| /* |
| * 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.fluo.core.util; |
| |
| import java.nio.charset.StandardCharsets; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.collect.ImmutableList; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.api.ACLProvider; |
| import org.apache.curator.framework.recipes.cache.ChildData; |
| import org.apache.curator.framework.recipes.cache.NodeCache; |
| import org.apache.curator.framework.recipes.nodes.PersistentNode; |
| import org.apache.curator.retry.ExponentialBackoffRetry; |
| import org.apache.fluo.accumulo.util.ZookeeperPath; |
| import org.apache.fluo.accumulo.util.ZookeeperUtil; |
| import org.apache.fluo.api.config.FluoConfiguration; |
| import org.apache.fluo.core.impl.Environment; |
| import org.apache.zookeeper.CreateMode; |
| import org.apache.zookeeper.KeeperException; |
| import org.apache.zookeeper.ZooDefs; |
| import org.apache.zookeeper.ZooDefs.Perms; |
| import org.apache.zookeeper.data.ACL; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class CuratorUtil { |
| |
| private static final Logger log = LoggerFactory.getLogger(CuratorUtil.class); |
| |
| public enum NodeExistsPolicy { |
| SKIP, OVERWRITE, FAIL |
| } |
| |
| private CuratorUtil() {} |
| |
| /** |
| * Creates a curator built using Application's zookeeper connection string. Root path will start |
| * at Fluo application chroot. |
| */ |
| public static CuratorFramework newAppCurator(FluoConfiguration config) { |
| return newCurator(config.getAppZookeepers(), config.getZookeeperTimeout(), |
| config.getZookeeperSecret()); |
| } |
| |
| /** |
| * Creates a curator built using Fluo's zookeeper connection string. Root path will start at Fluo |
| * chroot. |
| */ |
| public static CuratorFramework newFluoCurator(FluoConfiguration config) { |
| return newCurator(config.getInstanceZookeepers(), config.getZookeeperTimeout(), |
| config.getZookeeperSecret()); |
| } |
| |
| /** |
| * Creates a curator built using Fluo's zookeeper connection string. Root path will start at root |
| * "/" of Zookeeper. |
| */ |
| public static CuratorFramework newRootFluoCurator(FluoConfiguration config) { |
| return newCurator(ZookeeperUtil.parseServers(config.getInstanceZookeepers()), |
| config.getZookeeperTimeout(), config.getZookeeperSecret()); |
| } |
| |
| private static final List<ACL> CREATOR_ALL_ACL = |
| ImmutableList.of(new ACL(Perms.ALL, ZooDefs.Ids.AUTH_IDS)); |
| |
| private static final List<ACL> PUBLICLY_READABLE_ACL = ImmutableList.of( |
| new ACL(Perms.READ, ZooDefs.Ids.ANYONE_ID_UNSAFE), new ACL(Perms.ALL, ZooDefs.Ids.AUTH_IDS)); |
| |
| /** |
| * Creates a curator built using the given zookeeper connection string and timeout |
| */ |
| public static CuratorFramework newCurator(String zookeepers, int timeout, String secret) { |
| |
| final ExponentialBackoffRetry retry = new ExponentialBackoffRetry(1000, 10); |
| if (secret.isEmpty()) { |
| return CuratorFrameworkFactory.newClient(zookeepers, timeout, timeout, retry); |
| } else { |
| return CuratorFrameworkFactory.builder().connectString(zookeepers) |
| .connectionTimeoutMs(timeout).sessionTimeoutMs(timeout).retryPolicy(retry) |
| .authorization("digest", ("fluo:" + secret).getBytes(StandardCharsets.UTF_8)) |
| .aclProvider(new ACLProvider() { |
| @Override |
| public List<ACL> getDefaultAcl() { |
| return CREATOR_ALL_ACL; |
| } |
| |
| @Override |
| public List<ACL> getAclForPath(String path) { |
| switch (path) { |
| case ZookeeperPath.ORACLE_GC_TIMESTAMP: |
| // The garbage collection iterator running in Accumulo tservers needs to read this |
| // value w/o authenticating. |
| return PUBLICLY_READABLE_ACL; |
| default: |
| return CREATOR_ALL_ACL; |
| } |
| } |
| }).build(); |
| } |
| } |
| |
| public static boolean putData(CuratorFramework curator, String zPath, byte[] data, |
| NodeExistsPolicy policy) throws KeeperException, InterruptedException { |
| if (policy == null) { |
| policy = NodeExistsPolicy.FAIL; |
| } |
| |
| while (true) { |
| try { |
| curator.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath(zPath, |
| data); |
| return true; |
| } catch (Exception nee) { |
| if (nee instanceof KeeperException.NodeExistsException) { |
| switch (policy) { |
| case SKIP: |
| return false; |
| case OVERWRITE: |
| try { |
| curator.setData().withVersion(-1).forPath(zPath, data); |
| return true; |
| } catch (Exception nne) { |
| |
| if (nne instanceof KeeperException.NoNodeException) { |
| // node delete between create call and set data, so try create call again |
| continue; |
| } else { |
| throw new RuntimeException(nne); |
| } |
| } |
| default: |
| throw (KeeperException.NodeExistsException) nee; |
| } |
| } else { |
| throw new RuntimeException(nee); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Starts the ephemeral node and waits for it to be created |
| * |
| * @param node Node to start |
| * @param maxWaitSec Maximum time in seconds to wait |
| */ |
| public static void startAndWait(PersistentNode node, int maxWaitSec) { |
| node.start(); |
| int waitTime = 0; |
| try { |
| while (node.waitForInitialCreate(1, TimeUnit.SECONDS) == false) { |
| waitTime += 1; |
| log.info("Waited " + waitTime + " sec for ephemeral node to be created"); |
| if (waitTime > maxWaitSec) { |
| throw new IllegalStateException("Failed to create ephemeral node"); |
| } |
| } |
| } catch (InterruptedException e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| |
| /** |
| * Start watching the fluo app uuid. If it changes or goes away then halt the process. |
| */ |
| public static NodeCache startAppIdWatcher(Environment env) { |
| try { |
| CuratorFramework curator = env.getSharedResources().getCurator(); |
| |
| byte[] uuidBytes = curator.getData().forPath(ZookeeperPath.CONFIG_FLUO_APPLICATION_ID); |
| if (uuidBytes == null) { |
| Halt.halt("Fluo Application UUID not found"); |
| throw new RuntimeException(); // make findbugs happy |
| } |
| |
| final String uuid = new String(uuidBytes, StandardCharsets.UTF_8); |
| |
| final NodeCache nodeCache = new NodeCache(curator, ZookeeperPath.CONFIG_FLUO_APPLICATION_ID); |
| nodeCache.getListenable().addListener(() -> { |
| ChildData node = nodeCache.getCurrentData(); |
| if (node == null || !uuid.equals(new String(node.getData(), StandardCharsets.UTF_8))) { |
| Halt.halt("Fluo Application UUID has changed or disappeared"); |
| } |
| }); |
| nodeCache.start(); |
| return nodeCache; |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |