PSCloudFormation

0.5.0

Private/Wait-PSCFNStack.ps1

function Wait-PSCFNStack
{
    <#
    .SYNOPSIS
        Wait for a stack to do something, printing events along the way.

    .PARAMETER StackArn
        Stack(s) to wait on.

    .PARAMETER CredentialArguments
        Hash of common credetial and region arguments.

    .PARAMETER StartTime
        Time the stack update command was issued

    .OUTPUTS
        [bool] true if operation succeeded; else false
#>
    param
    (
        [string[]]$StackArn,

        [hashtable]$CredentialArguments,

        [DateTime]$StartTime
    )

    $checkTime = $StartTime

    # Copy input array so as not to trash it.
    $arns = $StackArn |
    Foreach-Object {
        $_
    }

    # States indicating any stack operation complete
    $completionStates = @(
        'CREATE_COMPLETE'
        'CREATE_FAILED'
        'DELETE_COMPLETE'
        'DELETE_FAILED'
        'ROLLBACK_COMPLETE'
        'ROLLBACK_FAILED'
        'UPDATE_COMPLETE'
        'UPDATE_ROLLBACK_COMPLETE'
        'UPDATE_ROLLBACK_FAILED'
    )

    $anyFailed = $false

    $writeHeaders = $true

    while (($arns | Measure-Object).Count -gt 0)
    {
        Start-Sleep -Seconds 10

        $stacks = $arns |
            Foreach-Object {

            Get-CFNStack -StackName $_ @CredentialArguments
        }

        $completedStackArns = $stacks |
            Where-Object {

            if ($_.StackStatus -ilike '*ROLLBACK*' -or $_.StackStatus -ilike '*FAILED*')
            {
                $anyFailed = $true
            }

            $completionStates -icontains $_.StackStatus
        } |
            Select-Object -ExpandProperty StackId

        if ($completedStackArns)
        {
            $arns = Compare-Object -ReferenceObject $arns -DifferenceObject $completedStackArns -PassThru
        }

        $ts = Write-StackEvents -StackArn $arns -EventsAfter $checkTime $CredentialArguments -WriteHeaders $writeHeaders
        $writeHeaders = $false

        if ($ts)
        {
            $checkTime = $ts
        }
    }

    Write-StackEvents -StackArn $StackArn -EventsAfter $checkTime $CredentialArguments -WriteHeaders $false

    # Output boolean - any final state containing ROLLBACK or FAILED indicates operation unsuccessful
    -not $anyFailed
}