Public/Log/Write-Log.ps1
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Function Write-Log { <# .SYNOPSIS Writes a nicely formatted Message to stdout/file/event log. .DESCRIPTION It uses optional $Global:LogConfiguration object which describes logging configuration (see LogConfiguration.ps1). .INPUTS A string message to log. .EXAMPLE Write-Log -Info "Generating file test.txt." [I] 2017-05-19 11:14:28 [hostName/userName]: (scriptName/commandName/1) Generating file test.txt. .EXAMPLE $Global.LogConfiguration.LogLevel = [LogLevel]::WARN Write-Log -Info "Generating file test.txt." <nothing will be logged> Write-Log -Error "Failed to generate file test.txt." [E] 2017-05-19 11:14:28 [hostName/userName]: (scriptName/commandName/1) Failed to generate file test.txt. .EXAMPLE $Global.LogConfiguration.LogFile = 'log.txt' Write-Log -Info "Generating file test.txt." Logs message to stdout and log.txt file. .EXAMPLE $Global.LogConfiguration.LogEventLogSource = 'log.txt' $Global.LogConfiguration.LogEventLogThreshold = 'log.txt' Write-Log -Info "Generating file test.txt." #> [CmdletBinding()] [OutputType([void])] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidGlobalVars", '')] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingWriteHost", '')] param( # If specified, an error will be logged. [Parameter(Mandatory=$false)] [switch] $Error = $false, # If specified, a warning will be logged. [Parameter(Mandatory=$false)] [switch] $Warn = $false, # If specified, an info message will be logged (default). [Parameter(Mandatory=$false)] [switch] $Info = $false, # If specified, a debug message will be logged. [Parameter(Mandatory=$false)] [switch] $_debug = $false, # If set, the message at console will be emphasized using colors. [Parameter(Mandatory=$false)] [switch] $Emphasize = $false, # If specified, header information will not be logged (e.g. '[ERROR]: (function_name)'). [Parameter(Mandatory=$false)] [switch] $NoHeader = $false, # Message to output. [Parameter(Mandatory=$true, ValueFromPipeline=$true)] [string[]] $Message, # Additional indent. [Parameter(Mandatory=$false)] [int] $Indent = 0, # If enabled, all log output will be available as return value (will use Write-Output instead of Write-Host). [Parameter(Mandatory=$false)] [switch] $PassThru = $false ) Begin { if ($Error) { $severity = 3; $severityChar = 'E' } elseif ($warn) { $severity = 2; $severityChar = 'W' } elseif ($_debug) { $severity = 0; $severityChar = 'D' } else { $severity = 1; $severityChar = 'I' } if ($LogConfiguration) { switch ($LogConfiguration.LogLevel.ToUpper()[0]) { 'E' { $configSeverity = 3 } 'W' { $configSeverity = 2 } 'D' { $configSeverity = 0 } default { $configSeverity = 1 } } if ($severity -lt $configSeverity) { return } } $timestamp = Get-Date -Format 'yyyy-MM-dd HH:mm:ss' $callerInfo = (Get-PSCallStack)[1] $callerCommandName = $callerInfo.InvocationInfo.MyCommand.Name if ($callerInfo.ScriptName) { $callerScriptName = Split-Path -Leaf $callerInfo.ScriptName } else { $callerScriptName = 'no script'; } $callerLineNumber = $callerInfo.ScriptLineNumber $callerInfoString = "$callerScriptName/$callerCommandName/$callerLineNumber" if ($NoHeader) { $outputHeader = "" } else { $currentHostname = [system.environment]::MachineName $currentUsername = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name if (Get-Variable -Name PSSenderInfo -ErrorAction SilentlyContinue) { $remotingFlag = '[R] ' } else { $remotingFlag = '' } $outputHeader = "[$severityChar] $timestamp ${remotingFlag}[$currentHostname/${currentUsername}]: ($callerInfoString) " } $header = " " * $Indent + $outputHeader } Process { try { Write-LogToStdOut -Header $Header -Message $Message -Severity $Severity -Emphasize:$Emphasize Write-LogToFile -Header $Header -Message $Message -Severity $Severity Write-LogToEventLog -Header $Header -Message $Message -Severity $Severity Write-LogToPSOutput -Header $Header -Message $Message -Severity $Severity -PassThru:$PassThru } catch { $exception = $_.Exception $msg = "Writing to log failed - script will terminate.`r`n" $currentUsername = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name if ($LogConfiguration -and $LogConfiguration.LogFile) { $msg += "`r`nPlease ensure that current user ('{0}') has access to file '{1}' or change the path to log file in `$LogConfiguration.LogFile." -f $currentUsername, $LogConfiguration.LogFile } if ($LogConfiguration -and $LogConfiguration.LogEventLogSource) { $msg += "`r`nPlease ensure that current user ('{0}') is able to create Event Log sources or create the source manually." -f $currentUsername } $msg += "`n" + ($_ | Format-List -Force | Out-String) + ($exception | Format-List -Force | Out-String) Write-Host $msg [void](New-Item -Path "error.txt" -ItemType file -Value $msg -Force) throw "Logging failure" } } End { } } |