PsLogMessage.psm1
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function Get-ParamValueString { param ([string[]]$String) ForEach ($CurrentString in $String) { if ($CurrentString.Contains("'")) { "`"$CurrentString`"" } else { "'$CurrentString'" } } } function ConvertTo-DnsFqdn { # Output the results of a DNS lookup to the default DNS server for the specified # Wrapper for [System.Net.Dns]::GetHostByName([string]$ComputerName) param ( # DNS or NetBIOS hostname whose DNS FQDN to lookup [Parameter(Mandatory)] [string]$ComputerName, # Update the ThisFqdn cache instead of returning the Fqdn [switch]$ThisFqdn, # In-process cache to reduce calls to other processes or disk, and store repetitive parameters for better readability of code and logs [Parameter(Mandatory)] [ref]$Cache ) Write-LogMsg -Text "[System.Net.Dns]::GetHostByName('$ComputerName')" -Cache $Cache $Fqdn = [System.Net.Dns]::GetHostByName($ComputerName).HostName if ( $ThisFqdn ) { $Cache.Value['ThisFqdn'].Value = $Fqdn } return $Fqdn } function ConvertTo-PSCodeString { <# .SYNOPSIS Convert an object or array of objects into a code string which could be converted into a ScriptBlock with valid PowerShell syntax .DESCRIPTION Originally used for hashtables and arrays .INPUTS $InputObject parameter .OUTPUTS [System.String] Resulting PowerShell code #> [OutputType([System.String])] [CmdletBinding()] param ( # Object to convert to a PowerShell code string $InputObject ) if ($InputObject) { switch ($InputObject.GetType().FullName) { 'System.Collections.Hashtable' { $Strings = ForEach ($OriginalKey in $InputObject.Keys) { $Key = ConvertTo-PSCodeString -InputObject $OriginalKey $Value = ConvertTo-PSCodeString -InputObject $InputObject[$OriginalKey] "$Key=$Value" } "@{$($Strings -join ';')}" break } 'System.Object[]' { $Strings = ForEach ($Object in $InputObject) { ConvertTo-PSCodeString -InputObject $Object } "@($($Strings -join ','))" break } 'System.String' { if ($InputObject.Contains("'")) { $Value = $InputObject.Replace('"', '`"') "`"$Value`"" } else { "'$InputObject'" break } } 'System.Collections.Specialized.OrderedDictionary' { $Strings = ForEach ($OriginalKey in $InputObject.Keys) { $Key = ConvertTo-PSCodeString -InputObject $OriginalKey $Value = ConvertTo-PSCodeString -InputObject $InputObject[$OriginalKey] "$Key=$Value" } "@{$($Strings -join ';')}" break } default { "$InputObject" } } } else { "`$null" } } function Export-LogCsv { <# .SYNOPSIS Export a hashtable of log message objects to a CSV file. .DESCRIPTION Sort the log message objects by their Timestamp property. Export the log message objects to a CSV file. Write the file path to the Information stream. .INPUTS [System.String]$LogFile parameter .OUTPUTS None. The value of $LogFile is written to the Information stream. #> [OutputType([System.String])] [CmdletBinding()] param( # Log file to create [string]$LogFile, # In-process cache to reduce calls to other processes or disk, and store repetitive parameters for better readability of code and logs [Parameter(Mandatory)] [ref]$Cache ) Write-LogMsg -Cache $Cache -Text "`$Cache.Value['LogBuffer'].Value.GetEnumerator() | Export-Csv -Delimiter '$('`t')' -NoTypeInformation -LiteralPath '$LogFile'" $Cache.Value['LogBuffer'].Value.GetEnumerator() | Export-Csv -Delimiter "`t" -NoTypeInformation -LiteralPath $LogFile # Write the full path of the log file to the Information stream Write-Information $LogFile } function Get-CurrentHostName { # Future function to universally retrieve hostname using various methods (in order of preference): # hostname.exe # $env:hostname # CIM # other? } function Get-CurrentWhoAmI { # Output the results of whoami.exe after editing them to correct capitalization of both the hostname and the account name # whoami.exe returns lowercase but we want to honor the correct capitalization # Correct capitalization is returned from $ENV:USERNAME param ( <# Hostname of the computer running this function. Can be provided as a string to avoid calls to HOSTNAME.EXE #> [string]$ThisHostName = (HOSTNAME.EXE), # Username to record in log messages (can be passed to Write-LogMsg as a parameter to avoid calling an external process) [string]$WhoAmI = (whoami.EXE) ) $WhoAmI -replace "^$ThisHostname\\", "$ThisHostname\" -replace "$ENV:USERNAME", $ENV:USERNAME } function Get-ParamStringMap { return @{ 'System.Collections.Hashtable' = { param ($ParamName, $ParamValue) "`$$ParamName" } 'System.Collections.Hashtable+SyncHashtable' = { param ($ParamName, $ParamValue) "`$$ParamName" } 'System.Int32' = { param ($ParamName, $ParamValue) "($ParamValue)" # paren to encapsulate negative values } 'System.UInt16' = { param ($ParamName, $ParamValue) "($ParamValue)" # paren to encapsulate negative values } 'System.Object[]' = { param ($ParamName, $ParamValue) "@('$($ParamValue -join "','")')" } 'System.String[]' = { param ($ParamName, $ParamValue) $NewValues = Get-ParamValueString -String $ParamValue "@($($NewValues -join ','))" } 'System.Management.Automation.PSCustomObject' = { param ($ParamName, $ParamValue) "[PSCustomObject]$ParamValue" } 'System.String' = { param ($ParamName, $ParamValue) Get-ParamValueString -String $ParamValue } 'System.Boolean' = { param ($ParamName, $ParamValue) "`$$ParamValue" } 'System.Management.Automation.SwitchParameter' = { param ($ParamName, $ParamValue) "`$$ParamValue" } 'System.Management.Automation.ScriptBlock' = { param ($ParamName, $ParamValue) "{$ParamValue}" } } } function New-DatedSubfolder { # Creates a folder structure with a folder for each year and month # Then it creates one timestamped folder inside the appropriate month # This folder is intended to be used to store output from a single execution of a script param ( [parameter(Mandatory)] [string]$Root, # A suffix to append to the folder name [string]$Suffix ) $Year = Get-Date -Format 'yyyy' $Month = Get-Date -Format 'MM' $Timestamp = (Get-Date -Format s) -replace ':', '-' $NewDir = "$Root\$Year\$Month\$Timestamp$Suffix" $null = New-Item -ItemType Directory -Path $NewDir -ErrorAction SilentlyContinue Write-Output $NewDir } function Write-LogMsg { <# .SYNOPSIS Prepend a prefix to a log message, write the message to an output stream, and write the message to a text file. Writes a message to a log file and/or PowerShell output stream .DESCRIPTION Prepends the log message with: a current timestamp the current hostname the current username the current command (function or file name) the current location (line number in the code) Tab-delimits these fields for a compromise between readability and parseability Adds the log message to a ConcurrentQueue which was passed to the $Buffer parameter Optionally writes the message to a log file Optionally writes the message to a PowerShell output stream .INPUTS [System.String[]]$Text parameter .OUTPUTS [System.String] Resulting log line, returned if the -PassThru or -Type Output parameters were used #> [OutputType([System.String])] [CmdletBinding()] param( # Message to log [Parameter(Position = 0, ValueFromPipeline)] [string[]]$Text, # Suffix to append to the end of the string [string]$Suffix, # Add a prefix to the message including the date, hostname, current user, and info about the current call stack [bool]$AddPrefix = $true, # Text file to append the log message to [string]$LogFile, # Output the message to the pipeline [bool]$PassThru = $false, <# Splats for the command at the end of the -Text parameter. E.g. Write-LogMsg -Text 'Get-Process' -Expand @{Name = 'explorer'} Has a resultant $Text value of: Get-Process -Name explorer #> [hashtable[]]$Expand, # Output stream to send the message to [Parameter(ParameterSetName = 'NoCache')] [ValidateSet('Silent', 'Quiet', 'Success', 'Debug', 'Verbose', 'Output', 'Host', 'Warning', 'Error', 'Information', $null)] [string]$Type, # Hostname to use in the log messages and/or output object [Parameter(ParameterSetName = 'NoCache')] [string]$ThisHostname, # Hostname to use in the log messages and/or output object [Parameter(ParameterSetName = 'NoCache')] [string]$WhoAmI, # Log messages which have not yet been written to disk [Parameter(Mandatory, ParameterSetName = 'NoCache')] [ref]$Buffer, # Used to override key-value pairs in the Expand parameter. [Parameter(ParameterSetName = 'NoCache')] [hashtable]$ExpandKeyMap, [Parameter(ParameterSetName = 'NoCache')] [hashtable]$ParamStringMap, # In-process cache to reduce calls to other processes or disk, and store repetitive parameters for better readability of code and logs [Parameter(Mandatory, ParameterSetName = 'Cache')] [ref]$Cache, # Used to override key-value pairs in the Expand parameter. [Parameter(ParameterSetName = 'Cache')] [hashtable]$ExpansionMap = $Cache.Value['LogEmptyMap'].Value ) begin { # This will ensure the message is not written to any PowerShell output streams or log files if ($Type -eq 'Silent') { return } $Timestamp = Get-Date -Format 'yyyy-MM-ddTHH:mm:ss.ffffK' $OutputToPipeline = $false $PSCallStack = Get-PSCallStack $Caller = $PSCallStack[1] $Location = $Caller.Location $Command = $Caller.Command if ($PSCmdlet.ParameterSetName -eq 'Cache') { [string]$Type = $Cache.Value['LogType'].Value [string]$ThisHostname = $Cache.Value['ThisHostname'].Value [string]$WhoAmI = $Cache.Value['WhoAmI'].Value [ref]$Buffer = $Cache.Value['LogBuffer'] [hashtable]$ParamStringMap = $Cache.Value['ParamStringMap'].Value [hashtable]$ExpandKeyMap = $ExpansionMap } else { if (-not $PSBoundParameters.ContainsKey('Type')) { $Type = 'Information' } if (-not $PSBoundParameters.ContainsKey('ThisHostname')) { $ThisHostname = HOSTNAME.EXE } if (-not $PSBoundParameters.ContainsKey('WhoAmI')) { $WhoAmI = whoami.EXE } if (-not $PSBoundParameters.ContainsKey('ExpandKeyMap')) { $ExpandKeyMap = @{} } if (-not $PSBoundParameters.ContainsKey('ParamStringMap')) { $ParamStringMap = Get-ParamStringMap } } } process { ForEach ($String in $Text) { ForEach ($Splat in $Expand) { ForEach ($ParamName in $Splat.Keys) { $ParamValue = $ExpandKeyMap[$ParamName] if ($null -eq $ParamValue) { $ParamValue = $Splat[$ParamName] if ($null -ne $ParamValue) { $TypeName = $ParamValue.GetType().FullName $ValueScript = $ParamStringMap[$TypeName] if ($ValueScript) { $ParamValue = Invoke-Command -Command $ValueScript -ArgumentList $ParamName, $ParamValue } else { $ParamValue = "'$ParamValue'" } } else { # Hopefully this skips appending this parameter but I'm not sure it will 'continue' in the right ForEach scope due to the nesting continue } } $String = "$String -$ParamName $ParamValue" } } $FullText = "$String$Suffix" if ($AddPrefix) { # This method is faster than StringBuilder or the -join operator $MessageToLog = "$Timestamp`t$ThisHostname`t$WhoAmI`t$Location`t$Command`t$($MyInvocation.ScriptLineNumber)`t$Type`t$FullText" } else { $MessageToLog = $FullText } Switch ($Type) { # This will ensure the message is added to log files, but not written to any PowerShell output streams 'Quiet' { break } # This one is made-up to correspond with the 'success' contextual class in Bootstrap. 'Success' { Write-Information "SUCCESS: $MessageToLog" ; break } # These represent normal PowerShell output streams # The correct number of spaces should be added to maintain proper column alignment 'Debug' { Write-Debug " $MessageToLog" ; break } 'Verbose' { Write-Verbose $MessageToLog ; break } 'Host' { Write-Host "HOST: $MessageToLog" ; break } 'Warning' { Write-Warning $MessageToLog ; break } 'Error' { Write-Error $MessageToLog ; break } 'Output' { $OutputToPipeline = $true ; break } default { Write-Information "INFO: $MessageToLog" ; break } } if ($PSBoundParameters.ContainsKey('LogFile')) { $MessageToLog | Out-File $LogFile -Append } if ($PassThru -or $OutputToPipeline) { $MessageToLog } $Obj = [ordered]@{ Timestamp = $Timestamp Hostname = $ThisHostname WhoAmI = $WhoAmI Location = $Location Command = $Command Line = $MyInvocation.ScriptLineNumber Type = $Type Text = $FullText } $null = $Buffer.Value.Enqueue($Obj) } } } <# # Add any custom C# classes as usable (exported) types $CSharpFiles = Get-ChildItem -Path "$PSScriptRoot\*.cs" ForEach ($ThisFile in $CSharpFiles) { Add-Type -Path $ThisFile.FullName -ErrorAction Stop } #> Export-ModuleMember -Function @('ConvertTo-DnsFqdn','ConvertTo-PSCodeString','Export-LogCsv','Get-CurrentHostname','Get-CurrentWhoAmI','Get-ParamStringMap','New-DatedSubfolder','Write-LogMsg') |