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// Copyright (C) 2013 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.googlesource.gerrit.plugins.replication;
import com.google.gerrit.common.FileUtil;
import com.google.gerrit.extensions.annotations.PluginData;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.git.WorkQueue;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Singleton
public class AutoReloadConfigDecorator implements ReplicationConfig {
private static final Logger log = LoggerFactory.getLogger(AutoReloadConfigDecorator.class);
private ReplicationFileBasedConfig currentConfig;
private long currentConfigTs;
private final SitePaths site;
private final WorkQueue workQueue;
private final DestinationFactory destinationFactory;
private final Path pluginDataDir;
@Inject
public AutoReloadConfigDecorator(
SitePaths site,
WorkQueue workQueue,
DestinationFactory destinationFactory,
@PluginData Path pluginDataDir)
throws ConfigInvalidException, IOException {
this.site = site;
this.destinationFactory = destinationFactory;
this.pluginDataDir = pluginDataDir;
this.currentConfig = loadConfig();
this.currentConfigTs = getLastModified(currentConfig);
this.workQueue = workQueue;
}
private static long getLastModified(ReplicationFileBasedConfig cfg) {
return FileUtil.lastModified(cfg.getCfgPath());
}
private ReplicationFileBasedConfig loadConfig() throws ConfigInvalidException, IOException {
return new ReplicationFileBasedConfig(site, destinationFactory, pluginDataDir);
}
private synchronized boolean isAutoReload() {
return currentConfig.getConfig().getBoolean("gerrit", "autoReload", false);
}
@Override
public synchronized List<Destination> getDestinations(FilterType filterType) {
reloadIfNeeded();
return currentConfig.getDestinations(filterType);
}
private void reloadIfNeeded() {
try {
if (isAutoReload()) {
long lastModified = getLastModified(currentConfig);
if (lastModified > currentConfigTs) {
ReplicationFileBasedConfig newConfig = loadConfig();
newConfig.startup(workQueue);
int discarded = currentConfig.shutdown();
this.currentConfig = newConfig;
this.currentConfigTs = lastModified;
log.info(
"Configuration reloaded: {} destinations, {} replication events discarded",
currentConfig.getDestinations(FilterType.ALL).size(),
discarded);
}
}
} catch (Exception e) {
log.error("Cannot reload replication configuration: keeping existing settings", e);
return;
}
}
@Override
public synchronized boolean isReplicateAllOnPluginStart() {
return currentConfig.isReplicateAllOnPluginStart();
}
@Override
public synchronized boolean isDefaultForceUpdate() {
return currentConfig.isDefaultForceUpdate();
}
@Override
public synchronized boolean isEmpty() {
return currentConfig.isEmpty();
}
@Override
public Path getEventsDirectory() {
return currentConfig.getEventsDirectory();
}
@Override
public synchronized int shutdown() {
return currentConfig.shutdown();
}
@Override
public synchronized void startup(WorkQueue workQueue) {
currentConfig.startup(workQueue);
}
@Override
public synchronized int getSshConnectionTimeout() {
return currentConfig.getSshConnectionTimeout();
}
@Override
public synchronized int getSshCommandTimeout() {
return currentConfig.getSshCommandTimeout();
}
}
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