invoke-AppPoolSetting.ps1

# Function which allows for quick set/get of app pool property - make sure you have the newest one :)
# available @  https://gist.github.com/RafPe/77d2ff28f7a0014bf0f1
function Invoke-AppPoolSetting
{

    <#
        .SYNOPSIS
        Gets or sets application pool setting

        .PARAMETER appPoolName
        Defines which application pool we are working with (name is the unique key). By not specyfing this fields we get 
        automatically default app pool selected

        .PARAMETER propertyName
        This is property we are interested with

        .PARAMETER action
        Defines action which we want to take against property. Possible values are 'get','set'

        .PARAMETER value
        Defines value which should be applied to property (applicable only if action is set )

        .DESCRIPTION
        This single line command allows for setting or getting parameter value for choosen application pool.

        .EXAMPLE 
        Invoke-AppPoolSetting -propertyName queueLength -action get;

        .EXAMPLE 
        Invoke-AppPoolSetting -propertyName queueLength -action set -value 1234



    #>

    param
    (    
        [string]$appPoolName,
        [Parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        $propertyName,
        [Parameter(Mandatory=$true)]
        [ValidateSet('get','set')]
        [string]$action,
        $value                
    )

    #Mapping of namespace (works on IIS 8.5)
    $NamespaceMapping = @{
       name                        = 'system.applicationHost/applicationPools/{0}'
       queueLength                 = 'system.applicationHost/applicationPools/{0}';
       autoStart                   = 'system.applicationHost/applicationPools/{0}';
       enable32BitAppOnWin64       = 'system.applicationHost/applicationPools/{0}';
       managedRuntimeVersion       = 'system.applicationHost/applicationPools/{0}';
       managedRuntimeLoader        = 'system.applicationHost/applicationPools/{0}';
       enableConfigurationOverride = 'system.applicationHost/applicationPools/{0}';
       managedPipelineMode         = 'system.applicationHost/applicationPools/{0}';
       CLRConfigFile               = 'system.applicationHost/applicationPools/{0}';
       passAnonymousToken          = 'system.applicationHost/applicationPools/{0}';
       startMode                   = 'system.applicationHost/applicationPools/{0}';
       identityType          = 'system.applicationHost/applicationPools/{0}/processModel';
       userName              = 'system.applicationHost/applicationPools/{0}/processModel';
       password              = 'system.applicationHost/applicationPools/{0}/processModel';
       loadUserProfile       = 'system.applicationHost/applicationPools/{0}/processModel';
       setProfileEnvironment = 'system.applicationHost/applicationPools/{0}/processModel';
       logonType             = 'system.applicationHost/applicationPools/{0}/processModel';
       manualGroupMembership = 'system.applicationHost/applicationPools/{0}/processModel';
       idleTimeout           = 'system.applicationHost/applicationPools/{0}/processModel';
       idleTimeoutAction     = 'system.applicationHost/applicationPools/{0}/processModel';
       maxProcesses          = 'system.applicationHost/applicationPools/{0}/processModel';
       shutdownTimeLimit     = 'system.applicationHost/applicationPools/{0}/processModel';
       startupTimeLimit      = 'system.applicationHost/applicationPools/{0}/processModel';
       pingingEnabled        = 'system.applicationHost/applicationPools/{0}/processModel';
       pingInterval          = 'system.applicationHost/applicationPools/{0}/processModel';
       pingResponseTime      = 'system.applicationHost/applicationPools/{0}/processModel';
       disallowOverlappingRotation    = 'system.applicationHost/applicationPools/{0}/recycling';
       disallowRotationOnConfigChange = 'system.applicationHost/applicationPools/{0}/recycling';
       logEventOnRecycle              = 'system.applicationHost/applicationPools/{0}/recycling';
       memory                         = 'system.applicationHost/applicationPools/{0}/recycling/periodicRestart';
       privateMemory                  = 'system.applicationHost/applicationPools/{0}/recycling/periodicRestart';
       requests                       = 'system.applicationHost/applicationPools/{0}/recycling/periodicRestart';
       time                           = 'system.applicationHost/applicationPools/{0}/recycling/periodicRestart';
       schedule                       = 'system.applicationHost/applicationPools/{0}/recycling/periodicRestart/schedule';
       loadBalancerCapabilities      = 'system.applicationHost/applicationPools/{0}/failure';
       orphanWorkerProcess           = 'system.applicationHost/applicationPools/{0}/failure';
       orphanActionExe               = 'system.applicationHost/applicationPools/{0}/failure';
       orphanActionParams            = 'system.applicationHost/applicationPools/{0}/failure';
       rapidFailProtection           = 'system.applicationHost/applicationPools/{0}/failure';
       rapidFailProtectionInterval   = 'system.applicationHost/applicationPools/{0}/failure';
       rapidFailProtectionMaxCrashes = 'system.applicationHost/applicationPools/{0}/failure';
       autoShutdownExe               = 'system.applicationHost/applicationPools/{0}/failure';
       autoShutdownParams            = 'system.applicationHost/applicationPools/{0}/failure';
       limit                     = 'system.applicationHost/applicationPools/{0}/cpu';
       action                    = 'system.applicationHost/applicationPools/{0}/cpu';
       resetInterval             = 'system.applicationHost/applicationPools/{0}/cpu';
       smpAffinitized            = 'system.applicationHost/applicationPools/{0}/cpu';
       smpProcessorAffinityMask  = 'system.applicationHost/applicationPools/{0}/cpu';
       smpProcessorAffinityMask2 = 'system.applicationHost/applicationPools/{0}/cpu';
       processorGroup            = 'system.applicationHost/applicationPools/{0}/cpu';
       numaNodeAssignment        = 'system.applicationHost/applicationPools/{0}/cpu';
       numaNodeAffinityMode      = 'system.applicationHost/applicationPools/{0}/cpu';
    }

    # Create target app pool name 
    if( [string]::IsNullOrEmpty($appPoolName) -or $appPoolName -eq 'applicationPoolDefaults' ) { $targetAppName = 'applicationPoolDefaults' } else { $targetAppName = [string]::Format("add[@name='{0}']",$appPoolName ) }
    
    switch ($action)
    {
      'get'        { 

                        Write-Debug "using $targetAppName as target name"
                        # gets value
                        
                        try
                        {
                          Write-Debug "Requesting property $propertyName value for appPool $appPoolName"
                          $res =  (Get-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST'  -filter $( $NamespaceMapping[ $propertyName ] -f $targetAppName ) -name $propertyName)
                            
                          Write-Debug "property is type of $($res.GetType().Name)"

                          #We need to distinguish from simple value type to complex value types
                          if ( $res.GetType().Name -eq 'ConfigurationAttribute')
                          {

                            return $res.Value.ToString()
                          }
                          else
                          {

                           
                            return $res.ToString()
                          }

                        }
                        catch
                        {
                            Throw "Could not retrieve property $propertyName for appPool $Name"
                        }
                        
                        
                   }
      
      'set'        { 
                       
                       if($null -eq $value)
                       {
                            Throw 'Please ensure that value is specified for set and is not NULL'
                       }

                        try
                        {
                          Write-Debug "Setting  property $propertyName with value $value for appPool $Name"
                          Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST'  -filter $( $NamespaceMapping[ $propertyName ] -f $targetAppName ) -name $propertyName -Value $value
                        
                        }
                        catch
                        {
                            Throw "Could not set property $propertyName with value $value for appPool $Name"
                        }

                       

                   }
    }
}