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// Copyright 2013 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 "chrome/browser/extensions/api/system_info/system_info_api.h"
#include <set>
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/api/system_storage/storage_info_provider.h"
#include "chrome/browser/extensions/event_router_forwarder.h"
#include "chrome/common/extensions/api/system_display.h"
#include "chrome/common/extensions/api/system_storage.h"
#include "components/storage_monitor/removable_storage_observer.h"
#include "components/storage_monitor/storage_info.h"
#include "components/storage_monitor/storage_monitor.h"
#include "content/public/browser/browser_thread.h"
#include "ui/gfx/display_observer.h"
#if defined(OS_CHROMEOS)
#include "ash/shell.h"
#include "ui/gfx/screen.h"
#endif
namespace extensions {
using api::system_storage::StorageUnitInfo;
using content::BrowserThread;
using storage_monitor::StorageMonitor;
namespace system_display = api::system_display;
namespace system_storage = api::system_storage;
namespace {
#if defined(OS_CHROMEOS)
bool IsDisplayChangedEvent(const std::string& event_name) {
return event_name == system_display::OnDisplayChanged::kEventName;
}
#endif
bool IsSystemStorageEvent(const std::string& event_name) {
return (event_name == system_storage::OnAttached::kEventName ||
event_name == system_storage::OnDetached::kEventName);
}
// Event router for systemInfo API. It is a singleton instance shared by
// multiple profiles.
class SystemInfoEventRouter : public gfx::DisplayObserver,
public storage_monitor::RemovableStorageObserver {
public:
static SystemInfoEventRouter* GetInstance();
SystemInfoEventRouter();
virtual ~SystemInfoEventRouter();
// Add/remove event listener for the |event_name| event.
void AddEventListener(const std::string& event_name);
void RemoveEventListener(const std::string& event_name);
private:
// gfx::DisplayObserver:
virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
// RemovableStorageObserver implementation.
virtual void OnRemovableStorageAttached(
const storage_monitor::StorageInfo& info) OVERRIDE;
virtual void OnRemovableStorageDetached(
const storage_monitor::StorageInfo& info) OVERRIDE;
// Called from any thread to dispatch the systemInfo event to all extension
// processes cross multiple profiles.
void DispatchEvent(const std::string& event_name,
scoped_ptr<base::ListValue> args);
// Called to dispatch the systemInfo.display.onDisplayChanged event.
void OnDisplayChanged();
// Used to record the event names being watched.
std::multiset<std::string> watching_event_set_;
bool has_storage_monitor_observer_;
DISALLOW_COPY_AND_ASSIGN(SystemInfoEventRouter);
};
static base::LazyInstance<SystemInfoEventRouter>::Leaky
g_system_info_event_router = LAZY_INSTANCE_INITIALIZER;
// static
SystemInfoEventRouter* SystemInfoEventRouter::GetInstance() {
return g_system_info_event_router.Pointer();
}
SystemInfoEventRouter::SystemInfoEventRouter()
: has_storage_monitor_observer_(false) {
}
SystemInfoEventRouter::~SystemInfoEventRouter() {
if (has_storage_monitor_observer_) {
StorageMonitor* storage_monitor = StorageMonitor::GetInstance();
if (storage_monitor)
storage_monitor->RemoveObserver(this);
}
}
void SystemInfoEventRouter::AddEventListener(const std::string& event_name) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
watching_event_set_.insert(event_name);
if (watching_event_set_.count(event_name) > 1)
return;
// For system.display event.
#if defined(OS_CHROMEOS)
if (IsDisplayChangedEvent(event_name))
ash::Shell::GetScreen()->AddObserver(this);
#endif
if (IsSystemStorageEvent(event_name)) {
if (!has_storage_monitor_observer_) {
has_storage_monitor_observer_ = true;
DCHECK(StorageMonitor::GetInstance()->IsInitialized());
StorageMonitor::GetInstance()->AddObserver(this);
}
}
}
void SystemInfoEventRouter::RemoveEventListener(const std::string& event_name) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
std::multiset<std::string>::iterator it =
watching_event_set_.find(event_name);
if (it != watching_event_set_.end()) {
watching_event_set_.erase(it);
if (watching_event_set_.count(event_name) > 0)
return;
}
#if defined(OS_CHROMEOS)
if (IsDisplayChangedEvent(event_name))
ash::Shell::GetScreen()->RemoveObserver(this);
#endif
if (IsSystemStorageEvent(event_name)) {
const std::string& other_event_name =
(event_name == system_storage::OnDetached::kEventName) ?
system_storage::OnAttached::kEventName :
system_storage::OnDetached::kEventName;
if (watching_event_set_.count(other_event_name) == 0) {
StorageMonitor::GetInstance()->RemoveObserver(this);
has_storage_monitor_observer_ = false;
}
}
}
void SystemInfoEventRouter::OnRemovableStorageAttached(
const storage_monitor::StorageInfo& info) {
StorageUnitInfo unit;
systeminfo::BuildStorageUnitInfo(info, &unit);
scoped_ptr<base::ListValue> args(new base::ListValue);
args->Append(unit.ToValue().release());
DispatchEvent(system_storage::OnAttached::kEventName, args.Pass());
}
void SystemInfoEventRouter::OnRemovableStorageDetached(
const storage_monitor::StorageInfo& info) {
scoped_ptr<base::ListValue> args(new base::ListValue);
std::string transient_id =
StorageMonitor::GetInstance()->GetTransientIdForDeviceId(
info.device_id());
args->AppendString(transient_id);
DispatchEvent(system_storage::OnDetached::kEventName, args.Pass());
}
void SystemInfoEventRouter::OnDisplayBoundsChanged(
const gfx::Display& display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayAdded(const gfx::Display& new_display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayRemoved(const gfx::Display& old_display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayChanged() {
scoped_ptr<base::ListValue> args(new base::ListValue());
DispatchEvent(system_display::OnDisplayChanged::kEventName, args.Pass());
}
void SystemInfoEventRouter::DispatchEvent(const std::string& event_name,
scoped_ptr<base::ListValue> args) {
g_browser_process->extension_event_router_forwarder()->
BroadcastEventToRenderers(event_name, args.Pass(), GURL());
}
void AddEventListener(const std::string& event_name) {
SystemInfoEventRouter::GetInstance()->AddEventListener(event_name);
}
void RemoveEventListener(const std::string& event_name) {
SystemInfoEventRouter::GetInstance()->RemoveEventListener(event_name);
}
} // namespace
static base::LazyInstance<BrowserContextKeyedAPIFactory<SystemInfoAPI> >
g_factory = LAZY_INSTANCE_INITIALIZER;
// static
BrowserContextKeyedAPIFactory<SystemInfoAPI>*
SystemInfoAPI::GetFactoryInstance() {
return g_factory.Pointer();
}
SystemInfoAPI::SystemInfoAPI(content::BrowserContext* context)
: browser_context_(context) {
EventRouter* router = EventRouter::Get(browser_context_);
router->RegisterObserver(this, system_storage::OnAttached::kEventName);
router->RegisterObserver(this, system_storage::OnDetached::kEventName);
router->RegisterObserver(this, system_display::OnDisplayChanged::kEventName);
}
SystemInfoAPI::~SystemInfoAPI() {
}
void SystemInfoAPI::Shutdown() {
EventRouter::Get(browser_context_)->UnregisterObserver(this);
}
void SystemInfoAPI::OnListenerAdded(const EventListenerInfo& details) {
if (IsSystemStorageEvent(details.event_name)) {
StorageMonitor::GetInstance()->EnsureInitialized(
base::Bind(&AddEventListener, details.event_name));
} else {
AddEventListener(details.event_name);
}
}
void SystemInfoAPI::OnListenerRemoved(const EventListenerInfo& details) {
if (IsSystemStorageEvent(details.event_name)) {
StorageMonitor::GetInstance()->EnsureInitialized(
base::Bind(&RemoveEventListener, details.event_name));
} else {
RemoveEventListener(details.event_name);
}
}
} // namespace extensions
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