Add perf test to measure duration of blob store digest computation.

+ Move BlobStoreTestUtils from cts/ to frameworks/base/tests/.

Bug: 148898557
Test: atest ./apct-tests/perftests/blobstore/src/com/android/perftests/blob/BlobStorePerfTests.java
Change-Id: I2de155d0c0c1fb602c57353ba4819bdc9cda8c0a

2 files changed, 247 insertions, 0 deletions

diff --git a/tests/BlobStoreTestUtils/Android.bp b/tests/BlobStoreTestUtils/Android.bp
new file mode 100644
index 000000000000..edd2b435f1da
--- /dev/null
+++ b/tests/BlobStoreTestUtils/Android.bp
@@ -0,0 +1,20 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// 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.
+
+java_library {
+  name: "BlobStoreTestUtils",
+  srcs: ["src/**/*.java"],
+  static_libs: ["truth-prebuilt"],
+  platform_apis: true
+}
\ No newline at end of file
diff --git a/tests/BlobStoreTestUtils/src/com/android/utils/blob/DummyBlobData.java b/tests/BlobStoreTestUtils/src/com/android/utils/blob/DummyBlobData.java
new file mode 100644
index 000000000000..f96766a1d3ad
--- /dev/null
+++ b/tests/BlobStoreTestUtils/src/com/android/utils/blob/DummyBlobData.java
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * 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.android.utils.blob;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.app.blob.BlobHandle;
+import android.app.blob.BlobStoreManager;
+import android.content.Context;
+import android.os.FileUtils;
+import android.os.ParcelFileDescriptor;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.RandomAccessFile;
+import java.nio.file.Files;
+import java.security.MessageDigest;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+
+public class DummyBlobData {
+    private static final long DEFAULT_SIZE_BYTES = 10 * 1024L * 1024L;
+    private static final int BUFFER_SIZE_BYTES = 16 * 1024;
+
+    private final Context mContext;
+    private final Random mRandom;
+    private final File mFile;
+    private final long mFileSize;
+    private final String mLabel;
+
+    byte[] mFileDigest;
+    long mExpiryTimeMs;
+
+    public DummyBlobData(Context context) {
+        this(context, new Random(0), "blob_" + System.nanoTime());
+    }
+
+    public DummyBlobData(Context context, long fileSize) {
+        this(context, fileSize, new Random(0), "blob_" + System.nanoTime(), "Test label");
+    }
+
+    public DummyBlobData(Context context, Random random, String fileName) {
+        this(context, DEFAULT_SIZE_BYTES, random, fileName, "Test label");
+    }
+
+    public DummyBlobData(Context context, Random random, String fileName, String label) {
+        this(context, DEFAULT_SIZE_BYTES, random, fileName, label);
+    }
+
+    public DummyBlobData(Context context, long fileSize, Random random, String fileName,
+            String label) {
+        mContext = context;
+        mRandom = random;
+        mFile = new File(mContext.getFilesDir(), fileName);
+        mFileSize = fileSize;
+        mLabel = label;
+    }
+
+    public void prepare() throws Exception {
+        try (RandomAccessFile file = new RandomAccessFile(mFile, "rw")) {
+            writeRandomData(file, mFileSize);
+        }
+        mFileDigest = FileUtils.digest(mFile, "SHA-256");
+        mExpiryTimeMs = System.currentTimeMillis() + TimeUnit.DAYS.toMillis(1);
+    }
+
+    public BlobHandle getBlobHandle() throws Exception {
+        return BlobHandle.createWithSha256(createSha256Digest(mFile), mLabel,
+                mExpiryTimeMs, "test_tag");
+    }
+
+    public long getFileSize() throws Exception {
+        return mFileSize;
+    }
+
+    public long getExpiryTimeMillis() {
+        return mExpiryTimeMs;
+    }
+
+    public void delete() {
+        mFile.delete();
+    }
+
+    public void writeToSession(BlobStoreManager.Session session) throws Exception {
+        writeToSession(session, 0, mFileSize);
+    }
+
+    public void writeToSession(BlobStoreManager.Session session,
+            long offsetBytes, long lengthBytes) throws Exception {
+        try (FileInputStream in = new FileInputStream(mFile)) {
+            in.getChannel().position(offsetBytes);
+            try (FileOutputStream out = new ParcelFileDescriptor.AutoCloseOutputStream(
+                    session.openWrite(offsetBytes, lengthBytes))) {
+                copy(in, out, lengthBytes);
+            }
+        }
+    }
+
+    public void writeToFd(FileDescriptor fd, long offsetBytes, long lengthBytes) throws Exception {
+        try (FileInputStream in = new FileInputStream(mFile)) {
+            in.getChannel().position(offsetBytes);
+            try (FileOutputStream out = new FileOutputStream(fd)) {
+                copy(in, out, lengthBytes);
+            }
+        }
+    }
+
+    private void copy(InputStream in, OutputStream out, long lengthBytes) throws Exception {
+        final byte[] buffer = new byte[BUFFER_SIZE_BYTES];
+        long bytesWrittern = 0;
+        while (bytesWrittern < lengthBytes) {
+            final int toWrite = (bytesWrittern + buffer.length <= lengthBytes)
+                    ? buffer.length : (int) (lengthBytes - bytesWrittern);
+            in.read(buffer, 0, toWrite);
+            out.write(buffer, 0, toWrite);
+            bytesWrittern += toWrite;
+        }
+    }
+
+    public void readFromSessionAndVerifyBytes(BlobStoreManager.Session session,
+            long offsetBytes, int lengthBytes) throws Exception {
+        final byte[] expectedBytes = new byte[lengthBytes];
+        try (FileInputStream in = new FileInputStream(mFile)) {
+            read(in, expectedBytes, offsetBytes, lengthBytes);
+        }
+
+        final byte[] actualBytes = new byte[lengthBytes];
+        try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream(
+                session.openWrite(0L, 0L))) {
+            read(in, actualBytes, offsetBytes, lengthBytes);
+        }
+
+        assertThat(actualBytes).isEqualTo(expectedBytes);
+
+    }
+
+    private void read(FileInputStream in, byte[] buffer,
+            long offsetBytes, int lengthBytes) throws Exception {
+        in.getChannel().position(offsetBytes);
+        in.read(buffer, 0, lengthBytes);
+    }
+
+    public void readFromSessionAndVerifyDigest(BlobStoreManager.Session session)
+            throws Exception {
+        readFromSessionAndVerifyDigest(session, 0, mFile.length());
+    }
+
+    public void readFromSessionAndVerifyDigest(BlobStoreManager.Session session,
+            long offsetBytes, long lengthBytes) throws Exception {
+        final byte[] actualDigest;
+        try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream(
+                session.openWrite(0L, 0L))) {
+            actualDigest = createSha256Digest(in, offsetBytes, lengthBytes);
+        }
+
+        assertThat(actualDigest).isEqualTo(mFileDigest);
+    }
+
+    public void verifyBlob(ParcelFileDescriptor pfd) throws Exception {
+        final byte[] actualDigest;
+        try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream(pfd)) {
+            actualDigest = FileUtils.digest(in, "SHA-256");
+        }
+        assertThat(actualDigest).isEqualTo(mFileDigest);
+    }
+
+    private byte[] createSha256Digest(FileInputStream in, long offsetBytes, long lengthBytes)
+            throws Exception {
+        final MessageDigest digest = MessageDigest.getInstance("SHA-256");
+        in.getChannel().position(offsetBytes);
+        final byte[] buffer = new byte[BUFFER_SIZE_BYTES];
+        long bytesRead = 0;
+        while (bytesRead < lengthBytes) {
+            int toRead = (bytesRead + buffer.length <= lengthBytes)
+                    ? buffer.length : (int) (lengthBytes - bytesRead);
+            toRead = in.read(buffer, 0, toRead);
+            digest.update(buffer, 0, toRead);
+            bytesRead += toRead;
+        }
+        return digest.digest();
+    }
+
+    private byte[] createSha256Digest(File file) throws Exception {
+        final MessageDigest digest = MessageDigest.getInstance("SHA-256");
+        try (BufferedInputStream in = new BufferedInputStream(
+                Files.newInputStream(file.toPath()))) {
+            final byte[] buffer = new byte[BUFFER_SIZE_BYTES];
+            int bytesRead;
+            while ((bytesRead = in.read(buffer)) > 0) {
+                digest.update(buffer, 0, bytesRead);
+            }
+        }
+        return digest.digest();
+    }
+
+    private void writeRandomData(RandomAccessFile file, long fileSize)
+            throws Exception {
+        long bytesWritten = 0;
+        final byte[] buffer = new byte[BUFFER_SIZE_BYTES];
+        while (bytesWritten < fileSize) {
+            mRandom.nextBytes(buffer);
+            final int toWrite = (bytesWritten + buffer.length <= fileSize)
+                    ? buffer.length : (int) (fileSize - bytesWritten);
+            file.seek(bytesWritten);
+            file.write(buffer, 0, toWrite);
+            bytesWritten += toWrite;
+        }
+    }
+}