Powershell Modules

Exponential Back-off with Powershell.md

Usage:

Place ExponentialBackoff.psm1 file along with your powershell script and pass commands to Exponential Back Off function.

using module ".\ExponentialBackoff.psm1" 

Use-ExponentialBackoff -ScriptBlock { Your script here. }

Use-ExponentialBackoff.psm1

function Use-ExponentialBackoff {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [scriptblock]
        $ScriptBlock,

        [Parameter(Mandatory = $false)]
        [int]
        [ValidateRange(1, 100)]
        $MaxRetries = 10,

        [Parameter(Mandatory = $false)]
        [int]
        [ValidateRange(2, 1024)]
        $MaxRetryDelay = 128
    )

    $retryCount = 0
    while ($true) {
        try{
            . $ScriptBlock -ErrorAction Stop
            break
        }
        catch {
            if($retryCount++ -lt $MaxRetries) {
                $sleeptime = If($sleeptime -lt $MaxRetryDelay) { ([Math]::Pow(2, $retryCount)) } Else { $sleeptime }
                Write-Host "$($_.exception) `nRetry $retryCount after $sleeptime seconds"

                Start-Sleep $sleeptime
            }
            else {
                throw
            }
        }
    }
}

Export-ModuleMember -Function Use-ExponentialBackoff