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Async Websocket PowerShell client (producer/consumer pattern)
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<# | |
References: | |
- https://docs.microsoft.com/en-us/dotnet/api/system.net.websockets.clientwebsocket?view=netframework-4.5 | |
- https://github.com/poshbotio/PoshBot/blob/master/PoshBot/Implementations/Slack/SlackConnection.ps1 | |
- https://www.leeholmes.com/blog/2018/09/05/producer-consumer-parallelism-in-powershell/ | |
#> | |
$client_id = [System.GUID]::NewGuid() | |
$recv_queue = New-Object 'System.Collections.Concurrent.ConcurrentQueue[String]' | |
$send_queue = New-Object 'System.Collections.Concurrent.ConcurrentQueue[String]' | |
$ws = New-Object Net.WebSockets.ClientWebSocket | |
$cts = New-Object Threading.CancellationTokenSource | |
$ct = New-Object Threading.CancellationToken($false) | |
Write-Output "Connecting..." | |
$connectTask = $ws.ConnectAsync("ws://192.168.1.1:8000/$client_id", $cts.Token) | |
do { Sleep(1) } | |
until ($connectTask.IsCompleted) | |
Write-Output "Connected!" | |
$recv_job = { | |
param($ws, $client_id, $recv_queue) | |
$buffer = [Net.WebSockets.WebSocket]::CreateClientBuffer(1024,1024) | |
$ct = [Threading.CancellationToken]::new($false) | |
$taskResult = $null | |
while ($ws.State -eq [Net.WebSockets.WebSocketState]::Open) { | |
$jsonResult = "" | |
do { | |
$taskResult = $ws.ReceiveAsync($buffer, $ct) | |
while (-not $taskResult.IsCompleted -and $ws.State -eq [Net.WebSockets.WebSocketState]::Open) { | |
[Threading.Thread]::Sleep(10) | |
} | |
$jsonResult += [Text.Encoding]::UTF8.GetString($buffer, 0, $taskResult.Result.Count) | |
} until ( | |
$ws.State -ne [Net.WebSockets.WebSocketState]::Open -or $taskResult.Result.EndOfMessage | |
) | |
if (-not [string]::IsNullOrEmpty($jsonResult)) { | |
#"Received message(s): $jsonResult" | Out-File -FilePath "logs.txt" -Append | |
$recv_queue.Enqueue($jsonResult) | |
} | |
} | |
} | |
$send_job = { | |
param($ws, $client_id, $send_queue) | |
$ct = New-Object Threading.CancellationToken($false) | |
$workitem = $null | |
while ($ws.State -eq [Net.WebSockets.WebSocketState]::Open){ | |
if ($send_queue.TryDequeue([ref] $workitem)) { | |
#"Sending message: $workitem" | Out-File -FilePath "logs.txt" -Append | |
[ArraySegment[byte]]$msg = [Text.Encoding]::UTF8.GetBytes($workitem) | |
$ws.SendAsync( | |
$msg, | |
[System.Net.WebSockets.WebSocketMessageType]::Binary, | |
$true, | |
$ct | |
).GetAwaiter().GetResult() | Out-Null | |
} | |
} | |
} | |
Write-Output "Starting recv runspace" | |
$recv_runspace = [PowerShell]::Create() | |
$recv_runspace.AddScript($recv_job). | |
AddParameter("ws", $ws). | |
AddParameter("client_id", $client_id). | |
AddParameter("recv_queue", $recv_queue).BeginInvoke() | Out-Null | |
Write-Output "Starting send runspace" | |
$send_runspace = [PowerShell]::Create() | |
$send_runspace.AddScript($send_job). | |
AddParameter("ws", $ws). | |
AddParameter("client_id", $client_id). | |
AddParameter("send_queue", $send_queue).BeginInvoke() | Out-Null | |
try { | |
do { | |
$msg = $null | |
while ($recv_queue.TryDequeue([ref] $msg)) { | |
Write-Output "Processed message: $msg" | |
$hash = @{ | |
ClientID = $client_id | |
Payload = "Wat" | |
} | |
$test_payload = New-Object PSObject -Property $hash | |
$json = ConvertTo-Json $test_payload | |
$send_queue.Enqueue($json) | |
} | |
} until ($ws.State -ne [Net.WebSockets.WebSocketState]::Open) | |
} | |
finally { | |
Write-Output "Closing WS connection" | |
$closetask = $ws.CloseAsync( | |
[System.Net.WebSockets.WebSocketCloseStatus]::Empty, | |
"", | |
$ct | |
) | |
do { Sleep(1) } | |
until ($closetask.IsCompleted) | |
$ws.Dispose() | |
Write-Output "Stopping runspaces" | |
$recv_runspace.Stop() | |
$recv_runspace.Dispose() | |
$send_runspace.Stop() | |
$send_runspace.Dispose() | |
} |
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