/*
*
* Copyright 2013 Justin Santa Barbara.
*
* 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.netflix.simianarmy.chaos;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.netflix.simianarmy.CloudClient;
import com.netflix.simianarmy.MonkeyConfiguration;
import com.netflix.simianarmy.basic.chaos.BasicChaosMonkey;
/**
* We force-detach all the EBS volumes.
*
* This is supposed to simulate a catastrophic failure of EBS, however the instance will (possibly) still keep running;
* e.g. it should continue to respond to pings.
*/
public class DetachVolumesChaosType extends ChaosType {
/** The Constant LOGGER. */
private static final Logger LOGGER = LoggerFactory.getLogger(BasicChaosMonkey.class);
/**
* Constructor.
*
* @param config
* Configuration to use
*/
public DetachVolumesChaosType(MonkeyConfiguration config) {
super(config, "DetachVolumes");
}
/**
* Strategy can be applied iff there are any EBS volumes attached.
*/
@Override
public boolean canApply(ChaosInstance instance) {
CloudClient cloudClient = instance.getCloudClient();
String instanceId = instance.getInstanceId();
List<String> volumes = cloudClient.listAttachedVolumes(instanceId, false);
if (volumes.isEmpty()) {
LOGGER.debug("Can't apply strategy: no non-root EBS volumes");
return false;
}
return super.canApply(instance);
}
/**
* Force-detaches all attached EBS volumes from the instance.
*/
@Override
public void apply(ChaosInstance instance) {
CloudClient cloudClient = instance.getCloudClient();
String instanceId = instance.getInstanceId();
// IDEA: We could have a strategy where we detach some of the volumes...
boolean force = true;
for (String volumeId : cloudClient.listAttachedVolumes(instanceId, false)) {
cloudClient.detachVolume(instanceId, volumeId, force);
}
}
}