aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
blob: e6ec0e1867aec577d56f3ccbe299209345617490 (plain)
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
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Lifetime;
using System.Security.Policy;
using System.Text;
using System.Threading;
using System.Xml;
using OpenMetaverse;
using log4net;
using Nini.Config;
using Amib.Threading;
using OpenSim.Framework;
using OpenSim.Region.CoreModules;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.ScriptEngine.Shared;
using OpenSim.Region.ScriptEngine.Shared.Api;
using OpenSim.Region.ScriptEngine.Shared.Api.Runtime;
using OpenSim.Region.ScriptEngine.Shared.ScriptBase;
using OpenSim.Region.ScriptEngine.Shared.CodeTools;
using OpenSim.Region.ScriptEngine.Interfaces;

namespace OpenSim.Region.ScriptEngine.Shared.Instance
{
    public class ScriptInstance : MarshalByRefObject, IScriptInstance
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// The current work item if an event for this script is running or waiting to run,
        /// </summary>
        /// <remarks>
        /// Null if there is no running or waiting to run event.  Must be changed only under an EventQueue lock.
        /// </remarks>
        private IScriptWorkItem m_CurrentWorkItem;

        private IScript m_Script;
        private DetectParams[] m_DetectParams;
        private bool m_TimerQueued;
        private DateTime m_EventStart;
        private bool m_InEvent;
        private string m_Assembly;
        private string m_CurrentEvent = String.Empty;
        private bool m_InSelfDelete;
        private int m_MaxScriptQueue;
        private bool m_SaveState = true;
        private int m_ControlEventsInQueue;
        private int m_LastControlLevel;
        private bool m_CollisionInQueue;

        // The following is for setting a minimum delay between events
        private double m_minEventDelay;
        
        private long m_eventDelayTicks;
        private long m_nextEventTimeTicks;
        private bool m_startOnInit = true;
        private UUID m_AttachedAvatar;
        private StateSource m_stateSource;
        private bool m_postOnRez;
        private bool m_startedFromSavedState;
        private UUID m_CurrentStateHash;
        private UUID m_RegionID;

        public int DebugLevel { get; set; }

        public Dictionary<KeyValuePair<int, int>, KeyValuePair<int, int>> LineMap { get; set; }

        private Dictionary<string,IScriptApi> m_Apis = new Dictionary<string,IScriptApi>();

        public Object[] PluginData = new Object[0];

        /// <summary>
        /// Used by llMinEventDelay to suppress events happening any faster than this speed.
        /// This currently restricts all events in one go. Not sure if each event type has
        /// its own check so take the simple route first.
        /// </summary>
        public double MinEventDelay
        {
            get { return m_minEventDelay; }
            set
            {
                if (value > 0.001)
                    m_minEventDelay = value;
                else 
                    m_minEventDelay = 0.0;

                m_eventDelayTicks = (long)(m_minEventDelay * 10000000L);
                m_nextEventTimeTicks = DateTime.Now.Ticks;
            }
        }

        public bool Running { get; set; }

        public bool Suspended
        {
            get { return m_Suspended; }

            set
            {
                // Need to do this inside a lock in order to avoid races with EventProcessor()
                lock (m_Script)
                {
                    bool wasSuspended = m_Suspended;
                    m_Suspended = value;
    
                    if (wasSuspended && !m_Suspended)
                    {
                        lock (EventQueue)
                        {
                            // Need to place ourselves back in a work item if there are events to process
                            if (EventQueue.Count > 0 && Running && !ShuttingDown)
                                m_CurrentWorkItem = Engine.QueueEventHandler(this);
                        }
                    }
                }
            }
        }
        private bool m_Suspended;

        public bool ShuttingDown { get; set; }

        public string State { get; set; }

        public IScriptEngine Engine { get; private set; }

        public UUID AppDomain { get; set; }

        public SceneObjectPart Part { get; private set; }

        public string PrimName { get; private set; }

        public string ScriptName { get; private set; }

        public UUID ItemID { get; private set; }

        public UUID ObjectID { get { return Part.UUID; } }

        public uint LocalID { get { return Part.LocalId; } }

        public UUID RootObjectID { get { return Part.ParentGroup.UUID; } }

        public uint RootLocalID { get { return Part.ParentGroup.LocalId; } }

        public UUID AssetID { get; private set; }

        public Queue EventQueue { get; private set; }

        public long EventsQueued
        {
            get 
            {
                lock (EventQueue)
                    return EventQueue.Count;
            }   
        }

        public long EventsProcessed { get; private set; }

        public int StartParam { get; set; }

        public TaskInventoryItem ScriptTask { get; private set; }

        public DateTime TimeStarted { get; private set; }

        public long MeasurementPeriodTickStart { get; private set; }

        public long MeasurementPeriodExecutionTime { get; private set; }

        public static readonly long MaxMeasurementPeriod = 30 * TimeSpan.TicksPerMinute;

        private bool m_coopTermination;
 
        private EventWaitHandle m_coopSleepHandle;

        public void ClearQueue()
        {
            m_TimerQueued = false;
            EventQueue.Clear();
        }

        public ScriptInstance(
            IScriptEngine engine, SceneObjectPart part, TaskInventoryItem item,
            int startParam, bool postOnRez,
            int maxScriptQueue)
        {
            State = "default";
            EventQueue = new Queue(32);

            Engine = engine;
            Part = part;
            ScriptTask = item;

            // This is currently only here to allow regression tests to get away without specifying any inventory
            // item when they are testing script logic that doesn't require an item.
            if (ScriptTask != null)
            {
                ScriptName = ScriptTask.Name;
                ItemID = ScriptTask.ItemID;
                AssetID = ScriptTask.AssetID;
            }

            PrimName = part.ParentGroup.Name;
            StartParam = startParam;
            m_MaxScriptQueue = maxScriptQueue;
            m_postOnRez = postOnRez;
            m_AttachedAvatar = Part.ParentGroup.AttachedAvatar;
            m_RegionID = Part.ParentGroup.Scene.RegionInfo.RegionID;

            if (Engine.Config.GetString("ScriptStopStrategy", "abort") == "co-op")
            {
                m_coopTermination = true;
                m_coopSleepHandle = new AutoResetEvent(false);
            }
        }

        /// <summary>
        /// Load the script from an assembly into an AppDomain.
        /// </summary>
        /// <param name='dom'></param>
        /// <param name='assembly'></param>
        /// <param name='stateSource'></param>
        public void Load(AppDomain dom, string assembly, StateSource stateSource)
        {
            m_Assembly = assembly;
            m_stateSource = stateSource;

            ApiManager am = new ApiManager();

            foreach (string api in am.GetApis())
            {
                m_Apis[api] = am.CreateApi(api);
                m_Apis[api].Initialize(Engine, Part, ScriptTask, m_coopSleepHandle);
            }
    
            try
            {
                if (dom != System.AppDomain.CurrentDomain)
                    m_Script 
                        = (IScript)dom.CreateInstanceAndUnwrap(
                            Path.GetFileNameWithoutExtension(assembly),
                            "SecondLife.Script",
                            false,
                            BindingFlags.Default,
                            null,
                            new object[] { m_coopSleepHandle },
                            null,
                            null,
                            null);
                else
                    m_Script 
                        = (IScript)Assembly.Load(Path.GetFileNameWithoutExtension(assembly)).CreateInstance(
                            "SecondLife.Script", 
                            false, 
                            BindingFlags.Default, 
                            null, 
                            new object[] { m_coopSleepHandle }, 
                            null, 
                            null);

                //ILease lease = (ILease)RemotingServices.GetLifetimeService(m_Script as ScriptBaseClass);
                //RemotingServices.GetLifetimeService(m_Script as ScriptBaseClass);
//                lease.Register(this);
            }
            catch (Exception e)
            {
                m_log.ErrorFormat(
                    "[SCRIPT INSTANCE]: Error loading assembly {0}.  Exception {1}{2}",
                    assembly, e.Message, e.StackTrace);
            }

            try
            {
                foreach (KeyValuePair<string,IScriptApi> kv in m_Apis)
                {
                    m_Script.InitApi(kv.Key, kv.Value);
                }

//                // m_log.Debug("[Script] Script instance created");

                Part.SetScriptEvents(ItemID,
                                     (int)m_Script.GetStateEventFlags(State));
            }
            catch (Exception e)
            {
                m_log.ErrorFormat(
                    "[SCRIPT INSTANCE]: Error loading script instance from assembly {0}.  Exception {1}{2}",
                    assembly, e.Message, e.StackTrace);

                return;
            }

            m_SaveState = true;

            string savedState = Path.Combine(Path.GetDirectoryName(assembly),
                    ItemID.ToString() + ".state");
            if (File.Exists(savedState))
            {
                string xml = String.Empty;

                try
                {
                    FileInfo fi = new FileInfo(savedState);
                    int size = (int)fi.Length;
                    if (size < 512000)
                    {
                        using (FileStream fs = File.Open(savedState,
                                                         FileMode.Open, FileAccess.Read, FileShare.None))
                        {
                            Byte[] data = new Byte[size];
                            fs.Read(data, 0, size);

                            xml = Encoding.UTF8.GetString(data);

                            ScriptSerializer.Deserialize(xml, this);

                            AsyncCommandManager.CreateFromData(Engine,
                                LocalID, ItemID, ObjectID,
                                PluginData);

//                            m_log.DebugFormat("[Script] Successfully retrieved state for script {0}.{1}", PrimName, m_ScriptName);

                            Part.SetScriptEvents(ItemID,
                                    (int)m_Script.GetStateEventFlags(State));

                            if (!Running)
                                m_startOnInit = false;

                            Running = false;

                            // we get new rez events on sim restart, too
                            // but if there is state, then we fire the change
                            // event

                            // We loaded state, don't force a re-save
                            m_SaveState = false;
                            m_startedFromSavedState = true;
                        }
                    }
                    else
                    {
                        m_log.WarnFormat(
                            "[SCRIPT INSTANCE]: Unable to load script state file {0} for script {1} {2} in {3} {4} (assembly {5}).  Memory limit exceeded",
                            savedState, ScriptName, ItemID, PrimName, ObjectID, assembly);
                    }
                }
                catch (Exception e)
                {
                     m_log.ErrorFormat(
                         "[SCRIPT INSTANCE]: Unable to load script state file {0} for script {1} {2} in {3} {4} (assembly {5}).  XML is {6}.  Exception {7}{8}",
                         savedState, ScriptName, ItemID, PrimName, ObjectID, assembly, xml, e.Message, e.StackTrace);
                }
            }
//            else
//            {
//                ScenePresence presence = Engine.World.GetScenePresence(part.OwnerID);

//                if (presence != null && (!postOnRez))
//                    presence.ControllingClient.SendAgentAlertMessage("Compile successful", false);

//            }
        }

        public void Init()
        {
            if (ShuttingDown)
                return;

            if (m_startedFromSavedState) 
            {
                if (m_startOnInit)
                    Start();
                if (m_postOnRez) 
                {
                    PostEvent(new EventParams("on_rez",
                        new Object[] {new LSL_Types.LSLInteger(StartParam)}, new DetectParams[0]));
                }

                if (m_stateSource == StateSource.AttachedRez)
                {
                    PostEvent(new EventParams("attach",
                        new object[] { new LSL_Types.LSLString(m_AttachedAvatar.ToString()) }, new DetectParams[0]));
                }
                else if (m_stateSource == StateSource.RegionStart)
                {
                    //m_log.Debug("[Script] Posted changed(CHANGED_REGION_RESTART) to script");
                    PostEvent(new EventParams("changed",
                        new Object[] { new LSL_Types.LSLInteger((int)Changed.REGION_RESTART) }, new DetectParams[0]));
                }
                else if (m_stateSource == StateSource.PrimCrossing || m_stateSource == StateSource.Teleporting)
                {
                    // CHANGED_REGION
                    PostEvent(new EventParams("changed",
                        new Object[] { new LSL_Types.LSLInteger((int)Changed.REGION) }, new DetectParams[0]));

                    // CHANGED_TELEPORT
                    if (m_stateSource == StateSource.Teleporting)
                        PostEvent(new EventParams("changed",
                            new Object[] { new LSL_Types.LSLInteger((int)Changed.TELEPORT) }, new DetectParams[0]));
                }
            }
            else 
            {
                if (m_startOnInit)
                    Start();
                PostEvent(new EventParams("state_entry",
                                          new Object[0], new DetectParams[0]));
                if (m_postOnRez) 
                {
                    PostEvent(new EventParams("on_rez",
                        new Object[] {new LSL_Types.LSLInteger(StartParam)}, new DetectParams[0]));
                }

                if (m_stateSource == StateSource.AttachedRez)
                {
                    PostEvent(new EventParams("attach",
                        new object[] { new LSL_Types.LSLString(m_AttachedAvatar.ToString()) }, new DetectParams[0]));
                }
            }
        }

        private void ReleaseControls()
        {
            int permsMask;
            UUID permsGranter;
            lock (Part.TaskInventory)
            {
                if (!Part.TaskInventory.ContainsKey(ItemID))
                    return;

                permsGranter = Part.TaskInventory[ItemID].PermsGranter;
                permsMask = Part.TaskInventory[ItemID].PermsMask;
            }

            if ((permsMask & ScriptBaseClass.PERMISSION_TAKE_CONTROLS) != 0)
            {
                ScenePresence presence = Engine.World.GetScenePresence(permsGranter);
                if (presence != null)
                    presence.UnRegisterControlEventsToScript(LocalID, ItemID);
            }
        }

        public void DestroyScriptInstance()
        {
            ReleaseControls();
            AsyncCommandManager.RemoveScript(Engine, LocalID, ItemID);
        }

        public void RemoveState()
        {
            string savedState = Path.Combine(Path.GetDirectoryName(m_Assembly),
                    ItemID.ToString() + ".state");

            try
            {
                File.Delete(savedState);
            }
            catch(Exception)
            {
            }
        }

        public void VarDump(Dictionary<string, object> vars)
        {
            // m_log.Info("Variable dump for script "+ ItemID.ToString());
            // foreach (KeyValuePair<string, object> v in vars)
            // {
                // m_log.Info("Variable: "+v.Key+" = "+v.Value.ToString());
            // }
        }

        public void Start()
        {
            lock (EventQueue)
            {
                if (Running)
                    return;

                Running = true;

                TimeStarted = DateTime.Now;
                MeasurementPeriodTickStart = Util.EnvironmentTickCount();
                MeasurementPeriodExecutionTime = 0;

                if (EventQueue.Count > 0)
                {
                    if (m_CurrentWorkItem == null)
                        m_CurrentWorkItem = Engine.QueueEventHandler(this);
                    // else
                        // m_log.Error("[Script] Tried to start a script that was already queued");
                }
            }
        }

        public bool Stop(int timeout)
        {
//            m_log.DebugFormat(
//                "[SCRIPT INSTANCE]: Stopping script {0} {1} in {2} {3} with timeout {4} {5} {6}",
//                ScriptName, ItemID, PrimName, ObjectID, timeout, m_InSelfDelete, DateTime.Now.Ticks);

            IScriptWorkItem workItem;

            lock (EventQueue)
            {
                if (!Running)
                    return true;

                // If we're not running or waiting to run an event then we can safely stop.
                if (m_CurrentWorkItem == null)
                {
                    Running = false;
                    return true;
                }

                // If we are waiting to run an event then we can try to cancel it.
                if (m_CurrentWorkItem.Cancel())
                {
                    m_CurrentWorkItem = null;
                    Running = false;
                    return true;
                }

                workItem = m_CurrentWorkItem;
                Running = false;
            }

            // Wait for the current event to complete.
            if (!m_InSelfDelete)
            {
                if (!m_coopTermination)
                {
                    // If we're not co-operative terminating then try and wait for the event to complete before stopping
                    if (workItem.Wait(new TimeSpan((long)timeout * 100000)))
                        return true;
                }
                else
                {
                    m_log.DebugFormat(
                        "[SCRIPT INSTANCE]: Co-operatively stopping script {0} {1} in {2} {3}",
                        ScriptName, ItemID, PrimName, ObjectID);

                    // This will terminate the event on next handle check by the script.
                    m_coopSleepHandle.Set();

                    // For now, we will wait forever since the event should always cleanly terminate once LSL loop
                    // checking is implemented.  May want to allow a shorter timeout option later.
                    if (workItem.Wait(TimeSpan.MaxValue))
                    {
                        m_log.DebugFormat(
                            "[SCRIPT INSTANCE]: Co-operatively stopped script {0} {1} in {2} {3}",
                            ScriptName, ItemID, PrimName, ObjectID);

                        return true;
                    }
                }
            }

            lock (EventQueue)
            {
                workItem = m_CurrentWorkItem;
            }

            if (workItem == null)
                return true;

            // If the event still hasn't stopped and we the stop isn't the result of script or object removal, then
            // forcibly abort the work item (this aborts the underlying thread).
            // Co-operative termination should never reach this point.
            if (!m_InSelfDelete)
            {
                m_log.DebugFormat(
                    "[SCRIPT INSTANCE]: Aborting unstopped script {0} {1} in prim {2}, localID {3}, timeout was {4} ms", 
                    ScriptName, ItemID, PrimName, LocalID, timeout);

                workItem.Abort();
            }

            lock (EventQueue)
            {
                m_CurrentWorkItem = null;
            }

            return true;
        }

        public void SetState(string state)
        {
            if (state == State)
                return;

            PostEvent(new EventParams("state_exit", new Object[0],
                                       new DetectParams[0]));
            PostEvent(new EventParams("state", new Object[] { state },
                                       new DetectParams[0]));
            PostEvent(new EventParams("state_entry", new Object[0],
                                       new DetectParams[0]));

            throw new EventAbortException();
        }

        /// <summary>
        /// Post an event to this script instance.
        /// </summary>
        /// <remarks>
        /// The request to run the event is sent
        /// </remarks>
        /// <param name="data"></param>
        public void PostEvent(EventParams data)
        {
//            m_log.DebugFormat("[Script] Posted event {2} in state {3} to {0}.{1}",
//                        PrimName, ScriptName, data.EventName, State);

            if (!Running)
                return;

            // If min event delay is set then ignore any events untill the time has expired
            // This currently only allows 1 event of any type in the given time period.
            // This may need extending to allow for a time for each individual event type.
            if (m_eventDelayTicks != 0)
            {
                if (DateTime.Now.Ticks < m_nextEventTimeTicks)
                    return;
                m_nextEventTimeTicks = DateTime.Now.Ticks + m_eventDelayTicks;
            }

            lock (EventQueue)
            {
                if (EventQueue.Count >= m_MaxScriptQueue)
                    return;

                if (data.EventName == "timer")
                {
                    if (m_TimerQueued)
                        return;
                    m_TimerQueued = true;
                }

                if (data.EventName == "control")
                {
                    int held = ((LSL_Types.LSLInteger)data.Params[1]).value;
                    // int changed = ((LSL_Types.LSLInteger)data.Params[2]).value;

                    // If the last message was a 0 (nothing held)
                    // and this one is also nothing held, drop it
                    //
                    if (m_LastControlLevel == held && held == 0)
                        return;

                    // If there is one or more queued, then queue
                    // only changed ones, else queue unconditionally
                    //
                    if (m_ControlEventsInQueue > 0)
                    {
                        if (m_LastControlLevel == held)
                            return;
                    }

                    m_LastControlLevel = held;
                    m_ControlEventsInQueue++;
                }

                if (data.EventName == "collision")
                {
                    if (m_CollisionInQueue)
                        return;
                    if (data.DetectParams == null)
                        return;

                    m_CollisionInQueue = true;
                }

                EventQueue.Enqueue(data);

                if (m_CurrentWorkItem == null)
                {
                    m_CurrentWorkItem = Engine.QueueEventHandler(this);
                }
            }
        }

        /// <summary>
        /// Process the next event queued for this script
        /// </summary>
        /// <returns></returns>
        public object EventProcessor()
        {
            // We check here as the thread stopping this instance from running may itself hold the m_Script lock.
            if (!Running)
                return 0;

            lock (m_Script)
            {
//                m_log.DebugFormat("[XEngine]: EventProcessor() invoked for {0}.{1}", PrimName, ScriptName);

                if (Suspended)
                    return 0;

                EventParams data = null;

                lock (EventQueue)
                {
                    data = (EventParams)EventQueue.Dequeue();
                    if (data == null) // Shouldn't happen
                    {
                        if (EventQueue.Count > 0 && Running && !ShuttingDown)
                        {
                            m_CurrentWorkItem = Engine.QueueEventHandler(this);
                        }
                        else
                        {
                            m_CurrentWorkItem = null;
                        }
                        return 0;
                    }

                    if (data.EventName == "timer")
                        m_TimerQueued = false;
                    if (data.EventName == "control")
                    {
                        if (m_ControlEventsInQueue > 0)
                            m_ControlEventsInQueue--;
                    }
                    if (data.EventName == "collision")
                        m_CollisionInQueue = false;
                }

                if (DebugLevel >= 2)
                    m_log.DebugFormat(
                        "[SCRIPT INSTANCE]: Processing event {0} for {1}/{2}({3})/{4}({5}) @ {6}/{7}", 
                        data.EventName, 
                        ScriptName, 
                        Part.Name, 
                        Part.LocalId, 
                        Part.ParentGroup.Name, 
                        Part.ParentGroup.UUID, 
                        Part.AbsolutePosition, 
                        Part.ParentGroup.Scene.Name);

                m_DetectParams = data.DetectParams;

                if (data.EventName == "state") // Hardcoded state change
                {
                    State = data.Params[0].ToString();

                    if (DebugLevel >= 1)
                        m_log.DebugFormat(
                            "[SCRIPT INSTANCE]: Changing state to {0} for {1}/{2}({3})/{4}({5}) @ {6}/{7}", 
                            State, 
                            ScriptName, 
                            Part.Name, 
                            Part.LocalId, 
                            Part.ParentGroup.Name, 
                            Part.ParentGroup.UUID, 
                            Part.AbsolutePosition, 
                            Part.ParentGroup.Scene.Name);

                    AsyncCommandManager.RemoveScript(Engine,
                        LocalID, ItemID);

                    Part.SetScriptEvents(ItemID, (int)m_Script.GetStateEventFlags(State));
                }
                else
                {
                    if (Engine.World.PipeEventsForScript(LocalID) ||
                        data.EventName == "control") // Don't freeze avies!
                    {
        //                m_log.DebugFormat("[Script] Delivered event {2} in state {3} to {0}.{1}",
        //                        PrimName, ScriptName, data.EventName, State);

                        try
                        {
                            m_CurrentEvent = data.EventName;
                            m_EventStart = DateTime.Now;
                            m_InEvent = true;

                            int start = Util.EnvironmentTickCount();

                            // Reset the measurement period when we reach the end of the current one.
                            if (start - MeasurementPeriodTickStart > MaxMeasurementPeriod)
                                MeasurementPeriodTickStart = start;

                            m_Script.ExecuteEvent(State, data.EventName, data.Params);

                            MeasurementPeriodExecutionTime += Util.EnvironmentTickCount() - start;

                            m_InEvent = false;
                            m_CurrentEvent = String.Empty;

                            if (m_SaveState)
                            {
                                // This will be the very first event we deliver
                                // (state_entry) in default state
                                //
                                SaveState(m_Assembly);

                                m_SaveState = false;
                            }
                        }
                        catch (Exception e)
                        {
//                            m_log.DebugFormat(
//                                "[SCRIPT] Exception in script {0} {1}: {2}{3}",
//                                ScriptName, ItemID, e.Message, e.StackTrace);

                            m_InEvent = false;
                            m_CurrentEvent = String.Empty;

                            if ((!(e is TargetInvocationException) 
                                || (!(e.InnerException is SelfDeleteException) 
                                    && !(e.InnerException is ScriptDeleteException)
                                    && !(e.InnerException is ScriptCoopStopException))) 
                                && !(e is ThreadAbortException))
                            {
                                try
                                {
                                    // DISPLAY ERROR INWORLD
                                    string text = FormatException(e);

                                    if (text.Length > 1000)
                                        text = text.Substring(0, 1000);
                                    Engine.World.SimChat(Utils.StringToBytes(text),
                                                           ChatTypeEnum.DebugChannel, 2147483647,
                                                           Part.AbsolutePosition,
                                                           Part.Name, Part.UUID, false);


                                    m_log.DebugFormat(
                                        "[SCRIPT INSTANCE]: Runtime error in script {0}, part {1} {2} at {3} in {4}, displayed error {5}, actual exception {6}", 
                                        ScriptName, 
                                        PrimName, 
                                        Part.UUID,
                                        Part.AbsolutePosition,
                                        Part.ParentGroup.Scene.Name, 
                                        text.Replace("\n", "\\n"), 
                                        e.InnerException);
                                }
                                catch (Exception)
                                {
                                }
                                // catch (Exception e2) // LEGIT: User Scripting
                                // {
                                    // m_log.Error("[SCRIPT]: "+
                                      //           "Error displaying error in-world: " +
                                        //         e2.ToString());
                                 //    m_log.Error("[SCRIPT]: " +
                                   //              "Errormessage: Error compiling script:\r\n" +
                                     //            e.ToString());
                                // }
                            }
                            else if ((e is TargetInvocationException) && (e.InnerException is SelfDeleteException))
                            {
                                m_InSelfDelete = true;
                                Engine.World.DeleteSceneObject(Part.ParentGroup, false);
                            }
                            else if ((e is TargetInvocationException) && (e.InnerException is ScriptDeleteException))
                            {
                                m_InSelfDelete = true;
                                Part.Inventory.RemoveInventoryItem(ItemID);
                            }
                            else if ((e is TargetInvocationException) && (e.InnerException is ScriptCoopStopException))
                            {
                                m_log.DebugFormat(
                                    "[SCRIPT INSTANCE]: Script {0}.{1} in event {2}, state {3} stopped co-operatively.",
                                    PrimName, ScriptName, data.EventName, State);
                            }
                        }
                    }
                }

                // If there are more events and we are currently running and not shutting down, then ask the
                // script engine to run the next event.
                lock (EventQueue)
                {
                    EventsProcessed++;

                    if (EventQueue.Count > 0 && Running && !ShuttingDown)
                    {
                        m_CurrentWorkItem = Engine.QueueEventHandler(this);
                    }
                    else
                    {
                        m_CurrentWorkItem = null;
                    }
                }

                m_DetectParams = null;

                return 0;
            }
        }

        public int EventTime()
        {
            if (!m_InEvent)
                return 0;

            return (DateTime.Now - m_EventStart).Seconds;
        }

        public void ResetScript(int timeout)
        {
            if (m_Script == null)
                return;

            bool running = Running;

            RemoveState();
            ReleaseControls();

            Stop(timeout);
            Part.Inventory.GetInventoryItem(ItemID).PermsMask = 0;
            Part.Inventory.GetInventoryItem(ItemID).PermsGranter = UUID.Zero;
            AsyncCommandManager.RemoveScript(Engine, LocalID, ItemID);
            EventQueue.Clear();
            m_Script.ResetVars();
            State = "default";

            Part.SetScriptEvents(ItemID,
                                 (int)m_Script.GetStateEventFlags(State));
            if (running)
                Start();
            m_SaveState = true;
            PostEvent(new EventParams("state_entry",
                    new Object[0], new DetectParams[0]));
        }

        public void ApiResetScript()
        {
            // bool running = Running;

            RemoveState();
            ReleaseControls();

            m_Script.ResetVars();
            Part.Inventory.GetInventoryItem(ItemID).PermsMask = 0;
            Part.Inventory.GetInventoryItem(ItemID).PermsGranter = UUID.Zero;
            AsyncCommandManager.RemoveScript(Engine, LocalID, ItemID);

            EventQueue.Clear();
            m_Script.ResetVars();
            State = "default";

            Part.SetScriptEvents(ItemID,
                                 (int)m_Script.GetStateEventFlags(State));

            if (m_CurrentEvent != "state_entry")
            {
                m_SaveState = true;
                PostEvent(new EventParams("state_entry",
                        new Object[0], new DetectParams[0]));
                throw new EventAbortException();
            }
        }

        public Dictionary<string, object> GetVars()
        {
            if (m_Script != null)
                return m_Script.GetVars();
            else
                return new Dictionary<string, object>();
        }

        public void SetVars(Dictionary<string, object> vars)
        {
            m_Script.SetVars(vars);
        }

        public DetectParams GetDetectParams(int idx)
        {
            if (m_DetectParams == null)
                return null;
            if (idx < 0 || idx >= m_DetectParams.Length)
                return null;

            return m_DetectParams[idx];
        }

        public UUID GetDetectID(int idx)
        {
            if (m_DetectParams == null)
                return UUID.Zero;
            if (idx < 0 || idx >= m_DetectParams.Length)
                return UUID.Zero;

            return m_DetectParams[idx].Key;
        }

        public void SaveState(string assembly)
        {
            // If we're currently in an event, just tell it to save upon return
            //
            if (m_InEvent)
            {
                m_SaveState = true;
                return;
            }

            PluginData = AsyncCommandManager.GetSerializationData(Engine, ItemID);

            string xml = ScriptSerializer.Serialize(this);

            // Compare hash of the state we just just created with the state last written to disk
            // If the state is different, update the disk file.
            UUID hash = UUID.Parse(Utils.MD5String(xml));

            if (hash != m_CurrentStateHash)
            {
                try
                {
                    FileStream fs = File.Create(Path.Combine(Path.GetDirectoryName(assembly), ItemID.ToString() + ".state"));
                    Byte[] buf = Util.UTF8NoBomEncoding.GetBytes(xml);
                    fs.Write(buf, 0, buf.Length);
                    fs.Close();
                }
                catch(Exception)
                {
                    // m_log.Error("Unable to save xml\n"+e.ToString());
                }
                //if (!File.Exists(Path.Combine(Path.GetDirectoryName(assembly), ItemID.ToString() + ".state")))
                //{
                //    throw new Exception("Completed persistence save, but no file was created");
                //}
                m_CurrentStateHash = hash;
            }
        }

        public IScriptApi GetApi(string name)
        {
            if (m_Apis.ContainsKey(name))
            {
//                m_log.DebugFormat("[SCRIPT INSTANCE]: Found api {0} in {1}@{2}", name, ScriptName, PrimName);

                return m_Apis[name];
            }

//            m_log.DebugFormat("[SCRIPT INSTANCE]: Did not find api {0} in {1}@{2}", name, ScriptName, PrimName);

            return null;
        }
        
        public override string ToString()
        {
            return String.Format("{0} {1} on {2}", ScriptName, ItemID, PrimName);
        }

        string FormatException(Exception e)
        {
            if (e.InnerException == null) // Not a normal runtime error
                return e.ToString();

            string message = "Runtime error:\n" + e.InnerException.StackTrace;
            string[] lines = message.Split(new char[] {'\n'});

            foreach (string line in lines)
            {
                if (line.Contains("SecondLife.Script"))
                {
                    int idx = line.IndexOf(':');
                    if (idx != -1)
                    {
                        string val = line.Substring(idx+1);
                        int lineNum = 0;
                        if (int.TryParse(val, out lineNum))
                        {
                            KeyValuePair<int, int> pos =
                                    Compiler.FindErrorPosition(
                                    lineNum, 0, LineMap);

                            int scriptLine = pos.Key;
                            int col = pos.Value;
                            if (scriptLine == 0)
                                scriptLine++;
                            if (col == 0)
                                col++;
                            message = string.Format("Runtime error:\n" +
                                    "({0}): {1}", scriptLine - 1,
                                    e.InnerException.Message);

                            return message;
                        }
                    }
                }
            }

            // m_log.ErrorFormat("Scripting exception:");
            // m_log.ErrorFormat(e.ToString());

            return e.ToString();
        }

        public string GetAssemblyName()
        {
            return m_Assembly;
        }

        public string GetXMLState()
        {
            bool run = Running;
            Stop(100);
            Running = run;

            // We should not be doing this, but since we are about to
            // dispose this, it really doesn't make a difference
            // This is meant to work around a Windows only race
            //
            m_InEvent = false;

            // Force an update of the in-memory plugin data
            //
            PluginData = AsyncCommandManager.GetSerializationData(Engine, ItemID);

            return ScriptSerializer.Serialize(this);
        }

        public UUID RegionID
        {
            get { return m_RegionID; }
        }

        public void Suspend()
        {
            Suspended = true;
        }

        public void Resume()
        {
            Suspended = false;
        }
    }
}