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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.plugin.discovery.gce;
import com.google.api.client.http.HttpHeaders;
import com.google.api.client.util.ClassInfo;
import org.elasticsearch.SpecialPermission;
import org.elasticsearch.cloud.gce.GceComputeService;
import org.elasticsearch.cloud.gce.GceModule;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.LifecycleComponent;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.DiscoveryModule;
import org.elasticsearch.discovery.gce.GceDiscovery;
import org.elasticsearch.discovery.gce.GceUnicastHostsProvider;
import org.elasticsearch.plugins.Plugin;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class GceDiscoveryPlugin extends Plugin {
static {
/*
* GCE's http client changes access levels because its silly and we
* can't allow that on any old stack stack so we pull it here, up front,
* so we can cleanly check the permissions for it. Without this changing
* the permission can fail if any part of core is on the stack because
* our plugin permissions don't allow core to "reach through" plugins to
* change the permission. Because that'd be silly.
*/
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new SpecialPermission());
}
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
public Void run() {
ClassInfo.of(HttpHeaders.class, true);
return null;
}
});
}
private final Settings settings;
protected final ESLogger logger = Loggers.getLogger(GceDiscoveryPlugin.class);
public GceDiscoveryPlugin(Settings settings) {
this.settings = settings;
}
@Override
public String name() {
return "discovery-gce";
}
@Override
public String description() {
return "Cloud Google Compute Engine Discovery Plugin";
}
@Override
public Collection<Module> nodeModules() {
List<Module> modules = new ArrayList<>();
if (isDiscoveryAlive(settings, logger)) {
modules.add(new GceModule());
}
return modules;
}
@Override
public Collection<Class<? extends LifecycleComponent>> nodeServices() {
Collection<Class<? extends LifecycleComponent>> services = new ArrayList<>();
if (isDiscoveryAlive(settings, logger)) {
services.add(GceModule.getComputeServiceImpl());
}
return services;
}
public void onModule(DiscoveryModule discoveryModule) {
if (isDiscoveryAlive(settings, logger)) {
discoveryModule.addDiscoveryType("gce", GceDiscovery.class);
discoveryModule.addUnicastHostProvider(GceUnicastHostsProvider.class);
}
}
/**
* Check if discovery is meant to start
*
* @return true if we can start gce discovery features
*/
public static boolean isDiscoveryAlive(Settings settings, ESLogger logger) {
// User set discovery.type: gce
if (GceDiscovery.GCE.equalsIgnoreCase(settings.get("discovery.type")) == false) {
logger.debug("discovery.type not set to {}", GceDiscovery.GCE);
return false;
}
if (checkProperty(GceComputeService.Fields.PROJECT, settings.get(GceComputeService.Fields.PROJECT), logger) == false ||
checkProperty(GceComputeService.Fields.ZONE, settings.getAsArray(GceComputeService.Fields.ZONE), logger) == false) {
logger.debug("one or more gce discovery settings are missing. " +
"Check elasticsearch.yml file. Should have [{}] and [{}].",
GceComputeService.Fields.PROJECT,
GceComputeService.Fields.ZONE);
return false;
}
logger.trace("all required properties for gce discovery are set!");
return true;
}
private static boolean checkProperty(String name, String value, ESLogger logger) {
if (!Strings.hasText(value)) {
logger.warn("{} is not set.", name);
return false;
}
return true;
}
private static boolean checkProperty(String name, String[] values, ESLogger logger) {
if (values == null || values.length == 0) {
logger.warn("{} is not set.", name);
return false;
}
return true;
}
}
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