PowerShell

Prevent JavaScript Infinite Loops

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Demonstrates how prevent infinite loops or prevent the JavaScript from running for a longer amount of time than allowed. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  This is the JavaScript we'll run:

#  console.log('Starting infinite loop...'); while(true) {};

$sbScript = New-Object Chilkat.StringBuilder
$sbScript.Append("console.log('Starting infinite loop...'); while(true) {};")

$js = New-Object Chilkat.Js

#  Set a limit on the amount of time (in seconds) the script is allowed to run.
#  If the JavaScript takes longer than this amount of time, then Chilkat kills the script without crashing the host program.
#  The default value of TimeoutSeconds is 0, which indicates no limit.
#  For this example, set a limit of 2 seconds.
$js.TimeoutSeconds = 2

$result = New-Object Chilkat.JsonObject
$result.EmitCompact = $false

#  Run the script..
$success = $js.Eval($sbScript,$result)
if ($success -eq $false) {
    #  Examine the result for an exception.
    $($result.Emit())

    #  The result contains this:

    #  	{
    #  	  "exception": {
    #  	    "message": "interrupted - JavaScript exceeded the Chilkat.Js.TimeoutSeconds",
    #  	    "stack": [
    #  	      {
    #  	        "func": "<eval>",
    #  	        "file": "<input>",
    #  	        "line": 1,
    #  	        "col": 8
    #  	      }
    #  	    ]
    #  	  }
    #  	}

    #  Also examine the LastErrorText.
    $($js.LastErrorText)
    exit
}

#  We should never get here..
$("Succeeded.")
$($result.Emit())

JavaScript

console.log('Starting infinite loop...');
while(true) {};