331 lines
10 KiB
PowerShell
331 lines
10 KiB
PowerShell
param(
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[Parameter(Mandatory = $true)]
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[string]$WorkerName,
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[Parameter(Mandatory = $true)]
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[string]$WorkerType,
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[string]$PayloadBase64,
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[string]$PayloadBase64Path,
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[string]$DataRoot = (Join-Path ([Environment]::GetFolderPath('LocalApplicationData')) 'UnifiedWorkers'),
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[int]$MaxRestarts = 5,
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[int]$RestartDelaySeconds = 10
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)
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$ErrorActionPreference = 'Stop'
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[System.Management.Automation.Runspaces.Runspace]::DefaultRunspace = $Host.Runspace
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# region Path setup
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$workerRoot = Join-Path -Path $DataRoot -ChildPath $WorkerType
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$instanceRoot = Join-Path -Path $workerRoot -ChildPath $WorkerName
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New-Item -ItemType Directory -Path $instanceRoot -Force | Out-Null
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$logsRoot = Join-Path -Path $instanceRoot -ChildPath 'logs'
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$stateRoot = Join-Path -Path $instanceRoot -ChildPath 'state'
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New-Item -ItemType Directory -Path $logsRoot -Force | Out-Null
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New-Item -ItemType Directory -Path $stateRoot -Force | Out-Null
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$logPath = Join-Path -Path $logsRoot -ChildPath 'worker.log'
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$metaPath = Join-Path -Path $stateRoot -ChildPath 'worker-info.json'
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$commandPath = Join-Path -Path $stateRoot -ChildPath 'commands.txt'
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$payloadPath = Join-Path -Path $stateRoot -ChildPath "payload.ps1"
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# endregion
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# region Logging
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$logStream = [System.IO.FileStream]::new(
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$logPath,
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[System.IO.FileMode]::Append,
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[System.IO.FileAccess]::Write,
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[System.IO.FileShare]::ReadWrite
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)
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$logWriter = [System.IO.StreamWriter]::new($logStream, [System.Text.Encoding]::UTF8)
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$logWriter.AutoFlush = $true
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# Create C# event handler class that doesn't require PowerShell runspace
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if (-not ("UnifiedWorkers.ProcessLogHandler" -as [type])) {
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$csharpCode = @'
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using System;
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using System.Diagnostics;
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using System.IO;
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namespace UnifiedWorkers
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{
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public sealed class ProcessLogHandler
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{
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private readonly TextWriter _writer;
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private readonly string _prefix;
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private readonly object _lock = new object();
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public ProcessLogHandler(TextWriter writer, string prefix)
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{
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_writer = writer ?? throw new ArgumentNullException("writer");
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_prefix = prefix ?? throw new ArgumentNullException("prefix");
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}
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public void OnDataReceived(object sender, DataReceivedEventArgs e)
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{
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if (e == null || string.IsNullOrEmpty(e.Data))
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{
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return;
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}
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lock (_lock)
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{
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try
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{
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var timestamp = DateTime.UtcNow.ToString("u");
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_writer.WriteLine(string.Format("[{0} {1}] {2}", _prefix, timestamp, e.Data));
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_writer.Flush();
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}
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catch
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{
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// Ignore write errors to prevent cascading failures
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}
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}
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}
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}
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}
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'@
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Add-Type -TypeDefinition $csharpCode -ErrorAction Stop
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}
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function Write-LogLine {
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param(
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[string]$Prefix,
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[string]$Message
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)
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if (-not $logWriter) { return }
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$timestamp = (Get-Date).ToString('u')
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$logWriter.WriteLine("[$Prefix $timestamp] $Message")
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}
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function Write-ControllerLog {
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param([string]$Message)
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Write-LogLine -Prefix 'CTRL' -Message $Message
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}
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function Write-FatalLog {
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param([string]$Message)
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try {
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Write-ControllerLog $Message
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}
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catch {
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$timestamp = (Get-Date).ToString('u')
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$fallback = "[CTRL $timestamp] $Message"
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try {
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[System.IO.File]::AppendAllText($logPath, $fallback + [Environment]::NewLine, [System.Text.Encoding]::UTF8)
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}
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catch {
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# last resort: write to host
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Write-Error $fallback
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}
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}
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}
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# endregion
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# region Helpers
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function Resolve-PayloadBase64 {
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if ($PayloadBase64) {
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return $PayloadBase64.Trim()
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}
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if ($PayloadBase64Path) {
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if (-not (Test-Path $PayloadBase64Path)) {
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throw "Payload file '$PayloadBase64Path' not found."
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}
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$content = Get-Content -Path $PayloadBase64Path -Raw
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if ([string]::IsNullOrWhiteSpace($content)) {
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throw "Payload file '$PayloadBase64Path' is empty."
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}
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return $content.Trim()
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}
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throw "No payload data provided to controller."
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}
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function Write-Metadata {
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param(
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[string]$Status,
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[nullable[int]]$WorkerPid = $null,
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[nullable[int]]$ControllerPid = $PID,
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[int]$Restarts = 0,
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[nullable[int]]$LastExitCode = $null
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)
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$payload = [pscustomobject]@{
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WorkerName = $WorkerName
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WorkerType = $WorkerType
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Status = $Status
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ControllerPid = $ControllerPid
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WorkerPid = $WorkerPid
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Restarts = $Restarts
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LastExitCode = $LastExitCode
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LogPath = $logPath
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CommandPath = $commandPath
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PayloadPath = $payloadPath
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UpdatedAtUtc = (Get-Date).ToUniversalTime()
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}
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$payload | ConvertTo-Json -Depth 5 | Set-Content -Path $metaPath -Encoding UTF8
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}
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function Get-PendingCommands {
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if (-not (Test-Path $commandPath)) {
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return @()
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}
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try {
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$lines = Get-Content -Path $commandPath -ErrorAction Stop
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Remove-Item -Path $commandPath -Force -ErrorAction SilentlyContinue
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return $lines | Where-Object { -not [string]::IsNullOrWhiteSpace($_) }
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}
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catch {
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return @()
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}
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}
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# endregion
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try {
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# record initial state before launching worker
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Write-Metadata -Status 'initializing' -WorkerPid $null -ControllerPid $PID -Restarts 0
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$resolvedPayloadBase64 = Resolve-PayloadBase64
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$PayloadBase64 = $resolvedPayloadBase64
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try {
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# Write payload script to disk
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# The payload is base64-encoded UTF-16 (Unicode), so decode it properly
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Write-ControllerLog "Decoding payload base64 (length: $($resolvedPayloadBase64.Length))"
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$payloadBytes = [Convert]::FromBase64String($resolvedPayloadBase64)
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Write-ControllerLog "Decoded payload to $($payloadBytes.Length) bytes"
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# Convert UTF-16 bytes back to string, then write as UTF-8 (PowerShell's preferred encoding)
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$payloadText = [Text.Encoding]::Unicode.GetString($payloadBytes)
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[IO.File]::WriteAllText($payloadPath, $payloadText, [Text.Encoding]::UTF8)
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Write-ControllerLog "Payload written to $payloadPath ($($payloadText.Length) characters)"
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}
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catch {
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Write-FatalLog "Unable to write payload: $($_.Exception.Message)"
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if ($_.Exception.InnerException) {
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Write-FatalLog "Inner exception: $($_.Exception.InnerException.Message)"
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}
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throw
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}
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$restartCount = 0
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$controllerPid = $PID
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while ($restartCount -le $MaxRestarts) {
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try {
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# Initialize worker process
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$psi = [System.Diagnostics.ProcessStartInfo]::new()
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$pwsh = Get-Command pwsh -ErrorAction SilentlyContinue
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if ($pwsh) {
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$psi.FileName = $pwsh.Source
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}
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else {
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$psi.FileName = (Get-Command powershell -ErrorAction Stop).Source
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}
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$psi.Arguments = "-NoLogo -NoProfile -ExecutionPolicy Bypass -File `"$payloadPath`""
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$psi.UseShellExecute = $false
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$psi.RedirectStandardInput = $true
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$psi.RedirectStandardOutput = $true
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$psi.RedirectStandardError = $true
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$psi.CreateNoWindow = $true
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$workerProcess = New-Object System.Diagnostics.Process
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$workerProcess.StartInfo = $psi
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if (-not $workerProcess.Start()) {
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throw "Failed to start worker process."
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}
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Write-ControllerLog "Worker process started with PID $($workerProcess.Id)"
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Write-Metadata -Status 'running' -WorkerPid $workerProcess.Id -ControllerPid $controllerPid -Restarts $restartCount
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$stdoutHandler = [UnifiedWorkers.ProcessLogHandler]::new($logWriter, 'OUT')
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$stderrHandler = [UnifiedWorkers.ProcessLogHandler]::new($logWriter, 'ERR')
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$outputHandler = [System.Diagnostics.DataReceivedEventHandler]$stdoutHandler.OnDataReceived
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$errorHandler = [System.Diagnostics.DataReceivedEventHandler]$stderrHandler.OnDataReceived
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$workerProcess.add_OutputDataReceived($outputHandler)
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$workerProcess.add_ErrorDataReceived($errorHandler)
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$workerProcess.BeginOutputReadLine()
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$workerProcess.BeginErrorReadLine()
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while (-not $workerProcess.HasExited) {
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$commands = Get-PendingCommands
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foreach ($command in $commands) {
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$trimmed = $command.Trim()
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if (-not $trimmed) { continue }
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Write-ControllerLog "Received command '$trimmed'"
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try {
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$workerProcess.StandardInput.WriteLine($trimmed)
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$workerProcess.StandardInput.Flush()
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}
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catch {
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Write-ControllerLog "Failed to forward command '$trimmed': $($_.Exception.Message)"
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}
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if ($trimmed -ieq 'quit') {
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Write-ControllerLog "Quit command issued. Waiting for worker to exit."
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}
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}
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Start-Sleep -Milliseconds 500
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}
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$exitCode = $workerProcess.ExitCode
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Write-ControllerLog "Worker exited with code $exitCode"
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Write-Metadata -Status 'stopped' -WorkerPid $null -ControllerPid $controllerPid -Restarts $restartCount -LastExitCode $exitCode
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if ($exitCode -eq 0) {
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break
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}
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}
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catch {
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Write-ControllerLog "Controller error: $($_.Exception.Message)"
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}
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$restartCount++
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if ($restartCount -gt $MaxRestarts) {
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Write-ControllerLog "Maximum restart attempts reached. Controller stopping."
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break
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}
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Write-ControllerLog "Restarting worker in $RestartDelaySeconds seconds (attempt $restartCount of $MaxRestarts)."
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Start-Sleep -Seconds $RestartDelaySeconds
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}
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Write-Metadata -Status 'inactive' -WorkerPid $null -ControllerPid $controllerPid -Restarts $restartCount
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Write-ControllerLog "Controller exiting."
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}
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catch {
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Write-FatalLog "Fatal controller error: $($_.Exception.Message)"
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if ($_.ScriptStackTrace) {
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Write-FatalLog "Stack: $($_.ScriptStackTrace)"
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}
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throw
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}
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finally {
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if ($logWriter) {
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$logWriter.Dispose()
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}
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if ($logStream) {
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$logStream.Dispose()
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}
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}
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