Public/Start-RSJob.ps1
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Function Start-RSJob { <# .SYNOPSIS Starts a background job using runspaces. .DESCRIPTION This will run a command in the background, leaving your console available to perform other tasks. This uses runspaces in runspacepools which allows for throttling of running jobs. As the jobs are finished, they will automatically dispose of each runspace and allow other runspace jobs in queue to begin based on the throttling of the runspacepool. This is available on PowerShell V3 and above. By doing this, you can use the $Using: variable to take variables in the local scope and apply those directly into the scriptblock of the background runspace job. .PARAMETER ScriptBlock The scriptblock that holds all of the commands which will be run in the background runspace. You must specify at least one Parameter in the Param() to account for the item that is being piped into Start-Job. .PARAMETER FilePath This is the path to a file containing code that will be run in the background runspace job. .PARAMETER InputObject The object being piped into Start-RSJob or applied via the parameter. .PARAMETER Name The name of a background runspace job .PARAMETER Batch Name of the batch of RSJobs that will be run .PARAMETER ArgumentList List of values that will be applied at the end of the argument list in the Param() statement. .PARAMETER Throttle Number of concurrent running runspace jobs which are allowed at a time. .PARAMETER ModulesToImport A collection of modules that will be imported into the background runspace job. .PARAMETER PSSnapinsToImport A collection of PSSnapins that will be imported into the background runspace job. .PARAMETER FunctionsToImport A collection of functions that will be imported for use with a background runspace job. .NOTES Name: Start-RSJob Author: Boe Prox .EXAMPLE Get-ChildItem -Directory | Start-RSjob -Name {$_.Name} -ScriptBlock { Param($Directory) Write-Verbose $_ $Sum = (Get-ChildItem $Directory.FullName -Recurse -Force -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum).Sum [pscustomobject]@{ Name = $Directory.Name SizeMB = ([math]::round(($Sum/1MB),2)) } } Id Name State HasMoreData HasErrors Command -- ---- ----- ----------- --------- ------- 11 .shsh Running False False ... 12 .ssh Running False False ... 13 Contacts Running False False ... 14 Desktop Running False False ... 15 Documents Running False False ... 16 Downloads Running False False ... 17 Favorites Running False False ... 18 Links Running False False ... 19 Music Running False False ... 20 OneDrive Running False False ... 21 Pictures Running False False ... 22 Saved Games Running False False ... 23 Searches Running False False ... 24 Videos Running False False ... Get-RSJob | Receive-RSJob Name SizeMB ---- ------ .shsh 0 .ssh 0 Contacts 0 Desktop 7.24 Documents 83.99 Downloads 10259.6 Favorites 0 Links 0 Music 16691.89 OneDrive 1485.24 Pictures 1734.91 Saved Games 0 Searches 0 Videos 17.19 Description ----------- Starts a background runspace job that looks at the total size of each folder. Using Get-RSJob | Recieve-RSJob shows the results when the State is Completed. .EXAMPLE $Test = 'test' $Something = 1..10 1..5|start-rsjob -Name {$_} -ScriptBlock { Param($Object) [pscustomobject]@{ Result=($Object*2) Test=$Using:Test Something=$Using:Something } } Id Name State HasMoreData HasErrors Command -- ---- ----- ----------- --------- ------- 76 1 Completed True False ... 77 2 Running False False ... 78 3 Running False False ... 79 4 Completed False False ... 80 5 Completed False False ... Get-RSjob | Receive-RSJob Result Test Something ------ ---- --------- 2 test {1, 2, 3, 4...} 4 test {1, 2, 3, 4...} 6 test {1, 2, 3, 4...} 8 test {1, 2, 3, 4...} 10 test {1, 2, 3, 4...} Description ----------- Shows an example of the $Using: variable being used in the scriptblock. .EXAMPLE $Test = 42 $AnotherTest = 7 $String = 'SomeString' $ProcName = 'powershell_ise' $ScriptBlock = { Param($y,$z) [pscustomobject] @{ Test = $y Proc = (Get-Process -Name $Using:ProcName) String = $Using:String AnotherTest = ($z+$_) PipedObject = $_ } } 1..5|Start-RSJob $ScriptBlock -ArgumentList $test, $anothertest Description ----------- Shows an example of the $Using: variable being used in the scriptblock as well as $_ and multiple -ArgumentList parameters. #> [OutputType('PoshRS.PowerShell.RSJob')] [cmdletbinding( DefaultParameterSetName = 'ScriptBlock' )] Param ( [parameter(Mandatory=$True,Position=0,ParameterSetName = 'ScriptBlock')] [ScriptBlock]$ScriptBlock, [parameter(Position=0,ParameterSetName = 'ScriptPath')] [string]$FilePath, [parameter(ValueFromPipeline=$True,ValueFromPipelineByPropertyName=$True)] [object]$InputObject, [parameter()] [object]$Name, [parameter()] [string]$Batch, [parameter()] $ArgumentList, [parameter()] [int]$Throttle = 5, [parameter()] [string[]]$ModulesToImport, [parameter()] [string[]]$PSSnapinsToImport, [parameter()] [string[]]$FunctionsToLoad ) Begin { If ($PSBoundParameters['Debug']) { $DebugPreference = 'Continue' } If ($PSBoundParameters.ContainsKey('Verbose')) { Write-Verbose "Displaying PSBoundParameters" $PSBoundParameters.GetEnumerator() | ForEach { Write-Verbose $_ } } If ($PSBoundParameters.ContainsKey('Name')) { If ($Name -isnot [scriptblock]) { $JobName = [scriptblock]::Create("Write-Output $Name") } Else { $JobName = [scriptblock]::Create( ($Name -replace '\$_','$Item')) } } Else { Write-Verbose "Creating default Job Name" $JobName = [scriptblock]::Create('Write-Output Job$($Id)') } $RunspacePoolID = [guid]::NewGuid().ToString() Write-Verbose "Creating runspacepool <$($RunspacePoolID)> with max threads: $Throttle" $InitialSessionState = [System.Management.Automation.Runspaces.InitialSessionState]::CreateDefault() If ($PSBoundParameters['ModulesToImport']) { [void]$InitialSessionState.ImportPSModule($ModulesToImport) } If ($PSBoundParameters['PSSnapinsToImport']) { [void]$InitialSessionState.ImportPSSnapIn($PSSnapinsToImport,[ref]$Null) } If ($PSBoundParameters['FunctionsToLoad']) { Write-Verbose "Loading custom functions: $($FunctionsToLoad -join '; ')" ForEach ($Function in $FunctionsToLoad) { Try { RegisterScriptScopeFunction -Name $Function $Definition = Get-Content Function:\$Function -ErrorAction Stop Write-Debug "Definition: $($Definition)" $SessionStateFunction = New-Object System.Management.Automation.Runspaces.SessionStateFunctionEntry -ArgumentList $Function, $Definition $InitialSessionState.Commands.Add($SessionStateFunction) } Catch { Write-Warning "$($Function): $($_.Exception.Message)" } } } If ($PSBoundParameters.ContainsKey('ArgumentList')) { If (@($ArgumentList).count -match '0|1') { $SingleArgument = $True } Else { $SingleArgument = $False } } $RunspacePool = [runspacefactory]::CreateRunspacePool($InitialSessionState) $RunspacePool.ApartmentState = 'STA' [void]$RunspacePool.SetMaxRunspaces($Throttle) If ($PSVersionTable.PSVersion.Major -gt 2) { $RunspacePool.CleanupInterval = [timespan]::FromMinutes(2) } $RunspacePool.Open() If ($PSBoundParameters['FilePath']) { $ScriptBlock = [scriptblock]::Create((Get-Content $FilePath | Out-String)) } $RSPObject = New-Object PoshRS.PowerShell.RSRunspacePool -Property @{ RunspacePool = $RunspacePool MaxJobs = $RunspacePool.GetMaxRunspaces() RunspacePoolID = $RunspacePoolID } $Script:List = New-Object System.Collections.ArrayList If ($PSBoundParameters.ContainsKey('InputObject')) { [void]$list.AddRange($InputObject) $IsPipeline = $False } Else { $IsPipeline = $True } } Process { If ($IsPipeline -AND $PSBoundParameters.ContainsKey('InputObject')) { [void]$List.Add($InputObject) } Else { $IsPipeline = $False } } End { $SBParamCount = @(GetParamVariable -ScriptBlock $ScriptBlock).Count If ($PSBoundParameters.ContainsKey('InputObject')) { If ( ($ArgumentList) -and $ArgumentList.count -gt 0) { $SBParamCount++ } Else { $SBParamCount-- } } If ( ($ArgumentList) -and $ArgumentList.count -ne $SBParamCount -AND $IsPipeline) { Write-Verbose 'Will use $_ in Param() Block' $Script:Add_ = $True } Else { $Script:Add_ = $False } #region Convert ScriptBlock for $Using: $PreviousErrorAction = $ErrorActionPreference $ErrorActionPreference = 'Stop' Write-Verbose "PowerShell Version: $($PSVersionTable.PSVersion.Major)" Switch ($PSVersionTable.PSVersion.Major) { 2 { Write-Verbose "Using PSParser with PowerShell V2" $UsingVariables = @(GetUsingVariablesV2 -ScriptBlock $ScriptBlock) Write-Verbose "Using Count: $($UsingVariables.count)" Write-Verbose "$($UsingVariables|Out-String)" Write-Verbose "CommandOrigin: $($MyInvocation.CommandOrigin)" If ($UsingVariables.count -gt 0) { $UsingVariableValues = @($UsingVariables | ForEach { $Name = $_.Content -replace 'Using:' Try { If ($MyInvocation.CommandOrigin -eq 'Runspace') { $Value = (Get-Variable -Name $Name).Value } Else { $Value = $PSCmdlet.SessionState.PSVariable.Get($Name).Value If ([string]::IsNullOrEmpty($Value)) { Throw 'No value!' } } New-Object PoshRS.PowerShell.V2UsingVariable -Property @{ Name = $Name NewName = '$__using_{0}' -f $Name Value = $Value NewVarName = ('__using_{0}') -f $Name } } Catch { Throw "Start-RSJob : The value of the using variable '$($Var.SubExpression.Extent.Text)' cannot be retrieved because it has not been set in the local session." } }) Write-Verbose ("Found {0} `$Using: variables!" -f $UsingVariableValues.count) } If ($UsingVariables.count -gt 0 -OR $Script:Add_) { $NewScriptBlock = ConvertScriptBlockV2 $ScriptBlock -UsingVariable $UsingVariables -UsingVariableValue $UsingVariableValues } Else { $NewScriptBlock = $ScriptBlock } } Default { Write-Debug "Using AST with PowerShell V3+" $UsingVariables = @(GetUsingVariables $ScriptBlock | Group SubExpression | ForEach { $_.Group | Select -First 1 }) #region Get Variable Values If ($UsingVariables.count -gt 0) { $UsingVar = $UsingVariables | Group SubExpression | ForEach {$_.Group | Select -First 1} Write-Debug "CommandOrigin: $($MyInvocation.CommandOrigin)" $UsingVariableValues = @(ForEach ($Var in $UsingVar) { Try { If ($MyInvocation.CommandOrigin -eq 'Runspace') { $Value = Get-Variable -Name $Var.SubExpression.VariablePath.UserPath } Else { $Value = ($PSCmdlet.SessionState.PSVariable.Get($Var.SubExpression.VariablePath.UserPath)) If ([string]::IsNullOrEmpty($Value)) { Throw 'No value!' } } [pscustomobject]@{ Name = $Var.SubExpression.Extent.Text Value = $Value.Value NewName = ('$__using_{0}' -f $Var.SubExpression.VariablePath.UserPath) NewVarName = ('__using_{0}' -f $Var.SubExpression.VariablePath.UserPath) } } Catch { Throw "Start-RSJob : The value of the using variable '$($Var.SubExpression.Extent.Text)' cannot be retrieved because it has not been set in the local session." } }) #endregion Get Variable Values Write-Verbose ("Found {0} `$Using: variables!" -f $UsingVariableValues.count) } If ($UsingVariables.count -gt 0 -OR $Script:Add_) { $NewScriptBlock = ConvertScript $ScriptBlock } Else { $NewScriptBlock = $ScriptBlock } } } $ErrorActionPreference = $PreviousErrorAction #endregion Convert ScriptBlock for $Using: Write-Debug "ScriptBlock: $($NewScriptBlock)" [System.Threading.Monitor]::Enter($PoshRS_RunspacePools.syncroot) [void]$PoshRS_RunspacePools.Add($RSPObject) [System.Threading.Monitor]::Exit($PoshRS_RunspacePools.syncroot) If ($List.Count -gt 0) { Write-Debug "InputObject" ForEach ($Item in $list) { $ID = Increment Write-Verbose "Using $($Item) as pipeline variable" $PowerShell = [powershell]::Create().AddScript($NewScriptBlock) $PowerShell.RunspacePool = $RunspacePool [void]$PowerShell.AddArgument($Item) Write-Verbose "Checking for Using: variables" If ($UsingVariableValues.count -gt 0) { For ($i=0;$i -lt $UsingVariableValues.count;$i++) { Write-Verbose "Adding Param: $($UsingVariableValues[$i].Name) Value: $($UsingVariableValues[$i].Value)" [void]$PowerShell.AddParameter($UsingVariableValues[$i].NewVarName,$UsingVariableValues[$i].Value) } } Write-Verbose "Checking for ArgumentList" If ($PSBoundParameters.ContainsKey('ArgumentList')) { If ($SingleArgument) { ,$ArgumentList | ForEach { Write-Verbose "Adding Argument: $($_) <$($_.GetType().Fullname)>" [void]$PowerShell.AddArgument($_) } } Else { ForEach ($Argument in $ArgumentList) { Write-Verbose "Adding Argument: $($Argument) <$($Argument.GetType().Fullname)>" [void]$PowerShell.AddArgument($Argument) } } } Write-Verbose "Invoking Runspace" $Handle = $PowerShell.BeginInvoke() Write-Verbose "Determining Job Name" $_JobName = If ($PSVersionTable.PSVersion.Major -eq 2) { $JobName.Invoke() } Else { $JobName.InvokeReturnAsIs() } $Object = New-Object PoshRS.PowerShell.RSJob -Property @{ Name = $_JobName InstanceID = [guid]::NewGuid().ToString() ID = $ID Handle = $Handle InnerJob = $PowerShell Runspace = $PowerShell.Runspace Finished = $handle.IsCompleted Command = $ScriptBlock.ToString() RunspacePoolID = $RunSpacePoolID Batch = $Batch State = [System.Management.Automation.PSInvocationState]::Running } $RSPObject.LastActivity = Get-Date Write-Verbose "Adding RSJob to Jobs queue" [System.Threading.Monitor]::Enter($PoshRS_Jobs.syncroot) [void]$PoshRS_Jobs.Add($Object) [System.Threading.Monitor]::Exit($PoshRS_Jobs.syncroot) Write-Verbose "Display RSJob" $Object } } Else { Write-Debug "No InputObject" $ID = Increment $PowerShell = [powershell]::Create().AddScript($NewScriptBlock) $PowerShell.RunspacePool = $RunspacePool If ($UsingVariableValues) { For ($i=0;$i -lt $UsingVariableValues.count;$i++) { Write-Verbose "Adding Param: $($UsingVariableValues[$i].Name) Value: $($UsingVariableValues[$i].Value)" [void]$PowerShell.AddParameter($UsingVariableValues[$i].NewVarName,$UsingVariableValues[$i].Value) } } If ($PSBoundParameters.ContainsKey('ArgumentList')) { If ($SingleArgument) { ,$ArgumentList | ForEach { Write-Verbose "Adding Argument: $($_) <$($_.GetType().Fullname)>" [void]$PowerShell.AddArgument($_) } } Else { ForEach ($Argument in $ArgumentList) { Write-Verbose "Adding Argument: $($Argument) <$($Argument.GetType().Fullname)>" [void]$PowerShell.AddArgument($Argument) } } } $Handle = $PowerShell.BeginInvoke() $_JobName = If ($PSVersionTable.PSVersion.Major -eq 2) { $JobName.Invoke() } Else { $JobName.InvokeReturnAsIs() } $Object = New-Object PoshRS.PowerShell.RSJob -Property @{ Name = $_JobName InstanceID = [guid]::NewGuid().ToString() ID = $ID Handle = $Handle InnerJob = $PowerShell Runspace = $PowerShell.Runspace Finished = $handle.RSWaitHandle Command = $ScriptBlock.ToString() RunspacePoolID = $RunSpacePoolID Batch = $Batch State = [System.Management.Automation.PSInvocationState]::Running } $RSPObject.LastActivity = Get-Date [System.Threading.Monitor]::Enter($PoshRS_Jobs.syncroot) [void]$PoshRS_Jobs.Add($Object) [System.Threading.Monitor]::Exit($PoshRS_Jobs.syncroot) $Object } } } |