add: first implementation of login

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/network/ClientService.java

@@ -59,7 +59,28 @@ public class ClientService {
     }
 
     /**
-     * Sends a Request to get all the messages, the other clients sent, and that the client is not currently aware of.
+     * Sends a ping to the server
+     * Returns nothing, the method processMessage() already handles the cases "+OK" or "-ERROR"
+     */
+
+    public void ping() {
+        processMessage("PING");
+    }
+
+    /**
+     * Sends a login request to the server to create a new user on the server
+     * @param username
+     * @return - a new username, if the same username is already used by someone else
+     */
+
+    public String login(String username) {
+        String msg = "LOGIN USERNAME=" + username;
+        return processMessage(msg);
+    }
+
+    /**
+     * Send a Request to get the number of Messages currently in the Queue for the client.
+     * Then proceeds, if needed, to get the messages by sending
      */
 
     public List<Message> getMessages() {
@@ -77,11 +98,26 @@ public class ClientService {
         return messages;
     }
 
-    public String sendMessage(Message message) {
+    /**
+     * Sends a Request to the Server containing all relevant information of the message the client wrote.
+     * @param message
+     * @return
+     */
+
+    public void sendMessage(Message message) {
         String request = "SEND_MESSAGE " + message.toArgsString();
-        return processMessage(request);
+        processMessage(request);
     }
 
+    /**
+     * Sends the Requests to the server and waits for the response
+     * If the response is "+OK" it proceeds normal
+     * If the response "-ERROR" it throws a runtime exception
+     * @param message
+     * @return - The response as a string, if it has to be returned
+     * (+OK will not be returned)
+     */
+
     private String processMessage(String message) {
         AtomicReference<String> response = new AtomicReference<>();
         sendRequest(() -> {
@@ -93,7 +129,7 @@ public class ClientService {
                     System.out.println("Raw message '" + responseLine + "'");
                     if ("+OK".equals(responseLine)) {
                         return;
-                    } else if ("-FAIL".equals(responseLine)) {
+                    } else if (("-ERROR").equals(responseLine)) {
                         throw new RuntimeException(responseLine);
                     }
                     response.set(responseLine);
@@ -105,6 +141,11 @@ public class ClientService {
         return response.get();
     }
 
+    /**
+     *
+     * @param request
+     */
+
     private void sendRequest(Runnable request) {
         Future<?> future = executor.submit(request);
         try {
@@ -116,6 +157,12 @@ public class ClientService {
         }
     }
 
+    /**
+     * Returns a Runtime Exceptions thrown by the sendRequest method
+     * @param e - an Exception
+     * @return - a Runtime Exception
+     */
+
     private static RuntimeException getRuntimeException(Exception e) {
         Throwable reason = e.getCause();
         RuntimeException re;
@@ -127,6 +174,7 @@ public class ClientService {
         re = new RuntimeException(reason);
         return re;
     }
+
     /**
      * Closes the Socket and shuts down the Threadpool associated with that Socket-Connection.
      */
@@ -142,6 +190,12 @@ public class ClientService {
 
     }
 
+    /**
+     * Method to write with the tcp transport to the server
+     * @param s - Message to be sent
+     * @throws IOException
+     */
+
     private void writeToTransport(String s) throws IOException {
         int id = this.idGenerator.incrementAndGet();
         this.clienttcptransport.write(new RawPacket(id, s));

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/network/sendRequest.java

@@ -1,47 +0,0 @@
-package ch.unibas.dmi.dbis.cs108.casono.client.network;
-
-import java.io.BufferedReader;
-import java.util.concurrent.Callable;
-
-import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
-
-import java.util.ArrayList;
-
-import java.io.*;
-
-public class sendRequest implements Runnable {
-
-    final private String request;
-    final private BufferedReader input;
-    final private BufferedWriter output;
-
-    public sendRequest(String request, BufferedReader input, BufferedWriter output) {
-        this.request = request;
-        this.input = input;
-        this.output = output;
-    }
-
-    @Override
-    public void run() {
-        try {
-            output.write(request + "\r\n");
-            output.flush();
-            //System.out.println("Writing following request: " + request);
-        } catch (Exception e) {
-            System.out.println(e);
-        }
-
-        try {
-            while (true) {
-                String line;
-                line = input.readLine();
-                if (line.toLowerCase().startsWith("+ok")) {
-                    break;
-                }
-                ClientService.response.add(line);
-            }
-        } catch (Exception e) {
-            System.out.println(e);
-        }
-    }
-}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/handlers/ChatHandler.java

@@ -9,6 +9,11 @@ import java.util.ArrayDeque;
 public class ChatHandler {
     private final EventBus eventBus;
     private final ArrayDeque<Message> receivedMessages = new ArrayDeque<>();
+
+    /**
+     * Creates a ChatHandler for a Session
+     * @param eventBus
+     */
     public ChatHandler(EventBus eventBus) {
         eventBus.subscribe(ChatMessageEvent.class, (event) -> {
             processMessageEvent(event.getMessage());
@@ -16,18 +21,34 @@ public class ChatHandler {
         this.eventBus = eventBus;
     }
 
+    /**
+     * Sends the Chat Message that the server received to the queue
+     * @param message
+     */
+
     private synchronized void processMessageEvent(Message message) {
-        // TODO: filter
+        // TODO: filter for Messages that were sent by the Client
         this.receivedMessages.offer(message);
     }
 
+
+    /**
+     * Returns the current size of the queue (Used for Command GET_MESSAGE_COUNT)
+     */
     public synchronized int getMessageCount() {
         return this.receivedMessages.size();
     }
+
+    /**
+     * Takes the next message out of the queue, to be sent to the Client
+     */
     public synchronized Message getNextMessage() {
         return this.receivedMessages.poll();
     }
 
+    /**
+     * Message is converted into a String and sent to the Client
+     */
     public void sendMessage(String messageString) {
         Message msg = Message.toMessage(messageString);
         this.eventBus.publish(new ChatMessageEvent(msg));

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/handlers/UserHandler.java

@@ -0,0 +1,57 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.handlers;
+
+import jdk.jshell.spi.ExecutionControl;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class UserHandler {
+
+    private final List<String> usernames;
+
+    public UserHandler() {
+        this.usernames = new ArrayList<String>();
+    }
+
+    public Boolean checkUsername(String username) {
+        for (int i = 0; i < this.usernames.size(); i++) {
+            if (this.usernames.get(i).equals(username)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public Pattern usrRex = Pattern.compile("USERNAME=(?<user>\\w+)");
+
+    public String addUsername(String username) {
+        Matcher matcher = usrRex.matcher(username);
+        if (! matcher.find()) {
+            throw new RuntimeException("Cannot parse " +  username);
+        }
+        String usr = matcher.group("user");
+        if (!this.checkUsername(usr)) {
+            this.usernames.add(usr);
+        } else {
+            this.usernames.add(getAltUsername(usr));
+        }
+        return String.format("USERNAME=%s", usr);
+    }
+
+    public void removeUsername(String username) {
+        this.usernames.remove(username);
+    }
+
+    public String getAltUsername(String username) {
+        int count = 0;
+        while (true) {
+            username = String.format("%s%d", username, ++count);
+            if (this.checkUsername(username)) {
+                return username;
+            }
+        }
+    }
+
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/sessions/Session.java

@@ -5,6 +5,7 @@ import java.io.IOException;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import ch.unibas.dmi.dbis.cs108.casono.server.network.handlers.ChatHandler;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.handlers.UserHandler;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.transport.RawPacket;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -18,6 +19,7 @@ import ch.unibas.dmi.dbis.cs108.casono.server.network.transport.TransportLayer;
  */
 public class Session implements Runnable {
     private final ChatHandler chatHandler;
+    private final UserHandler userHandler;
     private SessionId id;
     private Thread thread;
     private TransportLayer transport;
@@ -44,6 +46,7 @@ public class Session implements Runnable {
         this.logger.info("Created new session");
         this.idGenerator = new AtomicInteger();
         this.chatHandler = new ChatHandler(eventBus);
+        this.userHandler = new UserHandler();
     }
 
     /**
@@ -97,7 +100,7 @@ public class Session implements Runnable {
                     case "GET_NEXT_MESSAGE":
                          if (chatHandler.getMessageCount() == 0) {
                              logger.warn("FAIL No more messages!");
-                             writeToTransport("-FAIL");
+                             writeToTransport("-ERROR");
                          } else {
                              String msgString = chatHandler.getNextMessage().toArgsString();
                              logger.debug("Session "+id.value()+" Write next message "+msgString);
@@ -105,9 +108,19 @@ public class Session implements Runnable {
                              writeToTransport("+OK");
                          }
                          break;
+                    case "LOGIN":
+                        String usr = userHandler.addUsername(commandAndArgs[1]);
+                        writeToTransport(usr);
+                        writeToTransport("+OK");
+
+                    case "LOGOUT":
+                        userHandler.removeUsername(commandAndArgs[1]);
+                        writeToTransport("+OK");
+                    case "PING":
+                        
                     default:
                         this.logger.warn("Unknown command: " + commandWord);
-                        writeToTransport("-FAIL");
+                        writeToTransport("-ERROR");
                 }
             } catch (EOFException e) {
                 logger.info("Client disconnected");

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/network/ClientServiceTest.java

@@ -33,15 +33,20 @@ public class ClientServiceTest {
     @Test
     public void testClientService() throws ExecutionException, InterruptedException {
         ClientService client1 = new ClientService("localhost", 5000);
+        /*
         ClientService client2 = new ClientService("localhost", 5000);
         Thread.sleep(2000);
-        String response = client1.sendMessage(new Message(Message.MessageType.GLOBAL, 0, "Mathis", null, "blahh"));
+        client1.sendMessage(new Message(Message.MessageType.GLOBAL, 0, "Mathis", null, "blahh"));
         Thread.sleep(5000);
         List<Message> received = client2.getMessages();
 
         assertEquals(1, received.size());
         Message s = received.get(0);
         assertEquals(Message.MessageType.GLOBAL, s.getMessageType());
+         */
+
+        String username = client1.login("Mathis");
+        assertEquals("USERNAME=Mathis", username);
     }
 
     @Test