org.apache.whirr.service.chef.ChefClusterActionHandler.java Source code

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Here is the source code for org.apache.whirr.service.chef.ChefClusterActionHandler.java

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/**
 * 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.service.chef;

import static org.apache.whirr.service.chef.ChefClusterActionHandlerFactory.CHEF_ROLE_PREFIX;
import static org.jclouds.scriptbuilder.domain.Statements.call;

import java.io.IOException;

import org.apache.whirr.service.ClusterActionEvent;
import org.apache.whirr.service.ClusterActionHandlerSupport;

import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;

/**
 * Installs chef-solo provisioned services, chef itself and its dependencies.
 * 
 */
public class ChefClusterActionHandler extends ClusterActionHandlerSupport {

    public static final String CHEF_SLEEP_AFTER_RECIPE = "whirr.chef.recipe.sleep";
    public static final long CHEF_SLEEP_AFTER_RECIPE_DEFAULT = 2000L;

    private String role;
    private String cookbook;
    private String recipe;
    private long sleepAfterConfigure;

    public ChefClusterActionHandler(String role) {
        this.role = role;
        parseCookbookAndRecipe();
    }

    @Override
    public String getRole() {
        return role;
    }

    @Override
    protected void beforeBootstrap(ClusterActionEvent event) throws IOException, InterruptedException {
        if (isFirstChefRoleIn(event.getInstanceTemplate().getRoles()).apply(role)) {
            addInstallChefStatements(event);
            // for some reason even non-running recipes like ant are sometimes not
            // immediately available after install. Jclouds seems to be behaving fine
            // and file system stores should be atomic wrt to visibility, but there
            // might be refresh or memory visibility issues wrt to how path context is
            // built or maintained. Until the issue is dug up a small sleep time
            // should take care of it
            sleepAfterConfigure = event.getClusterSpec().getConfiguration().getLong(CHEF_SLEEP_AFTER_RECIPE,
                    CHEF_SLEEP_AFTER_RECIPE_DEFAULT);
        }
    }

    @Override
    protected void beforeConfigure(ClusterActionEvent event) throws IOException, InterruptedException {
        // if the role is an exact match to the prefix then there is nothing to
        // do (chef only installation)
        if (role.equals("")) {
            return;
        }
        addStatement(event,
                new Recipe(cookbook, recipe, event.getClusterSpec().getConfigurationForKeysWithPrefix(cookbook)));
    }

    private void addInstallChefStatements(ClusterActionEvent event) {
        // install ruby and ruby-gems in the nodes
        addStatement(event, call("install_ruby"));
        // install git
        addStatement(event, call("install_git"));
        // install chef-solo
        addStatement(event, call("install_chef"));
    }

    @Override
    protected void afterConfigure(ClusterActionEvent event) throws IOException, InterruptedException {
        Thread.sleep(sleepAfterConfigure);
    }

    private void parseCookbookAndRecipe() {
        String[] both = this.role.trim().split(":");
        if (both.length < 1 || both.length > 3) {
            throw new IllegalArgumentException(
                    "Chef roles must be specified the following way: \"chef\" to install chef with no recipes,"
                            + " \"chef:cookbook_name\" to install the default recipe in the provided cookbook,"
                            + " or \"chef:cookbook_name:recipe_name\" to  install a particular recipe [was: " + role
                            + "]");
        }
        switch (both.length) {
        case 3:
            recipe = both[2];
        case 2:
            cookbook = both[1];
        }
    }

    private static Predicate<String> isFirstChefRoleIn(final Iterable<String> roles) {
        return new Predicate<String>() {
            @Override
            public boolean apply(String arg0) {
                return Iterables
                        .get(Iterables.filter(roles, Predicates.containsPattern("^" + CHEF_ROLE_PREFIX + arg0)), 0)
                        .equals(CHEF_ROLE_PREFIX + arg0);
            }

            @Override
            public String toString() {
                return "isFirstChefRoleIn(" + roles + ")";

            }
        };
    }

}