src/main/java/net/pterodactylus/sone/core/SoneDownloader.java

   1 /*
   2  * Sone - SoneDownloader.java - Copyright © 2010 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.core;
  19
  20 import java.io.IOException;
  21 import java.io.InputStream;
  22 import java.net.MalformedURLException;
  23 import java.util.HashSet;
  24 import java.util.Set;
  25 import java.util.logging.Level;
  26 import java.util.logging.Logger;
  27
  28 import net.pterodactylus.sone.core.Core.SoneStatus;
  29 import net.pterodactylus.sone.data.Post;
  30 import net.pterodactylus.sone.data.Profile;
  31 import net.pterodactylus.sone.data.Reply;
  32 import net.pterodactylus.sone.data.Sone;
  33 import net.pterodactylus.util.io.Closer;
  34 import net.pterodactylus.util.logging.Logging;
  35 import net.pterodactylus.util.number.Numbers;
  36 import net.pterodactylus.util.service.AbstractService;
  37 import net.pterodactylus.util.xml.SimpleXML;
  38 import net.pterodactylus.util.xml.XML;
  39
  40 import org.w3c.dom.Document;
  41
  42 import freenet.client.FetchResult;
  43 import freenet.keys.FreenetURI;
  44 import freenet.support.api.Bucket;
  45
  46 /**
  47  * The Sone downloader is responsible for download Sones as they are updated.
  48  *
  49  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  50  */
  51 public class SoneDownloader extends AbstractService {
  52
  53         /** The logger. */
  54         private static final Logger logger = Logging.getLogger(SoneDownloader.class);
  55
  56         /** The core. */
  57         private final Core core;
  58
  59         /** The Freenet interface. */
  60         private final FreenetInterface freenetInterface;
  61
  62         /** The sones to update. */
  63         private final Set<Sone> sones = new HashSet<Sone>();
  64
  65         /**
  66          * Creates a new Sone downloader.
  67          *
  68          * @param core
  69          *            The core
  70          * @param freenetInterface
  71          *            The Freenet interface
  72          */
  73         public SoneDownloader(Core core, FreenetInterface freenetInterface) {
  74                 super("Sone Downloader", false);
  75                 this.core = core;
  76                 this.freenetInterface = freenetInterface;
  77         }
  78
  79         //
  80         // ACTIONS
  81         //
  82
  83         /**
  84          * Adds the given Sone to the set of Sones that will be watched for updates.
  85          *
  86          * @param sone
  87          *            The Sone to add
  88          */
  89         public void addSone(Sone sone) {
  90                 if (sones.add(sone)) {
  91                         freenetInterface.registerUsk(sone, this);
  92                 }
  93         }
  94
  95         /**
  96          * Removes the given Sone from the downloader.
  97          *
  98          * @param sone
  99          *            The Sone to stop watching
 100          */
 101         public void removeSone(Sone sone) {
 102                 if (sones.remove(sone)) {
 103                         freenetInterface.unregisterUsk(sone);
 104                 }
 105         }
 106
 107         /**
 108          * Fetches the updated Sone. This method is a callback method for
 109          * {@link FreenetInterface#registerUsk(Sone, SoneDownloader)}.
 110          *
 111          * @param sone
 112          *            The Sone to fetch
 113          */
 114         public void fetchSone(Sone sone) {
 115                 if (core.getSoneStatus(sone) == SoneStatus.downloading) {
 116                         return;
 117                 }
 118                 logger.log(Level.FINE, "Starting fetch for Sone “%s” from %s…", new Object[] { sone, sone.getRequestUri().setMetaString(new String[] { "sone.xml" }) });
 119                 FreenetURI requestUri = sone.getRequestUri().setMetaString(new String[] { "sone.xml" });
 120                 core.setSoneStatus(sone, SoneStatus.downloading);
 121                 try {
 122                         FetchResult fetchResult = freenetInterface.fetchUri(requestUri);
 123                         if (fetchResult == null) {
 124                                 /* TODO - mark Sone as bad. */
 125                                 return;
 126                         }
 127                         logger.log(Level.FINEST, "Got %d bytes back.", fetchResult.size());
 128                         Sone parsedSone = parseSone(sone, fetchResult, requestUri);
 129                         if (parsedSone != null) {
 130                                 core.updateSone(parsedSone);
 131                         }
 132                 } finally {
 133                         core.setSoneStatus(sone, (sone.getTime() == 0) ? SoneStatus.unknown : SoneStatus.idle);
 134                 }
 135         }
 136
 137         /**
 138          * Parses a Sone from a fetch result.
 139          *
 140          * @param originalSone
 141          *            The sone to parse, or {@code null} if the Sone is yet unknown
 142          * @param fetchResult
 143          *            The fetch result
 144          * @param requestUri
 145          *            The requested URI
 146          * @return The parsed Sone, or {@code null} if the Sone could not be parsed
 147          */
 148         public Sone parseSone(Sone originalSone, FetchResult fetchResult, FreenetURI requestUri) {
 149                 logger.log(Level.FINEST, "Persing FetchResult (%d bytes, %s) for %s…", new Object[] { fetchResult.size(), fetchResult.getMimeType(), originalSone });
 150                 Bucket soneBucket = fetchResult.asBucket();
 151                 InputStream soneInputStream = null;
 152                 try {
 153                         soneInputStream = soneBucket.getInputStream();
 154                         Sone parsedSone = parseSone(originalSone, soneInputStream);
 155                         if (parsedSone != null) {
 156                                 parsedSone.setRequestUri(requestUri.setMetaString(new String[0]));
 157                         }
 158                         return parsedSone;
 159                 } catch (IOException ioe1) {
 160                         logger.log(Level.WARNING, "Could not parse Sone from " + requestUri + "!", ioe1);
 161                 } finally {
 162                         Closer.close(soneInputStream);
 163                         soneBucket.free();
 164                 }
 165                 return null;
 166         }
 167
 168         /**
 169          * Parses a Sone from the given input stream and updates the given Sone, or
 170          * creates a new Sone.
 171          *
 172          * @param sone
 173          *            The Sone to update
 174          * @param soneInputStream
 175          *            The input stream to parse the Sone from
 176          * @return The parsed Sone
 177          */
 178         public Sone parseSone(Sone sone, InputStream soneInputStream) {
 179                 /* TODO - impose a size limit? */
 180
 181                 Document document;
 182                 /* XML parsing is not thread-safe. */
 183                 synchronized (this) {
 184                         document = XML.transformToDocument(soneInputStream);
 185                 }
 186                 if (document == null) {
 187                         /* TODO - mark Sone as bad. */
 188                         logger.log(Level.WARNING, "Could not parse XML for Sone %s!", new Object[] { sone });
 189                         return null;
 190                 }
 191                 SimpleXML soneXml;
 192                 try {
 193                         soneXml = SimpleXML.fromDocument(document);
 194                 } catch (NullPointerException npe1) {
 195                         /* for some reason, invalid XML can cause NPEs. */
 196                         logger.log(Level.WARNING, "XML for Sone " + sone + " can not be parsed!", npe1);
 197                         return null;
 198                 }
 199
 200                 String soneTime = soneXml.getValue("time", null);
 201                 if (soneTime == null) {
 202                         /* TODO - mark Sone as bad. */
 203                         logger.log(Level.WARNING, "Downloaded time for Sone %s was null!", new Object[] { sone });
 204                         return null;
 205                 }
 206                 try {
 207                         sone.setTime(Long.parseLong(soneTime));
 208                 } catch (NumberFormatException nfe1) {
 209                         /* TODO - mark Sone as bad. */
 210                         logger.log(Level.WARNING, "Downloaded Sone %s with invalid time: %s", new Object[] { sone, soneTime });
 211                         return null;
 212                 }
 213
 214                 String soneRequestUri = soneXml.getValue("request-uri", null);
 215                 if (soneRequestUri != null) {
 216                         try {
 217                                 sone.setRequestUri(new FreenetURI(soneRequestUri));
 218                         } catch (MalformedURLException mue1) {
 219                                 /* TODO - mark Sone as bad. */
 220                                 logger.log(Level.WARNING, "Downloaded Sone " + sone + " has invalid request URI: " + soneRequestUri, mue1);
 221                                 return null;
 222                         }
 223                 }
 224
 225                 String soneInsertUri = soneXml.getValue("insert-uri", null);
 226                 if ((soneInsertUri != null) && (sone.getInsertUri() == null)) {
 227                         try {
 228                                 sone.setInsertUri(new FreenetURI(soneInsertUri));
 229                                 sone.setLatestEdition(Math.max(sone.getRequestUri().getSuggestedEdition(), sone.getInsertUri().getSuggestedEdition()));
 230                         } catch (MalformedURLException mue1) {
 231                                 /* TODO - mark Sone as bad. */
 232                                 logger.log(Level.WARNING, "Downloaded Sone " + sone + " has invalid insert URI: " + soneInsertUri, mue1);
 233                                 return null;
 234                         }
 235                 }
 236
 237                 SimpleXML profileXml = soneXml.getNode("profile");
 238                 if (profileXml == null) {
 239                         /* TODO - mark Sone as bad. */
 240                         logger.log(Level.WARNING, "Downloaded Sone %s has no profile!", new Object[] { sone });
 241                         return null;
 242                 }
 243
 244                 /* parse profile. */
 245                 String profileFirstName = profileXml.getValue("first-name", null);
 246                 String profileMiddleName = profileXml.getValue("middle-name", null);
 247                 String profileLastName = profileXml.getValue("last-name", null);
 248                 Integer profileBirthDay = Numbers.safeParseInteger(profileXml.getValue("birth-day", null));
 249                 Integer profileBirthMonth = Numbers.safeParseInteger(profileXml.getValue("birth-month", null));
 250                 Integer profileBirthYear = Numbers.safeParseInteger(profileXml.getValue("birth-year", null));
 251                 Profile profile = new Profile().setFirstName(profileFirstName).setMiddleName(profileMiddleName).setLastName(profileLastName);
 252                 profile.setBirthDay(profileBirthDay).setBirthMonth(profileBirthMonth).setBirthYear(profileBirthYear);
 253
 254                 /* parse posts. */
 255                 SimpleXML postsXml = soneXml.getNode("posts");
 256                 Set<Post> posts = new HashSet<Post>();
 257                 if (postsXml == null) {
 258                         /* TODO - mark Sone as bad. */
 259                         logger.log(Level.WARNING, "Downloaded Sone %s has no posts!", new Object[] { sone });
 260                 } else {
 261                         for (SimpleXML postXml : postsXml.getNodes("post")) {
 262                                 String postId = postXml.getValue("id", null);
 263                                 String postTime = postXml.getValue("time", null);
 264                                 String postText = postXml.getValue("text", null);
 265                                 if ((postId == null) || (postTime == null) || (postText == null)) {
 266                                         /* TODO - mark Sone as bad. */
 267                                         logger.log(Level.WARNING, "Downloaded post for Sone %s with missing data! ID: %s, Time: %s, Text: %s", new Object[] { sone, postId, postTime, postText });
 268                                         return null;
 269                                 }
 270                                 try {
 271                                         posts.add(core.getPost(postId).setSone(sone).setTime(Long.parseLong(postTime)).setText(postText));
 272                                 } catch (NumberFormatException nfe1) {
 273                                         /* TODO - mark Sone as bad. */
 274                                         logger.log(Level.WARNING, "Downloaded post for Sone %s with invalid time: %s", new Object[] { sone, postTime });
 275                                         return null;
 276                                 }
 277                         }
 278                 }
 279
 280                 /* parse replies. */
 281                 SimpleXML repliesXml = soneXml.getNode("replies");
 282                 Set<Reply> replies = new HashSet<Reply>();
 283                 if (repliesXml == null) {
 284                         /* TODO - mark Sone as bad. */
 285                         logger.log(Level.WARNING, "Downloaded Sone %s has no replies!", new Object[] { sone });
 286                 } else {
 287                         for (SimpleXML replyXml : repliesXml.getNodes("reply")) {
 288                                 String replyId = replyXml.getValue("id", null);
 289                                 String replyPostId = replyXml.getValue("post-id", null);
 290                                 String replyTime = replyXml.getValue("time", null);
 291                                 String replyText = replyXml.getValue("text", null);
 292                                 if ((replyId == null) || (replyPostId == null) || (replyTime == null) || (replyText == null)) {
 293                                         /* TODO - mark Sone as bad. */
 294                                         logger.log(Level.WARNING, "Downloaded reply for Sone %s with missing data! ID: %s, Post: %s, Time: %s, Text: %s", new Object[] { sone, replyId, replyPostId, replyTime, replyText });
 295                                         return null;
 296                                 }
 297                                 try {
 298                                         replies.add(core.getReply(replyId).setSone(sone).setPost(core.getPost(replyPostId)).setTime(Long.parseLong(replyTime)).setText(replyText));
 299                                 } catch (NumberFormatException nfe1) {
 300                                         /* TODO - mark Sone as bad. */
 301                                         logger.log(Level.WARNING, "Downloaded reply for Sone %s with invalid time: %s", new Object[] { sone, replyTime });
 302                                         return null;
 303                                 }
 304                         }
 305                 }
 306
 307                 /* parse liked post IDs. */
 308                 SimpleXML likePostIdsXml = soneXml.getNode("post-likes");
 309                 Set<String> likedPostIds = new HashSet<String>();
 310                 if (likePostIdsXml == null) {
 311                         /* TODO - mark Sone as bad. */
 312                         logger.log(Level.WARNING, "Downloaded Sone %s has no post likes!", new Object[] { sone });
 313                 } else {
 314                         for (SimpleXML likedPostIdXml : likePostIdsXml.getNodes("post-like")) {
 315                                 String postId = likedPostIdXml.getValue();
 316                                 likedPostIds.add(postId);
 317                         }
 318                 }
 319
 320                 /* parse liked reply IDs. */
 321                 SimpleXML likeReplyIdsXml = soneXml.getNode("reply-likes");
 322                 Set<String> likedReplyIds = new HashSet<String>();
 323                 if (likeReplyIdsXml == null) {
 324                         /* TODO - mark Sone as bad. */
 325                         logger.log(Level.WARNING, "Downloaded Sone %s has no reply likes!", new Object[] { sone });
 326                 } else {
 327                         for (SimpleXML likedReplyIdXml : likeReplyIdsXml.getNodes("reply-like")) {
 328                                 String replyId = likedReplyIdXml.getValue();
 329                                 likedReplyIds.add(replyId);
 330                         }
 331                 }
 332
 333                 /* okay, apparently everything was parsed correctly. Now import. */
 334                 /* atomic setter operation on the Sone. */
 335                 synchronized (sone) {
 336                         sone.setProfile(profile);
 337                         sone.setPosts(posts);
 338                         sone.setReplies(replies);
 339                         sone.setLikePostIds(likedPostIds);
 340                         sone.setModificationCounter(0);
 341                 }
 342
 343                 return sone;
 344         }
 345
 346         //
 347         // SERVICE METHODS
 348         //
 349
 350         /**
 351          * {@inheritDoc}
 352          */
 353         @Override
 354         protected void serviceStop() {
 355                 for (Sone sone : sones) {
 356                         freenetInterface.unregisterUsk(sone);
 357                 }
 358         }
 359
 360 }