internal/functions/flowcontrol/Invoke-Parallel.ps1
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function Invoke-Parallel { <# .SYNOPSIS Function to control parallel processing using runspaces .DESCRIPTION Function to control parallel processing using runspaces Note that each runspace will not have access to variables and commands loaded in your session or in other runspaces by default. This behaviour can be changed with parameters. .PARAMETER ScriptFile File to run against all input objects. Must include parameter to take in the input object, or use $args. Optionally, include parameter to take in parameter. Example: C:\script.ps1 .PARAMETER ScriptBlock Scriptblock to run against all computers. You may use $Using:<Variable> language in PowerShell 3 and later. The parameter block is added for you, allowing behaviour similar to foreach-object: Refer to the input object as $_. Refer to the parameter parameter as $parameter .PARAMETER InputObject Run script against these specified objects. .PARAMETER Parameter This object is passed to every script block. You can use it to pass information to the script block; for example, the path to a logging folder Reference this object as $parameter if using the scriptblock parameterset. .PARAMETER ImportVariables If specified, get user session variables and add them to the initial session state .PARAMETER ImportModules If specified, get loaded modules and pssnapins, add them to the initial session state .PARAMETER Throttle Maximum number of threads to run at a single time. .PARAMETER SleepTimer Milliseconds to sleep after checking for completed runspaces and in a few other spots. I would not recommend dropping below 200 or increasing above 500 .PARAMETER RunspaceTimeout Maximum time in seconds a single thread can run. If execution of your code takes longer than this, it is disposed. Default: 0 (seconds) WARNING: Using this parameter requires that maxQueue be set to throttle (it will be by default) for accurate timing. Details here: http://gallery.technet.microsoft.com/Run-Parallel-Parallel-377fd430 .PARAMETER NoCloseOnTimeout Do not dispose of timed out tasks or attempt to close the runspace if threads have timed out. This will prevent the script from hanging in certain situations where threads become non-responsive, at the expense of leaking memory within the PowerShell host. .PARAMETER MaxQueue Maximum number of powershell instances to add to runspace pool. If this is higher than $throttle, $timeout will be inaccurate If this is equal or less than throttle, there will be a performance impact The default value is $throttle times 3, if $runspaceTimeout is not specified The default value is $throttle, if $runspaceTimeout is specified .PARAMETER LogFile Path to a file where we can log results, including run time for each thread, whether it completes, completes with errors, or times out. .PARAMETER AppendLog Append to existing log .PARAMETER Quiet Disable progress bar .EXAMPLE Each example uses Test-ForPacs.ps1 which includes the following code: param($computer) if(test-connection $computer -count 1 -quiet -BufferSize 16){ $object = [pscustomobject] @{ Computer=$computer; Available=1; Kodak=$( if((test-path "\\$computer\c$\users\public\desktop\Kodak Direct View Pacs.url") -or (test-path "\\$computer\c$\documents and settings\all users\desktop\Kodak Direct View Pacs.url") ){"1"}else{"0"} ) } } else{ $object = [pscustomobject] @{ Computer=$computer; Available=0; Kodak="NA" } } $object .EXAMPLE Invoke-Parallel -scriptfile C:\public\Test-ForPacs.ps1 -inputobject $(get-content C:\pcs.txt) -runspaceTimeout 10 -throttle 10 Pulls list of PCs from C:\pcs.txt, Runs Test-ForPacs against each If any query takes longer than 10 seconds, it is disposed Only run 10 threads at a time .EXAMPLE Invoke-Parallel -scriptfile C:\public\Test-ForPacs.ps1 -inputobject c-is-ts-91, c-is-ts-95 Runs against c-is-ts-91, c-is-ts-95 (-computername) Runs Test-ForPacs against each .EXAMPLE $stuff = [pscustomobject] @{ ContentFile = "windows\system32\drivers\etc\hosts" Logfile = "C:\temp\log.txt" } $computers | Invoke-Parallel -parameter $stuff { $contentFile = join-path "\\$_\c$" $parameter.contentfile Get-Content $contentFile | set-content $parameter.logfile } This example uses the parameter argument. This parameter is a single object. To pass multiple items into the script block, we create a custom object (using a PowerShell v3 language) with properties we want to pass in. Inside the script block, $parameter is used to reference this parameter object. This example sets a content file, gets content from that file, and sets it to a predefined log file. .EXAMPLE $test = 5 1..2 | Invoke-Parallel -ImportVariables {$_ * $test} Add variables from the current session to the session state. Without -ImportVariables $Test would not be accessible .EXAMPLE $test = 5 1..2 | Invoke-Parallel {$_ * $Using:test} Reference a variable from the current session with the $Using:<Variable> syntax. Requires PowerShell 3 or later. Note that -ImportVariables parameter is no longer necessary. .FUNCTIONALITY PowerShell Language .NOTES Credit to Boe Prox for the base runspace code and $Using implementation http://learn-powershell.net/2012/05/10/speedy-network-information-query-using-powershell/ http://gallery.technet.microsoft.com/scriptcenter/Speedy-Network-Information-5b1406fb#content https://github.com/proxb/PoshRSJob/ Credit to T Bryce Yehl for the Quiet and NoCloseOnTimeout implementations Credit to Sergei Vorobev for the many ideas and contributions that have improved functionality, reliability, and ease of use .LINK https://github.com/RamblingCookieMonster/Invoke-Parallel #> [cmdletbinding(DefaultParameterSetName = 'ScriptBlock')] param ( [Parameter(ParameterSetName = 'ScriptBlock')] [System.Management.Automation.ScriptBlock]$ScriptBlock, [Parameter(ParameterSetName = 'ScriptFile')] [ValidateScript( { Test-Path $_ -pathtype leaf })] $ScriptFile, [Parameter(Mandatory = $true, ValueFromPipeline = $true)] [Alias('CN', '__Server', 'IPAddress', 'Server', 'ComputerName')] [PSObject]$InputObject, [string]$ObjectName = "input objects", [string]$Activity = "Running Query", [string]$Status = "Starting threads", [PSObject]$Parameter, [switch]$ImportVariables, [switch]$ImportModules, [switch]$ImportFunctions, [int]$Throttle = 20, [int]$SleepTimer = 200, [int]$RunspaceTimeout = 0, [switch]$NoCloseOnTimeout = $false, [int]$MaxQueue, [validatescript( { Test-Path (Split-Path $_ -parent) })] [switch] $AppendLog = $false, [string]$LogFile, [switch] $Quiet = $false ) begin { # save default runspace $defaultrunspace = [System.Management.Automation.Runspaces.Runspace]::DefaultRunspace #No max queue specified? Estimate one. #We use the script scope to resolve an odd PowerShell 2 issue where MaxQueue isn't seen later in the function if ( -not $PSBoundParameters.ContainsKey('MaxQueue') ) { if ($RunspaceTimeout -ne 0) { $script:MaxQueue = $Throttle } else { $script:MaxQueue = $Throttle * 3 } } else { $script:MaxQueue = $MaxQueue } $ProgressId = Get-Random Write-Verbose "Throttle: '$throttle' SleepTimer '$sleepTimer' runSpaceTimeout '$runspaceTimeout' maxQueue '$maxQueue' logFile '$logFile'" #If they want to import variables or modules, create a clean runspace, get loaded items, use those to exclude items if ($ImportVariables -or $ImportModules -or $ImportFunctions) { $StandardUserEnv = [powershell]::Create().addscript( { #Get modules, snapins, functions in this clean runspace $Modules = Get-Module | Select-Object -ExpandProperty Name $Snapins = @( if ( Get-Command -Name 'Get-PSSnapIn' -ErrorAction SilentlyContinue ) { Get-PSSnapin | Select-Object -ExpandProperty Name } ); $Functions = Get-ChildItem function:\ | Select-Object -ExpandProperty Name #Get variables in this clean runspace #Called last to get vars like $? into session $Variables = Get-Variable | Select-Object -ExpandProperty Name #Return a hashtable where we can access each. @{ Variables = $Variables Modules = $Modules Snapins = $Snapins Functions = $Functions } }).invoke()[0] if ($ImportVariables) { #Exclude common parameters, bound parameters, and automatic variables Function _temp { [cmdletbinding(SupportsShouldProcess)] param() } $VariablesToExclude = @( (Get-Command _temp | Select-Object -ExpandProperty parameters).Keys + $PSBoundParameters.Keys + $StandardUserEnv.Variables ) Write-Verbose "Excluding variables $( ($VariablesToExclude | Sort-Object ) -join ", ")" # we don't use 'Get-Variable -Exclude', because it uses regexps. # One of the veriables that we pass is '$?'. # There could be other variables with such problems. # Scope 2 required if we move to a real module $UserVariables = @( Get-Variable | Where-Object { -not ($VariablesToExclude -contains $_.Name) } ) Write-Verbose "Found variables to import: $( ($UserVariables | Select-Object -expandproperty Name | Sort-Object ) -join ", " | Out-String).`n" } if ($ImportModules) { $UserModules = @( Get-Module | Where-Object { $StandardUserEnv.Modules -notcontains $_.Name -and (Test-Path $_.Path -ErrorAction SilentlyContinue) } | Select-Object -ExpandProperty Path ) $UserSnapins = @( if ( Get-Command -Name 'Get-PSSnapIn' -ErrorAction SilentlyContinue ) { Get-PSSnapin | Select-Object -ExpandProperty Name | Where-Object { $StandardUserEnv.Snapins -notcontains $_ } } ); } if ($ImportFunctions) { $UserFunctions = @( Get-ChildItem function:\ | Where-Object { $StandardUserEnv.Functions -notcontains $_.Name } ) } } #region functions Function Get-RunspaceData { [cmdletbinding()] param( [switch]$Wait ) #loop through runspaces #if $wait is specified, keep looping until all complete Do { #set more to false for tracking completion $more = $false #Progress bar if we have inputobject count (bound parameter) if (-not $Quiet) { $writeProgressSplat = @{ Id = $ProgressId Activity = $Activity Status = $Status CurrentOperation = "$startedCount threads defined - $totalCount $ObjectName - $script:completedCount $ObjectName processed" PercentComplete = try { $script:completedCount / $totalCount * 100 } catch { 0 } } Write-Progress @writeProgressSplat } #run through each runspace. Foreach ($runspace in $runspaces) { #get the duration - inaccurate $currentdate = Get-Date $runtime = $currentdate - $runspace.startTime $runMin = [math]::Round( $runtime.totalminutes , 2 ) #set up log object $log = "" | Select-Object Date, Action, Runtime, Status, Details $log.Action = "Removing:'$($runspace.object)'" $log.Date = $currentdate $log.Runtime = "$runMin minutes" #If runspace completed, end invoke, dispose, recycle, counter++ If ($runspace.Runspace.isCompleted) { $script:completedCount++ #check if there were errors if ($runspace.powershell.Streams.Error.Count -gt 0) { #set the logging info and move the file to completed $log.status = "CompletedWithErrors" Write-Verbose ($log | ConvertTo-Csv -Delimiter ";" -NoTypeInformation)[1] foreach ($ErrorRecord in $runspace.powershell.Streams.Error) { Write-Error -ErrorRecord $ErrorRecord } } else { #add logging details and cleanup $log.status = "Completed" Write-Verbose ($log | ConvertTo-Csv -Delimiter ";" -NoTypeInformation)[1] } #everything is logged, clean up the runspace $runspace.powershell.EndInvoke($runspace.Runspace) $runspace.powershell.dispose() $runspace.Runspace = $null $runspace.powershell = $null } #If runtime exceeds max, dispose the runspace ElseIf ( $runspaceTimeout -ne 0 -and $runtime.totalseconds -gt $runspaceTimeout) { $script:completedCount++ $timedOutTasks = $true #add logging details and cleanup $log.status = "TimedOut" Write-Verbose ($log | ConvertTo-Csv -Delimiter ";" -NoTypeInformation)[1] Write-Error "Runspace timed out at $($runtime.totalseconds) seconds for the object:`n$($runspace.object | Out-String)" #Depending on how it hangs, we could still get stuck here as dispose calls a synchronous method on the powershell instance if (!$noCloseOnTimeout) { $runspace.powershell.dispose() } $runspace.Runspace = $null $runspace.powershell = $null $completedCount++ } #If runspace isn't null set more to true ElseIf ($runspace.Runspace -ne $null ) { $log = $null $more = $true } #log the results if a log file was indicated if ($logFile -and $log) { ($log | ConvertTo-Csv -Delimiter ";" -NoTypeInformation)[1] | Out-File $LogFile -append } } #Clean out unused runspace jobs $temphash = $runspaces.clone() $temphash | Where-Object { $_.runspace -eq $Null } | ForEach-Object { $Runspaces.remove($_) } #sleep for a bit if we will loop again if ($PSBoundParameters['Wait']) { Start-Sleep -milliseconds $SleepTimer } #Loop again only if -wait parameter and there are more runspaces to process } while ($more -and $PSBoundParameters['Wait']) #End of runspace function } #endregion functions #region Init if ($PSCmdlet.ParameterSetName -eq 'ScriptFile') { $ScriptBlock = [scriptblock]::Create( $(Get-Content $ScriptFile | Out-String) ) } elseif ($PSCmdlet.ParameterSetName -eq 'ScriptBlock') { #Start building parameter names for the param block [string[]]$ParamsToAdd = '$_' if ( $PSBoundParameters.ContainsKey('Parameter') ) { $ParamsToAdd += '$Parameter' } $UsingVariableData = $Null # This code enables $Using support through the AST. # This is entirely from Boe Prox, and his https://github.com/proxb/PoshRSJob module; all credit to Boe! if ($PSVersionTable.PSVersion.Major -gt 2) { #Extract using references $UsingVariables = $ScriptBlock.ast.FindAll( { $args[0] -is [System.Management.Automation.Language.UsingExpressionAst] }, $True) If ($UsingVariables) { $List = New-Object 'System.Collections.Generic.List`1[System.Management.Automation.Language.VariableExpressionAst]' ForEach ($Ast in $UsingVariables) { [void]$list.Add($Ast.SubExpression) } $UsingVar = $UsingVariables | Group-Object -Property SubExpression | ForEach-Object { $_.Group | Select-Object -First 1 } #Extract the name, value, and create replacements for each $UsingVariableData = ForEach ($Var in $UsingVar) { try { $Value = Get-Variable -Name $Var.SubExpression.VariablePath.UserPath -ErrorAction Stop [pscustomobject]@{ Name = $Var.SubExpression.Extent.Text Value = $Value.Value NewName = ('$__using_{0}' -f $Var.SubExpression.VariablePath.UserPath) NewVarName = ('__using_{0}' -f $Var.SubExpression.VariablePath.UserPath) } } catch { Write-Error "$($Var.SubExpression.Extent.Text) is not a valid Using: variable." } } $ParamsToAdd += $UsingVariableData | Select-Object -ExpandProperty NewName -Unique $NewParams = $UsingVariableData.NewName -join ', ' $Tuple = [Tuple]::Create($list, $NewParams) $bindingFlags = [Reflection.BindingFlags]"Default,NonPublic,Instance" $GetWithInputHandlingForInvokeCommandImpl = ($ScriptBlock.ast.gettype().GetMethod('GetWithInputHandlingForInvokeCommandImpl', $bindingFlags)) $StringScriptBlock = $GetWithInputHandlingForInvokeCommandImpl.Invoke($ScriptBlock.ast, @($Tuple)) $ScriptBlock = [scriptblock]::Create($StringScriptBlock) Write-Verbose $StringScriptBlock } } $ScriptBlock = $ExecutionContext.InvokeCommand.NewScriptBlock("param($($ParamsToAdd -Join ", "))`r`n" + $Scriptblock.ToString()) } else { Throw "Must provide ScriptBlock or ScriptFile"; Break } Write-Debug "`$ScriptBlock: $($ScriptBlock | Out-String)" Write-Verbose "Creating runspace pool and session states" #If specified, add variables and modules/snapins to session state $sessionstate = [System.Management.Automation.Runspaces.InitialSessionState]::CreateDefault() $sessionstate.Variables.Add((New-Object -TypeName System.Management.Automation.Runspaces.SessionStateVariableEntry -ArgumentList 'WarningPreference', 'SilentlyContinue', $null)) if ($ImportVariables -and $UserVariables.count -gt 0) { foreach ($Variable in $UserVariables) { $sessionstate.Variables.Add((New-Object -TypeName System.Management.Automation.Runspaces.SessionStateVariableEntry -ArgumentList $Variable.Name, $Variable.Value, $null) ) } } if ($ImportModules) { if ($UserModules.count -gt 0) { foreach ($ModulePath in $UserModules) { $sessionstate.ImportPSModule($ModulePath) } } if ($UserSnapins.count -gt 0) { foreach ($PSSnapin in $UserSnapins) { [void]$sessionstate.ImportPSSnapIn($PSSnapin, [ref]$null) } } } if ($ImportFunctions -and $UserFunctions.count -gt 0) { foreach ($FunctionDef in $UserFunctions) { $sessionstate.Commands.Add((New-Object System.Management.Automation.Runspaces.SessionStateFunctionEntry -ArgumentList $FunctionDef.Name, $FunctionDef.ScriptBlock)) } } #Create runspace pool $runspacepool = [runspacefactory]::CreateRunspacePool(1, $Throttle, $sessionstate, $Host) $runspacepool.Open() Write-Verbose "Creating empty collection to hold runspace jobs" $Script:runspaces = New-Object System.Collections.ArrayList #If inputObject is bound get a total count and set bound to true $bound = $PSBoundParameters.keys -contains "InputObject" if (-not $bound) { [System.Collections.ArrayList]$allObjects = @() } #Set up log file if specified if ( $LogFile -and (-not (Test-Path $LogFile) -or $AppendLog -eq $false)) { New-Item -ItemType file -Path $logFile -Force | Out-Null ("" | Select-Object -Property Date, Action, Runtime, Status, Details | ConvertTo-Csv -NoTypeInformation -Delimiter ";")[0] | Out-File $LogFile } #write initial log entry $log = "" | Select-Object -Property Date, Action, Runtime, Status, Details $log.Date = Get-Date $log.Action = "Batch processing started" $log.Runtime = $null $log.Status = "Started" $log.Details = $null if ($logFile) { ($log | ConvertTo-Csv -Delimiter ";" -NoTypeInformation)[1] | Out-File $LogFile -Append } $timedOutTasks = $false #endregion INIT } process { #add piped objects to all objects or set all objects to bound input object parameter if ($bound) { $allObjects = $InputObject } else { [void]$allObjects.add( $InputObject ) } } end { #Use Try/Finally to catch Ctrl+C and clean up. try { #counts for progress $totalCount = $allObjects.count $script:completedCount = 0 $startedCount = 0 foreach ($object in $allObjects) { #region add scripts to runspace pool #Create the powershell instance, set verbose if needed, supply the scriptblock and parameters $powershell = [powershell]::Create() if ($VerbosePreference -eq 'Continue') { [void]$PowerShell.AddScript( { $VerbosePreference = 'Continue' }) } [void]$PowerShell.AddScript($ScriptBlock).AddArgument($object) if ($parameter) { [void]$PowerShell.AddArgument($parameter) } # $Using support from Boe Prox if ($UsingVariableData) { Foreach ($UsingVariable in $UsingVariableData) { Write-Verbose "Adding $($UsingVariable.Name) with value: $($UsingVariable.Value)" [void]$PowerShell.AddArgument($UsingVariable.Value) } } #Add the runspace into the powershell instance $powershell.RunspacePool = $runspacepool #Create a temporary collection for each runspace $temp = "" | Select-Object PowerShell, StartTime, object, Runspace $temp.PowerShell = $powershell $temp.StartTime = Get-Date $temp.object = $object #Save the handle output when calling BeginInvoke() that will be used later to end the runspace $temp.Runspace = $powershell.BeginInvoke() $startedCount++ #Add the temp tracking info to $runspaces collection Write-Verbose ( "Adding {0} to collection at {1}" -f $temp.object, $temp.starttime.tostring() ) $runspaces.Add($temp) | Out-Null #loop through existing runspaces one time Get-RunspaceData #If we have more running than max queue (used to control timeout accuracy) #Script scope resolves odd PowerShell 2 issue $firstRun = $true while ($runspaces.count -ge $Script:MaxQueue) { #give verbose output if ($firstRun) { Write-Verbose "$($runspaces.count) items running - exceeded $Script:MaxQueue limit." } $firstRun = $false #run get-runspace data and sleep for a short while Get-RunspaceData Start-Sleep -Milliseconds $sleepTimer } #endregion add scripts to runspace pool } Write-Verbose ( "Finish processing the remaining runspace jobs: {0}" -f ( @($runspaces | Where-Object { $_.Runspace -ne $Null }).Count) ) Get-RunspaceData -wait if (-not $quiet) { Write-Progress -Id $ProgressId -Activity $Activity -Status $Status -Completed } } finally { #Close the runspace pool, unless we specified no close on timeout and something timed out if ( ($timedOutTasks -eq $false) -or ( ($timedOutTasks -eq $true) -and ($noCloseOnTimeout -eq $false) ) ) { Write-Verbose "Closing the runspace pool" $runspacepool.close() } #collect garbage [gc]::Collect() } [System.Management.Automation.Runspaces.Runspace]::DefaultRunspace = $defaultrunspace } } # SIG # Begin signature block # MIIZewYJKoZIhvcNAQcCoIIZbDCCGWgCAQExCzAJBgUrDgMCGgUAMGkGCisGAQQB # gjcCAQSgWzBZMDQGCisGAQQBgjcCAR4wJgIDAQAABBAfzDtgWUsITrck0sYpfvNR # AgEAAgEAAgEAAgEAAgEAMCEwCQYFKw4DAhoFAAQUKENc8YpNDjfgJc0rfhB+TCtb # 5F+gghSJMIIE/jCCA+agAwIBAgIQDUJK4L46iP9gQCHOFADw3TANBgkqhkiG9w0B # AQsFADByMQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYD # VQQLExB3d3cuZGlnaWNlcnQuY29tMTEwLwYDVQQDEyhEaWdpQ2VydCBTSEEyIEFz # c3VyZWQgSUQgVGltZXN0YW1waW5nIENBMB4XDTIxMDEwMTAwMDAwMFoXDTMxMDEw # NjAwMDAwMFowSDELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDkRpZ2lDZXJ0LCBJbmMu # MSAwHgYDVQQDExdEaWdpQ2VydCBUaW1lc3RhbXAgMjAyMTCCASIwDQYJKoZIhvcN # AQEBBQADggEPADCCAQoCggEBAMLmYYRnxYr1DQikRcpja1HXOhFCvQp1dU2UtAxQ # 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