Lua 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. Lua

local chilkat = require("chilkat")

-- This is the JavaScript we'll run:

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

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

local 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.timeout_seconds = 2

local result = chilkat.JsonObject.new()
result.emit_compact = false

-- Run the script..
local success = js:eval(sbScript, result)
if not success then
    -- Examine the result for an exception.
    print(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.
    print(js.last_error_text)
    return
end

-- We should never get here..
print("Succeeded.")
print(result:emit())

JavaScript

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