Node.js

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. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This is the JavaScript we'll run:

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

    var sbScript = new chilkat.StringBuilder();
    sbScript.Append("console.log('Starting infinite loop...'); while(true) {};");

    var js = new 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;

    var result = new chilkat.JsonObject();
    result.EmitCompact = false;

    //  Run the script..
    success = js.Eval(sbScript,result);
    if (success == false) {
        //  Examine the result for an exception.
        console.log(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.
        console.log(js.LastErrorText);
        return;
    }

    //  We should never get here..
    console.log("Succeeded.");
    console.log(result.Emit());

}

chilkatExample();