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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 "components/storage_monitor/storage_monitor.h"
#include <memory>
#include <utility>
#include "base/containers/contains.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "components/storage_monitor/removable_storage_observer.h"
#include "components/storage_monitor/transient_device_ids.h"
namespace storage_monitor {
namespace {
StorageMonitor* g_storage_monitor = nullptr;
} // namespace
StorageMonitor::Receiver::~Receiver() = default;
class StorageMonitor::ReceiverImpl : public StorageMonitor::Receiver {
public:
explicit ReceiverImpl(StorageMonitor* notifications)
: notifications_(notifications) {}
~ReceiverImpl() override = default;
void ProcessAttach(const StorageInfo& info) override;
void ProcessDetach(const std::string& id) override;
void MarkInitialized() override;
private:
raw_ptr<StorageMonitor> notifications_;
};
void StorageMonitor::ReceiverImpl::ProcessAttach(const StorageInfo& info) {
notifications_->ProcessAttach(info);
}
void StorageMonitor::ReceiverImpl::ProcessDetach(const std::string& id) {
notifications_->ProcessDetach(id);
}
void StorageMonitor::ReceiverImpl::MarkInitialized() {
notifications_->MarkInitialized();
}
// static
void StorageMonitor::Create() {
delete g_storage_monitor;
g_storage_monitor = CreateInternal();
}
// static
void StorageMonitor::Destroy() {
delete g_storage_monitor;
g_storage_monitor = nullptr;
}
StorageMonitor* StorageMonitor::GetInstance() {
return g_storage_monitor;
}
void StorageMonitor::SetStorageMonitorForTesting(
std::unique_ptr<StorageMonitor> storage_monitor) {
delete g_storage_monitor;
g_storage_monitor = storage_monitor.release();
}
std::vector<StorageInfo> StorageMonitor::GetAllAvailableStorages() const {
std::vector<StorageInfo> results;
base::AutoLock lock(storage_lock_);
for (const auto& item : storage_map_) {
results.push_back(item.second);
}
return results;
}
void StorageMonitor::EnsureInitialized(base::OnceClosure callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (initialized_) {
if (!callback.is_null())
std::move(callback).Run();
return;
}
if (!callback.is_null()) {
on_initialize_callbacks_.push_back(std::move(callback));
}
if (initializing_)
return;
initializing_ = true;
Init();
}
bool StorageMonitor::IsInitialized() const {
return initialized_;
}
void StorageMonitor::AddObserver(RemovableStorageObserver* obs) {
observer_list_->AddObserver(obs);
}
void StorageMonitor::RemoveObserver(
RemovableStorageObserver* obs) {
observer_list_->RemoveObserver(obs);
}
std::string StorageMonitor::GetTransientIdForDeviceId(
const std::string& device_id) {
return transient_device_ids_->GetTransientIdForDeviceId(device_id);
}
std::string StorageMonitor::GetDeviceIdForTransientId(
const std::string& transient_id) const {
return transient_device_ids_->DeviceIdFromTransientId(transient_id);
}
void StorageMonitor::EjectDevice(
const std::string& device_id,
base::OnceCallback<void(EjectStatus)> callback) {
// Platform-specific implementations will override this method to
// perform actual device ejection.
std::move(callback).Run(EJECT_FAILURE);
}
StorageMonitor::StorageMonitor()
: observer_list_(
new base::ObserverListThreadSafe<RemovableStorageObserver>()),
initializing_(false),
initialized_(false),
transient_device_ids_(new TransientDeviceIds) {
receiver_ = std::make_unique<ReceiverImpl>(this);
}
StorageMonitor::~StorageMonitor() = default;
StorageMonitor::Receiver* StorageMonitor::receiver() const {
return receiver_.get();
}
void StorageMonitor::MarkInitialized() {
initialized_ = true;
for (auto& callback : on_initialize_callbacks_)
std::move(callback).Run();
on_initialize_callbacks_.clear();
}
void StorageMonitor::ProcessAttach(const StorageInfo& info) {
{
base::AutoLock lock(storage_lock_);
if (base::Contains(storage_map_, info.device_id())) {
// This can happen if our unique id scheme fails. Ignore the incoming
// non-unique attachment.
return;
}
storage_map_.insert(std::make_pair(info.device_id(), info));
}
DVLOG(1) << "StorageAttached id " << info.device_id();
if (StorageInfo::IsRemovableDevice(info.device_id())) {
observer_list_->Notify(
FROM_HERE, &RemovableStorageObserver::OnRemovableStorageAttached, info);
}
}
void StorageMonitor::ProcessDetach(const std::string& id) {
StorageInfo info;
{
base::AutoLock lock(storage_lock_);
auto it = storage_map_.find(id);
if (it == storage_map_.end())
return;
info = it->second;
storage_map_.erase(it);
}
DVLOG(1) << "StorageDetached for id " << id;
if (StorageInfo::IsRemovableDevice(info.device_id())) {
observer_list_->Notify(
FROM_HERE, &RemovableStorageObserver::OnRemovableStorageDetached, info);
}
}
} // namespace storage_monitor
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