DomStorage data deletion and memory purging.

webkit/dom_storage/dom_storage_context.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 "webkit/dom_storage/dom_storage_context.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/time.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "webkit/dom_storage/dom_storage_area.h"
 #include "webkit/dom_storage/dom_storage_namespace.h"
 #include "webkit/dom_storage/dom_storage_task_runner.h"
 #include "webkit/dom_storage/dom_storage_types.h"
-#include "webkit/glue/webkit_glue.h"
 #include "webkit/quota/special_storage_policy.h"
 
 using file_util::FileEnumerator;
 
 namespace dom_storage {
 
-DomStorageContext::UsageInfo::UsageInfo() {}
+DomStorageContext::UsageInfo::UsageInfo() : data_size(0) {}
 DomStorageContext::UsageInfo::~UsageInfo() {}
 
 DomStorageContext::DomStorageContext(
     const FilePath& directory,
     quota::SpecialStoragePolicy* special_storage_policy,
     DomStorageTaskRunner* task_runner)
     : directory_(directory),
       task_runner_(task_runner),
       is_shutdown_(false),
       clear_local_state_(false),
@@ skipping 18 matching lines @@
       DomStorageNamespace* local =
           new DomStorageNamespace(directory_, task_runner_);
       namespaces_[kLocalStorageNamespaceId] = local;
       return local;
     }
     return NULL;
   }
   return found->second;
 }
 
-void DomStorageContext::GetUsageInfo(std::vector<UsageInfo>* infos) {
+void DomStorageContext::GetUsageInfo(std::vector<UsageInfo>* infos,
+                                     bool include_file_info) {
+  if (directory_.empty())
+    return;
   FileEnumerator enumerator(directory_, false, FileEnumerator::FILES);
   for (FilePath path = enumerator.Next(); !path.empty();
        path = enumerator.Next()) {
     if (path.MatchesExtension(DomStorageArea::kDatabaseFileExtension)) {
       UsageInfo info;
-
-      // Extract origin id from the path and construct a GURL.
-      WebKit::WebString origin_id = webkit_glue::FilePathToWebString(
-          path.BaseName().RemoveExtension());
-      info.origin = GURL(WebKit::WebSecurityOrigin::
-          createFromDatabaseIdentifier(origin_id).toString());
-
-      FileEnumerator::FindInfo find_info;
-      enumerator.GetFindInfo(&find_info);
-      info.data_size = FileEnumerator::GetFilesize(find_info);
-      info.last_modified = FileEnumerator::GetLastModifiedTime(find_info);
-
+      info.origin = DomStorageArea::OriginFromDatabaseFileName(path);
+      if (include_file_info) {
+        FileEnumerator::FindInfo find_info;
+        enumerator.GetFindInfo(&find_info);
+        info.data_size = FileEnumerator::GetFilesize(find_info);
+        info.last_modified = FileEnumerator::GetLastModifiedTime(find_info);
+      }
       infos->push_back(info);
     }
   }
 }
 
 void DomStorageContext::DeleteOrigin(const GURL& origin) {

[michaeln, 2012/03/21 23:22:02]

fyi: When this DeleteOrigin() method is invoked, no DomStorage events are raised
into connected pages. This matches the behavior of the current impl.

-  // TODO(michaeln): write me
+  DCHECK(!is_shutdown_);
+  DomStorageNamespace* local = GetStorageNamespace(kLocalStorageNamespaceId);
+  local->DeleteOrigin(origin);
 }
 
 void DomStorageContext::DeleteDataModifiedSince(const base::Time& cutoff) {
-  // TODO(michaeln): write me
+  std::vector<UsageInfo> infos;
+  GetUsageInfo(&infos, true);
+  for (size_t i = 0; i < infos.size(); ++i) {
+    if (infos[i].last_modified > cutoff)
+      DeleteOrigin(infos[i].origin);
+  }
 }
 
 void DomStorageContext::PurgeMemory() {
   // We can only purge memory from the local storage namespace
   // which is backed by disk.
   StorageNamespaceMap::iterator found =
       namespaces_.find(kLocalStorageNamespaceId);
   if (found != namespaces_.end())
     found->second->PurgeMemory();
 }
@@ skipping 65 matching lines @@
   DCHECK_NE(kLocalStorageNamespaceId, existing_id);
   DCHECK_NE(kLocalStorageNamespaceId, new_id);
   StorageNamespaceMap::iterator found = namespaces_.find(existing_id);
   if (found != namespaces_.end())
     namespaces_[new_id] = found->second->Clone(new_id);
   else
     CreateSessionNamespace(new_id);
 }
 
 }  // namespace dom_storage