/** @file touch.cpp
    compaction of deleted space in pdfiles (datafiles)
*/

/**
 *    Copyright (C) 2012 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,b
 *    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/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/pch.h"

#include <string>
#include <vector>

#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/commands.h"
#include "mongo/db/curop-inl.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/storage/extent.h"
#include "mongo/db/storage/extent_manager.h"
#include "mongo/db/storage/mmap_v1/dur_transaction.h"
#include "mongo/util/timer.h"
#include "mongo/util/touch_pages.h"

namespace mongo {

    class TouchCmd : public Command {
    public:
        virtual bool isWriteCommandForConfigServer() const { return false; }
        virtual bool adminOnly() const { return false; }
        virtual bool slaveOk() const { return true; }
        virtual bool maintenanceMode() const { return true; }
        virtual void help( stringstream& help ) const {
            help << "touch collection\n"
                "Page in all pages of memory containing every extent for the given collection\n"
                "{ touch : <collection_name>, [data : true] , [index : true] }\n"
                " at least one of data or index must be true; default is both are false\n";
        }
        virtual void addRequiredPrivileges(const std::string& dbname,
                                           const BSONObj& cmdObj,
                                           std::vector<Privilege>* out) {
            ActionSet actions;
            actions.addAction(ActionType::touch);
            out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
        }
        TouchCmd() : Command("touch") { }

        virtual bool run(const string& dbname,
                         BSONObj& cmdObj,
                         int,
                         string& errmsg,
                         BSONObjBuilder& result,
                         bool fromRepl) {
            string coll = cmdObj.firstElement().valuestr();
            if( coll.empty() || dbname.empty() ) {
                errmsg = "no collection name specified";
                return false;
            }

            NamespaceString nss( dbname, coll );
            if ( ! nss.isNormal() ) {
                errmsg = "bad namespace name";
                return false;
            }

            bool touch_indexes( cmdObj["index"].trueValue() );
            bool touch_data( cmdObj["data"].trueValue() );

            if ( ! (touch_indexes || touch_data) ) {
                errmsg = "must specify at least one of (data:true, index:true)";
                return false;
            }

            Client::ReadContext context( nss.ns() );
            DurTransaction txn;

            Database* db = context.ctx().db();
            Collection* collection = db->getCollection( nss.ns() );
            if ( !collection ) {
                errmsg = "collection not found";
                return false;
            }

            return appendCommandStatus( result,
                                        collection->touch( &txn,
                                                           touch_data, touch_indexes,
                                                           &result ) );
        }

    };
    static TouchCmd touchCmd;
}
