BrunoBonacci

// this is the base directory where all user will be segregated (like: "chroot")
BASE_DIR = new File(System.properties.baseDir ?: "/tmp").canonicalPath;

// This map maintains the session state for every connection.
// for this telnet server the state will be limited to the current directory
_connections = [:];

// Connection id counter
_cids = 0;

BrunoBonacci

// general configuration
settings = [port: 1234];

// Vert.x server and event-bus
def server = vertx.createNetServer()
def bus = vertx.eventBus

// Connection handler. Here requests are captured, parsed, and executed.
server.connectHandler { sock ->
    // upon a new connection, assigning a new connection id (cid)

BrunoBonacci

// Regular expression to verify/extract pathnames from commands
PATH_ELEM = "[A-Za-z0-9.-]+"
PATH = "(/?$PATH_ELEM(/$PATH_ELEM)*/?|/)"

// Commands handler
bus.registerHandler("commands") {
    msg ->
    def cmd = msg.body.command
    switch (cmd) {
        case ~$/cd( $PATH)?/$:

BrunoBonacci

////////////////////////////////////////////////////////////////////////// cd
def cd(def path, String cid) {
    path = path == "" ? null : path
    def newPath = virtual2real(path, cid);

    if (!newPath.exists() || !newPath.isDirectory())
        return [status: "ERROR", message: "### ERROR: $path: no such directory!".toString()]

    // changing directory
    _connections[cid].curDir = new File(newPath.canonicalPath);

BrunoBonacci

# this is the replica set name
# every node will need to have the same name
replSet = setname

# this is the authetication encryption key
# this will be required to be same on every node
keyFile = /etc/mongodb.key

# This is the operational log size
# here we assume ~24GB for example

BrunoBonacci

# generate the key and make it readable only by mongo server
sudo openssl rand -base64 753 > /etc/mongodb.key
sudo chown mongod:mongod /etc/mongodb.key
sudo chmod 0600 /etc/mongodb.key

BrunoBonacci

cd /var/lib/mongo/local

# as root user
for i in {0..11} 
do
echo "Initializing new-local.$i"
dd if=/dev/zero of=new-local.$i bs=2146435072 count=1
chown mongod:mongod new-local.$i 
chmod 0600 new-local.$i
done

BrunoBonacci

# stopping the server
sudo /etc/init.d/mongod stop

# now replace local.n files
cd /var/lib/mongo/local
sudo rm -fr local.*
sudo rename 's/new-local/local/g' new-local.*

# restarting the server
sudo /etc/init.d/mongod start

BrunoBonacci

/*
 * this benchmark compares the speed of
 * the reminder operator vs the bitwise
 * equivalent.
 */
public class ReminderBenchmark  {

  final static long d = 8;
  final static long mask = d-1;
  final static long REPEAT = 1_000_000L;

BrunoBonacci

(defn crypto-square [s]
  (->> (re-seq #"\w+" s)
       (map clojure.string/lower-case)
       (apply str)
       (#(let [size (int (Math/ceil (Math/sqrt (count %))))]
           (partition size size (repeat " ") %)))
       (apply map vector)
       (map (partial apply str)) 
       (clojure.string/join "\n")))