reason):
207
 
        self.logger(u'Client %s was rejected; reason: %s'
208
 
                    % (self.properties[u"Name"], reason))
209
 
    
210
 
    def selectable(self):
211
 
        """Make this a "selectable" widget.
212
 
        This overrides the method from urwid.FlowWidget."""
213
 
        return True
214
 
    
215
 
    def rows(self, (maxcol,), focus=False):
216
 
        """How many rows this widget will occupy might depend on
217
 
        whether we have focus or not.
218
 
        This overrides the method from urwid.FlowWidget"""
219
 
        return self.current_widget(focus).rows((maxcol,), focus=focus)
220
 
    
221
 
    def current_widget(self, focus=False):
222
 
        if focus or self.opened:
223
 
            return self._focus_widget
224
 
        return self._widget
225
 
    
226
 
    def update(self):
227
 
        "Called when what is visible on the screen should be updated."
228
 
        # How to add standout mode to a style
229
 
        with_standout = { u"normal": u"standout",
230
 
                          u"bold": u"bold-standout",
231
 
                          u"underline-blink":
232
 
                              u"underline-blink-standout",
233
 
                          u"bold-underline-blink":
234
 
                              u"bold-underline-blink-standout",
235
 
                          }
236
 
 
237
 
        # Rebuild focus and non-focus widgets using current properties
238
 
 
239
 
        # Base part of a client. Name!
240
 
        base = (u'%(name)s: '
241
 
                      % {u"name": self.properties[u"Name"]})
242
 
        if not self.properties[u"Enabled"]:
243
 
            message = u"DISABLED"
244
 
        elif self.properties[u"ApprovalPending"]:
245
 
            if self.properties[u"ApprovedByDefault"]:
246
 
                message = u"Connection established to client. (d)eny?"
247
 
            else:
248
 
                message = u"Seeks approval to send secret. (a)pprove?"
249
 
        elif self.last_checker_failed:
250
 
            timeout = datetime.timedelta(milliseconds
251
 
                                         = self.properties
252
 
                                         [u"Timeout"])
253
 
            last_ok = isoformat_to_datetime(
254
 
                max((self.properties[u"LastCheckedOK"]
255
 
                     or self.properties[u"Created"]),
256
 
                    self.properties[u"LastEnabled"]))
257
 
            timer = timeout - (datetime.datetime.utcnow() - last_ok)
258
 
            message = (u'A checker has failed! Time until client'
259
 
                       u' gets diabled: %s'
260
 
                           % unicode(timer).rsplit(".", 1)[0])
261
 
        else:
262
 
            message = u"enabled"
263
 
        self._text = "%s%s" % (base, message)
264
 
            
265
 
        if not urwid.supports_unicode():
266
 
            self._text = self._text.encode("ascii", "replace")
267
 
        textlist = [(u"normal", self._text)]
268
 
        self._text_widget.set_text(textlist)
269
 
        self._focus_text_widget.set_text([(with_standout[text[0]],
270
 
                                           text[1])
271
 
                                          if isinstance(text, tuple)
272
 
                                          else text
273
 
                                          for text in textlist])
274
 
        self._widget = self._text_widget
275
 
        self._focus_widget = urwid.AttrWrap(self._focus_text_widget,
276
 
                                            "standout")
277
 
        # Run update hook, if any
278
 
        if self.update_hook is not None:
279
 
            self.update_hook()
280
 
    
281
 
    def update_timer(self):
282
 
        "called by gobject"
283
 
        self.update()
284
 
        return True             # Keep calling this
285
 
    
286
 
    def delete(self):
287
 
        if self._update_timer_callback_tag is not None:
288
 
            gobject.source_remove(self._update_timer_callback_tag)
289
 
            self._update_timer_callback_tag = None
290
 
        if self.delete_hook is not None:
291
 
            self.delete_hook(self)
292
 
    
293
 
    def render(self, (maxcol,), focus=False):
294
 
        """Render differently if we have focus.
295
 
        This overrides the method from urwid.FlowWidget"""
296
 
        return self.current_widget(focus).render((maxcol,),
297
 
                                                 focus=focus)
298
 
    
299
 
    def keypress(self, (maxcol,), key):
300
 
        """Handle keys.
301
 
        This overrides the method from urwid.FlowWidget"""
302
 
        if key == u"+":
303
 
            self.proxy.Enable(dbus_interface = client_interface)
304
 
        elif key == u"-":
305
 
            self.proxy.Disable(dbus_interface = client_interface)
306
 
        elif key == u"a":
307
 
            self.proxy.Approve(dbus.Boolean(True, variant_level=1),
308
 
                               dbus_interface = client_interface)
309
 
        elif key == u"d":
310
 
            self.proxy.Approve(dbus.Boolean(False, variant_level=1),
311
 
                                  dbus_interface = client_interface)
312
 
        elif key == u"r" or key == u"_" or key == u"ctrl k":
313
 
            self.server_proxy_object.RemoveClient(self.proxy
314
 
                                                  .object_path)
315
 
        elif key == u"s":
316
 
            self.proxy.StartChecker(dbus_interface = client_interface)
317
 
        elif key == u"S":
318
 
            self.proxy.StopChecker(dbus_interface = client_interface)
319
 
        elif key == u"C":
320
 
            self.proxy.CheckedOK(dbus_interface = client_interface)
321
 
        # xxx
322
 
#         elif key == u"p" or key == "=":
323
 
#             self.proxy.pause()
324
 
#         elif key == u"u" or key == ":":
325
 
#             self.proxy.unpause()
326
 
#         elif key == u"RET":
327
 
#             self.open()
328
 
#        elif key == u"+":
329
 
#            self.proxy.Approve(True)
330
 
#        elif key == u"-":
331
 
#            self.proxy.Approve(False)
332
 
        else:
333
 
            return key
334
 
    
335
 
    def property_changed(self, property=None, value=None,
336
 
                         *args, **kwargs):
337
 
        """Call self.update() if old value is not new value.
338
 
        This overrides the method from MandosClientPropertyCache"""
339
 
        property_name = unicode(property)
340
 
        old_value = self.properties.get(property_name)
341
 
        super(MandosClientWidget, self).property_changed(
342
 
            property=property, value=value, *args, **kwargs)
343
 
        if self.properties.get(property_name) != old_value:
344
 
            self.update()
345
 
 
346
 
 
347
 
class ConstrainedListBox(urwid.ListBox):
348
 
    """Like a normal urwid.ListBox, but will consume all "up" or
349
 
    "down" key presses, thus not allowing any containing widgets to
350
 
    use them as an excuse to shift focus away from this widget.
351
 
    """
352
 
    def keypress(self, (maxcol, maxrow), key):
353
 
        ret = super(ConstrainedListBox, self).keypress((maxcol,
354
 
                                                        maxrow), key)
355
 
        if ret in (u"up", u"down"):
356
 
            return
357
 
        return ret
358
 
 
359
 
 
360
 
class UserInterface(object):
361
 
    """This is the entire user interface - the whole screen
362
 
    with boxes, lists of client widgets, etc.
363
 
    """
364
 
    def __init__(self, max_log_length=1000):
365
 
        DBusGMainLoop(set_as_default=True)
366
 
        
367
 
        self.screen = urwid.curses_display.Screen()
368
 
        
369
 
        self.screen.register_palette((
370
 
                (u"normal",
371
 
                 u"default", u"default", None),
372
 
                (u"bold",
373
 
                 u"default", u"default", u"bold"),
374
 
                (u"underline-blink",
375
 
                 u"default", u"default", u"underline"),
376
 
                (u"standout",
377
 
                 u"default", u"default", u"standout"),
378
 
                (u"bold-underline-blink",
379
 
                 u"default", u"default", (u"bold", u"underline")),
380
 
                (u"bold-standout",
381
 
                 u"default", u"default", (u"bold", u"standout")),
382
 
                (u"underline-blink-standout",
383
 
                 u"default", u"default", (u"underline", u"standout")),
384
 
                (u"bold-underline-blink-standout",
385
 
                 u"default", u"default", (u"bold", u"underline",
386
 
                                          u"standout")),
387
 
                ))
388
 
        
389
 
        if urwid.supports_unicode():
390
 
            self.divider = u"─" # \u2500
391
 
            #self.divider = u"━" # \u2501
392
 
        else:
393
 
            #self.divider = u"-" # \u002d
394
 
            self.divider = u"_" # \u005f
395
 
        
396
 
        self.screen.start()
397
 
        
398
 
        self.size = self.screen.get_cols_rows()
399
 
        
400
 
        self.clients = urwid.SimpleListWalker([])
401
 
        self.clients_dict = {}
402
 
        
403
 
        # We will add Text widgets to this list
404
 
        self.log = []
405
 
        self.max_log_length = max_log_length
406
 
        
407
 
        # We keep a reference to the log widget so we can remove it
408
 
        # from the ListWalker without it getting destroyed
409
 
        self.logbox = ConstrainedListBox(self.log)
410
 
        
411
 
        # This keeps track of whether self.uilist currently has
412
 
        # self.logbox in it or not
413
 
        self.log_visible = True
414
 
        self.log_wrap = u"any"
415
 
        
416
 
        self.rebuild()
417
 
        self.log_message_raw((u"bold",
418
 
                              u"Mandos Monitor version " + version))
419
 
        self.log_message_raw((u"bold",
420
 
                              u"q: Quit  ?: Help"))
421
 
        
422
 
        self.busname = domain + '.Mandos'
423
 
        self.main_loop = gobject.MainLoop()
424
 
        self.bus = dbus.SystemBus()
425
 
        mandos_dbus_objc = self.bus.get_object(
426
 
            self.busname, u"/", follow_name_owner_changes=True)
427
 
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
428
 
                                          dbus_interface
429
 
                                          = server_interface)
430
 
        try:
431
 
            mandos_clients = (self.mandos_serv
432
 
                              .GetAllClientsWithProperties())
433
 
        except dbus.exceptions.DBusException:
434
 
            mandos_clients = dbus.Dictionary()
435
 
        
436
 
        (self.mandos_serv
437
 
         .connect_to_signal(u"ClientRemoved",
438
 
                            self.find_and_remove_client,
439
 
                            dbus_interface=server_interface,
440
 
                            byte_arrays=True))
441
 
        (self.mandos_serv
442
 
         .connect_to_signal(u"ClientAdded",
443
 
                            self.add_new_client,
444
 
                            dbus_interface=server_interface,
445
 
                            byte_arrays=True))
446
 
        (self.mandos_serv
447
 
         .connect_to_signal(u"ClientNotFound",
448
 
                            self.client_not_found,
449
 
                            dbus_interface=server_interface,
450
 
                            byte_arrays=True))
451
 
        for path, client in mandos_clients.iteritems():
452
 
            client_proxy_object = self.bus.get_object(self.busname,
453
 
                                                      path)
454
 
            self.add_client(MandosClientWidget(server_proxy_object
455
 
                                               =self.mandos_serv,
456
 
                                               proxy_object
457
 
                                               =client_proxy_object,
458
 
                                               properties=client,
459
 
                                               update_hook
460
 
                                               =self.refresh,
461
 
                                               delete_hook
462
 
                                               =self.remove_client,
463
 
                                               logger
464
 
                                               =self.log_message),
465
 
                            path=path)
466
 
    
467
 
    def client_not_found(self, fingerprint, address):
468
 
        self.log_message((u"Client with address %s and fingerprint %s"
469
 
                          u" could not be found" % (address,
470
 
                                                    fingerprint)))
471
 
    
472
 
    def rebuild(self):
473
 
        """This rebuilds the User Interface.
474
 
        Call this when the widget layout needs to change"""
475
 
        self.uilist = []
476
 
        #self.uilist.append(urwid.ListBox(self.clients))
477
 
        self.uilist.append(urwid.Frame(ConstrainedListBox(self.
478
 
                                                          clients),
479
 
                                       #header=urwid.Divider(),
480
 
                                       header=None,
481
 
                                       footer=
482
 
                                       urwid.Divider(div_char=
483
 
                                                     self.divider)))
484
 
        if self.log_visible:
485
 
            self.uilist.append(self.logbox)
486
 
            pass
487
 
        self.topwidget = urwid.Pile(self.uilist)
488
 
    
489
 
    def log_message(self, message):
490
 
        timestamp = datetime.datetime.now().isoformat()
491
 
        self.log_message_raw(timestamp + u": " + message)
492
 
    
493
 
    def log_message_raw(self, markup):
494
 
        """Add a log message to the log buffer."""
495
 
        self.log.append(urwid.Text(markup, wrap=self.log_wrap))
496
 
        if (self.max_log_length
497
 
            and len(self.log) > self.max_log_length):
498
 
            del self.log[0:len(self.log)-self.max_log_length-1]
499
 
        self.logbox.set_focus(len(self.logbox.body.contents),
500
 
                              coming_from=u"above")
501
 
        self.refresh()
502
 
    
503
 
    def toggle_log_display(self):
504
 
        """Toggle visibility of the log buffer."""
505
 
        self.log_visible = not self.log_visible
506
 
        self.rebuild()
507
 
        self.log_message(u"Log visibility changed to: "
508
 
                         + unicode(self.log_visible))
509
 
    
510
 
    def change_log_display(self):
511
 
        """Change type of log display.
512
 
        Currently, this toggles wrapping of text lines."""
513
 
        if self.log_wrap == u"clip":
514
 
            self.log_wrap = u"any"
515
 
        else:
516
 
            self.log_wrap = u"clip"
517
 
        for textwidget in self.log:
518
 
            textwidget.set_wrap_mode(self.log_wrap)
519
 
        self.log_message(u"Wrap mode: " + self.log_wrap)
520
 
    
521
 
    def find_and_remove_client(self, path, name):
522
 
        """Find an client from its object path and remove it.
523
 
        
524
 
        This is connected to the ClientRemoved signal from the
525
 
        Mandos server object."""
526
 
        try:
527
 
            client = self.clients_dict[path]
528
 
        except KeyError:
529
 
            # not found?
530
 
            return
531
 
        self.remove_client(client, path)
532
 
    
533
 
    def add_new_client(self, path):
534
 
        client_proxy_object = self.bus.get_object(self.busname, path)
535
 
        self.add_client(MandosClientWidget(server_proxy_object
536
 
                                           =self.mandos_serv,
537
 
                                           proxy_object
538
 
                                           =client_proxy_object,
539
 
                                           update_hook
540
 
                                           =self.refresh,
541
 
                                           delete_hook
542
 
                                           =self.remove_client,
543
 
                                           logger
544
 
                                           =self.log_message),
545
 
                        path=path)
546
 
    
547
 
    def add_client(self, client, path=None):
548
 
        self.clients.append(client)
549
 
        if path is None:
550
 
            path = client.proxy.object_path
551
 
        self.clients_dict[path] = client
552
 
        self.clients.sort(None, lambda c: c.properties[u"Name"])
553
 
        self.refresh()
554
 
    
555
 
    def remove_client(self, client, path=None):
556
 
        self.clients.remove(client)
557
 
        if path is None:
558
 
            path = client.proxy.object_path
559
 
        del self.clients_dict[path]
560
 
        if not self.clients_dict:
561
 
            # Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker
562
 
            # is completely emptied, we need to recreate it.
563
 
            self.clients = urwid.SimpleListWalker([])
564
 
            self.rebuild()
565
 
        self.refresh()
566
 
    
567
 
    def refresh(self):
568
 
        """Redraw the screen"""
569
 
        canvas = self.topwidget.render(self.size, focus=True)
570
 
        self.screen.draw_screen(self.size, canvas)
571
 
    
572
 
    def run(self):
573
 
        """Start the main loop and exit when it's done."""
574
 
        self.refresh()
575
 
        self._input_callback_tag = (gobject.io_add_watch
576
 
                                    (sys.stdin.fileno(),
577
 
                                     gobject.IO_IN,
578
 
                                     self.process_input))
579
 
        self.main_loop.run()
580
 
        # Main loop has finished, we should close everything now
581
 
        gobject.source_remove(self._input_callback_tag)
582
 
        self.screen.stop()
583
 
    
584
 
    def stop(self):
585
 
        self.main_loop.quit()
586
 
    
587
 
    def process_input(self, source, condition):
588
 
        keys = self.screen.get_input()
589
 
        translations = { u"ctrl n": u"down",      # Emacs
590
 
                         u"ctrl p": u"up",        # Emacs
591
 
                         u"ctrl v": u"page down", # Emacs
592
 
                         u"meta v": u"page up",   # Emacs
593
 
                         u" ": u"page down",      # less
594
 
                         u"f": u"page down",      # less
595
 
                         u"b": u"page up",        # less
596
 
                         u"j": u"down",           # vi
597
 
                         u"k": u"up",             # vi
598
 
                         }
599
 
        for key in keys:
600
 
            try:
601
 
                key = translations[key]
602
 
            except KeyError:    # :-)
603
 
                pass
604
 
            
605
 
            if key == u"q" or key == u"Q":
606
 
                self.stop()
607
 
                break
608
 
            elif key == u"window resize":
609
 
                self.size = self.screen.get_cols_rows()
610
 
                self.refresh()
611
 
            elif key == u"\f":  # Ctrl-L
612
 
                self.refresh()
613
 
            elif key == u"l" or key == u"D":
614
 
                self.toggle_log_display()
615
 
                self.refresh()
616
 
            elif key == u"w" or key == u"i":
617
 
                self.change_log_display()
618
 
                self.refresh()
619
 
            elif key == u"?" or key == u"f1" or key == u"esc":
620
 
                if not self.log_visible:
621
 
                    self.log_visible = True
622
 
                    self.rebuild()
623
 
                self.log_message_raw((u"bold",
624
 
                                      u"  ".
625
 
                                      join((u"q: Quit",
626
 
                                            u"?: Help",
627
 
                                            u"l: Log window toggle",
628
 
                                            u"TAB: Switch window",
629
 
                                            u"w: Wrap (log)"))))
630
 
                self.log_message_raw((u"bold",
631
 
                                      u"  "
632
 
                                      .join((u"Clients:",
633
 
                                             u"+: Enable",
634
 
                                             u"-: Disable",
635
 
                                             u"r: Remove",
636
 
                                             u"s: Start new checker",
637
 
                                             u"S: Stop checker",
638
 
                                             u"C: Checker OK",
639
 
                                             u"a: Approve",
640
 
                                             u"d: Deny"))))
641
 
                self.refresh()
642
 
            elif key == u"tab":
643
 
                if self.topwidget.get_focus() is self.logbox:
644
 
                    self.topwidget.set_focus(0)
645
 
                else:
646
 
                    self.topwidget.set_focus(self.logbox)
647
 
                self.refresh()
648
 
            #elif (key == u"end" or key == u"meta >" or key == u"G"
649
 
            #      or key == u">"):
650
 
            #    pass            # xxx end-of-buffer
651
 
            #elif (key == u"home" or key == u"meta <" or key == u"g"
652
 
            #      or key == u"<"):
653
 
            #    pass            # xxx beginning-of-buffer
654
 
            #elif key == u"ctrl e" or key == u"$":
655
 
            #    pass            # xxx move-end-of-line
656
 
            #elif key == u"ctrl a" or key == u"^":
657
 
            #    pass            # xxx move-beginning-of-line
658
 
            #elif key == u"ctrl b" or key == u"meta (" or key == u"h":
659
 
            #    pass            # xxx left
660
 
            #elif key == u"ctrl f" or key == u"meta )" or key == u"l":
661
 
            #    pass            # xxx right
662
 
            #elif key == u"a":
663
 
            #    pass            # scroll up log
664
 
            #elif key == u"z":
665
 
            #    pass            # scroll down log
666
 
            elif self.topwidget.selectable():
667
 
                self.topwidget.keypress(self.size, key)
668
 
                self.refresh()
669
 
        return True
670
 
 
671
 
ui = UserInterface()
672
 
try:
673
 
    ui.run()
674
 
except KeyboardInterrupt:
675
 
    ui.screen.stop()
676
 
except Exception, e:
677
 
    ui.log_message(unicode(e))
678
 
    ui.screen.stop()
679
 
    raise