DOMStorageContextImpl that's implemented in terms of the new dom_storage classes.

content/browser/dom_storage/dom_storage_context_impl_new.cc

 // Copyright (c) 2011 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 "content/browser/in_process_webkit/dom_storage_context_impl.h"
+#include "content/browser/dom_storage/dom_storage_context_impl_new.h"
 
-#include <algorithm>
+#ifdef ENABLE_NEW_DOM_STORAGE_BACKEND
 
 #include "base/bind.h"
-#include "base/file_path.h"
-#include "base/file_util.h"
-#include "base/string_util.h"
-#include "content/browser/in_process_webkit/dom_storage_area.h"
-#include "content/browser/in_process_webkit/dom_storage_namespace.h"
-#include "content/common/dom_storage_common.h"
+#include "base/bind_helpers.h"
+#include "base/message_loop_proxy.h"
 #include "content/public/browser/browser_thread.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "webkit/database/database_util.h"
+#include "webkit/dom_storage/dom_storage_area.h"
+#include "webkit/dom_storage/dom_storage_context.h"
+#include "webkit/dom_storage/dom_storage_task_runner.h"
 #include "webkit/glue/webkit_glue.h"
-#include "webkit/quota/special_storage_policy.h"
 
 using content::BrowserThread;
 using content::DOMStorageContext;
-using WebKit::WebSecurityOrigin;
-
-const FilePath::CharType DOMStorageContextImpl::kLocalStorageDirectory[] =
-    FILE_PATH_LITERAL("Local Storage");
-
-const FilePath::CharType DOMStorageContextImpl::kLocalStorageExtension[] =
-    FILE_PATH_LITERAL(".localstorage");
+using dom_storage::DomStorageArea;
+using dom_storage::DomStorageContext;
+using dom_storage::DomStorageWorkerPoolTaskRunner;
+using webkit_database::DatabaseUtil;
 
 namespace {
 
-void ClearLocalState(const FilePath& domstorage_path,
-                     quota::SpecialStoragePolicy* special_storage_policy,
-                     bool clear_all_databases) {
-  file_util::FileEnumerator file_enumerator(
-      domstorage_path, false, file_util::FileEnumerator::FILES);
-  for (FilePath file_path = file_enumerator.Next(); !file_path.empty();
-       file_path = file_enumerator.Next()) {
-    if (file_path.Extension() ==
-            DOMStorageContextImpl::kLocalStorageExtension) {
-      GURL origin(WebSecurityOrigin::createFromDatabaseIdentifier(
-          webkit_glue::FilePathToWebString(file_path.BaseName())).toString());
-      if (special_storage_policy &&
-          special_storage_policy->IsStorageProtected(origin))
-        continue;
-      if (!clear_all_databases &&
-          !special_storage_policy->IsStorageSessionOnly(origin)) {
-        continue;
-      }
-      file_util::Delete(file_path, false);
-    }
-  }
+const char kLocalStorageDirectory[] = "Local Storage";
+
+// TODO(michaeln): Fix the content layer api, FilePaths and
+// string16 origin_ids are just wrong. Then get rid of
+// this conversion non-sense. Most of the includes are just
+// to support that non-sense.
+
+GURL OriginIdToGURL(const string16& origin_id) {
+  return DatabaseUtil::GetOriginFromIdentifier(origin_id);
 }
 
-}  // namespace
+FilePath OriginToFullFilePath(const FilePath& directory,
+                              const GURL& origin) {
+  return directory.Append(DomStorageArea::DatabaseFileNameFromOrigin(origin));
+}
+
+GURL FilePathToOrigin(const FilePath& path) {
+  DCHECK(path.MatchesExtension(DomStorageArea::kDatabaseFileExtension));
+  return OriginIdToGURL(
+      webkit_glue::FilePathToWebString(path.BaseName().RemoveExtension()));
+}
+
+void InvokeAllStorageFilesCallbackHelper(
+      const DOMStorageContext::GetAllStorageFilesCallback& callback,
+      const std::vector<FilePath>& file_paths) {
+  callback.Run(file_paths);
+}
+
+void GetAllStorageFilesHelper(
+      base::MessageLoopProxy* reply_loop,
+      DomStorageContext* context,
+      const DOMStorageContext::GetAllStorageFilesCallback& callback) {
+  std::vector<DomStorageContext::UsageInfo> infos;
+  context->GetUsageInfo(&infos);
+
+  std::vector<FilePath> paths;
+  for (size_t i = 0; i < infos.size(); ++i) {
+    paths.push_back(
+        OriginToFullFilePath(context->directory(), infos[i].origin));
+  }
+
+  reply_loop->PostTask(
+      FROM_HERE,
+      base::Bind(&InvokeAllStorageFilesCallbackHelper,
+                 callback, paths));
+}
+
+}
 
 DOMStorageContextImpl::DOMStorageContextImpl(
     const FilePath& data_path,
-    quota::SpecialStoragePolicy* special_storage_policy)
-    : last_storage_area_id_(0),
-      last_session_storage_namespace_id_on_ui_thread_(kLocalStorageNamespaceId),
-      last_session_storage_namespace_id_on_io_thread_(kLocalStorageNamespaceId),
-      clear_local_state_on_exit_(false),
-      save_session_state_(false),
-      special_storage_policy_(special_storage_policy),
-      webkit_message_loop_(
-          BrowserThread::GetMessageLoopProxyForThread(
-              BrowserThread::WEBKIT_DEPRECATED)) {
-  data_path_ = data_path;
+    quota::SpecialStoragePolicy* special_storage_policy) {
+  base::SequencedWorkerPool* worker_pool = BrowserThread::GetBlockingPool();
+  context_ = new dom_storage::DomStorageContext(
+      data_path.empty() ?
+          data_path : data_path.AppendASCII(kLocalStorageDirectory),
+      special_storage_policy,
+      new DomStorageWorkerPoolTaskRunner(
+          worker_pool,
+          worker_pool->GetNamedSequenceToken("dom_storage"),
+          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)));
 }
 
 DOMStorageContextImpl::~DOMStorageContextImpl() {
-  // This should not go away until all DOM Storage message filters have gone
-  // away.  And they remove themselves from this list.
-  DCHECK(message_filter_set_.empty());
-
-  for (StorageNamespaceMap::iterator iter(storage_namespace_map_.begin());
-       iter != storage_namespace_map_.end(); ++iter) {
-    delete iter->second;
-  }
-
-  if (save_session_state_)
-    return;
-
-  bool has_session_only_databases =
-      special_storage_policy_.get() &&
-      special_storage_policy_->HasSessionOnlyOrigins();
-
-  // Clearning only session-only databases, and there are none.
-  if (!clear_local_state_on_exit_ && !has_session_only_databases)
-    return;
-
-  // Not being on the WEBKIT thread here means we are running in a unit test
-  // where no clean up is needed.
-  if (BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED)) {
-    ClearLocalState(data_path_.Append(kLocalStorageDirectory),
-                    special_storage_policy_,
-                    clear_local_state_on_exit_);
-  }
 }
 
-int64 DOMStorageContextImpl::AllocateStorageAreaId() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  return ++last_storage_area_id_;
+void DOMStorageContextImpl::GetAllStorageFiles(
+      const GetAllStorageFilesCallback& callback) {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&GetAllStorageFilesHelper,
+                 base::MessageLoopProxy::current(),
+                 context_, callback));
 }
 
-int64 DOMStorageContextImpl::AllocateSessionStorageNamespaceId() {
-  if (BrowserThread::CurrentlyOn(BrowserThread::UI))
-    return ++last_session_storage_namespace_id_on_ui_thread_;
-  return --last_session_storage_namespace_id_on_io_thread_;
+FilePath DOMStorageContextImpl::GetFilePath(const string16& origin_id) const {
+  DCHECK(context_);
+  return OriginToFullFilePath(context_->directory(), OriginIdToGURL(origin_id));
 }
 
-int64 DOMStorageContextImpl::CloneSessionStorage(int64 original_id) {
-  DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  int64 clone_id = AllocateSessionStorageNamespaceId();
-  BrowserThread::PostTask(
-      BrowserThread::WEBKIT_DEPRECATED, FROM_HERE,
-      base::Bind(&DOMStorageContextImpl::CompleteCloningSessionStorage,
-                 this, original_id, clone_id));
+void DOMStorageContextImpl::DeleteForOrigin(const string16& origin_id) {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::DeleteOrigin, context_,
+                 OriginIdToGURL(origin_id)));
+}
+
+void DOMStorageContextImpl::DeleteLocalStorageFile(const FilePath& file_path) {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::DeleteOrigin, context_,
+                 FilePathToOrigin(file_path)));
+}
+
+void DOMStorageContextImpl::DeleteDataModifiedSince(const base::Time& cutoff) {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::DeleteDataModifiedSince, context_,
+                 cutoff));
+}
+
+void DOMStorageContextImpl::PurgeMemory() {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::PurgeMemory, context_));
+}
+
+void DOMStorageContextImpl::SetClearLocalState(bool clear_local_state) {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::SetClearLocalState, context_,
+                 clear_local_state));
+}
+
+void DOMStorageContextImpl::SaveSessionState() {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::SaveSessionState, context_));
+}
+
+void DOMStorageContextImpl::Shutdown() {
+  DCHECK(context_);
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::Shutdown, context_));
+}
+
+int64 DOMStorageContextImpl::LeakyCloneSessionStorage(
+    int64 existing_namespace_id) {
+  DCHECK(context_);
+  int64 clone_id = context_->AllocateSessionId();
+  context_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&DomStorageContext::CloneSessionNamespace, context_,
+                 existing_namespace_id, clone_id));
   return clone_id;
 }
 
-void DOMStorageContextImpl::RegisterStorageArea(DOMStorageArea* storage_area) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  int64 id = storage_area->id();
-  DCHECK(!GetStorageArea(id));
-  storage_area_map_[id] = storage_area;
-}
-
-void DOMStorageContextImpl::UnregisterStorageArea(
-    DOMStorageArea* storage_area) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  int64 id = storage_area->id();
-  DCHECK(GetStorageArea(id));
-  storage_area_map_.erase(id);
-}
-
-DOMStorageArea* DOMStorageContextImpl::GetStorageArea(int64 id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  StorageAreaMap::iterator iter = storage_area_map_.find(id);
-  if (iter == storage_area_map_.end())
-    return NULL;
-  return iter->second;
-}
-
-void DOMStorageContextImpl::DeleteSessionStorageNamespace(int64 namespace_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED) ||
-         !BrowserThread::IsMessageLoopValid(BrowserThread::WEBKIT_DEPRECATED));
-  StorageNamespaceMap::iterator iter =
-      storage_namespace_map_.find(namespace_id);
-  if (iter == storage_namespace_map_.end())
-    return;
-  DCHECK(iter->second->dom_storage_type() == DOM_STORAGE_SESSION);
-  delete iter->second;
-  storage_namespace_map_.erase(iter);
-}
-
-DOMStorageNamespace* DOMStorageContextImpl::GetStorageNamespace(
-    int64 id, bool allocation_allowed) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  StorageNamespaceMap::iterator iter = storage_namespace_map_.find(id);
-  if (iter != storage_namespace_map_.end())
-    return iter->second;
-  if (!allocation_allowed)
-    return NULL;
-  if (id == kLocalStorageNamespaceId)
-    return CreateLocalStorage();
-  return CreateSessionStorage(id);
-}
-
-void DOMStorageContextImpl::RegisterMessageFilter(
-    DOMStorageMessageFilter* message_filter) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DCHECK(message_filter_set_.find(message_filter) ==
-         message_filter_set_.end());
-  message_filter_set_.insert(message_filter);
-}
-
-void DOMStorageContextImpl::UnregisterMessageFilter(
-    DOMStorageMessageFilter* message_filter) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DCHECK(message_filter_set_.find(message_filter) !=
-         message_filter_set_.end());
-  message_filter_set_.erase(message_filter);
-}
-
-const DOMStorageContextImpl::MessageFilterSet*
-DOMStorageContextImpl::GetMessageFilterSet() const {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  return &message_filter_set_;
-}
-
-void DOMStorageContextImpl::PurgeMemory() {
-  // It is only safe to purge the memory from the LocalStorage namespace,
-  // because it is backed by disk and can be reloaded later.  If we purge a
-  // SessionStorage namespace, its data will be gone forever, because it isn't
-  // currently backed by disk.
-  DOMStorageNamespace* local_storage =
-      GetStorageNamespace(kLocalStorageNamespaceId, false);
-  if (local_storage)
-    local_storage->PurgeMemory();
-}
-
-void DOMStorageContextImpl::DeleteDataModifiedSince(const base::Time& cutoff) {
-  // Make sure that we don't delete a database that's currently being accessed
-  // by unloading all of the databases temporarily.
-  PurgeMemory();
-
-  file_util::FileEnumerator file_enumerator(
-      data_path_.Append(kLocalStorageDirectory), false,
-      file_util::FileEnumerator::FILES);
-  for (FilePath path = file_enumerator.Next(); !path.value().empty();
-       path = file_enumerator.Next()) {
-    GURL origin(WebSecurityOrigin::createFromDatabaseIdentifier(
-        webkit_glue::FilePathToWebString(path.BaseName())).toString());
-    if (special_storage_policy_->IsStorageProtected(origin))
-      continue;
-
-    file_util::FileEnumerator::FindInfo find_info;
-    file_enumerator.GetFindInfo(&find_info);
-    if (file_util::HasFileBeenModifiedSince(find_info, cutoff))
-      file_util::Delete(path, false);
-  }
-}
-
-void DOMStorageContextImpl::DeleteLocalStorageFile(const FilePath& file_path) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-
-  // Make sure that we don't delete a database that's currently being accessed
-  // by unloading all of the databases temporarily.
-  // TODO(bulach): both this method and DeleteDataModifiedSince could purge
-  // only the memory used by the specific file instead of all memory at once.
-  // See http://crbug.com/32000
-  PurgeMemory();
-  file_util::Delete(file_path, false);
-}
-
-void DOMStorageContextImpl::DeleteForOrigin(const string16& origin_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  DeleteLocalStorageFile(GetFilePath(origin_id));
-}
-
-void DOMStorageContextImpl::DeleteAllLocalStorageFiles() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-
-  // Make sure that we don't delete a database that's currently being accessed
-  // by unloading all of the databases temporarily.
-  PurgeMemory();
-
-  file_util::FileEnumerator file_enumerator(
-      data_path_.Append(kLocalStorageDirectory), false,
-      file_util::FileEnumerator::FILES);
-  for (FilePath file_path = file_enumerator.Next(); !file_path.empty();
-       file_path = file_enumerator.Next()) {
-    if (file_path.Extension() == kLocalStorageExtension)
-      file_util::Delete(file_path, false);
-  }
-}
-
-DOMStorageNamespace* DOMStorageContextImpl::CreateLocalStorage() {
-  FilePath dir_path;
-  if (!data_path_.empty())
-    dir_path = data_path_.Append(kLocalStorageDirectory);
-  DOMStorageNamespace* new_namespace =
-      DOMStorageNamespace::CreateLocalStorageNamespace(this, dir_path);
-  RegisterStorageNamespace(new_namespace);
-  return new_namespace;
-}
-
-DOMStorageNamespace* DOMStorageContextImpl::CreateSessionStorage(
-    int64 namespace_id) {
-  DOMStorageNamespace* new_namespace =
-      DOMStorageNamespace::CreateSessionStorageNamespace(this, namespace_id);
-  RegisterStorageNamespace(new_namespace);
-  return new_namespace;
-}
-
-void DOMStorageContextImpl::RegisterStorageNamespace(
-    DOMStorageNamespace* storage_namespace) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  int64 id = storage_namespace->id();
-  DCHECK(!GetStorageNamespace(id, false));
-  storage_namespace_map_[id] = storage_namespace;
-}
-
-void DOMStorageContextImpl::CompleteCloningSessionStorage(
-    int64 existing_id, int64 clone_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
-  DOMStorageNamespace* existing_namespace =
-      GetStorageNamespace(existing_id, false);
-  // If nothing exists, then there's nothing to clone.
-  if (existing_namespace)
-    RegisterStorageNamespace(existing_namespace->Copy(clone_id));
-}
-
-base::SequencedTaskRunner* DOMStorageContextImpl::task_runner() const {
-  return webkit_message_loop_;
-}
-
-std::vector<FilePath> DOMStorageContextImpl::GetAllStorageFiles() {
-  std::vector<FilePath> files;
-  file_util::FileEnumerator file_enumerator(
-      data_path_.Append(kLocalStorageDirectory), false,
-      file_util::FileEnumerator::FILES);
-  for (FilePath file_path = file_enumerator.Next(); !file_path.empty();
-       file_path = file_enumerator.Next()) {
-    if (file_path.Extension() == kLocalStorageExtension)
-      files.push_back(file_path);
-  }
-  return files;
-}
-
-FilePath DOMStorageContextImpl::GetFilePath(const string16& origin_id) const {
-  FilePath storage_dir = data_path_.Append(kLocalStorageDirectory);
-  FilePath::StringType id = webkit_glue::WebStringToFilePathString(origin_id);
-  return storage_dir.Append(id.append(kLocalStorageExtension));
-}
+#endif  // ENABLE_NEW_DOM_STORAGE_BACKEND