Debugging Methods in Class Based DSC Resource

DSC
1

Hi all ,

I’m trying to build some class based DSC Resource using the latest release of PowerShell 5 April Preview .

I’m wondering how do you Debug methods inside the class ?? With functions I can specified parameters and see the output and set Breakpoints or “Write-Debug” .

So my question is how do I get inside the methods or how do I test those methods with different parameters .

This is an example :

enum Ensure {

Absent
Present

}

[DscResource()]
class ClassService {

[DscProperty(Key)]
[string]$serviceName

[DscProperty(Mandatory)]
[Ensure] $Ensure

[DscProperty(Mandatory)]
[string] $Servicestatus


[ClassService] Get() {

$serviceExists = Get-Service -Name bits -ErrorAction SilentlyContinue

If ($ServiceExists.status -eq $this.ServiceStatus) {
        Write-Verbose "Service status is correct"
       
    }Else {
        write-Verbose "Service status is not correct"
        
    }
return $this

#$returnValue = @{
#	ServiceName = [System.String]$this.ServiceName
#	Servicestatus = [System.String]$serviceExists.Status
#	Ensure = [System.String]$this.Ensure
#}
#return $returnValue

}

[void] Set() {
    
    Write-verbose "Changing service status"

    If ($this.serviceStatus -eq "Running") {
        Start-Service -name $this.serviceName
    }Else {
        Stop-Service -name $this.ServiceName
    }

}

[bool] Test() {
    $serviceExists = Get-Service -Name $this.ServiceName -ErrorAction SilentlyContinue

    if ($this.Ensure -eq 'Present') {   
        if($serviceExists -ne $null)
        {
            If ($serviceExists.status -eq $this.ServiceStatus) {
                Write-Verbose "Nothing to configure - Service exists and has correct status"
                Return $True
            }Else {
                Write-Verbose "Need to configure - Status is not correct"
                Return $False
            }
        } else {
            Write-Verbose "Nothing to configure - Service name does not exist"
            return $false
        }
    } Else {
        Write-Verbose "Nothing to configure - Ensure is Absent"
        return $False
    }


}

}

Regards

Mariusz

2

Hi Mariusz,

Just create an object instance of your class, set the member fields with test values and invoke the Get, Test and/or Set functions. You can set breakpoints as usual inside your class code.

$VerbosePreference = 'Continue'

# Instantiate an object of the class
$MyServiceObjcet = [ClassService]::new()

# Set member fields of the class
$MyServiceObjcet.Ensure = 'Present'
$MyServiceObjcet.serviceName = 'Browser'
$MyServiceObjcet.Servicestatus = 'Stopped'

# Invoke the functions
$MyServiceObjcet.Get()
$MyServiceObjcet.Test()

Regards
Daniel

3

HI Daniel ,

Thanks for help .

Regards

Mariusz