1 /* 2 * Copyright 2022 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.android.libraries.mobiledatadownload.file.openers; 17 18 import static com.google.android.libraries.mobiledatadownload.file.common.testing.StreamUtils.createFile; 19 import static com.google.common.truth.Truth.assertThat; 20 import static java.nio.charset.StandardCharsets.UTF_8; 21 import static org.junit.Assert.assertThrows; 22 23 import android.net.Uri; 24 import com.google.android.libraries.mobiledatadownload.file.SynchronousFileStorage; 25 import com.google.android.libraries.mobiledatadownload.file.backends.FileDescriptorUri; 26 import com.google.android.libraries.mobiledatadownload.file.backends.JavaFileBackend; 27 import com.google.android.libraries.mobiledatadownload.file.common.testing.FileDescriptorLeakChecker; 28 import com.google.android.libraries.mobiledatadownload.file.common.testing.TemporaryUri; 29 import com.google.common.collect.ImmutableList; 30 import com.google.common.io.CharStreams; 31 import java.io.File; 32 import java.io.FileInputStream; 33 import java.io.FileNotFoundException; 34 import java.io.InputStream; 35 import java.io.InputStreamReader; 36 import java.io.Reader; 37 import org.junit.Before; 38 import org.junit.Rule; 39 import org.junit.Test; 40 import org.junit.runner.RunWith; 41 import org.junit.runners.JUnit4; 42 43 @RunWith(JUnit4.class) 44 public final class NativeReadOpenerAndroidTest { 45 46 private SynchronousFileStorage storage; 47 48 @Rule public FileDescriptorLeakChecker leakChecker = new FileDescriptorLeakChecker(); 49 @Rule public TemporaryUri tmpUri = new TemporaryUri(); 50 51 @Before initStorage()52 public void initStorage() throws Exception { 53 storage = new SynchronousFileStorage(ImmutableList.of(new JavaFileBackend())); 54 } 55 56 @Test openForNativeRead_returnsAWorkingFileDescriptor()57 public void openForNativeRead_returnsAWorkingFileDescriptor() throws Exception { 58 Uri uri = tmpUri.newUri(); 59 createFile(storage, uri, "content"); 60 CloseableUri result = storage.open(uri, NativeReadOpener.create()); 61 62 assertThat(result.uri().getScheme()).isEqualTo("fd"); 63 assertThat(FileDescriptorUri.getFd(result.uri())).isGreaterThan(0); 64 65 // Use proc filesystem to verify data. 66 File fdFile = new File("/proc/self/fd/" + result.uri().getSchemeSpecificPart()); 67 InputStream in = new FileInputStream(fdFile); 68 Reader reader = new InputStreamReader(in, UTF_8); 69 assertThat(CharStreams.toString(reader)).isEqualTo("content"); 70 71 // Verify closing behavior. 72 assertThat(fdFile.exists()).isTrue(); 73 reader.close(); // This won't actually close the fd. 74 assertThat(fdFile.exists()).isTrue(); 75 result.close(); // This does. 76 assertThat(fdFile.exists()).isFalse(); 77 } 78 79 @Test openForNativeRead_withMissingFile_throwsFileNotFound()80 public void openForNativeRead_withMissingFile_throwsFileNotFound() throws Exception { 81 Uri uri = Uri.parse("file:/does-not-exist"); 82 assertThrows(FileNotFoundException.class, () -> storage.open(uri, NativeReadOpener.create())); 83 } 84 } 85