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.Client;
  30 import net.pterodactylus.sone.data.Post;
  31 import net.pterodactylus.sone.data.Profile;
  32 import net.pterodactylus.sone.data.Reply;
  33 import net.pterodactylus.sone.data.Sone;
  34 import net.pterodactylus.util.collection.Pair;
  35 import net.pterodactylus.util.io.Closer;
  36 import net.pterodactylus.util.logging.Logging;
  37 import net.pterodactylus.util.number.Numbers;
  38 import net.pterodactylus.util.service.AbstractService;
  39 import net.pterodactylus.util.xml.SimpleXML;
  40 import net.pterodactylus.util.xml.XML;
  41
  42 import org.w3c.dom.Document;
  43
  44 import freenet.client.FetchResult;
  45 import freenet.keys.FreenetURI;
  46 import freenet.support.api.Bucket;
  47
  48 /**
  49  * The Sone downloader is responsible for download Sones as they are updated.
  50  *
  51  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  52  */
  53 public class SoneDownloader extends AbstractService {
  54
  55         /** The logger. */
  56         private static final Logger logger = Logging.getLogger(SoneDownloader.class);
  57
  58         /** The core. */
  59         private final Core core;
  60
  61         /** The Freenet interface. */
  62         private final FreenetInterface freenetInterface;
  63
  64         /** The sones to update. */
  65         private final Set<Sone> sones = new HashSet<Sone>();
  66
  67         /**
  68          * Creates a new Sone downloader.
  69          *
  70          * @param core
  71          *            The core
  72          * @param freenetInterface
  73          *            The Freenet interface
  74          */
  75         public SoneDownloader(Core core, FreenetInterface freenetInterface) {
  76                 super("Sone Downloader", false);
  77                 this.core = core;
  78                 this.freenetInterface = freenetInterface;
  79         }
  80
  81         //
  82         // ACTIONS
  83         //
  84
  85         /**
  86          * Adds the given Sone to the set of Sones that will be watched for updates.
  87          *
  88          * @param sone
  89          *            The Sone to add
  90          */
  91         public void addSone(Sone sone) {
  92                 if (sones.add(sone)) {
  93                         freenetInterface.registerUsk(sone, this);
  94                 }
  95         }
  96
  97         /**
  98          * Removes the given Sone from the downloader.
  99          *
 100          * @param sone
 101          *            The Sone to stop watching
 102          */
 103         public void removeSone(Sone sone) {
 104                 if (sones.remove(sone)) {
 105                         freenetInterface.unregisterUsk(sone);
 106                 }
 107         }
 108
 109         /**
 110          * Fetches the updated Sone. This method is a callback method for
 111          * {@link FreenetInterface#registerUsk(Sone, SoneDownloader)}.
 112          *
 113          * @param sone
 114          *            The Sone to fetch
 115          */
 116         public void fetchSone(Sone sone) {
 117                 if (core.getSoneStatus(sone) == SoneStatus.downloading) {
 118                         return;
 119                 }
 120                 logger.log(Level.FINE, "Starting fetch for Sone “%s” from %s…", new Object[] { sone, sone.getRequestUri().setMetaString(new String[] { "sone.xml" }) });
 121                 FreenetURI requestUri = sone.getRequestUri().setMetaString(new String[] { "sone.xml" });
 122                 core.setSoneStatus(sone, SoneStatus.downloading);
 123                 try {
 124                         Pair<FreenetURI, FetchResult> fetchResults = freenetInterface.fetchUri(requestUri);
 125                         if (fetchResults == null) {
 126                                 /* TODO - mark Sone as bad. */
 127                                 return;
 128                         }
 129                         logger.log(Level.FINEST, "Got %d bytes back.", fetchResults.getRight().size());
 130                         Sone parsedSone = parseSone(sone, fetchResults.getRight(), fetchResults.getLeft());
 131                         if (parsedSone != null) {
 132                                 core.updateSone(parsedSone);
 133                         }
 134                 } finally {
 135                         core.setSoneStatus(sone, (sone.getTime() == 0) ? SoneStatus.unknown : SoneStatus.idle);
 136                 }
 137         }
 138
 139         /**
 140          * Parses a Sone from a fetch result.
 141          *
 142          * @param originalSone
 143          *            The sone to parse, or {@code null} if the Sone is yet unknown
 144          * @param fetchResult
 145          *            The fetch result
 146          * @param requestUri
 147          *            The requested URI
 148          * @return The parsed Sone, or {@code null} if the Sone could not be parsed
 149          */
 150         public Sone parseSone(Sone originalSone, FetchResult fetchResult, FreenetURI requestUri) {
 151                 logger.log(Level.FINEST, "Parsing FetchResult (%d bytes, %s) for %s…", new Object[] { fetchResult.size(), fetchResult.getMimeType(), originalSone });
 152                 Bucket soneBucket = fetchResult.asBucket();
 153                 InputStream soneInputStream = null;
 154                 try {
 155                         soneInputStream = soneBucket.getInputStream();
 156                         Sone parsedSone = parseSone(originalSone, soneInputStream);
 157                         if (parsedSone != null) {
 158                                 parsedSone.setRequestUri(requestUri.setMetaString(new String[0]));
 159                         }
 160                         return parsedSone;
 161                 } catch (IOException ioe1) {
 162                         logger.log(Level.WARNING, "Could not parse Sone from " + requestUri + "!", ioe1);
 163                 } finally {
 164                         Closer.close(soneInputStream);
 165                         soneBucket.free();
 166                 }
 167                 return null;
 168         }
 169
 170         /**
 171          * Parses a Sone from the given input stream and creates a new Sone from the
 172          * parsed data.
 173          *
 174          * @param originalSone
 175          *            The Sone to update
 176          * @param soneInputStream
 177          *            The input stream to parse the Sone from
 178          * @return The parsed Sone
 179          */
 180         public Sone parseSone(Sone originalSone, InputStream soneInputStream) {
 181                 /* TODO - impose a size limit? */
 182
 183                 Document document;
 184                 /* XML parsing is not thread-safe. */
 185                 synchronized (this) {
 186                         document = XML.transformToDocument(soneInputStream);
 187                 }
 188                 if (document == null) {
 189                         /* TODO - mark Sone as bad. */
 190                         logger.log(Level.WARNING, "Could not parse XML for Sone %s!", new Object[] { originalSone });
 191                         return null;
 192                 }
 193
 194                 Sone sone = new Sone(originalSone.getId()).setIdentity(originalSone.getIdentity());
 195
 196                 SimpleXML soneXml;
 197                 try {
 198                         soneXml = SimpleXML.fromDocument(document);
 199                 } catch (NullPointerException npe1) {
 200                         /* for some reason, invalid XML can cause NPEs. */
 201                         logger.log(Level.WARNING, "XML for Sone " + sone + " can not be parsed!", npe1);
 202                         return null;
 203                 }
 204
 205                 String soneTime = soneXml.getValue("time", null);
 206                 if (soneTime == null) {
 207                         /* TODO - mark Sone as bad. */
 208                         logger.log(Level.WARNING, "Downloaded time for Sone %s was null!", new Object[] { sone });
 209                         return null;
 210                 }
 211                 try {
 212                         sone.setTime(Long.parseLong(soneTime));
 213                 } catch (NumberFormatException nfe1) {
 214                         /* TODO - mark Sone as bad. */
 215                         logger.log(Level.WARNING, "Downloaded Sone %s with invalid time: %s", new Object[] { sone, soneTime });
 216                         return null;
 217                 }
 218
 219                 SimpleXML clientXml = soneXml.getNode("client");
 220                 if (clientXml != null) {
 221                         String clientName = clientXml.getValue("name", null);
 222                         String clientVersion = clientXml.getValue("version", null);
 223                         if ((clientName == null) || (clientVersion == null)) {
 224                                 logger.log(Level.WARNING, "Download Sone %s with client XML but missing name or version!", sone);
 225                                 return null;
 226                         }
 227                         sone.setClient(new Client(clientName, clientVersion));
 228                 }
 229
 230                 String soneRequestUri = soneXml.getValue("request-uri", null);
 231                 if (soneRequestUri != null) {
 232                         try {
 233                                 sone.setRequestUri(new FreenetURI(soneRequestUri));
 234                         } catch (MalformedURLException mue1) {
 235                                 /* TODO - mark Sone as bad. */
 236                                 logger.log(Level.WARNING, "Downloaded Sone " + sone + " has invalid request URI: " + soneRequestUri, mue1);
 237                                 return null;
 238                         }
 239                 }
 240
 241                 String soneInsertUri = soneXml.getValue("insert-uri", null);
 242                 if ((soneInsertUri != null) && (sone.getInsertUri() == null)) {
 243                         try {
 244                                 sone.setInsertUri(new FreenetURI(soneInsertUri));
 245                                 sone.setLatestEdition(Math.max(sone.getRequestUri().getSuggestedEdition(), sone.getInsertUri().getSuggestedEdition()));
 246                         } catch (MalformedURLException mue1) {
 247                                 /* TODO - mark Sone as bad. */
 248                                 logger.log(Level.WARNING, "Downloaded Sone " + sone + " has invalid insert URI: " + soneInsertUri, mue1);
 249                                 return null;
 250                         }
 251                 }
 252
 253                 SimpleXML profileXml = soneXml.getNode("profile");
 254                 if (profileXml == null) {
 255                         /* TODO - mark Sone as bad. */
 256                         logger.log(Level.WARNING, "Downloaded Sone %s has no profile!", new Object[] { sone });
 257                         return null;
 258                 }
 259
 260                 /* parse profile. */
 261                 String profileFirstName = profileXml.getValue("first-name", null);
 262                 String profileMiddleName = profileXml.getValue("middle-name", null);
 263                 String profileLastName = profileXml.getValue("last-name", null);
 264                 Integer profileBirthDay = Numbers.safeParseInteger(profileXml.getValue("birth-day", null));
 265                 Integer profileBirthMonth = Numbers.safeParseInteger(profileXml.getValue("birth-month", null));
 266                 Integer profileBirthYear = Numbers.safeParseInteger(profileXml.getValue("birth-year", null));
 267                 Profile profile = new Profile().setFirstName(profileFirstName).setMiddleName(profileMiddleName).setLastName(profileLastName);
 268                 profile.setBirthDay(profileBirthDay).setBirthMonth(profileBirthMonth).setBirthYear(profileBirthYear);
 269
 270                 /* parse posts. */
 271                 SimpleXML postsXml = soneXml.getNode("posts");
 272                 Set<Post> posts = new HashSet<Post>();
 273                 if (postsXml == null) {
 274                         /* TODO - mark Sone as bad. */
 275                         logger.log(Level.WARNING, "Downloaded Sone %s has no posts!", new Object[] { sone });
 276                 } else {
 277                         for (SimpleXML postXml : postsXml.getNodes("post")) {
 278                                 String postId = postXml.getValue("id", null);
 279                                 String postTime = postXml.getValue("time", null);
 280                                 String postText = postXml.getValue("text", null);
 281                                 if ((postId == null) || (postTime == null) || (postText == null)) {
 282                                         /* TODO - mark Sone as bad. */
 283                                         logger.log(Level.WARNING, "Downloaded post for Sone %s with missing data! ID: %s, Time: %s, Text: %s", new Object[] { sone, postId, postTime, postText });
 284                                         return null;
 285                                 }
 286                                 try {
 287                                         posts.add(core.getPost(postId).setSone(sone).setTime(Long.parseLong(postTime)).setText(postText));
 288                                 } catch (NumberFormatException nfe1) {
 289                                         /* TODO - mark Sone as bad. */
 290                                         logger.log(Level.WARNING, "Downloaded post for Sone %s with invalid time: %s", new Object[] { sone, postTime });
 291                                         return null;
 292                                 }
 293                         }
 294                 }
 295
 296                 /* parse replies. */
 297                 SimpleXML repliesXml = soneXml.getNode("replies");
 298                 Set<Reply> replies = new HashSet<Reply>();
 299                 if (repliesXml == null) {
 300                         /* TODO - mark Sone as bad. */
 301                         logger.log(Level.WARNING, "Downloaded Sone %s has no replies!", new Object[] { sone });
 302                 } else {
 303                         for (SimpleXML replyXml : repliesXml.getNodes("reply")) {
 304                                 String replyId = replyXml.getValue("id", null);
 305                                 String replyPostId = replyXml.getValue("post-id", null);
 306                                 String replyTime = replyXml.getValue("time", null);
 307                                 String replyText = replyXml.getValue("text", null);
 308                                 if ((replyId == null) || (replyPostId == null) || (replyTime == null) || (replyText == null)) {
 309                                         /* TODO - mark Sone as bad. */
 310                                         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 });
 311                                         return null;
 312                                 }
 313                                 try {
 314                                         replies.add(core.getReply(replyId).setSone(sone).setPost(core.getPost(replyPostId)).setTime(Long.parseLong(replyTime)).setText(replyText));
 315                                 } catch (NumberFormatException nfe1) {
 316                                         /* TODO - mark Sone as bad. */
 317                                         logger.log(Level.WARNING, "Downloaded reply for Sone %s with invalid time: %s", new Object[] { sone, replyTime });
 318                                         return null;
 319                                 }
 320                         }
 321                 }
 322
 323                 /* parse liked post IDs. */
 324                 SimpleXML likePostIdsXml = soneXml.getNode("post-likes");
 325                 Set<String> likedPostIds = new HashSet<String>();
 326                 if (likePostIdsXml == null) {
 327                         /* TODO - mark Sone as bad. */
 328                         logger.log(Level.WARNING, "Downloaded Sone %s has no post likes!", new Object[] { sone });
 329                 } else {
 330                         for (SimpleXML likedPostIdXml : likePostIdsXml.getNodes("post-like")) {
 331                                 String postId = likedPostIdXml.getValue();
 332                                 likedPostIds.add(postId);
 333                         }
 334                 }
 335
 336                 /* parse liked reply IDs. */
 337                 SimpleXML likeReplyIdsXml = soneXml.getNode("reply-likes");
 338                 Set<String> likedReplyIds = new HashSet<String>();
 339                 if (likeReplyIdsXml == null) {
 340                         /* TODO - mark Sone as bad. */
 341                         logger.log(Level.WARNING, "Downloaded Sone %s has no reply likes!", new Object[] { sone });
 342                 } else {
 343                         for (SimpleXML likedReplyIdXml : likeReplyIdsXml.getNodes("reply-like")) {
 344                                 String replyId = likedReplyIdXml.getValue();
 345                                 likedReplyIds.add(replyId);
 346                         }
 347                 }
 348
 349                 /* okay, apparently everything was parsed correctly. Now import. */
 350                 /* atomic setter operation on the Sone. */
 351                 synchronized (sone) {
 352                         sone.setProfile(profile);
 353                         sone.setPosts(posts);
 354                         sone.setReplies(replies);
 355                         sone.setLikePostIds(likedPostIds);
 356                 }
 357
 358                 return sone;
 359         }
 360
 361         //
 362         // SERVICE METHODS
 363         //
 364
 365         /**
 366          * {@inheritDoc}
 367          */
 368         @Override
 369         protected void serviceStop() {
 370                 for (Sone sone : sones) {
 371                         freenetInterface.unregisterUsk(sone);
 372                 }
 373         }
 374
 375 }