lease_mgr.h

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// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef LEASE_MGR_H
#define LEASE_MGR_H

#include <asiolink/io_address.h>
#include <asiolink/io_service.h>
#include <database/db_exceptions.h>
#include <dhcp/duid.h>
#include <dhcp/option.h>
#include <dhcp/hwaddr.h>
#include <dhcpsrv/lease.h>
#include <dhcpsrv/subnet.h>

#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>

#include <fstream>
#include <iostream>
#include <map>
#include <string>
#include <utility>
#include <vector>

namespace isc {
namespace dhcp {

typedef std::pair<uint32_t, uint32_t> VersionPair;

class LeasePageSize {
public:

    explicit LeasePageSize(const size_t page_size);

    const size_t page_size_; 
};

struct LeaseStatsRow {
    LeaseStatsRow() :
        subnet_id_(0), lease_type_(Lease::TYPE_NA),
        lease_state_(Lease::STATE_DEFAULT), state_count_(0) {
    }

    LeaseStatsRow(const SubnetID& subnet_id, const uint32_t lease_state,
                  const int64_t state_count)
        : subnet_id_(subnet_id), lease_type_(Lease::TYPE_NA),
          lease_state_(lease_state), state_count_(state_count) {
    }

    LeaseStatsRow(const SubnetID& subnet_id, const Lease::Type& lease_type,
                  const uint32_t lease_state, const int64_t state_count)
        : subnet_id_(subnet_id), lease_type_(lease_type),
          lease_state_(lease_state), state_count_(state_count) {
    }

    bool operator< (const LeaseStatsRow &rhs) const {
        if (subnet_id_ < rhs.subnet_id_) {
            return (true);
        }

        if (subnet_id_ == rhs.subnet_id_ &&
            lease_type_ < rhs.lease_type_) {
                return (true);
        }

        if (subnet_id_ == rhs.subnet_id_ &&
            lease_type_ == rhs.lease_type_ &&
            lease_state_ < rhs.lease_state_) {
                return (true);
        }

        return (false);
    }

    SubnetID subnet_id_;
    Lease::Type lease_type_;
    uint32_t lease_state_;
    int64_t state_count_;
};

class LeaseStatsQuery {
public:
    typedef enum {
        ALL_SUBNETS,
        SINGLE_SUBNET,
        SUBNET_RANGE
    } SelectMode;

    LeaseStatsQuery();

    LeaseStatsQuery(const SubnetID& subnet_id);

    LeaseStatsQuery(const SubnetID& first_subnet_id, const SubnetID& last_subnet_id);

    virtual ~LeaseStatsQuery() {};

    virtual void start() {};

    virtual bool getNextRow(LeaseStatsRow& row);

    SubnetID getFirstSubnetID() const {
        return (first_subnet_id_);
    };

    SubnetID getLastSubnetID() const {
        return (last_subnet_id_);
    };

    SelectMode getSelectMode() const {
        return (select_mode_);
    };

protected:
    SubnetID first_subnet_id_;

    SubnetID last_subnet_id_;

private:
    SelectMode select_mode_;
};

typedef boost::shared_ptr<LeaseStatsQuery> LeaseStatsQueryPtr;

typedef boost::shared_ptr<LeaseStatsRow> LeaseStatsRowPtr;

class LeaseMgr {
public:
    LeaseMgr()
    {}

    virtual ~LeaseMgr()
    {}

    static std::string getDBVersion();

    virtual bool addLease(const Lease4Ptr& lease) = 0;

    virtual bool addLease(const Lease6Ptr& lease) = 0;

    virtual Lease4Ptr getLease4(const isc::asiolink::IOAddress& addr) const = 0;

    virtual Lease4Collection getLease4(const isc::dhcp::HWAddr& hwaddr) const = 0;

    virtual Lease4Ptr getLease4(const isc::dhcp::HWAddr& hwaddr,
                                SubnetID subnet_id) const = 0;

    virtual Lease4Collection getLease4(const ClientId& clientid) const = 0;

    virtual Lease4Ptr getLease4(const ClientId& clientid,
                                SubnetID subnet_id) const = 0;

    virtual Lease4Collection getLeases4(SubnetID subnet_id) const = 0;

    virtual Lease4Collection getLeases4(const std::string& hostname) const = 0;

    virtual Lease4Collection getLeases4() const = 0;

    virtual Lease4Collection
    getLeases4(const asiolink::IOAddress& lower_bound_address,
               const LeasePageSize& page_size) const = 0;

    virtual Lease6Ptr getLease6(Lease::Type type,
                                const isc::asiolink::IOAddress& addr) const = 0;

    virtual Lease6Collection getLeases6(Lease::Type type, const DUID& duid,
                                        uint32_t iaid) const = 0;

    virtual Lease6Collection getLeases6(Lease::Type type, const DUID& duid,
                                        uint32_t iaid, SubnetID subnet_id) const = 0;

    Lease6Ptr getLease6(Lease::Type type, const DUID& duid,
                        uint32_t iaid, SubnetID subnet_id) const;

    virtual Lease6Collection getLeases6(SubnetID subnet_id) const = 0;

    virtual Lease6Collection getLeases6(const std::string& hostname) const = 0;

    virtual Lease6Collection getLeases6() const = 0;

    virtual Lease6Collection getLeases6(const DUID& duid) const = 0;

    virtual Lease6Collection
    getLeases6(const asiolink::IOAddress& lower_bound_address,
               const LeasePageSize& page_size) const = 0;

    virtual void getExpiredLeases4(Lease4Collection& expired_leases,
                                   const size_t max_leases) const = 0;

    virtual void getExpiredLeases6(Lease6Collection& expired_leases,
                                   const size_t max_leases) const = 0;

    virtual void updateLease4(const Lease4Ptr& lease4) = 0;

    virtual void updateLease6(const Lease6Ptr& lease6) = 0;

    virtual bool deleteLease(const Lease4Ptr& lease) = 0;

    virtual bool deleteLease(const Lease6Ptr& lease) = 0;

    virtual uint64_t deleteExpiredReclaimedLeases4(const uint32_t secs) = 0;

    virtual uint64_t deleteExpiredReclaimedLeases6(const uint32_t secs) = 0;

    void recountLeaseStats4();

    virtual LeaseStatsQueryPtr startLeaseStatsQuery4();

    virtual LeaseStatsQueryPtr startSubnetLeaseStatsQuery4(const SubnetID& subnet_id);

    virtual LeaseStatsQueryPtr startSubnetRangeLeaseStatsQuery4(const SubnetID& first_subnet_id,
                                                                const SubnetID& last_subnet_id);

    void recountLeaseStats6();

    virtual LeaseStatsQueryPtr startLeaseStatsQuery6();

    virtual LeaseStatsQueryPtr startSubnetLeaseStatsQuery6(const SubnetID& subnet_id);

    virtual LeaseStatsQueryPtr startSubnetRangeLeaseStatsQuery6(const SubnetID& first_subnet_id,
                                                                const SubnetID& last_subnet_id);

    virtual size_t wipeLeases4(const SubnetID& subnet_id) = 0;

    virtual size_t wipeLeases6(const SubnetID& subnet_id) = 0;

    virtual std::string getType() const = 0;

    virtual std::string getName() const = 0;

    virtual std::string getDescription() const = 0;

    virtual VersionPair getVersion() const = 0;

    virtual void commit() = 0;

    virtual void rollback() = 0;

    static void setIOService(const isc::asiolink::IOServicePtr& io_service) {
        io_service_ = io_service;
    }

    static isc::asiolink::IOServicePtr& getIOService() {
        return (io_service_);
    }

private:
    static isc::asiolink::IOServicePtr io_service_;
};

}  // namespace dhcp
}  // namespace isc

#endif // LEASE_MGR_H