AksHci

1.0.2

Common.psm1

#########################################################################################
#
# Copyright (c) Microsoft Corporation. All rights reserved.
#
# Common/Shared Functions, Types, and Variables
#
#########################################################################################

#requires -runasadministrator

#region Enums

Add-Type -TypeDefinition @"
using System.Management.Automation;

public enum InstallState
{
    NotInstalled,
    Installing,
    InstallFailed,
    Updating,
    UpdateFailed,
    Uninstalling,
    UninstallFailed,
    Installed
};

public enum DeploymentType
{
    None,
    SingleNode,
    MultiNode
};

public enum LoadBalancerType
{
    unstacked_haproxy,
    stacked_kube_vip
};

public enum VmSize
{
    Default,
    Standard_A2_v2,
    Standard_A4_v2,
    Standard_D2s_v3,
    Standard_D4s_v3,
    Standard_D8s_v3,
    Standard_D16s_v3,
    Standard_D32s_v3,
    Standard_DS2_v2,
    Standard_DS3_v2,
    Standard_DS4_v2,
    Standard_DS5_v2,
    Standard_DS13_v2,
    Standard_K8S_v1,
    Standard_K8S2_v1,
    Standard_K8S3_v1,
    Standard_NK6,
    Standard_NV6,
    Standard_NV12
};

public class VirtualNetwork
{
    public string Name;
    public string VswitchName;
    public string IpAddressPrefix;
    public string Gateway;
    public string[] DnsServers;
    public string MacPoolName;
    public int Vlanid;
    public string VipPoolStart;
    public string VipPoolEnd;
    public string K8snodeIPPoolStart;
    public string K8snodeIPPoolEnd;

    public VirtualNetwork (
        string Name,
        string VswitchName,
        string IpAddressPrefix,
        string Gateway,
        string[] DnsServers,
        string MacPoolName,
        int Vlanid,
        string VipPoolStart,
        string VipPoolEnd,
        string K8snodeIPPoolStart,
        string K8snodeIPPoolEnd

    )
    {
        this.Name = Name;
        this.VswitchName = VswitchName;
        this.IpAddressPrefix = IpAddressPrefix;
        this.Gateway = Gateway;
        this.DnsServers = DnsServers;
        this.MacPoolName = MacPoolName;
        this.Vlanid = Vlanid;
        this.VipPoolStart = VipPoolStart;
        this.VipPoolEnd = VipPoolEnd;
        this.K8snodeIPPoolStart = K8snodeIPPoolStart;
        this.K8snodeIPPoolEnd = K8snodeIPPoolEnd;

    }
    public override string ToString()
    {
        return string.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}\n{6}\n{7}\n{8}\n{9}",
            this.Name,
            this.IpAddressPrefix,
            this.Gateway,
            string.Join(",", this.DnsServers),
            this.MacPoolName,
            this.Vlanid,
            this.VipPoolStart,
            this.VipPoolEnd,
            this.K8snodeIPPoolStart,
            this.K8snodeIPPoolEnd);
    }
}

public class ProxySettings
{
    public string Name;
    public string HTTP;
    public string HTTPS;
    public string NoProxy;
    public string CertFile;
    public PSCredential Credential;

    public ProxySettings (
        PSCredential Credential,
        string Name = "",
        string HTTP = "",
        string HTTPS = "",
        string NoProxy = "",
        string CertFile = ""
    )
    {
        this.Name = Name;
        this.HTTP = HTTP;
        this.HTTPS = HTTPS;
        this.NoProxy = NoProxy;
        this.CertFile = CertFile;
        this.Credential = Credential;
    }
    public override string ToString()
    {
        return string.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}",
            this.Name,
            this.HTTP,
            this.HTTPS,
            this.NoProxy,
            this.CertFile,
            this.Credential.ToString());
    }
}

public class ContainerRegistry
{
    public string Server;
    public PSCredential Credential;

    public ContainerRegistry (
        PSCredential Credential,
        string Server = ""
    )
    {
        this.Server = Server;
        this.Credential = Credential;
    }
    public override string ToString()
    {
        return string.Format("{0}\n{1}",
            this.Server,
            this.Credential.ToString());
    }
}
"@

Add-Type -Language CSharp -ReferencedAssemblies "System.Numerics.dll" @"
using System;
using System.Numerics;
using System.Net;

namespace AKSHCI
{
    public class IPRange
    {
        public IPAddress start, end;
        public override string ToString()
        {
            return string.Format("{0} - {1}", start, end);
        }
    }
    public static class IPUtilities
    {
        public static int CompareIpAddresses(IPAddress ipAddress1, IPAddress ipAddress2)
        {
            byte[] ipAddress1Bytes = ipAddress1.GetAddressBytes();
            byte[] ipAddress2Bytes = ipAddress2.GetAddressBytes();
            Array.Reverse(ipAddress1Bytes);
            Array.Reverse(ipAddress2Bytes);
            Array.Resize<byte>(ref ipAddress1Bytes, 5); // Make sure the first byte is a 0 so BigInterger considers the number as unsigned
            Array.Resize<byte>(ref ipAddress2Bytes, 5); // Make sure the first byte is a 0 so BigInterger considers the number as unsigned
            BigInteger ipAddress1BigInt = new BigInteger(ipAddress1Bytes);
            BigInteger ipAddress2BigInt = new BigInteger(ipAddress2Bytes);
            return BigInteger.Compare(ipAddress1BigInt, ipAddress2BigInt);
        }
        
        public static IPAddress GetLastIpInCidr(IPAddress ipAddressStr, int prefixLength)
        {
            BigInteger fullMask = new BigInteger(0xFFFFFFFF);
            BigInteger mask = ((fullMask >> (prefixLength)) & fullMask);
            byte[] endAddress = mask.ToByteArray();
            Array.Resize<byte>(ref endAddress, 4);
            Array.Reverse(endAddress);
            byte[] ipAddress = ipAddressStr.GetAddressBytes();
           
            if(ipAddress.Length != endAddress.Length)
            {
                throw new System.InvalidOperationException("Address and prefix length are both expected to be IPv4 (" + ipAddress.Length + " != " + endAddress.Length + ")");
            }
            
            for(int i = 0; i < ipAddress.Length; i++)
            {
                endAddress[i] = (byte) (endAddress[i] | ipAddress[i]);
            }

            return new IPAddress(endAddress);
        }

        public static IPAddress ToIPAddress(BigInteger bi)
        {
            var bytes = bi.ToByteArray();
            Array.Resize<byte>(ref bytes, 4);
            Array.Reverse(bytes);
            return new IPAddress(bytes);
        }

        public static BigInteger ToBigInteger(IPAddress ip)
        {
            var ipBytes = ip.GetAddressBytes();
            Array.Reverse(ipBytes);
            Array.Resize<byte>(ref ipBytes, ipBytes.Length + 1); // Make sure the first byte is a 0 so BigInterger considers the number as unsigned
            return new BigInteger(ipBytes);
        }

        public static void ToRange(string CIDR, out IPAddress start, out IPAddress end)
        {
            var s = CIDR.Split('/');
            start = IPAddress.Parse(s[0]);
            var prefixLength = int.Parse(s[1]);
            end = AKSHCI.IPUtilities.GetLastIpInCidr(start, prefixLength);
        }

        public static bool ValidateRange(string rangeStart, string rangeEnd)
        {
            var start = IPAddress.Parse(rangeStart);
            var startBI = ToBigInteger(start);

            var end = IPAddress.Parse(rangeEnd);
            var endBI = ToBigInteger(end);

            if (endBI < startBI)
            {
                return false;
            }
            return true;
        }

        public static bool ValidateIPInCIDR(string ip, string CIDR)
        {
            var ipaddress = IPAddress.Parse(ip);
            var ipBI = ToBigInteger(ipaddress);

            IPAddress cidrStart, cidrEnd;
            ToRange(CIDR, out cidrStart, out cidrEnd);
            var cidrStartBI = ToBigInteger(cidrStart);
            var cidrEndBI = ToBigInteger(cidrEnd);

            if ((ipBI >= cidrStartBI) && (ipBI <= cidrEndBI))
            {
                return true;
            }
            return false;

        }
        public static bool ValidateRangeInCIDR(string rangeStart, string rangeEnd, string CIDR)
        {
            if (ValidateIPInCIDR(rangeStart, CIDR) && ValidateIPInCIDR(rangeEnd, CIDR))
            {
                return true;
            }
            return false;
        }

        public static IPRange[] GetVMIPPool(string vippoolStart, string vippoolEnd, string CIDR)
        {
            var start = IPAddress.Parse(vippoolStart);
            var startBI = ToBigInteger(start);

            var end = IPAddress.Parse(vippoolEnd);
            var endBI = ToBigInteger(end);

            IPAddress cidrStart, cidrEnd;
            ToRange(CIDR, out cidrStart, out cidrEnd);
            var cidrStartBI = ToBigInteger(cidrStart);
            var cidrEndBI = ToBigInteger(cidrEnd);

            if ((startBI == cidrStartBI) && (endBI == cidrEndBI))
            {
                throw new Exception(string.Format("The VIP pool range ({0} - {1}) is too large. There is no space to allocate IP addresses for VM's. Try decreasing the size of the VIP pool.", vippoolStart, vippoolEnd));
            }

            if (startBI == cidrStartBI)
            {
                var ippoolstart = ToIPAddress(endBI + 1);
                var ippoolend = ToIPAddress(cidrEndBI);
                return new IPRange[] { new IPRange{ start = ippoolstart, end = ippoolend } };
            }
            else if (endBI == cidrEndBI)
            {
                var ippoolstart = ToIPAddress(cidrStartBI);
                var ippoolend = ToIPAddress(startBI - 1);
                return new IPRange[] { new IPRange { start = ippoolstart, end = ippoolend } };
            }
            else
            {
                var ippool1start = ToIPAddress(cidrStartBI);
                var ippool1end = ToIPAddress(startBI - 1);
                var ippool2start = ToIPAddress(endBI + 1);
                var ippool2end = ToIPAddress(cidrEndBI);
                return new IPRange[] { new IPRange { start = ippool1start, end = ippool1end }, new IPRange { start = ippool2start, end = ippool2end } };
            }
        }
    }
}
"@;

#endregion

#region Module constants

$global:AksHciModule = "AksHci"
$global:MocModule = "Moc"
$global:KvaModule = "Kva"
$global:DownloadModule = "DownloadSdk"
$global:CommonModule = "Common"

$global:configurationKeys = @{
    $global:AksHciModule =  "HKLM:SOFTWARE\Microsoft\${global:AksHciModule}PS";
    $global:MocModule =  "HKLM:SOFTWARE\Microsoft\${global:MocModule}PS";
    $global:KvaModule =  "HKLM:SOFTWARE\Microsoft\${global:KvaModule}PS";
}

$global:repositoryName        = "PSGallery"
$global:repositoryNamePreview = "PSGallery"
$global:repositoryUser        = ""
$global:repositoryPass        = ""

#endregion

#region VM size definitions

$global:vmSizeDefinitions =
@(
    # Name, CPU, MemoryGB
    ([VmSize]::Default, "4", "4"),
    ([VmSize]::Standard_A2_v2, "2", "4"),
    ([VmSize]::Standard_A4_v2, "4", "8"),
    ([VmSize]::Standard_D2s_v3, "2", "8"),
    ([VmSize]::Standard_D4s_v3, "4", "16"),
    ([VmSize]::Standard_D8s_v3, "8", "32"),
    ([VmSize]::Standard_D16s_v3, "16", "64"),
    ([VmSize]::Standard_D32s_v3, "32", "128"),
    ([VmSize]::Standard_DS2_v2, "2", "7"),
    ([VmSize]::Standard_DS3_v2, "2", "14"),
    ([VmSize]::Standard_DS4_v2, "8", "28"),
    ([VmSize]::Standard_DS5_v2, "16", "56"),
    ([VmSize]::Standard_DS13_v2, "8", "56"),
    ([VmSize]::Standard_K8S_v1, "4", "2"),
    ([VmSize]::Standard_K8S2_v1, "2", "2"),
    ([VmSize]::Standard_K8S3_v1, "4", "6")
    # Dont expose GPU size until its supported
    #([VmSize]::Standard_NK6, "6", "12"),
    #([VmSize]::Standard_NV6, "6", "64"),
    #([VmSize]::Standard_NV12, "12", "128")
)

#endregion

#region Pod names and selectors

$global:managementPods =
@(
    ("Cloud Operator", "cloudop-system", "control-plane=controller-manager"),
    ("Cluster API core", "capi-system", "cluster.x-k8s.io/provider=cluster-api"),
    ("Bootstrap kubeadm", "capi-kubeadm-bootstrap-system", "cluster.x-k8s.io/provider=bootstrap-kubeadm"),
    ("Control Plane kubeadm", "capi-kubeadm-control-plane-system", "cluster.x-k8s.io/provider=control-plane-kubeadm"),
    ("Cluster API core Webhook", "capi-webhook-system", "cluster.x-k8s.io/provider=cluster-api"),
    ("Bootstrap kubeadm Webhook", "capi-webhook-system", "cluster.x-k8s.io/provider=bootstrap-kubeadm"),
    ("Control Plane kubeadm Webhook", "capi-webhook-system", "cluster.x-k8s.io/provider=control-plane-kubeadm"),
    ("AzureStackHCI Provider", "caph-system", "cluster.x-k8s.io/provider=infrastructure-azurestackhci"),
    ("AzureStackHCI Provider Webhook", "capi-webhook-system", "cluster.x-k8s.io/provider=infrastructure-azurestackhci")
)

#endregion

#region Classes
class NetworkPlugin {
    
    [string] $Name
    static [string] $Default = "flannel" # TODO: we can't default to calico yet because windows doesn't suppor it

    NetworkPlugin(
        [string] $name
    )
    {
        $curatedName = $name.ToLower()
        if ($curatedName -ne "flannel" -and $curatedName -ne "calico")
        {
            throw "Invalid CNI '$curatedName'. The only supported CNIs are 'flannel' and 'calico'"
        }
        $this.Name = $curatedName
    }

    NetworkPlugin()
    {
        $this.Name = [NetworkPlugin]::Default
    }
}
#endregion

#region Script Constants
$global:installDirectoryName           = "AksHci"
$global:workingDirectoryName           = "AksHci"
$global:imageDirectoryName             = "AksHciImageStore"
$global:yamlDirectoryName              = "yaml"
$global:cloudConfigDirectoryName       = "wssdcloudagent"
$global:nodeConfigDirectoryName        = "wssdagent"

$global:installDirectory               = $($env:ProgramFiles + "\" + $global:installDirectoryName)
$global:defaultworkingDir              = $($env:SystemDrive + "\" + $global:workingDirectoryName)
$global:defaultStagingShare            = ""

$global:nodeAgentBinary                = "wssdagent.exe"
$global:cloudAgentBinary               = "wssdcloudagent.exe"
$global:nodeCtlBinary                  = "nodectl.exe"
$global:cloudCtlBinary                 = "mocctl.exe"
$global:kubectlBinary                  = "kubectl.exe"
$global:kvactlBinary                   = "kvactl.exe"
$global:cloudOperatorYaml              = "cloud-operator.yaml"

$global:nodeAgentFullPath              = [io.Path]::Combine($global:installDirectory, $global:nodeAgentBinary)
$global:cloudAgentFullPath             = [io.Path]::Combine($global:installDirectory, $global:cloudAgentBinary)
$global:nodeCtlFullPath                = [io.Path]::Combine($global:installDirectory, $global:nodeCtlBinary)
$global:cloudCtlFullPath               = [io.Path]::Combine($global:installDirectory, $global:cloudCtlBinary)
$global:kubeCtlFullPath                = [io.Path]::Combine($global:installDirectory, $global:kubectlBinary)
$global:kvaCtlFullPath                 = [io.Path]::Combine($global:installDirectory, $global:kvactlBinary)

$script:psConfigKeyName                = "psconfig"
$script:psConfigJson                   = "psconfig.json"
$global:psConfigDirectoryRoot          = $($env:USERPROFILE)
$global:mocMetadataRoot                = $($env:USERPROFILE + "\.wssd")
$global:mocMetadataDirectory           = [io.Path]::Combine($global:mocMetadataRoot, "mocctl" )
$global:kvaMetadataDirectory           = [io.Path]::Combine($global:mocMetadataRoot, "kvactl" )
$global:accessFileLocation             = [io.Path]::Combine($global:mocMetadataDirectory, "cloudconfig")

$global:defaultCloudConfigLocation     = $($env:SystemDrive + "\programdata\" + $global:cloudConfigDirectoryName)
$global:defaultNodeConfigLocation      = $($env:SystemDrive + "\programdata\" + $global:nodeConfigDirectoryName)

$global:defaultTargetK8Version         = "v1.19.7"
$global:defaultMgmtReplicas            = 1

$global:defaultMgmtControlPlaneVmSize  = [VmSize]::Standard_A4_v2
$global:defaultControlPlaneVmSize      = [VmSize]::Standard_A4_v2
$global:defaultLoadBalancerVmSize      = [VmSize]::Standard_A4_v2
$global:defaultWorkerVmSize            = [VmSize]::Standard_K8S3_v1

$global:defaultNodeAgentPort       = 45000
$global:defaultNodeAuthorizerPort  = 45001

$global:defaultCloudAgentPort      = 55000
$global:defaultCloudAuthorizerPort = 65000

$global:defaultVipPoolName    = "clusterVipPool"
$global:defaultMacPoolStart   = ""
$global:defaultMacPoolEnd     = ""
$global:defaultVlanID         = 0

$global:failoverCluster         = $null
$global:cloudAgentAppName       = "ca"

$global:cloudName               = "moc-cloud"
$global:defaultCloudLocation    = "MocLocation"
$global:cloudGroupPrefix        = "clustergroup"
$global:cloudStorageContainer   = "MocStorageContainer"
$global:cloudMacPool            = "MocMacPool"

$global:defaultPodCidr         = "10.244.0.0/16"
$global:mgmtClusterCidr        = "10.200.0.0/16"
$global:mgmtControlPlaneCidr   = "10.240.0.0/24"

$global:workloadPodCidr        = "10.244.0.0/16"
$global:workloadServiceCidr    = "10.96.0.0/12"

$global:defaultProxyExemptions = "localhost,127.0.0.1,.svc,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16"
$global:credentialKey          = (24,246,163,38,50,244,215,218,223,10,65,98,19,1,149,106,190,141,144,180,157,135,211,143)

$global:clusterNameRegex       = "^[a-z0-9][a-z0-9-]*[a-z0-9]$"

$global:defaultLogLineCount = 500000

$global:operatorTokenValidity = 60
$global:addonTokenValidity = 60
$global:certificateValidityFactor = 1.0

# Temporary until cross-platform signing is available
$global:expectedAuthResponse = @{
    "Status" = "Valid";
    "SignatureType" = "Authenticode";
    "StatusMessage" = ""
}

#endregion

#region User Configuration and Defaults

#region Configuration Functions

function Set-VNetConfiguration
{
    param (
        [Parameter(Mandatory=$true)]
        [String] $module,
        [Parameter(Mandatory=$true)]
        [VirtualNetwork] $vnet
    )
    Set-ConfigurationValue -name "vnetName" -value $vnet.Name -module $module
    Set-ConfigurationValue -name "vswitchName" -value $vnet.VswitchName -module $module
    Set-ConfigurationValue -name "ipaddressprefix" -value $vnet.IpAddressPrefix -module $module
    Set-ConfigurationValue -name "gateway" -value $vnet.Gateway -module $module
    Set-ConfigurationValue -name "dnsservers" -value ($vnet.DnsServers -join ",") -module $module
    Set-ConfigurationValue -name "macpoolname" -value $vnet.MacPoolName -module $module
    Set-ConfigurationValue -name "vlanid" -value $vnet.Vlanid -module $module
    Set-ConfigurationValue -name "vnetvippoolstart" -value $vnet.VipPoolStart -module $module
    Set-ConfigurationValue -name "vnetvippoolend" -value $vnet.VipPoolEnd -module $module
    Set-ConfigurationValue -name "k8snodeippoolstart" -value $vnet.K8snodeIPPoolStart -module $module
    Set-ConfigurationValue -name "k8snodeippoolend" -value $vnet.K8snodeIPPoolEnd -module $module        

}

function Get-VNetConfiguration
{
    param (
        [Parameter(Mandatory=$true)]
        [String] $module
    )
    $vnet_name = Get-ConfigurationValue -name "vnetName" -module $module
    $vnet_vswitchname = Get-ConfigurationValue -name "vswitchName" -module $module
    $vnet_ipaddressprefix = Get-ConfigurationValue -name "ipaddressprefix" -module $module
    $vnet_gateway = Get-ConfigurationValue -name "gateway" -module $module
    $vnet_dnsservers = (Get-ConfigurationValue -name "dnsservers" -module $module) -split ","
    $vnet_macpoolname = Get-ConfigurationValue -name "macpoolname" -module $module
    $vnet_vlanid = Get-ConfigurationValue -name "vlanid" -module $module
    $vnet_vippoolstart = Get-ConfigurationValue -name "vnetvippoolstart" -module $module
    $vnet_vippoolend = Get-ConfigurationValue -name "vnetvippoolend" -module $module
    $vnet_k8snodeippoolstart = Get-ConfigurationValue -name "k8snodeippoolstart" -module $module
    $vnet_k8snodeippoolend = Get-ConfigurationValue -name "k8snodeippoolend" -module $module

    return [VirtualNetwork]::new($vnet_name, $vnet_vswitchname, $vnet_ipaddressprefix, $vnet_gateway, $vnet_dnsservers, $vnet_macpoolname, $vnet_vlanid, $vnet_vippoolstart, $vnet_vippoolend, $vnet_k8snodeippoolstart, $vnet_k8snodeippoolend)
}

function New-VirtualNetwork
{
    <#
    .DESCRIPTION
        A wrapper around [VirutalNetwork]::new that Validates parameters before returning a VirtualNetwork object

    .PARAMETER name
        The name of the vnet

    .PARAMETER vswitchName
        The name of the vswitch

    .PARAMETER MacPoolName
        The name of the mac pool

    .PARAMETER vlanID
        The VLAN ID for the vnet

    .PARAMETER ipaddressprefix
        The address prefix to use for static IP assignment

    .PARAMETER gateway
        The gateway to use when using static IP

    .PARAMETER dnsservers
        The dnsservers to use when using static IP

    .PARAMETER vippoolstart
        The starting ip address to use for the vip pool.
        The vip pool addresses will be used by the k8s API server and k8s services'

    .PARAMETER vippoolend
        The ending ip address to use for the vip pool.
        The vip pool addresses will be used by the k8s API server and k8s services

    .PARAMETER k8snodeippoolstart
        The starting ip address to use for VM's in the cluster.

    .PARAMETER k8snodeippoolend
        The ending ip address to use for VM's in the cluster.

    .OUTPUTS
        VirtualNetwork object

    .EXAMPLE
        New-VirtualNetwork -name External -vswitchname External -vippoolstart 172.16.0.0 -vippoolend 172.16.0.240
        
    .EXAMPLE
        New-VirtualNetwork -name "defaultswitch" -vswitchname "Default Switch" -ipaddressprefix 172.16.0.0/24 -gateway 172.16.0.1 -dnsservers 4.4.4.4, 8.8.8.8 -vippoolstart 172.16.0.0 -vippoolend 172.16.0.240
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $name,

        [Parameter(Mandatory=$true)]
        [string] $vswitchName,

        [Parameter(Mandatory=$false)]
        [String] $MacPoolName = $global:cloudMacPool,

        [Parameter(Mandatory=$false)]
        [int] $vlanID = $global:defaultVlanID,

        [Parameter(Mandatory=$false)]
        [String] $ipaddressprefix,

        [Parameter(Mandatory=$false)]
        [String] $gateway,

        [Parameter(Mandatory=$false)]
        [String[]] $dnsservers,

        [Parameter(Mandatory=$true)]
        [String] $vippoolstart,

        [Parameter(Mandatory=$true)]
        [String] $vippoolend,

        [Parameter(Mandatory=$false)]
        [String] $k8snodeippoolstart,

        [Parameter(Mandatory=$false)]
        [String] $k8snodeippoolend
    )

    Test-ValidNetworkName -Name $name | Out-Null

    if ($dnsservers)
    {
        foreach ($dns in $dnsservers)
        {
            try
            {
                Test-ValidEndpoint -endpoint $dns
            }
            catch
            {
                throw ("$dnsservers is not a valid list of ip addresses. Please enter a valid list of ip addresses: E.g. -dnsservers 4.4.4.4, 8.8.8.8")
            }
        }
    }

    if ($ipaddressprefix -or $gateway -or $dnsservers -or $k8snodeippoolstart -or $k8snodeippoolend)
    {
        if (-not $ipaddressprefix -or -not $gateway -or -not $dnsservers -or -not $k8snodeippoolstart -or -not $k8snodeippoolend)
        {
            throw "ipaddressprefix, gateway, dnsservers, k8snodeippoolstart, and k8snodeippoolend must all be specified to use a static ip configuration"
        }
    }

    if ($ipaddressprefix)
    {
        Test-ValidCIDR -CIDR $ipaddressprefix
    }

    Test-ValidPool -PoolStart $vippoolstart -PoolEnd $vippoolend -CIDR $ipaddressprefix

    if ($k8snodeippoolstart -and $k8snodeippoolend)
    {
        Test-ValidPool -PoolStart $k8snodeippoolstart -PoolEnd $k8snodeippoolend -CIDR $ipaddressprefix
    }

    return [VirtualNetwork]::new($name, $vswitchname, $ipaddressprefix, $gateway, $dnsservers, $MacPoolName, $vlanID, $vippoolstart, $vippoolend, $k8snodeippoolstart, $k8snodeippoolend)
}


#region configuration
function Save-ConfigurationDirectory
{
    <#
    .DESCRIPTION
        Saves the workingDir of configuration in registry.
        Handles multinode as well.
    
    .PARAMETER WorkingDir
        WorkingDir to be persisted
    
    .PARAMETER moduleName
        Name of the module
    #>
    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName,
        [Parameter(Mandatory=$true)]
        [String] $WorkingDir
    )

    $configDir = [io.Path]::Combine($WorkingDir, "." + $moduleName)
    Write-Status "Saving Configuration Directory [$configDir]" -moduleName $moduleName

    if (Test-MultiNodeDeployment)
    {
        # *. If Multinode, replicate this across all nodes
        Get-ClusterNode -ErrorAction Stop | ForEach-Object {
            Invoke-Command -ComputerName $_.Name -ScriptBlock  {
                $regPath = $args[0]
                $regKey = $args[1]
                $regValue = $args[2]

                if (!(Test-Path ($regPath)))
                {
                    New-Item -Path $regPath | Out-Null
                }
                Set-ItemProperty -Path $regPath -Name $regKey  -Value $regValue  -Force | Out-Null
            } -ArgumentList @($global:configurationKeys[$moduleName], $script:psConfigKeyName, $configDir)
        }
    }
    else 
    {
        # *. If Standalone, store it locally
        if (!(Test-Path ($global:configurationKeys[$moduleName])))
        {
            New-Item -Path $global:configurationKeys[$moduleName] | Out-Null
        }

        Set-ItemProperty -Path $global:configurationKeys[$moduleName] -Name $script:psConfigKeyName  -Value $configDir -Force | Out-Null
    }
}

function Set-SecurePermissionFolder
{
    <#
    .DESCRIPTION
        Initialize folder with appropriate permissions
    
    .PARAMETER Path
        path of config folder.
    #>
    param (
        [parameter(Mandatory=$true)]
        [string]$Path

    )
    
    $acl = Get-Acl $Path
    $acl.SetAccessRuleProtection($true,$false)
    $accessRule = New-Object System.Security.AccessControl.FileSystemAccessRule("BUILTIN\Administrators","FullControl","ContainerInherit,ObjectInherit", "None", "Allow")
    $acl.SetAccessRule($accessRule)
    $acl | Set-Acl $Path
}

function Set-SecurePermissionFile
{
    <#
    .DESCRIPTION
        Initialize file with appropriate permissions
    
    .PARAMETER Path
        path of file.
    #>
    param (
        [parameter(Mandatory=$true)]
        [string]$Path

    )
    
    # ACL the yaml so that it is only readable by administrator
    $acl = Get-Acl $Path
    $acl.SetAccessRuleProtection($true,$false)
    $accessRule = New-Object System.Security.AccessControl.FileSystemAccessRule("BUILTIN\Administrators","FullControl","Allow")
    $acl.SetAccessRule($accessRule)
    $acl | Set-Acl $Path
}


function Reset-ConfigurationDirectory
{
    <#
    .DESCRIPTION
        Cleanup workingDir info in registry that has been saved
    
    .PARAMETER moduleName
        Name of the module
    #>
    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    Write-Status "Resetting Configuration Directory" -moduleName $moduleName
    if (Test-MultiNodeDeployment)
    {
        # *. If Multinode, remove this across all nodes
        Get-ClusterNode -ErrorAction Stop | ForEach-Object {
            Invoke-Command -ComputerName $_.Name -ScriptBlock  {
                $regPath = $args[0]
                Remove-Item -Path $regPath -Force -ErrorAction SilentlyContinue | Out-Null
            } -ArgumentList @($global:configurationKeys[$moduleName])
        }
    }
    else 
    {
        # *. If Standalone, remove it locally
        Remove-Item -Path $global:configurationKeys[$moduleName] -Force -ErrorAction SilentlyContinue | Out-Null
    }
}
function Get-ConfigurationDirectory
{
    <#
    .DESCRIPTION
        Gets the Working Directory of configuration from the registry
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    # 1. If the psconfig path is available, try to use it.
    $regVal = Get-ItemPropertyValue -Path $global:configurationKeys[$moduleName] -Name $script:psConfigKeyName  -ErrorAction SilentlyContinue
    if ($regVal)
    {
        return $regVal
    }
    # 2. If not, use the default path
    return [io.Path]::Combine($global:psConfigDirectoryRoot, "." + $moduleName)
}

function Get-ConfigurationFile
{
    <#
    .DESCRIPTION
        Get the configuration file to be used for persisting configurations
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    $configFile = [io.Path]::Combine((Get-ConfigurationDirectory -moduleName $moduleName), $script:psConfigJson)
    # Write-Status "Configuration file for $moduleName => [$configFile]"
    return $configFile
}

function Test-Configuration
{
    <#
    .DESCRIPTION
        Tests if a configuration exists
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    # Write-Status "Testing Configuration for $moduleName"
    return Test-Path -Path (Get-ConfigurationFile -moduleName $moduleName)
}

function Reset-Configuration
{
    <#
    .DESCRIPTION
        Resets the configuration
        Resets also the configuration info that persisted in registry.
        Does a double cleanup so the one in working dir as well as user directory is removed
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    Write-Status "Resetting Configuration"  -moduleName $moduleName
    # 1. Remove the shared configuration
    if (Test-Configuration -moduleName $moduleName)
    {
        Remove-Item -Path (Get-ConfigurationDirectory -moduleName $moduleName) -Recurse -Force -ErrorAction SilentlyContinue
    }
    Reset-ConfigurationDirectory -moduleName $moduleName

    # 2. Remove the local configuration, if any
    if (Test-Configuration -moduleName $moduleName)
    {
        Remove-Item -Path (Get-ConfigurationDirectory -moduleName $moduleName) -Recurse -Force -ErrorAction SilentlyContinue
    }
    $global:config[$moduleName] = @{}
}

function Save-Configuration
{
    <#
    .DESCRIPTION
        saves a configuration to persisted storage
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    $configFile = Get-ConfigurationFile -moduleName $moduleName
    $configDir = [IO.Path]::GetDirectoryName($configFile)
    if (!(Test-Path $configDir))
    {
        New-Item -ItemType Directory -Force -Path $configDir | Out-Null
    }

    Write-Status "Saving Configuration for $moduleName => $configFile" -moduleName $moduleName

    ConvertTo-Json -InputObject $global:config[$moduleName] | Out-File -FilePath $configFile
}

function Import-Configuration
{
    <#
    .DESCRIPTION
        Loads a configuration from persisted storage
    
    .PARAMETER moduleName
        Name of the module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string] $moduleName
    )
    # Write-Status "Importing Configuration for $moduleName"

    $tmp = ConvertFrom-Json -InputObject (Get-Content (Get-ConfigurationFile -moduleName $moduleName) -Raw)
    $global:config[$moduleName] = @{}
    $tmp.psobject.Properties | ForEach-Object  { $global:config[$moduleName][$_.Name] = $_.Value}
}

function Set-ConfigurationValue
{
    <#
    .DESCRIPTION
        Persists a configuration value to the registry
 
    .PARAMETER name
        Name of the configuration value

    .PARAMETER moduleName
        Name of the module

    .PARAMETER value
        Value to be persisted
    #>
    param (
        [String] $name,
        [Parameter(Mandatory=$true)]
        [String] $module,
        [Object] $value
    )

    $global:config[$module][$name] = $value
    Save-Configuration -moduleName $module
}

function Get-ConfigurationValue
{
    <#
    .DESCRIPTION
        Retrieves a configuration value from the registry
 
    .PARAMETER type
        The expected type of the value being retrieved

    .PARAMETER module
        module of the module
    
    .PARAMETER name
        Name of the configuration value
    #>
    param (
        [Type] $type = [System.String],
        [Parameter(Mandatory=$true)]
        [String] $module,
        [String] $name
    )

    $value = $null
    if  (Test-Configuration -moduleName $module)
    {
        Import-Configuration -moduleName $module
        $value = $global:config[$module][$name]
    }

    switch($type.Name)
    {
        "Boolean"            { if (!$value) {$value = 0} return [System.Convert]::ToBoolean($value) }
        "UInt32"             { if (!$value) {$value = 0} return [System.Convert]::ToUInt32($value) }
        "VmSize"             { if (!$value) {$value = 0} return [Enum]::Parse([VmSize], $value, $true) }
        "DeploymentType"     { if (!$value) {$value = 0} return [Enum]::Parse([DeploymentType], $value, $true) }
        "InstallState"       { if (!$value) {$value = 0} return [Enum]::Parse([InstallState], $value, $true) }
        "LoadBalancerType"   { if (!$value) {$value = 0} return [Enum]::Parse([LoadBalancerType], $value, $true) }
        Default              { if (!$value) {$value = ""} return $value }
    }
}

#endregion

function Test-IsProductInstalled()
{
    <#
    .DESCRIPTION
        Tests if the desired product/module is installed (or installing). Note that we consider some
        failed states (e.g. UninstallFailed) to represent that the product is still installed, albeit
        in a unknown/failed state.

    .PARAMETER moduleName
        The module name to test for installation state

    .PARAMETER activity
        Activity name to use when writing progress
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName,

        [Parameter()]
        [String]$activity = $MyInvocation.MyCommand.Name
    )

    Write-StatusWithProgress -activity $activity -moduleName $moduleName -status $("Verifying product installation state")

    $currentState = Get-InstallState -module $moduleName
    if (-not $currentState)
    {
        return $false
    }

    switch($currentState)
    {
        $([InstallState]::NotInstalled) { return $false }
        $([InstallState]::InstallFailed) { return $false }
    }

    return $true
}

function Get-InstallState
{
    <#
    .DESCRIPTION
        Returns the installation state for a product/module. May return $null.
 
    .PARAMETER moduleName
        The module name to query
    #>

    param (
        [String] $moduleName
    )

    $state = Get-ConfigurationValue -module $moduleName -name "InstallState" -type ([Type][InstallState])
    if (-not $state)
    {
        $state = [InstallState]::NotInstalled
    }

    Write-SubStatus -moduleName $moduleName $("Installation state is: $state")
    return $state
}

function Test-ValidEndpoint
{
    <#
    .DESCRIPTION
        Validates that an endpoint is a valid ip address
        
        This function exists to validate that a endpoint is a valid ip address. If the enpoint is not a valid ip address, it throws.
 
    .PARAMETER endpoint
        A string representing an IP address
    #>
    param (
        [String] $endpoint
    )

    if (-not [ipaddress]::TryParse($endpoint,[ref]$null))
    {
        throw ("$endpoint is not a valid ip address. Please enter a valid ip address in the form 1.1.1.1")
    }
}

function Test-ValidK8sObjectName
{
    <#
    .DESCRIPTION
        Validates the format of a name that will be used as the name of a kubernetes object
        
        This function exists so that multiple other functions can re-use the same validation rather
        than us repeating it all over the script (ValidatePattern does not allow variables to be
        used for the regex string as it must be a constant). We throw to provide a more specific
        error message to the caller.
 
    .PARAMETER Name
        The name of an k8s object
    .PARAMETER Type
        Currently we are only using k8s names for clusters and networks
    #>
    param (
        [String] $Name,
        [ValidateSet("cluster","network")]
        [String] $Type
    )

    if (-not ($Name -cmatch $clusterNameRegex))
    {
        throw $("'$Name' is not a valid $Type name. Names must be lower-case and match the regex pattern: '$clusterNameRegex'")
    }

    return $true
}

function Test-ValidClusterName
{
    <#
    .DESCRIPTION
        Validates the format of a cluster name.
        
        This function exists so that multiple other functions can re-use the same validation rather
        than us repeating it all over the script (ValidatePattern does not allow variables to be
        used for the regex string as it must be a constant). We throw to provide a more specific
        error message to the caller.
 
    .PARAMETER Name
        A cluster name
    #>
    param (
        [String] $Name
    )
    return Test-ValidK8sObjectName -Name $Name -Type "cluster"
}

function Test-ValidNetworkName
{
    <#
    .DESCRIPTION
        Validates the format of a network name.
        
        This function exists so that multiple other functions can re-use the same validation rather
        than us repeating it all over the script (ValidatePattern does not allow variables to be
        used for the regex string as it must be a constant). We throw to provide a more specific
        error message to the caller.
 
    .PARAMETER Name
        A network name
    #>
    param (
        [String] $Name
    )
    return Test-ValidK8sObjectName -Name $Name -Type "network"
}

function Test-ForUpdates
{
    <#
    .DESCRIPTION
        Check if a module is up to date and provide the option to update it.

    .PARAMETER moduleName
        The name of the module.

    .PARAMETER repositoryName
        Powershell repository name.

    .PARAMETER repositoryUser
        Powershell repository username.

    .PARAMETER repositoryPass
        Powershell repository password.
    #>

    param (
        [String] $moduleName,
        [String] $repositoryName,
        [String] $repositoryUser,
        [String] $repositoryPass
    )

    if ($global:config[$moduleName]["skipUpdates"])
    {
        return
    }

    Write-Status $("Check module updates") -moduleName $moduleName

    $proxyParameters = @{}
    $proxyConfig = Get-ProxyConfiguration -moduleName $moduleName

    if ($proxyConfig.HTTPS)
    {
        $proxyParameters.Add("Proxy", $proxyConfig.HTTPS)
    }
    elseif ($proxyConfig.HTTP)
    {
        $proxyParameters.Add("Proxy", $proxyConfig.HTTP)
    }

    if ($proxyConfig.Credential)
    {
        $proxyParameters.Add("ProxyCredential", $proxyConfig.Credential)
    }

    $current = Get-InstalledModule -Name "PowershellGet" -ErrorAction SilentlyContinue
    if (($null -eq $current) -or ($current.version -lt 1.6.0))
    {
        Write-SubStatus "PowershellGet is too old and needs to be updated. Updating now...`n" -moduleName $moduleName

        $parameters = @{
            Name = "PowershellGet"
            Force = $true
            Confirm = $false
            SkipPublisherCheck = $true
        }
        $parameters += $proxyParameters
        Install-Module @parameters

        Write-SubStatus "PowershellGet was updated. This window *must* now be closed. Please re-run the script to continue." -moduleName $moduleName
        exit 0
    }

    $patToken = $repositoryPass | ConvertTo-SecureString -AsPlainText -Force
    $repositoryCreds = New-Object System.Management.Automation.PSCredential($repositoryUser, $patToken)

    $current = Get-InstalledModule -Name $moduleName -ErrorAction SilentlyContinue

    # TODO: Skip alpha/preview updates for now
    if ($current.Repository -ieq $global:repositoryNamePreview)
    {
        Write-SubStatus "Your current version is a pre-release. Updates will be skipped.`n" -moduleName $moduleName
        return
    }

    $parameters = @{
        Name = $moduleName
        Repository = $repositoryName
        Credential = $repositoryCreds
        ErrorAction = "SilentlyContinue"
    }
    $parameters += $proxyParameters

    $latest = Find-Module @parameters
    if (($null -eq $current) -or ($null -eq $latest))
    {
        Write-SubStatus "Warning: Unable to check for updates" -moduleName $moduleName
        return
    }

    Write-SubStatus $("Installed module version is "+$current.version) -moduleName $moduleName
    Write-SubStatus $("Latest module version is "+$latest.version) -moduleName $moduleName

    if ([System.Version]$current.version -ge [System.Version]$latest.version)
    {
        Write-SubStatus "You are already up to date" -moduleName $moduleName
        return
    }

    Write-SubStatus $("A newer version of "+$moduleName+" is available!") -moduleName $moduleName

    $title    = 'Recommended update'
    $question = "Do you want to update to the latest version of the module/binaries? If you choose 'Yes' then we will perform a full cleanup of your deployment before applying the updates.`n"
    $choices  = '&Yes', '&No'

    $decision = $Host.UI.PromptForChoice($title, $question, $choices, 0)
    if ($decision -eq 0)
    {
        Write-Status "Installing updates" -moduleName $moduleName

        $parameters = @{
            Name = $moduleName
            Credential = $repositoryCreds
            Force = $true
        }
        $parameters += $proxyParameters
        Update-Module @parameters

        $current = Get-InstalledModule -Name $moduleName -ErrorAction SilentlyContinue
        Write-SubStatus $("Installed module version is now "+$current.version+"`n") -moduleName $moduleName

        if ([System.Version]$current.version -ge [System.Version]$latest.version)
        {
            Write-SubStatus $("Removing older versions of the module...`n") -moduleName $moduleName
            Get-InstalledModule -Name $moduleName -AllVersions | Where-Object {$_.Version -ne $current.Version} | Uninstall-Module -Force -Confirm:$false -ErrorAction:SilentlyContinue

            Write-SubStatus "The update was successful! This window *must* now be closed. Please re-run the script to continue." -moduleName $moduleName
            exit 0
        }

        throw $("The update operation was not successful. Your installed module version ("+$current.version+") is still older than the latest version ("+$latest.version+").")
    }
}

function Initialize-Environment
{
    <#
    .DESCRIPTION
        Executes steps to prepare the environment for operations. This includes checking
        to ensure that the module is up to date and that a configuration is present.

    .PARAMETER moduleName
        The name of the module.

    .PARAMETER repositoryName
        Powershell repository name.

    .PARAMETER repositoryUser
        Powershell repository username.

    .PARAMETER repositoryPass
        Powershell repository password.

    .PARAMETER checkForUpdates
        Should the script check for updates before proceeding to prepare the environment.

    .PARAMETER createIfNotPresent
        Should the script create a new deployment configuration if one is not present.
    #>

    param (
        [Parameter()]
        [String] $moduleName,
        [Parameter()]
        [String] $repositoryName = $global:repositoryName,
        [Parameter()]
        [String] $repositoryUser = $global:repositoryUser,
        [Parameter()]
        [String] $repositoryPass = $global:repositoryPass,
        [Parameter()]
        [Switch]$checkForUpdates,
        [Parameter()]
        [Switch]$createIfNotPresent
    )

    Initialize-ProxyEnvironment -moduleName $moduleName

    if ($checkForUpdates.IsPresent)
    {
        Test-ForUpdates -moduleName $moduleName -repositoryName $repositoryName -repositoryUser $repositoryUser -repositoryPass $repositoryPass
    }
}

function Get-FirewallRules
{
    <#
    .DESCRIPTION
        Obtains the firewall rules needed for agent communication
    #>

    $firewallRules =
    @(
        ("wssdagent GRPC server port", "TCP", $global:config[$global:MocModule]["nodeAgentPort"]),
        ("wssdagent GRPC authentication port", "TCP", $global:config[$global:MocModule]["nodeAgentAuthorizerPort"]),
        ("wssdcloudagent GRPC server port", "TCP", $global:config[$global:MocModule]["cloudAgentPort"]),
        ("wssdcloudagent GRPC authentication port", "TCP", $global:config[$global:MocModule]["cloudAgentAuthorizerPort"])
    )
    return $firewallRules
}
#endregion

#region General helper functions

function Write-StatusWithProgress
{
    <#
    .DESCRIPTION
        Outputs status to progress and to console
 
    .PARAMETER status
        The status message

    .PARAMETER activity
        The progress activity

    .PARAMETER percentage
        The progress percentage. 100% will output progress completion

    .PARAMETER moduleName
        The module name. Will become a prefix for console output
    #>

    [CmdletBinding()]
    param (
        [String] $status = "",
        [String] $activity = "Status",
        [Int] $percentage = -1,
        [Switch] $completed,
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    # Propagate verbose preference across modules from the caller, if not explicitly specified
    if (-not $PSBoundParameters.ContainsKey('Verbose'))
    {
        $script:VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')
    }

    $message = $status
    if ($moduleName)
    {
        $eventmessage = $("$activity - $message")
        $message = $("$moduleName - $message")
        Write-ModuleEventLog -moduleName $moduleName -entryType Information -eventId 1 -message $eventmessage
    }

    Write-Progress -Activity $activity -Status $message -PercentComplete $percentage -Completed:$completed.IsPresent
    Write-Status -msg $status -moduleName $moduleName
}

function Write-Status
{
    <#
    .DESCRIPTION
        Outputs status to the console with a prefix for readability
 
    .PARAMETER msg
        The message/object to output

    .PARAMETER moduleName
        The module name. Will be used as a prefix
    #>

    [CmdletBinding()]
    param (
        [Object]$msg,
        [Parameter(Mandatory=$true)]
        [String]$moduleName
    )

    # Propagate verbose preference across modules from the caller, if not explicitly specified
    if (-not $PSBoundParameters.ContainsKey('Verbose'))
    {
        $script:VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')
    }

    if ($msg)
    {
        $time = Get-Date -DisplayHint Time
        Write-Verbose "[$time] [$moduleName] $msg`n"
    }
}

function Write-SubStatus
{
    <#
    .DESCRIPTION
        Outputs sub-status to the console with a indent for readability
 
    .PARAMETER msg
        The message/object to output

    .PARAMETER moduleName
        The module name. Will be used as a prefix

    .PARAMETER indentChar
        Char to use as the indent/bulletpoint of the status message
    #>

    [CmdletBinding()]
    param (
        [Object]$msg,
        [Parameter(Mandatory=$true)]
        [String]$moduleName,
        [String]$indentChar = "`t`t"
    )

    # Propagate verbose preference across modules from the caller, if not explicitly specified
    if (-not $PSBoundParameters.ContainsKey('Verbose'))
    {
        $script:VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')
    }


    Write-Status -msg $($indentChar + $msg) -moduleName $moduleName
}


function GetDefaultLinuxNodepoolName
{
    <#
    .DESCRIPTION
        Gets the Default Linux Nodepool name.
 
    .PARAMETER clusterName
        Cluster Name.
    #>
    param (
        [String]$clusterName
    )

    # GA build named the default nodepools as $Name-default-linux-nodepool
    # fallback if $clusterName-linux is not found.
    $linuxNodepool = Invoke-Kubectl -ignoreError -arguments $("get akshcinodepools/$clusterName-default-linux-nodepool -o json") | ConvertFrom-Json
    if ($null -eq $linuxNodepool)
    {
        return "$clusterName-linux"
    }

    return "$clusterName-default-linux-nodepool"
}


function GetDefaultWindowsNodepoolName
{
    <#
    .DESCRIPTION
        Gets the Default Windows Nodepool Name

    .PARAMETER clusterName
        Cluster Name.
    #>

    param (
        [String]$clusterName
    )

    # GA build named the default nodepools as $Name-default-windows-nodepool
    # fallback if $clusterName-windows is not found.
    $windowsNodepool = Invoke-Kubectl -ignoreError -arguments $("get akshcinodepools/$clusterName-default-windows-nodepool -o json") | ConvertFrom-Json
    if ($null -eq $windowsNodepool)
    {
        return "$clusterName-windows"
    }

    return "$clusterName-default-windows-nodepool"
}

function Test-Process
{
    <#
    .DESCRIPTION
        Test if a process is running.
 
    .PARAMETER processName
        The process name to test.

    .PARAMETER nodeName
        The node to test on.
    #>

    param (
        [String]$processName,
        [String]$nodeName
    )

    Invoke-Command -ComputerName $nodeName -ScriptBlock  {
        $processName = $args[0]
        $process = Get-Process -Name $processName -ErrorAction SilentlyContinue
        if(!$process)
        {
            throw $("$processName is not running on " + ($env:computername))
        }
    } -ArgumentList $processName
}

function Test-LocalFilePath
{
    <#
    .DESCRIPTION
        Returns true if the path appears to be local. False otherwise.
 
    .PARAMETER path
        Path to be tested.
    #>

    param(
        [String]$path
    )

    $path = [System.Environment]::ExpandEnvironmentVariables($path)
    $clusterStorage = Join-Path -Path $([System.Environment]::ExpandEnvironmentVariables("%systemdrive%")) -ChildPath 'clusterstorage'

    if($path.StartsWith('\\') -or $path.ToLower().StartsWith($clusterStorage.ToLower()))
    {
        return $false
    }

    return $true
}

function Stop-AllProcesses
{
    <#
    .DESCRIPTION
        Kill all instance of the given process name.
    #>

    param (
        [string]$processName
    )
    Get-Process -Name $processName -ErrorAction SilentlyContinue | ForEach-Object {
        $_ | Stop-Process -Force
    }
}

function Copy-FileLocal
{
    <#
    .DESCRIPTION
        Copies a file locally.

    .PARAMETER source
        File source.

    .PARAMETER destination
        File destination.
    #>

    param (
        [String]$source,
        [String]$destination
    )
    Write-SubStatus "Copying $source to $destination " -moduleName $global:CommonModule
    Copy-Item -Path $source -Destination $destination
}

function Copy-FileToRemoteNode
{
    <#
    .DESCRIPTION
        Copies a file to a remote node.

    .PARAMETER source
        File source.

    .PARAMETER destination
        File destination.

    .PARAMETER remoteNode
        The remote node to copy to.
    #>

    param (
        [String]$source,
        [String]$destination,
        [String]$remoteNode
    )

    $remotePath = "\\$remoteNode\" + ($destination).Replace(":", "$")
    Write-SubStatus "Copying $source to $remotePath " -moduleName $global:CommonModule
    $remoteDir = [IO.Path]::GetDirectoryName($remotePath)
    if (!(Test-Path $remoteDir))
    {
        New-Item -ItemType Directory -Force -Path $remoteDir | Out-Null
    }

    Copy-Item -Path $source -Destination $remotePath
}

function Test-ForWindowsFeatures
{
    <#
    .DESCRIPTION
        Installs any missing required OS features.

    .PARAMETER features
        The features to check for.

    .PARAMETER nodeName
        The node to execute on.
    #>

    param (
        [String[]]$features,
        [String]$nodeName
    )

    Write-Status "Check for required OS features on $nodeName" -moduleName $global:MocModule
    $nodeEditionName = Invoke-Command -ComputerName $nodeName -ScriptBlock {
        return (get-itemproperty "hklm:\software\microsoft\windows nt\currentversion").editionid
    }

    if (-not ($nodeEditionName -match 'server'))
    {
        throw "This product is only supported on server editions"
    }

    $remoteRebootRequired = Invoke-Command -ComputerName $nodeName -ScriptBlock {
        $rebootRequired = $false
        foreach($feature in $args[0])
        {
            write-verbose $(" - Checking the status of feature '$feature'") 

            $wf = Get-WindowsFeature -Name "$feature" 
            if ($null -eq $wf)
            {
                throw $("Windows feature '$feature' does not seem to be present in this OS version and therefore cannot be enabled.")
            }

            if ($wf.InstallState -ine "Installed")
            {
                write-verbose $(" - Installing missing feature '$feature' ...")

                $result = Install-WindowsFeature -Name "$feature" -WarningAction SilentlyContinue
                if ($result.RestartNeeded)
                {
                    $rebootRequired = $true
                }
            }
        }

        return $rebootRequired
    } -ArgumentList (, $features)

    if ($remoteRebootRequired)
    {
        Write-Status $("OS features were installed and a reboot is required to complete the installation") -moduleName $global:MocModule
        Read-Host $("Press enter when you are ready to reboot $nodeName ...")
        Restart-Computer -ComputerName $nodeName -Force
    }
}

function Enable-Remoting
{
    <#
    .DESCRIPTION
        Enables powershell remoting on the local machine.
    #>

    Write-Status "Enabling powershell remoting..." -moduleName $global:MocModule

    Enable-PSRemoting -Force -Confirm:$false
    winrm quickconfig -q -force
}

function Get-HostRoutingInfo
{
    <#
    .DESCRIPTION
        Obtains the host routing information.

    .PARAMETER nodeName
        The node to execute on.
    #>

    param (
        [String]$nodeName
    )
    return Invoke-Command -ComputerName $nodeName -ScriptBlock {
        $oldProgressPreference = $global:progressPreference
        $global:progressPreference = 'silentlyContinue'
        
        $computerName = "www.msftconnecttest.com"
        $routingInfo = Test-NetConnection -DiagnoseRouting -ComputerName $computerName -ErrorAction SilentlyContinue
        $global:progressPreference = $oldProgressPreference

        if (!$routingInfo -or !$routingInfo.RouteDiagnosticsSucceeded)
        {
            throw $("Unable to obtain host routing. Connectivity test to $computerName failed.")
        }

        return $routingInfo 
    }
}

function Get-HostAdapterName
{
    <#
    .DESCRIPTION
        Obtains the name of the best host network adapter. Uses routing to determine the host interface name to return.

    .PARAMETER nodeName
        The node to execute on.
    #>

    param (
        [String]$nodeName
    )

    $routingInfo = Get-HostRoutingInfo -nodeName $nodeName
    return $routingInfo.OutgoingInterfaceAlias
}

function Get-HostIp
{
    <#
    .DESCRIPTION
        Obtains the hosts IP address. Uses routing to determine the best host IPv4 address to use.

    .PARAMETER nodeName
        The node to execute on.
    #>
    param (
        [String]$nodeName
    )

    $routingInfo = Get-HostRoutingInfo -nodeName $nodeName
    return $routingInfo.SelectedSourceAddress.IPv4Address
}

function Test-Binary
{
    <#
    .DESCRIPTION
        A basic sanity test to make sure that this system is ready to deploy kubernetes.

    .PARAMETER nodeName
        The node to execute on.

    .PARAMETER binaryName
        Binary to check.
    #>

    param (
        [String]$nodeName,
        [String]$binaryName
    )

    Invoke-Command -ComputerName $nodeName -ScriptBlock {
        if ( !(Get-Command $args -ErrorAction SilentlyContinue )) {
            throw $("Expected binary $args is missing.")
        }
    } -ArgumentList $binaryName
}

function Get-CloudFqdn
{
    <#
    .DESCRIPTION
        Determines the right FQDN to use for cloudagent based on the type of deployment and script args
    #>

    return $global:config[$global:MocModule]["cloudFqdn"]
}

function Get-SshPublicKey
{
    <#
    .DESCRIPTION
        Get the SSH Public Key that is configured to be used by the deployment
    #>

    return $global:config[$global:MocModule]["sshPublicKey"]
}

function Get-SshPrivateKey
{
    <#
    .DESCRIPTION
        Get the SSH Private Key that is configured to be used by the deployment
    #>

    return $global:config[$global:MocModule]["sshPrivateKey"]
}

#region invoke methods
function Invoke-CommandLine
{
    <#
    .DESCRIPTION
        Executes a command and optionally ignores errors.

    .PARAMETER command
        Comamnd to execute.

    .PARAMETER arguments
        Arguments to pass to the command.

    .PARAMETER ignoreError
        Optionally, ignore errors from the command (don't throw).

    .PARAMETER showOutput
        Optionally, show live output from the executing command.

    .PARAMETER showOutputAsProgress
        Optionally, show output from the executing command as progress bar updates.

    .PARAMETER progressActivity
        The activity name to display when showOutputAsProgress was requested.

    .PARAMETER moduleName
        The calling module name to show in output logging.
    #>

    param (
        [String]$command,
        [String]$arguments,
        [Switch]$ignoreError,
        [Switch]$showOutput,
        [Switch]$showOutputAsProgress,
        [String]$progressActivity,
        [Parameter(Mandatory=$true)]
        [String]$moduleName
    )

    try {
        if ($showOutputAsProgress.IsPresent)
        {
            $result = (& $command $arguments.Split(" ") | ForEach-Object { $status = $_ -replace "`t"," - "; Write-StatusWithProgress -activity $progressActivity -moduleName $moduleName -Status $status }) 2>&1
        }
        elseif ($showOutput.IsPresent)
        {
            $result = (& $command $arguments.Split(" ") | Out-Default) 2>&1
        }
        else
        {
            $result = (& $command $arguments.Split(" ") 2>&1)
        }
    }
    catch {
        if ($ignoreError.IsPresent)
        {
            return
        }
        throw
    }
    
    $out = $result | Where-Object {$_.gettype().Name -ine "ErrorRecord"}  # On a non-zero exit code, this may contain the error
    #$outString = ($out | Out-String).ToLowerInvariant()

    if ($LASTEXITCODE)
    {
        $err = $result | Where-Object {$_.gettype().Name -eq "ErrorRecord"}
        $errMessage = "$command $arguments returned a non zero exit code $LASTEXITCODE [$err]"
        if ($ignoreError.IsPresent)
        {
            $ignoreMessage = "[IGNORED ERROR] $errMessage"
            Write-Status -msg $ignoreMessage -moduleName $moduleName
            Write-ModuleEventLog -moduleName $moduleName -entryType Warning -eventId 2 -message $errMessage
            return
        }
        throw $errMessage
    }
    return $out
}

function Invoke-Kubectl
{
    <#
    .DESCRIPTION
        Executes a kubectl command.

    .PARAMETER kubeconfig
        The kubeconfig file to use. Defaults to the management kubeconfig.

    .PARAMETER arguments
        Arguments to pass to the command.

    .PARAMETER ignoreError
        Optionally, ignore errors from the command (don't throw).

    .PARAMETER showOutput
        Optionally, show live output from the executing command.
    #>

    param (
        [string] $kubeconfig = $global:config[$global:KvaModule]["kubeconfig"],
        [string] $arguments,
        [switch] $ignoreError,
        [switch] $showOutput
    )

    return Invoke-CommandLine -command $global:kubeCtlFullPath -arguments $("--kubeconfig=$kubeconfig $arguments") -showOutput:$showOutput.IsPresent -ignoreError:$ignoreError.IsPresent -moduleName $global:KvaModule
}

function Invoke-MocShowCommand
{
    <#
    .DESCRIPTION
        Executes a cloudagent command either against a local cloudagent (single node deployment) or a cluster generic
        service (multi-node/cluster deployments).

    .PARAMETER arguments
        Arguments to pass to cloud ctl.

    .PARAMETER ignoreError
        Optionally, ignore errors from the command (don't throw).
    #>

    param (
        [String]$arguments,
        [Switch]$ignoreError,
        [ValidateSet("tsv", "csv", "yaml", "json")]
        [string]$output = "json"
    )

    $arguments += " --output $output"
    $out = Invoke-MocCommand -arguments $arguments -ignoreError:$ignoreError.IsPresent
    if ([string]::IsNullOrWhiteSpace($out))
    {
        return
    }
    return $out | ConvertFrom-Json
}
function Invoke-MocListCommand
{
    <#
    .DESCRIPTION
        Executes a cloudagent command either against a local cloudagent (single node deployment) or a cluster generic
        service (multi-node/cluster deployments).

    .PARAMETER arguments
        Arguments to pass to cloud ctl.

    .PARAMETER ignoreError
        Optionally, ignore errors from the command (don't throw).
    #>

    param (
        [String]$arguments,
        [Switch]$ignoreError,
        [ValidateSet("tsv", "csv", "yaml", "json")]
        [string]$output = "json",
        [string]$filter
    )

    $arguments += " --output $output"
    if ($filter)
    {
        $arguments += " --query ""$filter"""
    }
    $out = Invoke-MocCommand -arguments $arguments -ignoreError:$ignoreError.IsPresent 
    if ([string]::IsNullOrWhiteSpace($out) -or $out -like "No *")
    {
        return
    }
    Write-Verbose "$out"
    return $out | ConvertFrom-Json
}
function Invoke-MocCommand
{
    <#
    .DESCRIPTION
        Executes a cloudagent command either against a local cloudagent (single node deployment) or a cluster generic
        service (multi-node/cluster deployments).

    .PARAMETER arguments
        Arguments to pass to cloud ctl.

    .PARAMETER ignoreError
        Optionally, ignore errors from the command (don't throw).
    #>

    param (
        [String]$arguments,
        [Switch]$ignoreError
    )

    if (-not (Get-Command $global:cloudCtlFullPath -ErrorAction SilentlyContinue)) {
        throw $("Unable to find command "+$global:cloudCtlFullPath)
    }

    $cloudFqdn = Get-CloudFqdn

    $cmdArgs = "--cloudFqdn $cloudFqdn $arguments"
    if ($global:config[$global:MocModule]["insecure"])
    {
        $cmdArgs += " --debug" 
    }

    $response = Invoke-CommandLine -Command $global:cloudCtlFullPath -Arguments $cmdArgs -ignoreError:$ignoreError -moduleName $global:MocModule
    Write-Status $response -moduleName $global:MocModule

    return $response
}

function Invoke-NodeCommand
{
    <#
    .DESCRIPTION
        Executes a nodeagent command.

    .PARAMETER arguments
        Arguments to pass to node ctl.
    #>

    param (
        [String]$arguments
    )

    if (-not (Get-Command $global:nodeCtlFullPath -ErrorAction SilentlyContinue)) {
        throw $("Unable to find command "+$global:nodeCtlFullPath)
    }

    $cmdArgs = "$arguments"
    if ($global:config[$global:MocModule]["insecure"])
    {
        $cmdArgs += " --debug" 
    }

    Invoke-CommandLine -Command $global:nodeCtlFullPath -Arguments $cmdArgs -moduleName $global:MocModule
}

function Invoke-MocLogin
{
    <#
    .DESCRIPTION
        Provisions the Script to have access to node ctl

    .PARAMETER nodeName
        The node to execute on.
    #>
    param (
        [Parameter(Mandatory=$true)]
        [String]$loginYaml
    )
    Invoke-MocCommand $(" security login --loginpath $loginYaml --identity")
}

#end region

function Compress-Directory
{

    <#
    .DESCRIPTION
        Util for zipping folders

    .PARAMETER ZipFilename
        output zip file name

    .PARAMETER SourceDir
        directory to compress
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$ZipFilename,

        [Parameter(Mandatory=$true)]
        [String]$SourceDir
    )

    if (Test-Path $ZipFilename) 
    {

        $title    = 'ZipFile already exists'
        $question = "Do you want to overwrite it?`n"
        $choices  = '&Yes', '&No'

        $decision = $Host.UI.PromptForChoice($title, $question, $choices, 0)
        if ($decision -eq 0) 
        {
            Remove-Item -Path $ZipFilename -Force
        }
        else 
        {
            throw [System.IO.IOException] "file already exists"
        }

   }

   Add-Type -Assembly System.IO.Compression.FileSystem
   $compressionLevel = [System.IO.Compression.CompressionLevel]::Optimal
   [System.IO.Compression.ZipFile]::CreateFromDirectory($SourceDir,$ZipFilename, $compressionLevel, $false)

}


#endregion

#region Resource limit helper functions

function Convert-ParametersToString
{
    <#
    .DESCRIPTION
        Takes a dictionary of parameters and converts them to a string representation.

    .PARAMETER argDictionary
        Dictionary of arguments (e.g. obtained from $PSBoundParameters).

    .PARAMETER stripAsJob
        Optionally remove 'AsJob' if it's included in the argDictionary.
    #>

    param (
        [System.Collections.IDictionary] $argDictionary,
        [Switch] $stripAsJob
    )

    $strArgs = ""
    foreach ($key in $argDictionary.Keys)
    {
        if (($key -ieq "AsJob") -and ($stripAsJob.IsPresent))
        {
            continue
        }

        $seperator = " "
        $val = $argDictionary[$key]
        if (($val -eq $true) -or ($val -eq $false))
        {
            $seperator = ":$"
        }
        $strArgs += " -$key$seperator$val"
    }

    return $strArgs
}

#endregion

#region prechecks

function Test-HCIRegistration
{
    <#
    .DESCRIPTION
       Check the SKU of node and if HCI substrate then check the registration status of the node
    #>

    $osResult = Get-CimInstance -Namespace root/CimV2 -ClassName Win32_OperatingSystem -Property OperatingSystemSKU
    # PRODUCT_AZURESTACKHCI_SERVER_CORE = 406
    # Check if the substrate is HCI
    if ($osResult.OperatingSystemSKU -eq 406)
    {
        #Check if the HCI node is registered else throw error
        $regStatus = (Get-AzureStackHCI).RegistrationStatus
        if ($regStatus -ine "Registered")
        {
            throw "HCI cluster node ($env:computername) is not registered, registrationStatus is $regStatus"
        }
    }
}

function Test-ClusterHealth
{
   <#
    .DESCRIPTION
       Check if cluster node and cluster network are up
   #>
   
   #Check the ClusterNode
   Get-ClusterNode -ErrorAction Stop | ForEach-Object {
       if ($_.State -ine "Up") 
       {
          throw  "Cluster node $_ is not Up. Its current state is $($_.State)."
       }
   }
   Get-ClusterNetwork -ErrorAction Stop | ForEach-Object {
       if ($_.State -ine "Up") 
       {
          throw  "Cluster network $_ is not Up.Its current state is $($_.State)."
       }
   }
}

#endregion

#region Asynchronous job helpers

function Get-BackgroundJob
{
    <#
    .DESCRIPTION
        Returns a background job by name (supports wildcards and may return multiple jobs)
 
    .PARAMETER name
        Name of the job(s).
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $name
    )
 
    return Get-Job -Name $name -ErrorAction SilentlyContinue
}

function New-BackgroundJob
{
    <#
    .DESCRIPTION
        Creates a new background job.
 
    .PARAMETER name
        Name of the job.

    .PARAMETER cmdletName
        Cmdlet to execute as a job

    .PARAMETER argDictionary
        Argument dictionary to pass to the job cmdlet.

    .PARAMETER scheduledJob
        Optionally, use a scheduled job instead of a regular job. This allows the job to execute fully in the background
        and be accessible cross-session. Note that less progress information is available while this type of job is
        running.

    .PARAMETER allowDuplicateJobs
        Optionally, allow a new job to be created even if a job with the same name already exists and is still executing.
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $name,

        [Parameter(Mandatory=$true)]
        [String] $cmdletName,

        [Parameter(Mandatory=$true)]
        [System.Collections.IDictionary] $argDictionary,

        [Parameter()]
        [Switch] $scheduledJob,

        [Parameter()]
        [Switch] $allowDuplicateJobs
    )

    if (-not $allowDuplicateJobs.IsPresent)
    {
        $jobs = Get-BackgroundJob -name $name
        foreach ($job in $jobs)
        {
            if (($job.State -ieq "Completed") -or ($job.State -ieq "Failed"))
            {
                continue
            }
            throw $("A job with the name '$name' already exists and has not yet completed or failed. Please wait or remove it using Remove-Job.")
        }
    }

    $strArgs = Convert-ParametersToString($argDictionary) -stripAsJob

    if ($scheduledJob.IsPresent)
    {
        if (-not $strArgs)
        {
            # Always pass at least one arg
            $strArgs = '-Verbose:$false'
        }
        $options = New-ScheduledJobOption -RunElevated -HideInTaskScheduler
        return Register-ScheduledJob -Name $name -ScheduledJobOption $options -RunNow -ScriptBlock {
            param($p1,$p2)
            #$VerbosePreference = "continue"
            Invoke-Expression $("$p1 $p2")
        } -ArgumentList $cmdletName,$strArgs
    }
    else
    {
        return Start-Job -Name $name -ScriptBlock { Invoke-Expression $("$using:cmdletName $using:strArgs") }
    }
}

#endregion

#region Wait for resource functions

function Wait-ForCloudAgentEndpoint
{
    <#
    .DESCRIPTION
        Waits for the cloudagent generic service VIP/FQDN to be functional (i.e. wait for DNS to propogate).

    .PARAMETER sleepDuration
        Duration to sleep for between attempts
    
    .PARAMETER timeout
        Duration until timeout of waiting

    .PARAMETER activity
        Activity name to use when updating progress
    #>

    param (
        [int]$sleepDuration=20,
        [int]$timeout=3600, #seconds in a hour
        [String]$activity = $MyInvocation.MyCommand.Name
    )

    Write-StatusWithProgress -activity $activity -status $("Waiting for cloudagent API endpoint to be accessible...") -moduleName $global:MocModule
    Write-SubStatus $("Warning: this depends on DNS propogation and can take between 10-30 minutes in some environments...`n") -moduleName $global:MocModule

    $endpoint = Get-CloudFqdn

    ## Start the timer
    $timer = [Diagnostics.Stopwatch]::StartNew()

    while(($timer.Elapsed.TotalSeconds -lt $timeout))
    {
        Write-SubStatus $("Testing cloudagent endpoint: $endpoint") -moduleName $global:MocModule
        $location = $null

        try {
            Clear-DnsClientCache
            if (-Not ($global:config[$global:MocModule]["insecure"]))
            {
                try {
                    Invoke-MocLogin -loginYaml $($global:config[$global:MocModule]["mocLoginYAML"]) | Out-Null
                } catch {
                    Write-Verbose -Message $_
                }
            }
            $location = Get-MocLocation
        } catch {
            Write-Verbose -Message $_
        }

        if ($null -ne $location)
        {
            Write-SubStatus $("Cloudagent VIP is working.") -moduleName $global:MocModule
            return $true
        }

        Sleep $sleepDuration
    }

    return $false
}

function Wait-ForMocRole
{
    <#
    .DESCRIPTION
        Waits for MOC role to be available.

    .PARAMETER roleName
        Name of role to wait on

    .PARAMETER sleepDuration
        Duration to sleep for between attempts

    .PARAMETER timeout
        Duration until timeout of waiting

    .PARAMETER activity
        Activity name to use when updating progress
    #>

    param (
        [Parameter(Mandatory=$true)]
        [string]$roleName = $global:defaultCloudLocation,
        [int]$sleepDuration=5,
        [int]$timeout=120, #seconds
        [String]$activity = $MyInvocation.MyCommand.Name
    )

    Write-StatusWithProgress -activity $activity -moduleName $global:MocModule -status $("Waiting for MOC role $roleName to be available...")

    ## Start the timer
    $timer = [Diagnostics.Stopwatch]::StartNew()

    while(($timer.Elapsed.TotalSeconds -lt $timeout))
    {
        try {
            Get-MocRole -name $roleName | Out-Null
        } catch {
            # When role is not found, exception is thrown
            if (-not ($_.Exception.Message -like "*Not Found*")) {
                Write-SubStatus -moduleName $moduleName  $("Warning: " + $_.Exception.Message)
            }
            Start-Sleep $sleepDuration
            continue
        }

        return $true
    }

    return $false
}

#endregion

function Get-FailoverCluster
{
    <#
    .DESCRIPTION
        Safe wrapper around checking for the presence of a failover cluster.
    #>

    # Check if failover cluster powershell module was installed
    # and only run Get-Cluster in that case
    if (Get-Command "Get-Cluster" -errorAction SilentlyContinue)
    {
        return Get-Cluster -ErrorAction SilentlyContinue
    }

    return $null
}

function Get-KubernetesGalleryImageName 
{
    <#
    .DESCRIPTION
        Returns the appropriate gallery image name based on kubernetes versions

    .PARAMETER k8sVersion
        Kubernetes version

    .PARAMETER imageType
        Image Type
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$k8sVersion,
        
        [Parameter(Mandatory=$true)]
        [ValidateSet("Windows", "Linux")]
        [String]$imageType
    )

    $tmpVersion = ($k8sVersion.TrimStart("v").Replace('.', '-'))

    switch ($imageType)
    {
        "Windows" {  return "Windows_k8s"   }
        "Linux"   {  return "Linux_k8s_"   + $tmpVersion   }
    }
}

function Test-MultiNodeDeployment
{
    <#
    .DESCRIPTION
        Returns true if the script believes this is a multi-node deployment. False otherwise.
    #>
    $failoverCluster = Get-FailoverCluster
    return ($nil -ne $failoverCluster)
}

function Get-Ipv4MaskFromPrefix
{
    <#
    .DESCRIPTION
        Transforms an IP prefix length to an IPv4 net mask.

    .PARAMETER PrefixLength
        Length of the prefix
    #>
    param (
        [Parameter(Mandatory=$true)]
        [int] $PrefixLength
    )

    Add-Type -Language CSharp -ReferencedAssemblies "System.Numerics.dll" @"
using System;
using System.Numerics;

namespace AKSHCI
{
    public static class Ipv4MaskCompute
    {
        public static byte[] GetIpv4MaskFromPrefix(int prefixLength)
        {
            BigInteger fullMask = new BigInteger(0xFFFFFFFF);
            BigInteger mask = ((fullMask << (32 - prefixLength)) & fullMask);
            return mask.ToByteArray();
        }
    }
}
"@;
 
    if ($PrefixLength -lt 0)
    {
        throw "Invalid prefix length $PrefixLength"
    }
    if ($PrefixLength -eq 0)
    {
        return "0.0.0.0"
    }
    if ($PrefixLength -gt 32)
    {
        throw "Invalid prefix length $PrefixLength"
    }

    $maskArray = [AKSHCI.Ipv4MaskCompute]::GetIpv4MaskFromPrefix($PrefixLength)
    return "$($maskArray[3]).$($maskArray[2]).$($maskArray[1]).$($maskArray[0])"
}

function Get-ClusterNetworkPrefixForIp
{
    <#
    .DESCRIPTION
        Returns the cluster network prefix length associated with the given IP, or $null if not found.

    .PARAMETER IpAddress
        Find the cluster network associated with this IP address
    #>
    param (
        [Parameter(Mandatory=$true)]
        [System.Net.IPAddress] $IpAddress
    )
 
    $v4Networks = (Get-ClusterNetwork -ErrorAction SilentlyContinue | Where-Object { $_.Ipv4Addresses.Count -gt 0 })

    foreach($v4Network in $v4Networks) {
        for($i = 0; $i -lt $v4Network.Ipv4Addresses.Count; $i++) {
            [System.Net.IPAddress]$ipv4 = $null
            $clusIpv4 = $v4Network.Ipv4Addresses[$i]
            if (-Not [System.Net.IPAddress]::TryParse($clusIpv4, [ref] $ipv4))
            {
                Write-Warning "Ignoring failover cluster network IPAddress '$clusIpv4' as it couldn't be parsed as an IP address."
                continue
            }
            $lastIp = [AKSHCI.IPUtilities]::GetLastIpInCidr($ipv4, $v4Network.Ipv4PrefixLengths[$i])
            if([AKSHCI.IPUtilities]::CompareIpAddresses($ipAddress, $ipv4) -ge 0 -AND [AKSHCI.IPUtilities]::CompareIpAddresses($ipAddress, $lastIp) -le 0)
            {
                return $v4Network.Ipv4PrefixLengths[$i]
            }
        }
    }

    throw "Could not create the failover cluster generic role. No cluster network could be found for IP '$IpAddress'"
}

function Add-FailoverClusterGenericRole
{
    <#
    .DESCRIPTION
        Creates a generic service role in failover cluster (similar to Add-ClusterGenericServiceRole), but allows for fine tuning network configuration.

    .PARAMETER staticIpCidr
        Static IP and network prefix, using the CIDR format (Example: 192.168.1.2/16)
    
    .PARAMETER serviceDisplayName
        Display name of the service (Example: "WSSD cloud agent service")

    .PARAMETER clusterGroupName
        Name of the cluster group (Example: ca-2f87825b-a4af-473f-8a33-8e3bdd5f9b61)

    .PARAMETER serviceName
        Name of the service binary (Example: wssdcloudagent)
    
    .PARAMETER serviceParameters
        Service start parameters (Example: --fqdn ca-2f87825b-a4af-473f-8a33-8e3bdd5f9b61.contoso.com)
    #>
    param (
        [string] $staticIpCidr,
        [string] $serviceDisplayName,
        [string] $clusterGroupName,
        [string] $serviceName,
        [string] $serviceParameters
    )

    Add-ClusterGroup -Name $clusterGroupName -GroupType GenericService -ErrorAction Stop | Out-Null
    $dnsName = Add-ClusterResource -Name "$clusterGroupName" -ResourceType "Network Name" -Group $clusterGroupName -ErrorAction Stop
    $dnsName | Set-ClusterParameter -Multiple @{"Name"="$clusterGroupName";"DnsName"="$clusterGroupName"} -ErrorAction Stop

    if ([string]::IsNullOrWhiteSpace($staticIpCidr))
    {
        $networkList = Get-ClusterNetwork -ErrorAction SilentlyContinue | Where-Object { $_.Role -eq "ClusterAndClient" }

        foreach ($network in $networkList)
        {
            $IPResourceName = "IPv4 Address on $($network.Address)"
            $IPAddress = Add-ClusterResource -Name $IPResourceName -ResourceType "IP Address" -Group $clusterGroupName -ErrorAction Stop
            $IPAddress | Set-ClusterParameter -Multiple @{"Network"=$network;"EnableDhcp"=1} -ErrorAction Stop
            Add-ClusterResourceDependency -Resource "$clusterGroupName" -Provider $IPResourceName -ErrorAction Stop | Out-Null
        }
    }
    else
    {
        $staticIpCidrArray = $staticIpCidr.Split("/") #Split a string of format x.x.x.x/pp to an array of x.x.x.x and pp
        if ($staticIpCidrArray.Length -eq 1)
        {
            $prefixLength = Get-ClusterNetworkPrefixForIp -IpAddress $staticIpCidrArray[0]
        }
        else
        {
            $prefixLength = $staticIpCidrArray[1]
        }

        $subnetMask = Get-Ipv4MaskFromPrefix -PrefixLength $prefixLength

        $IPResourceName = "IPv4 Address $($staticIpCidrArray[0])"
        $IPAddress = Add-ClusterResource -Name $IPResourceName -ResourceType "IP Address" -Group $clusterGroupName -ErrorAction Stop
        $IPAddress | Set-ClusterParameter -Multiple @{"Address"=$staticIpCidrArray[0];"SubnetMask"=$subnetMask;"EnableDhcp"=0} -ErrorAction Stop
        Add-ClusterResourceDependency -Resource "$clusterGroupName" -Provider $IPResourceName -ErrorAction Stop | Out-Null
    }

    $ServiceConfig = Add-ClusterResource -Name $serviceDisplayName -ResourceType "Generic Service" -Group $clusterGroupName -ErrorAction Stop
    Add-ClusterResourceDependency -Resource $serviceDisplayName -Provider "$clusterGroupName" -ErrorAction Stop | Out-Null

    $ServiceConfig | Set-ClusterParameter -Multiple @{"ServiceName"=$serviceName;"StartupParameters"=$serviceParameters;"UseNetworkName"=1} -ErrorAction Stop

    # Start the cluster group and wait at most 5 minutes for it to come online
    Start-ClusterGroup -Name $clusterGroupName -Wait 300 -ErrorAction Stop

    # Make sure the cluster group is not in the pending state. Wait for up to 5 minutes for the transition to happen
    $caGroupState = (Get-ClusterGroup -Name $clusterGroupName -ErrorAction Stop).State
    $waitStart = [DateTime]::get_Now()
    while ($caGroupState -eq [Microsoft.FailoverClusters.PowerShell.ClusterGroupState]::Pending)
    {
        if (([DateTime]::get_Now() - $waitStart) -ge [Timespan]::FromMinutes(5))
        {
            $failedResources = [String]::Join(", ", (Get-ClusterGroup -Name $clusterGroupName -ErrorAction Stop | Get-ClusterResource -ErrorAction Stop | Where-Object { $_.State -ne [Microsoft.FailoverClusters.PowerShell.ClusterResourceState]::Online }).Name)
            Remove-ClusterGroup -Name $clusterGroupName -RemoveResources -Force -ErrorAction Stop
            throw "Timed out while trying to start the cloud agent generic service in failover cluster. The cluster resource group is in the '$caGroupState' state. Resources in 'failed' or 'pending' states: '$failedResources'"
        }
        Start-Sleep 1
        $caGroupState = (Get-ClusterGroup -Name $clusterGroupName -ErrorAction Stop).State
    }

    # Perform a final validation
    $caGroupState = (Get-ClusterGroup -Name $clusterGroupName -ErrorAction Stop).State
    if ($caGroupState -ne [Microsoft.FailoverClusters.PowerShell.ClusterGroupState]::Online)
    {
        $failedResources = [String]::Join(", ", (Get-ClusterGroup -Name $clusterGroupName -ErrorAction Stop | Get-ClusterResource -ErrorAction Stop | Where-Object { $_.State -ne [Microsoft.FailoverClusters.PowerShell.ClusterResourceState]::Online }).Name)
        Remove-ClusterGroup -Name $clusterGroupName -RemoveResources -Force -ErrorAction Stop
        throw "Failed to start the cloud agent generic service in failover cluster. The cluster resource group is in the '$caGroupState' state. Resources in 'failed' or 'pending' states: '$failedResources'"
    }
}

function Get-TargetCapiClusters
{
    <#
    .DESCRIPTION
        Returns all CapiCluster resources
    #>

    $tmpClusters = @()
    Get-CapiClusters | ForEach-Object {
        if ($null -eq $_.spec.management) {
            $tmpClusters += ($_)
        }
    }   
    return $tmpClusters
}

function Get-CapiClusters
{
    <#
    .DESCRIPTION
        Returns all AksHciCluster resources
    #>

    Write-Status $("Retrieving clusters") -moduleName $global:KvaModule

    $capiClusters = Invoke-Kubectl -arguments $("get akshciclusters -o json") | ConvertFrom-Json
    if ($null -eq $capiClusters)
    {
        throw $("No cluster information was found.")
    }

    $clusters = @()
    foreach($capiCluster in $capiClusters.items)
    {
        $clusters += Get-CapiCluster -Name $capiCluster.metadata.name
    }

    return $clusters
}

function Get-CapiCluster
{
    <#
    .DESCRIPTION
        Returns the requested CapiCluster resource

    .PARAMETER Name
        Name of the cluster
    #>

    param (
        [Parameter()]
        [String]$Name
    )

    Write-Status $("Retrieving configuration for workload cluster '$Name'") -moduleName $global:KvaModule

    $capiCluster = Invoke-Kubectl -ignoreError -arguments $("get akshciclusters/$Name -o json") | ConvertFrom-Json
    if ($null -eq $capiCluster)
    {
        throw $("A workload cluster with the name '$Name' was not found.")
    }

    $defaultLinuxNodepoolName = GetDefaultLinuxNodepoolName -clusterName $Name
    $defaultWindowsNodepoolName = GetDefaultWindowsNodepoolName -clusterName $Name
    

    $linuxNodepool = Invoke-Kubectl -ignoreError -arguments $("get akshcinodepools/$defaultLinuxNodepoolName -o json") | ConvertFrom-Json
    if ($null -eq $linuxNodepool)
    {
        Write-SubStatus "A workload nodepool with the name '$defaultLinuxNodepoolName' was not found." -moduleName $global:KvaModule
    }

    $windowsNodepool = Invoke-Kubectl -ignoreError -arguments $("get akshcinodepools/$defaultWindowsNodepoolName -o json") | ConvertFrom-Json
    if ($null -eq $windowsNodepool)
    {
        Write-SubStatus "A workload cluster with the name '$defaultWindowsNodepoolName' was not found." -moduleName $global:KvaModule
    }

    Write-SubStatus "Successfully retrieved cluster information." -moduleName $global:KvaModule

    $cniConfig = $capiCluster.spec.clusterConfiguration.cniConfiguration.configuration
    $primaryNetworkPlugin = [NetworkPlugin]::Default

    if (-Not [string]::IsNullOrWhiteSpace($cniConfig))
    {
        if ($cniConfig.Contains(':'))
        {
            $primaryNetworkPlugin = $cniConfig.Substring(0, $cniConfig.IndexOf(':')) # only keep the cni name, remove the version
        }
        else 
        {
            $primaryNetworkPlugin = $cniConfig    
        }
    }

    
    # For ease, calculate linux and windows replica counts + VmSizes and append them as a member of the returned object
    $linuxWorkerReplicas = 0
    $linuxWorkerVmSize = [VmSize]::Default

    if ($null -ne $linuxNodepool)
    {
        $linuxWorkerReplicas = $linuxNodepool.spec.replicas
        $linuxWorkerVmSize = [Enum]::Parse([VmSize], $($linuxNodepool.spec.infrastructureProfile.hardwareProfile.vmsize), $true)    
    }

    $windowsWorkerReplicas = 0
    $windowsWorkerVmSize = [VmSize]::Default

    if ($null -ne $windowsNodepool)
    {
        $windowsWorkerReplicas = $windowsNodepool.spec.replicas
        $windowsWorkerVmSize = [Enum]::Parse([VmSize], $($windowsNodepool.spec.infrastructureProfile.hardwareProfile.vmsize), $true)
    }
    
    $capiCluster | Add-Member -NotePropertyName linuxWorkerReplicas -NotePropertyValue $linuxWorkerReplicas
    $capiCluster | Add-Member -NotePropertyName linuxWorkerVmSize -NotePropertyValue $linuxWorkerVmSize
    $capiCluster | Add-Member -NotePropertyName windowsWorkerReplicas -NotePropertyValue $windowsWorkerReplicas
    $capiCluster | Add-Member -NotePropertyName windowsWorkerVmSize -NotePropertyValue $windowsWorkerVmSize
    $capiCluster | Add-Member -NotePropertyName primaryNetworkPlugin -NotePropertyValue $primaryNetworkPlugin

    return $capiCluster
}

#region Logging and Monitoring

#region Cleanup Functions

function Install-Binaries
{
    <#
    .DESCRIPTION
        Copies AksHci binaries to a node

    .PARAMETER nodeName
        The node to execute on.
    .PARAMETER module
        The module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$nodeName,
        [Parameter(Mandatory=$true)]
        [String]$module,
        [Parameter(Mandatory=$true)]
        [Hashtable] $binariesMap
    )

    Write-Status "Installing $module binaries on Node $nodeName" -moduleName $module

    Invoke-Command -ComputerName $nodeName -ScriptBlock {
        $path = $args[0]

        New-Item -ItemType Directory -Force -Path $path
        
        $envPath = [Environment]::GetEnvironmentVariable("PATH")
        if($envPath -notlike $("*$path*"))
        {
            [Environment]::SetEnvironmentVariable("PATH", "$envPath;$path")
            [Environment]::SetEnvironmentVariable("PATH", "$envPath;$path", "Machine")
        }
    } -ArgumentList $global:installDirectory | out-null

    $binariesMap.Keys | foreach-object {
        Copy-FileToRemoteNode -source $([io.Path]::Combine($global:config[$module]["installationPackageDir"], $_)) -remoteNode $nodeName -destination $binariesMap[$_]
    }
}

function Uninstall-Binaries
{
    <#
    .DESCRIPTION
        Copies AksHci binaries to a node

    .PARAMETER nodeName
        The node to execute on.
    .PARAMETER module
        The module
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$nodeName,
        [Parameter(Mandatory=$true)]
        [String]$module,
        [Parameter(Mandatory=$true)]
        [Hashtable] $binariesMap
    )

    Write-Status "Uninstalling $module binaries on Node $nodeName" -moduleName $module

    Invoke-Command -ComputerName $nodeName -ScriptBlock {
        $binaries = $args[0]

        $binaries.Keys | Foreach-Object {
            Remove-Item -Path $binaries[$_] -force -ErrorAction SilentlyContinue
        }
    } -ArgumentList $binariesMap | out-null
}

#endregion

#region Catalog helpers

function Get-Catalog
{
    <#
    .DESCRIPTION
        Get the Catalog for AksHci. This would include a set of product release versions
        
    .PARAMETER moduleName
        Module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$moduleName
    )

    $cacheFile = $global:config[$moduleName]["manifestCache"]
    if ((Test-Path $cacheFile)) {
        return (Get-Content $cacheFile | ConvertFrom-Json)
    }

    $provider = Get-DownloadProvider -module $moduleName

    $downloadParams = @{
        Name = $global:config[$moduleName]["catalog"]
        Audience = $global:config[$moduleName]["ring"]
        Provider = $provider
    }

    if ($global:config[$moduleName]["useStagingShare"])
    {
        $downloadParams.Add("Endpoint", $global:config[$moduleName]["stagingShare"])
    }

    $catalog = Get-DownloadSdkCatalog @downloadParams

    $cacheFile = $global:config[$moduleName]["manifestCache"]
    $catalogJson = $catalog | ConvertTo-Json -depth 100
    Set-Content -path $cacheFile -value $catalogJson -encoding UTF8
    return $catalog
}

function Get-LatestCatalog
{
    <#
    .DESCRIPTION
        Get the latest catalog for AksHci by clearing the cache and redownloading the latest

    .PARAMETER moduleName
        Module name
    #>
    
    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    # Clean the catalog cache, so we download the latest
    Clear-CatalogCache -moduleName $moduleName

    return Get-Catalog -moduleName $moduleName
}

function Clear-CatalogCache
{
    <#
    .DESCRIPTION
        Removes any cached copy of the catalog
        
    .PARAMETER moduleName
        Module name
    #>

    $cacheFile = $global:config[$moduleName]["manifestCache"]
    if ((Test-Path $cacheFile)) {
        Remove-Item $cacheFile -Force
    }
    # Sometimes this path wouldnt exist. Try to initialize it here
    $dirPath = [io.Path]::GetDirectoryName($cacheFile)
    if (!(Test-Path $dirPath)) {
        New-Item -ItemType Directory -force -Path $dirPath
    }
}

function Get-ProductRelease
{
    <#
    .DESCRIPTION
        Gets the Product Release manifest for the specified Version

    .PARAMETER version
        The requested release version

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $version,

        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $catalog = Get-Catalog -moduleName $moduleName
    foreach($productRelease in $catalog.ProductStreamRefs[0].ProductReleases)
    {
        if ($productRelease.Version -ieq $version)
        {
            return $productRelease
        }
    }

    throw "A release with version $version was NOT FOUND"
}

function Get-ProductReleasesUptoVersion
{
    <#
    .DESCRIPTION
        Get all of the Product Release Manifests up to the specified Version

    .PARAMETER version
        Requested version
    #>
    param (
        [String]$version,

        [Parameter(Mandatory=$true)]
        [String]$moduleName
    )

    # Assumption here is that the ordering of values in catalog release stream is latest at top.
    $releaseList = @()
    $catalog = Get-Catalog -moduleName $moduleName
    foreach($productRelease in $catalog.ProductStreamRefs[0].ProductReleases)
    {
        $releaseList += $productRelease
        if ($productRelease.Version -ieq $version)
        {
            break
        }
    }

    if ($releaseList.Count -eq 0) {
        throw "$version is NOT FOUND"
    }

    return $releaseList
}

function Get-LatestRelease
{
    <#
    .DESCRIPTION
        Get the latest release of AksHci by refreshing the catalog and returning the latest release
        from the updated catalog

    .PARAMETER moduleName
        Module name
    #>
    
    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $catalog = Get-LatestCatalog -moduleName $moduleName
    if (-not $catalog)
    {
        throw $("The latest release catalog could not be retrieved at this time. Please retry later")
    }

    return $catalog.ProductStreamRefs[0].ProductReleases[0]
}

function Get-ReleaseDownloadParameters
{
    <#
    .DESCRIPTION

    .PARAMETER name
        Release name to be downloaded

    .PARAMETER version
        Release version to be downloaded

    .PARAMETER destination
        The destination for the download

    .PARAMETER parts
        How many download parts to use (concurrency)

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $name,

        [Parameter(Mandatory=$true)]
        [String] $version,

        [Parameter()]
        [String] $destination,

        [Parameter()]
        [Int] $parts = 1,

        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $provider = Get-DownloadProvider -module $moduleName

    $downloadParams = @{
        Provider = $provider
        Name = $name
        Version = $version
        Destination = $destination
        Parts = $parts
    }

    if ($global:config[$moduleName]["useStagingShare"])
    {
        $downloadParams.Add("Endpoint", $global:config[$moduleName]["stagingShare"])
        $downloadParams.Add("CatalogName", $global:config[$moduleName]["catalog"])
        $downloadParams.Add("Audience", $global:config[$moduleName]["ring"])
    }

    return $downloadParams
}

function Get-DownloadProvider
{
    <#
    .DESCRIPTION
        Returns an appropriate download provider based on the current module configuration
        
    .PARAMETER moduleName
        Module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String]$moduleName
    )

    if ($global:config[$moduleName]["useStagingShare"])
    {
        $endpoint = $($global:config[$moduleName]["stagingShare"])
        if ($endpoint.StartsWith("http"))
        {
            return "http"
        }
        elseif ($endpoint.StartsWith("//") -or $endpoint.StartsWith("\\") -or $endpoint.Contains(":"))
        {
            return "local"
        }
        else
        {
            throw "Unsupported staging share endpoint: $endpoint"
        }
    }

    return "sfs"
}

function Get-TargetClusterKubernetesVersions
{
    <#
    .DESCRIPTION
        Get the Kubernetes Versions used for the target clusters
    
    .PARAMETER Version
        Version
    #>
    try {
        $tmp = Get-TargetClusterKubernetesReferences
        return $tmp.Keys
    } catch {
        # Workaround
        return @()
    }
}

function Get-TargetClusterKubernetesReferences
{
    <#
    .DESCRIPTION
        Get the Kubernetes Versions used for the target clusters
    #>

    $k8sversionsInUse = @{}
    Get-TargetCapiClusters | ForEach-Object {
        $tmp = $_
        $k8sversion = $tmp.spec.clusterConfiguration.kubernetesVersion
        if (!$k8sversionsInUse.ContainsKey($k8sversion))
        {
            $k8sversionsInUse += @{$k8sversion = @();}
        }
        # Add references to the target cluster name
        $k8sversionsInUse[$k8sversion] += ($tmp.metadata.Name)
    }
    return $k8sversionsInUse
}

#endregion

#region File download helpers

function Test-AuthenticodeBinaries
{
    <#
    .DESCRIPTION
        Validates binary integrity via authenticode

    .PARAMETER workingDir
        Location of the binaries to be tested

    .PARAMETER binaries
        The list of binaries to be tested
    #>
    param (
        [Parameter(Mandatory=$true)]
        [string] $workingDir,

        [Parameter(Mandatory=$true)]
        [string[]] $binaries
    )

    Write-Status "Verifying Authenticode binaries" -moduleName $global:DownloadModule

    $workingDir = $workingDir -replace "\/", "\"
    foreach ($binary in $binaries)
    {
        $name = $("$workingDir/$binary") -replace "\/", "\"
        Write-SubStatus $("Checking signature for binary: $name") -moduleName $global:DownloadModule

        $auth = Get-AuthenticodeSignature -FilePath $name
        if (($global:expectedAuthResponse.status -ne $auth.status) -or ($global:expectedAuthResponse.SignatureType -ne $auth.SignatureType))
        {
            throw $("Binary $name failed authenticode verification. Expected status=$($global:expectedAuthResponse.status) and type=$($global:expectedAuthResponse.SignatureType) but received status=$($auth.status) and type=$($auth.SignatureType)")
        }

        Write-SubStatus "Verified Signature for $name" -moduleName $global:DownloadModule
    }
}

#endregion

#region EventLog

function New-ModuleEventLog
{
    <#
    .DESCRIPTION
        Tests if the desired product/module is installed (or installing). Note that we consider some
        failed states (e.g. UninstallFailed) to represent that the product is still installed, albeit
        in a unknown/failed state.

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )
            
    New-EventLog -LogName "AKSHCI" -Source $moduleName -ErrorAction Ignore
}

function Write-ModuleEventLog
{
    <#
    .DESCRIPTION
        Tests if the desired product/module is installed (or installing). Note that we consider some
        failed states (e.g. UninstallFailed) to represent that the product is still installed, albeit
        in a unknown/failed state.

    .PARAMETER moduleName
        The module name to test for installation state

    .PARAMETER message
        The message that has to be logged

    .PARAMETER activity
        Activity name to use when writing progress
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName,

        [Parameter(Mandatory=$true)]
        [String] $message,

        [Parameter(Mandatory=$true)]
        [System.Diagnostics.EventLogEntryType] $entryType,
    
        [Parameter(Mandatory=$true)]
        [int] $eventId
    )
    $start = 0
    $end = 32760
    $tmpMessage = $message

    # Try to trim down the message if its too big
    if ($message.Length -gt $end)
    {
        $tmpMessage = $message.Substring($start, $end)
    }

    Write-EventLog -LogName "AKSHCI" -Source $moduleName -EventID $eventId -EntryType $entryType -Message $tmpMessage
}

#endregion

#region Validation functions

function Test-ValidCIDR
{
    <#
    .DESCRIPTION
        This function validates that CIDR is valid by checking:
        1. That the CIDR notation is correct (IP/prefix)
        2. That the IP is valid.
        3. That the prefix length is between 1 and 30

    .PARAMETER CIDR
        The CIDR in the form IP/prefixlength. E.g. 10.0.0.0/24
    #>
    param (
        [Parameter(Mandatory=$true)]
        [string] $CIDR
    )

    $x = $CIDR.Split('/')
    if ($x.Length -ne 2) {
        throw "Invalid CIDR ($CIDR). CIDR should be of the form 10.0.0.0/24."
    }
    $ip = $x[0]
    $prefix = [int]::Parse($x[1])

    Test-ValidEndpoint -endpoint $ip

    # The minimum prefix length is /30 (which leaves 2 usable ip addresses. 1 for mgmt cluster VM, 1 for mgmt k8s VIP)
    if (($prefix -lt 1) -or ($prefix -gt 30)) {
        throw "Invalid prefix length ($prefix). The prefix must be between 1 and 30."
    }
}

function Test-ValidPool
{
    <#
    .DESCRIPTION
        This function validates that the pool start/end are valid by checking:
        1. That the pool start/end are valid ip addresses
        2. That the pool end comes after or is equal (1 IP) to the pool start.
        3. If CIDR is also given, it validates the range is within the CIDR.

    .PARAMETER PoolStart
        The starting ip address of the pool

    .PARAMETER PoolEnd
        The ending ip address of the pool

    .PARAMETER CIDR
        The CIDR from where the pool should come from.
        Note that if CIDR is given, it is expected to have already been validated.
    #>
    param (
        [Parameter(Mandatory=$true)]
        [string] $PoolStart,
        [Parameter(Mandatory=$true)]
        [string] $PoolEnd,
        [string] $CIDR
    )

    Test-ValidEndpoint -endpoint $PoolStart
    Test-ValidEndpoint -endpoint $PoolEnd

    $valid = [AKSHCI.IPUtilities]::ValidateRange($PoolStart, $PoolEnd)
    if (-not $valid) {
        throw "Invalid range $PoolStart - $PoolEnd"
    }
    if ($CIDR) {
        $valid = [AKSHCI.IPUtilities]::ValidateRangeInCIDR($PoolStart, $PoolEnd, $CIDR)
        if (-not $valid) {
            throw "Range $PoolStart - $PoolEnd is not in $CIDR"
        }    
    } 
}

#endregion

#region Proxy server functions

function Set-ProxyConfiguration
{
    <#
    .DESCRIPTION
        Sets the proxy server configuration for a module

    .PARAMETER proxySettings
        Proxy server settings

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter()]
        [ProxySettings] $proxySettings,

        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $http = ""
    $https = ""
    $noProxy = ""
    $certFile = ""
    $user = ""
    $pass = ""

    if ($proxySettings)
    {
        $http = $proxySettings.HTTP
        $https = $proxySettings.HTTPS
        $noProxy = $proxySettings.NoProxy
        $certFile = $proxySettings.CertFile

        Test-ProxyConfiguration -http $http -https $https -certFile $certFile

        if ($proxySettings.Credential.Username)
        {
            $user = $proxySettings.Credential.UserName
        }
        
        if ($proxySettings.Credential.Password)
        {
            $pass = $proxySettings.Credential.Password | ConvertFrom-SecureString -Key $global:credentialKey
        }
    }

    Set-ConfigurationValue -name "proxyServerUsername" -value $user -module $moduleName
    Set-ConfigurationValue -name "proxyServerPassword" -value $pass -module $moduleName
    Set-ConfigurationValue -name "proxyServerHTTP" -value $http -module $moduleName
    Set-ConfigurationValue -name "proxyServerHTTPS" -value $https -module $moduleName
    Set-ConfigurationValue -name "proxyServerNoProxy" -value $noProxy -module $moduleName
    Set-ConfigurationValue -name "proxyServerCertFile" -value $certFile -module $moduleName

    Initialize-ProxyEnvironment -moduleName $moduleName
}

function Initialize-ProxyEnvironment
{
    <#
    .DESCRIPTION
        Applies proxy settings to the current process environment

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $proxySettings = Get-ProxyConfiguration -moduleName $moduleName
    if ($proxySettings.HTTP -or $proxySettings.HTTPS)
    {
        Set-DownloadSdkProxy -Http "$($proxySettings.HTTP)" -Https "$($proxySettings.HTTPS)" -NoProxy "$($proxySettings.NoProxy)"
    }
}

function Get-ProxyConfiguration
{
    <#
    .DESCRIPTION
        Returns a custom PSObject containing the complete HTTP, HTTPS, NoProxy, and CertFile setting strings

    .PARAMETER moduleName
        The module name
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $moduleName
    )

    $proxyHTTP = ""
    $proxyHTTPS = ""
    $proxyCertName = ""
    $proxyCertContentB64 = ""

    if ($global:config[$moduleName]["proxyServerHTTP"])
    {
        $proxyHTTP = Get-ProxyWithCredentials -proxyServer $($global:config[$moduleName]["proxyServerHTTP"]) -proxyUsername $($global:config[$moduleName]["proxyServerUsername"]) -proxyPass $($global:config[$moduleName]["ProxyServerPassword"])
    }

    if ($global:config[$moduleName]["proxyServerHTTPS"])
    {
        $proxyHTTPS = Get-ProxyWithCredentials -proxyServer $($global:config[$moduleName]["proxyServerHTTPS"]) -proxyUsername $($global:config[$moduleName]["proxyServerUsername"]) -proxyPass $($global:config[$moduleName]["ProxyServerPassword"])
    }

    if (($global:config[$moduleName]["proxyServerCertFile"]) -and (Test-Path $global:config[$moduleName]["proxyServerCertFile"]))
    {
        $content = Get-Content -Encoding Byte -Path $global:config[$moduleName]["proxyServerCertFile"]
        if ($content)
        {
            $proxyCertName = "proxy-cert.crt"
            $proxyCertContentB64 = [Convert]::ToBase64String($content)
        }
    }

    $proxyConfig = [ordered]@{
        'HTTP' = $proxyHTTP;
        'HTTPS' = $proxyHTTPS;
        'NoProxy' = $global:config[$moduleName]["proxyServerNoProxy"];
        'CertPath' = $global:config[$moduleName]["proxyServerCertFile"];
        'CertName' = $proxyCertName; 
        'CertContent' = $proxyCertContentB64
    }

    if ($($global:config[$moduleName]["proxyServerUsername"]) -and $($global:config[$moduleName]["ProxyServerPassword"]))
    {
        $securePass = $($global:config[$moduleName]["ProxyServerPassword"]) | ConvertTo-SecureString -Key $global:credentialKey
        $credential = New-Object System.Management.Automation.PSCredential -ArgumentList $($global:config[$moduleName]["proxyServerUsername"]), $securePass

        $proxyConfig.Add("Credential", $credential)
    }

    $result = @()
    $result += New-Object -TypeName PsObject -Property $proxyConfig

    return $result
}

function Get-ProxyWithCredentials
{
    <#
    .DESCRIPTION
        Returns a complete proxy string with credentials in the URI format (e.g. http://user:pass@server.com:8080)

    .PARAMETER proxyServer
        Proxy server string URI

    .PARAMETER proxyUsername
        Proxy server username

    .PARAMETER proxyPass
        Proxy server password (this is a secure string representation, not plaintext)
    #>

    param (
        [Parameter(Mandatory=$true)]
        [String] $proxyServer,

        [Parameter()]
        [String] $proxyUsername,

        [Parameter()]
        [String] $proxyPass
    )

    $uri = Test-ValidProxyServer -proxyServer $proxyServer
    $proxyString = $($uri.Scheme + "://")

    if ($proxyUsername -and $proxyPass)
    {
        $securePass = $proxyPass | ConvertTo-SecureString -Key $global:credentialKey
        $credential = New-Object System.Management.Automation.PSCredential -ArgumentList $proxyUsername, $securePass
        $proxyString += $($credential.UserName + ":" + $credential.GetNetworkCredential().Password + "@")
    }

    $proxyString += $uri.Authority

    return $proxyString    
}

function Test-ProxyConfiguration
{
    <#
    .DESCRIPTION
        Validates the provided proxy server configuration. On failure, would throw.

    .PARAMETER http
        HTTP proxy server configuration

    .PARAMETER https
        HTTPS proxy server configuration

    .PARAMETER certFile
        Path to a CA certificate file used to establish trust with a HTTPS proxy server
    #>

    param (
        [Parameter()]
        [String] $http,

        [Parameter()]
        [String] $https,

        [Parameter()]
        [String] $certFile
    )

    if ($http)
    {
        Test-ValidProxyServer -proxyServer $http | Out-Null
    }

    if ($https)
    {
        Test-ValidProxyServer -proxyServer $https | Out-Null
    }

    if ($certFile)
    {
        if (-not (Test-Path $certFile))
        {
            throw $("The proxy server certificate file '$certFile' was not found")
        }
    }
}

function Test-ValidProxyServer
{
    <#
    .DESCRIPTION
        Validates the provided proxy server string
 
    .PARAMETER proxyServer
        Proxy server string in absolute URI format (e.g. http://proxy.com:3128)
    #>

    param (
        [String] $proxyServer
    )

    $uri = $null
    $result = [System.URI]::TryCreate($proxyServer, [System.UriKind]::Absolute, [ref]$uri)
    if (-not $result)
    {
        throw $("The proxy server string '" + $proxyServer + "' is not a valid absolute URI (e.g. http://server.com:8080)")
    }

    switch($uri.Scheme)
    {
        $([System.URI]::UriSchemeHttp) {
            break
        }
        $([System.URI]::UriSchemeHttps) {
            break
        }
        Default {
            throw $("The proxy server string '" + $proxyServer + "' does not use a support URI scheme (e.g. http or https)")
        }
    }

    return $uri
}


#endregion

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