Obs/bin/ObsDep/content/Powershell/ObservabilityCensusHelpers.psm1

<###################################################
 # #
 # Copyright (c) Microsoft. All rights reserved. #
 # #
 ##################################################>


# Import Observability EventSource
$observabilityNugetPath = "$PSScriptRoot\..\.."
Add-Type -Path "$observabilityNugetPath\lib\net472\Microsoft.AzureStack.Observability.ObservabilityDeployment.dll"

# Census event scheduled task with retries.
function Set-CensusTaskWithRetry
{
    $retryAttempt = 0
    $retrySleepTimeInSeconds = 10
    $Retries = 5
    $success = $false
    while(-not($success) -and ($retryAttempt -lt $Retries))
    {
        $retryAttempt = $retryAttempt + 1
        try
        {
            Write-InfoLog "Trying to setup census events scheduled task. Attempt $retryAttempt of $Retries"
            Set-CensusEventTask
            $success = $true
        }
        catch
        {
            if ($retryAttempt -lt $Retries)
            {
                $exceptionMessage = $_.Exception.Message
                Write-ErrorLog "Failure during census events scheduled task setup: '$exceptionMessage'. Retrying."
            }
            else
            {
                # All retries failed.
                return $_
            }
            Start-Sleep -Seconds $retrySleepTimeInSeconds
        }
    }
    return $true
}

# Registration events one-time task with retries.
function Set-RegistrationEventsTaskWithRetry
{
    $retryAttempt = 0
    $retrySleepTimeInSeconds = 10
    $Retries = 5
    $success = $false
    while(-not($success) -and ($retryAttempt -lt $Retries))
    {
        $retryAttempt = $retryAttempt + 1
        try
        {
            Write-InfoLog "Trying to setup registration events one-time task. Attempt $retryAttempt of $Retries"
            Set-RegistrationEventTask
            $success = $true
        }
        catch
        {
            if ($retryAttempt -lt $Retries)
            {
                $exceptionMessage = $_.Exception.Message
                Write-ErrorLog "Failure during registration events one-time task setup: '$exceptionMessage'. Retrying."
            }
            else
            {
                # All retries failed.
                return $_
            }
            Start-Sleep -Seconds $retrySleepTimeInSeconds
        }
    }
    return $true
}

# Create the census events scheduled task.
function Set-CensusEventTask
{
    $observabilityNugetPath = "$PSScriptRoot\..\.."
    $censusObservabilityPath = "$observabilityNugetPath\content\Powershell\ObservabilityCensus.ps1"

    # Create the scheduled task to generate census events using HCI CensusDiagnosticProvider.
    $taskName = "ObservabilityCensus"
    if(Test-ScheduledTaskExists -TaskName $taskName)
    {
        Write-InfoLog "Existing task found. Cleaning up task $taskName."    
        Unregister-ScheduledTask -TaskName $taskName -Confirm:$false -Verbose | Out-Null
    }

    Write-InfoLog "Creating new scheduled task $taskName."
    $frequency = New-TimeSpan -Hours 24
    $principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount
    $trigger = New-ScheduledTaskTrigger -Once -RepetitionInterval $frequency -At (Get-Date).AddMinutes(60) -RepetitionDuration (([DateTime]::Now).AddYears(10) - [DateTime]::Now)
    $action = New-ScheduledTaskAction `
        -Execute "powershell.exe"  `
        -Argument "-Command $censusObservabilityPath"
    $settings = New-ScheduledTaskSettingsSet 
    $task = New-ScheduledTask -Action $action -Trigger $trigger -Settings $settings -Principal $principal
    Register-ScheduledTask -TaskName $taskName -TaskPath "Microsoft\AzureStack\Observability" -InputObject $task
    Write-InfoLog "Creating new scheduled task $taskName succeeded."
}

# Create the registration events one-time task.
function Set-RegistrationEventTask
{
    $observabilityNugetPath = "$PSScriptRoot\..\.."
    $registrationObservabilityPath = "$observabilityNugetPath\content\Powershell\ObservabilityCensusRegistration.ps1"

    # Create the one-time task to gather registration events using HCI CensusDiagnosticProvider.
    $taskName = "ObservabilityRegistrationCensus"
    if(Test-ScheduledTaskExists -TaskName $taskName)
    {
        Unregister-ScheduledTask -TaskName $taskName -Confirm:$false -Verbose | Out-Null
    }

    Write-InfoLog "Creating new scheduled task $taskName."
    $principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount
    $trigger = New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(60)
    $action = New-ScheduledTaskAction `
        -Execute "powershell.exe"  `
        -Argument "-Command $registrationObservabilityPath"
    $settings = New-ScheduledTaskSettingsSet 
    $task = New-ScheduledTask -Action $action -Trigger $trigger -Settings $settings -Principal $principal
    Register-ScheduledTask -TaskName $taskName -TaskPath "Microsoft\AzureStack\Observability" -InputObject $task
    Write-InfoLog "Creating new scheduled task $taskName succeeded."
}

# Returns true if a given task exists and false otherwise.
function Test-ScheduledTaskExists
{
    param(
        [string]
        [Parameter(Mandatory=$true)] 
        $TaskName
    )
    try
    {
        if(Get-ScheduledTask -TaskName $TaskName -ErrorAction Stop)
        {
            return $true
        }
    }
    catch {}
    return $false
}

# Write census event.
function Write-CensusEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing census event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteCensusEvent($eventString)
}

# Write registration event.
function Write-RegistrationEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $EventName,
        [string]
        [Parameter(Mandatory=$true)]
        $Message
    )

    Write-InfoLog "Writing $EventName event for node: $NodeName"
    switch($EventName)
    {
            "ClusterRegistrationStart" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteClusterRegistrationStart($Message); break}
            "ArcRegistrationStart" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteArcRegistrationStart($Message); break}
            "ArcRegistrationEnd" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteArcRegistrationEnd($Message); break}
            "ClusterRegistrationEnd" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteClusterRegistrationEnd($Message); break}
            "ClusterRegistrationParameters" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteClusterRegistrationParameters($Message); break}
            "ClusterRegistrationFailure" {[Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteClusterRegistrationFailure($Message); break}
    }
}

function Write-ClusterPropertiesEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing census event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteClusterPropertiesEvent($eventString)
}

function Write-InstalledWin32ProgramListEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing InstalledWin32ProgramList event for node $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteInstalledWin32ProgramListEvent($eventString)
}

function Write-PhysicalDiskListEvent {
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing physical disk list for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WritePhysicalDiskListEvent($eventString)
}

function Write-VirtualDiskListEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing VirtualDiskList event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteVirtualDiskListEvent($eventString)
}

function Write-StoragePoolListEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing StoragePoolList event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteStoragePoolListEvent($eventString)
}

function Write-StorageTierListEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing StorageTierList event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteStorageTierListEvent($eventString)
}

function Write-StorageSubSystemListEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing StorageSubSystemList event for node: $NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteStorageSubSystemListEvent($eventString)
}

function Write-DisasterRecoveryEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing DisasterRecovery event for node :$NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteDisasterRecoveryEvent($eventString)
}

function Write-SddcVolumeSummaryEvent
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $eventString
    )
    Write-InfoLog "Writing SddcVolumeSummary event for node :$NodeName"
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteSddcVolumeSummaryEvent($eventString)
}

function Write-InfoLog
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $Message
    )
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteInformational($Message)
}

function Write-ErrorLog
{
    param(
        [string]
        [Parameter(Mandatory=$true)]
        $Message
    )
    [Microsoft.AzureStack.Observability.CensusEventSource]::Instance.WriteError($Message)
}

Export-ModuleMember -Function Set-CensusTaskWithRetry
Export-ModuleMember -Function Set-RegistrationEventsTaskWithRetry
Export-ModuleMember -Function Write-CensusEvent
Export-ModuleMember -Function Write-RegistrationEvent
Export-ModuleMember -Function Write-ClusterPropertiesEvent
Export-ModuleMember -Function Write-InstalledWin32ProgramListEvent
Export-ModuleMember -Function Write-PhysicalDiskListEvent
Export-ModuleMember -Function Write-VirtualDiskListEvent
Export-ModuleMember -Function Write-StoragePoolListEvent
Export-ModuleMember -Function Write-StorageTierListEvent
Export-ModuleMember -Function Write-StorageSubSystemListEvent
Export-ModuleMember -Function Write-DisasterRecoveryEvent
Export-ModuleMember -Function Write-SddcVolumeSummaryEvent
Export-ModuleMember -Function Write-ErrorLog
Export-ModuleMember -Function Write-InfoLog
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