Compress-IISLogs

1.0

Compress-IISLogs.ps1

<#PSScriptInfo
.VERSION 1.0
.GUID cd35b292-e0b9-4a6e-9cb5-94345e5a5108
.AUTHOR Vasily Larionov
.COMPANYNAME
.COPYRIGHT
.TAGS Compress,Log
.LICENSEURI
.PROJECTURI https://github.com/vlariono/posh-scripts
.ICONURI
.EXTERNALMODULEDEPENDENCIES
.REQUIREDSCRIPTS
.EXTERNALSCRIPTDEPENDENCIES
.RELEASENOTES
#>

<#
.SYNOPSIS
Performs gzip compression of IIS logs
.DESCRIPTION
Rotates IIS logs. Reads original logs from source directory and saves compressed logs to destination directory. The original files will be deleted after compression. The script won't rotate files which have been modified today.
.PARAMETER SourceDirectory
Source directory to read files from
.PARAMETER DestinationDirectory
Destination directory to write archives to
.EXAMPLE
.\Compress-IISLogs.ps1 -SourceDirectory D:\Log -DestinationDirectory D:\Archive
#>

#region Params
param(
    [Parameter(Position=0, Mandatory=$true)]
    [ValidateScript({Test-Path -Path $_ -PathType 'container'})]
    [System.String]
    $SourceDirectory,
    [Parameter(Position=1, Mandatory=$true)]
    [ValidateNotNullOrEmpty()]
    [System.String]
    $DestinationDirectory
)
#endregion

function Compress-File{
    #region Params
    param(
        [Parameter(Position=0, Mandatory=$true)]
        [ValidateScript({Test-Path -Path $_ -PathType 'leaf'})]
        [System.String]
        $InputFile,
        [Parameter(Position=1, Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [System.String]
        $OutputFile
    )
    #endregion

    try{
        #Creating buffer with size 8MB
        $bytesGZipFileBuffer = New-Object -TypeName byte[](8192)

        $streamGZipFileInput = New-Object -TypeName System.IO.FileStream($InputFile,[System.IO.FileMode]::Open,[System.IO.FileAccess]::Read)
        $streamGZipFileOutput = New-Object -TypeName System.IO.FileStream($OutputFile,[System.IO.FileMode]::Create,[System.IO.FileAccess]::Write)
        $streamGZipFileArchive = New-Object -TypeName System.IO.Compression.GZipStream($streamGZipFileOutput,[System.IO.Compression.CompressionMode]::Compress)

        for($iBytes = $streamGZipFileInput.Read($bytesGZipFileBuffer, 0,$bytesGZipFileBuffer.Count);
            $iBytes -gt 0;
            $iBytes = $streamGZipFileInput.Read($bytesGZipFileBuffer, 0,$bytesGZipFileBuffer.Count)){

            $streamGZipFileArchive.Write($bytesGZipFileBuffer,0,$iBytes)
        }

        $streamGZipFileArchive.Dispose()
        $streamGZipFileInput.Close()
        $streamGZipFileOutput.Close()

        Get-Item $OutputFile
    }
    catch { throw $_ }
}


Get-ChildItem -Path $SourceDirectory -Recurse -Exclude "*.gz"|ForEach-Object{
    if($($_.Attributes -band [System.IO.FileAttributes]::Directory) -ne [System.IO.FileAttributes]::Directory){
        #Current file
        $curFile = $_

        #Check the file wasn't modified today
        if($curFile.LastWriteTime.Date -ne [System.DateTime]::Today){

            $containedDir=$curFile.Directory.FullName.Replace($SourceDirectory,$DestinationDirectory)

            #if target directory doesn't exist - create
            if($(Test-Path -Path "$containedDir") -eq $false){
                New-Item -Path "$containedDir" -ItemType directory
            }

            Write-Host $("Archiving " + $curFile.FullName)
            Compress-File -InputFile $curFile.FullName -OutputFile $("$containedDir\" + $curFile.Name + ".gz")
            Remove-Item -Path $curFile.FullName
        }
    }
}