| /** |
| * 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.metron.stellar.dsl.functions.resolver; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import org.apache.commons.vfs2.FileObject; |
| import org.apache.commons.vfs2.FileSystemException; |
| import org.apache.commons.vfs2.impl.VFSClassLoader; |
| import org.apache.metron.stellar.common.utils.ConversionUtils; |
| import org.apache.metron.stellar.common.utils.VFSClassloaderUtil; |
| import org.apache.metron.stellar.dsl.Context; |
| import org.apache.metron.stellar.dsl.Stellar; |
| import org.apache.metron.stellar.dsl.StellarFunction; |
| |
| import org.atteo.classindex.ClassIndex; |
| import org.reflections.util.FilterBuilder; |
| |
| import static org.apache.metron.stellar.dsl.Context.Capabilities.STELLAR_CONFIG; |
| import static org.apache.metron.stellar.dsl.functions.resolver.ClasspathFunctionResolver.Config.STELLAR_SEARCH_EXCLUDES_KEY; |
| import static org.apache.metron.stellar.dsl.functions.resolver.ClasspathFunctionResolver.Config.STELLAR_SEARCH_INCLUDES_KEY; |
| import static org.apache.metron.stellar.dsl.functions.resolver.ClasspathFunctionResolver.Config.STELLAR_VFS_PATHS; |
| |
| /** |
| * Performs function resolution for Stellar by searching the classpath. |
| * |
| * By default, the entire classpath will be searched for Stellar functions. At times, |
| * this can take quite a while. To shorten the search time, a property can be |
| * defined to either include or exclude certain packages. The fewer packages there are |
| * to search, the quicker the search will be. |
| * |
| * The properties are pulled from the Context's 'STELLAR_CONFIG'. In the REPL, this |
| * is defined in a file called 'stellar.properties' on the classpath. |
| * |
| * The following property definition will include only Stellar functions that are |
| * part of Apache Metron. |
| * |
| * stellar.function.resolver.includes = org.apache.metron.* |
| * |
| * The following property definition will exclude Stellar functions that are part of |
| * Metron's management suite of function. |
| * |
| * stellar.function.resolver.excludes = org.apache.metron.management.* |
| * |
| * The following property definition would also exclude the Stellar functions that are |
| * part of the management suite of functions. Of course, this may also exclude other |
| * packages, but this serves as an example of the types of expression that can be used. |
| * |
| * stellar.function.resolver.excludes = org\\.management.* |
| * |
| */ |
| public class ClasspathFunctionResolver extends BaseFunctionResolver { |
| public enum Config { |
| /** |
| * The set of paths. These paths are comma separated URLs with optional regex patterns at the end. |
| * e.g. hdfs://node1:8020/apps/metron/stellar/.*.jar,hdfs://node1:8020/apps/metron/my_org/.*.jar |
| * would signify all the jars under /apps/metron/stellar and /apps/metron/my_org in HDFS. |
| */ |
| STELLAR_VFS_PATHS("stellar.function.paths", ""), |
| /** |
| * The key for a global property that defines one or more regular expressions |
| * that specify what should be included when searching for Stellar functions. |
| */ |
| STELLAR_SEARCH_INCLUDES_KEY("stellar.function.resolver.includes", ""), |
| /** |
| * The key for a global property that defines one or more regular expressions |
| * that specify what should be excluded when searching for Stellar functions. |
| */ |
| STELLAR_SEARCH_EXCLUDES_KEY("stellar.function.resolver.excludes", ""), |
| |
| |
| ; |
| String param; |
| Object defaultValue; |
| Config(String param, String defaultValue) { |
| this.param = param; |
| this.defaultValue = defaultValue; |
| } |
| |
| public String param() { |
| return param; |
| } |
| |
| public Object get(Map<String, Object> config) { |
| return config.getOrDefault(param, defaultValue); |
| } |
| |
| public <T> T get(Map<String, Object> config, Class<T> clazz) { |
| return ConversionUtils.convert(get(config), clazz); |
| } |
| } |
| |
| |
| /** |
| * The includes and excludes can include a list of multiple includes or excludes that |
| * are delimited by these values. |
| */ |
| private static final String STELLAR_SEARCH_DELIMS = "[,:]"; |
| |
| |
| /** |
| * Regular expressions defining packages that should be included in the Stellar function resolution |
| * process. |
| */ |
| private List<String> includes; |
| |
| /** |
| * Regular expressions defining packages that should be excluded from the Stellar function resolution |
| * process. |
| */ |
| private List<String> excludes; |
| |
| /** |
| * Classloaders to try to load from |
| */ |
| private List<ClassLoader> classLoaders; |
| |
| public ClasspathFunctionResolver() { |
| this.includes = new ArrayList<>(); |
| this.excludes = new ArrayList<>(); |
| this.classLoaders = new ArrayList<>(); |
| } |
| |
| /** |
| * Use one or more classloaders |
| * @param classloaders |
| */ |
| public void classLoaders(ClassLoader... classloaders) { |
| classLoaders.clear(); |
| Arrays.stream(classloaders).forEach(c -> classLoaders.add(c)); |
| } |
| |
| /** |
| * Includes one or more packages in the Stellar function resolution process. The packages |
| * to include can be specified with a regular expression. |
| * @param toInclude The regular expressions. |
| */ |
| public void include(String... toInclude) { |
| for(String incl : toInclude) { |
| includes.add(incl); |
| } |
| } |
| |
| /** |
| * Excludes one or more packages from the Stellar function resolution process. The packages |
| * to exclude can be specified with a regular expression. |
| * @param toExclude The regular expressions defining packages that should be excluded. |
| */ |
| public void exclude(String... toExclude) { |
| for(String excl : toExclude) { |
| excludes.add(excl); |
| } |
| } |
| |
| @Override |
| public void initialize(Context context) { |
| super.initialize(context); |
| if(context != null) { |
| |
| Optional<Object> optional = context.getCapability(STELLAR_CONFIG, false); |
| if (optional.isPresent()) { |
| Map<String, Object> stellarConfig = (Map<String, Object>) optional.get(); |
| if(LOG.isDebugEnabled()) { |
| LOG.debug("Setting up classloader using the following config: {}", stellarConfig); |
| } |
| |
| include(STELLAR_SEARCH_INCLUDES_KEY.get(stellarConfig, String.class).split(STELLAR_SEARCH_DELIMS)); |
| exclude(STELLAR_SEARCH_EXCLUDES_KEY.get(stellarConfig, String.class).split(STELLAR_SEARCH_DELIMS)); |
| Optional<ClassLoader> vfsLoader = Optional.empty(); |
| try { |
| vfsLoader = VFSClassloaderUtil.configureClassloader(STELLAR_VFS_PATHS.get(stellarConfig, String.class)); |
| if(vfsLoader.isPresent()) { |
| LOG.debug("CLASSLOADER LOADED WITH: {}", STELLAR_VFS_PATHS.get(stellarConfig, String.class)); |
| if(LOG.isDebugEnabled()) { |
| for (FileObject fo : ((VFSClassLoader) vfsLoader.get()).getFileObjects()) { |
| LOG.error("{} - {}", fo.getURL(), fo.exists()); |
| } |
| } |
| classLoaders(vfsLoader.get()); |
| } |
| } catch (FileSystemException e) { |
| LOG.error("Unable to process filesystem: {}", e.getMessage(), e); |
| } |
| } |
| else { |
| LOG.info("No stellar config set; I'm reverting to the context classpath with no restrictions."); |
| if(LOG.isDebugEnabled()) { |
| try { |
| throw new IllegalStateException("No config set, stacktrace follows."); |
| } catch (IllegalStateException ise) { |
| LOG.error(ise.getMessage(), ise); |
| } |
| } |
| } |
| } |
| else { |
| throw new IllegalStateException("CONTEXT IS NULL!"); |
| } |
| } |
| |
| /** |
| * Returns a set of classes that should undergo further interrogation for resolution |
| * (aka discovery) of Stellar functions. |
| */ |
| @Override |
| public Set<Class<? extends StellarFunction>> resolvables() { |
| |
| ClassLoader[] cls = null; |
| if(this.classLoaders.size() == 0) { |
| LOG.warn("Using System classloader"); |
| cls = new ClassLoader[] { getClass().getClassLoader() }; |
| } |
| else { |
| cls = new ClassLoader[this.classLoaders.size()]; |
| for (int i = 0; i < this.classLoaders.size(); ++i) { |
| cls[i] = this.classLoaders.get(i); |
| } |
| } |
| |
| FilterBuilder filterBuilder = new FilterBuilder(); |
| excludes.forEach(excl -> { |
| if(excl != null) { |
| filterBuilder.exclude(excl); |
| } |
| }); |
| includes.forEach(incl -> { |
| if(incl != null) { |
| filterBuilder.include(incl); |
| } |
| }); |
| Set<String> classes = new HashSet<>(); |
| Set<Class<? extends StellarFunction>> ret = new HashSet<>(); |
| for(ClassLoader cl : cls) { |
| for(Class<?> c : ClassIndex.getAnnotated(Stellar.class, cl)) { |
| if(StellarFunction.class.isAssignableFrom(c) && filterBuilder.apply(c.getCanonicalName())) { |
| String className = c.getName(); |
| if(!classes.contains(className)) { |
| ret.add((Class<? extends StellarFunction>) c); |
| classes.add(className); |
| } |
| } |
| } |
| } |
| return ret; |
| } |
| |
| } |