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// Copyright (C) 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.mail.receive;
import com.google.common.annotations.VisibleForTesting;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.server.git.WorkQueue;
import com.google.gerrit.server.mail.EmailSettings;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.Future;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** MailReceiver implements base functionality for receiving emails. */
public abstract class MailReceiver implements LifecycleListener {
private static final Logger log = LoggerFactory.getLogger(MailReceiver.class);
protected EmailSettings mailSettings;
protected Set<String> pendingDeletion;
private MailProcessor mailProcessor;
private WorkQueue workQueue;
private Timer timer;
public static class Module extends LifecycleModule {
private final EmailSettings mailSettings;
@Inject
Module(EmailSettings mailSettings) {
this.mailSettings = mailSettings;
}
@Override
protected void configure() {
if (mailSettings.protocol == Protocol.NONE) {
return;
}
listener().to(MailReceiver.class);
switch (mailSettings.protocol) {
case IMAP:
bind(MailReceiver.class).to(ImapMailReceiver.class);
break;
case POP3:
bind(MailReceiver.class).to(Pop3MailReceiver.class);
break;
case NONE:
default:
}
}
}
MailReceiver(EmailSettings mailSettings, MailProcessor mailProcessor, WorkQueue workQueue) {
this.mailSettings = mailSettings;
this.mailProcessor = mailProcessor;
this.workQueue = workQueue;
pendingDeletion = Collections.synchronizedSet(new HashSet<>());
}
@Override
public void start() {
if (timer == null) {
timer = new Timer();
} else {
timer.cancel();
}
timer.scheduleAtFixedRate(
new TimerTask() {
@Override
public void run() {
MailReceiver.this.handleEmails(true);
}
},
0L,
mailSettings.fetchInterval);
}
@Override
public void stop() {
if (timer != null) {
timer.cancel();
}
}
/**
* requestDeletion will enqueue an email for deletion and delete it the next time we connect to
* the email server. This does not guarantee deletion as the Gerrit instance might fail before we
* connect to the email server.
*
* @param messageId
*/
public void requestDeletion(String messageId) {
pendingDeletion.add(messageId);
}
/**
* handleEmails will open a connection to the mail server, remove emails where deletion is
* pending, read new email and close the connection.
*
* @param async Determines if processing messages should happen asynchronous.
*/
@VisibleForTesting
public abstract void handleEmails(boolean async);
protected void dispatchMailProcessor(List<MailMessage> messages, boolean async) {
for (MailMessage m : messages) {
if (async) {
@SuppressWarnings("unused")
Future<?> possiblyIgnoredError =
workQueue
.getDefaultQueue()
.submit(
() -> {
try {
mailProcessor.process(m);
requestDeletion(m.id());
} catch (OrmException e) {
log.error("Mail: Can't process message " + m.id() + " . Won't delete.", e);
}
});
} else {
// Synchronous processing is used only in tests.
try {
mailProcessor.process(m);
requestDeletion(m.id());
} catch (OrmException e) {
log.error("Mail: Can't process messages. Won't delete.", e);
}
}
}
}
}
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