zeek/doc/scripting/framework_logging_factorial_02.zeek

module Factor;

export {
    # Append the value LOG to the Log::ID enumerable.
    redef enum Log::ID += { LOG };

    # Define a new type called Factor::Info.
    type Info: record {
        num:           count &log;
        factorial_num: count &log;
        };
    }

function factorial(n: count): count
    {
    if ( n == 0 )
        return 1;
    
    else
        return ( n * factorial(n - 1) );
    }

event zeek_init()
    {
    # Create the logging stream.
    Log::create_stream(LOG, [$columns=Info, $path="factor"]);
    }

event zeek_done()
    {
    local numbers: vector of count = vector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);    
    for ( n in numbers )
        Log::write( Factor::LOG, [$num=numbers[n],
                                  $factorial_num=factorial(numbers[n])]);
    }