/*

* SPDX-License-Identifier: Apache-2.0

* Copyright 2018-2019 The Feast Authors

*

* 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

*

* https://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 feast.core.util;

import static feast.core.util.PackageUtil.resolveSpringBootPackageClasspath;

import java.io.File;

import java.io.IOException;

import java.net.URISyntaxException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

public class PipelineUtil {

/**

* Attempts to detect all the resources the class loader has access to. This does not recurse to

* class loader parents stopping it from pulling in resources from the system class loader.

*

* <p>This method extends this implemention

* https://github.com/apache/beam/blob/01726e9c62313749f9ea7c93063a1178abd1a8db/runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/PipelineResources.java#L51

* to support URL that starts with "jar:file:", usually coming from a packaged Spring Boot jar.

*

* @param classLoader The URLClassLoader to use to detect resources to stage.

* @return A list of absolute paths to the resources the class loader uses.

* @throws IllegalArgumentException If either the class loader is not a URLClassLoader or one of

* the resources the class loader exposes is not a file resource.

* @throws IOException If there is an error in reading or writing files.

*/

public static List<String> detectClassPathResourcesToStage(ClassLoader classLoader)

throws IOException {

if (!(classLoader instanceof URLClassLoader)) {

return getClasspathFiles();

}

List<String> files = new ArrayList<>();

for (URL url : ((URLClassLoader) classLoader).getURLs()) {

if (url.toString().startsWith("jar:file:")) {

files.add(resolveSpringBootPackageClasspath(url));

continue;

}

try {

files.add(new File(url.toURI()).getAbsolutePath());

} catch (IllegalArgumentException | URISyntaxException e) {

String message = String.format("Unable to convert url (%s) to file.", url);

throw new IllegalArgumentException(message, e);

}

}

return files;

}

private static List<String> getClasspathFiles() {

return Arrays.stream(System.getProperty("java.class.path").split(File.pathSeparator))

.map(entry -> new File(entry).getPath())

.collect(Collectors.toList());

}

}