| /** |
| * 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.bookkeeper.mledger.offload; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.Collections; |
| import java.util.concurrent.CompletableFuture; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.mledger.LedgerOffloaderFactory; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.commons.lang3.tuple.Pair; |
| import org.apache.pulsar.common.nar.NarClassLoader; |
| import org.apache.pulsar.common.util.ObjectMapperFactory; |
| |
| /** |
| * Utils to load offloaders |
| */ |
| @Slf4j |
| public class OffloaderUtils { |
| |
| private static final String PULSAR_OFFLOADER_SERVICE_NAME = "pulsar-offloader.yaml"; |
| |
| /** |
| * Extract the Pulsar offloader class from a offloader archive. |
| * |
| * @param narPath nar package path |
| * @return the offloader class name |
| * @throws IOException when fail to retrieve the pulsar offloader class |
| */ |
| static Pair<NarClassLoader, LedgerOffloaderFactory> getOffloaderFactory(String narPath, String narExtractionDirectory) throws IOException { |
| // need to load offloader NAR to the classloader that also loaded LedgerOffloaderFactory in case |
| // LedgerOffloaderFactory is loaded by a classloader that is not the default classloader |
| // as is the case for the pulsar presto plugin |
| NarClassLoader ncl = NarClassLoader.getFromArchive(new File(narPath), Collections.emptySet(), |
| LedgerOffloaderFactory.class.getClassLoader(), narExtractionDirectory); |
| String configStr = ncl.getServiceDefinition(PULSAR_OFFLOADER_SERVICE_NAME); |
| |
| OffloaderDefinition conf = ObjectMapperFactory.getThreadLocalYaml() |
| .readValue(configStr, OffloaderDefinition.class); |
| if (StringUtils.isEmpty(conf.getOffloaderFactoryClass())) { |
| throw new IOException( |
| String.format("The '%s' offloader does not provide an offloader factory implementation", |
| conf.getName())); |
| } |
| |
| try { |
| // Try to load offloader factory class and check it implements Offloader interface |
| Class factoryClass = ncl.loadClass(conf.getOffloaderFactoryClass()); |
| CompletableFuture<LedgerOffloaderFactory> loadFuture = new CompletableFuture<>(); |
| Thread loadingThread = new Thread(() -> { |
| Thread.currentThread().setContextClassLoader(ncl); |
| try { |
| Object offloader = factoryClass.newInstance(); |
| if (!(offloader instanceof LedgerOffloaderFactory)) { |
| throw new IOException("Class " + conf.getOffloaderFactoryClass() + " does not implement interface " |
| + LedgerOffloaderFactory.class.getName()); |
| } |
| loadFuture.complete((LedgerOffloaderFactory) offloader); |
| } catch (Throwable t) { |
| loadFuture.completeExceptionally(t); |
| } |
| }, "load-factory-" + factoryClass); |
| try { |
| loadingThread.start(); |
| return Pair.of(ncl, loadFuture.get()); |
| } finally { |
| loadingThread.join(); |
| } |
| } catch (Throwable t) { |
| rethrowIOException(t); |
| } |
| return null; |
| } |
| |
| private static void rethrowIOException(Throwable cause) |
| throws IOException { |
| if (cause instanceof IOException) { |
| throw (IOException) cause; |
| } else if (cause instanceof RuntimeException) { |
| throw (RuntimeException) cause; |
| } else if (cause instanceof Error) { |
| throw (Error) cause; |
| } else { |
| throw new IOException(cause.getMessage(), cause); |
| } |
| } |
| |
| public static OffloaderDefinition getOffloaderDefinition(String narPath, String narExtractionDirectory) throws IOException { |
| try (NarClassLoader ncl = NarClassLoader.getFromArchive(new File(narPath), Collections.emptySet(), narExtractionDirectory)) { |
| String configStr = ncl.getServiceDefinition(PULSAR_OFFLOADER_SERVICE_NAME); |
| |
| return ObjectMapperFactory.getThreadLocalYaml().readValue(configStr, OffloaderDefinition.class); |
| } |
| } |
| |
| public static Offloaders searchForOffloaders(String offloadersPath, String narExtractionDirectory) throws IOException { |
| Path path = Paths.get(offloadersPath).toAbsolutePath(); |
| log.info("Searching for offloaders in {}", path); |
| |
| Offloaders offloaders = new Offloaders(); |
| |
| if (!path.toFile().exists()) { |
| log.warn("Offloaders archive directory not found"); |
| return offloaders; |
| } |
| |
| try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.nar")) { |
| stream.forEach(archive -> { |
| try { |
| OffloaderDefinition definition = getOffloaderDefinition(archive.toString(), narExtractionDirectory); |
| log.info("Found offloader {} from {}", definition, archive); |
| |
| if (!StringUtils.isEmpty(definition.getOffloaderFactoryClass())) { |
| // Validate offloader factory class to be present and of the right type |
| Pair<NarClassLoader, LedgerOffloaderFactory> offloaderFactoryPair = |
| getOffloaderFactory(archive.toString(), narExtractionDirectory); |
| if (null != offloaderFactoryPair) { |
| offloaders.getOffloaders().add(offloaderFactoryPair); |
| } |
| } |
| } catch (Throwable t) { |
| log.warn("Failed to load offloader from {}", archive, t); |
| } |
| }); |
| } |
| log.info("Found and loaded {} offloaders", offloaders.getOffloaders().size()); |
| return offloaders; |
| } |
| |
| |
| } |