org.junit.jupiter.engine.extension.TempDirectory Maven / Gradle / Ivy
Show all versions of junit-jupiter-engine Show documentation
/*
* Copyright 2015-2022 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* https://www.eclipse.org/legal/epl-v20.html
*/
package org.junit.jupiter.engine.extension;
import static java.nio.file.FileVisitResult.CONTINUE;
import static java.util.stream.Collectors.joining;
import static org.junit.jupiter.api.io.CleanupMode.DEFAULT;
import static org.junit.jupiter.api.io.CleanupMode.NEVER;
import static org.junit.jupiter.api.io.CleanupMode.ON_SUCCESS;
import static org.junit.platform.commons.util.AnnotationUtils.findAnnotatedFields;
import static org.junit.platform.commons.util.AnnotationUtils.findAnnotation;
import static org.junit.platform.commons.util.ReflectionUtils.makeAccessible;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Parameter;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.function.Predicate;
import org.junit.jupiter.api.extension.BeforeAllCallback;
import org.junit.jupiter.api.extension.BeforeEachCallback;
import org.junit.jupiter.api.extension.ExtensionConfigurationException;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
import org.junit.jupiter.api.extension.ExtensionContext.Store.CloseableResource;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;
import org.junit.jupiter.api.io.CleanupMode;
import org.junit.jupiter.api.io.TempDir;
import org.junit.jupiter.engine.config.EnumConfigurationParameterConverter;
import org.junit.jupiter.engine.config.JupiterConfiguration;
import org.junit.platform.commons.JUnitException;
import org.junit.platform.commons.logging.Logger;
import org.junit.platform.commons.logging.LoggerFactory;
import org.junit.platform.commons.util.ExceptionUtils;
import org.junit.platform.commons.util.ReflectionUtils;
/**
* {@code TempDirectory} is a JUnit Jupiter extension that creates and cleans
* up temporary directories if field in a test class or a parameter in a
* lifecycle method or test method is annotated with {@code @TempDir}.
*
* Consult the Javadoc for {@link TempDir} for details on the contract.
*
* @since 5.4
* @see TempDir
* @see Files#createTempDirectory
*/
class TempDirectory implements BeforeAllCallback, BeforeEachCallback, ParameterResolver {
static final Namespace NAMESPACE = Namespace.create(TempDirectory.class);
private static final String KEY = "temp.dir";
private static final String TEMP_DIR_PREFIX = "junit";
// for testing purposes
static final String FILE_OPERATIONS_KEY = "file.operations";
private final JupiterConfiguration configuration;
public TempDirectory(JupiterConfiguration configuration) {
this.configuration = configuration;
}
/**
* Perform field injection for non-private, {@code static} fields (i.e.,
* class fields) of type {@link Path} or {@link File} that are annotated with
* {@link TempDir @TempDir}.
*/
@Override
public void beforeAll(ExtensionContext context) {
injectStaticFields(context, context.getRequiredTestClass());
}
/**
* Perform field injection for non-private, non-static fields (i.e.,
* instance fields) of type {@link Path} or {@link File} that are annotated
* with {@link TempDir @TempDir}.
*/
@Override
public void beforeEach(ExtensionContext context) {
context.getRequiredTestInstances().getAllInstances() //
.forEach(instance -> injectInstanceFields(context, instance));
}
private void injectStaticFields(ExtensionContext context, Class testClass) {
injectFields(context, null, testClass, ReflectionUtils::isStatic);
}
private void injectInstanceFields(ExtensionContext context, Object instance) {
injectFields(context, instance, instance.getClass(), ReflectionUtils::isNotStatic);
}
private void injectFields(ExtensionContext context, Object testInstance, Class testClass,
Predicate predicate) {
findAnnotatedFields(testClass, TempDir.class, predicate).forEach(field -> {
assertNonFinalField(field);
assertSupportedType("field", field.getType());
try {
CleanupMode cleanupMode = determineCleanupModeForField(field);
makeAccessible(field).set(testInstance, getPathOrFile(field, field.getType(), cleanupMode, context));
}
catch (Throwable t) {
ExceptionUtils.throwAsUncheckedException(t);
}
});
}
/**
* Determine if the {@link Parameter} in the supplied {@link ParameterContext}
* is annotated with {@link TempDir @TempDir}.
*/
@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
boolean annotated = parameterContext.isAnnotated(TempDir.class);
if (annotated && parameterContext.getDeclaringExecutable() instanceof Constructor) {
throw new ParameterResolutionException(
"@TempDir is not supported on constructor parameters. Please use field injection instead.");
}
return annotated;
}
/**
* Resolve the current temporary directory for the {@link Parameter} in the
* supplied {@link ParameterContext}.
*/
@Override
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
Class parameterType = parameterContext.getParameter().getType();
assertSupportedType("parameter", parameterType);
CleanupMode cleanupMode = determineCleanupModeForParameter(parameterContext);
return getPathOrFile(parameterContext.getParameter(), parameterType, cleanupMode, extensionContext);
}
private CleanupMode determineCleanupModeForField(Field field) {
TempDir tempDir = findAnnotation(field, TempDir.class).orElseThrow(
() -> new JUnitException("Field " + field + " must be annotated with @TempDir"));
return determineCleanupMode(tempDir);
}
private CleanupMode determineCleanupModeForParameter(ParameterContext parameterContext) {
TempDir tempDir = parameterContext.findAnnotation(TempDir.class).orElseThrow(() -> new JUnitException(
"Parameter " + parameterContext.getParameter() + " must be annotated with @TempDir"));
return determineCleanupMode(tempDir);
}
private CleanupMode determineCleanupMode(TempDir tempDir) {
CleanupMode cleanupMode = tempDir.cleanup();
return cleanupMode == DEFAULT ? this.configuration.getDefaultTempDirCleanupMode() : cleanupMode;
}
private void assertNonFinalField(Field field) {
if (ReflectionUtils.isFinal(field)) {
throw new ExtensionConfigurationException("@TempDir field [" + field + "] must not be declared as final.");
}
}
private void assertSupportedType(String target, Class type) {
if (type != Path.class && type != File.class) {
throw new ExtensionConfigurationException("Can only resolve @TempDir " + target + " of type "
+ Path.class.getName() + " or " + File.class.getName() + " but was: " + type.getName());
}
}
private Object getPathOrFile(AnnotatedElement sourceElement, Class type, CleanupMode cleanupMode,
ExtensionContext extensionContext) {
Namespace namespace = getScope(extensionContext) == Scope.PER_DECLARATION //
? NAMESPACE.append(sourceElement) //
: NAMESPACE;
Path path = extensionContext.getStore(namespace) //
.getOrComputeIfAbsent(KEY, __ -> createTempDir(cleanupMode, extensionContext), CloseablePath.class) //
.get();
return (type == Path.class) ? path : path.toFile();
}
@SuppressWarnings("deprecation")
private Scope getScope(ExtensionContext context) {
return context.getRoot().getStore(NAMESPACE).getOrComputeIfAbsent( //
Scope.class, //
__ -> new EnumConfigurationParameterConverter<>(Scope.class, "@TempDir scope") //
.get(TempDir.SCOPE_PROPERTY_NAME, context::getConfigurationParameter, Scope.PER_DECLARATION), //
Scope.class //
);
}
static CloseablePath createTempDir(CleanupMode cleanupMode, ExtensionContext executionContext) {
try {
return new CloseablePath(Files.createTempDirectory(TEMP_DIR_PREFIX), cleanupMode, executionContext);
}
catch (Exception ex) {
throw new ExtensionConfigurationException("Failed to create default temp directory", ex);
}
}
static class CloseablePath implements CloseableResource {
private static final Logger logger = LoggerFactory.getLogger(CloseablePath.class);
private final Path dir;
private final CleanupMode cleanupMode;
private final ExtensionContext executionContext;
CloseablePath(Path dir, CleanupMode cleanupMode, ExtensionContext executionContext) {
this.dir = dir;
this.cleanupMode = cleanupMode;
this.executionContext = executionContext;
}
Path get() {
return dir;
}
@Override
public void close() throws IOException {
if (cleanupMode == NEVER
|| (cleanupMode == ON_SUCCESS && executionContext.getExecutionException().isPresent())) {
logger.info(() -> "Skipping cleanup of temp dir " + dir + " due to cleanup mode configuration.");
return;
}
FileOperations fileOperations = executionContext.getStore(NAMESPACE) //
.getOrDefault(FILE_OPERATIONS_KEY, FileOperations.class, FileOperations.DEFAULT);
SortedMap failures = deleteAllFilesAndDirectories(fileOperations);
if (!failures.isEmpty()) {
throw createIOExceptionWithAttachedFailures(failures);
}
}
private SortedMap deleteAllFilesAndDirectories(FileOperations fileOperations)
throws IOException {
if (Files.notExists(dir)) {
return Collections.emptySortedMap();
}
SortedMap failures = new TreeMap<>();
Set retriedPaths = new HashSet<>();
resetPermissions(dir);
Files.walkFileTree(dir, new SimpleFileVisitor() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
if (!dir.equals(CloseablePath.this.dir)) {
resetPermissions(dir);
}
return CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc) {
// IOException includes `AccessDeniedException` thrown by non-readable or non-executable flags
resetPermissionsAndTryToDeleteAgain(file, exc);
return CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) {
return deleteAndContinue(file);
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
return deleteAndContinue(dir);
}
private FileVisitResult deleteAndContinue(Path path) {
try {
fileOperations.delete(path);
}
catch (NoSuchFileException ignore) {
// ignore
}
catch (DirectoryNotEmptyException exception) {
failures.put(path, exception);
}
catch (IOException exception) {
// IOException includes `AccessDeniedException` thrown by non-readable or non-executable flags
resetPermissionsAndTryToDeleteAgain(path, exception);
}
return CONTINUE;
}
private void resetPermissionsAndTryToDeleteAgain(Path path, IOException exception) {
boolean notYetRetried = retriedPaths.add(path);
if (notYetRetried) {
try {
resetPermissions(path);
if (Files.isDirectory(path)) {
Files.walkFileTree(path, this);
}
else {
fileOperations.delete(path);
}
}
catch (Exception suppressed) {
exception.addSuppressed(suppressed);
}
}
else {
failures.put(path, exception);
}
}
});
return failures;
}
@SuppressWarnings("ResultOfMethodCallIgnored")
private static void resetPermissions(Path path) {
File file = path.toFile();
file.setReadable(true);
file.setWritable(true);
if (Files.isDirectory(path)) {
file.setExecutable(true);
}
}
private IOException createIOExceptionWithAttachedFailures(SortedMap failures) {
// @formatter:off
String joinedPaths = failures.keySet().stream()
.map(this::tryToDeleteOnExit)
.map(this::relativizeSafely)
.map(String::valueOf)
.collect(joining(", "));
// @formatter:on
IOException exception = new IOException("Failed to delete temp directory " + dir.toAbsolutePath()
+ ". The following paths could not be deleted (see suppressed exceptions for details): "
+ joinedPaths);
failures.values().forEach(exception::addSuppressed);
return exception;
}
private Path tryToDeleteOnExit(Path path) {
try {
path.toFile().deleteOnExit();
}
catch (UnsupportedOperationException ignore) {
}
return path;
}
private Path relativizeSafely(Path path) {
try {
return dir.relativize(path);
}
catch (IllegalArgumentException e) {
return path;
}
}
}
enum Scope {
PER_CONTEXT,
PER_DECLARATION
}
interface FileOperations {
FileOperations DEFAULT = Files::delete;
void delete(Path path) throws IOException;
}
}