Welcome, guest | Sign In | My Account | Store | Cart

This script allows using twisted with wxPython at the same time without them stepping on each others toes. I'm so sorry for the messyness of it. I haven't found the time to tidy it up. The thing is it works, we use it in our kiosk administration program. <ad>http://www.sherborneinternational.com</ad>.

wxPython has its own main loop, twisted has its own main loop. wxreactor allows them to work together unless you want to use modal dialogs (and in my case didn't work on two linux machines with wx2.4). wxsupport is about the same, but didn't work on windows (with wx2.5) for me.

This solution is taken from itamar's suggestion in the twisted mailing list. Let each run in its own thread.

Python, 830 lines
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
"""This module enables wxPython and twisted to peacefully co-exist.

It does this by running wxPython in the main thread and starting a secondary thread for the twisted library.

It also provides a set of tools to enable communication between the two librarys

WARNING: DON'T use setTimeout on deferreds made/used in wx thread!
"""

import wx
from threading import Thread
from twisted.internet import reactor
from twisted.python import threadable
from twisted.internet.defer import maybeDeferred, Deferred
from time import sleep

# Make our own wxEvent for responding to messages
wxEVT_RESPONSE = wx.NewEventType()

class ResponseEvent(wx.PyCommandEvent):
    """This is our event used to pass net info
    (success, failure, progress, and status)
    to the gui"""

    def __init__(self, func, onSuccess, onFailure, *params, **kwparams):
        wx.PyCommandEvent.__init__(self, wxEVT_RESPONSE, 1)
        self.func = func
        self.onSuccess = onSuccess
        self.onFailure = onFailure
        self.params = params
        self.kwparams = kwparams


class TwistedThread(Thread):
    """Starts twisted in a secondary thread.
    It uses "commands" which are calls to the net thread from the gui thread
    and "responses" which are calls to the gui thread from the net thread
    but as both "commands" and "responses" have "onSuccess" and "onFailure"
    callbacks which must again cross the thread boundary, these are reversed
    so: A call from gui to net is a command, and its onSuccess call is a response
    but a call from net to gui is a "response" and its onSuccess call is a "command"
    so try not to get confused...
    """

    def __init__(self, app, twistedLogFileName=None):
        """'app' is a wx.App instance"""
        Thread.__init__(self)
        self.app = None
        self.twistedLogFileName = twistedLogFileName
        self.setApp(app)
        ThreadCommand.twistedThread = self
        if app:
            self.running = True
            self.start()

    def run(self):
        threadable.init(1)
        if self.twistedLogFileName:
            from twisted.python import log
            self.log = log
            self.log.startLogging(open(self.twistedLogFileName, 'w'), 0)
            self.log.msg('Started')
        reactor.run(installSignalHandlers=0)
        
    # Methods called from gui thread

    def stop(self):
        """Call to cleanup the reactor"""
        ThreadCommand((self._doStop, (), {}), self._onStopped, self._onStopFailed)
    
    def _onStopped(self, res):
        """Called once the reactor has stopped"""
        self.running = False
        
    def _onStopFailed(self, reason):
        self.running = False
        raise Exception('Could not stop reactor: %s' % reason)

    def setApp(self, app):
        """Call this first of all and every time you change
        your application object (like in some testing programs)
        It makes the app subscribe to our special events so that it can
        call your callback functions.
        """
        if app is not self.app:
            if self.app:
                self.app.Disconnect(1, 1, wxEVT_RESPONSE, self._runResponse)
            self.app = app
            self.app.Connect(1, 1, wxEVT_RESPONSE, self._runResponse)

    def runCommand(self, tc):
        """Called from the gui thread, pass a ThreadCommand instance to the
        network"""
        reactor.callFromThread(self._doRunCommand, tc)

    def _runResponse(self, evt):
        """Passes on a response from the net thread.
        Called from wx main loop on reception of an wxEVT_RESPONSE"""
        d = maybeDeferred(evt.func, *evt.params, **evt.kwparams)
        if evt.onSuccess:
            def onDone(r):
                simpleCommand((evt.onSuccess, (r,), {}))
            d.addCallback(onDone)
        if evt.onFailure:
            def onFail(r):
                simpleCommand((evt.onFailure, (r,), {}))
            d.addErrback(onFail)

    # Methods called from net thread
    
    def _doStop(self, tc):
        reactor.stop()

    def _doRunCommand(self, tc):
        """Called in the net thread to execute a gui command"""
        # Run the command and get a deferred
        if tc.passTC: d = maybeDeferred(tc.command[0], tc, *tc.command[1], **tc.command[2])
        else: d = maybeDeferred(tc.command[0], *tc.command[1], **tc.command[2])
        if tc.onSuccess: d.addCallback(self._success, tc)
        if tc.onFailure: d.addErrback(self._failure, tc)
        
    def _success(self, result, tc):
        """Called from the net thread. Appends a ThreadCommand
        success callback to the gui thread's queue"""
        if tc.param:
            evt = ResponseEvent(tc.onSuccess, None, None, tc.param, result)
        else:
            evt = ResponseEvent(tc.onSuccess, None, None, result)
        self.app.AddPendingEvent(evt)

    def _failure(self, reason, tc):
        """Called from the net thread. Appends a ThreadCommand
        failure callback to the gui thread's queue"""
        if tc.param:
            evt = ResponseEvent(tc.onFailure, None, None, tc.param, reason)
        else:
            evt = ResponseEvent(tc.onFailure, None, None, reason)
        self.app.AddPendingEvent(evt)


# Constants for ThreadCommand states
QUEUED, RUNNING, SUCCEEDED, FAILED, CANCELLED = 'queued', 'running', 'succeeded', 'failed', 'cancelled'

class ThreadCommand(object):
    """This object represents a command from the gui
    to the network library"""
    
    twistedThread = None # Filled when a TwistedThread instance is created

    def __init__(self, command, onSuccess, onFailure, param=None, onStatusReport=None, onProgressReport=None, onCustomReport=None, passTC=True):
        """'command' is a tuple containing a function reference, a sequence of parameters and a dictionary of parameters.
        The func will be called but the first arg will be 'self' (this ThreadCommand instance)
        'onSuccess' will be called passing 'param' and the result on success 
        'onFailure' will be called passing 'param' and an error message object on failure
        'param' is passed to all callback funcs, unless it is 'None'
        'onStatusReport' will be called passing a string for showing to the user along with param
        'onProgressReport' will be called passing a float between 0 and 100 along with param
        'onCustomReport' will be called with whatever params and kwparams the caller and server decide on,
        but the first param will be 'param'
        """
        self.command = command
        self.onStatusReport = onStatusReport
        self.onProgressReport = onProgressReport
        self.onSuccess = onSuccess
        self.onFailure = onFailure
        self.onCustomReport = onCustomReport
        self.param = param
        self.state = QUEUED
        self.passTC = passTC
        # Queue ourselves or...
        if self.twistedThread: self.twistedThread.runCommand(self)
        else:
            # Just run in current thread
            import pdb
            pdb.set_trace()
            try:
                if passTC: res = command[0](self, *command[1], **command[2])
                else: res = command[0](*command[1], **command[2])
            except Exception, e:
                if onFailure:
                    if param: onFailure(e, param)
                    else: onFailure(e)
                else:
                    if param: onFailure(e, param)
                    else: onFailure(e)
            if onSuccess:
                if isinstance(res, Deferred):
                    if param: res.addCallback(onSuccess, param)
                    else: res.addCallback(onSuccess)
                else:
                    if param: onSuccess(res, param)
                    else: onSuccess(res)

    
    # Methods called from the net thread
    
    def progressReport(self, done, outOf=100):
        """Passes on a progress report to the gui thread"""
        if self.param:
            if outOf == 100: evt = ResponseEvent(self.onProgressReport, None, None, float(done), self.param)
            else: evt = ResponseEvent(self.onProgressReport, None, None, (done/float(outOf))*100, self.param)
        else:
            if outOf == 100: evt = ResponseEvent(self.onProgressReport, None, None, float(done))
            else: evt = ResponseEvent(self.onProgressReport, None, None, (done/float(outOf))*100)
        self.twistedThread.app.AddPendingEvent(evt)
    
    def statusReport(self, msg):
        """Passes on a status message to the gui"""
        if self.param:
            evt = ResponseEvent(self.onStatusReport, None, None, msg, self.param)
        else:
            evt = ResponseEvent(self.onStatusReport, None, None, msg)
        self.twistedThread.app.AddPendingEvent(evt)
        
    def customReport(self, *params, **kwparams):
        """Passes on a custom event to the gui thread"""
        if self.param:
            evt = ResponseEvent(self.onCustomReport, None, None, self.param, *params, **kwparams)
        else:
            evt = ResponseEvent(self.onCustomReport, None, None, *params, **kwparams)            
        self.twistedThread.app.AddPendingEvent(evt)

def simpleCommand(command, onSuccess=None, onFailure=None, param=None, onStatusReport=None, onProgressReport=None, onCustomReport=None):
    """A convinience function to allow you to call net commands without having to pass a tc"""
    ThreadCommand(command, onSuccess, onFailure, param, onStatusReport, onProgressReport, onCustomReport, False)

def netCall(func, *params, **kwparams):
    """A nice wrapper function, returns a deferred.
    Lets you safely call a function in the net thread
    from the gui thread"""
    d = Deferred()
    simpleCommand((func, params, kwparams), d.callback, d.errback)
    return d
    
def makeNetSafe(func):
    """Makes NET function safe for calling from the GUI thread.
    Takes a func and returns a thread safe version of it
    for calling a net func from the gui func"""
    def result(*params, **kwparams):
        return netCall(func, *params, **kwparams)
    return result

def guiCall(func, *params, **kwparams):
    """Calls a gui func safely from the net thread"""
    d = Deferred()
    evt = ResponseEvent(func, d.callback, d.errback, *params, **kwparams)
    ThreadCommand.twistedThread.app.AddPendingEvent(evt)
    return d

def makeGuiSafe(func):
    """Makes a GUI function safe for calling from the NET thread.
    Returns a wrapper func that allows you to
    safely call the gui func 'func' from the net thread"""
    def result(*params, **kwparams):
        return guiCall(func, *params, **kwparams)
    return result


---------------- 8< -----------------------------
Chat example files
---------------- 8< -----------------------------
chatDemo.wxg - A wxGlade file, used to generate chatExampleGui.py
---------------- 8< -----------------------------

<?xml version="1.0"?>
<!-- generated by wxGlade 0.3.2 on Mon Jul 05 14:12:09 2004 -->

<application path="C:\work\play\chatExample\chatExampleGui.py" name="" class="" option="0" language="python" top_window="" encoding="ANSI_X3.4-1968" use_gettext="0" overwrite="0" use_new_namespace="1">
    <object class="ChatFrameGui" name="frmMain" base="EditFrame">
        <style>wxDEFAULT_FRAME_STYLE</style>
        <title>Chat</title>
        <statusbar>1</statusbar>
        <object class="wxStatusBar" name="frmMain_statusbar" base="EditStatusBar">
            <fields>
                <field width="-1">frmMain_statusbar</field>
            </fields>
        </object>
        <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">
            <orient>wxVERTICAL</orient>
            <object class="sizeritem">
                <flag>wxEXPAND</flag>
                <border>0</border>
                <option>1</option>
                <object class="wxPanel" name="panel_1" base="EditPanel">
                    <style>wxRAISED_BORDER|wxTAB_TRAVERSAL</style>
                    <object class="wxBoxSizer" name="sizer_3" base="EditBoxSizer">
                        <orient>wxVERTICAL</orient>
                        <object class="sizeritem">
                            <flag>wxEXPAND</flag>
                            <border>0</border>
                            <option>0</option>
                            <object class="wxPanel" name="panel_4" base="EditPanel">
                                <style>wxTAB_TRAVERSAL</style>
                                <object class="wxBoxSizer" name="sizer_4" base="EditBoxSizer">
                                    <orient>wxHORIZONTAL</orient>
                                    <object class="sizeritem">
                                        <flag>wxALL|wxALIGN_RIGHT|wxALIGN_CENTER_VERTICAL</flag>
                                        <border>3</border>
                                        <option>0</option>
                                        <object class="wxStaticText" name="lblIpAddress" base="EditStaticText">
                                            <attribute>1</attribute>
                                            <label>IP &amp;Address</label>
                                            <size>51, 13</size>
                                        </object>
                                    </object>
                                    <object class="sizeritem">
                                        <flag>wxALL|wxEXPAND</flag>
                                        <border>3</border>
                                        <option>1</option>
                                        <object class="wxTextCtrl" name="edtIPAddress" base="EditTextCtrl">
                                            <tooltip>The ip address or host name of a remote machine running chat</tooltip>
                                            <value>127.0.0.1</value>
                                        </object>
                                    </object>
                                    <object class="sizeritem">
                                        <flag>wxALL|wxEXPAND</flag>
                                        <border>3</border>
                                        <option>0</option>
                                        <object class="wxSpinCtrl" name="spnConnectPort" base="EditSpinCtrl">
                                            <style>wxSP_ARROW_KEYS|wxSP_WRAP</style>
                                            <tooltip>The port on which the remote chat program is listening</tooltip>
                                            <range>1, 65535</range>
                                            <value>8080</value>
                                        </object>
                                    </object>
                                    <object class="sizeritem">
                                        <flag>wxALL</flag>
                                        <border>3</border>
                                        <option>0</option>
                                        <object class="wxToggleButton" name="btnConnect" base="EditToggleButton">
                                            <label>&amp;Connect</label>
                                        </object>
                                    </object>
                                </object>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <flag>wxEXPAND</flag>
                            <border>0</border>
                            <option>0</option>
                            <object class="wxPanel" name="panel_3" base="EditPanel">
                                <style>wxTAB_TRAVERSAL</style>
                                <object class="wxBoxSizer" name="sizer_6" base="EditBoxSizer">
                                    <orient>wxHORIZONTAL</orient>
                                    <object class="sizeritem">
                                        <flag>wxALL|wxALIGN_RIGHT|wxALIGN_CENTER_VERTICAL</flag>
                                        <border>3</border>
                                        <option>0</option>
                                        <object class="wxStaticText" name="lblListenPort" base="EditStaticText">
                                            <attribute>1</attribute>
                                            <label>Listen &amp;on port</label>
                                            <size>64, 13</size>
                                        </object>
                                    </object>
                                    <object class="sizeritem">
                                        <flag>wxALL|wxEXPAND</flag>
                                        <border>3</border>
                                        <option>1</option>
                                        <object class="wxSpinCtrl" name="spnListenPort" base="EditSpinCtrl">
                                            <style>wxSP_ARROW_KEYS|wxSP_WRAP</style>
                                            <tooltip>The port on which to listen for incoming connections</tooltip>
                                            <range>1, 65535</range>
                                            <value>8080</value>
                                        </object>
                                    </object>
                                    <object class="sizeritem">
                                        <flag>wxALL</flag>
                                        <border>3</border>
                                        <option>0</option>
                                        <object class="wxToggleButton" name="btnListen" base="EditToggleButton">
                                            <tooltip>Listen for incoming connections</tooltip>
                                            <label>Lis&amp;ten</label>
                                        </object>
                                    </object>
                                </object>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <border>0</border>
                            <option>0</option>
                            <object class="wxStaticText" name="lblReceived" base="EditStaticText">
                                <attribute>1</attribute>
                                <label>Received</label>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <flag>wxEXPAND</flag>
                            <border>0</border>
                            <option>1</option>
                            <object class="wxTextCtrl" name="edtReceived" base="EditTextCtrl">
                                <foreground>#000000</foreground>
                                <style>wxTE_MULTILINE|wxTE_READONLY|wxTE_RICH2|wxTE_AUTO_URL</style>
                                <background>#c0c0c0</background>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <border>0</border>
                            <option>0</option>
                            <object class="wxStaticText" name="lblSent" base="EditStaticText">
                                <attribute>1</attribute>
                                <label>Sent:</label>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <flag>wxEXPAND</flag>
                            <border>0</border>
                            <option>1</option>
                            <object class="wxTextCtrl" name="edtSent" base="EditTextCtrl">
                                <style>wxTE_MULTILINE|wxTE_READONLY|wxTE_RICH2|wxTE_AUTO_URL</style>
                                <background>#c0c0c0</background>
                            </object>
                        </object>
                    </object>
                </object>
            </object>
            <object class="sizeritem">
                <flag>wxEXPAND</flag>
                <border>0</border>
                <option>0</option>
                <object class="wxPanel" name="panel_2" base="EditPanel">
                    <style>wxRAISED_BORDER|wxTAB_TRAVERSAL</style>
                    <object class="wxBoxSizer" name="sizer_2" base="EditBoxSizer">
                        <orient>wxHORIZONTAL</orient>
                        <object class="sizeritem">
                            <flag>wxALL|wxEXPAND</flag>
                            <border>5</border>
                            <option>1</option>
                            <object class="wxTextCtrl" name="edtToSend" base="EditTextCtrl">
                            </object>
                        </object>
                        <object class="sizeritem">
                            <flag>wxALL</flag>
                            <border>4</border>
                            <option>0</option>
                            <object class="wxButton" name="btnSend" base="EditButton">
                                <default>1</default>
                                <label>&amp;Send</label>
                            </object>
                        </object>
                        <object class="sizeritem">
                            <flag>wxALL</flag>
                            <border>4</border>
                            <option>0</option>
                            <object class="wxButton" name="btnClose" base="EditButton">
                                <label>&amp;Close</label>
                            </object>
                        </object>
                    </object>
                </object>
            </object>
        </object>
    </object>
</application>
---------------- 8< -----------------------------
chatExampleGui.py - The wx bits
---------------- 8< -----------------------------
#!/usr/bin/env python
# generated by wxGlade 0.3.2 on Sun Jul  4 09:38:17 2004

import wx

class ChatFrameGui(wx.Frame):
    def __init__(self, *args, **kwds):
        # begin wxGlade: ChatFrameGui.__init__
        kwds["style"] = wx.DEFAULT_FRAME_STYLE
        wx.Frame.__init__(self, *args, **kwds)
        self.panel_2 = wx.Panel(self, -1, style=wx.RAISED_BORDER|wx.TAB_TRAVERSAL)
        self.panel_1 = wx.Panel(self, -1, style=wx.RAISED_BORDER|wx.TAB_TRAVERSAL)
        self.panel_3 = wx.Panel(self.panel_1, -1)
        self.panel_4 = wx.Panel(self.panel_1, -1)
        self.frmMain_statusbar = self.CreateStatusBar(1)
        self.lblIpAddress = wx.StaticText(self.panel_4, -1, "IP &Address")
        self.edtIPAddress = wx.TextCtrl(self.panel_4, -1, "127.0.0.1")
        self.spnConnectPort = wx.SpinCtrl(self.panel_4, -1, "8080", min=1, max=65535, style=wx.SP_ARROW_KEYS|wx.SP_WRAP)
        self.btnConnect = wx.ToggleButton(self.panel_4, -1, "&Connect")
        self.lblListenPort = wx.StaticText(self.panel_3, -1, "Listen &on port")
        self.spnListenPort = wx.SpinCtrl(self.panel_3, -1, "8080", min=1, max=65535, style=wx.SP_ARROW_KEYS|wx.SP_WRAP)
        self.btnListen = wx.ToggleButton(self.panel_3, -1, "Lis&ten")
        self.lblReceived = wx.StaticText(self.panel_1, -1, "Received")
        self.edtReceived = wx.TextCtrl(self.panel_1, -1, "", style=wx.TE_MULTILINE|wx.TE_READONLY|wx.TE_RICH2|wx.TE_AUTO_URL)
        self.lblSent = wx.StaticText(self.panel_1, -1, "Sent:")
        self.edtSent = wx.TextCtrl(self.panel_1, -1, "", style=wx.TE_MULTILINE|wx.TE_READONLY|wx.TE_RICH2|wx.TE_AUTO_URL)
        self.edtToSend = wx.TextCtrl(self.panel_2, -1, "")
        self.btnSend = wx.Button(self.panel_2, -1, "&Send")
        self.btnClose = wx.Button(self.panel_2, -1, "&Close")

        self.__set_properties()
        self.__do_layout()
        # end wxGlade

    def __set_properties(self):
        # begin wxGlade: ChatFrameGui.__set_properties
        self.SetTitle("Chat")
        self.frmMain_statusbar.SetStatusWidths([-1])
        # statusbar fields
        frmMain_statusbar_fields = ["frmMain_statusbar"]
        for i in range(len(frmMain_statusbar_fields)):
            self.frmMain_statusbar.SetStatusText(frmMain_statusbar_fields[i], i)
        self.lblIpAddress.SetSize((51, 13))
        self.edtIPAddress.SetToolTipString("The ip address or host name of a remote machine running chat")
        self.spnConnectPort.SetToolTipString("The port on which the remote chat program is listening")
        self.lblListenPort.SetSize((64, 13))
        self.spnListenPort.SetToolTipString("The port on which to listen for incoming connections")
        self.btnListen.SetToolTipString("Listen for incoming connections")
        self.edtReceived.SetBackgroundColour(wx.Colour(192, 192, 192))
        self.edtReceived.SetForegroundColour(wx.Colour(0, 0, 0))
        self.edtSent.SetBackgroundColour(wx.Colour(192, 192, 192))
        self.btnSend.SetDefault()
        # end wxGlade

    def __do_layout(self):
        # begin wxGlade: ChatFrameGui.__do_layout
        sizer_1 = wx.BoxSizer(wx.VERTICAL)
        sizer_2 = wx.BoxSizer(wx.HORIZONTAL)
        sizer_3 = wx.BoxSizer(wx.VERTICAL)
        sizer_6 = wx.BoxSizer(wx.HORIZONTAL)
        sizer_4 = wx.BoxSizer(wx.HORIZONTAL)
        sizer_4.Add(self.lblIpAddress, 0, wx.ALL|wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL, 3)
        sizer_4.Add(self.edtIPAddress, 1, wx.ALL|wx.EXPAND, 3)
        sizer_4.Add(self.spnConnectPort, 0, wx.ALL|wx.EXPAND, 3)
        sizer_4.Add(self.btnConnect, 0, wx.ALL, 3)
        self.panel_4.SetAutoLayout(1)
        self.panel_4.SetSizer(sizer_4)
        sizer_4.Fit(self.panel_4)
        sizer_4.SetSizeHints(self.panel_4)
        sizer_3.Add(self.panel_4, 0, wx.EXPAND, 0)
        sizer_6.Add(self.lblListenPort, 0, wx.ALL|wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL, 3)
        sizer_6.Add(self.spnListenPort, 1, wx.ALL|wx.EXPAND, 3)
        sizer_6.Add(self.btnListen, 0, wx.ALL, 3)
        self.panel_3.SetAutoLayout(1)
        self.panel_3.SetSizer(sizer_6)
        sizer_6.Fit(self.panel_3)
        sizer_6.SetSizeHints(self.panel_3)
        sizer_3.Add(self.panel_3, 0, wx.EXPAND, 0)
        sizer_3.Add(self.lblReceived, 0, 0, 0)
        sizer_3.Add(self.edtReceived, 1, wx.EXPAND, 0)
        sizer_3.Add(self.lblSent, 0, 0, 0)
        sizer_3.Add(self.edtSent, 1, wx.EXPAND, 0)
        self.panel_1.SetAutoLayout(1)
        self.panel_1.SetSizer(sizer_3)
        sizer_3.Fit(self.panel_1)
        sizer_3.SetSizeHints(self.panel_1)
        sizer_1.Add(self.panel_1, 1, wx.EXPAND, 0)
        sizer_2.Add(self.edtToSend, 1, wx.ALL|wx.EXPAND, 5)
        sizer_2.Add(self.btnSend, 0, wx.ALL, 4)
        sizer_2.Add(self.btnClose, 0, wx.ALL, 4)
        self.panel_2.SetAutoLayout(1)
        self.panel_2.SetSizer(sizer_2)
        sizer_2.Fit(self.panel_2)
        sizer_2.SetSizeHints(self.panel_2)
        sizer_1.Add(self.panel_2, 0, wx.EXPAND, 0)
        self.SetAutoLayout(1)
        self.SetSizer(sizer_1)
        sizer_1.Fit(self)
        sizer_1.SetSizeHints(self)
        self.Layout()
        # end wxGlade

# end of class ChatFrameGui
---------------- 8< -----------------------------
chatExample.py - Notice the various different uses of the library.
Refer to comment above for easiest use (makeNetSafe, netCall, makeGuiSafe, guiCall). guiCall is not tested, haven't needed to use it yet.
---------------- 8< -----------------------------
import wx
from chatExampleGui import ChatFrameGui
from guinet import TwistedThread, ThreadCommand, netCall, makeNetSafe, guiCall, makeGuiSafe
from wxPython.lib.evtmgr import eventManager
from twisted.protocols.basic import LineReceiver
from twisted.internet.protocol import Factory, ClientFactory
from twisted.internet import reactor
from twisted.internet.defer import Deferred
from twisted.python.failure import Failure

###############################################################################
## Classes that run in the net thread #########################################
###############################################################################

class ChatProtocol(LineReceiver):

    def __init__(self):
        self.setLineMode()


    def dataReceived(self, data):
        LineReceiver.dataReceived(self, data)

    def lineReceived(self, line):
        self.factory.onLine(line)

class ChatFactory(Factory):
    
    protocol = ChatProtocol
    
    def __init__(self, tc, onConnectionMade, onLine):
        self.tc = tc
        self.onConnectionMade = onConnectionMade
        self.onLine = onLine
        
    def buildProtocol(self, addr):
        p = ChatProtocol()
        p.factory = self
        self.onConnectionMade(p, addr)
        return p
    
class ChatClientFactory(ClientFactory):
    
    def __init__(self, deferred, tc, onConnectionMade):
        self.tc = tc
        self.deferred = deferred
        self.onConnectionMade = onConnectionMade
    
    def startedConnecting(self, connector):
        self.tc.customReport('Started to connect.')
    
    def buildProtocol(self, addr):
        p = ChatProtocol()
        p.factory = self
        self.deferred.callback('Connected')
        self.onConnectionMade(p)
        return p
    
    def clientConnectionLost(self, connector, reason):
        self.tc.customReport('Lost connection.  Reason: %s' % reason)
    
    def clientConnectionFailed(self, connector, reason):
        self.deferred.errback(Failure('Connection failed. Reason: %s' % reason))
        
    def onLine(self, line):
        self.tc.statusReport(line)


###############################################################################
## Classes that run in the gui thread #########################################
###############################################################################

class ChatServer(object):
    """This object is created in the gui thread
    and allows for communication between the threads"""
    
    def __init__(self, app, onStarted, onFailed, onLine, onMsg):
        self.app = app
        self.onStarted = onStarted
        self.onFailed = onFailed
        self.onLine = onLine
        self.onMsg = onMsg
        self.started = False

    def start(self, port):
        ThreadCommand((self._doStart, [port], {}),
                      self.onStarted, self.onFailed, onStatusReport=self.onLine,
                      onCustomReport=self.onMsg)
        self.started = True

    def stop(self, onStopped, onFail):
        ThreadCommand((self._doStop, (), {}), onStopped, onFail)
        self.started = False

    def send(self, line):
        """Sends a line to the other end"""
        return self.connection.transport.write(str(line) + '\r\n')
    # This is soooo coool. Just call self.send from the gui
    # and your data is sent. (it returns a deferred by the way)
    send = makeNetSafe(send)

    # Methods called from net thread
    
    def _doStart(self, tc, port):
        """Starts the factory"""
        self.factory = ChatFactory(tc, self._doOnConnectionMade, self._doOnLine)
        self.port = reactor.listenTCP(int(port), self.factory)
        
    def _doStop(self, tc):
        """Stops listening"""
        self.port.stopListening()
        
    def _doOnConnectionMade(self, connection, addr):
        """Receives an instance of 'ChatProtocol' for each incoming connection"""
        self.connection = connection  # We only really handle one connection at a time
        guiCall(self.onMsg, 'Connection from %s' % addr)
        
    def _doOnLine(self, line):
        """Passes the on line received event to the gui"""
        self.factory.tc.statusReport(line)


class ChatClient(object):
    """A nice interface to be used from the gui"""

    # Methods called in the gui thread
    
    def connect(self, server, port, onSuccess, onFailure, onLine, onMsg):
        ThreadCommand((self._doConnect, (server, port), {}), onSuccess, onFailure, onStatusReport=onLine, onCustomReport=onMsg)
        
    def disconnect(self, onDone, onErr):
        ThreadCommand((self._doDisconnect, (), {}), onDone, onErr)

    def send(self, line):
        """Sends the line"""
        return netCall(self._doSend, line)

    # Methods called in the net thread
    
    def _doConnect(self, tp, server, port):
        d = Deferred()
        self.factory = ChatClientFactory(d, tp, self.onConnectionMade)
        self.connector = reactor.connectTCP(server, int(port), self.factory)
        return d
        
    def _doDisconnect(self, tp):
        return self.connector.disconnect()

    def _doSend(self, line):
        self.connection.transport.write(str(line) + '\r\n')

    def onConnectionMade(self, connection):
        """Called once we have connected."""
        self.connection = connection

class ChatFrame(ChatFrameGui):
    
    def __init__(self):
        ChatFrameGui.__init__(self, None, -1, 'Chat')
        self._assignEvents()
        self.server = ChatServer(wx.GetApp(), self.onServerStarted, self.onServerFailed, self.onLine, self.onMsg)
        self.client = ChatClient()
        
    def _assignEvents(self):
        eventManager.Register(self.onListen, wx.EVT_TOGGLEBUTTON, self.btnListen)
        eventManager.Register(self.onConnect, wx.EVT_TOGGLEBUTTON, self.btnConnect)
        eventManager.Register(lambda e: self.Close(), wx.EVT_BUTTON, self.btnClose)
        eventManager.Register(self.onSend, wx.EVT_BUTTON, self.btnSend)
        
    # Event handlers for gui framework
        
    def onListen(self, evt):
        """Starts or stops listening"""
        if evt.Checked():
            self.server.start(self.spnListenPort.GetValue())
        else:
            self.server.stop(self.onServerStopped, self.onServerFailed)
    
    def onConnect(self, evt):
        """Called from connect button. Connects to a server"""
        if evt.Checked():
            self.client.connect(self.edtIPAddress.GetValue(), self.spnConnectPort.GetValue(),
                                self.onClientConnected, self.onClientFailed, self.onLine,
                                self.onClientMsg)
        else:
            self.client.disconnect(lambda tc: self.onClientMsg('Client disconnected'), self.onClientFailed)
    
    def onSend(self, evt):
        """Sends the stuff in edtToSend"""
        line = self.edtToSend.GetValue()
        if not line: return
        if self.server.started:
            d = self.server.send(line)
        else:
            d = self.client.send(line)
        d.addCallback(self.onSent, line)
        d.addErrback(self.onSendFailed, line)
        self.edtToSend.SetValue('')
        self.edtToSend.SetFocus()

    def onSent(self, result, line):
        """Called once some text has been succesfully sent"""
        self.edtSent.AppendText(line + '\n')

    def onSendFailed(self, reason, line):
        """Called if a send failed"""
        wx.MessageBox(str(reason), 'Could not send %s' % line, wx.OK|wx.ICON_ERROR, self)

    # Event handlers for net framework
        
    def onServerStarted(self, server):
        """Called once the server has started listening"""
        self.GetStatusBar().SetStatusText('Server started')
        
    def onServerStopped(self, server):
        """The server has been stopped by the user"""
        self.GetStatusBar().SetStatusText('Server stopped')
        
    def onServerFailed(self, reason):
        """Called if the server can't listen"""
        self.btnListen.SetValue(False)
        wx.MessageBox(reason, 'Server Failed', wx.OK|wx.ICON_ERROR, self)
        self.GetStatusBar().SetStatusText('Server failed: %s' % reason)
        
    def onClientConnected(self, c):
        self.GetStatusBar().SetStatusText('Client Connected')
        
    def onClientFailed(self, reason):
        self.btnConnect.SetValue(False)
        wx.MessageBox(str(reason), 'Client Connection Failed', wx.OK|wx.ICON_ERROR, self)
        self.GetStatusBar().SetStatusText('Client Connection Failed: %s' % reason)
        
    def onClientMsg(self, msg, extra=None):
        if isinstance(msg, Failure):
            msg = msg.getErrorMessage()
        self.GetStatusBar().SetStatusText(msg)
        
    def onLine(self, line):
        """Called when a line is received from the other end"""
        self.edtReceived.AppendText(line + '\n')
    
    def onMsg(self, msg):
        """Called when the server has a message for us"""
        self.GetStatusBar().SetStatusText(msg)


class App(wx.App):
    
    def OnInit(self):
        self.twistedThread = TwistedThread(self, 'twistd.log')
        #self.twistedThread = TwistedThread(self)
        from twisted.internet.defer import Deferred
        Deferred.debug = 1
        self.main = ChatFrame()
        eventManager.Register(self.onClose, wx.EVT_CLOSE, self.main)
        self.main.Show()
        return True
    
    def onClose(self, evt):
        """Stops the twisted threads"""
        self.twistedThread.stop()
        evt.Skip()


if __name__ == '__main__':
    a = App(0)
    a.MainLoop()

wx runs in the main thread and starts twisted reactor in a secondary thread. Methods are called cross thread by posting messages/events on each main loop's event queue. wx uses wxEvents and twisted uses CallFromThread (thanks again to itamar and

twisted (irc.freenode.net).

We also supply a little framework for inter-thread communication. The easiest way to use it is to have your twisted object use makeNetSafe (meaning make this net thread func safe to be called from the gui thread). Use like this:

class SomeTwistedThing(Protocol):

def doSomeNetThing(self):
    d = self.transport.write(self.somedata)
    return d
doSomeNetThing = makeNetSafe(doSomeNetThing)

Note the indentation, we are replacing the class function with one that can be called from either the gui thread or the net thread (if a TwistedThread instance doesn't exist), it still returns a deferred and you can add callbacks and everything. Deferreds running in the gui thread don't support setTimeOut (as that relies on the reactor); you can make your own using a wxTimer or something if you need it.

If netCall and guiCall use maybeDeferred, so if the function just returns a result, it will be hopped to the other thread, if the function raises an exception, the errBack will be called (in the other thread).

Let me share one thing about deferreds that I learned while writing this. If the function fails and your errback is called, the other errbacks wont chain unless you return a Failure instance. If your errback handler doesn't return a Failure instance, the next thing to be called in the chain will be a callback.

Originally the code was made for uploading and downloading stuff, hence the StatusReport, ProgressReport, etc methods. Feel free to use them if you want too.

May God bless you and your family as you try to please Him.

8 comments

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

Don't be scared. Don't be scared off by the size. There's a whole demo app in there.

Look for -------------------- 8< ------------------

for between file cuts...

Comments appreciated

Christian Wilcox 19 years, 9 months ago  # | flag

guinet module? I'm unable to locate information on the guinet module... am I missing something?

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

guinet.py. Sorry, there are like three or four files in the recipe. The first file is guinet.py.

Each file is separated with a line break: -----------------8<------------------------

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

I've update guinet.py.

"""This module enables wxPython and twisted to peacefully co-exist.

It does this by running wxPython in the main thread and starting a secondary thread for the twisted library.

It also provides a set of tools to enable communication between the two librarys

WARNING: DON'T use setTimeout on deferreds made/used in wx thread!
"""

# Imports
import wx
from threading import Thread, Event
from twisted.internet import reactor
from twisted.python import threadable
from twisted.internet.defer import maybeDeferred, Deferred
from twisted.trial.util import deferredResult
from time import sleep


# Make our own wxEvent for responding to messages
wxEVT_RESPONSE = wx.NewEventType()

class ResponseEvent(wx.PyCommandEvent):
    """This is our event used to pass net info
    (success, failure, progress, and status)
    to the gui"""

    def __init__(self, func, onSuccess, onFailure, *params, **kwparams):
        wx.PyCommandEvent.__init__(self, wxEVT_RESPONSE, 1)
        self.func = func
        self.onSuccess = onSuccess
        self.onFailure = onFailure
        self.params = params
        self.kwparams = kwparams


class TwistedThread(Thread):
    """Starts twisted in a secondary thread.
    It uses "commands" which are calls to the net thread from the gui thread
    and "responses" which are calls to the gui thread from the net thread
    but as both "commands" and "responses" have "onSuccess" and "onFailure"
    callbacks which must again cross the thread boundary, these are reversed
    so: A call from gui to net is a command, and its onSuccess call is a response
    but a call from net to gui is a "response" and its onSuccess call is a "command"
    so try not to get confused...
    """

    def __init__(self, app, twistedLogFileName=None, block=True):
        """'app' is a wx.App instance
        'twistedLogFileName' is the filename for twisted to log to. If ommited will log to stderr
        'block' means wait until the reactor is actually running before returning"""
        Thread.__init__(self)
        self.app = None
        self.twistedLogFileName = twistedLogFileName
        self.block = block
        self.setApp(app)
        ThreadCommand.twistedThread = self
        if app: self.start()

    def start(self):
        """Start the twisted reactor running in a different thread"""
        if self.block:
            self.startEvent = Event()
            Thread.start(self)
            self.startEvent.wait()
        else:
            Thread.start(self)

(comment continued...)

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

(...continued from previous comment)

    def run(self):
        threadable.init(1)
        if self.twistedLogFileName:
            from twisted.python import log
            self.log = log
            self.log.startLogging(open(self.twistedLogFileName, 'w'), 0)
            self.log.msg('Starting...')
        reactor.callLater(0, self._onStart)
        reactor.run(installSignalHandlers=0)

    def _onStart(self):
        """Called once the reactor is actually running"""
        self.running = True
        if self.log: self.log.msg('Started')
        if self.block:
            self.startEvent.set()

    # Methods called from gui thread

    def stop(self):
        """Call to cleanup the reactor"""
        ThreadCommand((self._doStop, (), {}), self._onStopped, self._onStopFailed)

    def _onStopped(self, res):
        """Called once the reactor has stopped"""
        self.running = False

    def _onStopFailed(self, reason):
        self.running = False
        raise Exception('Could not stop reactor: %s' % reason)

    def setApp(self, app):
        """Call this first of all and every time you change
        your application object (like in some testing programs)
        It makes the app subscribe to our special events so that it can
        call your callback functions.
        """
        if app is not self.app:
            if self.app:
                self.app.Disconnect(1, 1, wxEVT_RESPONSE, self._doRunResponse)
            self.app = app
            self.app.Connect(1, 1, wxEVT_RESPONSE, self._doRunResponse)

    def runCommand(self, tc):
        """Called from the gui thread, pass a ThreadCommand instance to the
        network"""
        reactor.callFromThread(self._doRunCommand, tc)

    def _doRunResponse(self, evt):
        """Passes on a response from the net thread.
        Called from wx main loop on reception of an wxEVT_RESPONSE"""
        d = maybeDeferred(evt.func, *evt.params, **evt.kwparams)
        if evt.onSuccess:
            def onDone(r):
                simpleCommand((evt.onSuccess, (r,), {}))
            d.addCallback(onDone)
        if evt.onFailure:
            def onFail(r):
                simpleCommand((evt.onFailure, (r,), {}))
            d.addErrback(onFail)

    # Methods called from net thread

    def _doStop(self, tc):
        reactor.stop()

(comment continued...)

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

(...continued from previous comment)

    def _doRunCommand(self, tc):
        """Called in the net thread to execute a gui command"""
        # Run the command and get a deferred
        if tc.passTC: d = maybeDeferred(tc.command[0], tc, *tc.command[1], **tc.command[2])
        else: d = maybeDeferred(tc.command[0], *tc.command[1], **tc.command[2])
        if tc.onSuccess: d.addCallback(self._success, tc)
        if tc.onFailure: d.addErrback(self._failure, tc)

    def _success(self, result, tc):
        """Called from the net thread. Appends a ThreadCommand
        success callback to the gui thread's queue"""
        if tc.param:
            evt = ResponseEvent(tc.onSuccess, None, None, tc.param, result)
        else:
            evt = ResponseEvent(tc.onSuccess, None, None, result)
        self.app.AddPendingEvent(evt)

    def _failure(self, reason, tc):
        """Called from the net thread. Appends a ThreadCommand
        failure callback to the gui thread's queue"""
        if tc.param:
            evt = ResponseEvent(tc.onFailure, None, None, tc.param, reason)
        else:
            evt = ResponseEvent(tc.onFailure, None, None, reason)
        self.app.AddPendingEvent(evt)


# Constants for ThreadCommand states
QUEUED, RUNNING, SUCCEEDED, FAILED, CANCELLED = 'queued', 'running', 'succeeded', 'failed', 'cancelled'

class ThreadCommand(object):
    """This object represents a command from the gui
    to the network library"""

    twistedThread = None # Filled when a TwistedThread instance is created

    def __init__(self, command, onSuccess, onFailure, param=None, onStatusReport=None, onProgressReport=None, onCustomReport=None, passTC=True):
        """'command' is a tuple containing a function reference, a sequence of parameters and a dictionary of parameters.
        The func will be called but the first arg will be 'self' (this ThreadCommand instance)
        'onSuccess' will be called passing 'param' and the result on success
        'onFailure' will be called passing 'param' and an error message object on failure
        'param' is passed to all callback funcs, unless it is 'None'
        'onStatusReport' will be called passing a string for showing to the user along with param
        'onProgressReport' will be called passing a float between 0 and 100 along with param
        'onCustomReport' will be called with whatever params and kwparams the caller and server decide on,
        but the first param will be 'param'
        """
        self.command = command
        self.onStatusReport = onStatusReport
        self.onProgressReport = onProgressReport
        self.onSuccess = onSuccess
        self.onFailure = onFailure
        self.onCustomReport = onCustomReport

(comment continued...)

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

(...continued from previous comment)

        self.param = param
        self.state = QUEUED
        self.passTC = passTC
        # Queue ourselves or...
        if self.twistedThread: self.twistedThread.runCommand(self)
        else:
            # Just run in current thread
            try:
                if passTC: res = command[0](self, *command[1], **command[2])
                else: res = command[0](*command[1], **command[2])
            except Exception, e:
                if onFailure:
                    if param: onFailure(e, param)
                    else: onFailure(e)
                else:
                    if param: onFailure(e, param)
                    else: onFailure(e)
            if onSuccess:
                if isinstance(res, Deferred):
                    if param: res.addCallback(onSuccess, param)
                    else: res.addCallback(onSuccess)
                else:
                    if param: onSuccess(res, param)
                    else: onSuccess(res)


    # Methods called from the net thread

    def progressReport(self, done, outOf=100):
        """Passes on a progress report to the gui thread"""
        if self.param:
            if outOf == 100: evt = ResponseEvent(self.onProgressReport, None, None, float(done), self.param)
            else: evt = ResponseEvent(self.onProgressReport, None, None, (done/float(outOf))*100, self.param)
        else:
            if outOf == 100: evt = ResponseEvent(self.onProgressReport, None, None, float(done))
            else: evt = ResponseEvent(self.onProgressReport, None, None, (done/float(outOf))*100)
        self.twistedThread.app.AddPendingEvent(evt)

    def statusReport(self, msg):
        """Passes on a status message to the gui"""
        if self.param:
            evt = ResponseEvent(self.onStatusReport, None, None, msg, self.param)
        else:
            evt = ResponseEvent(self.onStatusReport, None, None, msg)
        self.twistedThread.app.AddPendingEvent(evt)

    def customReport(self, *params, **kwparams):
        """Passes on a custom event to the gui thread"""
        if self.param:
            evt = ResponseEvent(self.onCustomReport, None, None, self.param, *params, **kwparams)
        else:
            evt = ResponseEvent(self.onCustomReport, None, None, *params, **kwparams)
        self.twistedThread.app.AddPendingEvent(evt)

def simpleCommand(command, onSuccess=None, onFailure=None, param=None, onStatusReport=None, onProgressReport=None, onCustomReport=None):
    """A convinience function to allow you to call net commands without having to pass a tc"""
    ThreadCommand(command, onSuccess, onFailure, param, onStatusReport, onProgressReport, onCustomReport, False)

(comment continued...)

Matthew Sherborne (author) 19 years, 9 months ago  # | flag

(...continued from previous comment)

def netCall(func, *params, **kwparams):
    """A nice wrapper function, returns a deferred.
    Lets you safely call a function in the net thread
    from the gui thread"""
    d = Deferred()
    simpleCommand((func, params, kwparams), d.callback, d.errback)
    return d

def netCall2(func, *params, **kwparams):
    """Like netCall but blocks and returns the actual result
    (uses deferredResult)"""
    return deferredResult(netCall(func, *params, **kwparams))

def makeNetSafe(func):
    """Makes NET function safe for calling from the GUI thread.
    Takes a func and returns a thread safe version of it
    for calling a net func from the gui func"""
    def result(*params, **kwparams):
        return netCall(func, *params, **kwparams)
    return result

def guiCall(func, *params, **kwparams):
    """Calls a gui func safely from the net thread"""
    d = Deferred()
    evt = ResponseEvent(func, d.callback, d.errback, *params, **kwparams)
    ThreadCommand.twistedThread.app.AddPendingEvent(evt)
    return d

def guiCall2(func, *params, **kwparams):
    """Like guiCall but blocks and returns the actual result
    (uses deferredResult)"""
    return deferredResult(guiCall(func, *params, **kwparams))

def makeGuiSafe(func):
    """Makes a GUI function safe for calling from the NET thread.
    Returns a wrapper func that allows you to
    safely call the gui func 'func' from the net thread"""
    def result(*params, **kwparams):
        return guiCall(func, *params, **kwparams)
    return result
Created by Matthew Sherborne on Tue, 6 Jul 2004 (PSF)
Python recipes (4591)
Matthew Sherborne's recipes (2)

Required Modules

  • (none specified)

Other Information and Tasks