/**
* Copyright (C) 2009-2015 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.server.service.blob;
import com.foundationdb.Transaction;
import com.foundationdb.blob.SQLBlob;
import com.foundationdb.subspace.Subspace;
import com.foundationdb.directory.DirectorySubspace;
import com.foundationdb.qp.operator.QueryContext;
import com.foundationdb.server.error.LobNotFoundException;
import com.foundationdb.server.error.LobContentException;
import com.foundationdb.server.error.LobDuplicateException;
import com.foundationdb.TransactionContext;
import com.foundationdb.server.service.session.Session;
import com.foundationdb.server.service.Service;
import com.foundationdb.server.service.ServiceManager;
import com.foundationdb.server.service.security.SecurityService;
import com.foundationdb.server.service.transaction.TransactionService;
import com.foundationdb.server.store.FDBHolder;
import com.foundationdb.server.store.FDBTransactionService;
import com.foundationdb.tuple.Tuple2;
import com.google.inject.Inject;
import java.util.Arrays;
import java.util.UUID;
public class FDBLobService implements Service, LobService {
private static byte[] LOB_EXISTS = {0x01};
private DirectorySubspace lobDirectory;
private FDBHolder fdbHolder;
private FDBTransactionService transactionService;
private final SecurityService securityService;
private final ServiceManager serviceManager;
private final String LOB_DIRECTORY = "lobs";
@Inject
public FDBLobService(ServiceManager serviceManager, SecurityService securityService) {
this.serviceManager = serviceManager;
this.securityService = securityService;
}
@Override
public void createNewLob(Session session, final UUID lobId) {
if (existsLob(session, lobId)) {
throw new LobDuplicateException(lobId.toString());
}
getTxc(session).set(getLobSubspace(lobId).pack(), LOB_EXISTS);
transactionService.addCallback(session, TransactionService.CallbackType.PRE_COMMIT, new TransactionService.Callback() {
@Override
public void run(Session session, long timestamp) {
try {
SQLBlob blob = openBlob(session, lobId);
if (!(blob.isLinked(getTxc(session))).get()) {
deleteLob(session, lobId);
}
} catch (LobNotFoundException le) {
// lob already gone
}
}
});
}
@Override
public boolean existsLob(Session session, UUID lobId) {
return getTxc(session).get(getLobSubspace(lobId).pack()).get() != null;
}
@Override
public void deleteLob(Session session, UUID lobId) {
// clear content
getTxc(session).clear(getLobSubspace(lobId).range());
// clear existence value
getTxc(session).clear(getLobSubspace(lobId).pack());
}
@Override
public void linkTableBlob(final Session session, final UUID lobId, final int tableId) {
Transaction tr = getTxc(session);
SQLBlob blob = openBlob(session, lobId);
if (blob.isLinked(tr).get()) {
if (blob.getLinkedTable(tr).get() != tableId) {
throw new LobContentException("lob is already linked to a table");
}
return;
}
blob.setLinkedTable(tr, tableId).get();
}
@Override
public long sizeBlob(final Session session, final UUID lobId) {
SQLBlob blob = openBlob(session, lobId);
return blob.getSize(getTxc(session)).get();
}
@Override
public byte[] readBlob(final Session session, final UUID lobId, final long offset, final int length) {
SQLBlob blob = openBlob(session, lobId);
byte[] res = blob.read(getTxc(session), offset, length).get();
return res != null ? res : new byte[]{};
}
@Override
public byte[] readBlob(final Session session, final UUID lobId) {
SQLBlob blob = openBlob(session, lobId);
return blob.read(getTxc(session)).get();
}
@Override
public void writeBlob(final Session session, final UUID lobId, final long offset, final byte[] data) {
SQLBlob blob = openBlob(session, lobId);
blob.write(getTxc(session), offset, data).get();
}
@Override
public void appendBlob(final Session session, final UUID lobId, final byte[] data) {
SQLBlob blob = openBlob(session, lobId);
blob.append(getTxc(session), data).get();
}
@Override
public void truncateBlob(final Session session, final UUID lobId, final long size) {
SQLBlob blob = openBlob(session, lobId);
blob.truncate(getTxc(session), size).get();
}
@Override
public void clearAllLobs(Session session) {
TransactionContext txc = getTxc(session);
lobDirectory.removeIfExists(txc).get();
lobDirectory = fdbHolder.getRootDirectory().create(txc, Arrays.asList(LOB_DIRECTORY)).get();
}
@Override
public void verifyAccessPermission(final Session session, final QueryContext context, final UUID lobId) {
SQLBlob blob = openBlob(session, lobId);
Integer tableId = blob.getLinkedTable(getTxc(session)).get();
if (tableId == null) {
return;
}
String schemaName = context.getServiceManager().getSchemaManager().getAis(context.getSession()).getTable(tableId).getName().getSchemaName();
if (!securityService.isAccessible(context.getSession(), schemaName)) {
throw new LobNotFoundException(lobId.toString());
}
}
private SQLBlob openBlob(Session session, UUID lobId) {
if(existsLob(session, lobId)) {
return new SQLBlob(getLobSubspace(lobId));
}
else {
throw new LobNotFoundException(lobId.toString());
}
}
private Subspace getLobSubspace(UUID lobId) {
Tuple2 tuple = new Tuple2();
return lobDirectory.get(tuple.add(lobId));
}
private Transaction getTxc(Session session) {
return transactionService.getTransaction(session).getTransaction();
}
@Override
public void start() {
this.fdbHolder = serviceManager.getServiceByClass(FDBHolder.class);
TransactionService ts = serviceManager.getServiceByClass(TransactionService.class);
if (ts instanceof FDBTransactionService) {
this.transactionService = (FDBTransactionService)ts;
}
this.lobDirectory = fdbHolder.getRootDirectory().createOrOpen(fdbHolder.getTransactionContext(), Arrays.asList(LOB_DIRECTORY)).get();
}
@Override
public void stop() {
}
@Override
public void crash() {
stop();
}
}