From 4a7550e3e9137261c156d3cdedefa64323d2dda3 Mon Sep 17 00:00:00 2001
From: Kim Mundel <kim.mundel@student.reutlingen-university.de>
Date: Fri, 5 May 2023 20:09:59 +0000
Subject: [PATCH] Slight Changes to Protocol
---
src/main/java/slp/SLPProtocol.java | 323 +++++++++++++++++++++--------
1 file changed, 232 insertions(+), 91 deletions(-)
diff --git a/src/main/java/slp/SLPProtocol.java b/src/main/java/slp/SLPProtocol.java
index 2592f2d..dce4565 100644
--- a/src/main/java/slp/SLPProtocol.java
+++ b/src/main/java/slp/SLPProtocol.java
@@ -2,120 +2,261 @@ package slp;
import java.io.IOException;
import java.net.InetAddress;
+import java.net.Socket;
import java.net.SocketTimeoutException;
import java.util.HashMap;
import java.util.Map;
+import java.util.zip.CRC32;
+import java.util.zip.Checksum;
-import core.Configuration;
import core.Msg;
+import core.Configuration;
import core.Protocol;
import phy.PhyConfiguration;
+import phy.PhyMsg;
import phy.PhyProtocol;
import exceptions.*;
+import javax.xml.crypto.Data;
public class SLPProtocol extends Protocol {
- private static final int SLPTIMEOUT = 2000;
- private int myID;
- private final PhyProtocol phy;
- private final boolean isSwitch;
- private boolean isRegistered;
- private boolean useTimeout;
- // Switches map slp id to virtual link
- private Map<Integer, PhyConfiguration> systems;
- PhyConfiguration phyConfig;
-
- // Constructor
- public SLPProtocol(int id, boolean isSwitch, PhyProtocol proto) throws IWProtocolException {
- if(isSwitch == true && id < 5000) {
- systems = new HashMap<>();
- } else {
- if(SLPRegMsg.validateAddress(id) == false )
- throw new IllegalAddrException();
- this.myID = id;
- this.isRegistered = false;
- }
- this.isSwitch = isSwitch;
- this.phy = proto;
- }
-
- /*
- * Enable/disable the use of timeout when reading from socket
- */
- private void enableTimeout() {
- this.useTimeout = true;
- }
- private void disableTimeout() {
- this.useTimeout = false;
- }
+ private static final int SLPTIMEOUT = 2000;
+ private int myID;
+ private final PhyProtocol phy;
+ private final boolean isSwitch;
+ private boolean isRegistered;
+ private boolean useTimeout;
+ // Switches map slp id to virtual link
+ private Map<Integer, PhyConfiguration> systems;
+ PhyConfiguration phyConfig;
+
+
+ // Constructor
+ public SLPProtocol(int id, boolean isSwitch, PhyProtocol proto) throws IWProtocolException {
+ if (isSwitch && id < 5000) {
+ systems = new HashMap<>();
+ } else {
+ if (SLPRegMsg.validateAddress(id) == false)
+ throw new IllegalAddrException();
+ this.myID = id;
+ this.isRegistered = false;
+ }
+ this.isSwitch = isSwitch;
+ this.phy = proto;
+ }
+
+ /*
+ * Enable/disable the use of timeout when reading from socket
+ */
+ public void enableTimeout() {
+ this.useTimeout = true;
+ }
+
+ public void disableTimeout() {
+ this.useTimeout = false;
+ }
- // Register an end systems
- public void register(InetAddress rname, int rp) throws IWProtocolException, IOException {
- // Create registration message object
- SLPRegMsg reg = new SLPRegMsg();
- // Fill registration message fields
- reg.create(Integer.toString(this.myID));
- // Create configuration object
- this.phyConfig = new PhyConfiguration(rname, rp);
-
- /* -- Remove for task 4 -- */
- // Send registration request via phy layer
- phy.send(new String(reg.getDataBytes()), this.phyConfig);
- SLPMsg in = new SLPMsg();
- ;
- Msg inBasic;
- try {
- // Receive response from phy layer - timeout 2s
- inBasic = this.phy.receive(2000);
- // Get data from msg object
- String sentence = inBasic.getData();
- // Parse response
- in = (SLPMsg) in.parse(sentence);
- } catch (SocketTimeoutException e) {
- System.out.println("No response received");
- throw new RegistrationFailedException();
- }catch (IllegalMsgException e) {
- System.out.println("Cannot parse response");
- throw new RegistrationFailedException();
- }
- // If any other message than a registration response message was received or
- // the registration response indicates failure throw exception
- if (!(in instanceof SLPRegResponseMsg) || (((SLPRegResponseMsg)in).getRegResponse() == false)) {
- // A registration non-acknowledgement is signaled by throwing an exception
- throw new RegistrationFailedException();
- }
- /* -- End remove for task 4 -- */
-
- this.isRegistered = true;
+ // Combine setting the Timeouts
+ public void setTimeout(boolean newTimeout){
+ this.useTimeout = newTimeout;
}
+
+ // Register an end systems
+ public void register(InetAddress rname, int rp) throws IWProtocolException, IOException {
+
+ /* ------------ CODE FROM TASK 2
+ // Create registration message object
+ SLPRegMsg reg = new SLPRegMsg();
+ // Fill registration message fields
+ reg.create(Integer.toString(this.myID));
+ // Create configuration object
+ this.phyConfig = new PhyConfiguration(rname, rp);
+
+ phy.send(new String(reg.getDataBytes()), this.phyConfig);
+
+ // Subtask 2: Receive response message, parse it, and inform app
+ boolean msgRegResponse;
+
+ // Parse message if error occurs throw RegistrationFailedExceoption
+ try {
+ SLPMsg msg = new SLPMsg();
+ msg = (SLPMsg) msg.parse(phy.receive(SLPTIMEOUT).getData());
+ msgRegResponse = ((SLPRegResponseMsg) msg).getRegResponse();
+ } catch (IllegalMsgException | SocketTimeoutException e) {
+ throw new RegistrationFailedException();
+ }
+
+ // If RegResponse was true conclude register else throw RegistrationFailedExceoption
+ if (msgRegResponse) {
+ this.isRegistered = true;
+ } else {
+ throw new RegistrationFailedException();
+ }
+ return;
+ ------------ CODE FROM TASK 2*/
+
+
+ // Updated registration using timeout
+ SLPRegMsg reg = new SLPRegMsg();
+ // Fill registration message fields
+ reg.create(Integer.toString(this.myID));
+ // Create configuration object
+ this.phyConfig = new PhyConfiguration(rname, rp);
+ // Counter for attempting registration
+ int attempt = 0;
+
+ while (attempt < 3) {
+
+ phy.send(new String(reg.getDataBytes()), this.phyConfig);
+
+ // Receive response message, parse it, and inform app
+ boolean msgRegResponse = false;
+
+ // Parse message if error occurs printStackTrace
+ try {
+ SLPMsg msg = new SLPMsg();
+ msg = (SLPMsg) msg.parse(phy.receive(SLPTIMEOUT).getData());
+ msgRegResponse = ((SLPRegResponseMsg) msg).getRegResponse();
+ } catch (IllegalMsgException | SocketTimeoutException e) {
+ e.printStackTrace();
+ }
+
+ // If RegResponse was true conclude register else increase number of attempts
+ if (msgRegResponse) {
+ this.isRegistered = true;
+ return;
+ }
+ attempt++;
+ }
+ throw new RegistrationFailedException();
+ }
- // Create SLPDataMsg object (subtask 3.3) and send
+ // Create SLPDataMsg object (subtask 3.3) and send
// Subtask 2.1
- @Override
- public void send(String s, Configuration config) throws IOException, IWProtocolException {
-
+ @Override
+ public void send(String sentence, Configuration config) throws IOException, IWProtocolException {
- }
+ // Send the message, if the Client has been registered
+ if (isRegistered) {
+ SLPDataMsg msg = new SLPDataMsg((SLPConfiguration) config, myID);
+ msg.create(sentence);
+ phy.send(new String(msg.getDataBytes()), phyConfig);
+ } else {
+ throw new RegistrationFailedException();
+ }
+ }
- // Receive message from underlying protocol, parse and process
+ // Receive message from underlying protocol, parse and process
// Subtask 2.2
- @Override
- public Msg receive() throws IOException, IWProtocolException {
- SLPMsg in = null;
+ @Override
+ public Msg receive() throws IOException, IWProtocolException {
+ SLPMsg respMsg;
+ Boolean isRunning = true;
+ // Check if the Client has been registered
+ if (isRegistered || isSwitch) {
+ while (isRunning) {
+ try {
+ Msg phyMsg;
+ if(useTimeout){
+ phyMsg = phy.receive(SLPTIMEOUT);
+ } else {
+ phyMsg = phy.receive();
+ }
+
+ // Receive message and parse it
+ respMsg = new SLPMsg();
+ respMsg = (SLPMsg) respMsg.parse(phyMsg.getData());
- return in;
- }
+ /* Is the parsed message a registration message?
+ If it is and it's a switch, register the Client. */
+ if (respMsg instanceof SLPRegMsg) {
+ if (!isSwitch) {
+ System.out.println("Client ist already registered -> Discard Message");
+ throw new IllegalMsgException();
+ } else {
+ registration((SLPRegMsg) respMsg, phyMsg.getConfiguration());
+ return null;
+ }
+ }
+ /* Was the message meant to be sent to client?
+ Drop it silently, if not. */
+ if (!isSwitch && ((SLPDataMsg) respMsg).getReceiverId() != this.myID) {
+ System.out.println(((SLPDataMsg) respMsg).getReceiverId() + " is someone else. I am " +this.myID);
+ throw new IllegalReceiveException();
+ }
+ return respMsg;
- public void storeAndForward() throws IOException {
- while (true) {
- forward();
- }
- }
+ } catch (BadChecksumException | IllegalMsgException | RegistrationFailedException |
+ IllegalReceiveException e) {
+ e.printStackTrace();
+ } catch (SocketTimeoutException e) {
+ isRunning = false;
+ }
+ }
+ throw new SocketTimeoutException();
+ } else {
+ throw new RegistrationFailedException();
+ }
- public void forward() throws IOException {
- // Subtask 3.2
- }
+ }
+
+ public void storeAndForward() throws IOException, IWProtocolException {
+ while (true) {
+ forward();
+ }
+ }
+
+ public void forward() throws IWProtocolException, IOException {
+
+ // Receive a message and if it was a registration message dont foward it
+ SLPMsg datMsg = (SLPMsg) this.receive();
+ if (datMsg == null) {
+ return;
+ }
+
+ // Get the PhyConfig of the receiver and sender by their IDs
+ PhyConfiguration receiverConfig = this.systems.get(((SLPDataMsg) datMsg).getReceiverId());
+ PhyConfiguration senderConfig = this.systems.get(((SLPDataMsg) datMsg).getSenderID());
+
+ // In case one of the clients isn't registered dont send the message else forwad it to the receiver
+ if (receiverConfig == null || senderConfig == null) {
+ System.out.println("Discarding message some clients not registered");
+ } else {
+ System.out.println("Forwarding message: '" + datMsg.getData() + "' with sender: " + ((SLPDataMsg) datMsg).getSenderID() + " and receiver: " + ((SLPDataMsg) datMsg).getReceiverId());
+ phy.send(((SLPDataMsg) datMsg).getreceivedMessage(), receiverConfig);
+ }
+
+
+ }
+
+ // Registration Method which is used by the switch to register new Clients to its Hashmap
+ private void registration(SLPRegMsg regMsg, Configuration config) throws IWProtocolException, IOException {
+ try {
+
+ SLPRegResponseMsg regResponseMsg = new SLPRegResponseMsg();
+
+ // Check whether Client is already registered to the ID if not put him into the Hashmap with his PhyConfig
+ if (this.systems.containsKey(regMsg.getSlpId())) {
+ regResponseMsg.setRegResponse(false);
+ } else {
+ this.systems.put(regMsg.getSlpId(), (PhyConfiguration) config);
+ regResponseMsg.setRegResponse(true);
+ System.out.println("Registered: " + regMsg.getSlpId());
+ }
+
+ // Create corresponding SLPRegResponseMsg and send it to the Client
+ regResponseMsg.create(Integer.toString(regMsg.getSlpId()));
+ phy.send(new String(regResponseMsg.getDataBytes()), config);
+
+ } catch (IllegalMsgException e) {
+ throw new RegistrationFailedException();
+ }
+ }
+
+ public PhyProtocol getPhy() {
+ return phy;
+ }
}
--
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