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Send Pending Messages After Successful Handshake (#111) 

Instead of caching pending messages during the handshake and relaying
them afterwards, they are now sent after the handshake has been
completed.

This is possible because the relevant processors (messages and status
changes) are now event handlers which are registered at the event bus,
which means that they can immediately react to pending messages even if
Client#initReceiver has not been fully executed yet.

Because Client#initReceiver exists for that very reason, it is no
longer necessary anymore. ID generator initialization, which was its other part,
is now directly handled in Startup#performHandshake, which is a far more
sensible placement.

Fixes #106

Reviewed-on: https://git.kske.dev/zdm/envoy/pulls/111
Reviewed-by: DieGurke <maxi@kske.dev>
This commit is contained in:
Kai S. K. Engelbart 2020-12-02 21:21:00 +01:00
parent 10213a0d3d
commit dcf1b0c58d
Signed by: Käfer & Engelbart Git
GPG Key ID: 70F2F9206EDC1FCE
3 changed files with 33 additions and 53 deletions
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40
client/src/main/java/envoy/client/net/Client.java
View File

@ -12,7 +12,7 @@ import envoy.data.*;
import envoy.event.*;
import envoy.util.*;
import envoy.client.data.*;
import envoy.client.data.ClientConfig;
import envoy.client.event.EnvoyCloseEvent;
/**
@ -55,13 +55,12 @@ public final class Client implements EventListener, Closeable {
* the handshake does exceed this time limit, an exception is thrown.
*
* @param credentials the login credentials of the user
* @param cacheMap the map of all caches needed
* @throws TimeoutException if the server could not be reached
* @throws IOException if the login credentials could not be written
* @throws InterruptedException if the current thread is interrupted while waiting for the
* handshake response
*/
public void performHandshake(LoginCredentials credentials, CacheMap cacheMap)
public void performHandshake(LoginCredentials credentials)
throws TimeoutException, IOException, InterruptedException {
if (online)
throw new IllegalStateException("Handshake has already been performed successfully");
@ -79,7 +78,6 @@ public final class Client implements EventListener, Closeable {
// Register user creation processor, contact list processor, message cache and
// authentication token
receiver.registerProcessor(User.class, sender -> this.sender = sender);
receiver.registerProcessors(cacheMap.getMap());
// Start receiver
receiver.start();
@ -101,42 +99,18 @@ public final class Client implements EventListener, Closeable {
if (System.currentTimeMillis() - start > 5000) {
rejected = true;
socket.close();
receiver.removeAllProcessors();
throw new TimeoutException("Did not log in after 5 seconds");
}
Thread.sleep(500);
}
online = true;
logger.log(Level.INFO, "Handshake completed.");
}
/**
* Initializes the {@link Receiver} used to process data sent from the server to this client.
*
* @param localDB the local database used to persist the current {@link IDGenerator}
* @param cacheMap the map of all caches needed
* @throws IOException if no {@link IDGenerator} is present and none could be requested from the
* server
* @since Envoy Client v0.2-alpha
*/
public void initReceiver(LocalDB localDB, CacheMap cacheMap) throws IOException {
checkOnline();
// Remove all processors as they are only used during the handshake
// Remove handshake specific processors
receiver.removeAllProcessors();
// Relay cached messages and message status changes
cacheMap.get(Message.class).setProcessor(eventBus::dispatch);
cacheMap.get(GroupMessage.class).setProcessor(eventBus::dispatch);
cacheMap.get(MessageStatusChange.class).setProcessor(eventBus::dispatch);
cacheMap.get(GroupMessageStatusChange.class).setProcessor(eventBus::dispatch);
// Request a generator if none is present or the existing one is consumed
if (!localDB.hasIDGenerator() || !localDB.getIDGenerator().hasNext())
requestIDGenerator();
// Relay caches
cacheMap.getMap().values().forEach(Cache::relay);
online = true;
logger.log(Level.INFO, "Handshake completed.");
}
/**

15
client/src/main/java/envoy/client/ui/Startup.java
View File

@ -12,7 +12,7 @@ import javafx.stage.Stage;
import envoy.data.*;
import envoy.data.User.UserStatus;
import envoy.event.*;
import envoy.event.UserStatusChange;
import envoy.exception.EnvoyException;
import envoy.util.EnvoyLog;
@ -115,21 +115,20 @@ public final class Startup extends Application {
* @since Envoy Client v0.2-beta
*/
public static boolean performHandshake(LoginCredentials credentials) {
final var cacheMap = new CacheMap();
cacheMap.put(Message.class, new Cache<Message>());
cacheMap.put(GroupMessage.class, new Cache<GroupMessage>());
cacheMap.put(MessageStatusChange.class, new Cache<MessageStatusChange>());
cacheMap.put(GroupMessageStatusChange.class, new Cache<GroupMessageStatusChange>());
final var originalStatus =
localDB.getUser() == null ? UserStatus.ONLINE : localDB.getUser().getStatus();
try {
client.performHandshake(credentials, cacheMap);
client.performHandshake(credentials);
if (client.isOnline()) {
// Restore the original status as the server automatically returns status ONLINE
client.getSender().setStatus(originalStatus);
loadChatScene();
client.initReceiver(localDB, cacheMap);
// Request an ID generator if none is present or the existing one is consumed
if (!localDB.hasIDGenerator() || !localDB.getIDGenerator().hasNext())
client.requestIDGenerator();
return true;
} else
return false;

29
server/src/main/java/envoy/server/processors/LoginCredentialProcessor.java
View File

@ -40,6 +40,7 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
// Cache this write proxy for user-independent notifications
UserStatusChangeProcessor.setWriteProxy(writeProxy);
// Check for compatible versions
if (!VersionUtil.verifyCompatibility(credentials.getClientVersion())) {
logger.info("The client has the wrong version.");
writeProxy.write(socketID, new HandshakeRejection(WRONG_VERSION));
@ -70,10 +71,10 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
writeProxy.write(socketID, new HandshakeRejection(INVALID_TOKEN));
return;
}
} else
} else if (!PasswordUtil.validate(credentials.getPassword(),
user.getPasswordHash())) {
// Check the password hash
if (!PasswordUtil.validate(credentials.getPassword(), user.getPasswordHash())) {
logger.info(user + " has entered the wrong password.");
writeProxy.write(socketID, new HandshakeRejection(WRONG_PASSWORD_OR_USER));
return;
@ -101,7 +102,8 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
writeProxy.write(socketID, new HandshakeRejection(USERNAME_TAKEN));
return;
} catch (final NoResultException e) {
// Creation of a new user
// Create a new user
user = new User();
user.setName(credentials.getIdentifier());
user.setLastSeen(Instant.now());
@ -138,6 +140,15 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
persistenceManager.updateContact(user);
writeProxy.write(socketID, new NewAuthToken(token));
}
// Notify the user if a contact deletion has happened since he last logged in
if (user.getLatestContactDeletion().isAfter(user.getLastSeen()))
writeProxy.write(socketID, new ContactsChangedSinceLastLogin());
// Complete the handshake
writeProxy.write(socketID, user.toCommon());
// Send pending (group) messages and status changes
final var pendingMessages =
PersistenceManager.getInstance().getPendingMessages(user, credentials.getLastSync());
pendingMessages.removeIf(GroupMessage.class::isInstance);
@ -162,9 +173,10 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
writeProxy.write(connectionManager.getSocketID(msg.getSender().getID()),
new MessageStatusChange(msgCommon));
}
} else
} else {
writeProxy.write(socketID, new MessageStatusChange(msgCommon));
}
}
final List<GroupMessage> pendingGroupMessages = PersistenceManager.getInstance()
.getPendingGroupMessages(user, credentials.getLastSync());
@ -197,10 +209,11 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
}
PersistenceManager.getInstance().updateMessage(gmsg);
} else
} else {
// Just send the message without updating if it was received in the past
writeProxy.write(socketID, gmsgCommon);
}
} else {
// Sending group message status changes
@ -220,11 +233,5 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
writeProxy.write(socketID, new MessageStatusChange(gmsgCommon));
}
}
// Notify the user if a contact deletion has happened since he last logged in
if (user.getLatestContactDeletion().isAfter(user.getLastSeen()))
writeProxy.write(socketID, new ContactsChangedSinceLastLogin());
// Complete the handshake
writeProxy.write(socketID, user.toCommon());
}
}