!752

static class Event {
  long startTime, duration;
  S question, answer;
  S botID;
}

static PersistentLog<Event> data;

p {
  data = new PersistentLog("data.log");
}

synchronized answer {
  if "avg processing time" {
    if (empty(data)) ret "No data yet";
    long avg = round(getAverage(data, "duration"));
    ret avg + " ms per question (" + l(data) + " requests counted)";
  }
  
  if (match("clear avg processing time", s) && getUserName() != null) {
    data.clear();
    ret "OK, log cleared.";
  }
}

static synchronized S answerPriv(S s) {
  new Matches m;
  if (match("log timing *", s, m)) {
    new Event e;
    copyFields(safeUnstructure(m.unq(0)), e);
    
    // mandatory fields
    assertTrue(e.startTime != 0);
    assertTrue(e.duration >= 0);
    assertTrue(!empty(e.question));
    
    data.add(e);
    ret "OK, logged as item " + l(data);
  }
  ret null;
}