(chocolateyGH-90) Update Get-ChocoInstalledPackage to Cache to Progra…

…mData

Get-ChocoInstalledPackage must run and parse choco list -lo for every package managed by DSC

This commit ensures a cChoco folder in ProgramData and exports the custom object to Clixml, and will simply read it from file if last write time is less that 60 Seconds ago.

DSCResources/cChocoPackageInstall/cChocoPackageInstall.psm1

@@ -1,4 +1,4 @@
-# Copyright (c) 2017 Chocolatey Software, Inc.
+# Copyright (c) 2017 Chocolatey Software, Inc.
 # Copyright (c) 2013 - 2017 Lawrence Gripper & original authors/contributors from https://github.com/chocolatey/cChoco
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -396,7 +396,32 @@ Function Upgrade-Package {
 }
 
 function Get-ChocoInstalledPackage {
-    Return (choco list -lo -r | ConvertFrom-Csv -Header 'Name', 'Version' -Delimiter "|")
+    $res = $null
+    $dateMinus = (Get-Date).AddSeconds('-60')
+
+    $path = 'C:\ProgramData\cChoco'
+    $childPath = 'ChocoInstalled.xml'
+    $ChocoInstallList = Join-Path -Path $path -ChildPath $childPath
+
+    $lastWriteTime = (Get-Item $ChocoInstallList -ErrorAction SilentlyContinue).LastWriteTime
+
+    if ( $dateMinus -lt $lastWriteTime ) {
+            $res = Import-Clixml $ChocoInstallList
+    }
+    if (-not ( Test-Path $path )){
+        New-Item -Path $path -ItemType Directory |Out-Null
+    }
+    if (-not $res){
+        $res = choco list -lo | ForEach-Object {
+            $Obj = $_ -split '\s'
+            [pscustomobject]@{
+                'Name'    = $Obj[0]
+                'Version' = $Obj[1]     
+            }
+        }
+        Export-Clixml -path $ChocoInstallList -InputObject $res
+    }
+    Return $res
 }
 
 Export-ModuleMember -Function *-TargetResource