cfg_shared_networks.h

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// Copyright (C) 2017-2019 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 CFG_SHARED_NETWORKS_H
#define CFG_SHARED_NETWORKS_H

#include <asiolink/io_address.h>
#include <cc/cfg_to_element.h>
#include <cc/data.h>
#include <exceptions/exceptions.h>
#include <dhcpsrv/shared_network.h>
#include <boost/shared_ptr.hpp>
#include <string>

namespace isc {
namespace dhcp {

template<typename SharedNetworkPtrType, typename SharedNetworkCollection>
class CfgSharedNetworks : public data::CfgToElement {
public:
    const SharedNetworkCollection* getAll() const {
        return (&networks_);
    }

    void add(const SharedNetworkPtrType& network) {
        if (getByName(network->getName())) {
            isc_throw(BadValue, "duplicate network '" << network->getName() <<
                      "' found in the configuration");
        }

        static_cast<void>(networks_.push_back(network));
    }

    void del(const std::string& name) {
        auto& index = networks_.template get<SharedNetworkNameIndexTag>();
        auto shared_network = index.find(name);
        if (shared_network != index.end()) {
            // Delete all subnets from the network
            (*shared_network)->delAll();

            // Then delete the network from the networks list.
            index.erase(shared_network);
        } else {
            isc_throw(BadValue, "unable to delete non-existing network '"
                      << name << "' from shared networks configuration");
        }
    }

    uint64_t del(const uint64_t id) {
        auto& index = networks_.template get<SharedNetworkIdIndexTag>();
        auto sn_range = index.equal_range(id);

        // For each shared network found, dereference the subnets belonging
        // to it.
        for (auto it = sn_range.first; it != sn_range.second; ++it) {
            (*it)->delAll();
        }

        // Remove the shared networks.
        return (static_cast<uint64_t>(index.erase(id)));
    }

    SharedNetworkPtrType getByName(const std::string& name) const {
        const auto& index = networks_.template get<SharedNetworkNameIndexTag>();
        auto shared_network = index.find(name);
        if (shared_network != index.cend()) {
            return (*shared_network);
        }
        return (SharedNetworkPtrType());
    }

    virtual data::ElementPtr toElement() const {
        data::ElementPtr list = data::Element::createList();

        // Insert shared networks sorted by their names into the list.
        const auto& index = networks_.template get<SharedNetworkNameIndexTag>();
        for (auto shared_network = index.begin(); shared_network != index.end();
             ++shared_network) {
            list->add((*shared_network)->toElement());
        }
        return (list);
    }

    void merge(CfgOptionDefPtr cfg_def, CfgSharedNetworks& other) {
        auto& index = networks_.template get<SharedNetworkNameIndexTag>();

        // Iterate over the subnets to be merged. They will replace the existing
        // subnets with the same id. All new subnets will be inserted into this
        // configuration.
        auto other_networks = other.getAll();
        for (auto other_network = other_networks->begin();
            other_network != other_networks->end(); ++other_network) {

            // In theory we should drop subnet assignments from "other". The
            // idea being  those that come from the CB should not have subnets_
            // populated.  We will quietly throw them away, just in case.
            (*other_network)->delAll();

            // Check if the other network exists in this config.
            auto existing_network = index.find((*other_network)->getName());
            if (existing_network != index.end()) {

                // Somehow the same instance is in both, skip it.
                if (*existing_network == *other_network) {
                    continue;
                }

                // Network exists, which means we're updating it.
                // First we need to move its subnets to the new
                // version of the network.
                const auto subnets = (*existing_network)->getAllSubnets();

                auto copy_subnets(*subnets);
                for (auto subnet = copy_subnets.cbegin(); subnet != copy_subnets.cend(); ++subnet) {
                    (*existing_network)->del((*subnet)->getID());
                    (*other_network)->add(*subnet);
                }

                // Now we discard the existing copy of the network.
                index.erase(existing_network);
            }

            // Create the network's options based on the given definitions.
            (*other_network)->getCfgOption()->createOptions(cfg_def);

            // Add the new/updated nework.
            static_cast<void>(networks_.push_back(*other_network));
        }
    }

protected:

    SharedNetworkCollection networks_;
};

class CfgSharedNetworks4 : public CfgSharedNetworks<SharedNetwork4Ptr,
                                                    SharedNetwork4Collection> {
public:
    bool hasNetworkWithServerId(const asiolink::IOAddress& server_id) const;
};

typedef boost::shared_ptr<CfgSharedNetworks4> CfgSharedNetworks4Ptr;

class CfgSharedNetworks6 : public CfgSharedNetworks<SharedNetwork6Ptr,
                                                    SharedNetwork6Collection> {
};

typedef boost::shared_ptr<CfgSharedNetworks6> CfgSharedNetworks6Ptr;


} // end of namespace isc::dhcp
} // end of namespace isc

#endif // CFG_SHARED_NETWORKS_H