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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.exec;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import com.google.common.io.BaseEncoding;
import com.google.devtools.build.lib.actions.ActionInput;
import com.google.devtools.build.lib.actions.ActionInputHelper;
import com.google.devtools.build.lib.actions.DigestOfDirectoryException;
import com.google.devtools.build.lib.testutil.Suite;
import com.google.devtools.build.lib.testutil.TestSpec;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import com.google.protobuf.ByteString;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests SingleBuildFileCache. */
@RunWith(JUnit4.class)
@TestSpec(size = Suite.SMALL_TESTS)
public class SingleBuildFileCacheTest {
private static final String EMPTY_MD5 = "d41d8cd98f00b204e9800998ecf8427e";
private FileSystem fs;
private Map<String, Integer> calls;
private Map<String, byte[]> md5Overrides;
private SingleBuildFileCache underTest;
@Before
public final void setUp() throws Exception {
calls = new HashMap<>();
md5Overrides = new HashMap<>();
fs = new InMemoryFileSystem() {
@Override
protected InputStream getInputStream(Path path) throws IOException {
int c = calls.containsKey(path.toString())
? calls.get(path.toString()) : 0;
c++;
calls.put(path.toString(), c);
return super.getInputStream(path);
}
@Override
protected byte[] getDigest(Path path, HashFunction hf) throws IOException {
assertThat(hf).isEqualTo(HashFunction.MD5);
byte[] override = md5Overrides.get(path.getPathString());
return override != null ? override : super.getDigest(path, hf);
}
};
underTest = new SingleBuildFileCache("/", fs);
Path root = fs.getRootDirectory();
Path file = root.getChild("empty");
file.getOutputStream().close();
}
@Test
public void testNonExistentPath() throws Exception {
ActionInput empty = ActionInputHelper.fromPath("/noexist");
try {
underTest.getMetadata(empty);
fail("non existent file should raise exception");
} catch (IOException expected) {
}
}
@Test
public void testDirectory() throws Exception {
Path file = fs.getPath("/directory");
file.createDirectory();
ActionInput input = ActionInputHelper.fromPath(file.getPathString());
try {
underTest.getMetadata(input);
fail("directory should raise exception");
} catch (DigestOfDirectoryException expected) {
assertThat(expected).hasMessageThat().isEqualTo("Input is a directory: /directory");
}
}
@Test
public void testCache() throws Exception {
ActionInput empty = ActionInputHelper.fromPath("/empty");
underTest.getMetadata(empty).getDigest();
assert(calls.containsKey("/empty"));
assertThat((int) calls.get("/empty")).isEqualTo(1);
underTest.getMetadata(empty).getDigest();
assertThat((int) calls.get("/empty")).isEqualTo(1);
}
@Test
public void testBasic() throws Exception {
ActionInput empty = ActionInputHelper.fromPath("/empty");
assertThat(underTest.getMetadata(empty).getSize()).isEqualTo(0);
byte[] digestBytes = underTest.getMetadata(empty).getDigest();
ByteString digest = ByteString.copyFromUtf8(
BaseEncoding.base16().lowerCase().encode(digestBytes));
assertThat(digest.toStringUtf8()).isEqualTo(EMPTY_MD5);
assertThat(underTest.getInputFromDigest(digest).getExecPathString()).isEqualTo("/empty");
assert(underTest.contentsAvailableLocally(digest));
ByteString other = ByteString.copyFrom("f41d8cd98f00b204e9800998ecf8427e", "UTF-16");
assert(!underTest.contentsAvailableLocally(other));
assert(calls.containsKey("/empty"));
}
@Test
public void testUnreadableFileWhenFileSystemSupportsDigest() throws Exception {
byte[] expectedDigestRaw = MessageDigest.getInstance("md5").digest(
"randomtext".getBytes(StandardCharsets.UTF_8));
ByteString expectedDigest = ByteString.copyFrom(expectedDigestRaw);
md5Overrides.put("/unreadable", expectedDigestRaw);
ActionInput input = ActionInputHelper.fromPath("/unreadable");
Path file = fs.getPath("/unreadable");
file.getOutputStream().close();
file.chmod(0);
ByteString actualDigest = ByteString.copyFrom(underTest.getMetadata(input).getDigest());
assertThat(expectedDigest).isEqualTo(actualDigest);
}
}
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