TechToolbox

0.5.16

Private/AI/Invoke-LocalLLM.ps1

                                function Invoke-LocalLLM {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory)]

        [string]$Prompt,

        [string]$Model = 'qwen2.5-coder:32b',

        # Optional override for streaming

        [switch]$ForceStream,

        # Robustness knobs

        [int]$TimeoutMinutes = 15,

        [int]$RetryCount = 1,

        [int]$RetryDelaySeconds = 2,

        # Prefer returning an object (TechToolbox-friendly)

        [switch]$ThrowOnError

    )

    # -----------------------------

    # STREAMING RULES (deterministic)

    # -----------------------------

    $streamingModels = @(

        'qwen2.5-coder:14b'   # Known stable streaming model

    )

    $Stream =

    if ($ForceStream) { $true }

    elseif ($streamingModels -contains $Model) { $true }

    else { $false }

    # -----------------------------

    # Helpers

    # -----------------------------

    function New-LLMResult {

        param(

            [bool]$Success,

            [string]$Text,

            [string]$Model,

            [bool]$Stream,

            [TimeSpan]$Duration,

            [Nullable[int]]$StatusCode,

            [string]$ReasonPhrase,

            [System.Exception]$Exception,

            [System.Management.Automation.ErrorRecord]$ErrorRecord

        )

        [pscustomobject]@{

            PSTypeName   = 'TechToolbox.LocalLLM.Result'

            Success      = $Success

            Text         = $Text

            Model        = $Model

            Stream       = $Stream

            DurationMs   = [int]$Duration.TotalMilliseconds

            StatusCode   = $StatusCode

            ReasonPhrase = $ReasonPhrase

            Exception    = $Exception

            ErrorRecord  = $ErrorRecord

        }

    }

    function Format-ExceptionChain([Exception]$ex) {

        $parts = New-Object System.Collections.Generic.List[string]

        $i = 0

        while ($ex) {

            $parts.Add(("[$i] {0}: {1}" -f $ex.GetType().FullName, $ex.Message))

            $ex = $ex.InnerException

            $i++

        }

        $parts -join " | "

    }

    function Test-PortSilent {

        param(

            [string]$Host,

            [int]$Port,

            [int]$TimeoutMs = 500

        )

        try {

            $client = New-Object System.Net.Sockets.TcpClient

            $async = $client.BeginConnect($Host, $Port, $null, $null)

            $wait = $async.AsyncWaitHandle.WaitOne($TimeoutMs, $false)

            if (-not $wait) {

                $client.Close()

                return $false

            }

            $client.EndConnect($async)

            $client.Close()

            return $true

        }

        catch {

            return $false

        }

    }

    # -----------------------------

    # Build request bits

    # -----------------------------

    $baseUrl = 'http://localhost:11434/api'

    $requestUri = [Uri]"$baseUrl/generate"

    $body = @{

        model  = $Model

        prompt = $Prompt

        stream = $Stream

    } | ConvertTo-Json -Depth 5

    $handler = $null

    $client = $null

    $response = $null

    $streamObj = $null

    $reader = $null

    $sw = [System.Diagnostics.Stopwatch]::StartNew()

    try {

        Write-Log -Level Warn -Message ("Invoking local LLM at '{0}' with model '{1}' (stream={2})..." -f $requestUri, $Model, $Stream)

        # Optional preflight: fail fast if Ollama isn't listening.

        # (Fast & clean when service is down; doesn't help with GPU driver crash, but avoids confusion.)

        try {

            $isUp = Test-PortSilent -Host 'localhost' -Port 11434

            if (-not $isUp) {

                $msg = "Ollama is not listening on localhost:11434. Start Ollama and try again."

                $err = [System.Management.Automation.ErrorRecord]::new(

                    [System.Exception]::new($msg),

                    'OllamaNotListening',

                    [System.Management.Automation.ErrorCategory]::ConnectionError,

                    $requestUri

                )

                $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                    -StatusCode $null -ReasonPhrase $null -Exception $err.Exception -ErrorRecord $err

                if ($ThrowOnError) { throw $err.Exception }

                return $result

            }

        }

        catch {

            # If preflight itself fails, ignore and proceed to the real call.

        }

        $handler = [System.Net.Http.HttpClientHandler]::new()

        $client = [System.Net.Http.HttpClient]::new($handler)

        $client.Timeout = [TimeSpan]::FromMinutes($TimeoutMinutes)

        $attempt = 0

        $lastException = $null

        while ($attempt -le $RetryCount) {

            $attempt++

            # IMPORTANT: build a fresh request each attempt (don’t reuse HttpRequestMessage/StringContent).

            $request = [System.Net.Http.HttpRequestMessage]::new([System.Net.Http.HttpMethod]::Post, $requestUri)

            $request.Content = [System.Net.Http.StringContent]::new($body, [System.Text.Encoding]::UTF8, 'application/json')

            try {

                if ($Stream) {

                    $response = $client.SendAsync(

                        $request,

                        [System.Net.Http.HttpCompletionOption]::ResponseHeadersRead

                    ).GetAwaiter().GetResult()

                }

                else {

                    $response = $client.SendAsync($request).GetAwaiter().GetResult()

                }

                # request is safe to dispose after send

                $request.Dispose()

                $request = $null

                break

            }

            catch {

                $lastException = $_.Exception

                $msg = "Send attempt $attempt/$($RetryCount+1) failed: $(Format-ExceptionChain $lastException)"

                Write-Log -Level Warn -Message $msg

                if ($request) { $request.Dispose(); $request = $null }

                if ($attempt -le $RetryCount) {

                    Start-Sleep -Seconds $RetryDelaySeconds

                    continue

                }

                # Return structured failure (or throw, if requested)

                $err = [System.Management.Automation.ErrorRecord]::new(

                    $lastException,

                    'LocalLLMSendFailed',

                    [System.Management.Automation.ErrorCategory]::ConnectionError,

                    $requestUri

                )

                $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                    -StatusCode $null -ReasonPhrase $null -Exception $lastException -ErrorRecord $err

                if ($ThrowOnError) { throw $lastException }

                return $result

            }

        }

        # Response sanity

        if ($null -eq $response) {

            $msg = "SendAsync returned null response (unexpected). If your GPU driver reset, Ollama may have crashed mid-request."

            $ex = [System.Exception]::new($msg)

            $err = [System.Management.Automation.ErrorRecord]::new(

                $ex,

                'NullHttpResponse',

                [System.Management.Automation.ErrorCategory]::InvalidResult,

                $requestUri

            )

            $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                -StatusCode $null -ReasonPhrase $null -Exception $ex -ErrorRecord $err

            if ($ThrowOnError) { throw $ex }

            return $result

        }

        # Non-success HTTP -> return error object with body

        if (-not $response.IsSuccessStatusCode) {

            $bodyText = $response.Content.ReadAsStringAsync().GetAwaiter().GetResult()

            $msg = "HTTP $([int]$response.StatusCode) ($($response.ReasonPhrase)): $bodyText"

            $ex = [System.Exception]::new($msg)

            $err = [System.Management.Automation.ErrorRecord]::new(

                $ex,

                'OllamaHttpError',

                [System.Management.Automation.ErrorCategory]::InvalidOperation,

                $requestUri

            )

            $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $ex -ErrorRecord $err

            if ($ThrowOnError) { throw $ex }

            return $result

        }

        # -----------------------------

        # NON-STREAMING

        # -----------------------------

        if (-not $Stream) {

            $json = $response.Content.ReadAsStringAsync().GetAwaiter().GetResult()

            if ([string]::IsNullOrWhiteSpace($json)) {

                $msg = "Local LLM returned an empty response body."

                $ex = [System.Exception]::new($msg)

                $err = [System.Management.Automation.ErrorRecord]::new(

                    $ex,

                    'EmptyBody',

                    [System.Management.Automation.ErrorCategory]::InvalidResult,

                    $requestUri

                )

                $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                    -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $ex -ErrorRecord $err

                if ($ThrowOnError) { throw $ex }

                return $result

            }

            try {

                $obj = $json | ConvertFrom-Json

                $text =

                if ($obj.response) { $obj.response }

                elseif ($obj.message) { $obj.message }

                else { $json }

                Write-Log -Level OK -Message ("Local LLM call completed for model '{0}'." -f $Model)

                return (New-LLMResult -Success:$true -Text $text -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                        -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $null -ErrorRecord $null)

            }

            catch {

                # Return raw JSON if parsing fails, but still count as success

                Write-Log -Level OK -Message ("Local LLM call completed for model '{0}' (unparsed JSON)." -f $Model)

                return (New-LLMResult -Success:$true -Text $json -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                        -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $null -ErrorRecord $null)

            }

        }

        # -----------------------------

        # STREAMING (JSONL)

        # -----------------------------

        $sb = [System.Text.StringBuilder]::new()

        $streamObj = $response.Content.ReadAsStreamAsync().GetAwaiter().GetResult()

        $reader = [System.IO.StreamReader]::new($streamObj)

        while (-not $reader.EndOfStream) {

            $line = $reader.ReadLine()

            if ([string]::IsNullOrWhiteSpace($line)) { continue }

            try {

                $obj = $line | ConvertFrom-Json

            }

            catch {

                Write-Log -Level Warn -Message ("Malformed JSON from LLM stream: {0}" -f $line)

                continue

            }

            if ($obj.error) {

                $ex = [System.Exception]::new("Ollama stream error: $($obj.error)")

                $err = [System.Management.Automation.ErrorRecord]::new(

                    $ex,

                    'OllamaStreamError',

                    [System.Management.Automation.ErrorCategory]::InvalidOperation,

                    $requestUri

                )

                $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                    -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $ex -ErrorRecord $err

                if ($ThrowOnError) { throw $ex }

                return $result

            }

            if ($obj.response) { [void]$sb.Append($obj.response) }

            if ($obj.done -eq $true) { break }

        }

        $text = $sb.ToString()

        if ([string]::IsNullOrWhiteSpace($text)) {

            $msg = "Streaming mode completed but produced no text."

            $ex = [System.Exception]::new($msg)

            $err = [System.Management.Automation.ErrorRecord]::new(

                $ex,

                'EmptyStream',

                [System.Management.Automation.ErrorCategory]::InvalidResult,

                $requestUri

            )

            $result = New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $ex -ErrorRecord $err

            if ($ThrowOnError) { throw $ex }

            return $result

        }

        Write-Log -Level OK -Message ("Local LLM call completed for model '{0}'." -f $Model)

        return (New-LLMResult -Success:$true -Text $text -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                -StatusCode ([int]$response.StatusCode) -ReasonPhrase $response.ReasonPhrase -Exception $null -ErrorRecord $null)

    }

    catch {

        # Last-chance catch: return structured result (unless ThrowOnError)

        $ex = $_.Exception

        Write-Log -Level Error -Message ("Error invoking local LLM: {0}" -f $ex.ToString())

        if ($ThrowOnError) { throw }

        $err = [System.Management.Automation.ErrorRecord]::new(

            $ex,

            'InvokeLocalLLMFailed',

            [System.Management.Automation.ErrorCategory]::NotSpecified,

            $requestUri

        )

        return (New-LLMResult -Success:$false -Text $null -Model $Model -Stream:$Stream -Duration $sw.Elapsed `

                -StatusCode $null -ReasonPhrase $null -Exception $ex -ErrorRecord $err)

    }

    finally {

        $sw.Stop()

        if ($reader) { $reader.Dispose() }

        if ($streamObj) { $streamObj.Dispose() }

        if ($response) { $response.Dispose() }

        if ($client) { $client.Dispose() }

        if ($handler) { $handler.Dispose() }

    }

}

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