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// Copyright 2015 The Bazel Authors. 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.
package com.google.devtools.build.lib.remote;
import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.fail;
import com.google.devtools.build.lib.remote.Chunker.Chunk;
import com.google.devtools.build.lib.remote.util.DigestUtil;
import com.google.devtools.build.lib.vfs.DigestHashFunction;
import com.google.devtools.remoteexecution.v1test.Digest;
import com.google.protobuf.ByteString;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;
import java.util.Random;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mockito;
/** Tests for {@link Chunker}. */
@RunWith(JUnit4.class)
public class ChunkerTest {
private final DigestUtil digestUtil = new DigestUtil(DigestHashFunction.SHA256);
@Test
public void chunkingShouldWork() throws IOException {
Random rand = new Random();
byte[] expectedData = new byte[21];
rand.nextBytes(expectedData);
Digest expectedDigest = digestUtil.compute(expectedData);
Chunker chunker = Chunker.builder(digestUtil).setInput(expectedData).setChunkSize(10).build();
ByteArrayOutputStream actualData = new ByteArrayOutputStream();
assertThat(chunker.hasNext()).isTrue();
Chunk next = chunker.next();
assertThat(next.getOffset()).isEqualTo(0);
assertThat(next.getData()).hasSize(10);
assertThat(next.getDigest()).isEqualTo(expectedDigest);
next.getData().writeTo(actualData);
assertThat(chunker.hasNext()).isTrue();
next = chunker.next();
assertThat(next.getOffset()).isEqualTo(10);
assertThat(next.getData()).hasSize(10);
assertThat(next.getDigest()).isEqualTo(expectedDigest);
next.getData().writeTo(actualData);
assertThat(chunker.hasNext()).isTrue();
next = chunker.next();
assertThat(next.getOffset()).isEqualTo(20);
assertThat(next.getData()).hasSize(1);
assertThat(next.getDigest()).isEqualTo(expectedDigest);
next.getData().writeTo(actualData);
assertThat(chunker.hasNext()).isFalse();
assertThat(actualData.toByteArray()).isEqualTo(expectedData);
}
@Test
public void nextShouldThrowIfNoMoreData() throws IOException {
byte[] data = new byte[10];
Chunker chunker = Chunker.builder(digestUtil).setInput(data).setChunkSize(10).build();
assertThat(chunker.hasNext()).isTrue();
assertThat(chunker.next()).isNotNull();
assertThat(chunker.hasNext()).isFalse();
try {
chunker.next();
fail("Should have thrown an exception");
} catch (NoSuchElementException expected) {
// Intentionally left empty.
}
}
@Test
public void emptyData() throws Exception {
byte[] data = new byte[0];
Chunker chunker = Chunker.builder(digestUtil).setInput(data).build();
assertThat(chunker.hasNext()).isTrue();
Chunk next = chunker.next();
assertThat(next).isNotNull();
assertThat(next.getData()).isEmpty();
assertThat(next.getOffset()).isEqualTo(0);
assertThat(chunker.hasNext()).isFalse();
try {
chunker.next();
fail("Should have thrown an exception");
} catch (NoSuchElementException expected) {
// Intentionally left empty.
}
}
@Test
public void reset() throws Exception {
byte[] data = new byte[]{1, 2, 3};
Chunker chunker = Chunker.builder(digestUtil).setInput(data).setChunkSize(1).build();
assertNextEquals(chunker, (byte) 1);
assertNextEquals(chunker, (byte) 2);
chunker.reset();
assertNextEquals(chunker, (byte) 1);
assertNextEquals(chunker, (byte) 2);
assertNextEquals(chunker, (byte) 3);
chunker.reset();
assertNextEquals(chunker, (byte) 1);
}
@Test
public void resourcesShouldBeReleased() throws IOException {
// Test that after having consumed all data or after reset() is called (whatever happens first)
// the underlying InputStream should be closed.
byte[] data = new byte[] {1, 2};
final AtomicReference<InputStream> in = new AtomicReference<>();
Supplier<InputStream> supplier = () -> {
in.set(Mockito.spy(new ByteArrayInputStream(data)));
return in.get();
};
Digest digest = digestUtil.compute(data);
Chunker chunker = new Chunker(supplier, digest, 1, digestUtil);
assertThat(in.get()).isNull();
assertNextEquals(chunker, (byte) 1);
Mockito.verify(in.get(), Mockito.never()).close();
assertNextEquals(chunker, (byte) 2);
Mockito.verify(in.get()).close();
chunker.reset();
chunker.next();
chunker.reset();
Mockito.verify(in.get()).close();
}
private void assertNextEquals(Chunker chunker, byte... data) throws IOException {
assertThat(chunker.hasNext()).isTrue();
ByteString next = chunker.next().getData();
assertThat(next.toByteArray()).isEqualTo(data);
}
}
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