Functions/Invoke-LogRotation.ps1
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function Invoke-LogRotation { <# .SYNOPSIS Handle log rotation. .DESCRIPTION Invoke-LogRotation handles log rotation, using the log parameters defined in the log object. This function is called within the Write-Log function so that log rotation are invoked after each write to the log file. .NOTES Author: Øyvind Kallstad Date: 21.11.2014 Version: 1.0 #> [CmdletBinding()] param ( # The log object created using the New-Log function. Defaults to reading the global PSLOG variable. [Parameter(ValueFromPipeline)] [ValidateNotNullorEmpty()] [object] $Log = $global:PSLOG ) try { # get current size of log file $currentSize = (Get-Item $Log.Path).Length # get log name $logFileName = Split-Path $Log.Path -Leaf $logFilePath = Split-Path $Log.Path $logFileNameWithoutExtension = [System.IO.Path]::GetFileNameWithoutExtension($logFileName) $logFileNameExtension = [System.IO.Path]::GetExtension($logFileName) # if MaxLogFiles is 1 just keep the original one and let it grow if (-not($Log.MaxLogFiles -eq 1)) { if ($currentSize -ge $Log.MaxLogSize) { # construct name of archived log file $newLogFileName = $logFileNameWithoutExtension + (Get-Date -Format 'yyyyMMddHHmmss').ToString() + $logFileNameExtension # copy old log file to new using the archived name constructed above Copy-Item -Path $Log.Path -Destination (Join-Path (Split-Path $Log.Path) $newLogFileName) # set new empty log file if ([string]::IsNullOrEmpty($Log.Header)) { Set-Content -Path $Log.Path -Value $null -Encoding 'UTF8' -Force } else { Set-Content -Path $Log.Path -Value $Log.Header -Encoding 'UTF8' -Force } # if MaxLogFiles is 0 don't delete any old archived log files if (-not($Log.MaxLogFiles -eq 0)) { # set filter to search for archived log files $archivedLogFileFilter = $logFileNameWithoutExtension + '??????????????' + $logFileNameExtension # get archived log files $oldLogFiles = Get-Item -Path "$(Join-Path -Path $logFilePath -ChildPath $archivedLogFileFilter)" if ([bool]$oldLogFiles) { # compare found log files to MaxLogFiles parameter of the log object, and delete oldest until we are # back to the correct number if (($oldLogFiles.Count + 1) -gt $Log.MaxLogFiles) { [int]$numTooMany = (($oldLogFiles.Count) + 1) - $log.MaxLogFiles $oldLogFiles | Sort-Object 'LastWriteTime' | Select-Object -First $numTooMany | Remove-Item } } } } } } catch { Write-Warning $_.Exception.Message } } |