Obs/scripts/ObservabilityDeploymentHelper.psm1

##------------------------------------------------------------------
## <copyright file="ObservabilityDeploymentHelper.psm1" company="Microsoft">
## Copyright (C) Microsoft. All rights reserved.
## </copyright>
##------------------------------------------------------------------

#region Imports
Import-Module (Join-Path -Path $PSScriptRoot -ChildPath 'ExtensionHelper.psm1') `
    -DisableNameChecking `
    -Verbose:$false

Import-Module (Join-Path -Path $global:ObsArtifactsPaths.GMA -ChildPath 'GMATenantJsonHelper.psm1') `
    -DisableNameChecking `
    -Verbose:$false
#endregion Imports

#region Constants

$PublisherRegex = "Microsoft\.AzureStack\.Observability\.ObservabilityDeployment\.([\w+-]+)\.etwManifest.man"
$EventSourceLogSizeInBytes = 16777216
$ObservabilityDeploymentPath = Get-ObservabilityDeploymentPackagePath
$ObservabilityVhdFileName = "Observability.vhdx"
$AccessPath = "$env:SystemDrive\Observability"
$CleanupThresholdPercent = 90
$FreeSpaceThresholdPercent = 80
$PurgeFolderFrequencyInMinutes = 10
$SubFolderConfigFileName = "ObservabilityFoldersHost.json"
$ObservabilityScheduledTaskPath = "\Microsoft\AzureStack\Observability\"
$ObservabilityDeploymentScheduledTasks = @(
    'MountObservabilityVolume',
    'ObservabilityCensus',
    'ObservabilityRegistrationCensus',
    'ObservabilityUptime',
    'ObservabilityVolumePruner',
    'ObservabilityVolumeQuotaStatistics'
)

#endregion Constants


#region Functions

function Register-ObservabilityEventSources
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name
    Write-Log "[$functionName] Entering." -LogFile $LogFile

    $manifests = (Get-ChildItem "$ObservabilityDeploymentPath\lib\net472\*.etwManifest.man").FullName
    foreach ($manifest in $manifests)
    {
        $manifestDllPath = $manifest -creplace 'man', 'dll'
        $match = Select-String $PublisherRegex -InputObject $manifest
        $publisherName = $match.Matches.Groups[1].Value
        $eventSourceLogName = "$publisherName/Operational"
        
        Write-Log "[$functionName] Granting read only access for everyone to $manifest and $manifestDllPath" -LogFile $LogFile
        Write-Log "[$functionName] $(icacls $manifest /grant Everyone:R)" -LogFile $LogFile
        Write-Log "[$functionName] $(icacls $manifestDllPath /grant Everyone:R)" -LogFile $LogFile
        
        $publisherList = wevtutil ep
        if($publisherList.Contains($publisherName))
        {
            Write-Log "[$functionName] Publisher $publisherName already exists. Uninstalling." -LogFile $LogFile
            Write-Log "[$functionName] $(wevtutil uninstall-manifest $manifest /resourceFilePath:"$manifestdllPath" /messageFilePath:"$manifestDllPath")" -LogFile $LogFile
            Write-Log "[$functionName] Successfully unregistered publisher $publisherName." -LogFile $LogFile
        }

        Write-Log "[$functionName] wevtutil installing manifest $manifest with resourceFilePath and messageFilePath $manifestDllPath" -LogFile $LogFile
        Write-Log "[$functionName] $(wevtutil install-manifest $manifest /resourceFilePath:"$manifestdllPath" /messageFilePath:"$manifestDllPath")" -LogFile $LogFile

        Write-Log "[$functionName] wevtutil setting $eventSourceLogName log size to $EventSourceLogSizeInBytes" -LogFile $LogFile
        Write-Log "[$functionName] $(wevtutil set-log $eventSourceLogName /MaxSize:"$EventSourceLogSizeInBytes")" -LogFile $LogFile
    }
    Write-Log "[$functionName] Exiting." -LogFile $LogFile
}



function Unregister-ObservabilityEventSources
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name
    Write-Log "[$functionName] Entering." -LogFile $LogFile

    try {
        $manifests = (Get-ChildItem "$ObservabilityDeploymentPath\lib\net472\*.etwManifest.man").FullName
        foreach ($manifest in $manifests)
        {
            $manifestDllPath = $manifest -creplace 'man', 'dll'
            $match = Select-String $PublisherRegex -InputObject $manifest
            $publisherName = $match.Matches.Groups[1].Value
            
            Write-Log "[$functionName] Granting read only access for everyone to $manifest and $manifestDllPath" -LogFile $LogFile
            Write-Log "[$functionName] $(icacls $manifest /grant Everyone:R)" -LogFile $LogFile
            Write-Log "[$functionName] $(icacls $manifestDllPath /grant Everyone:R)" -LogFile $LogFile
            
            $publisherList = wevtutil ep
            if($publisherList.Contains($publisherName))
            {
                Write-Log "[$functionName] Publisher $publisherName is registered. Unregistering." -LogFile $LogFile
                Write-Log "[$functionName] $(wevtutil uninstall-manifest $manifest /resourceFilePath:"$manifestdllPath" /messageFilePath:"$manifestDllPath")" -LogFile $LogFile
                Write-Log "[$functionName] Successfully unregistered publisher $publisherName." -LogFile $LogFile
            }
            else {
                Write-Log "[$functionName] Publisher $publisherName for manifest ($manifest) was not registered only." -LogFile $LogFile
            }
        }
    }
    catch {
        $exceptionDetails = Get-ExceptionDetails -ErrorObject $_
        ## Making this as a non-terminating error in case there are exceptions here.
        Write-Log "[$functionName] Failed due to exception: $exceptionDetails." -LogFile $LogFile -Level $MiscConstants.Level.Warning
    }
    Write-Log "[$functionName] Exiting." -LogFile $LogFile
}

function Set-ObservabilityDeploymentScheduledTasks
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name

    Import-Module "$ObservabilityDeploymentPath\content\Powershell\ObservabilityHelpers.psm1" -DisableNameChecking
    Import-Module "$ObservabilityDeploymentPath\content\Powershell\ObservabilityUptimeHelpers.psm1" -DisableNameChecking
    Import-Module "$ObservabilityDeploymentPath\content\Powershell\ObservabilityCensusHelpers.psm1"

    $observabilityVhdPath = Get-ObservabilityVhdFileIfExists -LogFile $LogFile
    if ($observabilityVhdPath)
    {
        Write-Log -Message "$functionName : Registering scheduledtask MountObservabilityVolume." -LogFile $LogFile
        Add-MountVolumeScheduledTask -Path $observabilityVhdPath | Out-Null
        Write-Log -Message "$functionName : Successfully registered scheduledtask MountObservabilityVolume." -LogFile $LogFile
    }


    Write-Log -Message "$functionName : Registering scheduled task ObservabilityUptime." -LogFile $LogFile
    Set-UptimeTaskWithRetry | Out-Null
    Write-Log -Message "$functionName : Successfully registered scheduled task ObservabilityUptime." -LogFile $LogFile

    Write-Log -Message "$functionName : Registering scheduled task ObservabilityRegistrationCensus." -LogFile $LogFile
    Set-RegistrationEventsTaskWithRetry | Out-Null
    Write-Log -Message "$functionName : Successfully registered scheduled task ObservabilityRegistrationCensus." -LogFile $LogFile

    Write-Log -Message "$functionName : Registering scheduled task ObservabilityCensus." -LogFile $LogFile
    Set-CensusTaskWithRetry | Out-Null
    Write-Log -Message "$functionName : Successfully registered scheduled task ObservabilityCensus." -LogFile $LogFile

    Write-Log -Message "$functionName : Registering scheduled tasks ObservabilityVolumePruner and ObservabilityVolumeQuotaStatistics." -LogFile $LogFile
    New-VolumeFoldersAndPrunerWithRetry `
        -AccessPath $AccessPath `
        -CleanupThresholdPercent $CleanupThresholdPercent `
        -FreeSpaceThresholdPercent $FreeSpaceThresholdPercent `
        -PurgeFolderFrequencyInMinutes $PurgeFolderFrequencyInMinutes `
        -SubFolderConfigFileName $SubFolderConfigFileName | Out-Null
    Write-Log -Message "$functionName : Successfully registered scheduled tasks ObservabilityVolumePruner and ObservabilityVolumeQuotaStatistics." -LogFile $LogFile

    Disable-ObservabilityDeploymentScheduledTasks -LogFile $LogFile
}

function Enable-ObservabilityDeploymentScheduledTasks
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name

    foreach($taskName in $ObservabilityDeploymentScheduledTasks)
    {
        $task = ScheduledTasks\Get-ScheduledTask `
            -TaskPath $ObservabilityScheduledTaskPath `
            -TaskName $taskName `
            -ErrorAction $MiscConstants.ErrorActionPreference.SilentlyContinue
        if ($null -eq $task)
        {
            Write-Log `
                -Message "$functionName : No scheduled task with name $taskName was found to enable." `
                -LogFile $LogFile
        }
        else {
            ScheduledTasks\Enable-ScheduledTask `
                -InputObject $task `
                -ErrorAction $MiscConstants.ErrorActionPreference.Stop `
                -Verbose:$false `
                | Out-Null
            Write-Log `
                -Message "$functionName : Successfully enabled obs scheduled task with name name $($task.TaskName) at path $($task.TaskPath)." `
                -LogFile $LogFile
        }
    }
}

function Disable-ObservabilityDeploymentScheduledTasks
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name

    foreach($taskName in $ObservabilityDeploymentScheduledTasks)
    {
        $task = ScheduledTasks\Get-ScheduledTask `
            -TaskPath $ObservabilityScheduledTaskPath `
            -TaskName $taskName `
            -ErrorAction $MiscConstants.ErrorActionPreference.SilentlyContinue
        if ($null -eq $task)
        {
            Write-Log `
                -Message "$functionName : No scheduled task with name $taskName was found to disable." `
                -LogFile $LogFile
        }
        else {
            ScheduledTasks\Disable-ScheduledTask `
                -InputObject $task `
                -ErrorAction $MiscConstants.ErrorActionPreference.Stop `
                -Verbose:$false `
                | Out-Null
            Write-Log `
                -Message "$functionName : Successfully disabled obs scheduled task with name $($task.TaskName) at path $($task.TaskPath)." `
                -LogFile $LogFile
        }
    }
}

function Unregister-ObservabilityDeploymentScheduledTasks
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name

    foreach($taskName in $ObservabilityDeploymentScheduledTasks)
    {
        $task = ScheduledTasks\Get-ScheduledTask `
            -TaskPath $ObservabilityScheduledTaskPath `
            -TaskName $taskName `
            -ErrorAction $MiscConstants.ErrorActionPreference.SilentlyContinue
        if ($null -eq $task)
        {
            Write-Log `
                -Message "$functionName : No scheduled task with name $taskName was found to unregister." `
                -LogFile $LogFile
        }
        else {
            ScheduledTasks\Unregister-ScheduledTask `
                -InputObject $task `
                -ErrorAction $MiscConstants.ErrorActionPreference.Stop `
                -Verbose:$false `
                -Confirm:$false `
                | Out-Null
            Write-Log `
                -Message "$functionName : Successfully unregistered obs scheduled task with name $($task.TaskName) at path $($task.TaskPath)." `
                -LogFile $LogFile
        }
    }
}

function Get-ObservabilityVhdFileIfExists
{
    Param (
        [Parameter(Mandatory = $False)]
        [System.String] $LogFile
    )
    $functionName = $MyInvocation.MyCommand.Name

    Write-Log `
        -Message "[$functionName] Entering." `
        -LogFile $LogFile

    $letterDrives = (Get-PSDrive).Name -match '^[a-z]$'
    foreach($drive in $letterDrives)
    {
        $vhdPath = Join-Path "$($drive):" -ChildPath $ObservabilityVhdFileName
        if (Test-Path $vhdPath)
        {
            Write-Log `
                -Message "[$functionName] Found Observability volume at $vhdPath." `
                -LogFile $LogFile
            return $vhdPath
        }
    }
    Write-Log `
        -Message "[$functionName] No $ObservabilityVhdFileName file found." `
        -LogFile $LogFile
    return $false
}

#endregion Functions

#region Exports
Export-ModuleMember -Function Disable-ObservabilityDeploymentScheduledTasks
Export-ModuleMember -Function Enable-ObservabilityDeploymentScheduledTasks
Export-ModuleMember -Function Register-ObservabilityEventSources
Export-ModuleMember -Function Set-ObservabilityDeploymentScheduledTasks
Export-ModuleMember -Function Unregister-ObservabilityDeploymentScheduledTasks
Export-ModuleMember -Function Unregister-ObservabilityEventSources
#endregion Exports
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