AzureAssess

0.1.24

Invoke-RetryCommand.ps1

                                <#

.SYNOPSIS

    Executes a command and retries it a maximum of time with a exponential delay

    Default is to retry 3 times with a delay of 100ms

.EXAMPLE

    PS C:\ Invoke-RetryCommand -ScriptBlock { Write-Output test } -Retries 3 -Delay 100

#>

function Invoke-RetryCommand {

    [CmdletBinding()]

    Param (

        [Parameter(Position=0, Mandatory=$true)]

        [scriptblock]$ScriptBlock,

        [Parameter(Position=1, Mandatory=$false)]

        [int]$Retries = 3,

        [Parameter(Position=2, Mandatory=$false)]

        [int]$Delay = 100

    )

    Begin {

        $cnt = 0

    }

    Process {

        do {

            $cnt++

            try {

                $res = $ScriptBlock.Invoke()

                return $res

            }

            catch {

                Write-Error $_.Exception.InnerException.Message -ErrorAction Continue

                Start-Sleep -Milliseconds ($Delay * [Math]::Pow(2, $cnt - 1))

            }

        } while ($cnt -le $Retries)

        throw 'Execution failed.'

    }

}

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