Go

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. Go

    success := false

    // This is the JavaScript we'll run:

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

    sbScript := chilkat.NewStringBuilder()
    sbScript.Append("console.log('Starting infinite loop...'); while(true) {};")

    js := chilkat.NewJs()

    // 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.SetTimeoutSeconds(2)

    result := chilkat.NewJsonObject()
    result.SetEmitCompact(false)

    // Run the script..
    success = js.Eval(sbScript,result)
    if success == false {
        // Examine the result for an exception.
        fmt.Println(*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.
        fmt.Println(js.LastErrorText())
        sbScript.DisposeStringBuilder()
        js.DisposeJs()
        result.DisposeJsonObject()
        return
    }

    // We should never get here..
    fmt.Println("Succeeded.")
    fmt.Println(*result.Emit())

    sbScript.DisposeStringBuilder()
    js.DisposeJs()
    result.DisposeJsonObject()