Background web worker with colorizing output

background.ps1

param ( 
	$mode = $null,
	$num = 1,
	$url = $null
)

if( $mode -eq $null -or $url -eq $null ) {
	write-host "Syntax: background.ps1 [start|loop] [1-100] [url]"
	exit 1
} 

$name = "BgWeb"

function getonce($url) {
	write-host "Sending request: $url"
	$request = [System.Net.WebRequest]::Create( $url )
	$response = $request.GetResponse()
	$requestStream = $response.GetResponseStream()
	$readStream = new-object System.IO.StreamReader $requestStream
	new-variable db
	while( $db = $readStream.ReadLine() ) {
		if( $db.StartsWith( "DEBUG" ) ) {
			write-host -foregroundcolor darkcyan $db
		} elseif( $db.StartsWith( "WARN" ) ) {
			write-host -foregroundcolor yellow $db
		} elseif( $db.StartsWith( "ERROR" ) ) {
			write-host -foregroundcolor red $db
		} elseif( $db.StartsWith( "INFO" ) ) {
			write-host -foregroundcolor cyan $db
		} else {
			write-host $db 
		}
	}
	write-host "Done.";
	$readStream.Close()
	$response.Close()
}

if( $mode -eq "start" ) {
	Write-Host "Starting $num workerloops..."
	$path =  $MyInvocation.MyCommand.Definition
	$i = 1;
	do {
		Start-process powershell "$path loop 0 $url"
		$i++
	}
	while ($i -le $num)
}
elseif( $mode -eq "loop" ) {
	$rn = New-Object System.Random
	while( 1 ) {
		$d = $rn.next( 500, 4000 );
		write-host "Delaying $d ms..."
		Start-Sleep -m $d
		getonce( $url )
	}
}
else {
	write-host "Unknown mode $mode "
	exit 1
}