HADOOP-8992. Enhance unit-test coverage of class HarFileSystem (Ivan A. Veselovsky via bobby)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1413743 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -1152,6 +1152,9 @@ Release 0.23.6 - UNRELEASED
     HADOOP-9072. Hadoop-Common-0.23-Build Fails to build in Jenkins 
     (Robert Parker via tgraves)
 
+    HADOOP-8992. Enhance unit-test coverage of class HarFileSystem (Ivan A.
+    Veselovsky via bobby)
+
 Release 0.23.5 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/HarFileSystem.java

@@ -584,13 +584,6 @@ public class HarFileSystem extends FilterFileSystem {
     public String getName() {
       return name;
     }
-    
-    public List<String> getChildren() {
-      return children;
-    }
-    public String getFileName() {
-      return name;
-    }
     public String getPartName() {
       return partName;
     }
@@ -662,15 +655,6 @@ public class HarFileSystem extends FilterFileSystem {
         hstatus.getStartIndex(), hstatus.getLength(), bufferSize);
   }
  
-  /*
-   * create throws an exception in Har filesystem.
-   * The archive once created cannot be changed.
-   */
-  public FSDataOutputStream create(Path f, int bufferSize) 
-                                    throws IOException {
-    throw new IOException("Har: Create not allowed");
-  }
-  
   @Override
   public FSDataOutputStream create(Path f,
       FsPermission permission,
@@ -1106,4 +1090,11 @@ public class HarFileSystem extends FilterFileSystem {
       }
     }
   }
+  
+  /*
+   * testing purposes only:
+   */
+  HarMetaData getMetadata() {
+    return metadata;
+  }
 }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestHarFileSystemBasics.java

@@ -0,0 +1,297 @@
+/**
+ * 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.hadoop.fs;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * This test class checks basic operations with {@link HarFileSystem} including
+ * various initialization cases, getters, and modification methods.
+ * 
+ * NB: to run this test from an IDE make sure the folder
+ * "hadoop-common-project/hadoop-common/src/main/resources/" is added as a
+ * source path. This will allow the system to pick up the "core-default.xml" and
+ * "META-INF/services/..." resources from the class-path in the runtime.
+ */
+public class TestHarFileSystemBasics {
+
+  private static final String ROOT_PATH = System.getProperty("test.build.data",
+      "build/test/data");
+  private static final Path rootPath = new Path(
+      new File(ROOT_PATH).getAbsolutePath() + "/localfs");
+  // NB: .har suffix is necessary
+  private static final Path harPath = new Path(rootPath, "path1/path2/my.har");
+
+  private FileSystem localFileSystem;
+  private HarFileSystem harFileSystem;
+  private Configuration conf;
+
+  /*
+   * creates and returns fully initialized HarFileSystem
+   */
+  private HarFileSystem createHarFileSysten(final Configuration conf)
+      throws Exception {
+    localFileSystem = FileSystem.getLocal(conf);
+    localFileSystem.initialize(new URI("file:///"), conf);
+    localFileSystem.mkdirs(rootPath);
+    localFileSystem.mkdirs(harPath);
+    final Path indexPath = new Path(harPath, "_index");
+    final Path masterIndexPath = new Path(harPath, "_masterindex");
+    localFileSystem.createNewFile(indexPath);
+    assertTrue(localFileSystem.exists(indexPath));
+    localFileSystem.createNewFile(masterIndexPath);
+    assertTrue(localFileSystem.exists(masterIndexPath));
+
+    writeVersionToMasterIndexImpl(HarFileSystem.VERSION);
+
+    final HarFileSystem harFileSystem = new HarFileSystem(localFileSystem);
+    final URI uri = new URI("har://" + harPath.toString());
+    harFileSystem.initialize(uri, conf);
+    return harFileSystem;
+  }
+
+  private void writeVersionToMasterIndexImpl(int version) throws IOException {
+    final Path masterIndexPath = new Path(harPath, "_masterindex");
+    // write Har version into the master index:
+    final FSDataOutputStream fsdos = localFileSystem.create(masterIndexPath);
+    try {
+      String versionString = version + "\n";
+      fsdos.write(versionString.getBytes("UTF-8"));
+      fsdos.flush();
+    } finally {
+      fsdos.close();
+    }
+  }
+
+  @Before
+  public void before() throws Exception {
+    final File rootDirIoFile = new File(rootPath.toUri().getPath());
+    rootDirIoFile.mkdirs();
+    if (!rootDirIoFile.exists()) {
+      throw new IOException("Failed to create temp directory ["
+          + rootDirIoFile.getAbsolutePath() + "]");
+    }
+    // create Har to test:
+    conf = new Configuration();
+    harFileSystem = createHarFileSysten(conf);
+  }
+
+  @After
+  public void after() throws Exception {
+    // close Har FS:
+    final FileSystem harFS = harFileSystem;
+    if (harFS != null) {
+      harFS.close();
+      harFileSystem = null;
+    }
+    // cleanup: delete all the temporary files:
+    final File rootDirIoFile = new File(rootPath.toUri().getPath());
+    if (rootDirIoFile.exists()) {
+      FileUtil.fullyDelete(rootDirIoFile);
+    }
+    if (rootDirIoFile.exists()) {
+      throw new IOException("Failed to delete temp directory ["
+          + rootDirIoFile.getAbsolutePath() + "]");
+    }
+  }
+
+  // ======== Positive tests:
+
+  @Test
+  public void testPositiveHarFileSystemBasics() throws Exception {
+    // check Har version:
+    assertEquals(HarFileSystem.VERSION, harFileSystem.getHarVersion());
+
+    // check Har URI:
+    final URI harUri = harFileSystem.getUri();
+    assertEquals(harPath.toUri().getPath(), harUri.getPath());
+    assertEquals("har", harUri.getScheme());
+
+    // check Har home path:
+    final Path homePath = harFileSystem.getHomeDirectory();
+    assertEquals(harPath.toUri().getPath(), homePath.toUri().getPath());
+
+    // check working directory:
+    final Path workDirPath0 = harFileSystem.getWorkingDirectory();
+    assertEquals(homePath, workDirPath0);
+
+    // check that its impossible to reset the working directory
+    // (#setWorkingDirectory should have no effect):
+    harFileSystem.setWorkingDirectory(new Path("/foo/bar"));
+    assertEquals(workDirPath0, harFileSystem.getWorkingDirectory());
+  }
+
+  @Test
+  public void testPositiveNewHarFsOnTheSameUnderlyingFs() throws Exception {
+    // Init 2nd har file system on the same underlying FS, so the
+    // metadata gets reused:
+    final HarFileSystem hfs = new HarFileSystem(localFileSystem);
+    final URI uri = new URI("har://" + harPath.toString());
+    hfs.initialize(uri, new Configuration());
+    // the metadata should be reused from cache:
+    assertTrue(hfs.getMetadata() == harFileSystem.getMetadata());
+  }
+
+  @Test
+  public void testPositiveInitWithoutUnderlyingFS() throws Exception {
+    // Init HarFS with no constructor arg, so that the underlying FS object
+    // is created on demand or got from cache in #initialize() method.
+    final HarFileSystem hfs = new HarFileSystem();
+    final URI uri = new URI("har://" + harPath.toString());
+    hfs.initialize(uri, new Configuration());
+  }
+
+  // ========== Negative:
+
+  @Test
+  public void testNegativeInitWithoutIndex() throws Exception {
+    // delete the index file:
+    final Path indexPath = new Path(harPath, "_index");
+    localFileSystem.delete(indexPath, false);
+    // now init the HarFs:
+    final HarFileSystem hfs = new HarFileSystem(localFileSystem);
+    final URI uri = new URI("har://" + harPath.toString());
+    try {
+      hfs.initialize(uri, new Configuration());
+      Assert.fail("Exception expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+  }
+
+  @Test
+  public void testNegativeGetHarVersionOnNotInitializedFS() throws Exception {
+    final HarFileSystem hfs = new HarFileSystem(localFileSystem);
+    try {
+      int version = hfs.getHarVersion();
+      Assert.fail("Exception expected, but got a Har version " + version + ".");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+  }
+
+  @Test
+  public void testNegativeInitWithAnUnsupportedVersion() throws Exception {
+    // NB: should wait at least 1 second to ensure the timestamp of the master
+    // index will change upon the writing, because Linux seems to update the
+    // file modification
+    // time with 1 second accuracy:
+    Thread.sleep(1000);
+    // write an unsupported version:
+    writeVersionToMasterIndexImpl(7777);
+    // init the Har:
+    final HarFileSystem hfs = new HarFileSystem(localFileSystem);
+
+    // the metadata should *not* be reused from cache:
+    assertFalse(hfs.getMetadata() == harFileSystem.getMetadata());
+
+    final URI uri = new URI("har://" + harPath.toString());
+    try {
+      hfs.initialize(uri, new Configuration());
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+  }
+
+  @Test
+  public void testNegativeHarFsModifications() throws Exception {
+    // all the modification methods of HarFS must lead to IOE.
+    final Path fooPath = new Path(rootPath, "foo/bar");
+    localFileSystem.createNewFile(fooPath);
+    try {
+      harFileSystem.create(fooPath, new FsPermission("+rwx"), true, 1024,
+          (short) 88, 1024, null);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.setReplication(fooPath, (short) 55);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.delete(fooPath, true);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.mkdirs(fooPath, new FsPermission("+rwx"));
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    final Path indexPath = new Path(harPath, "_index");
+    try {
+      harFileSystem.copyFromLocalFile(false, indexPath, fooPath);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.startLocalOutput(fooPath, indexPath);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.completeLocalOutput(fooPath, indexPath);
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.setOwner(fooPath, "user", "group");
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+
+    try {
+      harFileSystem.setPermission(fooPath, new FsPermission("+x"));
+      Assert.fail("IOException expected.");
+    } catch (IOException ioe) {
+      // ok, expected.
+    }
+  }
+
+}