fix: mailbox rules orchestrator cant start multiple times if the user refreshes before its done anymore

Author: kris6673

Modules/CIPPCore/Public/Entrypoints/HTTP Functions/Email-Exchange/Administration/Invoke-ListMailboxRules.ps1

@@ -22,13 +22,24 @@ Function Invoke-ListMailboxRules {
         $Table.Filter = "Tenant eq '$TenantFilter'"
     }
     $Rows = Get-CIPPAzDataTableEntity @Table | Where-Object -Property Timestamp -GT (Get-Date).AddHours(-1)
+    $PartitionKey = 'MailboxRules'
+    $QueueReference = '{0}-{1}' -f $TenantFilter, $PartitionKey
+    $RunningQueue = Invoke-ListCippQueue | Where-Object { $_.Reference -eq $QueueReference -and $_.Status -notmatch 'Completed' -and $_.Status -notmatch 'Failed' }
 
     $Metadata = @{}
-    if (!$Rows -or ($TenantFilter -eq 'AllTenants' -and ($Rows | Measure-Object).Count -eq 1)) {
+    # If a queue is running, we will not start a new one
+    if ($RunningQueue) {
         $Metadata = [PSCustomObject]@{
-            QueueMessage = 'Loading data. Please check back in 1 minute'
+            QueueMessage = "Still loading data for $TenantFilter. Please check back in a few more minutes"
+        }
+        [PSCustomObject]@{
+            Waiting = $true
+        }
+    } elseif ((!$Rows -and !$RunningQueue) -or ($TenantFilter -eq 'AllTenants' -and ($Rows | Measure-Object).Count -eq 1)) {
+        # If no rows are found and no queue is running, we will start a new one
+        $Metadata = [PSCustomObject]@{
+            QueueMessage = "Loading data for $TenantFilter. Please check back in 1 minute"
         }
-        $GraphRequest = @()
 
         if ($TenantFilter -eq 'AllTenants') {
             $Tenants = Get-Tenants -IncludeErrors | Select-Object defaultDomainName
@@ -37,7 +48,7 @@ Function Invoke-ListMailboxRules {
             $Tenants = @(@{ defaultDomainName = $TenantFilter })
             $Type = $TenantFilter
         }
-        $Queue = New-CippQueueEntry -Name "Mailbox Rules ($Type)" -TotalTasks ($Tenants | Measure-Object).Count
+        $Queue = New-CippQueueEntry -Name "Mailbox Rules ($Type)" -Reference $QueueReference -TotalTasks ($Tenants | Measure-Object).Count
         $Batch = $Tenants | Select-Object defaultDomainName, @{Name = 'FunctionName'; Expression = { 'ListMailboxRulesQueue' } }, @{Name = 'QueueName'; Expression = { $_.defaultDomainName } }, @{Name = 'QueueId'; Expression = { $Queue.RowKey } }
         if (($Batch | Measure-Object).Count -gt 0) {
             $InputObject = [PSCustomObject]@{
@@ -53,6 +64,7 @@ Function Invoke-ListMailboxRules {
     } else {
         if ($TenantFilter -ne 'AllTenants') {
             $Rows = $Rows | Where-Object -Property Tenant -EQ $TenantFilter
+            $Rows = $Rows
         }
         $GraphRequest = $Rows | ForEach-Object {
             $NewObj = $_.Rules | ConvertFrom-Json -ErrorAction SilentlyContinue
@@ -61,6 +73,8 @@ Function Invoke-ListMailboxRules {
         }
     }
 
+    # If no results are found, we will return an empty message to prevent null reference errors in the frontend
+    $GraphRequest = $GraphRequest ?? @()
     $Body = @{
         Results  = @($GraphRequest)
         Metadata = $Metadata