/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.whirr;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import java.io.IOException;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import org.apache.whirr.actions.BootstrapClusterAction;
import org.apache.whirr.actions.ConfigureClusterAction;
import org.apache.whirr.actions.DestroyClusterAction;
import org.apache.whirr.service.ClusterStateStore;
import org.apache.whirr.service.ClusterStateStoreFactory;
import org.apache.whirr.service.ClusterActionHandler;
import org.apache.whirr.service.ComputeCache;
import org.jclouds.compute.ComputeService;
import org.jclouds.compute.ComputeServiceContext;
import org.jclouds.compute.RunScriptOnNodesException;
import org.jclouds.compute.domain.ComputeMetadata;
import org.jclouds.compute.domain.ExecResponse;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.NodeState;
import org.jclouds.domain.Credentials;
import org.jclouds.scriptbuilder.domain.Statement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.whirr.RolePredicates.withIds;
import static org.jclouds.compute.options.RunScriptOptions.Builder.overrideCredentialsWith;
/**
* This class is used to start and stop clusters.
*/
public class ClusterController {
private static final Logger LOG = LoggerFactory.getLogger(ClusterController.class);
private final Function<ClusterSpec, ComputeServiceContext> getCompute;
private final ClusterStateStoreFactory stateStoreFactory;
public ClusterController() {
this(ComputeCache.INSTANCE, new ClusterStateStoreFactory());
}
public ClusterController(Function<ClusterSpec, ComputeServiceContext> getCompute,
ClusterStateStoreFactory stateStoreFactory) {
this.getCompute = getCompute;
this.stateStoreFactory = stateStoreFactory;
}
/**
* @return the unique name of the service.
*/
public String getName() {
throw new UnsupportedOperationException("No service name");
}
/**
* @return compute service contexts for use in managing the service
*/
protected Function<ClusterSpec, ComputeServiceContext> getCompute() {
return getCompute;
}
/**
* Start the cluster described by <code>clusterSpec</code> and block until the
* cluster is
* available. It is not guaranteed that the service running on the cluster
* has started when this method returns.
* @param clusterSpec
* @return an object representing the running cluster
* @throws IOException if there is a problem while starting the cluster. The
* cluster may or may not have started.
* @throws InterruptedException if the thread is interrupted.
*/
public Cluster launchCluster(ClusterSpec clusterSpec)
throws IOException, InterruptedException {
Map<String, ClusterActionHandler> handlerMap = new HandlerMapFactory().create();
BootstrapClusterAction bootstrapper = new BootstrapClusterAction(getCompute(), handlerMap);
Cluster cluster = bootstrapper.execute(clusterSpec, null);
ConfigureClusterAction configurer = new ConfigureClusterAction(getCompute(), handlerMap);
cluster = configurer.execute(clusterSpec, cluster);
stateStoreFactory.create(clusterSpec).save(cluster);
return cluster;
}
/**
* Stop the cluster and destroy all resources associated with it.
*
* @throws IOException if there is a problem while stopping the cluster. The
* cluster may or may not have been stopped.
* @throws InterruptedException if the thread is interrupted.
*/
public void destroyCluster(ClusterSpec clusterSpec) throws IOException,
InterruptedException {
DestroyClusterAction destroyer = new DestroyClusterAction(getCompute());
destroyer.execute(clusterSpec, null);
stateStoreFactory.create(clusterSpec).destroy();
}
public void destroyInstance(ClusterSpec clusterSpec, String instanceId) throws IOException {
LOG.info("Destroying instance {}", instanceId);
/* Destroy the instance */
ComputeService computeService = getCompute().apply(clusterSpec).getComputeService();
computeService.destroyNode(instanceId);
/* .. and update the cluster state storage */
ClusterStateStore store = stateStoreFactory.create(clusterSpec);
Cluster cluster = store.load();
cluster.removeInstancesMatching(withIds(instanceId));
store.save(cluster);
LOG.info("Instance {} destroyed", instanceId);
}
public Map<? extends NodeMetadata, ExecResponse> runScriptOnNodesMatching(ClusterSpec spec,
Predicate<NodeMetadata> condition, Statement statement) throws IOException, RunScriptOnNodesException {
Credentials credentials = new Credentials(spec.getClusterUser(), spec.getPrivateKey());
ComputeServiceContext context = getCompute().apply(spec);
condition = Predicates.and(runningInGroup(spec.getClusterName()), condition);
return context.getComputeService().runScriptOnNodesMatching(condition,
statement, overrideCredentialsWith(credentials).wrapInInitScript(false).runAsRoot(false));
}
@Deprecated
public Set<? extends NodeMetadata> getNodes(ClusterSpec clusterSpec)
throws IOException, InterruptedException {
ComputeService computeService = getCompute().apply(clusterSpec).getComputeService();
return computeService.listNodesDetailsMatching(
runningInGroup(clusterSpec.getClusterName()));
}
public Set<Cluster.Instance> getInstances(ClusterSpec spec)
throws IOException, InterruptedException {
return getInstances(spec, null);
}
public Set<Cluster.Instance> getInstances(ClusterSpec spec, ClusterStateStore stateStore)
throws IOException, InterruptedException {
Set<Cluster.Instance> instances = Sets.newLinkedHashSet();
Cluster cluster = (stateStore != null) ? stateStore.load() : null;
for(NodeMetadata node : getNodes(spec)) {
instances.add(toInstance(node, cluster, spec));
}
return instances;
}
private Cluster.Instance toInstance(NodeMetadata metadata, Cluster cluster, ClusterSpec spec) {
Credentials credentials = new Credentials(spec.getClusterUser(), spec.getPrivateKey());
Set<String> roles = Sets.newHashSet();
try {
if (cluster != null) {
roles = cluster.getInstanceMatching(withIds(metadata.getId())).getRoles();
}
} catch(NoSuchElementException e) {}
return new Cluster.Instance(credentials, roles,
Iterables.getFirst(metadata.getPublicAddresses(), null),
Iterables.getFirst(metadata.getPrivateAddresses(), null),
metadata.getId(), metadata);
}
public static Predicate<ComputeMetadata> runningInGroup(final String group) {
return new Predicate<ComputeMetadata>() {
@Override
public boolean apply(ComputeMetadata computeMetadata) {
// Not all list calls return NodeMetadata (e.g. VCloud)
if (computeMetadata instanceof NodeMetadata) {
NodeMetadata nodeMetadata = (NodeMetadata) computeMetadata;
return group.equals(nodeMetadata.getGroup())
&& nodeMetadata.getState() == NodeState.RUNNING;
}
return false;
}
@Override
public String toString() {
return "runningInGroup(" + group + ")";
}
};
}
}