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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 "storage/key.h"
#include <QTimer>
using namespace Sink;
using namespace Sink::Storage;
ChangeReplay::ChangeReplay(const ResourceContext &resourceContext, const Sink::Log::Context &ctx)
: mStorage(storageLocation(), resourceContext.instanceId(), DataStore::ReadOnly), mChangeReplayStore(storageLocation(), resourceContext.instanceId() + ".changereplay", DataStore::ReadWrite), mReplayInProgress(false), mLogCtx{ctx.subContext("changereplay")}
{
}
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, [this](const Sink::Storage::DataStore::Error &error) {
SinkWarningCtx(mLogCtx) << error.message;
}));
const qint64 lastReplayedRevision = getLastReplayedRevision();
return (lastReplayedRevision >= topRevision);
}
void ChangeReplay::recordReplayedRevision(qint64 revision)
{
auto replayStoreTransaction = mChangeReplayStore.createTransaction(DataStore::ReadWrite, [this](const Sink::Storage::DataStore::Error &error) {
SinkWarningCtx(mLogCtx) << error.message;
});
replayStoreTransaction.openDatabase().write("lastReplayedRevision", QByteArray::number(revision));
replayStoreTransaction.commit();
};
KAsync::Job<void> ChangeReplay::replayNextRevision()
{
Q_ASSERT(!mReplayInProgress);
return KAsync::start<void>([this]() {
if (mReplayInProgress) {
SinkErrorCtx(mLogCtx) << "Replay still in progress!!!!!";
return KAsync::null<void>();
}
auto lastReplayedRevision = QSharedPointer<qint64>::create(0);
auto topRevision = QSharedPointer<qint64>::create(0);
emit replayingChanges();
mReplayInProgress = true;
mMainStoreTransaction = mStorage.createTransaction(DataStore::ReadOnly, [this](const DataStore::Error &error) {
SinkWarningCtx(mLogCtx) << error.message;
});
auto replayStoreTransaction = mChangeReplayStore.createTransaction(DataStore::ReadOnly, [this](const DataStore::Error &error) {
SinkWarningCtx(mLogCtx) << error.message;
});
Q_ASSERT(mMainStoreTransaction);
Q_ASSERT(replayStoreTransaction);
replayStoreTransaction.openDatabase().scan("lastReplayedRevision",
[lastReplayedRevision](const QByteArray &key, const QByteArray &value) -> bool {
*lastReplayedRevision = value.toLongLong();
return false;
},
[](const DataStore::Error &) {});
*topRevision = DataStore::maxRevision(mMainStoreTransaction);
if (*lastReplayedRevision >= *topRevision) {
SinkTraceCtx(mLogCtx) << "Nothing to replay";
return KAsync::null();
}
SinkTraceCtx(mLogCtx) << "Changereplay from " << *lastReplayedRevision << " to " << *topRevision;
return KAsync::doWhile(
[this, lastReplayedRevision, topRevision]() -> KAsync::Job<KAsync::ControlFlowFlag> {
if (*lastReplayedRevision >= *topRevision) {
SinkTraceCtx(mLogCtx) << "Done replaying" << *lastReplayedRevision << *topRevision;
return KAsync::value(KAsync::Break);
}
Q_ASSERT(mMainStoreTransaction);
auto replayJob = KAsync::null();
qint64 revision = *lastReplayedRevision + 1;
while (revision <= *topRevision) {
const auto uid = DataStore::getUidFromRevision(mMainStoreTransaction, revision);
const auto type = DataStore::getTypeFromRevision(mMainStoreTransaction, revision);
if (uid.isEmpty() || type.isEmpty()) {
SinkErrorCtx(mLogCtx) << "Failed to read uid or type for revison: " << revision << uid << type;
} else {
//const auto key = DataStore::assembleKey(uid, revision);
// TODO: should not use internal representations
const auto key = Storage::Key(Storage::Identifier::fromDisplayByteArray(uid), revision).toInternalByteArray();
QByteArray entityBuffer;
DataStore::mainDatabase(mMainStoreTransaction, type)
.scan(key,
[&entityBuffer](const QByteArray &key, const QByteArray &value) -> bool {
entityBuffer = value;
return false;
},
[this, key](const DataStore::Error &) { SinkErrorCtx(mLogCtx) << "Failed to read the entity buffer " << key; });
if (entityBuffer.isEmpty()) {
SinkErrorCtx(mLogCtx) << "Failed to replay change " << key;
} else {
if (canReplay(type, key, entityBuffer)) {
SinkTraceCtx(mLogCtx) << "Replaying " << key;
replayJob = replay(type, key, entityBuffer);
//Set the last revision we tried to replay
*lastReplayedRevision = revision;
//Execute replay job and commit
break;
} else {
SinkTraceCtx(mLogCtx) << "Not replaying " << key;
//We silently skip over revisions that cannot be replayed, as this is not an error.
}
}
}
//Bump the revision if we failed to even attempt to replay. This will simply skip over those revisions, as we can't recover from those situations.
*lastReplayedRevision = revision;
revision++;
}
return replayJob.then([=](const KAsync::Error &error) {
if (error) {
SinkWarningCtx(mLogCtx) << "Change replay failed: " << error << "Last replayed revision: " << *lastReplayedRevision;
//We're probably not online or so, so postpone retrying
return KAsync::value(KAsync::Break).then(KAsync::error<KAsync::ControlFlowFlag>(error));
}
SinkTraceCtx(mLogCtx) << "Replayed until: " << *lastReplayedRevision;
recordReplayedRevision(*lastReplayedRevision);
reportProgress(*lastReplayedRevision, *topRevision);
const bool gotMoreToReplay = (*lastReplayedRevision < *topRevision);
if (gotMoreToReplay) {
SinkTraceCtx(mLogCtx) << "Replaying some more...";
//Replay more if we have more
return KAsync::wait(0).then(KAsync::value(KAsync::Continue));
} else {
return KAsync::value(KAsync::Break);
}
}).guard(&mGuard);
});
})
.then([this](const KAsync::Error &error) {
SinkTraceCtx(mLogCtx) << "Change replay complete.";
if (error) {
SinkWarningCtx(mLogCtx) << "Error during change replay: " << error;
}
mMainStoreTransaction.abort();
mReplayInProgress = false;
if (ChangeReplay::allChangesReplayed()) {
//In case we have a derived implementation
if (allChangesReplayed()) {
SinkTraceCtx(mLogCtx) << "All changes replayed";
emit changesReplayed();
}
}
if (error) {
return KAsync::error(error);
} else {
return KAsync::null();
}
}).guard(&mGuard);
}
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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