Make DownloadHistory observe manager, items

chrome/browser/download/chrome_download_manager_delegate.cc

Index: chrome/browser/download/chrome_download_manager_delegate.cc
diff --git a/chrome/browser/download/chrome_download_manager_delegate.cc b/chrome/browser/download/chrome_download_manager_delegate.cc
index 98bb3f2dc6069be38f0f1b9f6a23ce3ad8112a86..de50d41ed93849d7a6b3c29bb9ea0f8ea1ded7ab 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.cc
+++ b/chrome/browser/download/chrome_download_manager_delegate.cc
@@ -23,12 +23,16 @@
 #include "chrome/browser/download/download_history.h"
 #include "chrome/browser/download/download_path_reservation_tracker.h"
 #include "chrome/browser/download/download_prefs.h"
+#include "chrome/browser/download/download_service.h"
+#include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/download/download_status_updater.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/download/save_package_file_picker.h"
 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/history/history.h"
+#include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/intents/web_intents_util.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ -140,6 +144,21 @@ void OnWebIntentDispatchCompleted(
                           base::Bind(&DeleteFile, file_path));
 }
 
+typedef base::Callback<void(bool)> VisitedBeforeCallback;
+
+// Condenses the results from HistoryService::GetVisibleVisitCountToHost() to a
+// single bool so that VisitedBeforeCallback can curry up to 5 other parameters
+// without a struct.
+void VisitCountsToVisitedBefore(
+    const VisitedBeforeCallback& callback,
+    HistoryService::Handle unused_handle,
+    bool found_visits,
+    int count,
+    base::Time first_visit) {
+  callback.Run(found_visits && count &&
+      (first_visit.LocalMidnight() < base::Time::Now().LocalMidnight()));
+}
+
 }  // namespace
 
 ChromeDownloadManagerDelegate::ChromeDownloadManagerDelegate(Profile* profile)
@@ -153,18 +172,6 @@ ChromeDownloadManagerDelegate::~ChromeDownloadManagerDelegate() {
 
 void ChromeDownloadManagerDelegate::SetDownloadManager(DownloadManager* dm) {
   download_manager_ = dm;
-  download_history_.reset(new DownloadHistory(profile_));
-  if (!profile_->IsOffTheRecord()) {
-    // DownloadManager should not be RefCountedThreadSafe.
-    // ChromeDownloadManagerDelegate outlives DownloadManager, and
-    // DownloadHistory uses a scoped canceller to cancel tasks when it is
-    // deleted. Almost all callbacks to DownloadManager should use weak pointers
-    // or bounce off a container object that uses ManagerGoingDown() to simulate
-    // a weak pointer.
-    download_history_->Load(
-        base::Bind(&DownloadManager::OnPersistentStoreQueryComplete,
-                   download_manager_));
-  }
 #if !defined(OS_ANDROID)
   extension_event_router_.reset(new ExtensionDownloadsEventRouter(
       profile_, download_manager_));
@@ -172,7 +179,6 @@ void ChromeDownloadManagerDelegate::SetDownloadManager(DownloadManager* dm) {
 }
 
 void ChromeDownloadManagerDelegate::Shutdown() {
-  download_history_.reset();
   download_prefs_.reset();
 #if !defined(OS_ANDROID)
   extension_event_router_.reset();
@@ -479,42 +485,6 @@ bool ChromeDownloadManagerDelegate::GenerateFileHash() {
 #endif
 }
 
-void ChromeDownloadManagerDelegate::AddItemToPersistentStore(
-    DownloadItem* item) {
-  if (profile_->IsOffTheRecord()) {
-    OnItemAddedToPersistentStore(
-        item->GetId(), download_history_->GetNextFakeDbHandle());
-    return;
-  }
-  download_history_->AddEntry(item,
-      base::Bind(&ChromeDownloadManagerDelegate::OnItemAddedToPersistentStore,
-                 this));
-}
-
-void ChromeDownloadManagerDelegate::UpdateItemInPersistentStore(
-    DownloadItem* item) {
-  download_history_->UpdateEntry(item);
-}
-
-void ChromeDownloadManagerDelegate::UpdatePathForItemInPersistentStore(
-    DownloadItem* item,
-    const FilePath& new_path) {
-  download_history_->UpdateDownloadPath(item, new_path);
-}
-
-void ChromeDownloadManagerDelegate::RemoveItemFromPersistentStore(
-    DownloadItem* item) {
-  download_history_->RemoveEntry(item);
-}
-
-void ChromeDownloadManagerDelegate::RemoveItemsFromPersistentStoreBetween(
-    base::Time remove_begin,
-    base::Time remove_end) {
-  if (profile_->IsOffTheRecord())
-    return;
-  download_history_->RemoveEntriesBetween(remove_begin, remove_end);
-}
-
 void ChromeDownloadManagerDelegate::GetSaveDir(BrowserContext* browser_context,
                                                FilePath* website_save_dir,
                                                FilePath* download_save_dir,
@@ -637,10 +607,22 @@ void ChromeDownloadManagerDelegate::CheckDownloadUrlDone(
   if (result != DownloadProtectionService::SAFE)
     danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL;
 
-  download_history_->CheckVisitedReferrerBefore(
-      download_id, download->GetReferrerUrl(),
-      base::Bind(&ChromeDownloadManagerDelegate::CheckVisitedReferrerBeforeDone,
-                 this, download_id, callback, danger_type));
+  // HistoryServiceFactory redirects incognito profiles to on-record profiles.
+  HistoryService* history = HistoryServiceFactory::GetForProfile(
+      profile_, Profile::EXPLICIT_ACCESS);
+  if (!history || !download->GetReferrerUrl().is_valid()) {
+    // If the original profile doesn't have a HistoryService or the referrer url
+    // is invalid, then give up and assume the referrer has not been visited
+    // before. There's no history for on-record profiles in unit_tests, for
+    // example.
+    CheckVisitedReferrerBeforeDone(download_id, callback, danger_type, false);
+    return;
+  }
+  history->GetVisibleVisitCountToHost(
+      download->GetReferrerUrl(), &history_consumer_,
+      base::Bind(&VisitCountsToVisitedBefore, base::Bind(
+          &ChromeDownloadManagerDelegate::CheckVisitedReferrerBeforeDone,
+          this, download_id, callback, danger_type)));
 }
 
 void ChromeDownloadManagerDelegate::CheckClientDownloadDone(
@@ -792,8 +774,8 @@ void ChromeDownloadManagerDelegate::CheckVisitedReferrerBeforeDone(
       profile_, suggested_path, download,
       base::Bind(
           &ChromeDownloadManagerDelegate::SubstituteDriveDownloadPathCallback,
-          this, download->GetId(), callback, should_prompt, is_forced_path,
-          danger_type));
+          this, download->GetId(), callback, should_prompt,
+          is_forced_path, danger_type));
 #else
   GetReservedPath(
       *download, suggested_path, download_prefs_->DownloadPath(),
@@ -885,15 +867,3 @@ void ChromeDownloadManagerDelegate::OnTargetPathDetermined(
   }
   callback.Run(target_path, disposition, danger_type, intermediate_path);
 }
-
-void ChromeDownloadManagerDelegate::OnItemAddedToPersistentStore(
-    int32 download_id, int64 db_handle) {
-  // It's not immediately obvious, but HistoryBackend::CreateDownload() can
-  // call this function with an invalid |db_handle|. For instance, this can
-  // happen when the history database is offline. We cannot have multiple
-  // DownloadItems with the same invalid db_handle, so we need to assign a
-  // unique |db_handle| here.
-  if (db_handle == DownloadItem::kUninitializedHandle)
-    db_handle = download_history_->GetNextFakeDbHandle();
-  download_manager_->OnItemAddedToPersistentStore(download_id, db_handle);
-}