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// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.network.guru;

import javax.ejb.Local;
import javax.inject.Inject;

import org.apache.log4j.Logger;

import com.cloud.dc.DataCenter;
import com.cloud.dc.Vlan.VlanType;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.dc.dao.VlanDao;
import com.cloud.deploy.DeployDestination;
import com.cloud.deploy.DeploymentPlan;
import com.cloud.exception.ConcurrentOperationException;
import com.cloud.exception.InsufficientAddressCapacityException;
import com.cloud.exception.InsufficientVirtualNetworkCapcityException;
import com.cloud.network.Network;
import com.cloud.network.Network.State;
import com.cloud.network.NetworkManager;
import com.cloud.network.NetworkProfile;
import com.cloud.network.Networks.AddressFormat;
import com.cloud.network.Networks.BroadcastDomainType;
import com.cloud.network.Networks.IsolationType;
import com.cloud.network.Networks.Mode;
import com.cloud.network.Networks.TrafficType;
import com.cloud.network.addr.PublicIp;
import com.cloud.network.dao.IPAddressDao;
import com.cloud.network.dao.IPAddressVO;
import com.cloud.network.dao.NetworkVO;
import com.cloud.offering.NetworkOffering;
import com.cloud.user.Account;
import com.cloud.utils.component.AdapterBase;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.Transaction;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.vm.Nic.ReservationStrategy;
import com.cloud.vm.NicProfile;
import com.cloud.vm.ReservationContext;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachineProfile;

@Local(value = { NetworkGuru.class })
public class PublicNetworkGuru extends AdapterBase implements NetworkGuru {
    private static final Logger s_logger = Logger.getLogger(PublicNetworkGuru.class);

    @Inject
    DataCenterDao _dcDao;
    @Inject
    VlanDao _vlanDao;
    @Inject
    NetworkManager _networkMgr;
    @Inject
    IPAddressDao _ipAddressDao;

    private static final TrafficType[] _trafficTypes = {TrafficType.Public};

    @Override
    public boolean isMyTrafficType(TrafficType type) {
        for (TrafficType t : _trafficTypes) {
            if (t == type) {
                return true;
            }
        }
        return false;
    }

    @Override
    public TrafficType[] getSupportedTrafficType() {
        return _trafficTypes;
    }

    protected boolean canHandle(NetworkOffering offering) {
        return isMyTrafficType(offering.getTrafficType()) && offering.isSystemOnly();
    }

    @Override
    public Network design(NetworkOffering offering, DeploymentPlan plan, Network network, Account owner) {
        if (!canHandle(offering)) {
            return null;
        }

        if (offering.getTrafficType() == TrafficType.Public) {
            NetworkVO ntwk = new NetworkVO(offering.getTrafficType(), Mode.Static, BroadcastDomainType.Vlan, offering.getId(), State.Setup, plan.getDataCenterId(), plan.getPhysicalNetworkId());
            return ntwk;
        } else {
            return null;
        }
    }

    protected PublicNetworkGuru() {
        super();
    }

    protected void getIp(NicProfile nic, DataCenter dc, VirtualMachineProfile<? extends VirtualMachine> vm, Network network) throws InsufficientVirtualNetworkCapcityException,
    InsufficientAddressCapacityException, ConcurrentOperationException {
        if (nic.getIp4Address() == null) {
            PublicIp ip = _networkMgr.assignPublicIpAddress(dc.getId(), null, vm.getOwner(), VlanType.VirtualNetwork, null, null, false);
            nic.setIp4Address(ip.getAddress().toString());
            nic.setGateway(ip.getGateway());
            nic.setNetmask(ip.getNetmask());
            nic.setIsolationUri(IsolationType.Vlan.toUri(ip.getVlanTag()));
            nic.setBroadcastUri(IsolationType.Vlan.toUri(ip.getVlanTag()));
            nic.setBroadcastType(BroadcastDomainType.Vlan);
            nic.setFormat(AddressFormat.Ip4);
            nic.setReservationId(String.valueOf(ip.getVlanTag()));
            nic.setMacAddress(ip.getMacAddress());
        }

        nic.setDns1(dc.getDns1());
        nic.setDns2(dc.getDns2());
    }

    @Override
    public void updateNicProfile(NicProfile profile, Network network) {
        DataCenter dc = _dcDao.findById(network.getDataCenterId());
        if (profile != null) {
            profile.setDns1(dc.getDns1());
            profile.setDns2(dc.getDns2());
        }
    }

    @Override
    public NicProfile allocate(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm) 
            throws InsufficientVirtualNetworkCapcityException,
    InsufficientAddressCapacityException, ConcurrentOperationException {

        DataCenter dc = _dcDao.findById(network.getDataCenterId());       

        if (nic != null && nic.getRequestedIpv4() != null) {
            throw new CloudRuntimeException("Does not support custom ip allocation at this time: " + nic);
        }

        if (nic == null) {
            nic = new NicProfile(ReservationStrategy.Create, null, null, null, null);
        }

        getIp(nic, dc, vm, network);

        if (nic.getIp4Address() == null) {
            nic.setStrategy(ReservationStrategy.Start);
        } else if (vm.getVirtualMachine().getType() == VirtualMachine.Type.DomainRouter){
            nic.setStrategy(ReservationStrategy.Managed);
        } else {
            nic.setStrategy(ReservationStrategy.Create);
        }

        return nic;
    }

    @Override
    public void reserve(NicProfile nic, Network network, VirtualMachineProfile<? extends VirtualMachine> vm, DeployDestination dest, ReservationContext context)
            throws InsufficientVirtualNetworkCapcityException, InsufficientAddressCapacityException, ConcurrentOperationException {
        if (nic.getIp4Address() == null) {
            getIp(nic, dest.getDataCenter(), vm, network);
        }
    }

    @Override
    public boolean release(NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm, String reservationId) {
        return true;
    }

    @Override
    public Network implement(Network network, NetworkOffering offering, DeployDestination destination, ReservationContext context)
            throws InsufficientVirtualNetworkCapcityException {
        return network;
    }

    @Override @DB
    public void deallocate(Network network, NicProfile nic, VirtualMachineProfile<? extends VirtualMachine> vm) {
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("public network deallocate network: networkId: " + nic.getNetworkId() + ", ip: " + nic.getIp4Address());
        }

        IPAddressVO ip = _ipAddressDao.findByIpAndSourceNetworkId(nic.getNetworkId(), nic.getIp4Address());
        if (ip != null && nic.getReservationStrategy() != ReservationStrategy.Managed) {

            Transaction txn = Transaction.currentTxn();
            txn.start();

            _networkMgr.markIpAsUnavailable(ip.getId());
            _ipAddressDao.unassignIpAddress(ip.getId());

            txn.commit();
        }
        nic.deallocate();
        
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Deallocated nic: " + nic);
        }
    }

    @Override
    public void shutdown(NetworkProfile network, NetworkOffering offering) {
    }

    @Override
    public boolean trash(Network network, NetworkOffering offering, Account owner) {
        return true;
    }

    @Override
    public void updateNetworkProfile(NetworkProfile networkProfile) {
        DataCenter dc = _dcDao.findById(networkProfile.getDataCenterId());
        networkProfile.setDns1(dc.getDns1());
        networkProfile.setDns2(dc.getDns2());
    }

}
