flink-libraries/flink-streaming-python/src/test/java/org/apache/flink/streaming/python/api/PythonStreamBinderTest.java

/*
 * 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.flink.streaming.python.api;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.FileStatus;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.Path;
import org.apache.flink.core.fs.local.LocalFileSystem;
import org.apache.flink.runtime.client.JobExecutionException;
import org.apache.flink.streaming.util.StreamingProgramTestBase;
import org.apache.flink.util.Preconditions;

import org.python.core.PyException;

import java.util.ArrayList;
import java.util.List;

/**
 * Tests for the {@link PythonStreamBinder}.
 */
public class PythonStreamBinderTest extends StreamingProgramTestBase {

	private static Path getBaseTestPythonDir() {
		FileSystem fs = new LocalFileSystem();
		return new Path(fs.getWorkingDirectory(), "src/test/python/org/apache/flink/streaming/python/api");
	}

	private static Path findUtilsModule() {
		return new Path(getBaseTestPythonDir(), "utils");
	}

	private static List<String> findTestFiles() throws Exception {
		List<String> files = new ArrayList<>();
		FileSystem fs = FileSystem.getLocalFileSystem();
		FileStatus[] status = fs.listStatus(getBaseTestPythonDir());
		for (FileStatus f : status) {
			Path filePath = f.getPath();
			String fileName = filePath.getName();
			if (fileName.startsWith("test_") && fileName.endsWith(".py")) {
				files.add(filePath.getPath());
			}
		}
		return files;
	}

	@Override
	public void testProgram() throws Exception {
		Path testEntryPoint = new Path(getBaseTestPythonDir(), "examples/word_count.py");
		List<String> testFiles = findTestFiles();

		Preconditions.checkState(testFiles.size() > 0, "No test files were found in {}.", getBaseTestPythonDir());

		String[] arguments = new String[1 + 1 + testFiles.size()];
		arguments[0] = testEntryPoint.getPath();
		arguments[1] = findUtilsModule().getPath();
		int index = 2;
		for (String testFile : testFiles) {
			arguments[index] = testFile;
			index++;
		}
		try {
			new PythonStreamBinder(new Configuration())
				.runPlan(arguments);
		} catch (PyException e) {
			if (e.getCause() instanceof JobExecutionException) {
				// JobExecutionExceptions are wrapped again by the jython interpreter resulting in horrible stacktraces
				throw (JobExecutionException) e.getCause();
			} else {
				// probably caused by some issue in the main script itself
				throw e;
			}
		}
	}
}