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// Copyright 2014 The Chromium Authors
// 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/functional/bind.h"
#include "base/location.h"
#include "base/observer_list.h"
#include "components/value_store/value_store_factory.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/extension_file_task_runner.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_id.h"
namespace {
std::string GetFullKey(const extensions::ExtensionId& 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::OnceClosure 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::OnceClosure> pending_tasks_;
};
void StateStore::DelayedTaskQueue::InvokeWhenReady(base::OnceClosure task) {
if (ready_) {
std::move(task).Run();
} else {
pending_tasks_.push_back(std::move(task));
}
}
void StateStore::DelayedTaskQueue::SetReady() {
ready_ = true;
for (base::OnceClosure& task : pending_tasks_)
std::move(task).Run();
pending_tasks_.clear();
}
StateStore::StateStore(
content::BrowserContext* context,
const scoped_refptr<value_store::ValueStoreFactory>& store_factory,
BackendType backend_type,
bool deferred_load)
: task_queue_(std::make_unique<DelayedTaskQueue>()) {
switch (backend_type) {
case BackendType::RULES:
store_ = std::make_unique<value_store::ValueStoreFrontend>(
store_factory, base::FilePath(kRulesStoreName),
kRulesDatabaseUMAClientName, content::GetUIThreadTaskRunner({}),
GetExtensionFileTaskRunner());
break;
case BackendType::STATE:
store_ = std::make_unique<value_store::ValueStoreFrontend>(
store_factory, base::FilePath(kStateStoreName),
kStateDatabaseUMAClientName, content::GetUIThreadTaskRunner({}),
GetExtensionFileTaskRunner());
break;
case BackendType::SCRIPTS:
store_ = std::make_unique<value_store::ValueStoreFrontend>(
store_factory, base::FilePath(kScriptsStoreName),
kScriptsDatabaseUMAClientName, content::GetUIThreadTaskRunner({}),
GetExtensionFileTaskRunner());
break;
}
extension_registry_observation_.Observe(ExtensionRegistry::Get(context));
if (deferred_load) {
// Call `Init()` asynchronously with a low priority to not delay startup.
content::GetUIThreadTaskRunner({base::TaskPriority::USER_VISIBLE})
->PostTask(FROM_HERE, base::BindOnce(&StateStore::Init,
weak_ptr_factory_.GetWeakPtr()));
} else {
Init();
}
}
StateStore::~StateStore() {
}
void StateStore::RegisterKey(const std::string& key) {
registered_keys_.insert(key);
}
void StateStore::GetExtensionValue(const ExtensionId& extension_id,
const std::string& key,
ReadCallback callback) {
task_queue_->InvokeWhenReady(base::BindOnce(
&value_store::ValueStoreFrontend::Get, base::Unretained(store_.get()),
GetFullKey(extension_id, key), std::move(callback)));
}
void StateStore::SetExtensionValue(const ExtensionId& extension_id,
const std::string& key,
base::Value value) {
for (TestObserver& observer : observers_)
observer.WillSetExtensionValue(extension_id, key);
task_queue_->InvokeWhenReady(base::BindOnce(
&value_store::ValueStoreFrontend::Set, base::Unretained(store_.get()),
GetFullKey(extension_id, key), std::move(value)));
}
void StateStore::RemoveExtensionValue(const ExtensionId& extension_id,
const std::string& key) {
task_queue_->InvokeWhenReady(base::BindOnce(
&value_store::ValueStoreFrontend::Remove, base::Unretained(store_.get()),
GetFullKey(extension_id, key)));
}
void StateStore::AddObserver(TestObserver* observer) {
observers_.AddObserver(observer);
}
void StateStore::RemoveObserver(TestObserver* observer) {
observers_.RemoveObserver(observer);
}
void StateStore::FlushForTesting(base::OnceClosure flushed_callback) {
// Look up a key in the database. This serves as a roundtrip to the DB and
// back; the value of the key doesn't matter.
GetExtensionValue("fake_id", "fake_key",
base::BindOnce(
[](base::OnceClosure flushed_callback,
std::optional<base::Value> ignored) {
std::move(flushed_callback).Run();
},
std::move(flushed_callback)));
}
bool StateStore::IsInitialized() const {
return task_queue_->ready();
}
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() {
// 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::RemoveKeysForExtension(const ExtensionId& extension_id) {
for (auto key = registered_keys_.begin(); key != registered_keys_.end();
++key) {
task_queue_->InvokeWhenReady(base::BindOnce(
&value_store::ValueStoreFrontend::Remove,
base::Unretained(store_.get()), GetFullKey(extension_id, *key)));
}
}
} // namespace extensions
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