delete the levelDB storage implementation.

components/offline_pages/offline_page_metadata_store_impl.cc

-// Copyright 2015 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 "components/offline_pages/offline_page_metadata_store_impl.h"
-
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "base/bind.h"
-#include "base/files/file_path.h"
-#include "base/location.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/sequenced_task_runner.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "build/build_config.h"
-#include "components/leveldb_proto/proto_database_impl.h"
-#include "components/offline_pages/offline_page_item.h"
-#include "components/offline_pages/offline_page_model.h"
-#include "components/offline_pages/proto/offline_pages.pb.h"
-#include "third_party/leveldatabase/env_chromium.h"
-#include "third_party/leveldatabase/src/include/leveldb/db.h"
-#include "url/gurl.h"
-
-using leveldb_proto::ProtoDatabase;
-
-namespace {
-// Statistics are logged to UMA with this string as part of histogram name. They
-// can all be found under LevelDB.*.OfflinePageMetadataStore. Changing this
-// needs to synchronize with histograms.xml, AND will also become incompatible
-// with older browsers still reporting the previous values.
-const char kDatabaseUMAClientName[] = "OfflinePageMetadataStore";
-}
-
-namespace offline_pages {
-namespace {
-
-void OfflinePageItemToEntry(const OfflinePageItem& item,
-                            offline_pages::OfflinePageEntry* item_proto) {
-  DCHECK(item_proto);
-  item_proto->set_url(item.url.spec());
-  item_proto->set_offline_id(item.offline_id);
-  item_proto->set_version(item.version);
-  std::string path_string;
-#if defined(OS_POSIX)
-  path_string = item.file_path.value();
-#elif defined(OS_WIN)
-  path_string = base::WideToUTF8(item.file_path.value());
-#endif
-  item_proto->set_file_path(path_string);
-  item_proto->set_file_size(item.file_size);
-  item_proto->set_creation_time(item.creation_time.ToInternalValue());
-  item_proto->set_last_access_time(item.last_access_time.ToInternalValue());
-  item_proto->set_access_count(item.access_count);
-  item_proto->set_flags(
-      static_cast<::offline_pages::OfflinePageEntry_Flags>(item.flags));
-  item_proto->set_client_id_name_space(item.client_id.name_space);
-  item_proto->set_client_id(item.client_id.id);
-}
-
-bool OfflinePageItemFromEntry(const offline_pages::OfflinePageEntry& item_proto,
-                              OfflinePageItem* item) {
-  DCHECK(item);
-  bool has_offline_id =
-      item_proto.has_offline_id() || item_proto.has_deprecated_bookmark_id();
-  if (!item_proto.has_url() || !has_offline_id || !item_proto.has_version() ||
-      !item_proto.has_file_path()) {
-    return false;
-  }
-  item->url = GURL(item_proto.url());
-  item->offline_id = item_proto.offline_id();
-  item->version = item_proto.version();
-#if defined(OS_POSIX)
-  item->file_path = base::FilePath(item_proto.file_path());
-#elif defined(OS_WIN)
-  item->file_path = base::FilePath(base::UTF8ToWide(item_proto.file_path()));
-#endif
-  if (item_proto.has_file_size()) {
-    item->file_size = item_proto.file_size();
-  }
-  if (item_proto.has_creation_time()) {
-    item->creation_time =
-        base::Time::FromInternalValue(item_proto.creation_time());
-  }
-  if (item_proto.has_last_access_time()) {
-    item->last_access_time =
-        base::Time::FromInternalValue(item_proto.last_access_time());
-  }
-  if (item_proto.has_access_count()) {
-    item->access_count = item_proto.access_count();
-  }
-  if (item_proto.has_flags()) {
-    item->flags = static_cast<OfflinePageItem::Flags>(item_proto.flags());
-  }
-  item->client_id.name_space = item_proto.client_id_name_space();
-  item->client_id.id = item_proto.client_id();
-
-  return true;
-}
-
-}  // namespace
-
-OfflinePageMetadataStoreImpl::OfflinePageMetadataStoreImpl(
-    scoped_refptr<base::SequencedTaskRunner> background_task_runner,
-    const base::FilePath& database_dir)
-    : background_task_runner_(background_task_runner),
-      database_dir_(database_dir),
-      weak_ptr_factory_(this) {
-}
-
-OfflinePageMetadataStoreImpl::~OfflinePageMetadataStoreImpl() {
-}
-
-void OfflinePageMetadataStoreImpl::Load(const LoadCallback& callback) {
-  // First initialize the database.
-  database_.reset(new leveldb_proto::ProtoDatabaseImpl<OfflinePageEntry>(
-      background_task_runner_));
-  database_->Init(kDatabaseUMAClientName, database_dir_,
-                  base::Bind(&OfflinePageMetadataStoreImpl::LoadContinuation,
-                             weak_ptr_factory_.GetWeakPtr(),
-                             callback));
-}
-
-void OfflinePageMetadataStoreImpl::LoadContinuation(
-    const LoadCallback& callback,
-    bool success) {
-  if (!success) {
-    NotifyLoadResult(callback,
-                     STORE_INIT_FAILED,
-                     std::vector<OfflinePageItem>());
-    return;
-  }
-
-  // After initialization, start to load the data.
-  database_->LoadEntries(
-      base::Bind(&OfflinePageMetadataStoreImpl::LoadDone,
-                 weak_ptr_factory_.GetWeakPtr(),
-                 callback));
-}
-
-void OfflinePageMetadataStoreImpl::LoadDone(
-    const LoadCallback& callback,
-    bool success,
-    std::unique_ptr<std::vector<OfflinePageEntry>> entries) {
-  DCHECK(entries);
-
-  std::vector<OfflinePageItem> result;
-  std::unique_ptr<ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
-      entries_to_update(new ProtoDatabase<OfflinePageEntry>::KeyEntryVector());
-  std::unique_ptr<std::vector<std::string>> keys_to_remove(
-      new std::vector<std::string>());
-
-  LoadStatus status = LOAD_SUCCEEDED;
-
-  if (success) {
-    for (auto& entry : *entries) {
-      OfflinePageItem item;
-      // We don't want to fail the entire database if one item is corrupt,
-      // so log error and keep going.
-      if (!OfflinePageItemFromEntry(entry, &item)) {
-        LOG(ERROR) << "failed to parse entry: " << entry.url() << " skipping.";
-        continue;
-      }
-      // Legacy storage.  We upgrade them to the new offline_id keyed storage.
-      // TODO(bburns): Remove this eventually when we are sure everyone is
-      // upgraded.
-      if (!entry.has_offline_id()) {
-        item.offline_id = OfflinePageModel::GenerateOfflineId();
-
-        if (!entry.has_deprecated_bookmark_id()) {
-          LOG(ERROR) << "unexpected entry missing bookmark id";
-          continue;
-        }
-        item.client_id.name_space = offline_pages::kBookmarkNamespace;
-        item.client_id.id = base::Int64ToString(entry.deprecated_bookmark_id());
-
-        OfflinePageEntry upgraded_entry;
-        OfflinePageItemToEntry(item, &upgraded_entry);
-        entries_to_update->push_back(
-            std::make_pair(base::Int64ToString(upgraded_entry.offline_id()),
-                           upgraded_entry));
-        // Remove the old entry that is indexed with deprecated id.
-        keys_to_remove->push_back(item.client_id.id);
-      }
-      result.push_back(item);
-    }
-  } else {
-    status = STORE_LOAD_FAILED;
-  }
-
-  // If we couldn't load _anything_ report a parse failure.
-  if (entries->size() > 0 && result.size() == 0) {
-    status = DATA_PARSING_FAILED;
-  }
-
-  if (status == LOAD_SUCCEEDED && entries_to_update->size() > 0) {
-    UpdateEntries(std::move(entries_to_update), std::move(keys_to_remove),
-                  base::Bind(&OfflinePageMetadataStoreImpl::DatabaseUpdateDone,
-                             weak_ptr_factory_.GetWeakPtr(), callback, status,
-                             std::move(result)));
-  } else {
-    NotifyLoadResult(callback, status, result);
-  }
-}
-
-void OfflinePageMetadataStoreImpl::NotifyLoadResult(
-    const LoadCallback& callback,
-    LoadStatus status,
-    const std::vector<OfflinePageItem>& result) {
-  UMA_HISTOGRAM_ENUMERATION("OfflinePages.LoadStatus",
-                            status,
-                            OfflinePageMetadataStore::LOAD_STATUS_COUNT);
-  if (status == LOAD_SUCCEEDED) {
-    UMA_HISTOGRAM_COUNTS("OfflinePages.SavedPageCount", result.size());
-  } else {
-    DVLOG(1) << "Offline pages database loading failed: " << status;
-    database_.reset();
-  }
-  callback.Run(status, result);
-}
-
-void OfflinePageMetadataStoreImpl::AddOrUpdateOfflinePage(
-    const OfflinePageItem& offline_page_item,
-    const UpdateCallback& callback) {
-  std::unique_ptr<ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
-      entries_to_save(new ProtoDatabase<OfflinePageEntry>::KeyEntryVector());
-  std::unique_ptr<std::vector<std::string>> keys_to_remove(
-      new std::vector<std::string>());
-
-  OfflinePageEntry offline_page_proto;
-  OfflinePageItemToEntry(offline_page_item, &offline_page_proto);
-
-  entries_to_save->push_back(std::make_pair(
-      base::Int64ToString(offline_page_item.offline_id), offline_page_proto));
-
-  UpdateEntries(std::move(entries_to_save), std::move(keys_to_remove),
-                callback);
-}
-
-void OfflinePageMetadataStoreImpl::RemoveOfflinePages(
-    const std::vector<int64_t>& offline_ids,
-    const UpdateCallback& callback) {
-  std::unique_ptr<ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
-      entries_to_save(new ProtoDatabase<OfflinePageEntry>::KeyEntryVector());
-  std::unique_ptr<std::vector<std::string>> keys_to_remove(
-      new std::vector<std::string>());
-
-  for (int64_t id : offline_ids)
-    keys_to_remove->push_back(base::Int64ToString(id));
-
-  UpdateEntries(std::move(entries_to_save), std::move(keys_to_remove),
-                callback);
-}
-
-void OfflinePageMetadataStoreImpl::UpdateEntries(
-    std::unique_ptr<ProtoDatabase<OfflinePageEntry>::KeyEntryVector>
-        entries_to_save,
-    std::unique_ptr<std::vector<std::string>> keys_to_remove,
-    const UpdateCallback& callback) {
-  if (!database_.get()) {
-    // Failing fast here, because DB is not initialized, and there is nothing
-    // that can be done about it.
-    // Callback is invoked through message loop to avoid improper retry and
-    // simplify testing.
-    DVLOG(1) << "Offline pages database not available in UpdateEntries.";
-    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                  base::Bind(callback, false));
-    return;
-  }
-
-  database_->UpdateEntries(
-      std::move(entries_to_save), std::move(keys_to_remove),
-      base::Bind(&OfflinePageMetadataStoreImpl::UpdateDone,
-                 weak_ptr_factory_.GetWeakPtr(), callback));
-}
-
-void OfflinePageMetadataStoreImpl::UpdateDone(
-    const OfflinePageMetadataStore::UpdateCallback& callback,
-    bool success) {
-  if (!success) {
-    // TODO(fgorski): Add UMA for this case. Consider rebuilding the store.
-    DVLOG(1) << "Offline pages database update failed.";
-  }
-
-  callback.Run(success);
-}
-
-void OfflinePageMetadataStoreImpl::Reset(const ResetCallback& callback) {
-  database_->Destroy(
-      base::Bind(&OfflinePageMetadataStoreImpl::ResetDone,
-                 weak_ptr_factory_.GetWeakPtr(),
-                 callback));
-}
-
-void OfflinePageMetadataStoreImpl::ResetDone(
-    const ResetCallback& callback,
-    bool success) {
-  database_.reset();
-  weak_ptr_factory_.InvalidateWeakPtrs();
-  callback.Run(success);
-}
-
-void OfflinePageMetadataStoreImpl::DatabaseUpdateDone(
-    const OfflinePageMetadataStore::LoadCallback& cb,
-    LoadStatus status,
-    const std::vector<OfflinePageItem>& result,
-    bool success) {
-  // If the update failed, log and keep going.  We'll try to
-  // update next time.
-  if (!success) {
-    LOG(ERROR) << "Failed to update database";
-  }
-  NotifyLoadResult(cb, status, result);
-}
-
-}  // namespace offline_pages