scope simpleSpamClientDetect2.

static int #interval = 60000;
static double #perSecondThreshold = 2.0; // per IP + URI
static int #spamMax;
static Set<S> #whiteList = syncSet(myIPs());
static Lock #myLock = lock();

// ip + uri -> time, count
static Map<PairS, Pair<Long, Int>> #ipsAndUris = synchroMap();

// returns pair(count, bad)
static Pair<Int, Bool> simpleSpamClientDetect2(S clientIP, S uri) {
  lock myLock;
  // TODO: clean up map sometimes
  Pair<S> pair = pair(clientIP, uri);
  Pair<Long, Int> value = ipsAndUris.get(pair);
  if (value == null || now() > value.a+interval)
    ipsAndUris.put(pair, value = pair(now(), 1));
  else
    value.b++;
  spamMax = iround(perSecondThreshold*interval/1000);
  ret pair(value.b, !contains(whiteList, clientIP) && value.b >= spamMax);
}

// returns new count
static int #markNoSpam(S clientIP, S uri) {
  lock myLock;
  PairS pair = pair(clientIP, uri);
  Pair<Long, Int> value = ipsAndUris.get(pair);
  if (value != null && value.b > 0) ret --value.b;
  ret -1;
}

end scope

Began life as a copy of #1014077