Nexthink-Nutanix-Connector

0.0.7-beta

Private/NutanixApi.ps1

                                <#

Low-level HTTP/auth/pagination/rate-limiting for Prism Central v4 REST.

Unlike vCenter (PowerCLI/SOAP session), Prism Central v4 is stateless plain REST with

per-request HTTP Basic auth, so there is no Connect/Disconnect session step here -

Get-NutanixApiContext just resolves credentials and builds the base URI + auth header.

Reference: https://developers.nutanix.com/api-reference-v4/ ,

           https://www.nutanix.dev/nutanix-api-user-guide/ (pagination, rate limits)

#>

function Get-NutanixApiContext {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)]

        [NutanixEnvironmentConfiguration]$EnvironmentConfig

    )

    Write-CustomLog -Message "Resolving credentials for Nutanix Prism Central: $($EnvironmentConfig.PrismCentralFQDN)" -Severity 'DEBUG'

    $credential = Get-SecureCredential -Target $EnvironmentConfig.WindowsCredentialEntry

    $username = $credential.UserName

    $password = $credential.GetNetworkCredential().Password

    $basicHeader = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes("${username}:${password}"))

    return [pscustomobject]@{

        BaseUri = "https://$($EnvironmentConfig.PrismCentralFQDN):$($EnvironmentConfig.PrismCentralPort)/api"

        Headers = @{

            'Authorization' = "Basic $basicHeader"

            'Accept'        = 'application/json'

        }

        SkipCertificateCheck = $EnvironmentConfig.SkipCertificateCheck

        RateGate = [System.Threading.SemaphoreSlim]::new(1, 1)

        RequestStarts = [System.Collections.Concurrent.ConcurrentQueue[long]]::new()

    }

}

function Build-NutanixQueryString {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $false)]

        [hashtable]$Query = @{}

    )

    if ($null -eq $Query -or $Query.Count -eq 0) {

        return ''

    }

    $pairs = foreach ($key in $Query.Keys) {

        $value = $Query[$key]

        if ($null -eq $value -or [string]::IsNullOrWhiteSpace([string]$value)) { continue }

        "{0}={1}" -f [Uri]::EscapeDataString($key), [Uri]::EscapeDataString([string]$value)

    }

    if ($pairs.Count -eq 0) { return '' }

    return '?' + ($pairs -join '&')

}

function Wait-NutanixApiRequestSlot {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)]

        [pscustomobject]$Context

    )

    while ($true) {

        [void]$Context.RateGate.Wait()

        $slotAcquired = $false

        $waitMilliseconds = 1

        try {

            $nowMilliseconds = [DateTimeOffset]::UtcNow.ToUnixTimeMilliseconds()

            [long]$oldestStart = 0

            while ($Context.RequestStarts.TryPeek([ref]$oldestStart) -and

                ($nowMilliseconds - $oldestStart) -ge 1000) {

                [long]$discardedStart = 0

                $null = $Context.RequestStarts.TryDequeue([ref]$discardedStart)

            }

            if ($Context.RequestStarts.Count -lt $script:NUTANIX_API_MAX_REQUESTS_PER_SECOND) {

                $Context.RequestStarts.Enqueue($nowMilliseconds)

                $slotAcquired = $true

            }

            elseif ($Context.RequestStarts.TryPeek([ref]$oldestStart)) {

                $waitMilliseconds = [Math]::Max(1, 1000 - ($nowMilliseconds - $oldestStart))

            }

        }

        finally {

            $null = $Context.RateGate.Release()

        }

        if ($slotAcquired) {

            return

        }

        Start-Sleep -Milliseconds $waitMilliseconds

    }

}

function Get-NutanixApiFailureStatusCode {

    param(

        [Parameter(Mandatory = $true)]

        [System.Management.Automation.ErrorRecord]$ErrorRecord

    )

    $response = Get-ExceptionWebResponse -Exception $ErrorRecord.Exception

    if ($null -eq $response -or $null -eq $response.StatusCode) {

        return $null

    }

    return [int]$response.StatusCode.value__

}

function Get-NutanixApiStatusLabel {

    param(

        [Parameter(Mandatory = $false)]

        [AllowNull()]

        [Nullable[int]]$StatusCode

    )

    if ($null -eq $StatusCode) { return 'no response' }

    return [string]$StatusCode

}

function Get-NutanixApiFailureCause {

    # A wrapped request error repeats the URI the caller already logs; report the original error inside it.

    param(

        [Parameter(Mandatory = $true)]

        [System.Management.Automation.ErrorRecord]$ErrorRecord

    )

    if ($null -ne $ErrorRecord.Exception.InnerException) {

        return Get-ExceptionMessageChain -Exception $ErrorRecord.Exception.InnerException

    }

    return $ErrorRecord.Exception.Message

}

function Get-NutanixApiRetryDelay {

    param(

        [Parameter(Mandatory = $true)]

        [int]$Attempt,

        [Parameter(Mandatory = $false)]

        [AllowNull()]

        [Nullable[int]]$StatusCode,

        [Parameter(Mandatory = $true)]

        [System.Management.Automation.ErrorRecord]$ErrorRecord

    )

    $backoffSeconds = [Math]::Min(30, [Math]::Pow(2, $Attempt))

    $response = Get-ExceptionWebResponse -Exception $ErrorRecord.Exception

    if ($StatusCode -ne 429 -or $null -eq $response -or $null -eq $response.Headers) {

        return $backoffSeconds

    }

    $retryAfter = [string]$response.Headers['Retry-After']

    $retryAfterSeconds = 0

    if ([int]::TryParse($retryAfter, [ref]$retryAfterSeconds) -and $retryAfterSeconds -gt 0) {

        return [Math]::Min(60, $retryAfterSeconds)

    }

    return $backoffSeconds

}

function Invoke-NutanixApiRequest {

    <#

    .SYNOPSIS

        GETs a single page from a Prism Central v4 endpoint, with 429 backoff and request pacing.

    #>

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)]

        [pscustomobject]$Context,

        [Parameter(Mandatory = $true)]

        [string]$Path,

        [Parameter(Mandatory = $false)]

        [hashtable]$Query = @{}

    )

    $uri = "$($Context.BaseUri)/$Path" + (Build-NutanixQueryString -Query $Query)

    $attempt = 0

    while ($true) {

        $attempt++

        Wait-NutanixApiRequestSlot -Context $Context

        try {

            $response = Invoke-WebRequestWithLogging -Uri $uri -Method 'GET' -Headers $Context.Headers -UseBasicParsing -SkipCertificateCheck:$Context.SkipCertificateCheck

            return ($response.Content | ConvertFrom-Json)

        }

        catch {

            $statusCode = Get-NutanixApiFailureStatusCode -ErrorRecord $_

            $isTransientFailure = ($null -eq $statusCode -or $statusCode -in @(408, 429, 502, 503, 504))

            if (-not $isTransientFailure -or $attempt -gt $script:NUTANIX_API_MAX_RETRIES) {

                throw "Nutanix API request failed. Uri=$uri Attempt=$attempt HTTP=$(Get-NutanixApiStatusLabel -StatusCode $statusCode) Error=$(Get-NutanixApiFailureCause -ErrorRecord $_)"

            }

            $backoffSeconds = Get-NutanixApiRetryDelay -Attempt $attempt -StatusCode $statusCode -ErrorRecord $_

            Write-CustomLog -Message "Transient Nutanix API failure (HTTP $(Get-NutanixApiStatusLabel -StatusCode $statusCode)). Backing off ${backoffSeconds}s before retry $attempt/$($script:NUTANIX_API_MAX_RETRIES). Uri=$uri" -Severity 'WARNING'

            Start-Sleep -Seconds $backoffSeconds

        }

    }

}

function Get-NutanixPaginatedResults {

    <#

    .SYNOPSIS

        Pages through a Prism Central v4 list endpoint, concatenating '.data' across pages.

    #>

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)]

        [pscustomobject]$Context,

        [Parameter(Mandatory = $true)]

        [string]$Path,

        [Parameter(Mandatory = $false)]

        [hashtable]$ExtraQuery = @{}

    )

    $results = [System.Collections.Generic.List[object]]::new()

    $page = 0

    $limit = $script:NUTANIX_STATS_PAGE_LIMIT

    while ($true) {

        $query = @{} + $ExtraQuery

        $query['$limit'] = $limit

        $query['$page'] = $page

        $response = Invoke-NutanixApiRequest -Context $Context -Path $Path -Query $query

        $pageData = @($response.data)

        foreach ($item in $pageData) {

            $results.Add($item)

        }

        if ($pageData.Count -lt $limit) {

            break

        }

        $page++

    }

    return $results

}

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