def initialize_cpu_sensor(state, cpuname, sensor_manager)
{
  state[cpuname] = 0.0;
  state[cpuname + ".user"] = 0.0;
  state[cpuname + ".nice"] = 0.0;
  state[cpuname + ".system"] = 0.0;
  state[cpuname + ".idle"] = 0.0;
  state[cpuname + ".iowait"] = 0.0;
  state[cpuname + ".irq"] = 0.0;
  state[cpuname + ".softirq"] = 0.0;
}

def update_cpu_state(state, statfile, cpuname)
{
  var regex = cpuname + "\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)";
  var strs = regex_search(statfile, regex);

  var user = to_double(strs[1]);
  var nice = to_double(strs[2]);
  var system = to_double(strs[3]);
  var idle = to_double(strs[4]);
  var iowait = to_double(strs[5]);
  var irq = to_double(strs[6]);
  var softirq = to_double(strs[7]);

  var userd = user - state[cpuname + ".user"];
  var niced = nice - state[cpuname + ".nice"];
  var systemd = system - state[cpuname + ".system"];
  var idled = idle - state[cpuname + ".idle"];
  var iowaitd = iowait - state[cpuname + ".iowait"];
  var irqd = irq - state[cpuname + ".irq"];
  var softirqd = softirq - state[cpuname + ".softirq"];

  var totalticks = userd + niced + systemd + idled + iowaitd + irqd + softirqd;

  state[cpuname] = (totalticks - idled) / totalticks

  state[cpuname + ".user"] = user;
  state[cpuname + ".nice"] = nice;
  state[cpuname + ".system"] = system;
  state[cpuname + ".idle"] = idle;
  state[cpuname + ".iowait"] = iowait;
  state[cpuname + ".irq"] = irq;
  state[cpuname + ".softirq"] = softirq;
}                                                                     

# annotation
def update_state(state)
{
  var file = load_text_file("/proc/stat");

  update_cpu_state(state, file, "cpu");
  update_cpu_state(state, file, "cpu0");
  update_cpu_state(state, file, "cpu1");
}

//dump_system()

var global_state = Map()

initialize_cpu_sensor(global_state, "cpu", sensor_manager);
initialize_cpu_sensor(global_state, "cpu0", sensor_manager);
initialize_cpu_sensor(global_state, "cpu1", sensor_manager);

sensor_manager.add_sensor("cpu", 500, global_state, fun(state) { update_state(state); state["cpu"]; } )
sensor_manager.add_sensor("cpu0", 500, global_state, fun(state) { state["cpu0"]; } )
sensor_manager.add_sensor("cpu1", 500, global_state, fun(state) { state["cpu1"]; } )