/*
* 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.runtime.blob;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetSocketAddress;
import java.security.MessageDigest;
import org.apache.flink.runtime.jobgraph.JobID;
import org.apache.flink.util.StringUtils;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
/**
* This class contains unit tests for the {@link BlobClient}.
*/
public class BlobClientTest {
/**
* The buffer size used during the tests in bytes.
*/
private static final int TEST_BUFFER_SIZE = 17 * 1000;
/**
* The instance of the BLOB server used during the tests.
*/
private static BlobServer BLOB_SERVER;
/**
* Starts the BLOB server.
*/
@BeforeClass
public static void startServer() {
try {
BLOB_SERVER = new BlobServer();
} catch (IOException ioe) {
fail(StringUtils.stringifyException(ioe));
}
}
/**
* Shuts the BLOB server down.
*/
@AfterClass
public static void stopServer() {
if (BLOB_SERVER != null) {
try {
BLOB_SERVER.shutdown();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* Creates a test buffer and fills it with a specific byte pattern.
*
* @return a test buffer filled with a specific byte pattern
*/
private static byte[] createTestBuffer() {
final byte[] buf = new byte[TEST_BUFFER_SIZE];
for (int i = 0; i < buf.length; ++i) {
buf[i] = (byte) (i % 128);
}
return buf;
}
/**
* Prepares a test file for the unit tests, i.e. the methods fills the file with a particular byte patterns and
* computes the file's BLOB key.
*
* @param file
* the file to prepare for the unit tests
* @return the BLOB key of the prepared file
* @throws IOException
* thrown if an I/O error occurs while writing to the test file
*/
private static BlobKey prepareTestFile(final File file) throws IOException {
MessageDigest md = BlobUtils.createMessageDigest();
final byte[] buf = new byte[TEST_BUFFER_SIZE];
for (int i = 0; i < buf.length; ++i) {
buf[i] = (byte) (i % 128);
}
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
for (int i = 0; i < 20; ++i) {
fos.write(buf);
md.update(buf);
}
} finally {
if (fos != null) {
fos.close();
}
}
return new BlobKey(md.digest());
}
/**
* Validates the result of a GET operation by comparing the data from the retrieved input stream to the content of
* the specified buffer.
*
* @param inputStream
* the input stream returned from the GET operation
* @param buf
* the buffer to compare the input stream's data to
* @throws IOException
* thrown if an I/O error occurs while reading the input stream
*/
private static void validateGet(final InputStream inputStream, final byte[] buf) throws IOException {
int bytesReceived = 0;
while (true) {
final int read = inputStream.read(buf, bytesReceived, buf.length - bytesReceived);
if (read < 0) {
throw new EOFException();
}
bytesReceived += read;
if (bytesReceived == buf.length) {
assertEquals(-1, inputStream.read());
return;
}
}
}
/**
* Validates the result of a GET operation by comparing the data from the retrieved input stream to the content of
* the specified file.
*
* @param inputStream
* the input stream returned from the GET operation
* @param file
* the file to compare the input stream's data to
* @throws IOException
* thrown if an I/O error occurs while reading the input stream or the file
*/
private static void validateGet(final InputStream inputStream, final File file) throws IOException {
InputStream inputStream2 = null;
try {
inputStream2 = new FileInputStream(file);
while (true) {
final int r1 = inputStream.read();
final int r2 = inputStream2.read();
assertEquals(r2, r1);
if (r1 < 0) {
break;
}
}
} finally {
if (inputStream2 != null) {
inputStream2.close();
}
}
}
/**
* Tests the PUT/GET operations for content-addressable buffers.
*/
@Test
public void testContentAddressableBuffer() {
final byte[] testBuffer = createTestBuffer();
final MessageDigest md = BlobUtils.createMessageDigest();
md.update(testBuffer);
final BlobKey origKey = new BlobKey(md.digest());
try {
BlobClient client = null;
try {
final InetSocketAddress serverAddress = new InetSocketAddress("localhost", BLOB_SERVER.getServerPort());
client = new BlobClient(serverAddress);
// Store the data
final BlobKey receivedKey = client.put(testBuffer);
assertEquals(origKey, receivedKey);
// Retrieve the data
final InputStream is = client.get(receivedKey);
validateGet(is, testBuffer);
// Check reaction to invalid keys
try {
client.get(new BlobKey());
} catch (FileNotFoundException fnfe) {
return;
}
fail("Expected FileNotFoundException did not occur");
} finally {
if (client != null) {
client.close();
}
}
} catch (IOException ioe) {
fail(StringUtils.stringifyException(ioe));
}
}
/**
* Tests the PUT/GET operations for content-addressable streams.
*/
@Test
public void testContentAddressableStream() {
try {
final File testFile = File.createTempFile("testfile", ".dat");
testFile.deleteOnExit();
final BlobKey origKey = prepareTestFile(testFile);
BlobClient client = null;
InputStream is = null;
try {
final InetSocketAddress serverAddress = new InetSocketAddress("localhost", BLOB_SERVER.getServerPort());
client = new BlobClient(serverAddress);
// Store the data
is = new FileInputStream(testFile);
final BlobKey receivedKey = client.put(is);
assertEquals(origKey, receivedKey);
is.close();
is = null;
// Retrieve the data
is = client.get(receivedKey);
validateGet(is, testFile);
} finally {
if (is != null) {
is.close();
}
if (client != null) {
client.close();
}
}
} catch (IOException ioe) {
fail(StringUtils.stringifyException(ioe));
}
}
/**
* Tests the PUT/GET operations for regular (non-content-addressable) buffers.
*/
@Test
public void testRegularBuffer() {
final byte[] testBuffer = createTestBuffer();
final JobID jobID = JobID.generate();
final String key = "testkey";
try {
BlobClient client = null;
try {
final InetSocketAddress serverAddress = new InetSocketAddress("localhost", BLOB_SERVER.getServerPort());
client = new BlobClient(serverAddress);
// Store the data
client.put(jobID, key, testBuffer);
// Retrieve the data
final InputStream is = client.get(jobID, key);
validateGet(is, testBuffer);
// Delete the data
client.delete(jobID, key);
// Check if the BLOB is still available
try {
client.get(jobID, key);
} catch (FileNotFoundException fnfe) {
return;
}
fail("Expected FileNotFoundException did not occur");
} finally {
if (client != null) {
client.close();
}
}
} catch (IOException ioe) {
fail(StringUtils.stringifyException(ioe));
}
}
/**
* Tests the PUT/GET operations for regular (non-content-addressable) streams.
*/
@Test
public void testRegularStream() {
final JobID jobID = JobID.generate();
final String key = "testkey3";
try {
final File testFile = File.createTempFile("testfile", ".dat");
testFile.deleteOnExit();
prepareTestFile(testFile);
BlobClient client = null;
InputStream is = null;
try {
final InetSocketAddress serverAddress = new InetSocketAddress("localhost", BLOB_SERVER.getServerPort());
client = new BlobClient(serverAddress);
// Store the data
is = new FileInputStream(testFile);
client.put(jobID, key, is);
is.close();
is = null;
// Retrieve the data
is = client.get(jobID, key);
validateGet(is, testFile);
} finally {
if (is != null) {
is.close();
}
if (client != null) {
client.close();
}
}
} catch (IOException ioe) {
fail(StringUtils.stringifyException(ioe));
}
}
}