// isself.cpp

/**
*    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,
*    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/platform/basic.h"

#include "mongo/base/init.h"
#include "mongo/db/commands.h"
#include "mongo/db/repl/isself.h"

namespace mongo {

using std::string;
using std::stringstream;

class IsSelfCommand : public BasicCommand {
public:
    IsSelfCommand() : BasicCommand("_isSelf") {}
    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
        return AllowedOnSecondary::kAlways;
    }
    virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
        return false;
    }
    std::string help() const override {
        return "{ _isSelf : 1 } INTERNAL ONLY";
    }
    bool requiresAuth() const override {
        return false;
    }
    void addRequiredPrivileges(const std::string& dbname,
                               const BSONObj& cmdObj,
                               std::vector<Privilege>* out) const override {}
    bool run(OperationContext* opCtx,
             const string& dbname,
             const BSONObj& cmdObj,
             BSONObjBuilder& result) {
        result.append("id", repl::instanceId);
        return true;
    }
};

MONGO_INITIALIZER_WITH_PREREQUISITES(RegisterIsSelfCommand, ("GenerateInstanceId"))
(InitializerContext* context) {
    // Leaked intentionally: a Command registers itself when constructed
    new IsSelfCommand();
    return Status::OK();
}

}  // namespace mongo