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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.assertThrows;
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.vfs.DigestHashFunction;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
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)
public class SingleBuildFileCacheTest {
private FileSystem fs;
private Map<String, Integer> calls;
private Map<String, byte[]> digestOverrides;
private SingleBuildFileCache underTest;
@Before
public final void setUp() throws Exception {
calls = new HashMap<>();
digestOverrides = new HashMap<>();
fs =
new InMemoryFileSystem(DigestHashFunction.SHA256) {
@Override
protected InputStream getInputStream(PathFragment 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(PathFragment path) throws IOException {
byte[] override = digestOverrides.get(path.getPathString());
return override != null ? override : super.getDigest(path);
}
@Override
protected byte[] getFastDigest(PathFragment path) throws IOException {
return null;
}
};
underTest = new SingleBuildFileCache("/", fs);
FileSystemUtils.createEmptyFile(fs.getPath("/empty"));
}
@Test
public void testNonExistentPath() throws Exception {
ActionInput empty = ActionInputHelper.fromPath("/noexist");
assertThrows(
"non existent file should raise exception",
IOException.class,
() -> underTest.getMetadata(empty));
}
@Test
public void testDirectory() throws Exception {
Path file = fs.getPath("/directory");
file.createDirectory();
ActionInput input = ActionInputHelper.fromPath(file.getPathString());
DigestOfDirectoryException expected =
assertThrows(
"directory should raise exception",
DigestOfDirectoryException.class,
() -> underTest.getMetadata(input));
assertThat(expected).hasMessageThat().isEqualTo("Input is a directory: /directory");
}
@Test
public void testCache() throws Exception {
ActionInput empty = ActionInputHelper.fromPath("/empty");
underTest.getMetadata(empty).getDigest();
assertThat(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[] digest = underTest.getMetadata(empty).getDigest();
byte[] expected = fs.getDigestFunction().getHashFunction().hashBytes(new byte[0]).asBytes();
assertThat(digest).isEqualTo(expected);
}
@Test
public void testUnreadableFileWhenFileSystemSupportsDigest() throws Exception {
byte[] expectedDigest = "expected".getBytes(StandardCharsets.UTF_8);
digestOverrides.put("/unreadable", expectedDigest);
ActionInput input = ActionInputHelper.fromPath("/unreadable");
Path file = fs.getPath("/unreadable");
FileSystemUtils.createEmptyFile(file);
file.chmod(0);
byte[] actualDigest = underTest.getMetadata(input).getDigest();
assertThat(actualDigest).isEqualTo(expectedDigest);
}
}