Initial CL for Downloads resumption.

content/browser/download/download_item_impl_unittest.cc

Index: content/browser/download/download_item_impl_unittest.cc
diff --git a/content/browser/download/download_item_impl_unittest.cc b/content/browser/download/download_item_impl_unittest.cc
index 0301b8f780957346bfa668d39f2ecfe212f4eecd..0146b1b140908fd60043a5c6d8e27abaf44fdf86 100644
--- a/content/browser/download/download_item_impl_unittest.cc
+++ b/content/browser/download/download_item_impl_unittest.cc
@@ -2,6 +2,7 @@
 // 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"
@@ -15,12 +16,15 @@
 #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::NiceMock;
 using ::testing::Property;
 using ::testing::Return;
 using ::testing::SaveArg;
@@ -43,6 +47,10 @@ DownloadId::Domain kValidDownloadItemIdDomain = "valid DownloadId::Domain";
 
 class MockDelegate : public DownloadItemImplDelegate {
  public:
+  MockDelegate() : DownloadItemImplDelegate() {
+    SetDefaultExpectations();
+  }
+
   MOCK_METHOD2(DetermineDownloadTarget, void(
       DownloadItemImpl*, const DownloadTargetCallback&));
   MOCK_METHOD2(ShouldCompleteDownload,
@@ -51,12 +59,35 @@ class MockDelegate : public DownloadItemImplDelegate {
                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*));
+
+  void VerifyAndClearExpectations() {
+    ::testing::Mock::VerifyAndClearExpectations(this);
+    SetDefaultExpectations();
+  }
+
+ private:
+  void SetDefaultExpectations() {
+    EXPECT_CALL(*this, AssertStateConsistent(_))
+        .WillRepeatedly(Return());
+    EXPECT_CALL(*this, ShouldOpenFileBasedOnExtension(_))
+        .WillRepeatedly(Return(false));
+    EXPECT_CALL(*this, ShouldOpenDownload(_, _))
+        .WillRepeatedly(Return(true));
+  }
 };
 
 class MockRequestHandle : public DownloadRequestHandleInterface {
@@ -89,9 +120,12 @@ class DownloadItemTest : public testing::Test {
    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);
     }
 
@@ -100,17 +134,35 @@ class DownloadItemTest : public testing::Test {
     }
 
     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;
@@ -130,11 +182,22 @@ class DownloadItemTest : public testing::Test {
       return was_updated;
     }
 
+    int GetInterruptCount() {
+      return interrupt_count_;
+    }
+
+    int GetResumeCount() {
+      return resume_count_;
+    }
+
    private:
     DownloadItem* item_;
+    DownloadItem::DownloadState last_state_;
     bool removed_;
     bool destroyed_;
     bool updated_;
+    int interrupt_count_;
+    int resume_count_;
   };
 
   DownloadItemTest()
@@ -171,11 +234,8 @@ class DownloadItemTest : public testing::Test {
     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;
   }
@@ -196,12 +256,20 @@ class DownloadItemTest : public testing::Test {
       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());
+    mock_delegate()->VerifyAndClearExpectations();
+    EXPECT_CALL(*mock_delegate(), AssertStateConsistent(_))
+        .WillRepeatedly(Return());
+    EXPECT_CALL(*mock_delegate(), ShouldOpenFileBasedOnExtension(_))
+        .WillRepeatedly(Return(false));
+    EXPECT_CALL(*mock_delegate(), ShouldOpenDownload(_, _))
+        .WillRepeatedly(Return(true));
 
     return mock_download_file;
   }
@@ -220,6 +288,7 @@ class DownloadItemTest : public testing::Test {
     EXPECT_CALL(*download_file, RenameAndUniquify(intermediate_path, _))
         .WillOnce(ScheduleRenameCallback(DOWNLOAD_INTERRUPT_REASON_NONE,
                                          intermediate_path));
+    EXPECT_CALL(*mock_delegate(), ShowDownloadInBrowser(_));
     callback.Run(target_path, DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                  DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, intermediate_path);
     RunAllPendingInMessageLoops();
@@ -227,13 +296,17 @@ class DownloadItemTest : public testing::Test {
   }
 
   // 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());
-
-    EXPECT_CALL(*download_file, Cancel());
-    item->Cancel(true);
-    loop_.RunUntilIdle();
+  // 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());
+
+    if (expected_state == DownloadItem::IN_PROGRESS) {
+      EXPECT_CALL(*download_file, Cancel());
+      item->Cancel(true);
+      loop_.RunUntilIdle();
+    }
   }
 
   // Destroy a previously created download item.
@@ -254,7 +327,7 @@ class DownloadItemTest : public testing::Test {
   MessageLoopForUI loop_;
   TestBrowserThread ui_thread_;    // UI thread
   TestBrowserThread file_thread_;  // FILE thread
-  testing::NiceMock<MockDelegate> delegate_;
+  StrictMock<MockDelegate> delegate_;
   std::set<DownloadItem*> allocated_downloads_;
 };
 
@@ -319,8 +392,11 @@ TEST_F(DownloadItemTest, NotificationAfterInterrupted) {
   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());
 }
 
@@ -328,6 +404,7 @@ TEST_F(DownloadItemTest, NotificationAfterDelete) {
   DownloadItemImpl* item = CreateDownloadItem();
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
   EXPECT_CALL(*download_file, Cancel());
+  EXPECT_CALL(*mock_delegate(), DownloadRemoved(_));
   MockObserver observer(item);
 
   item->Delete(DownloadItem::DELETE_DUE_TO_BROWSER_SHUTDOWN);
@@ -342,10 +419,97 @@ TEST_F(DownloadItemTest, NotificationAfterDestroyed) {
   ASSERT_TRUE(observer.CheckDestroyed());
 }
 
+TEST_F(DownloadItemTest, ContinueAfterInterrupted) {
+  DownloadItemImpl* item = CreateDownloadItem();
+  MockObserver observer(item);
+  DownloadItemImplDelegate::DownloadTargetCallback callback;
+  MockDownloadFile* download_file = DoIntermediateRename(item);
+
+  // Interrupt the download, using a continuable interrupt.
+  EXPECT_CALL(*download_file, Detach());
+  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.GetInterruptCount());
+  ASSERT_EQ(0, observer.GetResumeCount());
+  RunAllPendingInMessageLoops();
+
+  CleanupItem(item, download_file, DownloadItem::INTERRUPTED);
+}
+
+// Same as above, but with a non-continuable interrupt.
+TEST_F(DownloadItemTest, RestartAfterInterrupted) {
+  DownloadItemImpl* item = CreateDownloadItem();
+  MockObserver observer(item);
+  DownloadItemImplDelegate::DownloadTargetCallback callback;
+  MockDownloadFile* download_file = DoIntermediateRename(item);
+
+  // Interrupt the download, using a restartable interrupt.
+  EXPECT_CALL(*download_file, Cancel());
+  item->DestinationObserverAsWeakPtr()->DestinationError(
+      DOWNLOAD_INTERRUPT_REASON_FILE_FAILED);
+  ASSERT_TRUE(observer.CheckUpdated());
+  // Should not try to auto-resume.
+  ASSERT_EQ(1, observer.GetInterruptCount());
+  ASSERT_EQ(0, observer.GetResumeCount());
+  RunAllPendingInMessageLoops();
+
+  CleanupItem(item, download_file, DownloadItem::INTERRUPTED);
+}
+
+TEST_F(DownloadItemTest, LimitRestartsAfterInterrupted) {
+  CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kEnableDownloadResumption);
+
+  DownloadItemImpl* item = CreateDownloadItem();
+  base::WeakPtr<DownloadDestinationObserver> as_observer(
+      item->DestinationObserverAsWeakPtr());
+  MockObserver observer(item);
+  MockDownloadFile* mock_download_file(NULL);
+  scoped_ptr<DownloadFile> download_file;
+  MockRequestHandle* mock_request_handle(NULL);
+  scoped_ptr<DownloadRequestHandleInterface> request_handle;
+
+  EXPECT_CALL(*mock_delegate(), DetermineDownloadTarget(item, _))
+      .WillRepeatedly(Return());
+  for (int i = 0; i < (DownloadItemImpl::kMaxAutoResumeAttempts + 1); ++i) {
+    DVLOG(20) << "Loop iteration " << i;
+
+    mock_download_file = new NiceMock<MockDownloadFile>;
+    download_file.reset(mock_download_file);
+    mock_request_handle = new NiceMock<MockRequestHandle>;
+    request_handle.reset(mock_request_handle);
+
+    // 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.GetResumeCount());
+
+    // Use a continuable interrupt.
+    item->DestinationObserverAsWeakPtr()->DestinationError(
+        DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR);
+
+    ASSERT_EQ(i + 1, observer.GetInterruptCount());
+  }
+
+  CleanupItem(item, mock_download_file, DownloadItem::INTERRUPTED);
+}
+
 TEST_F(DownloadItemTest, NotificationAfterRemove) {
   DownloadItemImpl* item = CreateDownloadItem();
   MockDownloadFile* download_file = AddDownloadFileToDownloadItem(item, NULL);
   EXPECT_CALL(*download_file, Cancel());
+  EXPECT_CALL(*mock_delegate(), DownloadRemoved(_));
   MockObserver observer(item);
 
   item->Remove();
@@ -406,6 +570,7 @@ TEST_F(DownloadItemTest, NotificationAfterOnDownloadTargetDetermined) {
   EXPECT_CALL(*download_file, RenameAndUniquify(intermediate_path, _))
       .WillOnce(ScheduleRenameCallback(DOWNLOAD_INTERRUPT_REASON_NONE,
                                        new_intermediate_path));
+  EXPECT_CALL(*mock_delegate(), ShowDownloadInBrowser(_));
 
   // Currently, a notification would be generated if the danger type is anything
   // other than NOT_DANGEROUS.
@@ -416,12 +581,20 @@ TEST_F(DownloadItemTest, NotificationAfterOnDownloadTargetDetermined) {
   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();
   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(_));
+  EXPECT_CALL(*mock_delegate(), DetermineDownloadTarget(_, _));
+  item->Start(download_file.Pass(), request_handle.Pass());
 
   item->Pause();
   ASSERT_TRUE(observer.CheckUpdated());
@@ -430,6 +603,10 @@ TEST_F(DownloadItemTest, NotificationAfterTogglePause) {
 
   item->Resume();
   ASSERT_TRUE(observer.CheckUpdated());
+
+  RunAllPendingInMessageLoops();
+
+  CleanupItem(item, mock_download_file, DownloadItem::IN_PROGRESS);
 }
 
 TEST_F(DownloadItemTest, DisplayName) {
@@ -446,13 +623,14 @@ TEST_F(DownloadItemTest, DisplayName) {
                                        intermediate_path));
   callback.Run(target_path, DownloadItem::TARGET_DISPOSITION_OVERWRITE,
                DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, intermediate_path);
+  EXPECT_CALL(*mock_delegate(), ShowDownloadInBrowser(_));
   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.
@@ -461,9 +639,12 @@ TEST_F(DownloadItemTest, Start) {
   scoped_ptr<DownloadFile> download_file(mock_download_file);
   DownloadItemImpl* item = CreateDownloadItem();
   EXPECT_CALL(*mock_download_file, Initialize(_));
-  item->Start(download_file.Pass());
+  scoped_ptr<DownloadRequestHandleInterface> request_handle(
+      new NiceMock<MockRequestHandle>);
+  EXPECT_CALL(*mock_delegate(), DetermineDownloadTarget(item, _));
+  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.
@@ -486,20 +667,18 @@ TEST_F(DownloadItemTest, CallbackAfterRename) {
   RunAllPendingInMessageLoops();
   // All the callbacks should have happened by now.
   ::testing::Mock::VerifyAndClearExpectations(download_file);
-  ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
+  mock_delegate()->VerifyAndClearExpectations();
 
   EXPECT_CALL(*mock_delegate(), ShouldCompleteDownload(item, _))
       .WillOnce(Return(true));
   EXPECT_CALL(*download_file, RenameAndAnnotate(final_path, _))
       .WillOnce(ScheduleRenameCallback(DOWNLOAD_INTERRUPT_REASON_NONE,
                                        final_path));
-  EXPECT_CALL(*mock_delegate(), ShouldOpenDownload(item, _))
-      .WillOnce(Return(true));
   EXPECT_CALL(*download_file, Detach());
   item->DestinationObserverAsWeakPtr()->DestinationCompleted("");
   RunAllPendingInMessageLoops();
   ::testing::Mock::VerifyAndClearExpectations(download_file);
-  ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
+  mock_delegate()->VerifyAndClearExpectations();
 }
 
 // Test that the delegate is invoked after the download file is renamed and the
@@ -525,7 +704,7 @@ TEST_F(DownloadItemTest, CallbackAfterInterruptedRename) {
   RunAllPendingInMessageLoops();
   // All the callbacks should have happened by now.
   ::testing::Mock::VerifyAndClearExpectations(download_file);
-  ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
+  mock_delegate()->VerifyAndClearExpectations();
 }
 
 TEST_F(DownloadItemTest, Interrupted) {
@@ -542,9 +721,9 @@ TEST_F(DownloadItemTest, Interrupted) {
   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());
 }
 
@@ -609,7 +788,7 @@ TEST_F(DownloadItemTest, DestinationError) {
   EXPECT_CALL(*download_file, Cancel());
   as_observer->DestinationError(
       DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED);
-  ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
+  mock_delegate()->VerifyAndClearExpectations();
   EXPECT_TRUE(observer.CheckUpdated());
   EXPECT_EQ(DownloadItem::INTERRUPTED, item->GetState());
   EXPECT_EQ(DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED,
@@ -637,7 +816,7 @@ TEST_F(DownloadItemTest, DestinationCompleted) {
   EXPECT_FALSE(item->AllDataSaved());
 
   as_observer->DestinationCompleted("livebeef");
-  ::testing::Mock::VerifyAndClearExpectations(mock_delegate());
+  mock_delegate()->VerifyAndClearExpectations();
   EXPECT_EQ(DownloadItem::IN_PROGRESS, item->GetState());
   EXPECT_TRUE(observer.CheckUpdated());
   EXPECT_EQ("livebeef", item->GetHash());
@@ -661,8 +840,6 @@ TEST_F(DownloadItemTest, EnabledActionsForNormalDownload) {
                                        FilePath(kDummyPath)));
   EXPECT_CALL(*mock_delegate(), ShouldCompleteDownload(item, _))
       .WillOnce(Return(true));
-  EXPECT_CALL(*mock_delegate(), ShouldOpenDownload(item, _))
-      .WillOnce(Return(true));
   EXPECT_CALL(*download_file, Detach());
   item->DestinationObserverAsWeakPtr()->DestinationCompleted("");
   RunAllPendingInMessageLoops();
@@ -690,8 +867,6 @@ TEST_F(DownloadItemTest, EnabledActionsForTemporaryDownload) {
   EXPECT_CALL(*download_file, RenameAndAnnotate(_, _))
       .WillOnce(ScheduleRenameCallback(DOWNLOAD_INTERRUPT_REASON_NONE,
                                        FilePath(kDummyPath)));
-  EXPECT_CALL(*mock_delegate(), ShouldOpenDownload(item, _))
-      .WillOnce(Return(true));
   EXPECT_CALL(*download_file, Detach());
   item->DestinationObserverAsWeakPtr()->DestinationCompleted("");
   RunAllPendingInMessageLoops();