/*
* 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.jclouds.chef.servlet;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Sets.newHashSet;
import static java.util.Collections.singleton;
import static org.jclouds.chef.config.ChefProperties.CHEF_NODE;
import static org.jclouds.chef.config.ChefProperties.CHEF_NODE_PATTERN;
import static org.jclouds.chef.config.ChefProperties.CHEF_RUN_LIST;
import static org.jclouds.chef.config.ChefProperties.CHEF_SERVICE_CLIENT;
import java.util.Properties;
import java.util.Set;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.jclouds.ContextBuilder;
import org.jclouds.chef.ChefApi;
import org.jclouds.chef.ChefApiMetadata;
import org.jclouds.chef.ChefContext;
import org.jclouds.chef.ChefService;
import org.jclouds.chef.domain.Node;
import org.jclouds.chef.servlet.functions.InitParamsToProperties;
import org.jclouds.logging.Logger;
import org.jclouds.logging.jdk.JDKLogger;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableSet;
import com.google.common.io.Closeables;
import com.google.inject.AbstractModule;
/**
* Registers a new node in Chef and binds its name to
* {@link ChefConstants.CHEF_NODE}, its role to {@link ChefConstants.CHEF_ROLE}
* and the {@link ChefService} for the client to
* {@link ChefConstants.CHEF_SERVICE_CLIENT} upon initialized. Deletes the node
* and client when the context is destroyed.
*
* @author Adrian Cole
*/
public class ChefRegistrationListener implements ServletContextListener {
private Logger logger = new JDKLogger.JDKLoggerFactory().getLogger(ChefRegistrationListener.class.getName());
@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
try {
logger.debug("starting initialization");
Properties overrides = InitParamsToProperties.INSTANCE.apply(servletContextEvent.getServletContext());
logger.trace("creating client connection");
ChefService client = createService(overrides, servletContextEvent);
logger.debug("created client connection");
Node node;
String nodeName;
while (true) {
nodeName = findNextNodeName(client, getInitParam(servletContextEvent, CHEF_NODE_PATTERN));
try {
node = client.createNodeAndPopulateAutomaticAttributes(nodeName,
Splitter.on(',').split(getInitParam(servletContextEvent, CHEF_RUN_LIST)));
break;
} catch (IllegalStateException ex) {
logger.debug("client already exists %s: %s", nodeName, ex.getMessage());
}
}
servletContextEvent.getServletContext().setAttribute(CHEF_NODE, node);
servletContextEvent.getServletContext().setAttribute(CHEF_SERVICE_CLIENT, client);
logger.debug("initialized");
} catch (RuntimeException e) {
logger.error(e, "error registering");
throw e;
}
}
private String findNextNodeName(ChefService client, String pattern) {
ChefApi api = client.getContext().getApi(ChefApi.class);
Set<String> nodes = api.listNodes();
String nodeName;
Set<String> names = newHashSet(nodes);
int index = 0;
while (true) {
nodeName = String.format(pattern, index++);
if (!names.contains(nodeName)) {
break;
}
}
return nodeName;
}
private ChefService createService(Properties props, final ServletContextEvent servletContextEvent) {
return ContextBuilder.newBuilder(new ChefApiMetadata()).modules(ImmutableSet.of(new AbstractModule() {
@Override
protected void configure() {
bind(ServletContext.class).toInstance(servletContextEvent.getServletContext());
}
})).overrides(props).buildView(ChefContext.class).getChefService();
}
private static String getInitParam(ServletContextEvent servletContextEvent, String name) {
return checkNotNull(servletContextEvent.getServletContext().getInitParameter(name));
}
@SuppressWarnings("unchecked")
private static <T> T getContextAttributeOrNull(ServletContextEvent servletContextEvent, String name) {
return (T) servletContextEvent.getServletContext().getAttribute(name);
}
/**
* removes the node and client if found, and closes the client context.
*/
@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
ChefService client = getContextAttributeOrNull(servletContextEvent, CHEF_SERVICE_CLIENT);
Node node = getContextAttributeOrNull(servletContextEvent, CHEF_NODE);
if (node != null && client != null) {
client.deleteAllNodesInList(singleton(node.getName()));
}
if (client != null) {
Closeables.closeQuietly(client.getContext());
}
}
}