Get-Subscription.ps1

function Get-Subscription {
<#
    .SYNOPSIS
    This script can be used to get a subscription from a topic.
             
    .DESCRIPTION
    This script can be used to get a subscription from a topic.
 
    .PARAMETER TopicPath
    Specifies the path of the topic that this subscription description belongs to.
     
    .PARAMETER Name
    Specifies the name of the subscription.
 
    .PARAMETER Namespace
    Specifies the name of the Service Bus namespace.
 
#>


[CmdletBinding(PositionalBinding=$True)]
Param(
    [Parameter(Mandatory = $true)]
    [String]$TopicPath,                 # required needs to be alphanumeric
    [Parameter(Mandatory = $true)]
    [String]$Name,                      # required needs to be alphanumeric
    [ValidatePattern("^[a-z0-9]*$")]
    [alias("NamespaceName")]
    [String]$Namespace = (Get-Variable -Name $MyInvocation.MyCommand.Module.PrivateData.MODULEVAR -ValueOnly).DefaultNameSpace
    )
    
BEGIN 
{
    $datBegin = [datetime]::Now;
    [string] $fn = $MyInvocation.MyCommand.Name;
    
    $PSDefaultParameterValues.'Log-Debug:fn' = $fn;
    $PSDefaultParameterValues.'Log-Debug:fac' = 0;
    $PSDefaultParameterValues.'Log-Info:fn' = $fn;
    $PSDefaultParameterValues.'Log-Error:fn' = $fn;

}
# BEGIN

PROCESS 
{

# Default test variable for checking function response codes.
[Boolean] $fReturn = $false;
# Return values are always and only returned via OutputParameter.
$OutputParameter = $null;

try 
{
    # Parameter validation
    if(!$PSCmdlet.ShouldProcess(($PSBoundParameters | Out-String)))
    {
        throw($gotoSuccess);
    }
    
    # Set the output level to verbose and make the script stop on error
    $VerbosePreference = "Continue";
    $ErrorActionPreference = "Stop";

    # Create Service Bus namespace
    $CurrentNamespace = Get-SBNamespace -Name $Namespace;

    # Check if the namespace already exists or needs to be created
    if ($CurrentNamespace)
    {
        Log-Debug -msg "The namespace [$Namespace] already exists.";
    }
    else
    {
        Log-Debug -msg "The [$Namespace] namespace does not exist.";
        Log-Debug -msg "Creating the [$Namespace] namespace...";
        New-SBNamespace -Name $Namespace;
        $CurrentNamespace = Get-SBNamespace -Name $Namespace;
        Log-Debug -msg "The [$Namespace] namespace has been successfully created.";
    }

    # Get namespace connections string
    $ConnectionString = Get-SBClientConfiguration -Namespaces $Namespace;
    Log-Debug -msg "ConnectionString of [$Namespace] namespace: [$ConnectionString]";

    # Create the NamespaceManager object to create the subscription
    Log-Debug -msg "Creating a NamespaceManager object for the [$Namespace] namespace..."
    $NamespaceManager = [Microsoft.ServiceBus.NamespaceManager]::CreateFromConnectionString($ConnectionString);
    Log-Debug -msg "NamespaceManager object for the [$Namespace] namespace has been successfully created.";

    # Check if the topic exists
    if (!$NamespaceManager.TopicExists($TopicPath))
    {
        Log-Error -msg "The [$TopicPath] topic does not exit in the [$Namespace] namespace.";
        throw($gotoSuccess);
    }

    # Check if the subscription exists
    if (!$NamespaceManager.SubscriptionExists($TopicPath, $Name))
    {
        $msg = "A [$Name] subscription for the [$TopicPath] topic not exists in the [$Namespace] namespace.";
        $e = New-CustomErrorRecord -m $msg -cat InvalidData -o $NamespaceManager;
        Log-Error -msg $msg;
        $PSCmdlet.ThrowTerminatingError($e);
    }
    else
    {
        # Get subscription
        $OutputParameter = $NamespaceManager.GetSubscription($TopicPath, $Name);
    }

    $fReturn = $true;

}
catch 
{
    if($gotoSuccess -eq $_.Exception.Message) 
    {
        $fReturn = $true;
    } 
    else 
    {
        [string] $ErrorText = "catch [$($_.FullyQualifiedErrorId)]";
        $ErrorText += (($_ | fl * -Force) | Out-String);
        $ErrorText += (($_.Exception | fl * -Force) | Out-String);
        $ErrorText += (Get-PSCallStack | Out-String);
        
        if($_.Exception -is [System.Net.WebException]) 
        {
            Log-Critical $fn ("[WebException] Request FAILED with Status '{0}'. [{1}]." -f $_.Exception.Status, $_);
            Log-Debug $fn $ErrorText -fac 3;
        }
        else 
        {
            Log-Error $fn $ErrorText -fac 3;
            if($gotoError -eq $_.Exception.Message) 
            {
                Log-Error $fn $e.Exception.Message;
                $PSCmdlet.ThrowTerminatingError($e);
            } 
            elseif($gotoFailure -ne $_.Exception.Message) 
            { 
                Write-Verbose ("$fn`n$ErrorText"); 
            } 
            else 
            {
                # N/A
            }
        }
        $fReturn = $false;
        $OutputParameter = $null;
    }
}
finally 
{
    # Clean up
    # N/A
}

}
# PROCESS

END 
{

$datEnd = [datetime]::Now;
Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;

# Return values are always and only returned via OutputParameter.
return $OutputParameter;

}
# END

} # function

if($MyInvocation.ScriptName) { Export-ModuleMember -function Get-Subscription; }
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