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/*
* Copyright (C) 2016 Christian Mollekopf <mollekopf@kolabsys.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "changereplay.h"
#include "entitybuffer.h"
#include "log.h"
#include "definitions.h"
#include "bufferutils.h"
#include <QTimer>
using namespace Sink;
using namespace Sink::Storage;
SINK_DEBUG_AREA("changereplay");
ChangeReplay::ChangeReplay(const ResourceContext &resourceContext)
: mStorage(storageLocation(), resourceContext.instanceId(), DataStore::ReadOnly), mChangeReplayStore(storageLocation(), resourceContext.instanceId() + ".changereplay", DataStore::ReadWrite), mReplayInProgress(false)
{
SinkTrace() << "Created change replay: " << resourceContext.instanceId();
}
qint64 ChangeReplay::getLastReplayedRevision()
{
qint64 lastReplayedRevision = 0;
auto replayStoreTransaction = mChangeReplayStore.createTransaction(DataStore::ReadOnly);
replayStoreTransaction.openDatabase().scan("lastReplayedRevision",
[&lastReplayedRevision](const QByteArray &key, const QByteArray &value) -> bool {
lastReplayedRevision = value.toLongLong();
return false;
},
[](const DataStore::Error &) {});
return lastReplayedRevision;
}
bool ChangeReplay::allChangesReplayed()
{
const qint64 topRevision = DataStore::maxRevision(mStorage.createTransaction(DataStore::ReadOnly, [](const Sink::Storage::DataStore::Error &error) {
SinkWarning() << error.message;
}));
const qint64 lastReplayedRevision = getLastReplayedRevision();
SinkTrace() << "All changes replayed " << topRevision << lastReplayedRevision;
return (lastReplayedRevision >= topRevision);
}
void ChangeReplay::recordReplayedRevision(qint64 revision)
{
auto replayStoreTransaction = mChangeReplayStore.createTransaction(DataStore::ReadWrite, [](const Sink::Storage::DataStore::Error &error) {
SinkWarning() << error.message;
});
replayStoreTransaction.openDatabase().write("lastReplayedRevision", QByteArray::number(revision));
replayStoreTransaction.commit();
};
KAsync::Job<void> ChangeReplay::replayNextRevision()
{
Q_ASSERT(!mReplayInProgress);
auto lastReplayedRevision = QSharedPointer<qint64>::create(0);
auto topRevision = QSharedPointer<qint64>::create(0);
emit replayingChanges();
return KAsync::syncStart<void>([this, lastReplayedRevision, topRevision]() {
mReplayInProgress = true;
mMainStoreTransaction = mStorage.createTransaction(DataStore::ReadOnly, [](const Sink::Storage::DataStore::Error &error) {
SinkWarning() << error.message;
});
auto replayStoreTransaction = mChangeReplayStore.createTransaction(DataStore::ReadOnly, [](const Sink::Storage::DataStore::Error &error) {
SinkWarning() << error.message;
});
replayStoreTransaction.openDatabase().scan("lastReplayedRevision",
[lastReplayedRevision](const QByteArray &key, const QByteArray &value) -> bool {
*lastReplayedRevision = value.toLongLong();
return false;
},
[](const DataStore::Error &) {});
*topRevision = DataStore::maxRevision(mMainStoreTransaction);
SinkTrace() << "Changereplay from " << *lastReplayedRevision << " to " << *topRevision;
})
.then(KAsync::dowhile(
[this, lastReplayedRevision, topRevision]() -> KAsync::Job<KAsync::ControlFlowFlag> {
if (*lastReplayedRevision >= *topRevision) {
return KAsync::value(KAsync::Break);
}
qint64 revision = *lastReplayedRevision + 1;
KAsync::Job<void> replayJob = KAsync::null<void>();
while (revision <= *topRevision) {
const auto uid = DataStore::getUidFromRevision(mMainStoreTransaction, revision);
const auto type = DataStore::getTypeFromRevision(mMainStoreTransaction, revision);
const auto key = DataStore::assembleKey(uid, revision);
bool exitLoop = false;
DataStore::mainDatabase(mMainStoreTransaction, type)
.scan(key,
[&lastReplayedRevision, type, this, &replayJob, &exitLoop, revision](const QByteArray &key, const QByteArray &value) -> bool {
SinkTrace() << "Replaying " << key;
if (canReplay(type, key, value)) {
replayJob = replay(type, key, value).then<void>([this, revision, lastReplayedRevision](const KAsync::Error &error) {
if (error) {
SinkTrace() << "Change replay failed" << revision;
return KAsync::error(error);
} else {
recordReplayedRevision(revision);
*lastReplayedRevision = revision;
}
return KAsync::null();
});
exitLoop = true;
} else {
*lastReplayedRevision = revision;
}
return false;
},
[key](const DataStore::Error &) { SinkError() << "Failed to replay change " << key; });
if (exitLoop) {
break;
}
revision++;
}
return replayJob.then<KAsync::ControlFlowFlag>([this, revision, lastReplayedRevision, topRevision](const KAsync::Error &error) ->KAsync::Job<KAsync::ControlFlowFlag> {
if (error) {
SinkTrace() << "Change replay failed" << revision;
//We're probably not online or so, so postpone retrying
return KAsync::value(KAsync::Break);
} else {
SinkTrace() << "Replayed until " << revision;
recordReplayedRevision(*lastReplayedRevision);
if (*lastReplayedRevision < *topRevision) {
return KAsync::wait(0).then(KAsync::value(KAsync::Continue));
} else {
return KAsync::value(KAsync::Break);
}
}
//We shouldn't ever get here
Q_ASSERT(false);
return KAsync::value(KAsync::Break);
});
}))
.syncThen<void>([this, lastReplayedRevision]() {
recordReplayedRevision(*lastReplayedRevision);
mMainStoreTransaction.abort();
if (ChangeReplay::allChangesReplayed()) {
mReplayInProgress = false;
//In case we have a derived implementation
if (allChangesReplayed()) {
emit changesReplayed();
}
} else {
QTimer::singleShot(0, [this]() {
mReplayInProgress = false;
replayNextRevision().exec();
});
}
});
}
void ChangeReplay::revisionChanged()
{
if (!mReplayInProgress) {
replayNextRevision().exec();
}
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundefined-reinterpret-cast"
#include "moc_changereplay.cpp"
#pragma clang diagnostic pop
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