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sclass HTTPSpamBlocker1 {
  Set<S> blockedIPs = expiringSet(10*60.0); // 10 minutes
  
  bool isBadRequest(S uri, S ip) {
    ret pairB(checkRequest(uri, ip));
  }
  
  // pair(count, bad)
  Pair<Int, Bool> checkRequest(S uri, S ip) {
    bool bad = eq(uri, "/simulate-bad-client");
    Pair<Int, Bool> pair = simpleSpamClientDetect2(ip, uri);
    if (pair.b) {
      if (eq(ip, pcall_myFirewallIP()))
        print("Not blocking myself.");
      else {
        print("Blocking IP " + ip);
        blockedIPs.add(ip);
      }
    }
    
    if (blockedIPs.contains(ip)) {
      bad = true;
      print(t3("an HTTP request from a blocked IP", "came in at", dateWithTimeGMT()));
    }
    
    ret pair(pair.a, bad);
  }
}