public/Invoke-GraphApiRetryRequest.ps1

<#
.SYNOPSIS
  This function invokes a Graph API request with retry logic for rate limiting (HTTP 429 responses).
 
.DESCRIPTION
  The Invoke-GraphApiRetryRequest function sends a request to the Graph API using the provided parameters.
  If the API returns a 429 response (Too Many Requests), the function will wait and retry the request.
  The wait time increases exponentially with each subsequent 429 response (exponential backoff).
 
.PARAMETER method
  Optional. The HTTP method to use for the request. Defaults to 'get'.
 
.PARAMETER uri
  Mandatory. The URI of the Graph API endpoint to which the request will be sent.
 
.PARAMETER body
  Optional. The body of the request, if applicable, if method is get, used as query parameter.
 
.EXAMPLE
  Invoke-GraphApiRetryRequest -uri "/beta/users" -method "get"
#>


function Invoke-GraphApiRetryRequest {
  [CmdletBinding()]
  param (
    [Parameter(ValueFromPipelineByPropertyName)]
    [string]
    $method = 'get',
    [Parameter(Mandatory,
      ValueFromPipelineByPropertyName)]
    [string]
    $uri,
    [Parameter(ValueFromPipelineByPropertyName)]
    [object]
    $body
  )
  Write-Verbose "Invoking Graph API retry request with uri: $uri"
  $sleepDuration = 0
  $retry = $false
  do {
    try {
      $retry = $false
      Invoke-MgGraphRequest -Method $method -Uri $uri -Body $body -ErrorAction Stop
    }
    catch {
      if ($_.Exception.Response.StatusCode.value__ -ne 429) { $retry = $false; throw $_ }
      $sleepDuration = $sleepDuration -eq 0 ? 4 : $sleepDuration * 2
      $retry = $true
      Write-Verbose "API returned 429, retrying in $sleepDuration seconds"
      Start-Sleep -Seconds $sleepDuration
    }
  } until (
    -not $retry
  )
}

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