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/*
* Copyright (C) 2008-2019, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.juick.server;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.model.Message;
import com.juick.model.User;
import com.juick.model.AnonymousUser;
import com.juick.server.api.SystemActivity;
import com.juick.service.MessagesService;
import com.juick.service.SubscriptionService;
import com.juick.service.UserService;
import com.juick.service.component.*;
import com.juick.util.MessageUtils;
import org.apache.commons.collections4.ListUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.stream.Collectors;
/**
* @author Ugnich Anton
*/
@Component
public class ServerManager implements NotificationListener {
private static final Logger logger = LoggerFactory.getLogger("Session");
@Inject
private MessagesService messagesService;
@Inject
private SubscriptionService subscriptionService;
@Inject
private UserService userService;
private final CopyOnWriteArrayList<EventSession> sessions = new CopyOnWriteArrayList<>();
@Value("${service_user:juick}")
private String serviceUsername;
private User serviceUser;
@PostConstruct
public void init() {
serviceUser = userService.getUserByName(serviceUsername);
}
private void onJuickPM(final User to, final Message jmsg) {
messageEvent(jmsg, Arrays.asList(to, jmsg.getUser()));
}
private void onJuickMessagePost(final Message jmsg, List<User> subscribedUsers) {
messageEvent(jmsg, subscribedUsers);
messageEvent(jmsg, Collections.singletonList(AnonymousUser.INSTANCE));
}
private void onJuickMessageReply(final Message jmsg, final List<User> subscribedUsers) {
messageEvent(jmsg, subscribedUsers);
messageEvent(jmsg, Collections.singletonList(AnonymousUser.INSTANCE));
}
@Override
public void processSystemEvent(@Nonnull SystemEvent systemEvent) {
var activity = systemEvent.getActivity();
var from = activity.getFrom();
var message = activity.getMessage();
var subscribers = activity.getTo();
if (activity.getType().equals(SystemActivity.ActivityType.message)) {
processMessage(from, message, subscribers);
} else if (activity.getType().equals(SystemActivity.ActivityType.like)) {
if (from.equals(serviceUser)) {
processTop(message);
}
}
}
private void processMessage(User from, Message jmsg, List<User> subscribers) {
List<User> subscribedUsers = ListUtils.union(subscribers, Collections.singletonList(jmsg.getUser()));
if (jmsg.isService()) {
logger.info("Message read event from {} for {}", from.getUid(), jmsg.getMid());
readEvent(jmsg, Collections.singletonList(serviceUser));
return;
}
if (MessageUtils.isPM(jmsg)) {
onJuickPM(jmsg.getTo(), jmsg);
} else if (!MessageUtils.isReply(jmsg)) {
onJuickMessagePost(jmsg, subscribedUsers);
} else {
// to get quote and attachment
Message op = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
subscriptionService.getUsersSubscribedToComments(op, jmsg, true).stream()
.filter(u -> userService.isReplyToBL(u, jmsg))
.forEach(b -> messagesService.setLastReadComment(b, jmsg.getMid(), jmsg.getRid()));
onJuickMessageReply(jmsg, subscribedUsers);
}
messageEvent(jmsg, Collections.singletonList(serviceUser));
}
@Override
public void processPingEvent(PingEvent pingEvent) {
}
private void processTop(Message msg) {
User topUser = msg.getUser();
topEvent(msg, Arrays.asList(topUser, serviceUser));
}
private void topEvent(Message msg, List<User> subscribers){
sendSseEvent(msg, "top", subscribers);
}
private void readEvent(Message msg, List<User> subscribers){
sendSseEvent(msg, "read", subscribers);
}
private void messageEvent(Message msg, List<User> subscribers) {
sendSseEvent(msg, "msg", subscribers);
}
private void sendSseEvent(Message msg, String name, List<User> subscribers) {
List<EventSession> deadEmitters = new ArrayList<>();
this.sessions.stream().filter(s -> subscribers.contains(s.user)).forEach(session -> {
try {
SseEmitter.SseEventBuilder builder = SseEmitter.event()
.name(name)
.data(msg);
session.getEmitter().send(builder);
} catch (Exception e) {
deadEmitters.add(session);
}
});
this.sessions.removeAll(deadEmitters);
}
public static class EventSession {
private final User user;
private final SseEmitter emitter;
public EventSession(User user, SseEmitter sseEmitter) {
this.user = user;
this.emitter = sseEmitter;
}
public User getUser() {
return user;
}
public SseEmitter getEmitter() {
return emitter;
}
}
public CopyOnWriteArrayList<EventSession> getSessions() {
return sessions;
}
@Scheduled(fixedRate = 30000)
public void ping() {
Message ping = new Message();
ping.setService(true);
sendSseEvent(ping, "ping", getSessions().stream().map(s -> s.user)
.distinct().collect(Collectors.toList()));
}
}
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