aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/OpenSim/Region/DataSnapshot/DataSnapshotManager.cs
blob: 209fb52c10d808e2ce73ed4a9e4263eb118c29d2 (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
/*
* 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.Generic;
using System.IO;
using System.Net;
using System.Reflection;
using System.Xml;
using log4net;
using Nini.Config;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Framework.Communications;
using OpenSim.Region.DataSnapshot.Interfaces;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.DataSnapshot
{
    public class DataSnapshotManager : IRegionModule, IDataSnapshot
    {
        #region Class members
        //Information from config
        private bool m_enabled = false;
        private bool m_configLoaded = false;
        private List<string> m_disabledModules = new List<string>();
        private Dictionary<string, string> m_gridinfo = new Dictionary<string, string>();
        private string m_snapsDir = "DataSnapshot";
        private string m_exposure_level = "minimum";

        //Lists of stuff we need
        private List<Scene> m_scenes = new List<Scene>();
        private List<IDataSnapshotProvider> m_dataproviders = new List<IDataSnapshotProvider>();

        //Various internal objects
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        internal object m_syncInit = new object();

        //DataServices and networking
        private string m_dataServices = "noservices";
        public string m_listener_port = ConfigSettings.DefaultRegionHttpPort.ToString();
        public string m_hostname = "127.0.0.1";

        //Update timers
        private int m_period = 20; // in seconds
        private int m_maxStales = 500;
        private int m_stales = 0;
        private int m_lastUpdate = 0;

        //Program objects
        private SnapshotStore m_snapStore = null;

        #endregion

        #region Properties

        public string ExposureLevel
        {
            get { return m_exposure_level; }
        }

        #endregion

        #region IRegionModule

        public void Initialise(Scene scene, IConfigSource config)
        {
            if (!m_configLoaded) 
            {
                m_configLoaded = true;
                //m_log.Debug("[DATASNAPSHOT]: Loading configuration");
                //Read from the config for options
                lock (m_syncInit)
                {
                    try
                    {
                        m_enabled = config.Configs["DataSnapshot"].GetBoolean("index_sims", m_enabled);
                        IConfig conf = config.Configs["GridService"];
                        if (conf != null)
                            m_gridinfo.Add("gatekeeperURL", conf.GetString("Gatekeeper", String.Empty));

                        m_gridinfo.Add(
                            "name", config.Configs["DataSnapshot"].GetString("gridname", "the lost continent of hippo"));
                        m_exposure_level = config.Configs["DataSnapshot"].GetString("data_exposure", m_exposure_level);
                        m_period = config.Configs["DataSnapshot"].GetInt("default_snapshot_period", m_period);
                        m_maxStales = config.Configs["DataSnapshot"].GetInt("max_changes_before_update", m_maxStales);
                        m_snapsDir = config.Configs["DataSnapshot"].GetString("snapshot_cache_directory", m_snapsDir);
                        m_dataServices = config.Configs["DataSnapshot"].GetString("data_services", m_dataServices);
                        m_listener_port = config.Configs["Network"].GetString("http_listener_port", m_listener_port);

                        String[] annoying_string_array = config.Configs["DataSnapshot"].GetString("disable_modules", "").Split(".".ToCharArray());
                        foreach (String bloody_wanker in annoying_string_array)
                        {
                            m_disabledModules.Add(bloody_wanker);
                        }
                        m_lastUpdate = Environment.TickCount;
                    }
                    catch (Exception)
                    {
                        m_log.Warn("[DATASNAPSHOT]: Could not load configuration. DataSnapshot will be disabled.");
                        m_enabled = false;
                        return;
                    }
                }

                if (m_enabled)
                {
                    //Hand it the first scene, assuming that all scenes have the same BaseHTTPServer
                    new DataRequestHandler(scene, this);

                    m_hostname = scene.RegionInfo.ExternalHostName;
                    m_snapStore = new SnapshotStore(m_snapsDir, m_gridinfo, m_listener_port, m_hostname);

                    MakeEverythingStale();

                    if (m_dataServices != "" &&  m_dataServices != "noservices")
                        NotifyDataServices(m_dataServices, "online");
                }
            }

            if (m_enabled)
            {
                m_log.Info("[DATASNAPSHOT]: Scene added to module.");

                m_snapStore.AddScene(scene);
                m_scenes.Add(scene);

                Assembly currentasm = Assembly.GetExecutingAssembly();

                foreach (Type pluginType in currentasm.GetTypes())
                {
                    if (pluginType.IsPublic)
                    {
                        if (!pluginType.IsAbstract)
                        {
                            if (pluginType.GetInterface("IDataSnapshotProvider") != null)
                            {
                                IDataSnapshotProvider module = (IDataSnapshotProvider)Activator.CreateInstance(pluginType);
                                module.Initialize(scene, this);
                                module.OnStale += MarkDataStale;

                                m_dataproviders.Add(module);
                                m_snapStore.AddProvider(module);

                                m_log.Info("[DATASNAPSHOT]: Added new data provider type: " + pluginType.Name);
                            }
                        }
                    }
                }

                //scene.OnRestart += OnSimRestart;
                scene.EventManager.OnShutdown += delegate() { OnSimRestart(scene.RegionInfo); };
            }
            else
            {
                //m_log.Debug("[DATASNAPSHOT]: Data snapshot disabled, not adding scene to module (or anything else).");
            }
        }

        public void Close() 
        {
            if (m_enabled && m_dataServices != "" && m_dataServices != "noservices")
                NotifyDataServices(m_dataServices, "offline");
        }


        public bool IsSharedModule
        {
            get { return true; }
        }

        public string Name
        {
            get { return "External Data Generator"; }
        }

        public void PostInitialise()
        {

        }

        #endregion

        #region Associated helper functions

        public Scene SceneForName(string name)
        {
            foreach (Scene scene in m_scenes)
                if (scene.RegionInfo.RegionName == name)
                    return scene;

            return null;
        }

        public Scene SceneForUUID(UUID id)
        {
            foreach (Scene scene in m_scenes)
                if (scene.RegionInfo.RegionID == id)
                    return scene;

            return null;
        }

        #endregion

        #region [Public] Snapshot storage functions

        /**
         * Reply to the http request
         */
        public XmlDocument GetSnapshot(string regionName)
        {
            CheckStale();

            XmlDocument requestedSnap = new XmlDocument();
            requestedSnap.AppendChild(requestedSnap.CreateXmlDeclaration("1.0", null, null));
            requestedSnap.AppendChild(requestedSnap.CreateWhitespace("\r\n"));

            XmlNode regiondata = requestedSnap.CreateNode(XmlNodeType.Element, "regiondata", "");
            try
            {
                if (regionName == null || regionName == "")
                {
                    XmlNode timerblock = requestedSnap.CreateNode(XmlNodeType.Element, "expire", "");
                    timerblock.InnerText = m_period.ToString();
                    regiondata.AppendChild(timerblock);

                    regiondata.AppendChild(requestedSnap.CreateWhitespace("\r\n"));
                    foreach (Scene scene in m_scenes)
                    {
                        regiondata.AppendChild(m_snapStore.GetScene(scene, requestedSnap));
                    }
                }
                else
                {
                    Scene scene = SceneForName(regionName);
                    regiondata.AppendChild(m_snapStore.GetScene(scene, requestedSnap));
                }
                requestedSnap.AppendChild(regiondata);
                regiondata.AppendChild(requestedSnap.CreateWhitespace("\r\n"));
            }
            catch (XmlException e)
            {
                m_log.Warn("[DATASNAPSHOT]: XmlException while trying to load snapshot: " + e.ToString());
                requestedSnap = GetErrorMessage(regionName, e);
            }
            catch (Exception e)
            {
                m_log.Warn("[DATASNAPSHOT]: Caught unknown exception while trying to load snapshot: " + e.StackTrace);
                requestedSnap = GetErrorMessage(regionName, e);
            }


            return requestedSnap;
        }

        private XmlDocument GetErrorMessage(string regionName, Exception e)
        {
            XmlDocument errorMessage = new XmlDocument();
            XmlNode error = errorMessage.CreateNode(XmlNodeType.Element, "error", "");
            XmlNode region = errorMessage.CreateNode(XmlNodeType.Element, "region", "");
            region.InnerText = regionName;

            XmlNode exception = errorMessage.CreateNode(XmlNodeType.Element, "exception", "");
            exception.InnerText = e.ToString();

            error.AppendChild(region);
            error.AppendChild(exception);
            errorMessage.AppendChild(error);

            return errorMessage;
        }

        #endregion

        #region External data services
        private void NotifyDataServices(string servicesStr, string serviceName)
        {
            Stream reply = null;
            string delimStr = ";";
            char [] delimiter = delimStr.ToCharArray();

            string[] services = servicesStr.Split(delimiter);

            for (int i = 0; i < services.Length; i++)
            {
                string url = services[i].Trim();
                RestClient cli = new RestClient(url);
                cli.AddQueryParameter("service", serviceName);
                cli.AddQueryParameter("host", m_hostname);
                cli.AddQueryParameter("port", m_listener_port);
                cli.RequestMethod = "GET";
                try
                {
                    reply = cli.Request();
                }
                catch (WebException)
                {
                    m_log.Warn("[DATASNAPSHOT]: Unable to notify " + url);
                }
                catch (Exception e)
                {
                    m_log.Warn("[DATASNAPSHOT]: Ignoring unknown exception " + e.ToString());
                }
                byte[] response = new byte[1024];
                // int n = 0;
                try
                {
                    // n = reply.Read(response, 0, 1024);
                    reply.Read(response, 0, 1024);
                }
                catch (Exception e)
                {
                    m_log.WarnFormat("[DATASNAPSHOT]: Unable to decode reply from data service. Ignoring. {0}", e.StackTrace);
                }
                // This is not quite working, so...
                // string responseStr = Util.UTF8.GetString(response);
                m_log.Info("[DATASNAPSHOT]: data service notified: " + url);
            }

        }
        #endregion

        #region Latency-based update functions

        public void MarkDataStale(IDataSnapshotProvider provider)
        {
            //Behavior here: Wait m_period seconds, then update if there has not been a request in m_period seconds
            //or m_maxStales has been exceeded
            m_stales++;
        }

        private void CheckStale()
        {
            // Wrap check
            if (Environment.TickCount < m_lastUpdate)
            {
                m_lastUpdate = Environment.TickCount;
            }

            if (m_stales >= m_maxStales)
            {
                if (Environment.TickCount - m_lastUpdate >= 20000)
                {
                    m_stales = 0;
                    m_lastUpdate = Environment.TickCount;
                    MakeEverythingStale();
                }
            }
            else
            {
                if (m_lastUpdate + 1000 * m_period < Environment.TickCount)
                {
                    m_stales = 0;
                    m_lastUpdate = Environment.TickCount;
                    MakeEverythingStale();
                }
            }
        }

        public void MakeEverythingStale()
        {
            m_log.Debug("[DATASNAPSHOT]: Marking all scenes as stale.");
            foreach (Scene scene in m_scenes)
            {
                m_snapStore.ForceSceneStale(scene);
            }
        }

        #endregion

        public void OnSimRestart(RegionInfo thisRegion)
        {
            m_log.Info("[DATASNAPSHOT]: Region " + thisRegion.RegionName + " is restarting, removing from indexing");
            Scene restartedScene = SceneForUUID(thisRegion.RegionID);

            m_scenes.Remove(restartedScene);
            m_snapStore.RemoveScene(restartedScene);

            //Getting around the fact that we can't remove objects from a collection we are enumerating over
            List<IDataSnapshotProvider> providersToRemove = new List<IDataSnapshotProvider>();

            foreach (IDataSnapshotProvider provider in m_dataproviders)
            {
                if (provider.GetParentScene == restartedScene)
                {
                    providersToRemove.Add(provider);
                }
            }

            foreach (IDataSnapshotProvider provider in providersToRemove)
            {
                m_dataproviders.Remove(provider);
                m_snapStore.RemoveProvider(provider);
            }

            m_snapStore.RemoveScene(restartedScene);
        }
    }
}