Import-WsusUpdate

2023.9.17

Private/DownloadFilesInParallel.ps1

                                function DownloadFilesInParallel {

    [CmdletBinding()]

    param (

        [Parameter(Mandatory)]

        [System.Collections.ArrayList]

        $FileInfoList,

        [Parameter(Mandatory)]

        [string]

        $OutputPath,

        [Parameter()]

        [int]

        $MaxSimultaneousTransfers = 4

    )

    $ENDED_BITSJOB_STATES = @("Suspended", "Error", "TransientError", "Transferred", "Canceled")

    $ENDED_JOB_STATES = @("Blocked", "Completed", "Disconnected", "Failed", "Stopped", "Suspended")

    try {

        $startTime = Get-Date

        $minutesTaken = 0

        $currentDownloadNumber = 0

        $downloadsFinished = 0

        $totalUpdateFiles = $FileInfoList.Count

        $activeTransfers = New-Object -TypeName "System.Collections.ArrayList"

        $filesLeft = New-Object -TypeName "System.Collections.Queue"

        $FileInfoList | ForEach-Object { $filesLeft.Enqueue($_) }

        while ($filesLeft.Count -gt 0 -or $activeTransfers.Count -gt 0) {

            $elapsedTime = (Get-Date) - $startTime

            $minutesTakenNew = [int]([Math]::Floor($elapsedTime.TotalMinutes))

            if ($minutesTakenNew -gt $minutesTaken) {

                Write-Verbose "Downloading $totalUpdateFiles update file$( if ($totalUpdateFiles -ne 1) { "s" } ), $downloadsFinished update file$( if ($downloadsFinished -ne 1) { "s" } ) downloaded."

                Write-Verbose "Elapsed time: $minutesTakenNew minute$( if ($minutesTakenNew -ne 1) { "s" } )."

                $minutesTaken = $minutesTakenNew

            }

            # Start another transfer if we're below the max simultaneous transfers threshold

            if ($filesLeft.Count -gt 0 -and $activeTransfers.Count -lt $MaxSimultaneousTransfers) {

                $currentDownloadNumber += 1

                $downloadProgress = "$currentDownloadNumber/$totalUpdateFiles"

                $parsedFileInfo = $filesLeft.Dequeue()

                $fileDownloadUri = $parsedFileInfo["Uri"]

                $fileName = $parsedFileInfo["FileName"]

                $fileDownloadPath = Join-Path $OutputPath $fileName -ErrorAction Stop

                $fileDownloadPathTemp = "$fileDownloadPath.tmp"

                if (Test-Path $fileDownloadPath) {

                    Write-Verbose "Skipping already downloaded update file $fileName ($downloadProgress)."

                    continue

                }

                if (Test-Path $fileDownloadPathTemp) {

                    Write-Verbose "Restarting download for incomplete update file $fileName ($downloadProgress)..."

                    try {

                        Remove-Item -Path $fileDownloadPathTemp -ErrorAction Stop

                    } catch {

                        Write-Error -Message "Could not remove incomplete update file ($fileDownloadPathTemp). Please remove this file manually and try again."

                        return

                    }

                } else {

                    Write-Output "Downloading update file $fileName ($downloadProgress)..."

                }

                try {

                    $transferParams = GetBitsTransferSplatBase -Source $fileDownloadUri

                    $newBitsJob = Start-BitsTransfer @transferParams `

                        -DisplayName "Import-WsusUpdate parallel download for $fileName ($downloadProgress)" `

                        -Destination $fileDownloadPathTemp `

                        -Asynchronous `

                        -ErrorAction Stop

                    [void]($activeTransfers.Add(@{

                        "FileName" = $fileName

                        "TempPath" = $fileDownloadPathTemp

                        "Path" = $fileDownloadPath

                        "BitsJob" = $newBitsJob

                    }))

                    # Immediately restart the loop to queue up another job asap.

                    continue

                } catch {

                    Write-Warning "BITS transfer for update file $fileName failed with the following error: $_"

                    Write-Verbose "Full error info:"

                    Write-Verbose ($_ | Format-List -Force | Out-String)

                    Write-Warning "Retrying download once more with Invoke-WebRequest as a fallback..."

                    try {

                        $webRequestParams = GetWebRequestSplatBase -Uri $fileDownloadUri

                        $webRequestParams["OutFile"] = $fileDownloadPathTemp

                        # TODO: Deserialization in job prevents WebSession from working, although this likely won't matter right now.

                        # "Cannot convert the "Microsoft.PowerShell.Commands.WebRequestSession" value of type "Deserialized.Microsoft.PowerShell.Commands.WebRequestSession" to type "Microsoft.PowerShell.Commands.WebRequestSession".

                        $webRequestParams["SessionVariable"] = $null

                        $webRequestParams["WebSession"] = $null

                        $job = Start-Job -Name "Import-WsusUpdate parallel download fallback for $fileName ($downloadProgress)" -ErrorAction Stop -ScriptBlock {

                            [CmdletBinding()]

                            param ()

                            # Hide progress since this is a parallel background download and it will speed up

                            # Invoke-WebRequest.

                            $ProgressPreference = "SilentlyContinue"

                            $webRequestParams = $using:webRequestParams

                            [void](Invoke-WebRequest @webRequestParams -ErrorAction Stop)

                        }

                        [void]($activeTransfers.Add(@{

                            "FileName" = $fileName

                            "TempPath" = $fileDownloadPathTemp

                            "Path" = $fileDownloadPath

                            "WebRequestJob" = $job

                        }))

                    } catch {

                        Write-Warning "Failed to start fallback download for update file $fileName (URI: $fileDownloadUri) with the following error: $_"

                        throw

                    }

                }

            }

            # We don't need to start another job - track progress of our current transfers

            if ($activeTransfers.Count -gt 0) {

                $transferJustFinished = $false

                for ($index = 0; $index -lt $activeTransfers.Count; $index += 1) {

                    $activeTransfer = $activeTransfers[$index]

                    if ($null -ne $activeTransfer["BitsJob"]) {

                        $updateBitsJob = Get-BitsTransfer -JobId $activeTransfer["BitsJob"].JobId -ErrorAction Stop

                        if ($updateBitsJob.JobState -notin $ENDED_BITSJOB_STATES) {

                            continue

                        }

                        if ($updateBitsJob.JobState -ne "Transferred") {

                            Write-Error -Message "Download for update file $( $activeTransfer["FileName"] ) ended unfinished with state $( $updateBitsJob.JobState )." `

                                -Category OperationStopped `

                                -ErrorId "ParallelBITSTransferFailed"

                            return

                        }

                        Complete-BitsTransfer -BitsJob $activeTransfer["BitsJob"] -ErrorAction Stop

                    } elseif ($null -ne $activeTransfer["WebRequestJob"]) {

                        $jobState = $activeTransfer["WebRequestJob"]

                        if ($jobState.State -notin $ENDED_JOB_STATES) {

                            continue

                        }

                        if ($jobState.State -ne "Completed") {

                            Write-Error -Message "Fallback download for update file $( $activeTransfer["FileName"] ) ended unfinished with state $( $jobState.State )." `

                                -Category OperationStopped `

                                -ErrorId "ParallelInvokeWebRequestTransferFailed"

                            return

                        }

                        Remove-Job -Job $activeTransfer["WebRequestJob"] -ErrorAction SilentlyContinue -Confirm:$false

                    } else {

                        throw "Unexpected error: BitsJob and WebRequestJob were both null."

                    }

                    Write-Verbose "Finished downloading update file $( $activeTransfer["FileName"] )..."

                    Write-Verbose "Moving finished download to its proper path $( $activeTransfer["Path"] )."

                    Move-Item -Path $activeTransfer["TempPath"] -Destination $activeTransfer["Path"] -ErrorAction Stop

                    $downloadsFinished += 1

                    $activeTransfers.RemoveAt($index)

                    $index -= 1

                    $transferJustFinished = $true

                }

                if ($transferJustFinished) {

                    # Skip sleep and start new job immediately

                    continue

                }

            }

            # Check for progress updates every so often

            Start-Sleep -Milliseconds 500

        }

    } finally {

        if ($activeTransfers.Count -gt 0) {

            Write-Verbose "Cleaning up $( $activeTransfers.Count ) active transfer$( if ( $activeTransfers.Count -gt 1 ) { "s" } )."

            while ($activeTransfers.Count -gt 0) {

                if ($null -ne $activeTransfers[0]["BitsJob"]) {

                    Remove-BitsTransfer -BitsJob $activeTransfers[0]["BitsJob"] -ErrorAction SilentlyContinue

                } elseif ($null -ne $activeTransfers[0]["WebRequestJob"]) {

                    [void](Stop-Job -Job $activeTransfers[0]["WebRequestJob"] -ErrorAction SilentlyContinue -Confirm:$false)

                    Remove-Job -Job $activeTransfers[0]["WebRequestJob"] -ErrorAction SilentlyContinue -Confirm:$false

                } else {

                    Write-Verbose "Skipping removal of lingering transfer as both BitsJob and WebRequestJob were null."

                }

                $activeTransfers.RemoveAt(0)

            }

        }

    }

}

# Copyright (c) 2023 AJ Tek Corporation. All Rights Reserved.

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