Private/CacheMethods.ps1

<#
SAMPLE CODE NOTICE
 
THIS SAMPLE CODE IS MADE AVAILABLE AS IS. MICROSOFT MAKES NO WARRANTIES, WHETHER EXPRESS OR IMPLIED,
OF FITNESS FOR A PARTICULAR PURPOSE, OF ACCURACY OR COMPLETENESS OF RESPONSES, OF RESULTS, OR CONDITIONS OF MERCHANTABILITY.
THE ENTIRE RISK OF THE USE OR THE RESULTS FROM THE USE OF THIS SAMPLE CODE REMAINS WITH THE USER.
NO TECHNICAL SUPPORT IS PROVIDED. YOU MAY NOT DISTRIBUTE THIS CODE UNLESS YOU HAVE A LICENSE AGREEMENT WITH MICROSOFT THAT ALLOWS YOU TO DO SO.
#>


$script:CachePath = Join-Path $([Environment]::GetFolderPath('LocalApplicationData')) 'Microsoft.PowerPlatform.EnterprisePolicies\config.json'
$script:CacheData = $null
$script:CurrentCacheVersion = "1.1"

function Get-EmptyCache{
    return [PSCustomObject]@{
        Version = $script:CurrentCacheVersion
        SubscriptionsValidated = @()
        RegionCache = [PSCustomObject]@{}
    }
}

function Update-CacheVersion{
    param(
        [Parameter(Mandatory)]
        [PSCustomObject]$Cache
    )

    while($Cache.Version -ne $script:CurrentCacheVersion){
        switch($Cache.Version){
            "1.0" {
                $Cache | Add-Member -NotePropertyName "RegionCache" -NotePropertyValue ([PSCustomObject]@{})
                $Cache.Version = "1.1"
                Write-Verbose "Upgraded cache from 1.0 to 1.1"
            }
            default {
                Write-Warning "Unknown cache version '$($Cache.Version)'. Resetting to empty cache."
                return Get-EmptyCache
            }
        }
    }

    return $Cache
}

function Initialize-Cache{
    if(-not(Test-Path -Path $script:CachePath)){
        Write-Verbose "Cache file not found. Initializing new cache."
        $script:CacheData = Get-EmptyCache
    }
    else{
        Write-Verbose "Loading cache from $script:CachePath"
        $content = Get-Content -Path $script:CachePath
        if([string]::IsNullOrWhiteSpace($content)){
            Write-Verbose "Cache file is empty. Initializing new cache."
            $script:CacheData = Get-EmptyCache
        }
        else{
            $script:CacheData = $content | ConvertFrom-Json
            $script:CacheData = Update-CacheVersion -Cache $script:CacheData
            foreach($key in $script:CacheData.RegionCache.PSObject.Properties.Name){
                $entry = $script:CacheData.RegionCache.$key
                if($entry.Expiry -is [string]){
                    $entry.Expiry = [DateTime]::Parse($entry.Expiry).ToUniversalTime()
                }
            }
        }
    }
}

function Save-Cache{
    if(-not(Test-Path -Path (Split-Path -Path $script:CachePath))){
        New-Item -ItemType Directory -Path (Split-Path -Path $script:CachePath) -Force | Out-Null
    }
    $script:CacheData | ConvertTo-Json | Out-File -FilePath $script:CachePath -Force
}

function Test-SubscriptionValidated{
    param(
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$SubscriptionId
    )

    return $script:CacheData.SubscriptionsValidated -contains $SubscriptionId
}

function Add-ValidatedSubscriptionToCache{
    param(
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$SubscriptionId
    )

    if(-not($script:CacheData.SubscriptionsValidated -contains $SubscriptionId)){
        $script:CacheData.SubscriptionsValidated += $SubscriptionId
        Save-Cache
    }
}

function Get-EnvironmentRegionFromCache{
    param(
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$EnvironmentId,

        [Parameter(Mandatory)]
        [PPEndpoint]$Endpoint,

        [Parameter(Mandatory=$false)]
        [string]$TenantId
    )

    $cacheKey = "$EnvironmentId|$Endpoint"

    # Check for cached entry
    if($script:CacheData.RegionCache.PSObject.Properties.Name -contains $cacheKey){
        $now = [DateTime]::UtcNow
        $entry = $script:CacheData.RegionCache.$cacheKey
        $expiry = if($entry.Expiry -is [DateTime]){
                $entry.Expiry.ToUniversalTime()
            }
            else{
                $entry.Expiry = $now
            }
        if($expiry -gt $now){
            $remainingMinutes = [math]::Round(($expiry - $now).TotalMinutes, 1)
            Write-Verbose "Region cache hit for $cacheKey. Region: $($entry.Region). Cache valid for $remainingMinutes more minutes."
            return $entry.Region
        }
    }

    # Cache miss or expired - call Get-EnvironmentRegion
    Write-Verbose "Region cache miss for $cacheKey. Calling Get-EnvironmentRegion."
    $params = @{
        EnvironmentId = $EnvironmentId
        Endpoint = $Endpoint
    }
    if(-not([string]::IsNullOrWhiteSpace($TenantId))){
        $params["TenantId"] = $TenantId
    }

    $region = Get-EnvironmentRegion @params
    Write-Verbose "Region resolved for $cacheKey. Region: $region. Caching for 1 hour."

    # Store in cache with 1-hour expiry
    $cacheEntry = [PSCustomObject]@{
        Region = $region
        Expiry = [DateTime]::UtcNow.AddHours(1)
    }
    if($script:CacheData.RegionCache.PSObject.Properties.Name -contains $cacheKey){
        $script:CacheData.RegionCache.$cacheKey = $cacheEntry
    }
    else{
        $script:CacheData.RegionCache | Add-Member -NotePropertyName $cacheKey -NotePropertyValue $cacheEntry
    }

    Save-Cache
    return $region
}

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