ParameterDeserializationPolicy.java example

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voltdb-master
/* This file is part of VoltDB.
 * Copyright (C) 2008-2017 VoltDB Inc.
 *
 * 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 VoltDB.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.voltdb;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;

import org.voltdb.AuthSystem.AuthUser;
import org.voltdb.catalog.Procedure;

/**
 * Check if the parameters of the sysproc can be deserialized successfully.
 */
public class ParameterDeserializationPolicy extends InvocationValidationPolicy {
    public ParameterDeserializationPolicy(boolean isOn) {
        super(isOn);
    }

    @Override
    public ClientResponseImpl shouldAccept(AuthUser user,
            StoredProcedureInvocation invocation,
            Procedure proc) {
        if (! proc.getSystemproc()) {
            return null;
        }

        try {
            invocation.getParams();
        } catch (RuntimeException e) {
            Writer result = new StringWriter();
            PrintWriter pw = new PrintWriter(result);
            e.printStackTrace(pw);
            return new ClientResponseImpl(ClientResponseImpl.GRACEFUL_FAILURE,
                    new VoltTable[0],
                    "Exception while deserializing procedure params\n" +
                            result.toString(),
                            invocation.clientHandle);
        }
        return null;
    }
}