Initial CL for Downloads resumption.

content/browser/download/download_item_impl_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 "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "base/threading/thread.h"
 #include "content/browser/download/byte_stream.h"
 #include "content/browser/download/download_create_info.h"
 #include "content/browser/download/download_file_factory.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/browser/download/download_item_impl_delegate.h"
 #include "content/browser/download/download_request_handle.h"
 #include "content/browser/download/mock_download_file.h"
 #include "content/public/browser/download_id.h"
 #include "content/public/browser/download_destination_observer.h"
 #include "content/public/browser/download_interrupt_reasons.h"
+#include "content/public/browser/download_url_parameters.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/mock_download_item.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AllOf;
+using ::testing::NiceMock;
 using ::testing::Property;
 using ::testing::Return;
 using ::testing::SaveArg;
 using ::testing::StrictMock;
 
 namespace content {
 DownloadId::Domain kValidDownloadItemIdDomain = "valid DownloadId::Domain";
 
 namespace {
 class MockDelegate : public DownloadItemImplDelegate {
  public:
   MOCK_METHOD2(DetermineDownloadTarget, void(
       DownloadItemImpl*, const DownloadTargetCallback&));
   MOCK_METHOD2(ShouldOpenDownload,
                bool(DownloadItemImpl*, const ShouldOpenDownloadCallback&));
   MOCK_METHOD1(ShouldOpenFileBasedOnExtension, bool(const FilePath&));
   MOCK_METHOD1(CheckForFileRemoval, void(DownloadItemImpl*));
+
+  virtual void ResumeInterruptedDownload(
+      scoped_ptr<DownloadUrlParameters> params, DownloadId id) OVERRIDE {
+    MockResumeInterruptedDownload(params.get(), id);
+  }
+  MOCK_METHOD2(MockResumeInterruptedDownload,
+               void(DownloadUrlParameters* params, DownloadId id));
+
   MOCK_CONST_METHOD0(GetBrowserContext, BrowserContext*());
   MOCK_METHOD1(UpdatePersistence, void(DownloadItemImpl*));
   MOCK_METHOD1(DownloadOpened, void(DownloadItemImpl*));
   MOCK_METHOD1(DownloadRemoved, void(DownloadItemImpl*));
   MOCK_METHOD1(ShowDownloadInBrowser, void(DownloadItemImpl*));
   MOCK_CONST_METHOD1(AssertStateConsistent, void(DownloadItemImpl*));
 };
 
 class MockRequestHandle : public DownloadRequestHandleInterface {
  public:
@@ skipping 18 matching lines @@
 }
 
 }  // namespace
 
 class DownloadItemTest : public testing::Test {
  public:
   class MockObserver : public DownloadItem::Observer {
    public:
     explicit MockObserver(DownloadItem* item)
       : item_(item),
+        last_state_(item->GetState()),
         removed_(false),
         destroyed_(false),
-        updated_(false) {
+        updated_(false),
+        interrupt_count_(0),
+        resume_count_(0) {
       item_->AddObserver(this);
     }
 
     virtual ~MockObserver() {
       if (item_) item_->RemoveObserver(this);
     }
 
     virtual void OnDownloadRemoved(DownloadItem* download) {
+      DVLOG(20) << " " << __FUNCTION__
+                << " download = " << download->DebugString(false);
       removed_ = true;
     }
 
     virtual void OnDownloadUpdated(DownloadItem* download) {
+      DVLOG(20) << " " << __FUNCTION__
+                << " download = " << download->DebugString(false);
       updated_ = true;
+      DownloadItem::DownloadState new_state = download->GetState();
+      if (last_state_ == DownloadItem::IN_PROGRESS &&
+          new_state == DownloadItem::INTERRUPTED) {
+        interrupt_count_++;
+      }
+      if (last_state_ == DownloadItem::INTERRUPTED &&
+          new_state == DownloadItem::IN_PROGRESS) {
+        resume_count_++;
+      }
+      last_state_ = new_state;
     }
 
     virtual void OnDownloadOpened(DownloadItem* download) {
+      DVLOG(20) << " " << __FUNCTION__
+                << " download = " << download->DebugString(false);
     }
 
     virtual void OnDownloadDestroyed(DownloadItem* download) {
+      DVLOG(20) << " " << __FUNCTION__
+                << " download = " << download->DebugString(false);
       destroyed_ = true;
       item_->RemoveObserver(this);
       item_ = NULL;
     }
 
     bool CheckRemoved() {
       return removed_;
     }
 
     bool CheckDestroyed() {
       return destroyed_;
     }
 
     bool CheckUpdated() {
       bool was_updated = updated_;
       updated_ = false;
       return was_updated;
     }
 
+    int CheckInterrupted() {
+      return interrupt_count_;
+    }
+
+    int CheckResumed() {
+      return resume_count_;
+    }
+
    private:
     DownloadItem* item_;
+    DownloadItem::DownloadState last_state_;
     bool removed_;
     bool destroyed_;
     bool updated_;
+    int interrupt_count_;
+    int resume_count_;
   };
 
   DownloadItemTest()
       : ui_thread_(BrowserThread::UI, &loop_),
         file_thread_(BrowserThread::FILE, &loop_),
         delegate_() {
   }
 
   ~DownloadItemTest() {
   }
@@ skipping 16 matching lines @@
     // don't call the function that deletes it, so we do so ourselves.
     scoped_ptr<DownloadCreateInfo> info_;
 
     info_.reset(new DownloadCreateInfo());
     static int next_id;
     info_->download_id = DownloadId(kValidDownloadItemIdDomain, ++next_id);
     info_->save_info = scoped_ptr<DownloadSaveInfo>(new DownloadSaveInfo());
     info_->save_info->prompt_for_save_location = false;
     info_->url_chain.push_back(GURL());
 
-    scoped_ptr<DownloadRequestHandleInterface> request_handle(
-        new testing::NiceMock<MockRequestHandle>);
     DownloadItemImpl* download =
-        new DownloadItemImpl(&delegate_, *(info_.get()),
-                             request_handle.Pass(), net::BoundNetLog());
+        new DownloadItemImpl(&delegate_, *(info_.get()), net::BoundNetLog());
     allocated_downloads_.insert(download);
     return download;
   }
 
   // Add DownloadFile to DownloadItem
   MockDownloadFile* AddDownloadFileToDownloadItem(
       DownloadItemImpl* item,
       DownloadItemImplDelegate::DownloadTargetCallback *callback) {
     MockDownloadFile* mock_download_file(new StrictMock<MockDownloadFile>);
     scoped_ptr<DownloadFile> download_file(mock_download_file);
     EXPECT_CALL(*mock_download_file, Initialize(_));
     if (callback) {
       // Save the callback.
       EXPECT_CALL(*mock_delegate(), DetermineDownloadTarget(item, _))
           .WillOnce(SaveArg<1>(callback));
     } else {
       // Drop it on the floor.
       EXPECT_CALL(*mock_delegate(), DetermineDownloadTarget(item, _));
     }
 
-    item->Start(download_file.Pass());
+    scoped_ptr<DownloadRequestHandleInterface> request_handle(
+        new NiceMock<MockRequestHandle>);
+    item->Start(download_file.Pass(), request_handle.Pass());
     loop_.RunUntilIdle();
 
     // So that we don't have a function writing to a stack variable
     // lying around if the above failed.
     ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
 
     return mock_download_file;
   }
 
   // Cleanup a download item (specifically get rid of the DownloadFile on it).
-  // The item must be in the IN_PROGRESS state.
-  void CleanupItem(DownloadItemImpl* item, MockDownloadFile* download_file) {
-    EXPECT_EQ(DownloadItem::IN_PROGRESS, item->GetState());
+  // The item must be in the expected state.
+  void CleanupItem(DownloadItemImpl* item,
+                   MockDownloadFile* download_file,
+                   DownloadItem::DownloadState expected_state) {
+    EXPECT_EQ(expected_state, item->GetState());
 
-    EXPECT_CALL(*download_file, Cancel());
-    item->Cancel(true);
-    loop_.RunUntilIdle();
+    if (expected_state == DownloadItem::IN_PROGRESS) {
+      EXPECT_CALL(*download_file, Cancel());
+      item->Cancel(true);
+      loop_.RunUntilIdle();
+    }
   }
 
   // Destroy a previously created download item.
   void DestroyDownloadItem(DownloadItem* item) {
     allocated_downloads_.erase(item);
     delete item;
   }
 
   void RunAllPendingInMessageLoops() {
     loop_.RunUntilIdle();
@@ skipping 75 matching lines @@
   item->OnDownloadedFileRemoved();
   ASSERT_TRUE(observer.CheckUpdated());
 }
 
 TEST_F(DownloadItemTest, NotificationAfterInterrupted) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
   EXPECT_CALL(*download_file, Cancel());
   MockObserver observer(item);
 
+  EXPECT_CALL(*mock_delegate(), MockResumeInterruptedDownload(_,_))
+      .Times(0);
+
   item->DestinationObserverAsWeakPtr()->DestinationError(
-      DOWNLOAD_INTERRUPT_REASON_NONE);
+      DOWNLOAD_INTERRUPT_REASON_FILE_FAILED);
   ASSERT_TRUE(observer.CheckUpdated());
 }
 
 TEST_F(DownloadItemTest, NotificationAfterDelete) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
   EXPECT_CALL(*download_file, Cancel());
   MockObserver observer(item);
 
   item->Delete(DownloadItem::DELETE_DUE_TO_BROWSER_SHUTDOWN);
   ASSERT_TRUE(observer.CheckUpdated());
 }
 
 TEST_F(DownloadItemTest, NotificationAfterDestroyed) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockObserver observer(item);
 
   DestroyDownloadItem(item);
   ASSERT_TRUE(observer.CheckDestroyed());
 }
 
+TEST_F(DownloadItemTest, RestartAfterInterrupted) {
+  DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
+  MockObserver observer(item);
+  MockDownloadFile* mock_download_file(new NiceMock<MockDownloadFile>);
+  scoped_ptr<DownloadFile> download_file(mock_download_file);
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      new NiceMock<MockRequestHandle>);
+
+  EXPECT_CALL(*mock_download_file, Initialize(_));
+  item->Start(download_file.Pass(), request_handle.Pass());
+
+  EXPECT_CALL(*mock_download_file, Detach());
+  // Use a continuable interrupt.
+  item->DestinationObserverAsWeakPtr()->DestinationError(
+      DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR);
+  ASSERT_TRUE(observer.CheckUpdated());
+  // Should attempt to auto-resume.  Because we don't have a mock WebContents,
+  // ResumeInterruptedDownload() will abort early, with another interrupt,
+  // which will be ignored.
+  ASSERT_EQ(1, observer.CheckInterrupted());
+  ASSERT_EQ(0, observer.CheckResumed());
+  RunAllPendingInMessageLoops();
+
+  mock_download_file = new NiceMock<MockDownloadFile>;
+  download_file.reset(mock_download_file);
+  request_handle.reset(new NiceMock<MockRequestHandle>);
+
+  EXPECT_CALL(*mock_download_file, Initialize(_));
+  item->Start(download_file.Pass(), request_handle.Pass());
+  ASSERT_EQ(1, observer.CheckResumed());
+
+  // Use a non-resumable interrupt.
+  EXPECT_CALL(*mock_download_file, Cancel());
+  item->DestinationObserverAsWeakPtr()->DestinationError(
+      DOWNLOAD_INTERRUPT_REASON_FILE_FAILED);
+  ASSERT_TRUE(observer.CheckUpdated());
+  // Should not try to auto-resume.
+  ASSERT_EQ(2, observer.CheckInterrupted());
+  ASSERT_EQ(1, observer.CheckResumed());
+  RunAllPendingInMessageLoops();
+
+  CleanupItem(item, mock_download_file, DownloadItem::INTERRUPTED);
+}
+
+TEST_F(DownloadItemTest, LimitRestartsAfterInterrupted) {
+  CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kEnableDownloadResumption);
+
+  DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
+  base::WeakPtr<DownloadDestinationObserver> as_observer(
+      item->DestinationObserverAsWeakPtr());
+  MockObserver observer(item);
+  MockDownloadFile* mock_download_file(new NiceMock<MockDownloadFile>);
+  scoped_ptr<DownloadFile> download_file(mock_download_file);
+  MockRequestHandle* mock_request_handle = new NiceMock<MockRequestHandle>;
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      mock_request_handle);
+
+  for (int i = 0; i < (DownloadItemImpl::kMaxAutoResumeAttempts + 2); ++i) {
+    DVLOG(20) << "Loop iteration " << i;
+
+    // It's too complicated to set up a WebContents instance that would cause
+    // the MockDownloadItemDelegate's ResumeInterruptedDownload() function
+    // to be callled, so we simply verify that GetWebContents() is called.
+    if (i < (DownloadItemImpl::kMaxAutoResumeAttempts - 1)) {
+      EXPECT_CALL(*mock_request_handle, GetWebContents())
+          .WillOnce(Return(static_cast<WebContents*>(NULL)));
+    }
+
+    item->Start(download_file.Pass(), request_handle.Pass());
+
+    ASSERT_EQ(i, observer.CheckResumed());
+
+    // Use a continuable interrupt.
+    item->DestinationObserverAsWeakPtr()->DestinationError(
+        DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR);
+
+    mock_download_file = new NiceMock<MockDownloadFile>;
+    download_file.reset(mock_download_file);
+    mock_request_handle = new NiceMock<MockRequestHandle>;
+    request_handle.reset(mock_request_handle);
+
+    ASSERT_EQ(i + 1, observer.CheckInterrupted());
+  }
+
+  CleanupItem(item, mock_download_file, DownloadItem::INTERRUPTED);
+}
+
 TEST_F(DownloadItemTest, NotificationAfterRemove) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
   EXPECT_CALL(*download_file, Cancel());
   MockObserver observer(item);
 
   item->Remove();
   ASSERT_TRUE(observer.CheckUpdated());
   ASSERT_TRUE(observer.CheckRemoved());
 }
@@ skipping 54 matching lines @@
 
   // Currently, a notification would be generated if the danger type is anything
   // other than NOT_DANGEROUS.
   callback.Run(target_path, DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, intermediate_path);
   EXPECT_FALSE(observer.CheckUpdated());
   RunAllPendingInMessageLoops();
   EXPECT_TRUE(observer.CheckUpdated());
   EXPECT_EQ(new_intermediate_path, item->GetFullPath());
 
-  CleanupItem(item, download_file);
+  CleanupItem(item, download_file, DownloadItem::IN_PROGRESS);
 }
 
 TEST_F(DownloadItemTest, NotificationAfterTogglePause) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockObserver observer(item);
+  MockDownloadFile* mock_download_file(new MockDownloadFile);
+  scoped_ptr<DownloadFile> download_file(mock_download_file);
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      new NiceMock<MockRequestHandle>);
+
+  EXPECT_CALL(*mock_download_file, Initialize(_));
+  item->Start(download_file.Pass(), request_handle.Pass());
 
   item->TogglePause();
   ASSERT_TRUE(observer.CheckUpdated());
 
   item->TogglePause();
   ASSERT_TRUE(observer.CheckUpdated());
+  RunAllPendingInMessageLoops();
+
+  CleanupItem(item, mock_download_file, DownloadItem::IN_PROGRESS);
 }
 
 TEST_F(DownloadItemTest, DisplayName) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   DownloadItemImplDelegate::DownloadTargetCallback callback;
   MockDownloadFile* download_file =
       AddDownloadFileToDownloadItem(item, &callback);
   FilePath target_path(FilePath(kDummyPath).AppendASCII("foo.bar"));
   FilePath intermediate_path(target_path.InsertBeforeExtensionASCII("x"));
   EXPECT_EQ(FILE_PATH_LITERAL(""),
             item->GetFileNameToReportUser().value());
   EXPECT_CALL(*download_file, RenameAndUniquify(_, _))
       .WillOnce(ScheduleRenameCallback(DOWNLOAD_INTERRUPT_REASON_NONE,
                                        intermediate_path));
   callback.Run(target_path, DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, intermediate_path);
   RunAllPendingInMessageLoops();
   EXPECT_EQ(FILE_PATH_LITERAL("foo.bar"),
             item->GetFileNameToReportUser().value());
   item->SetDisplayName(FilePath(FILE_PATH_LITERAL("new.name")));
   EXPECT_EQ(FILE_PATH_LITERAL("new.name"),
             item->GetFileNameToReportUser().value());
-  CleanupItem(item, download_file);
+  CleanupItem(item, download_file, DownloadItem::IN_PROGRESS);
 }
 
 // Test to make sure that Start method calls DF initialize properly.
 TEST_F(DownloadItemTest, Start) {
   MockDownloadFile* mock_download_file(new MockDownloadFile);
   scoped_ptr<DownloadFile> download_file(mock_download_file);
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   EXPECT_CALL(*mock_download_file, Initialize(_));
-  item->Start(download_file.Pass());
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      new NiceMock<MockRequestHandle>);
+  item->Start(download_file.Pass(), request_handle.Pass());
 
-  CleanupItem(item, mock_download_file);
+  CleanupItem(item, mock_download_file, DownloadItem::IN_PROGRESS);
 }
 
 // Test that the delegate is invoked after the download file is renamed.
 TEST_F(DownloadItemTest, CallbackAfterRename) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   DownloadItemImplDelegate::DownloadTargetCallback callback;
   MockDownloadFile* download_file =
       AddDownloadFileToDownloadItem(item, &callback);
   FilePath final_path(FilePath(kDummyPath).AppendASCII("foo.bar"));
   FilePath intermediate_path(final_path.InsertBeforeExtensionASCII("x"));
@@ skipping 56 matching lines @@
   const DownloadInterruptReason reason(
       DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED);
 
   // Confirm interrupt sets state properly.
   EXPECT_CALL(*download_file, Cancel());
   item->DestinationObserverAsWeakPtr()->DestinationError(reason);
   RunAllPendingInMessageLoops();
   EXPECT_EQ(DownloadItem::INTERRUPTED, item->GetState());
   EXPECT_EQ(reason, item->GetLastReason());
 
-  // Cancel should result in no change.
+  // Cancel should kill it.
   item->Cancel(true);
-  EXPECT_EQ(DownloadItem::INTERRUPTED, item->GetState());
+  EXPECT_EQ(DownloadItem::CANCELLED, item->GetState());
   EXPECT_EQ(DOWNLOAD_INTERRUPT_REASON_USER_CANCELED, item->GetLastReason());
 }
 
 TEST_F(DownloadItemTest, Canceled) {
   DownloadItemImpl* item = CreateDownloadItem(DownloadItem::IN_PROGRESS);
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
 
   // Confirm cancel sets state properly.
   EXPECT_CALL(*download_file, Cancel());
   item->Cancel(true);
@@ skipping 85 matching lines @@
   EXPECT_EQ("livebeef", item->GetHash());
   EXPECT_EQ("", item->GetHashState());
   EXPECT_TRUE(item->AllDataSaved());
 }
 
 TEST(MockDownloadItem, Compiles) {
   MockDownloadItem mock_item;
 }
 
 }  // namespace content