Public/Write-Log.ps1
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Function Write-Log { <# .SYNOPSIS Writing log messages into a logfile and additionally to the console output. The messages are also redirected to the Apteco software, if used in a custom channel .DESCRIPTION The logfile getting written looks like 20210217134552 a6f3eda5-1b50-4841-861e-010174784e8c INFO Hello World 20210217134617 a6f3eda5-1b50-4841-861e-010174784e8c ERROR Hello World separated by tabs. Make sure, the variables $logfile and $processId are present before calling this. Otherwise they will be created automatically. The variables could be filled like $logfile = ".\test.log" $processId = [guid]::NewGuid() The process id is good for parallel calls so you know they belong together .PARAMETER Message The message the script should log into a file and additionally to the console .PARAMETER WriteToHostToo Boolean flag (default=true) to let the function put the message additionally to the console .PARAMETER Severity Uses the enum [LogSeverity] (default=[LogSeverity]::VERBOSE) to choose the loglevel. The logfile will contain that loglevel and depending on error or warning, it will be shown in the console .EXAMPLE Write-Log -message "Hello World" .EXAMPLE Write-Log -message "Hello World" -severity ([LogSeverity]::ERROR) .EXAMPLE "Hello World" | Write-Log .EXAMPLE Write-Log -message "Hello World" -WriteToHostToo $false .INPUTS String .OUTPUTS $null .NOTES Author: florian.von.bracht@apteco.de #> [cmdletbinding()] param( [Parameter(Mandatory=$true,ValueFromPipeline)][String]$Message ,[Parameter(Mandatory=$false)][Boolean]$WriteToHostToo = $true ,[Parameter(Mandatory=$false)][LogSeverity]$Severity = [LogSeverity]::VERBOSE ) Begin { # If the variable is not present, it will create a temporary file If ( $null -eq $logfile ) { $f = New-TemporaryFile $Script:logfile = $f.FullName Write-Warning -Message "There is no variable '`$logfile' present on 'Script' scope. Created one at '$( $Script:logfile )'" } # Testing the path If ( ( Test-Path -Path $logfile -IsValid ) -eq $false ) { Write-Error -Message "Invalid variable '`$logfile'. The path '$( $logfile )' is invalid." } # If a process id (to identify this session by a guid) it will be set automatically here If ( $null -eq $processId ) { $Script:processId = [guid]::NewGuid().ToString() Write-Warning -Message "There is no variable '`$processId' present on 'Script' scope. Created one with '$( $Script:processId )'" } } Process { # Create an array first for all the parts of the log message $logarray = @( [datetime]::Now.ToString("yyyyMMddHHmmss") $Script:processId $Severity.ToString() $Message ) # Put the array together $logstring = $logarray -join "`t" # Save the string to the logfile #$logstring | Out-File -FilePath $logfile -Encoding utf8 -Append -NoClobber #Out-File -InputObject = $logstring $randomDelay = Get-Random -Maximum 3000 $outArgs = @{ FilePath = $script:logfile InputObject = $logstring Encoding = "utf8" Append = $true NoClobber = $true } Invoke-CommandRetry -Command 'Out-File' -Args $outArgs -retries 10 -MillisecondsDelay $randomDelay | Out-Null # Put the string to host, too If ( $WriteToHostToo -eq $true ) { # Write-Host $message # Updating to the newer streams Information, Verbose, Error and Warning Switch ( $Severity ) { ( [LogSeverity]::VERBOSE ) { #Write-Verbose $message $message -Verbose # To always show the logmessage without verbose flag, execute $VerbosePreference = "Continue" Write-Output -InputObject $Message } ( [LogSeverity]::INFO ) { Write-Information -MessageData $Message -InformationAction Continue } ( [LogSeverity]::WARNING ) { Write-Warning -Message $Message } ( [LogSeverity]::ERROR ) { Write-Error -Message $Message -CategoryActivity "ERROR" } Default { #Write-Verbose -Message $message -Verbose Write-Output -InputObject $Message } } } # Return #$null } End { } } |