Rust Requires Chilkat v11.4.0+

Prevent JavaScript Infinite Loops

See more JavaScript Examples

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

// This is the JavaScript we'll run:

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

let sb_script = chilkat::StringBuilder::new();
let _ = sb_script.append("console.log('Starting infinite loop...'); while(true) {};");

let js = chilkat::Js::new();

// 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.set_timeout_seconds(2);

let result = chilkat::JsonObject::new();
result.set_emit_compact(false);

// Run the script..
if js.eval(&sb_script, &result).is_err() {
    // Examine the result for an exception.
    println!("{}", result.emit().unwrap_or_default());

    // 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.
    println!("{}", js.last_error_text());
    return;
}

// We should never get here..
println!("Succeeded.");
println!("{}", result.emit().unwrap_or_default());

JavaScript

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