[android_webview] Don't block the IO thread when reading from an InputStream.

android_webview/native/input_stream_reader_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "android_webview/native/input_stream.h"
+#include "android_webview/native/input_stream_reader.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/io_buffer.h"
+#include "net/http/http_byte_range.h"
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using android_webview::InputStream;
+using android_webview::InputStreamReader;
+using testing::DoAll;
+using testing::Ge;
+using testing::InSequence;
+using testing::Lt;
+using testing::Ne;
+using testing::NotNull;
+using testing::Return;
+using testing::SetArgPointee;
+using testing::Test;
+using testing::_;
+
+class MockInputStream : public InputStream {
+ public:
+  MockInputStream() {}
+  virtual ~MockInputStream() {}
+
+  MOCK_CONST_METHOD2(BytesAvailable, bool(JNIEnv* env, int* bytes_available));
+
+  MOCK_METHOD3(Skip,
+               bool(JNIEnv* env, int64_t n, int64_t* bytes_skipped));
+
+  MOCK_METHOD4(Read,
+               bool(JNIEnv* env,
+                    net::IOBuffer* dest,
+                    int length,
+                    int* bytes_read));
+};
+
+class CallbackReceiver {
+ public:
+  MOCK_METHOD1(OnSeekCompletion, void(int status));
+  MOCK_METHOD1(OnReadCompletion, void(int status));
+};
+
+class InputStreamReaderForTest : public InputStreamReader {
+ public:
+  InputStreamReaderForTest(InputStream* stream)
+      : InputStreamReader(stream) {
+  }
+
+ protected:
+  virtual void PostCompletionCallback(const net::CompletionCallback& callback,
+                                      int result) {
+    callback.Run(result);
+  }
+};
+
+class InputStreamReaderTest : public Test {
+ public:
+  InputStreamReaderTest()
+      : input_stream_reader_(&input_stream_) {
+  }
+ protected:
+  void SeekRange(int first_byte, int last_byte) {
+    net::HttpByteRange byte_range;
+    byte_range.set_first_byte_position(first_byte);
+    byte_range.set_last_byte_position(last_byte);
+    input_stream_reader_.Seek(
+        byte_range,
+        base::Bind(&CallbackReceiver::OnSeekCompletion,
+                   base::Unretained(&callback_receiver_)));
+  }
+
+  void ReadRawData(scoped_refptr<net::IOBuffer> buffer, int bytesToRead) {
+    input_stream_reader_.ReadRawData(
+        buffer.get(),
+        bytesToRead,
+        base::Bind(&CallbackReceiver::OnReadCompletion,
+                   base::Unretained(&callback_receiver_)));
+  }
+
+  MockInputStream input_stream_;
+  InputStreamReaderForTest input_stream_reader_;
+  CallbackReceiver callback_receiver_;
+};
+
+TEST_F(InputStreamReaderTest, BytesAvailableFailurePropagationOnSeek) {
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .WillOnce(Return(false));
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(Lt(0)))
+      .Times(1);
+
+  SeekRange(0, 0);
+}
+
+TEST_F(InputStreamReaderTest, SkipFailurePropagationOnSeek) {
+  const int streamSize = 10;
+  const int bytesToSkip = 5;
+
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<1>(streamSize),
+                      Return(true)));
+
+  EXPECT_CALL(input_stream_, Skip(_, bytesToSkip, NotNull()))
+      .WillOnce(Return(false));
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(Lt(0)))
+      .Times(1);
+
+  SeekRange(bytesToSkip, streamSize - 1);
+}
+
+TEST_F(InputStreamReaderTest, SeekToMiddle) {
+  const int streamSize = 10;
+  const int bytesToSkip = 5;
+
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<1>(streamSize),
+                      Return(true)));
+
+  EXPECT_CALL(input_stream_, Skip(_, bytesToSkip, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<2>(bytesToSkip),
+                      Return(true)));
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(bytesToSkip))
+      .Times(1);
+
+  SeekRange(bytesToSkip, streamSize - 1);
+}
+
+TEST_F(InputStreamReaderTest, SeekToMiddleInSteps) {
+  const int streamSize = 10;
+  const int bytesToSkip = 5;
+
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .Times(1)
+      .WillOnce(DoAll(SetArgPointee<1>(streamSize),
+                      Return(true)));
+
+  EXPECT_CALL(input_stream_, Skip(_, _, _))
+      .Times(0);
+  {
+    InSequence s;
+    EXPECT_CALL(input_stream_, Skip(_, bytesToSkip, NotNull()))
+        .WillOnce(DoAll(SetArgPointee<2>(bytesToSkip - 3),
+                        Return(true)))
+        .RetiresOnSaturation();
+    EXPECT_CALL(input_stream_, Skip(_, 3, NotNull()))
+        .WillOnce(DoAll(SetArgPointee<2>(1),
+                        Return(true)))
+        .RetiresOnSaturation();
+    EXPECT_CALL(input_stream_, Skip(_, 2, NotNull()))
+        .WillOnce(DoAll(SetArgPointee<2>(2),
+                        Return(true)))
+        .RetiresOnSaturation();
+  }
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(bytesToSkip))
+      .Times(1);
+
+  SeekRange(bytesToSkip, streamSize - 1);
+}
+
+TEST_F(InputStreamReaderTest, SeekEmpty) {
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<1>(0),
+                      Return(true)));
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(0))
+      .Times(1);
+
+  SeekRange(0, 0);
+}
+
+TEST_F(InputStreamReaderTest, SeekMoreThanAvailable) {
+  const int bytesAvailable = 256;
+  EXPECT_CALL(input_stream_, BytesAvailable(_, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<1>(bytesAvailable),
+                      Return(true)));
+
+  EXPECT_CALL(callback_receiver_, OnSeekCompletion(Lt(0)))
+      .Times(1);
+
+  SeekRange(bytesAvailable, 2 * bytesAvailable);
+}
+
+TEST_F(InputStreamReaderTest, ReadFailure) {
+  const int bytesToRead = 128;
+  scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(bytesToRead);
+  EXPECT_CALL(input_stream_, Read(_, buffer.get(), bytesToRead, NotNull()))
+      .WillOnce(Return(false));
+
+  EXPECT_CALL(callback_receiver_, OnReadCompletion(Lt(0)))
+      .Times(1);
+
+  ReadRawData(buffer, bytesToRead);
+}
+
+TEST_F(InputStreamReaderTest, ReadNothing) {
+  const int bytesToRead = 0;
+  // Size of net::IOBuffer can't be 0.
+  scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(1);
+  EXPECT_CALL(input_stream_, Read(_, buffer.get(), bytesToRead, NotNull()))
+      .Times(0);
+
+  EXPECT_CALL(callback_receiver_, OnReadCompletion(0))
+      .Times(1);
+
+  ReadRawData(buffer, bytesToRead);
+}
+
+TEST_F(InputStreamReaderTest, ReadSuccess) {
+  const int bytesToRead = 128;
+  scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(bytesToRead);
+
+  EXPECT_CALL(input_stream_, Read(_, buffer.get(), bytesToRead, NotNull()))
+      .WillOnce(DoAll(SetArgPointee<3>(bytesToRead),
+                      Return(true)));
+
+  EXPECT_CALL(callback_receiver_, OnReadCompletion(bytesToRead))
+      .Times(1);
+
+  ReadRawData(buffer, bytesToRead);
+}