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// Copyright 2014 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 "extensions/browser/state_store.h"
#include <stddef.h>
#include <utility>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/value_store/value_store_factory.h"
#include "extensions/common/extension.h"
namespace {
// Delay, in seconds, before we should open the State Store database. We
// defer it to avoid slowing down startup. See http://crbug.com/161848
const int kInitDelaySeconds = 1;
std::string GetFullKey(const std::string& extension_id,
const std::string& key) {
return extension_id + "." + key;
}
} // namespace
namespace extensions {
// Helper class to delay tasks until we're ready to start executing them.
class StateStore::DelayedTaskQueue {
public:
DelayedTaskQueue() : ready_(false) {}
~DelayedTaskQueue() {}
// Queues up a task for invoking once we're ready. Invokes immediately if
// we're already ready.
void InvokeWhenReady(base::Closure task);
// Marks us ready, and invokes all pending tasks.
void SetReady();
// Return whether or not the DelayedTaskQueue is |ready_|.
bool ready() const { return ready_; }
private:
bool ready_;
std::vector<base::Closure> pending_tasks_;
};
void StateStore::DelayedTaskQueue::InvokeWhenReady(base::Closure task) {
if (ready_) {
task.Run();
} else {
pending_tasks_.push_back(task);
}
}
void StateStore::DelayedTaskQueue::SetReady() {
ready_ = true;
for (size_t i = 0; i < pending_tasks_.size(); ++i)
pending_tasks_[i].Run();
pending_tasks_.clear();
}
StateStore::StateStore(content::BrowserContext* context,
const scoped_refptr<ValueStoreFactory>& store_factory,
ValueStoreFrontend::BackendType backend_type,
bool deferred_load)
: store_(new ValueStoreFrontend(store_factory, backend_type)),
task_queue_(new DelayedTaskQueue()),
extension_registry_observer_(this) {
extension_registry_observer_.Add(ExtensionRegistry::Get(context));
if (deferred_load) {
// Don't Init() until the first page is loaded or the embedder explicitly
// requests it.
registrar_.Add(
this,
content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
content::NotificationService::AllBrowserContextsAndSources());
} else {
Init();
}
}
StateStore::~StateStore() {
}
void StateStore::RequestInitAfterDelay() {
InitAfterDelay();
}
void StateStore::RegisterKey(const std::string& key) {
registered_keys_.insert(key);
}
void StateStore::GetExtensionValue(const std::string& extension_id,
const std::string& key,
ReadCallback callback) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Get, base::Unretained(store_.get()),
GetFullKey(extension_id, key), callback));
}
void StateStore::SetExtensionValue(const std::string& extension_id,
const std::string& key,
scoped_ptr<base::Value> value) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Set, base::Unretained(store_.get()),
GetFullKey(extension_id, key), base::Passed(&value)));
}
void StateStore::RemoveExtensionValue(const std::string& extension_id,
const std::string& key) {
task_queue_->InvokeWhenReady(base::Bind(&ValueStoreFrontend::Remove,
base::Unretained(store_.get()),
GetFullKey(extension_id, key)));
}
bool StateStore::IsInitialized() const {
return task_queue_->ready();
}
void StateStore::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(type, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME);
registrar_.RemoveAll();
InitAfterDelay();
}
void StateStore::OnExtensionWillBeInstalled(
content::BrowserContext* browser_context,
const Extension* extension,
bool is_update,
const std::string& old_name) {
RemoveKeysForExtension(extension->id());
}
void StateStore::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension,
extensions::UninstallReason reason) {
RemoveKeysForExtension(extension->id());
}
void StateStore::Init() {
// Could be called twice if InitAfterDelay() is requested explicitly by the
// embedder in addition to internally after first page load.
if (IsInitialized())
return;
// TODO(cmumford): The store now always lazily initializes upon first access.
// A follow-on CL will remove this deferred initialization implementation
// which is now vestigial.
task_queue_->SetReady();
}
void StateStore::InitAfterDelay() {
if (IsInitialized())
return;
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&StateStore::Init, AsWeakPtr()),
base::TimeDelta::FromSeconds(kInitDelaySeconds));
}
void StateStore::RemoveKeysForExtension(const std::string& extension_id) {
for (std::set<std::string>::iterator key = registered_keys_.begin();
key != registered_keys_.end();
++key) {
task_queue_->InvokeWhenReady(base::Bind(&ValueStoreFrontend::Remove,
base::Unretained(store_.get()),
GetFullKey(extension_id, *key)));
}
}
} // namespace extensions
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