src/core/abstractsqlstorage.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2019 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
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  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include "abstractsqlstorage.h"
  22
  23 #include <QMutexLocker>
  24 #include <QSqlDriver>
  25 #include <QSqlError>
  26 #include <QSqlField>
  27 #include <QSqlQuery>
  28
  29 #include "logmessage.h"
  30 #include "quassel.h"
  31
  32 int AbstractSqlStorage::_nextConnectionId = 0;
  33 AbstractSqlStorage::AbstractSqlStorage(QObject *parent)
  34     : Storage(parent),
  35     _schemaVersion(0)
  36 {
  37 }
  38
  39
  40 AbstractSqlStorage::~AbstractSqlStorage()
  41 {
  42     // disconnect the connections, so their deletion is no longer interessting for us
  43     QHash<QThread *, Connection *>::iterator conIter;
  44     for (conIter = _connectionPool.begin(); conIter != _connectionPool.end(); ++conIter) {
  45         QSqlDatabase::removeDatabase(conIter.value()->name());
  46         disconnect(conIter.value(), 0, this, 0);
  47     }
  48 }
  49
  50
  51 QSqlDatabase AbstractSqlStorage::logDb()
  52 {
  53     if (!_connectionPool.contains(QThread::currentThread()))
  54         addConnectionToPool();
  55
  56     QSqlDatabase db = QSqlDatabase::database(_connectionPool[QThread::currentThread()]->name(),false);
  57
  58     if (!db.isOpen()) {
  59         qWarning() << "Database connection" << displayName() << "for thread" << QThread::currentThread() << "was lost, attempting to reconnect...";
  60         dbConnect(db);
  61     }
  62
  63     return db;
  64 }
  65
  66
  67 void AbstractSqlStorage::addConnectionToPool()
  68 {
  69     QMutexLocker locker(&_connectionPoolMutex);
  70     // we have to recheck if the connection pool already contains a connection for
  71     // this thread. Since now (after the lock) we can only tell for sure
  72     if (_connectionPool.contains(QThread::currentThread()))
  73         return;
  74
  75     QThread *currentThread = QThread::currentThread();
  76
  77     int connectionId = _nextConnectionId++;
  78
  79     Connection *connection = new Connection(QLatin1String(QString("quassel_%1_con_%2").arg(driverName()).arg(connectionId).toLatin1()));
  80     connection->moveToThread(currentThread);
  81     connect(this, SIGNAL(destroyed()), connection, SLOT(deleteLater()));
  82     connect(currentThread, SIGNAL(destroyed()), connection, SLOT(deleteLater()));
  83     connect(connection, SIGNAL(destroyed()), this, SLOT(connectionDestroyed()));
  84     _connectionPool[currentThread] = connection;
  85
  86     QSqlDatabase db = QSqlDatabase::addDatabase(driverName(), connection->name());
  87     db.setDatabaseName(databaseName());
  88
  89     if (!hostName().isEmpty())
  90         db.setHostName(hostName());
  91
  92     if (port() != -1)
  93         db.setPort(port());
  94
  95     if (!userName().isEmpty()) {
  96         db.setUserName(userName());
  97         db.setPassword(password());
  98     }
  99
 100     dbConnect(db);
 101 }
 102
 103
 104 void AbstractSqlStorage::dbConnect(QSqlDatabase &db)
 105 {
 106     if (!db.open()) {
 107         quWarning() << "Unable to open database" << displayName() << "for thread" << QThread::currentThread();
 108         quWarning() << "-" << db.lastError().text();
 109     }
 110     else {
 111         if (!initDbSession(db)) {
 112             quWarning() << "Unable to initialize database" << displayName() << "for thread" << QThread::currentThread();
 113             db.close();
 114         }
 115     }
 116 }
 117
 118
 119 Storage::State AbstractSqlStorage::init(const QVariantMap &settings,
 120                                         const QProcessEnvironment &environment,
 121                                         bool loadFromEnvironment)
 122 {
 123     setConnectionProperties(settings, environment, loadFromEnvironment);
 124
 125     _debug = Quassel::isOptionSet("debug");
 126
 127     QSqlDatabase db = logDb();
 128     if (!db.isValid() || !db.isOpen())
 129         return NotAvailable;
 130
 131     if (installedSchemaVersion() == -1) {
 132         qCritical() << "Storage Schema is missing!";
 133         return NeedsSetup;
 134     }
 135
 136     if (installedSchemaVersion() > schemaVersion()) {
 137         qCritical() << "Installed Schema is newer then any known Version.";
 138         return NotAvailable;
 139     }
 140
 141     if (installedSchemaVersion() < schemaVersion()) {
 142         quInfo() << qPrintable(tr("Installed database schema (version %1) is not up to date. Upgrading to "
 143                                   "version %2...  This may take a while for major upgrades."
 144                                  ).arg(installedSchemaVersion()).arg(schemaVersion()));
 145         emit dbUpgradeInProgress(true);
 146         auto upgradeResult = upgradeDb();
 147         emit dbUpgradeInProgress(false);
 148         if (!upgradeResult) {
 149             qWarning() << qPrintable(tr("Upgrade failed..."));
 150             return NotAvailable;
 151         }
 152         // Add a message when migration succeeds to avoid confusing folks by implying the schema upgrade failed if
 153         // later functionality does not work.
 154         quInfo() << qPrintable(tr("Installed database schema successfully upgraded to version %1.").arg(schemaVersion()));
 155     }
 156
 157     quInfo() << qPrintable(displayName()) << "storage backend is ready. Schema version:" << installedSchemaVersion();
 158     return IsReady;
 159 }
 160
 161
 162 QString AbstractSqlStorage::queryString(const QString &queryName, int version)
 163 {
 164     QFileInfo queryInfo;
 165
 166     // The current schema is stored in the root folder, while upgrade queries are stored in the
 167     // 'versions/##' subfolders.
 168     if (version == 0) {
 169         // Use the current SQL schema, not a versioned request
 170         queryInfo = QFileInfo(QString(":/SQL/%1/%2.sql").arg(displayName()).arg(queryName));
 171         // If version is needed later, get it via version = schemaVersion();
 172     } else {
 173         // Use the specified schema version, not the general folder
 174         queryInfo = QFileInfo(QString(":/SQL/%1/version/%2/%3.sql")
 175                               .arg(displayName()).arg(version).arg(queryName));
 176     }
 177
 178     if (!queryInfo.exists() || !queryInfo.isFile() || !queryInfo.isReadable()) {
 179         qCritical() << "Unable to read SQL-Query" << queryName << "for engine" << displayName();
 180         return QString();
 181     }
 182
 183     QFile queryFile(queryInfo.filePath());
 184     if (!queryFile.open(QIODevice::ReadOnly | QIODevice::Text))
 185         return QString();
 186     QString query = QTextStream(&queryFile).readAll();
 187     queryFile.close();
 188
 189     return query.trimmed();
 190 }
 191
 192
 193 QStringList AbstractSqlStorage::setupQueries()
 194 {
 195     QStringList queries;
 196     // The current schema is stored in the root folder, including setup scripts.
 197     QDir dir = QDir(QString(":/SQL/%1/").arg(displayName()));
 198     foreach(QFileInfo fileInfo, dir.entryInfoList(QStringList() << "setup*", QDir::NoFilter, QDir::Name)) {
 199         queries << queryString(fileInfo.baseName());
 200     }
 201     return queries;
 202 }
 203
 204
 205 bool AbstractSqlStorage::setup(const QVariantMap &settings, const QProcessEnvironment &environment,
 206                                bool loadFromEnvironment)
 207 {
 208     setConnectionProperties(settings, environment, loadFromEnvironment);
 209     QSqlDatabase db = logDb();
 210     if (!db.isOpen()) {
 211         qCritical() << "Unable to setup Logging Backend!";
 212         return false;
 213     }
 214
 215     db.transaction();
 216     foreach(QString queryString, setupQueries()) {
 217         QSqlQuery query = db.exec(queryString);
 218         if (!watchQuery(query)) {
 219             qCritical() << "Unable to setup Logging Backend!";
 220             db.rollback();
 221             return false;
 222         }
 223     }
 224     bool success = setupSchemaVersion(schemaVersion());
 225     if (success)
 226         db.commit();
 227     else
 228         db.rollback();
 229     return success;
 230 }
 231
 232
 233 QList<AbstractSqlStorage::SqlQueryResource> AbstractSqlStorage::upgradeQueries(int version)
 234 {
 235     QList<SqlQueryResource> queries;
 236     // Upgrade queries are stored in the 'version/##' subfolders.
 237     QDir dir = QDir(QString(":/SQL/%1/version/%2/").arg(displayName()).arg(version));
 238     foreach(QFileInfo fileInfo, dir.entryInfoList(QStringList() << "upgrade*", QDir::NoFilter, QDir::Name)) {
 239         queries << SqlQueryResource(queryString(fileInfo.baseName(), version), fileInfo.baseName());
 240     }
 241     return queries;
 242 }
 243
 244
 245 bool AbstractSqlStorage::upgradeDb()
 246 {
 247     if (schemaVersion() <= installedSchemaVersion())
 248         return true;
 249
 250     QSqlDatabase db = logDb();
 251
 252     // TODO: For databases that support it (e.g. almost only PostgreSQL), wrap upgrades in a
 253     // transaction.  This will need careful testing of potential additional space requirements and
 254     // any database modifications that might not be allowed in a transaction.
 255
 256     // Check if we're resuming an interrupted multi-step upgrade: is an upgrade step stored?
 257     const QString previousLaunchUpgradeStep = schemaVersionUpgradeStep();
 258     bool resumingUpgrade = !previousLaunchUpgradeStep.isEmpty();
 259
 260     for (int ver = installedSchemaVersion() + 1; ver <= schemaVersion(); ver++) {
 261         foreach (auto queryResource, upgradeQueries(ver)) {
 262             if (resumingUpgrade) {
 263                 // An upgrade was interrupted.  Check if this matches the the last successful query.
 264                 if (previousLaunchUpgradeStep == queryResource.queryFilename) {
 265                     // Found the matching query!
 266                     quInfo() << qPrintable(QString("Resuming interrupted upgrade for schema version %1 (last step: %2)")
 267                                            .arg(QString::number(ver), previousLaunchUpgradeStep));
 268
 269                     // Stop searching for queries
 270                     resumingUpgrade = false;
 271                     // Continue past the previous query with the next not-yet-tried query
 272                     continue;
 273                 }
 274                 else {
 275                     // Not yet matched, keep looking
 276                     continue;
 277                 }
 278             }
 279
 280             // Run the upgrade query
 281             QSqlQuery query = db.exec(queryResource.queryString);
 282             if (!watchQuery(query)) {
 283                 // Individual upgrade query failed, bail out
 284                 qCritical() << qPrintable(QString("Unable to upgrade Logging Backend!  Upgrade query in schema version %1 failed (step: %2).")
 285                                           .arg(QString::number(ver), queryResource.queryFilename));
 286                 return false;
 287             }
 288             else {
 289                 // Mark as successful
 290                 setSchemaVersionUpgradeStep(queryResource.queryFilename);
 291             }
 292         }
 293
 294         if (resumingUpgrade) {
 295             // Something went wrong and the last successful SQL query to resume from couldn't be
 296             // found.
 297             // 1.  The storage of successful query glitched, or the database was manually changed
 298             // 2.  Quassel changed the filenames of upgrade queries, and the local Quassel core
 299             //     version was replaced during an interrupted schema upgrade
 300             //
 301             // Both are unlikely, but it's a good idea to handle it anyways.
 302
 303             qCritical() << qPrintable(QString("Unable to resume interrupted upgrade in Logging "
 304                                               "Backend!  Missing upgrade step in schema version %1 "
 305                                               "(expected step: %2)")
 306                                       .arg(QString::number(ver), previousLaunchUpgradeStep));
 307             return false;
 308         }
 309
 310         // Update the schema version for each intermediate step and mark the step as done.  This
 311         // ensures that any interrupted upgrades have a greater chance of resuming correctly after
 312         // core restart.
 313         //
 314         // Almost all databases make single queries atomic (fully works or fully fails, no partial),
 315         // and with many of the longest migrations being a single query, this makes upgrade
 316         // interruptions much more likely to leave the database in a valid intermediate schema
 317         // version.
 318         if (!updateSchemaVersion(ver, true)) {
 319             // Updating the schema version failed, bail out
 320             qCritical() << "Unable to upgrade Logging Backend!  Setting schema version"
 321                         << ver << "failed.";
 322             return false;
 323         }
 324     }
 325
 326     // Update the schema version for the final step.  Split this out to offer more informative
 327     // logging (though setting schema version really should not fail).
 328     if (!updateSchemaVersion(schemaVersion())) {
 329         // Updating the final schema version failed, bail out
 330         qCritical() << "Unable to upgrade Logging Backend!  Setting final schema version"
 331                     << schemaVersion() << "failed.";
 332         return false;
 333     }
 334
 335     // If we made it here, everything seems to have worked!
 336     return true;
 337 }
 338
 339
 340 int AbstractSqlStorage::schemaVersion()
 341 {
 342     // returns the newest Schema Version!
 343     // not the currently used one! (though it can be the same)
 344     if (_schemaVersion > 0)
 345         return _schemaVersion;
 346
 347     int version;
 348     bool ok;
 349     // Schema versions are stored in the 'version/##' subfolders.
 350     QDir dir = QDir(QString(":/SQL/%1/version/").arg(displayName()));
 351     foreach(QFileInfo fileInfo, dir.entryInfoList()) {
 352         if (!fileInfo.isDir())
 353             continue;
 354
 355         version = fileInfo.fileName().toInt(&ok);
 356         if (!ok)
 357             continue;
 358
 359         if (version > _schemaVersion)
 360             _schemaVersion = version;
 361     }
 362     return _schemaVersion;
 363 }
 364
 365
 366 QString AbstractSqlStorage::schemaVersionUpgradeStep()
 367 {
 368     // By default, assume there's no pending upgrade
 369     return {};
 370 }
 371
 372
 373 bool AbstractSqlStorage::watchQuery(QSqlQuery &query)
 374 {
 375     bool queryError = query.lastError().isValid();
 376     if (queryError || _debug) {
 377         if (queryError)
 378             qCritical() << "unhandled Error in QSqlQuery!";
 379         qCritical() << "                  last Query:\n" << qPrintable(query.lastQuery());
 380         qCritical() << "              executed Query:\n" << qPrintable(query.executedQuery());
 381         QVariantMap boundValues = query.boundValues();
 382         QStringList valueStrings;
 383         QVariantMap::const_iterator iter;
 384         for (iter = boundValues.constBegin(); iter != boundValues.constEnd(); ++iter) {
 385             QString value;
 386             QSqlField field;
 387             if (query.driver()) {
 388                 // let the driver do the formatting
 389                 field.setType(iter.value().type());
 390                 if (iter.value().isNull())
 391                     field.clear();
 392                 else
 393                     field.setValue(iter.value());
 394                 value =  query.driver()->formatValue(field);
 395             }
 396             else {
 397                 switch (iter.value().type()) {
 398                 case QVariant::Invalid:
 399                     value = "NULL";
 400                     break;
 401                 case QVariant::Int:
 402                     value = iter.value().toString();
 403                     break;
 404                 default:
 405                     value = QString("'%1'").arg(iter.value().toString());
 406                 }
 407             }
 408             valueStrings << QString("%1=%2").arg(iter.key(), value);
 409         }
 410         qCritical() << "                bound Values:" << qPrintable(valueStrings.join(", "));
 411         qCritical() << "                Error Number:" << query.lastError().number();
 412         qCritical() << "               Error Message:" << qPrintable(query.lastError().text());
 413         qCritical() << "              Driver Message:" << qPrintable(query.lastError().driverText());
 414         qCritical() << "                  DB Message:" << qPrintable(query.lastError().databaseText());
 415
 416         return !queryError;
 417     }
 418     return true;
 419 }
 420
 421
 422 void AbstractSqlStorage::connectionDestroyed()
 423 {
 424     QMutexLocker locker(&_connectionPoolMutex);
 425     _connectionPool.remove(sender()->thread());
 426 }
 427
 428
 429 // ========================================
 430 //  AbstractSqlStorage::Connection
 431 // ========================================
 432 AbstractSqlStorage::Connection::Connection(const QString &name, QObject *parent)
 433     : QObject(parent),
 434     _name(name.toLatin1())
 435 {
 436 }
 437
 438
 439 AbstractSqlStorage::Connection::~Connection()
 440 {
 441     {
 442         QSqlDatabase db = QSqlDatabase::database(name(), false);
 443         if (db.isOpen()) {
 444             db.commit();
 445             db.close();
 446         }
 447     }
 448     QSqlDatabase::removeDatabase(name());
 449 }
 450
 451
 452 // ========================================
 453 //  AbstractSqlMigrator
 454 // ========================================
 455 AbstractSqlMigrator::AbstractSqlMigrator()
 456     : _query(0)
 457 {
 458 }
 459
 460
 461 void AbstractSqlMigrator::newQuery(const QString &query, QSqlDatabase db)
 462 {
 463     Q_ASSERT(!_query);
 464     _query = new QSqlQuery(db);
 465     _query->prepare(query);
 466 }
 467
 468
 469 void AbstractSqlMigrator::resetQuery()
 470 {
 471     delete _query;
 472     _query = 0;
 473 }
 474
 475
 476 bool AbstractSqlMigrator::exec()
 477 {
 478     Q_ASSERT(_query);
 479     _query->exec();
 480     return !_query->lastError().isValid();
 481 }
 482
 483
 484 QString AbstractSqlMigrator::migrationObject(MigrationObject moType)
 485 {
 486     switch (moType) {
 487     case QuasselUser:
 488         return "QuasselUser";
 489     case Sender:
 490         return "Sender";
 491     case Identity:
 492         return "Identity";
 493     case IdentityNick:
 494         return "IdentityNick";
 495     case Network:
 496         return "Network";
 497     case Buffer:
 498         return "Buffer";
 499     case Backlog:
 500         return "Backlog";
 501     case IrcServer:
 502         return "IrcServer";
 503     case UserSetting:
 504         return "UserSetting";
 505     case CoreState:
 506         return "CoreState";
 507     };
 508     return QString();
 509 }
 510
 511
 512 QVariantList AbstractSqlMigrator::boundValues()
 513 {
 514     QVariantList values;
 515     if (!_query)
 516         return values;
 517
 518     int numValues = _query->boundValues().count();
 519     for (int i = 0; i < numValues; i++) {
 520         values << _query->boundValue(i);
 521     }
 522     return values;
 523 }
 524
 525
 526 void AbstractSqlMigrator::dumpStatus()
 527 {
 528     qWarning() << "  executed Query:";
 529     qWarning() << qPrintable(executedQuery());
 530     qWarning() << "  bound Values:";
 531     QList<QVariant> list = boundValues();
 532     for (int i = 0; i < list.size(); ++i)
 533         qWarning() << i << ": " << list.at(i).toString().toLatin1().data();
 534     qWarning() << "  Error Number:"   << lastError().number();
 535     qWarning() << "  Error Message:"   << lastError().text();
 536 }
 537
 538
 539 // ========================================
 540 //  AbstractSqlMigrationReader
 541 // ========================================
 542 AbstractSqlMigrationReader::AbstractSqlMigrationReader()
 543     : AbstractSqlMigrator(),
 544     _writer(0)
 545 {
 546 }
 547
 548
 549 bool AbstractSqlMigrationReader::migrateTo(AbstractSqlMigrationWriter *writer)
 550 {
 551     if (!transaction()) {
 552         qWarning() << "AbstractSqlMigrationReader::migrateTo(): unable to start reader's transaction!";
 553         return false;
 554     }
 555     if (!writer->transaction()) {
 556         qWarning() << "AbstractSqlMigrationReader::migrateTo(): unable to start writer's transaction!";
 557         rollback(); // close the reader transaction;
 558         return false;
 559     }
 560
 561     _writer = writer;
 562
 563     // due to the incompatibility across Migration objects we can't run this in a loop... :/
 564     QuasselUserMO quasselUserMo;
 565     if (!transferMo(QuasselUser, quasselUserMo))
 566         return false;
 567
 568     IdentityMO identityMo;
 569     if (!transferMo(Identity, identityMo))
 570         return false;
 571
 572     IdentityNickMO identityNickMo;
 573     if (!transferMo(IdentityNick, identityNickMo))
 574         return false;
 575
 576     NetworkMO networkMo;
 577     if (!transferMo(Network, networkMo))
 578         return false;
 579
 580     BufferMO bufferMo;
 581     if (!transferMo(Buffer, bufferMo))
 582         return false;
 583
 584     SenderMO senderMo;
 585     if (!transferMo(Sender, senderMo))
 586         return false;
 587
 588     BacklogMO backlogMo;
 589     if (!transferMo(Backlog, backlogMo))
 590         return false;
 591
 592     IrcServerMO ircServerMo;
 593     if (!transferMo(IrcServer, ircServerMo))
 594         return false;
 595
 596     UserSettingMO userSettingMo;
 597     if (!transferMo(UserSetting, userSettingMo))
 598         return false;
 599
 600     CoreStateMO coreStateMO;
 601     if (!transferMo(CoreState, coreStateMO))
 602         return false;
 603
 604     if (!_writer->postProcess())
 605         abortMigration();
 606     return finalizeMigration();
 607 }
 608
 609
 610 void AbstractSqlMigrationReader::abortMigration(const QString &errorMsg)
 611 {
 612     qWarning() << "Migration Failed!";
 613     if (!errorMsg.isNull()) {
 614         qWarning() << qPrintable(errorMsg);
 615     }
 616     if (lastError().isValid()) {
 617         qWarning() << "ReaderError:";
 618         dumpStatus();
 619     }
 620
 621     if (_writer->lastError().isValid()) {
 622         qWarning() << "WriterError:";
 623         _writer->dumpStatus();
 624     }
 625
 626     rollback();
 627     _writer->rollback();
 628     _writer = 0;
 629 }
 630
 631
 632 bool AbstractSqlMigrationReader::finalizeMigration()
 633 {
 634     resetQuery();
 635     _writer->resetQuery();
 636
 637     commit();
 638     if (!_writer->commit()) {
 639         _writer = 0;
 640         return false;
 641     }
 642     _writer = 0;
 643     return true;
 644 }
 645
 646
 647 template<typename T>
 648 bool AbstractSqlMigrationReader::transferMo(MigrationObject moType, T &mo)
 649 {
 650     resetQuery();
 651     _writer->resetQuery();
 652
 653     if (!prepareQuery(moType)) {
 654         abortMigration(QString("AbstractSqlMigrationReader::migrateTo(): unable to prepare reader query of type %1!").arg(AbstractSqlMigrator::migrationObject(moType)));
 655         return false;
 656     }
 657     if (!_writer->prepareQuery(moType)) {
 658         abortMigration(QString("AbstractSqlMigrationReader::migrateTo(): unable to prepare writer query of type %1!").arg(AbstractSqlMigrator::migrationObject(moType)));
 659         return false;
 660     }
 661
 662     qDebug() << qPrintable(QString("Transferring %1...").arg(AbstractSqlMigrator::migrationObject(moType)));
 663     int i = 0;
 664     QFile file;
 665     file.open(stdout, QIODevice::WriteOnly);
 666
 667     while (readMo(mo)) {
 668         if (!_writer->writeMo(mo)) {
 669             abortMigration(QString("AbstractSqlMigrationReader::transferMo(): unable to transfer Migratable Object of type %1!").arg(AbstractSqlMigrator::migrationObject(moType)));
 670             return false;
 671         }
 672         i++;
 673         if (i % 1000 == 0) {
 674             file.write("*");
 675             file.flush();
 676         }
 677     }
 678     if (i > 1000) {
 679         file.write("\n");
 680         file.flush();
 681     }
 682
 683     qDebug() << "Done.";
 684     return true;
 685 }
 686
 687 uint qHash(const SenderData &key) {
 688     return qHash(QString(key.sender + "\n" + key.realname + "\n" + key.avatarurl));
 689 }
 690
 691 bool operator==(const SenderData &a, const SenderData &b) {
 692     return a.sender == b.sender &&
 693         a.realname == b.realname &&
 694         a.avatarurl == b.avatarurl;
 695 }