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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
* Department, University Hospital of Liege, Belgium
* Copyright (C) 2017-2023 Osimis S.A., Belgium
* Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
*
* 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/>.
**/
#include "MySQLStorageArea.h"
#include "../../Framework/Common/BinaryStringValue.h"
#include "../../Framework/MySQL/MySQLDatabase.h"
#include "../../Framework/MySQL/MySQLTransaction.h"
#include "MySQLDefinitions.h"
#include <Compatibility.h> // For std::unique_ptr<>
#include <Logging.h>
#include <boost/math/special_functions/round.hpp>
namespace OrthancDatabases
{
void MySQLStorageArea::ConfigureDatabase(MySQLDatabase& db,
const MySQLParameters& parameters,
bool clearAll)
{
{
MySQLDatabase::TransientAdvisoryLock lock(db, MYSQL_LOCK_DATABASE_SETUP);
MySQLTransaction t(db, TransactionType_ReadWrite);
int64_t size;
if (db.LookupGlobalIntegerVariable(size, "max_allowed_packet"))
{
int mb = boost::math::iround(static_cast<double>(size) /
static_cast<double>(1024 * 1024));
LOG(WARNING) << "Your MySQL server cannot "
<< "store DICOM files larger than " << mb << "MB";
LOG(WARNING) << " => Consider increasing \"max_allowed_packet\" "
<< "in \"my.cnf\" if this limit is insufficient for your use";
}
else
{
LOG(WARNING) << "Unable to auto-detect the maximum size of DICOM "
<< "files that can be stored in this MySQL server";
}
if (clearAll)
{
db.ExecuteMultiLines("DROP TABLE IF EXISTS StorageArea", false);
}
db.ExecuteMultiLines("CREATE TABLE IF NOT EXISTS StorageArea("
"uuid VARCHAR(64) NOT NULL PRIMARY KEY,"
"content LONGBLOB NOT NULL,"
"type INTEGER NOT NULL)", false);
t.Commit();
}
/**
* WARNING: This lock must be acquired after
* "MYSQL_LOCK_DATABASE_SETUP" is released. Indeed, in MySQL <
* 5.7, it is impossible to acquire more than one lock at a time,
* as calling "SELECT GET_LOCK()" releases all the
* previously-acquired locks.
* https://dev.mysql.com/doc/refman/5.7/en/locking-functions.html
**/
if (parameters.HasLock())
{
db.AdvisoryLock(MYSQL_LOCK_STORAGE);
}
}
MySQLStorageArea::MySQLStorageArea(const MySQLParameters& parameters,
bool clearAll) :
StorageBackend(MySQLDatabase::CreateDatabaseFactory(parameters),
parameters.GetMaxConnectionRetries())
{
{
AccessorBase accessor(*this);
MySQLDatabase& database = dynamic_cast<MySQLDatabase&>(accessor.GetManager().GetDatabase());
ConfigureDatabase(database, parameters, clearAll);
}
}
class MySQLStorageArea::Accessor : public StorageBackend::AccessorBase
{
public:
explicit Accessor(MySQLStorageArea& backend) :
AccessorBase(backend)
{
}
virtual void ReadRange(IFileContentVisitor& visitor,
const std::string& uuid,
OrthancPluginContentType type,
uint64_t start,
size_t length) ORTHANC_OVERRIDE
{
DatabaseManager::Transaction transaction(GetManager(), TransactionType_ReadOnly);
{
// https://stackoverflow.com/a/6545557/881731
DatabaseManager::CachedStatement statement(
STATEMENT_FROM_HERE, GetManager(),
"SELECT SUBSTRING(content, ${start}, ${length}) FROM StorageArea WHERE uuid=${uuid} AND type=${type}");
statement.SetParameterType("uuid", ValueType_Utf8String);
statement.SetParameterType("type", ValueType_Integer64);
statement.SetParameterType("start", ValueType_Integer64);
statement.SetParameterType("length", ValueType_Integer64);
Dictionary args;
args.SetUtf8Value("uuid", uuid);
args.SetIntegerValue("type", type);
args.SetIntegerValue("length", length);
/**
* "For all forms of SUBSTRING(), the position of the first
* character in the string from which the substring is to be
* extracted is reckoned as 1." => hence the "+ 1"
* https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring
**/
args.SetIntegerValue("start", start + 1);
statement.Execute(args);
if (statement.IsDone())
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_UnknownResource);
}
else if (statement.GetResultFieldsCount() != 1)
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
}
else
{
const IValue& value = statement.GetResultField(0);
if (value.GetType() == ValueType_BinaryString)
{
const std::string& content = dynamic_cast<const BinaryStringValue&>(value).GetContent();
if (static_cast<uint64_t>(content.size()) == length)
{
visitor.Assign(content);
}
else
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_BadRange);
}
}
else
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
}
}
}
transaction.Commit();
if (!visitor.IsSuccess())
{
throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Could not read range from the storage area");
}
}
};
StorageBackend::IAccessor* MySQLStorageArea::CreateAccessor()
{
return new Accessor(*this);
}
}
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