/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later version.
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package com.cloud.consoleproxy;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.ejb.Local;
import javax.naming.ConfigurationException;

import org.apache.log4j.Logger;

import com.cloud.agent.AgentManager;
import com.cloud.agent.api.AgentControlAnswer;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.ConsoleAccessAuthenticationAnswer;
import com.cloud.agent.api.ConsoleAccessAuthenticationCommand;
import com.cloud.agent.api.ConsoleProxyLoadReportCommand;
import com.cloud.agent.api.RebootCommand;
import com.cloud.agent.api.StartupCommand;
import com.cloud.agent.api.StartupProxyCommand;
import com.cloud.agent.api.StopAnswer;
import com.cloud.agent.api.check.CheckSshAnswer;
import com.cloud.agent.api.check.CheckSshCommand;
import com.cloud.agent.api.proxy.ConsoleProxyLoadAnswer;
import com.cloud.agent.api.proxy.StartConsoleProxyAgentHttpHandlerCommand;
import com.cloud.agent.manager.Commands;
import com.cloud.api.ServerApiException;
import com.cloud.api.commands.DestroyConsoleProxyCmd;
import com.cloud.certificate.dao.CertificateDao;
import com.cloud.cluster.ClusterManager;
import com.cloud.cluster.StackMaid;
import com.cloud.configuration.Config;
import com.cloud.configuration.dao.ConfigurationDao;
import com.cloud.dc.DataCenter;
import com.cloud.dc.DataCenter.NetworkType;
import com.cloud.dc.DataCenterVO;
import com.cloud.dc.HostPodVO;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.dc.dao.HostPodDao;
import com.cloud.deploy.DataCenterDeployment;
import com.cloud.deploy.DeployDestination;
import com.cloud.exception.AgentUnavailableException;
import com.cloud.exception.ConcurrentOperationException;
import com.cloud.exception.InsufficientCapacityException;
import com.cloud.exception.InvalidParameterValueException;
import com.cloud.exception.OperationTimedoutException;
import com.cloud.exception.ResourceUnavailableException;
import com.cloud.exception.StorageUnavailableException;
import com.cloud.host.Host.Type;
import com.cloud.host.HostVO;
import com.cloud.host.dao.HostDao;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.info.ConsoleProxyConnectionInfo;
import com.cloud.info.ConsoleProxyInfo;
import com.cloud.info.ConsoleProxyLoadInfo;
import com.cloud.info.ConsoleProxyStatus;
import com.cloud.info.RunningHostCountInfo;
import com.cloud.info.RunningHostInfoAgregator;
import com.cloud.info.RunningHostInfoAgregator.ZoneHostInfo;
import com.cloud.keystore.KeystoreDao;
import com.cloud.keystore.KeystoreManager;
import com.cloud.keystore.KeystoreVO;
import com.cloud.network.NetworkManager;
import com.cloud.network.NetworkVO;
import com.cloud.network.Networks.TrafficType;
import com.cloud.offerings.NetworkOfferingVO;
import com.cloud.offerings.dao.NetworkOfferingDao;
import com.cloud.service.ServiceOfferingVO;
import com.cloud.service.dao.ServiceOfferingDao;
import com.cloud.servlet.ConsoleProxyServlet;
import com.cloud.storage.StorageManager;
import com.cloud.storage.VMTemplateHostVO;
import com.cloud.storage.VMTemplateStorageResourceAssoc.Status;
import com.cloud.storage.VMTemplateVO;
import com.cloud.storage.dao.VMTemplateDao;
import com.cloud.storage.dao.VMTemplateHostDao;
import com.cloud.user.Account;
import com.cloud.user.AccountManager;
import com.cloud.user.User;
import com.cloud.utils.DateUtil;
import com.cloud.utils.NumbersUtil;
import com.cloud.utils.Pair;
import com.cloud.utils.component.Adapters;
import com.cloud.utils.component.ComponentLocator;
import com.cloud.utils.component.Inject;
import com.cloud.utils.component.Manager;
import com.cloud.utils.concurrency.NamedThreadFactory;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.GlobalLock;
import com.cloud.utils.db.Transaction;
import com.cloud.utils.events.SubscriptionMgr;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.net.NetUtils;
import com.cloud.vm.ConsoleProxyVO;
import com.cloud.vm.NicProfile;
import com.cloud.vm.ReservationContext;
import com.cloud.vm.SystemVmLoadScanHandler;
import com.cloud.vm.SystemVmLoadScanner;
import com.cloud.vm.SystemVmLoadScanner.AfterScanAction;
import com.cloud.vm.VMInstanceVO;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachine.State;
import com.cloud.vm.VirtualMachineGuru;
import com.cloud.vm.VirtualMachineManager;
import com.cloud.vm.VirtualMachineName;
import com.cloud.vm.VirtualMachineProfile;
import com.cloud.vm.dao.ConsoleProxyDao;
import com.cloud.vm.dao.VMInstanceDao;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

//
// Possible console proxy state transition cases
//		Stopped --> Starting -> Running
//		HA -> Stopped -> Starting -> Running
//		Migrating -> Running	(if previous state is Running before it enters into Migrating state
//		Migrating -> Stopped	(if previous state is not Running before it enters into Migrating state)
//		Running -> HA			(if agent lost connection)
//		Stopped -> Destroyed
//
// Starting, HA, Migrating, Running state are all counted as "Open" for available capacity calculation
// because sooner or later, it will be driven into Running state
//
@Local(value = { ConsoleProxyManager.class, ConsoleProxyService.class })
public class ConsoleProxyManagerImpl implements ConsoleProxyManager, ConsoleProxyService, Manager, AgentHook, VirtualMachineGuru<ConsoleProxyVO>, SystemVmLoadScanHandler<Long> {
    private static final Logger s_logger = Logger.getLogger(ConsoleProxyManagerImpl.class);

    private static final int DEFAULT_CAPACITY_SCAN_INTERVAL = 30000; // 30 seconds
    private static final int ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_SYNC = 180; // 3 minutes

    private static final int API_WAIT_TIMEOUT = 5000; // 5 seconds (in milliseconds)
    private static final int STARTUP_DELAY = 60000; // 60 seconds

    private int _consoleProxyPort = ConsoleProxyManager.DEFAULT_PROXY_VNC_PORT;

    private String _mgmt_host;
    private int _mgmt_port = 8250;

    private String _name;
    private Adapters<ConsoleProxyAllocator> _consoleProxyAllocators;

    @Inject
    private ConsoleProxyDao _consoleProxyDao;
    @Inject
    private DataCenterDao _dcDao;
    @Inject
    private VMTemplateDao _templateDao;
    @Inject
    private HostPodDao _podDao;
    @Inject
    private HostDao _hostDao;
    @Inject
    private ConfigurationDao _configDao;
    @Inject
    private CertificateDao _certDao;
    @Inject
    private VMInstanceDao _instanceDao;
    @Inject
    private VMTemplateHostDao _vmTemplateHostDao;
    @Inject
    private AgentManager _agentMgr;
    @Inject
    private StorageManager _storageMgr;
    @Inject
    NetworkManager _networkMgr;
    @Inject
    AccountManager _accountMgr;
    @Inject
    ServiceOfferingDao _offeringDao;
    @Inject
    NetworkOfferingDao _networkOfferingDao;

    private ConsoleProxyListener _listener;

    private ServiceOfferingVO _serviceOffering;

    NetworkOfferingVO _publicNetworkOffering;
    NetworkOfferingVO _managementNetworkOffering;
    NetworkOfferingVO _linkLocalNetworkOffering;

    @Inject
    private VirtualMachineManager _itMgr;

    private final ExecutorService _requestHandlerScheduler = Executors.newCachedThreadPool(new NamedThreadFactory("Request-handler"));

    private long _capacityScanInterval = DEFAULT_CAPACITY_SCAN_INTERVAL;
    private int _capacityPerProxy = ConsoleProxyManager.DEFAULT_PROXY_CAPACITY;
    private int _standbyCapacity = ConsoleProxyManager.DEFAULT_STANDBY_CAPACITY;

    private int _proxyRamSize;
    private int _proxyCpuMHz;
    private boolean _use_lvm;
    private boolean _use_storage_vm;
    private boolean _disable_rp_filter = false;
    private String _instance;

    private int _proxySessionTimeoutValue = DEFAULT_PROXY_SESSION_TIMEOUT;
    private boolean _sslEnabled = false;

    // global load picture at zone basis
    private SystemVmLoadScanner<Long> _loadScanner;
    private Map<Long, ZoneHostInfo> _zoneHostInfoMap; // map <zone id, info about running host in zone>
    private Map<Long, ConsoleProxyLoadInfo> _zoneProxyCountMap; // map <zone id, info about proxy VMs count in zone>
    private Map<Long, ConsoleProxyLoadInfo> _zoneVmCountMap; // map <zone id, info about running VMs count in zone>

    private final GlobalLock _allocProxyLock = GlobalLock.getInternLock(getAllocProxyLockName());

    private final String keyContent = "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBALV5vGlkiWwoZX4hTRplPXP8qtST\n"
            + "hwZhko8noeY5vf8ECwmd+vrCTw/JvnOtkx/8oYNbg/SeUt1EfOsk6gqJdBblGFBZRMcUJlIpqE9z\n" + "uv68U9G8Gfi/qvRSY336hibw0J5bZ4vn1QqmyHDB+Czea9AjFUV7AEVG15+vED7why+/AgMBAAEC\n"
            + "gYBmFBPnNKYYMKDmUdUNA+WNWJK/ADzzWe8WlzR6TACTcbLDthl289WFC/YVG42mcHRpbxDKiEQU\n" + "MnIR0rHTO34Qb/2HcuyweStU2gqR6omxBvMnFpJr90nD1HcOMJzeLHsphau0/EmKKey+gk4PyieD\n"
            + "KqTM7LTjjHv8xPM4n+WAAQJBAOMNCeFKlJ4kMokWhU74B5/w/NGyT1BHUN0VmilHSiJC8JqS4BiI\n" + "ZpAeET3VmilO6QTGh2XVhEDGteu3uZR6ipUCQQDMnRzMgQ/50LFeIQo4IBtwlEouczMlPQF4c21R\n"
            + "1d720moxILVPT0NJZTQUDDmmgbL+B7CgtcCR2NlP5sKPZVADAkEAh4Xq1cy8dMBKYcVNgNtPQcqI\n" + "PWpfKR3ISI5yXB0vRNAL6Vet5zbTcUZhKDVtNSbis3UEsGYH8NorEC2z2cpjGQJANhJi9Ow6c5Mh\n"
            + "/DURBUn+1l5pyCKrZnDbvaALSLATLvjmFTuGjoHszy2OeKnOZmEqExWnKKE/VYuPyhy6V7i3TwJA\n" + "f8skDgtPK0OsBCa6IljPaHoWBjPc4kFkSTSS1d56hUcWSikTmiuKdLyBb85AADSZYsvHWrte4opN\n" + "dhNukMJuRA==\n";

    private final String certContent = "-----BEGIN CERTIFICATE-----\n" + "MIIE3jCCA8agAwIBAgIFAqv56tIwDQYJKoZIhvcNAQEFBQAwgcoxCzAJBgNVBAYT\n"
            + "AlVTMRAwDgYDVQQIEwdBcml6b25hMRMwEQYDVQQHEwpTY290dHNkYWxlMRowGAYD\n" + "VQQKExFHb0RhZGR5LmNvbSwgSW5jLjEzMDEGA1UECxMqaHR0cDovL2NlcnRpZmlj\n"
            + "YXRlcy5nb2RhZGR5LmNvbS9yZXBvc2l0b3J5MTAwLgYDVQQDEydHbyBEYWRkeSBT\n" + "ZWN1cmUgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkxETAPBgNVBAUTCDA3OTY5Mjg3\n"
            + "MB4XDTA5MDIxMTA0NTc1NloXDTEyMDIwNzA1MTEyM1owWTEZMBcGA1UECgwQKi5y\n" + "ZWFsaG9zdGlwLmNvbTEhMB8GA1UECwwYRG9tYWluIENvbnRyb2wgVmFsaWRhdGVk\n"
            + "MRkwFwYDVQQDDBAqLnJlYWxob3N0aXAuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GN\n" + "ADCBiQKBgQC1ebxpZIlsKGV+IU0aZT1z/KrUk4cGYZKPJ6HmOb3/BAsJnfr6wk8P\n"
            + "yb5zrZMf/KGDW4P0nlLdRHzrJOoKiXQW5RhQWUTHFCZSKahPc7r+vFPRvBn4v6r0\n" + "UmN9+oYm8NCeW2eL59UKpshwwfgs3mvQIxVFewBFRtefrxA+8IcvvwIDAQABo4IB\n"
            + "vTCCAbkwDwYDVR0TAQH/BAUwAwEBADAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYB\n" + "BQUHAwIwDgYDVR0PAQH/BAQDAgWgMDIGA1UdHwQrMCkwJ6AloCOGIWh0dHA6Ly9j\n"
            + "cmwuZ29kYWRkeS5jb20vZ2RzMS0yLmNybDBTBgNVHSAETDBKMEgGC2CGSAGG/W0B\n" + "BxcBMDkwNwYIKwYBBQUHAgEWK2h0dHA6Ly9jZXJ0aWZpY2F0ZXMuZ29kYWRkeS5j\n"
            + "b20vcmVwb3NpdG9yeS8wgYAGCCsGAQUFBwEBBHQwcjAkBggrBgEFBQcwAYYYaHR0\n" + "cDovL29jc3AuZ29kYWRkeS5jb20vMEoGCCsGAQUFBzAChj5odHRwOi8vY2VydGlm\n"
            + "aWNhdGVzLmdvZGFkZHkuY29tL3JlcG9zaXRvcnkvZ2RfaW50ZXJtZWRpYXRlLmNy\n" + "dDAfBgNVHSMEGDAWgBT9rGEyk2xF1uLuhV+auud2mWjM5zArBgNVHREEJDAighAq\n"
            + "LnJlYWxob3N0aXAuY29tgg5yZWFsaG9zdGlwLmNvbTAdBgNVHQ4EFgQUHxwmdK5w\n" + "9/YVeZ/3fHyi6nQfzoYwDQYJKoZIhvcNAQEFBQADggEBABv/XinvId6oWXJtmku+\n"
            + "7m90JhSVH0ycoIGjgdaIkcExQGP08MCilbUsPcbhLheSFdgn/cR4e1MP083lacoj\n" + "OGauY7b8f/cuquGkT49Ns14awPlEzRjjycQEjjLxFEuL5CFWa2t2gKRE1dSfhDQ+\n"
            + "fJ6GBCs1XgZLuhkKS8fPf+YmG2ZjHzYDjYoSx7paDXgEm+kbYIZdCK51lA0BUAjP\n" + "9ZMGhsu/PpAbh5U/DtcIqxY0xeqD4TeGsBzXg6uLhv+jKHDtXg5fYPe+z0n5DCEL\n"
            + "k0fLF4+i/pt9hVCz0QrZ28RUhXf825+EOL0Gw+Uzt+7RV2cCaJrlu4cDrDom2FRy\n" + "E8I=\n" + "-----END CERTIFICATE-----\n";

    @Inject
    private KeystoreDao _ksDao;
    @Inject
    private KeystoreManager _ksMgr;
    private final Random _random = new Random(System.currentTimeMillis());

    @Override
    public ConsoleProxyInfo assignProxy(final long dataCenterId, final long vmId) {

        final Pair<ConsoleProxyManagerImpl, ConsoleProxyVO> result = new Pair<ConsoleProxyManagerImpl, ConsoleProxyVO>(this, null);

        _requestHandlerScheduler.execute(new Runnable() {
            @Override
            public void run() {
                Transaction txn = Transaction.open(Transaction.CLOUD_DB);
                try {
                    ConsoleProxyVO proxy = doAssignProxy(dataCenterId, vmId);
                    synchronized (result) {
                        result.second(proxy);
                        result.notifyAll();
                    }
                } catch (Throwable e) {
                    s_logger.warn("Unexpected exception " + e.getMessage(), e);
                } finally {
                    StackMaid.current().exitCleanup();
                    txn.close();
                }
            }
        });

        synchronized (result) {
            try {
                result.wait(API_WAIT_TIMEOUT);
            } catch (InterruptedException e) {
                s_logger.info("Waiting for console proxy assignment is interrupted");
            }
        }

        ConsoleProxyVO proxy = result.second();
        if (proxy == null) {
            return null;
        }

        if (proxy.getPublicIpAddress() == null) {
            s_logger.warn("Assigned console proxy does not have a valid public IP address");
            return null;
        }

        KeystoreVO ksVo = _ksDao.findByName(ConsoleProxyManager.CERTIFICATE_NAME);
        assert (ksVo != null);

        return new ConsoleProxyInfo(proxy.isSslEnabled(), proxy.getPublicIpAddress(), _consoleProxyPort, proxy.getPort(), ksVo.getDomainSuffix());
    }

    public ConsoleProxyVO doAssignProxy(long dataCenterId, long vmId) {
        ConsoleProxyVO proxy = null;
        VMInstanceVO vm = _instanceDao.findById(vmId);
        if (vm == null) {
            s_logger.warn("VM " + vmId + " no longer exists, return a null proxy for vm:" + vmId);
            return null;
        }

        Boolean[] proxyFromStoppedPool = new Boolean[1];
        if (_allocProxyLock.lock(ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_SYNC)) {
            try {
                proxy = getOrAllocProxyResource(dataCenterId, vmId, proxyFromStoppedPool);
            } finally {
                _allocProxyLock.unlock();
            }
        } else {
            s_logger.error("Unable to acquire synchronization lock to get/allocate proxy resource for vm :" + vmId + ". Previous console proxy allocation is taking too long");
        }

        if (proxy == null) {
            s_logger.warn("Unable to find or allocate console proxy resource");
            return null;
        }

        long proxyVmId = proxy.getId();
        proxy = startProxy(proxyVmId);
        if (proxy == null) {
            return null;
        } else {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Console proxy " + proxy.getHostName() + " is started");
            }

            // if it is a new assignment or a changed assignment,
            // update the
            // record
            if (vm.getProxyId() == null || vm.getProxyId().longValue() != proxy.getId()) {
                _instanceDao.updateProxyId(vmId, proxy.getId(), DateUtil.currentGMTTime());
            }

            proxy.setSslEnabled(_sslEnabled);
            if (_sslEnabled) {
                proxy.setPort(443);
            } else {
                proxy.setPort(80);
            }

            return proxy;
        }
    }

    private ConsoleProxyVO getOrAllocProxyResource(long dataCenterId, long vmId, Boolean[] proxyFromStoppedPool) {
        ConsoleProxyVO proxy = null;
        VMInstanceVO vm = this._instanceDao.findById(vmId);

        if (vm != null && vm.getState() != State.Running) {
            if (s_logger.isInfoEnabled()) {
                s_logger.info("Detected that vm : " + vmId + " is not currently at running state, we will fail the proxy assignment for it");
            }
            return null;
        }

        if (vm != null && vm.getProxyId() != null) {
            proxy = _consoleProxyDao.findById(vm.getProxyId());

            if (proxy != null) {
                if (!isInAssignableState(proxy)) {
                    if (s_logger.isInfoEnabled()) {
                        s_logger.info("A previous assigned proxy is not assignable now, reassign console proxy for user vm : " + vmId);
                    }
                    proxy = null;
                } else {
                    if (_consoleProxyDao.getProxyActiveLoad(proxy.getId()) < _capacityPerProxy || hasPreviousSession(proxy, vm)) {
                        if (s_logger.isTraceEnabled()) {
                            s_logger.trace("Assign previous allocated console proxy for user vm : " + vmId);
                        }

                        if (proxy.getActiveSession() >= _capacityPerProxy) {
                            s_logger.warn("Assign overloaded proxy to user VM as previous session exists, user vm : " + vmId);
                        }
                    } else {
                        proxy = null;
                    }
                }
            }
        }

        if (proxy == null) {
            proxy = assignProxyFromRunningPool(dataCenterId);
        }

        if (proxy == null) {
            if (s_logger.isInfoEnabled()) {
                s_logger.info("No running console proxy is available, check to see if we can bring up a stopped one for data center : " + dataCenterId);
            }

            proxy = assignProxyFromStoppedPool(dataCenterId);
            if (proxy == null) {
                if (s_logger.isInfoEnabled()) {
                    s_logger.info("No stopped console proxy is available, need to allocate a new console proxy for data center : " + dataCenterId);
                }

                try {
                    proxy = startNew(dataCenterId);
                } catch (ConcurrentOperationException e) {
                    s_logger.info("Concurrent operation caught " + e);
                    return null;
                }
            } else {
                if (s_logger.isInfoEnabled()) {
                    s_logger.info("Found a stopped console proxy, bring it up to running pool. proxy vm id : " + proxy.getId() + ", data center : " + dataCenterId);
                }

                proxyFromStoppedPool[0] = new Boolean(true);
            }
        }

        return proxy;
    }

    private static boolean isInAssignableState(ConsoleProxyVO proxy) {
        // console proxies that are in states of being able to serve user VM
        State state = proxy.getState();
        if (state == State.Running || state == State.Starting || state == State.Migrating) {
            return true;
        }

        return false;
    }

    private boolean hasPreviousSession(ConsoleProxyVO proxy, VMInstanceVO vm) {

        ConsoleProxyStatus status = null;
        try {
            GsonBuilder gb = new GsonBuilder();
            gb.setVersion(1.3);
            Gson gson = gb.create();

            byte[] details = proxy.getSessionDetails();
            status = gson.fromJson(details != null ? new String(details, Charset.forName("US-ASCII")) : null, ConsoleProxyStatus.class);
        } catch (Throwable e) {
            s_logger.warn("Unable to parse proxy session details : " + proxy.getSessionDetails());
        }

        if (status != null && status.getConnections() != null) {
            ConsoleProxyConnectionInfo[] connections = status.getConnections();
            for (int i = 0; i < connections.length; i++) {
                long taggedVmId = 0;
                if (connections[i].tag != null) {
                    try {
                        taggedVmId = Long.parseLong(connections[i].tag);
                    } catch (NumberFormatException e) {
                        s_logger.warn("Unable to parse console proxy connection info passed through tag: " + connections[i].tag, e);
                    }
                }
                if (taggedVmId == vm.getId()) {
                    return true;
                }
            }

            //
            // even if we are not in the list, it may because we haven't
            // received load-update yet
            // wait until session time
            //
            if (DateUtil.currentGMTTime().getTime() - vm.getProxyAssignTime().getTime() < _proxySessionTimeoutValue) {
                return true;
            }

            return false;
        } else {
            s_logger.error("No proxy load info on an overloaded proxy ?");
            return false;
        }
    }

    @Override
    public ConsoleProxyVO startProxy(long proxyVmId) {
        try {
            ConsoleProxyVO proxy = _consoleProxyDao.findById(proxyVmId);
            Account systemAcct = _accountMgr.getSystemAccount();
            User systemUser = _accountMgr.getSystemUser();
            if (proxy.getState() == VirtualMachine.State.Running) {
                return proxy;
            }

            String restart = _configDao.getValue(Config.ConsoleProxyRestart.key());
            if (restart != null && restart.equalsIgnoreCase("false")) {
                return null;
            }

            if (proxy.getState() == VirtualMachine.State.Stopped) {
                return _itMgr.start(proxy, null, systemUser, systemAcct);
            }

            // For VMs that are in Stopping, Starting, Migrating state, let client to wait by returning null
            // as sooner or later, Starting/Migrating state will be transited to Running and Stopping will be transited to
            // Stopped to allow
            // Starting of it
            s_logger.warn("Console proxy is not in correct state to be started: " + proxy.getState());
            return null;
        } catch (StorageUnavailableException e) {
            s_logger.warn("Exception while trying to start console proxy", e);
            return null;
        } catch (InsufficientCapacityException e) {
            s_logger.warn("Exception while trying to start console proxy", e);
            return null;
        } catch (ResourceUnavailableException e) {
            s_logger.warn("Exception while trying to start console proxy", e);
            return null;
        } catch (CloudRuntimeException e) {
            s_logger.warn("Runtime Exception while trying to start console proxy", e);
            return null;
        }
    }

    public ConsoleProxyVO assignProxyFromRunningPool(long dataCenterId) {

        if (s_logger.isTraceEnabled()) {
            s_logger.trace("Assign console proxy from running pool for request from data center : " + dataCenterId);
        }

        ConsoleProxyAllocator allocator = getCurrentAllocator();
        assert (allocator != null);
        List<ConsoleProxyVO> runningList = _consoleProxyDao.getProxyListInStates(dataCenterId, State.Running);
        if (runningList != null && runningList.size() > 0) {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Running proxy pool size : " + runningList.size());
                for (ConsoleProxyVO proxy : runningList) {
                    s_logger.trace("Running proxy instance : " + proxy.getHostName());
                }
            }

            List<Pair<Long, Integer>> l = _consoleProxyDao.getProxyLoadMatrix();
            Map<Long, Integer> loadInfo = new HashMap<Long, Integer>();
            if (l != null) {
                for (Pair<Long, Integer> p : l) {
                    loadInfo.put(p.first(), p.second());

                    if (s_logger.isTraceEnabled()) {
                        s_logger.trace("Running proxy instance allocation load { proxy id : " + p.first() + ", load : " + p.second() + "}");
                    }
                }
            }
            return allocator.allocProxy(runningList, loadInfo, dataCenterId);
        } else {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Empty running proxy pool for now in data center : " + dataCenterId);
            }
        }
        return null;
    }

    public ConsoleProxyVO assignProxyFromStoppedPool(long dataCenterId) {

        // practically treat all console proxy VM that is not in Running state but can be entering into Running state as
        // candidates
        // this is to prevent launching unneccessary console proxy VMs because of temporarily unavailable state
        List<ConsoleProxyVO> l = _consoleProxyDao.getProxyListInStates(dataCenterId, State.Starting, State.Stopped, State.Migrating, State.Stopping);
        if (l != null && l.size() > 0) {
            return l.get(0);
        }

        return null;
    }

    public ConsoleProxyVO startNew(long dataCenterId) throws ConcurrentOperationException {

        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Assign console proxy from a newly started instance for request from data center : " + dataCenterId);
        }

        if (!allowToLaunchNew(dataCenterId)) {
            s_logger.warn("The number of launched console proxy on zone " + dataCenterId + " has reached to limit");
            return null;
        }
        HypervisorType currentHyp = currentHypervisorType(dataCenterId);

        Map<String, Object> context = createProxyInstance(dataCenterId, currentHyp);

        long proxyVmId = (Long) context.get("proxyVmId");
        if (proxyVmId == 0) {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Creating proxy instance failed, data center id : " + dataCenterId);
            }
            return null;
        }

        ConsoleProxyVO proxy = _consoleProxyDao.findById(proxyVmId);
        if (proxy != null) {
            SubscriptionMgr.getInstance().notifySubscribers(ConsoleProxyManager.ALERT_SUBJECT, this,
                    new ConsoleProxyAlertEventArgs(ConsoleProxyAlertEventArgs.PROXY_CREATED, dataCenterId, proxy.getId(), proxy, null));
            return proxy;
        } else {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Unable to allocate console proxy storage, remove the console proxy record from DB, proxy id: " + proxyVmId);
            }

            SubscriptionMgr.getInstance().notifySubscribers(ConsoleProxyManager.ALERT_SUBJECT, this,
                    new ConsoleProxyAlertEventArgs(ConsoleProxyAlertEventArgs.PROXY_CREATE_FAILURE, dataCenterId, proxyVmId, null, "Unable to allocate storage"));
        }
        return null;
    }

    protected Map<String, Object> createProxyInstance(long dataCenterId, HypervisorType desiredHyp) throws ConcurrentOperationException {

        long id = _consoleProxyDao.getNextInSequence(Long.class, "id");
        String name = VirtualMachineName.getConsoleProxyName(id, _instance);
        DataCenterVO dc = _dcDao.findById(dataCenterId);
        Account systemAcct = _accountMgr.getSystemAccount();

        DataCenterDeployment plan = new DataCenterDeployment(dataCenterId);
        List<NetworkOfferingVO> defaultOffering = _networkMgr.getSystemAccountNetworkOfferings(NetworkOfferingVO.SystemPublicNetwork);

        if (dc.getNetworkType() == NetworkType.Basic || dc.isSecurityGroupEnabled()) {
            defaultOffering = _networkMgr.getSystemAccountNetworkOfferings(NetworkOfferingVO.SystemGuestNetwork);
        }

        List<NetworkOfferingVO> offerings = _networkMgr.getSystemAccountNetworkOfferings(NetworkOfferingVO.SystemControlNetwork, NetworkOfferingVO.SystemManagementNetwork);
        List<Pair<NetworkVO, NicProfile>> networks = new ArrayList<Pair<NetworkVO, NicProfile>>(offerings.size() + 1);
        NicProfile defaultNic = new NicProfile();
        defaultNic.setDefaultNic(true);
        defaultNic.setDeviceId(2);
        networks.add(new Pair<NetworkVO, NicProfile>(_networkMgr.setupNetwork(systemAcct, defaultOffering.get(0), plan, null, null, false, false).get(0), defaultNic));
        for (NetworkOfferingVO offering : offerings) {
            networks.add(new Pair<NetworkVO, NicProfile>(_networkMgr.setupNetwork(systemAcct, offering, plan, null, null, false, false).get(0), null));
        }

        VMTemplateVO template = _templateDao.findSystemVMTemplate(dataCenterId, desiredHyp);
        if (template == null) {
            s_logger.debug("Can't find a template to start");
            throw new CloudRuntimeException("Insufficient capacity exception");
        }

        ConsoleProxyVO proxy = new ConsoleProxyVO(id, _serviceOffering.getId(), name, template.getId(), template.getHypervisorType(), template.getGuestOSId(), dataCenterId, systemAcct.getDomainId(),
                systemAcct.getId(), 0, _serviceOffering.getOfferHA());
        try {
            proxy = _itMgr.allocate(proxy, template, _serviceOffering, networks, plan, null, systemAcct);
        } catch (InsufficientCapacityException e) {
            s_logger.warn("InsufficientCapacity", e);
            throw new CloudRuntimeException("Insufficient capacity exception", e);
        }

        Map<String, Object> context = new HashMap<String, Object>();
        context.put("dc", dc);
        HostPodVO pod = _podDao.findById(proxy.getPodId());
        context.put("pod", pod);
        context.put("proxyVmId", proxy.getId());

        return context;
    }

    private ConsoleProxyAllocator getCurrentAllocator() {
        // for now, only one adapter is supported
        Enumeration<ConsoleProxyAllocator> it = _consoleProxyAllocators.enumeration();
        if (it.hasMoreElements()) {
            return it.nextElement();
        }

        return null;
    }

    public void onLoadAnswer(ConsoleProxyLoadAnswer answer) {
        if (answer.getDetails() == null) {
            return;
        }

        ConsoleProxyStatus status = null;
        try {
            GsonBuilder gb = new GsonBuilder();
            gb.setVersion(1.3);
            Gson gson = gb.create();
            status = gson.fromJson(answer.getDetails(), ConsoleProxyStatus.class);
        } catch (Throwable e) {
            s_logger.warn("Unable to parse load info from proxy, proxy vm id : " + answer.getProxyVmId() + ", info : " + answer.getDetails());
        }

        if (status != null) {
            int count = 0;
            if (status.getConnections() != null) {
                count = status.getConnections().length;
            }

            byte[] details = null;
            if (answer.getDetails() != null) {
                details = answer.getDetails().getBytes(Charset.forName("US-ASCII"));
            }
            _consoleProxyDao.update(answer.getProxyVmId(), count, DateUtil.currentGMTTime(), details);
        } else {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Unable to get console proxy load info, id : " + answer.getProxyVmId());
            }

            _consoleProxyDao.update(answer.getProxyVmId(), 0, DateUtil.currentGMTTime(), null);
            // TODO : something is wrong with the VM, restart it?
        }
    }

    @Override
    public void onLoadReport(ConsoleProxyLoadReportCommand cmd) {
        if (cmd.getLoadInfo() == null) {
            return;
        }

        ConsoleProxyStatus status = null;
        try {
            GsonBuilder gb = new GsonBuilder();
            gb.setVersion(1.3);
            Gson gson = gb.create();
            status = gson.fromJson(cmd.getLoadInfo(), ConsoleProxyStatus.class);
        } catch (Throwable e) {
            s_logger.warn("Unable to parse load info from proxy, proxy vm id : " + cmd.getProxyVmId() + ", info : " + cmd.getLoadInfo());
        }

        if (status != null) {
            int count = 0;
            if (status.getConnections() != null) {
                count = status.getConnections().length;
            }

            byte[] details = null;
            if (cmd.getLoadInfo() != null) {
                details = cmd.getLoadInfo().getBytes(Charset.forName("US-ASCII"));
            }
            _consoleProxyDao.update(cmd.getProxyVmId(), count, DateUtil.currentGMTTime(), details);
        } else {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Unable to get console proxy load info, id : " + cmd.getProxyVmId());
            }

            _consoleProxyDao.update(cmd.getProxyVmId(), 0, DateUtil.currentGMTTime(), null);
        }
    }

    @Override
    public AgentControlAnswer onConsoleAccessAuthentication(ConsoleAccessAuthenticationCommand cmd) {
        long vmId = 0;

        String ticketInUrl = cmd.getTicket();
        if (ticketInUrl == null) {
            s_logger.error("Access ticket could not be found, you could be running an old version of console proxy. vmId: " + cmd.getVmId());
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Console authentication. Ticket in url for " + cmd.getHost() + ":" + cmd.getPort() + "-" + cmd.getVmId() + " is " + ticketInUrl);
        }

        String ticket = ConsoleProxyServlet.genAccessTicket(cmd.getHost(), cmd.getPort(), cmd.getSid(), cmd.getVmId());
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Console authentication. Ticket in 1 minute boundary for " + cmd.getHost() + ":" + cmd.getPort() + "-" + cmd.getVmId() + " is " + ticket);
        }

        if (!ticket.equals(ticketInUrl)) {
            Date now = new Date();
            // considering of minute round-up
            String minuteEarlyTicket = ConsoleProxyServlet.genAccessTicket(cmd.getHost(), cmd.getPort(), cmd.getSid(), cmd.getVmId(), new Date(now.getTime() - 60 * 1000));

            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Console authentication. Ticket in 2-minute boundary for " + cmd.getHost() + ":" + cmd.getPort() + "-" + cmd.getVmId() + " is " + minuteEarlyTicket);
            }

            if (!minuteEarlyTicket.equals(ticketInUrl)) {
                s_logger.error("Access ticket expired or has been modified. vmId: " + cmd.getVmId() + "ticket in URL: " + ticketInUrl + ", tickets to check against: " + ticket + ","
                        + minuteEarlyTicket);
                return new ConsoleAccessAuthenticationAnswer(cmd, false);
            }
        }

        if (cmd.getVmId() != null && cmd.getVmId().isEmpty()) {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Invalid vm id sent from proxy(happens when proxy session has terminated)");
            }
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        try {
            vmId = Long.parseLong(cmd.getVmId());
        } catch (NumberFormatException e) {
            s_logger.error("Invalid vm id " + cmd.getVmId() + " sent from console access authentication", e);
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        // TODO authentication channel between console proxy VM and management
        // server needs to be secured,
        // the data is now being sent through private network, but this is
        // apparently not enough
        VMInstanceVO vm = _instanceDao.findById(vmId);
        if (vm == null) {
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        if (vm.getHostId() == null) {
            s_logger.warn("VM " + vmId + " lost host info, failed authentication request");
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        HostVO host = _hostDao.findById(vm.getHostId());
        if (host == null) {
            s_logger.warn("VM " + vmId + "'s host does not exist, fail authentication request");
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        String sid = cmd.getSid();
        if (sid == null || !sid.equals(vm.getVncPassword())) {
            s_logger.warn("sid " + sid + " in url does not match stored sid " + vm.getVncPassword());
            return new ConsoleAccessAuthenticationAnswer(cmd, false);
        }

        return new ConsoleAccessAuthenticationAnswer(cmd, true);
    }

    @Override
    public void onAgentConnect(HostVO host, StartupCommand cmd) {
        // if (host.getType() == Type.ConsoleProxy) {
        // // TODO we can use this event to mark the proxy is up and
        // // functioning instead of
        // // pinging the console proxy VM command port
        // //
        // // for now, just log a message
        // if (s_logger.isInfoEnabled()) {
        // s_logger.info("Console proxy agent is connected. proxy: " + host.getName());
        // }
        //
        // /* update public/private ip address */
        // if (_IpAllocator != null && _IpAllocator.exteralIpAddressAllocatorEnabled()) {
        // try {
        // ConsoleProxyVO console = findConsoleProxyByHost(host);
        // if (console == null) {
        // s_logger.debug("Can't find console proxy ");
        // return;
        // }
        // console.setPrivateIpAddress(cmd.getPrivateIpAddress());
        // console.setPublicIpAddress(cmd.getPublicIpAddress());
        // console.setPublicNetmask(cmd.getPublicNetmask());
        // _consoleProxyDao.persist(console);
        // } catch (NumberFormatException e) {
        // }
        // }
        // }
    }

    @Override
    public void onAgentDisconnect(long agentId, com.cloud.host.Status state) {
        if (state == com.cloud.host.Status.Alert || state == com.cloud.host.Status.Disconnected) {
            // be it either in alert or in disconnected state, the agent process
            // may be gone in the VM,
            // we will be reacting to stop the corresponding VM and let the scan
            // process to
            HostVO host = _hostDao.findById(agentId);
            if (host.getType() == Type.ConsoleProxy) {
                String name = host.getName();
                if (s_logger.isInfoEnabled()) {
                    s_logger.info("Console proxy agent disconnected, proxy: " + name);
                }
                if (name != null && name.startsWith("v-")) {
                    String[] tokens = name.split("-");
                    long proxyVmId = 0;
                    try {
                        proxyVmId = Long.parseLong(tokens[1]);
                    } catch (NumberFormatException e) {
                        s_logger.error("Unexpected exception " + e.getMessage(), e);
                        return;
                    }

                    final ConsoleProxyVO proxy = this._consoleProxyDao.findById(proxyVmId);
                    if (proxy != null) {

                        // Disable this feature for now, as it conflicts with
                        // the case of allowing user to reboot console proxy
                        // when rebooting happens, we will receive disconnect
                        // here and we can't enter into stopping process,
                        // as when the rebooted one comes up, it will kick off a
                        // newly started one and trigger the process
                        // continue on forever

                        /*
                         * _capacityScanScheduler.execute(new Runnable() { public void run() { if(s_logger.isInfoEnabled())
                         * s_logger.info("Stop console proxy " + proxy.getName() +
                         * " VM because of that the agent running inside it has disconnected" ); stopProxy(proxy.getId()); } });
                         */
                    } else {
                        if (s_logger.isInfoEnabled()) {
                            s_logger.info("Console proxy agent disconnected but corresponding console proxy VM no longer exists in DB, proxy: " + name);
                        }
                    }
                } else {
                    assert (false) : "Invalid console proxy name: " + name;
                }
            }
        }
    }

    private boolean reserveStandbyCapacity() {
        ConsoleProxyManagementState state = getManagementState();
        if (state == null || state != ConsoleProxyManagementState.Auto)
            return false;

        return true;
    }

    private boolean allowToLaunchNew(long dcId) {
        List<ConsoleProxyVO> l = _consoleProxyDao.getProxyListInStates(dcId, VirtualMachine.State.Starting, VirtualMachine.State.Running, VirtualMachine.State.Stopping, VirtualMachine.State.Stopped,
                VirtualMachine.State.Migrating, VirtualMachine.State.Shutdowned, VirtualMachine.State.Unknown);

        String value = _configDao.getValue(Config.ConsoleProxyLaunchMax.key());
        int launchLimit = NumbersUtil.parseInt(value, 10);
        return l.size() < launchLimit;
    }

    private HypervisorType currentHypervisorType(long dcId) {
        List<ConsoleProxyVO> l = _consoleProxyDao.getProxyListInStates(dcId, VirtualMachine.State.Starting, VirtualMachine.State.Running, VirtualMachine.State.Stopping, VirtualMachine.State.Stopped,
                VirtualMachine.State.Migrating, VirtualMachine.State.Shutdowned, VirtualMachine.State.Unknown);

        return l.size() > 0 ? l.get(0).getHypervisorType() : HypervisorType.Any;
    }

    private boolean checkCapacity(ConsoleProxyLoadInfo proxyCountInfo, ConsoleProxyLoadInfo vmCountInfo) {

        if (proxyCountInfo.getCount() * _capacityPerProxy - vmCountInfo.getCount() <= _standbyCapacity) {
            return false;
        }

        return true;
    }

    private void allocCapacity(long dataCenterId) {
        if (s_logger.isTraceEnabled()) {
            s_logger.trace("Allocate console proxy standby capacity for data center : " + dataCenterId);
        }

        ConsoleProxyVO proxy = null;
        if (_allocProxyLock.lock(ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_SYNC)) {
            try {
                proxy = assignProxyFromStoppedPool(dataCenterId);
                if (proxy == null) {
                    if (s_logger.isInfoEnabled()) {
                        s_logger.info("No stopped console proxy is available, need to allocate a new console proxy");
                    }

                    try {
                        proxy = startNew(dataCenterId);
                    } catch (ConcurrentOperationException e) {
                        s_logger.info("Concurrent Operation caught " + e);
                    }
                } else {
                    if (s_logger.isInfoEnabled()) {
                        s_logger.info("Found a stopped console proxy, bring it up to running pool. proxy vm id : " + proxy.getId());
                    }
                }
            } finally {
                _allocProxyLock.unlock();
            }
        } else {
            if (s_logger.isInfoEnabled()) {
                s_logger.info("Unable to acquire proxy allocation lock, skip for next time");
            }
        }

        if (proxy != null) {
            long proxyVmId = proxy.getId();
            proxy = startProxy(proxyVmId);

            if (proxy != null) {
                if (s_logger.isInfoEnabled()) {
                    s_logger.info("Console proxy " + proxy.getHostName() + " is started");
                }
            }
        }
    }

    public boolean isZoneReady(Map<Long, ZoneHostInfo> zoneHostInfoMap, long dataCenterId) {
        ZoneHostInfo zoneHostInfo = zoneHostInfoMap.get(dataCenterId);
        if (zoneHostInfo != null && isZoneHostReady(zoneHostInfo)) {
            VMTemplateVO template = _templateDao.findSystemVMTemplate(dataCenterId);
            HostVO secondaryStorageHost = _storageMgr.getSecondaryStorageHost(dataCenterId);
            boolean templateReady = false;

            if (template != null && secondaryStorageHost != null) {
                VMTemplateHostVO templateHostRef = _vmTemplateHostDao.findByHostTemplate(secondaryStorageHost.getId(), template.getId());
                templateReady = (templateHostRef != null) && (templateHostRef.getDownloadState() == Status.DOWNLOADED);
            }

            if (templateReady) {
                List<Pair<Long, Integer>> l = _consoleProxyDao.getDatacenterStoragePoolHostInfo(dataCenterId, _use_lvm);
                if (l != null && l.size() > 0 && l.get(0).second().intValue() > 0) {
                    return true;
                } else {
                    if (s_logger.isTraceEnabled()) {
                        s_logger.trace("Primary storage is not ready, wait until it is ready to launch console proxy");
                    }
                }
            } else {
                if (s_logger.isTraceEnabled()) {
                    s_logger.trace("Zone host is ready, but console proxy template is not ready");
                }
            }
        }
        return false;
    }

    private boolean isZoneHostReady(ZoneHostInfo zoneHostInfo) {
        int expectedFlags = 0;
        if (_use_storage_vm) {
            expectedFlags = RunningHostInfoAgregator.ZoneHostInfo.ROUTING_HOST_MASK;
        } else {
            expectedFlags = RunningHostInfoAgregator.ZoneHostInfo.ALL_HOST_MASK;
        }

        return (zoneHostInfo.getFlags() & expectedFlags) == expectedFlags;
    }

    private synchronized Map<Long, ZoneHostInfo> getZoneHostInfo() {
        Date cutTime = DateUtil.currentGMTTime();
        List<RunningHostCountInfo> l = _hostDao.getRunningHostCounts(new Date(cutTime.getTime() - ClusterManager.DEFAULT_HEARTBEAT_THRESHOLD));

        RunningHostInfoAgregator aggregator = new RunningHostInfoAgregator();
        if (l.size() > 0) {
            for (RunningHostCountInfo countInfo : l) {
                aggregator.aggregate(countInfo);
            }
        }

        return aggregator.getZoneHostInfoMap();
    }

    @Override
    public String getName() {
        return _name;
    }

    @Override
    public boolean start() {
        if (s_logger.isInfoEnabled()) {
            s_logger.info("Start console proxy manager");
        }

        return true;
    }

    @Override
    public boolean stop() {
        if (s_logger.isInfoEnabled()) {
            s_logger.info("Stop console proxy manager");
        }

        this._loadScanner.stop();
        _allocProxyLock.releaseRef();
        return true;
    }

    @Override
    public Long convertToId(String vmName) {
        if (!VirtualMachineName.isValidConsoleProxyName(vmName, _instance)) {
            return null;
        }
        return VirtualMachineName.getConsoleProxyId(vmName);
    }

    @Override
    public boolean stopProxy(long proxyVmId) {
        ConsoleProxyVO proxy = _consoleProxyDao.findById(proxyVmId);
        if (proxy == null) {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Stopping console proxy failed: console proxy " + proxyVmId + " no longer exists");
            }
            return false;
        }

        try {
            return _itMgr.stop(proxy, _accountMgr.getSystemUser(), _accountMgr.getSystemAccount());
        } catch (ResourceUnavailableException e) {
            s_logger.warn("Stopping console proxy " + proxy.getHostName() + " failed : exception " + e.toString());
            return false;
        }
    }

    @Override
    @DB
    public void setManagementState(ConsoleProxyManagementState state) {
        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();

            ConsoleProxyManagementState lastState = getManagementState();
            if (lastState == null) {
                txn.commit();
                return;
            }

            if (lastState != state) {
                _configDao.update(Config.ConsoleProxyManagementLastState.key(), lastState.toString());
                _configDao.update(Config.ConsoleProxyManagementState.key(), state.toString());
            }

            txn.commit();
        } catch (Throwable e) {
            txn.rollback();
        }
    }

    @Override
    public ConsoleProxyManagementState getManagementState() {
        String value = _configDao.getValue(Config.ConsoleProxyManagementState.key());
        if (value != null) {
            ConsoleProxyManagementState state = ConsoleProxyManagementState.valueOf(value);

            if (state == null) {
                s_logger.error("Invalid console proxy management state: " + value);
            }
            return state;
        }

        s_logger.error("Invalid console proxy management state: " + value);
        return null;
    }

    @Override
    @DB
    public void resumeLastManagementState() {
        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
            ConsoleProxyManagementState state = getManagementState();
            ConsoleProxyManagementState lastState = getLastManagementState();
            if (lastState == null) {
                txn.commit();
                return;
            }

            if (lastState != state) {
                _configDao.update(Config.ConsoleProxyManagementState.key(), lastState.toString());
            }

            txn.commit();
        } catch (Throwable e) {
            txn.rollback();
        }
    }

    private ConsoleProxyManagementState getLastManagementState() {
        String value = _configDao.getValue(Config.ConsoleProxyManagementLastState.key());
        if (value != null) {
            ConsoleProxyManagementState state = ConsoleProxyManagementState.valueOf(value);

            if (state == null) {
                s_logger.error("Invalid console proxy management state: " + value);
            }
            return state;
        }

        s_logger.error("Invalid console proxy management state: " + value);
        return null;
    }

    @Override
    public boolean rebootProxy(long proxyVmId) {
        final ConsoleProxyVO proxy = _consoleProxyDao.findById(proxyVmId);

        if (proxy == null || proxy.getState() == State.Destroyed) {
            return false;
        }

        if (proxy.getState() == State.Running && proxy.getHostId() != null) {
            final RebootCommand cmd = new RebootCommand(proxy.getInstanceName());
            final Answer answer = _agentMgr.easySend(proxy.getHostId(), cmd);

            if (answer != null && answer.getResult()) {
                if (s_logger.isDebugEnabled()) {
                    s_logger.debug("Successfully reboot console proxy " + proxy.getHostName());
                }

                SubscriptionMgr.getInstance().notifySubscribers(ConsoleProxyManager.ALERT_SUBJECT, this,
                        new ConsoleProxyAlertEventArgs(ConsoleProxyAlertEventArgs.PROXY_REBOOTED, proxy.getDataCenterId(), proxy.getId(), proxy, null));

                return true;
            } else {
                if (s_logger.isDebugEnabled()) {
                    s_logger.debug("failed to reboot console proxy : " + proxy.getHostName());
                }

                return false;
            }
        } else {
            return startProxy(proxyVmId) != null;
        }
    }

    @Override
    public boolean destroyProxy(long vmId) {
        ConsoleProxyVO proxy = _consoleProxyDao.findById(vmId);
        try {
            return _itMgr.expunge(proxy, _accountMgr.getSystemUser(), _accountMgr.getSystemAccount());
        } catch (ResourceUnavailableException e) {
            s_logger.warn("Unable to expunge " + proxy, e);
            return false;
        }
    }

    private String getAllocProxyLockName() {
        return "consoleproxy.alloc";
    }

    private void prepareDefaultCertificate() {
        GlobalLock lock = GlobalLock.getInternLock("consoleproxy.cert.setup");
        try {
            if (lock.lock(ACQUIRE_GLOBAL_LOCK_TIMEOUT_FOR_SYNC)) {
                KeystoreVO ksVo = _ksDao.findByName(CERTIFICATE_NAME);
                if (ksVo == null) {
                    _ksDao.save(CERTIFICATE_NAME, certContent, keyContent, "realhostip.com");
                }
                lock.unlock();
            }
        } finally {
            lock.releaseRef();
        }
    }

    @Override
    public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
        if (s_logger.isInfoEnabled()) {
            s_logger.info("Start configuring console proxy manager : " + name);
        }

        _name = name;

        ComponentLocator locator = ComponentLocator.getCurrentLocator();
        ConfigurationDao configDao = locator.getDao(ConfigurationDao.class);
        if (configDao == null) {
            throw new ConfigurationException("Unable to get the configuration dao.");
        }

        Map<String, String> configs = configDao.getConfiguration("management-server", params);

        _proxyRamSize = NumbersUtil.parseInt(configs.get(Config.ConsoleProxyRamSize.key()), DEFAULT_PROXY_VM_RAMSIZE);
        _proxyCpuMHz = NumbersUtil.parseInt(configs.get(Config.ConsoleProxyCpuMHz.key()), DEFAULT_PROXY_VM_CPUMHZ);

        String value = configs.get(Config.ConsoleProxyCmdPort.key());
        value = configs.get("consoleproxy.sslEnabled");
        if (value != null && value.equalsIgnoreCase("true")) {
            _sslEnabled = true;
        }

        value = configs.get(Config.ConsoleProxyCapacityScanInterval.key());
        _capacityScanInterval = NumbersUtil.parseLong(value, DEFAULT_CAPACITY_SCAN_INTERVAL);

        _capacityPerProxy = NumbersUtil.parseInt(configs.get("consoleproxy.session.max"), DEFAULT_PROXY_CAPACITY);
        _standbyCapacity = NumbersUtil.parseInt(configs.get("consoleproxy.capacity.standby"), DEFAULT_STANDBY_CAPACITY);
        _proxySessionTimeoutValue = NumbersUtil.parseInt(configs.get("consoleproxy.session.timeout"), DEFAULT_PROXY_SESSION_TIMEOUT);

        value = configs.get("consoleproxy.port");
        if (value != null) {
            _consoleProxyPort = NumbersUtil.parseInt(value, ConsoleProxyManager.DEFAULT_PROXY_VNC_PORT);
        }

        value = configs.get(Config.ConsoleProxyDisableRpFilter.key());
        if (value != null && value.equalsIgnoreCase("true")) {
            _disable_rp_filter = true;
        }

        value = configs.get(Config.SystemVMUseLocalStorage.key());
        if (value != null && value.equalsIgnoreCase("true")) {
            _use_lvm = true;
        }

        value = configs.get("secondary.storage.vm");
        if (value != null && value.equalsIgnoreCase("true")) {
            _use_storage_vm = true;
        }

        if (s_logger.isInfoEnabled()) {
            s_logger.info("Console proxy max session soft limit : " + _capacityPerProxy);
            s_logger.info("Console proxy standby capacity : " + _standbyCapacity);
        }

        _instance = configs.get("instance.name");
        if (_instance == null) {
            _instance = "DEFAULT";
        }

        prepareDefaultCertificate();

        Map<String, String> agentMgrConfigs = configDao.getConfiguration("AgentManager", params);
        _mgmt_host = agentMgrConfigs.get("host");
        if (_mgmt_host == null) {
            s_logger.warn("Critical warning! Please configure your management server host address right after you have started your management server and then restart it, otherwise you won't be able to do console access");
        }

        value = agentMgrConfigs.get("port");
        _mgmt_port = NumbersUtil.parseInt(value, 8250);

        _consoleProxyAllocators = locator.getAdapters(ConsoleProxyAllocator.class);
        if (_consoleProxyAllocators == null || !_consoleProxyAllocators.isSet()) {
            throw new ConfigurationException("Unable to get proxy allocators");
        }

        _listener = new ConsoleProxyListener(this);
        _agentMgr.registerForHostEvents(_listener, true, true, false);

        _itMgr.registerGuru(VirtualMachine.Type.ConsoleProxy, this);

        boolean useLocalStorage = Boolean.parseBoolean(configs.get(Config.SystemVMUseLocalStorage.key()));
        _serviceOffering = new ServiceOfferingVO("System Offering For Console Proxy", 1, _proxyRamSize, _proxyCpuMHz, 0, 0, false, null, useLocalStorage, true, null, true);
        _serviceOffering.setUniqueName("Cloud.com-ConsoleProxy");
        _serviceOffering = _offeringDao.persistSystemServiceOffering(_serviceOffering);

        _loadScanner = new SystemVmLoadScanner<Long>(this);
        _loadScanner.initScan(STARTUP_DELAY, _capacityScanInterval);

        if (s_logger.isInfoEnabled()) {
            s_logger.info("Console Proxy Manager is configured.");
        }
        return true;
    }

    @Override
    public boolean destroyConsoleProxy(DestroyConsoleProxyCmd cmd) throws ServerApiException {
        Long proxyId = cmd.getId();

        // verify parameters
        ConsoleProxyVO proxy = _consoleProxyDao.findById(proxyId);
        if (proxy == null) {
            throw new InvalidParameterValueException("unable to find a console proxy with id " + proxyId);
        }

        return destroyProxy(proxyId);
    }

    protected ConsoleProxyManagerImpl() {
    }

    @Override
    public boolean finalizeVirtualMachineProfile(VirtualMachineProfile<ConsoleProxyVO> profile, DeployDestination dest, ReservationContext context) {
        StringBuilder buf = profile.getBootArgsBuilder();
        buf.append(" template=domP type=consoleproxy");
        buf.append(" host=").append(_mgmt_host);
        buf.append(" port=").append(_mgmt_port);
        buf.append(" name=").append(profile.getVirtualMachine().getHostName());
        if (_sslEnabled) {
            buf.append(" premium=true");
        }
        buf.append(" zone=").append(dest.getDataCenter().getId());
        buf.append(" pod=").append(dest.getPod().getId());
        buf.append(" guid=Proxy.").append(profile.getId());
        buf.append(" proxy_vm=").append(profile.getId());
        if (_disable_rp_filter) {
            buf.append(" disable_rp_filter=true");
        }

        boolean externalDhcp = false;
        String externalDhcpStr = _configDao.getValue("direct.attach.network.externalIpAllocator.enabled");
        if (externalDhcpStr != null && externalDhcpStr.equalsIgnoreCase("true")) {
            externalDhcp = true;
        }

        for (NicProfile nic : profile.getNics()) {
            int deviceId = nic.getDeviceId();
            if (nic.getIp4Address() == null) {
                buf.append(" eth").append(deviceId).append("ip=").append("0.0.0.0");
                buf.append(" eth").append(deviceId).append("mask=").append("0.0.0.0");
            } else {
                buf.append(" eth").append(deviceId).append("ip=").append(nic.getIp4Address());
                buf.append(" eth").append(deviceId).append("mask=").append(nic.getNetmask());
            }

            if (nic.isDefaultNic()) {
                buf.append(" gateway=").append(nic.getGateway());
                buf.append(" dns1=").append(nic.getDns1());
                if (nic.getDns2() != null) {
                    buf.append(" dns2=").append(nic.getDns2());
                }
            }

            if (nic.getTrafficType() == TrafficType.Management) {
                String mgmt_cidr = _configDao.getValue(Config.ManagementNetwork.key());
                if (NetUtils.isValidCIDR(mgmt_cidr)) {
                    buf.append(" mgmtcidr=").append(mgmt_cidr);
                }
                buf.append(" localgw=").append(dest.getPod().getGateway());
            }
        }

        /* External DHCP mode */
        if (externalDhcp) {
            buf.append(" bootproto=dhcp");
        }

        String bootArgs = buf.toString();
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Boot Args for " + profile + ": " + bootArgs);
        }

        return true;
    }

    @Override
    public boolean finalizeDeployment(Commands cmds, VirtualMachineProfile<ConsoleProxyVO> profile, DeployDestination dest, ReservationContext context) {

        finalizeCommandsOnStart(cmds, profile);

        ConsoleProxyVO proxy = profile.getVirtualMachine();
        DataCenter dc = dest.getDataCenter();
        List<NicProfile> nics = profile.getNics();
        for (NicProfile nic : nics) {
            if ((nic.getTrafficType() == TrafficType.Public && dc.getNetworkType() == NetworkType.Advanced)
                    || (nic.getTrafficType() == TrafficType.Guest && (dc.getNetworkType() == NetworkType.Basic || dc.isSecurityGroupEnabled()))) {
                proxy.setPublicIpAddress(nic.getIp4Address());
                proxy.setPublicNetmask(nic.getNetmask());
                proxy.setPublicMacAddress(nic.getMacAddress());
            } else if (nic.getTrafficType() == TrafficType.Management) {
                proxy.setPrivateIpAddress(nic.getIp4Address());
                proxy.setPrivateMacAddress(nic.getMacAddress());
            }
        }
        _consoleProxyDao.update(proxy.getId(), proxy);
        return true;
    }

    @Override
    public boolean finalizeCommandsOnStart(Commands cmds, VirtualMachineProfile<ConsoleProxyVO> profile) {

        NicProfile managementNic = null;
        NicProfile controlNic = null;
        for (NicProfile nic : profile.getNics()) {
            if (nic.getTrafficType() == TrafficType.Management) {
                managementNic = nic;
            } else if (nic.getTrafficType() == TrafficType.Control && nic.getIp4Address() != null) {
                controlNic = nic;
            }
        }

        if (controlNic == null) {
            if (managementNic == null) {
                s_logger.error("Management network doesn't exist for the console proxy vm " + profile.getVirtualMachine());
                return false;
            }
            controlNic = managementNic;
        }

        CheckSshCommand check = new CheckSshCommand(profile.getInstanceName(), controlNic.getIp4Address(), 3922, 5, 20);
        cmds.addCommand("checkSsh", check);

        return true;
    }

    @Override
    public boolean finalizeStart(VirtualMachineProfile<ConsoleProxyVO> profile, long hostId, Commands cmds, ReservationContext context) {
        CheckSshAnswer answer = (CheckSshAnswer) cmds.getAnswer("checkSsh");
        if (answer == null || !answer.getResult()) {
            if (answer != null) {
                s_logger.warn("Unable to ssh to the VM: " + answer.getDetails());
            } else {
                s_logger.warn("Unable to ssh to the VM: null answer");
            }
            return false;
        }

        return true;
    }

    @Override
    public void finalizeExpunge(ConsoleProxyVO proxy) {
        proxy.setPublicIpAddress(null);
        proxy.setPublicMacAddress(null);
        proxy.setPublicNetmask(null);
        proxy.setPrivateMacAddress(null);
        proxy.setPrivateIpAddress(null);
        _consoleProxyDao.update(proxy.getId(), proxy);
    }

    @Override
    public void startAgentHttpHandlerInVM(StartupProxyCommand startupCmd) {
        StartConsoleProxyAgentHttpHandlerCommand cmd = null;
        if (_configDao.isPremium()) {
            String storePassword = String.valueOf(_random.nextLong());
            byte[] ksBits = _ksMgr.getKeystoreBits(ConsoleProxyManager.CERTIFICATE_NAME, ConsoleProxyManager.CERTIFICATE_NAME, storePassword);

            assert (ksBits != null);
            if (ksBits == null) {
                s_logger.error("Could not find and construct a valid SSL certificate");
            }
            cmd = new StartConsoleProxyAgentHttpHandlerCommand(ksBits, storePassword);
        } else {
            cmd = new StartConsoleProxyAgentHttpHandlerCommand();
        }

        try {
            long proxyVmId = startupCmd.getProxyVmId();
            ConsoleProxyVO consoleProxy = _consoleProxyDao.findById(proxyVmId);
            assert (consoleProxy != null);
            HostVO consoleProxyHost = _hostDao.findConsoleProxyHost(consoleProxy.getHostName(), Type.ConsoleProxy);

            Answer answer = _agentMgr.send(consoleProxyHost.getId(), cmd);
            if (answer == null || !answer.getResult()) {
                s_logger.error("Console proxy agent reported that it failed to execute http handling startup command");
            } else {
                s_logger.info("Successfully sent out command to start HTTP handling in console proxy agent");
            }
        } catch (AgentUnavailableException e) {
            s_logger.error("Unable to send http handling startup command to the console proxy resource for proxy:" + startupCmd.getProxyVmId(), e);
        } catch (OperationTimedoutException e) {
            s_logger.error("Unable to send http handling startup command(time out) to the console proxy resource for proxy:" + startupCmd.getProxyVmId(), e);
        } catch (Exception e) {
            s_logger.error("Unexpected exception when sending http handling startup command(time out) to the console proxy resource for proxy:" + startupCmd.getProxyVmId(), e);
        }
    }

    @Override
    public ConsoleProxyVO persist(ConsoleProxyVO proxy) {
        return _consoleProxyDao.persist(proxy);
    }

    @Override
    public ConsoleProxyVO findById(long id) {
        return _consoleProxyDao.findById(id);
    }

    @Override
    public ConsoleProxyVO findByName(String name) {
        if (!VirtualMachineName.isValidConsoleProxyName(name)) {
            return null;
        }
        return findById(VirtualMachineName.getConsoleProxyId(name));
    }

    @Override
    public void finalizeStop(VirtualMachineProfile<ConsoleProxyVO> profile, StopAnswer answer) {
    }

    @Override
    public String getScanHandlerName() {
        return "consoleproxy";
    }

    @Override
    public void onScanStart() {
        // to reduce possible number of DB queries for capacity scan, we run following aggregated queries in preparation stage
        _zoneHostInfoMap = getZoneHostInfo();

        _zoneProxyCountMap = new HashMap<Long, ConsoleProxyLoadInfo>();
        List<ConsoleProxyLoadInfo> listProxyCounts = _consoleProxyDao.getDatacenterProxyLoadMatrix();
        for (ConsoleProxyLoadInfo info : listProxyCounts) {
            _zoneProxyCountMap.put(info.getId(), info);
        }

        _zoneVmCountMap = new HashMap<Long, ConsoleProxyLoadInfo>();
        List<ConsoleProxyLoadInfo> listVmCounts = _consoleProxyDao.getDatacenterSessionLoadMatrix();
        for (ConsoleProxyLoadInfo info : listVmCounts) {
            _zoneVmCountMap.put(info.getId(), info);
        }
    }

    private void scanManagementState() {
        ConsoleProxyManagementState state = getManagementState();
        if (state != null) {
            switch (state) {
            case Auto:
            case Manual:
            case Suspending:
                break;

            case ResetSuspending:
                handleResetSuspending();
                break;

            default:
                assert (false);
            }
        }
    }

    private void handleResetSuspending() {
        List<ConsoleProxyVO> runningProxies = _consoleProxyDao.getProxyListInStates(State.Running);
        for (ConsoleProxyVO proxy : runningProxies) {
            s_logger.info("Stop console proxy " + proxy.getId() + " because of we are currently in ResetSuspending management mode");
            this.stopProxy(proxy.getId());
        }

        // check if it is time to resume
        List<ConsoleProxyVO> proxiesInTransition = _consoleProxyDao.getProxyListInStates(State.Running, State.Starting, State.Stopping);
        if (proxiesInTransition.size() == 0) {
            s_logger.info("All previous console proxy VMs in transition mode ceased the mode, we will now resume to last management state");
            this.resumeLastManagementState();
        }
    }

    @Override
    public boolean canScan() {
        // take the chance to do management-state management
        scanManagementState();

        if (!reserveStandbyCapacity()) {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Reserving standby capacity is disable, skip capacity scan");
            }
            return false;
        }

        // config var for consoleproxy.restart check
        String restart = _configDao.getValue("consoleproxy.restart");
        if (restart != null && restart.equalsIgnoreCase("false")) {
            s_logger.debug("Capacity scan disabled purposefully, consoleproxy.restart = false. This happens when the primarystorage is in maintenance mode");
            return false;
        }

        return true;
    }

    @Override
    public Long[] getScannablePools() {
        List<DataCenterVO> zones = _dcDao.listEnabledZones();

        Long[] dcIdList = new Long[zones.size()];
        int i = 0;
        for (DataCenterVO dc : zones) {
            dcIdList[i++] = dc.getId();
        }

        return dcIdList;
    }

    @Override
    public boolean isPoolReadyForScan(Long pool) {
        // pool is at zone basis
        long dataCenterId = pool.longValue();

        if (!isZoneReady(_zoneHostInfoMap, dataCenterId)) {
            if (s_logger.isDebugEnabled())
                s_logger.debug("Zone " + dataCenterId + " is not ready to launch console proxy yet");
            return false;
        }

        if (s_logger.isDebugEnabled())
            s_logger.debug("Zone " + dataCenterId + " is ready to launch console proxy");
        return true;
    }

    @Override
    public Pair<AfterScanAction, Object> scanPool(Long pool) {
        long dataCenterId = pool.longValue();

        ConsoleProxyLoadInfo proxyInfo = this._zoneProxyCountMap.get(dataCenterId);
        if (proxyInfo == null)
            return new Pair<AfterScanAction, Object>(AfterScanAction.nop, null);

        ConsoleProxyLoadInfo vmInfo = this._zoneVmCountMap.get(dataCenterId);
        if (vmInfo == null)
            vmInfo = new ConsoleProxyLoadInfo();

        if (!checkCapacity(proxyInfo, vmInfo)) {
            if (s_logger.isDebugEnabled())
                s_logger.debug("Expand console proxy standby capacity for zone " + proxyInfo.getName());

            return new Pair<AfterScanAction, Object>(AfterScanAction.expand, null);
        }

        return new Pair<AfterScanAction, Object>(AfterScanAction.nop, null);
    }

    @Override
    public void expandPool(Long pool, Object actionArgs) {
        long dataCenterId = pool.longValue();
        allocCapacity(dataCenterId);
    }

    @Override
    public void shrinkPool(Long pool, Object actionArgs) {
    }

    @Override
    public void onScanEnd() {
    }
}