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// Copyright 2016 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/renderer/dom_storage/local_storage_cached_areas.h"
#include "base/metrics/histogram_macros.h"
#include "base/sys_info.h"
#include "content/common/dom_storage/dom_storage_namespace_ids.h"
#include "content/common/dom_storage/dom_storage_types.h"
#include "content/public/common/content_features.h"
#include "content/renderer/dom_storage/local_storage_cached_area.h"
#include "content/renderer/render_thread_impl.h"
namespace content {
namespace {
const size_t kTotalCacheLimitInBytesLowEnd = 1 * 1024 * 1024;
const size_t kTotalCacheLimitInBytes = 5 * 1024 * 1024;
// An empty namespace is the local storage namespace.
constexpr const char kLocalStorageNamespaceId[] = "";
} // namespace
LocalStorageCachedAreas::LocalStorageCachedAreas(
mojom::StoragePartitionService* storage_partition_service,
blink::scheduler::WebMainThreadScheduler* main_thread_scheduler)
: storage_partition_service_(storage_partition_service),
total_cache_limit_(base::SysInfo::IsLowEndDevice()
? kTotalCacheLimitInBytesLowEnd
: kTotalCacheLimitInBytes),
main_thread_scheduler_(main_thread_scheduler) {}
LocalStorageCachedAreas::~LocalStorageCachedAreas() {}
scoped_refptr<LocalStorageCachedArea> LocalStorageCachedAreas::GetCachedArea(
const url::Origin& origin) {
return GetCachedArea(kLocalStorageNamespaceId, origin,
main_thread_scheduler_);
}
scoped_refptr<LocalStorageCachedArea>
LocalStorageCachedAreas::GetSessionStorageArea(const std::string& namespace_id,
const url::Origin& origin) {
DCHECK_NE(kLocalStorageNamespaceId, namespace_id);
return GetCachedArea(namespace_id, origin, main_thread_scheduler_);
}
void LocalStorageCachedAreas::CloneNamespace(
const std::string& source_namespace,
const std::string& destination_namespace) {
DCHECK(base::FeatureList::IsEnabled(features::kMojoSessionStorage));
DCHECK_EQ(kSessionStorageNamespaceIdLength, source_namespace.size());
DCHECK_EQ(kSessionStorageNamespaceIdLength, destination_namespace.size());
auto namespace_it = cached_namespaces_.find(source_namespace);
if (namespace_it == cached_namespaces_.end()) {
namespace_it =
cached_namespaces_
.emplace(std::make_pair(source_namespace, DOMStorageNamespace()))
.first;
storage_partition_service_->OpenSessionStorage(
source_namespace,
mojo::MakeRequest(&namespace_it->second.session_storage_namespace));
}
DCHECK(namespace_it->second.session_storage_namespace);
namespace_it->second.session_storage_namespace->Clone(destination_namespace);
}
size_t LocalStorageCachedAreas::TotalCacheSize() const {
size_t total = 0;
for (const auto& it : cached_namespaces_)
total += it.second.TotalCacheSize();
return total;
}
void LocalStorageCachedAreas::ClearAreasIfNeeded() {
if (TotalCacheSize() < total_cache_limit_)
return;
base::EraseIf(cached_namespaces_,
[](auto& pair) { return pair.second.CleanUpUnusedAreas(); });
}
scoped_refptr<LocalStorageCachedArea> LocalStorageCachedAreas::GetCachedArea(
const std::string& namespace_id,
const url::Origin& origin,
blink::scheduler::WebMainThreadScheduler* scheduler) {
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class CacheMetrics {
kMiss = 0, // Area not in cache.
kHit = 1, // Area with refcount = 0 loaded from cache.
kUnused = 2, // Cache was not used. Area had refcount > 0.
kMaxValue = kUnused,
};
auto namespace_it = cached_namespaces_.find(namespace_id);
CacheMetrics metric;
scoped_refptr<LocalStorageCachedArea> result;
DOMStorageNamespace* dom_namespace = nullptr;
if (namespace_it == cached_namespaces_.end()) {
metric = CacheMetrics::kMiss;
} else {
dom_namespace = &namespace_it->second;
auto cache_it = dom_namespace->cached_areas.find(origin);
if (cache_it == dom_namespace->cached_areas.end()) {
metric = CacheMetrics::kMiss;
} else {
if (cache_it->second->HasOneRef()) {
metric = CacheMetrics::kHit;
} else {
metric = CacheMetrics::kUnused;
}
result = cache_it->second;
}
}
if (namespace_id == kLocalStorageNamespaceId)
UMA_HISTOGRAM_ENUMERATION("LocalStorage.RendererAreaCacheHit", metric);
else
LOCAL_HISTOGRAM_ENUMERATION("SessionStorage.RendererAreaCacheHit", metric);
if (!result) {
ClearAreasIfNeeded();
if (!dom_namespace) {
dom_namespace = &cached_namespaces_[namespace_id];
}
if (namespace_id == kLocalStorageNamespaceId) {
result = base::MakeRefCounted<LocalStorageCachedArea>(
origin, storage_partition_service_, this, scheduler);
} else {
DCHECK(base::FeatureList::IsEnabled(features::kMojoSessionStorage));
if (!dom_namespace->session_storage_namespace) {
storage_partition_service_->OpenSessionStorage(
namespace_id,
mojo::MakeRequest(&dom_namespace->session_storage_namespace));
}
result = base::MakeRefCounted<LocalStorageCachedArea>(
namespace_id, origin, dom_namespace->session_storage_namespace.get(),
this, scheduler);
}
dom_namespace->cached_areas.emplace(origin, result);
}
return result;
}
LocalStorageCachedAreas::DOMStorageNamespace::DOMStorageNamespace() {}
LocalStorageCachedAreas::DOMStorageNamespace::~DOMStorageNamespace() {}
LocalStorageCachedAreas::DOMStorageNamespace::DOMStorageNamespace(
LocalStorageCachedAreas::DOMStorageNamespace&& other) = default;
size_t LocalStorageCachedAreas::DOMStorageNamespace::TotalCacheSize() const {
size_t total = 0;
for (const auto& it : cached_areas)
total += it.second.get()->memory_used();
return total;
}
bool LocalStorageCachedAreas::DOMStorageNamespace::CleanUpUnusedAreas() {
base::EraseIf(cached_areas,
[](auto& pair) { return pair.second->HasOneRef(); });
return cached_areas.empty();
}
} // namespace content
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