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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.apache.nifi.nar;
import org.apache.nifi.bundle.Bundle;
import org.apache.nifi.bundle.BundleCoordinate;
import org.apache.nifi.bundle.BundleDetails;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.jar.Manifest;
import java.util.stream.Collectors;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.jar.Attributes;
/**
* Class responsible for loading JARs for DCAEProcessors into Nifi
*/
public class DCAEClassLoaders {
public static class DCAEClassLoadersError extends RuntimeException {
public DCAEClassLoadersError(Throwable e) {
super("Error while using DCAEClassLoaders", e);
}
}
/**
* Given a URL to a index.json file, fetches the file and generates a list of
* URLs for DCAE jars that has Processors packaged.
*
* @param indexDCAEJars
* @return
*/
public static List<URL> getDCAEJarsURLs(URI indexDCAEJars) {
JsonFactory jf = new JsonFactory();
ObjectMapper om = new ObjectMapper();
try {
List<Object> urls = om.readValue(jf.createParser(indexDCAEJars.toURL()), List.class);
return urls.stream().map(u -> {
try {
Map<String, Object> foo = (Map<String, Object>) u;
String name = (String) foo.get("name");
String url = String.format("%s/%s", indexDCAEJars.toString(), name);
return new URL(url);
} catch (MalformedURLException e) {
// Hopefully you never come here...
return null;
}
}).collect(Collectors.toList());
} catch (Exception e) {
throw new RuntimeException("Error while getting jar URIs", e);
}
}
private static BundleDetails createBundleDetails(URLClassLoader classLoader) {
try {
URL url = classLoader.findResource("META-INF/MANIFEST.MF");
Manifest manifest = new Manifest(url.openStream());
final Attributes attributes = manifest.getMainAttributes();
final BundleDetails.Builder builder = new BundleDetails.Builder();
// NOTE: Working directory cannot be null so set it to some bogus dir
// because we aren't really using this. Or maybe should create our own
// working directory
builder.workingDir(new File("/tmp"));
final String group = attributes.getValue("Group");
final String id = attributes.getValue("Id");
final String version = attributes.getValue("Version");
builder.coordinate(new BundleCoordinate(group, id, version));
return builder.build();
} catch (IOException e) {
throw new DCAEClassLoadersError(e);
}
}
/**
* From a list of URLs to remote JARs where the JARs contain DCAEProcessor classes,
* create a bundle for each JAR. You will never get a partial list of bundles.
*
* @param jarURLs
* @return
*/
public static Set<Bundle> createDCAEBundles(List<URL> jarURLs) {
Set<Bundle> bundles = new HashSet<>();
for (URL jarURL : jarURLs) {
URLClassLoader classLoader = new URLClassLoader(new URL[] {jarURL});
Bundle bundle = new Bundle(createBundleDetails(classLoader), classLoader);
bundles.add(bundle);
}
return bundles;
}
}
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