gecko-dev/dom/system/gonk/nsVolumeService.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsVolumeService.h"
#include "Volume.h"
#include "VolumeManager.h"
#include "VolumeServiceIOThread.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsDependentSubstring.h"
#include "nsIDOMWakeLockListener.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIPowerManagerService.h"
#include "nsISupportsUtils.h"
#include "nsIVolume.h"
#include "nsIVolumeService.h"
#include "nsLocalFile.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
#include "nsVolumeMountLock.h"
#include "nsXULAppAPI.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Services.h"
#define VOLUME_MANAGER_LOG_TAG "nsVolumeService"
#include "VolumeManagerLog.h"
#include <stdlib.h>
using namespace mozilla::dom;
using namespace mozilla::services;
namespace mozilla {
namespace system {
NS_IMPL_THREADSAFE_ISUPPORTS2(nsVolumeService,
nsIVolumeService,
nsIDOMMozWakeLockListener)
StaticRefPtr<nsVolumeService> nsVolumeService::sSingleton;
// static
already_AddRefed<nsVolumeService>
nsVolumeService::GetSingleton()
{
MOZ_ASSERT(NS_IsMainThread());
if (!sSingleton) {
sSingleton = new nsVolumeService();
}
NS_ADDREF(sSingleton.get());
return sSingleton.get();
}
// static
void
nsVolumeService::Shutdown()
{
if (!sSingleton || (XRE_GetProcessType() != GeckoProcessType_Default)) {
return;
}
nsCOMPtr<nsIPowerManagerService> pmService =
do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (pmService) {
pmService->RemoveWakeLockListener(sSingleton.get());
}
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(ShutdownVolumeServiceIOThread));
sSingleton = nullptr;
}
nsVolumeService::nsVolumeService()
{
sSingleton = this;
if (XRE_GetProcessType() != GeckoProcessType_Default) {
// We don't support the nsIVolumeService in the child processes,
// but we get constructed due to the way we're registered with
// nsLayoutModule.cpp. So we exit early to reduce our memory
// impact, and so that we don't start unnecessary IOThread stuff.
return;
}
// Startup the IOThread side of things. The actual volume changes
// are captured by the IOThread and forwarded to main thread.
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(InitVolumeServiceIOThread, this));
nsCOMPtr<nsIPowerManagerService> pmService =
do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (!pmService) {
return;
}
pmService->AddWakeLockListener(this);
}
nsVolumeService::~nsVolumeService()
{
}
// Callback for nsIDOMMozWakeLockListener
NS_IMETHODIMP nsVolumeService::Callback(const nsAString& aTopic, const nsAString& aState)
{
CheckMountLock(aTopic, aState);
return NS_OK;
}
NS_IMETHODIMP nsVolumeService::BroadcastVolume(const nsAString& aVolName)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
nsRefPtr<nsVolume> vol = FindVolumeByName(aVolName);
if (!vol) {
ERR("BroadcastVolume: Unable to locate volume '%s'",
NS_LossyConvertUTF16toASCII(aVolName).get());
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIObserverService> obs = GetObserverService();
NS_ENSURE_TRUE(obs, NS_NOINTERFACE);
DBG("nsVolumeService::BroadcastVolume for '%s'", vol->NameStr());
nsString stateStr(NS_ConvertUTF8toUTF16(vol->StateStr()));
obs->NotifyObservers(vol, NS_VOLUME_STATE_CHANGED, stateStr.get());
return NS_OK;
}
NS_IMETHODIMP nsVolumeService::GetVolumeByName(const nsAString& aVolName, nsIVolume **aResult)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
nsRefPtr<nsVolume> vol = FindVolumeByName(aVolName);
if (!vol) {
ERR("GetVolumeByName: Unable to locate volume '%s'",
NS_LossyConvertUTF16toASCII(aVolName).get());
return NS_ERROR_NOT_AVAILABLE;
}
NS_ADDREF(*aResult = vol);
return NS_OK;
}
NS_IMETHODIMP nsVolumeService::GetVolumeByPath(const nsAString& aPath, nsIVolume **aResult)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
nsCString utf8Path = NS_ConvertUTF16toUTF8(aPath);
char realPathBuf[PATH_MAX];
if (!realpath(utf8Path.get(), realPathBuf)) {
ERR("GetVolumeByPath: realpath on '%s' failed: %d", utf8Path.get(), errno);
return NSRESULT_FOR_ERRNO();
}
// The volume mount point is always a directory. Something like /mnt/sdcard
// Once we have a full qualified pathname with symlinks removed (which is
// what realpath does), we basically check if aPath starts with the mount
// point, but we don't want to have /mnt/sdcard match /mnt/sdcardfoo but we
// do want it to match /mnt/sdcard/foo
// So we add a trailing slash to the mount point and the pathname passed in
// prior to doing the comparison.
strlcat(realPathBuf, "/", sizeof(realPathBuf));
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
nsAutoCString volMountPointSlash = NS_ConvertUTF16toUTF8(vol->MountPoint());
volMountPointSlash.Append(NS_LITERAL_CSTRING("/"));
nsDependentCSubstring testStr(realPathBuf, volMountPointSlash.Length());
if (volMountPointSlash.Equals(testStr)) {
NS_ADDREF(*aResult = vol);
return NS_OK;
}
}
// In order to support queries by DeviceStorage and the updater, we will fabricate
// a volume from the pathname, so that the caller can determine the volume size
nsRefPtr<nsVolume> vol = new nsVolume(NS_LITERAL_STRING("fake"),
aPath, nsIVolume::STATE_MOUNTED,
-1 /*generation*/);
NS_ADDREF(*aResult = vol);
return NS_OK;
}
NS_IMETHODIMP nsVolumeService::CreateMountLock(const nsAString& aVolumeName, nsIVolumeMountLock **aResult)
{
nsRefPtr<nsVolumeMountLock> mountLock = nsVolumeMountLock::Create(aVolumeName);
if (!mountLock) {
return NS_ERROR_NOT_AVAILABLE;
}
NS_ADDREF(*aResult = mountLock);
return NS_OK;
}
void nsVolumeService::CheckMountLock(const nsAString& aMountLockName,
const nsAString& aMountLockState)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
nsString mountLockName;
vol->GetMountLockName(mountLockName);
if (mountLockName.Equals(aMountLockName)) {
vol->UpdateMountLock(aMountLockState);
return;
}
}
}
already_AddRefed<nsVolume> nsVolumeService::FindVolumeByName(const nsAString& aName)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
if (vol->Name().Equals(aName)) {
return vol.forget();
}
}
return NULL;
}
//static
already_AddRefed<nsVolume> nsVolumeService::FindAddVolumeByName(const nsAString& aName)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
nsRefPtr<nsVolume> vol;
vol = FindVolumeByName(aName);
if (vol) {
return vol.forget();
}
// Volume not found - add a new one
vol = new nsVolume(aName);
mVolumeArray.AppendElement(vol);
return vol.forget();
}
void nsVolumeService::UpdateVolume(const nsVolume* aVolume)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
nsRefPtr<nsVolume> vol = FindAddVolumeByName(aVolume->Name());
if (vol->Equals(aVolume)) {
// Nothing has really changed. Don't bother telling anybody.
return;
}
vol->Set(aVolume);
nsCOMPtr<nsIObserverService> obs = GetObserverService();
if (!obs) {
return;
}
nsString stateStr(NS_ConvertUTF8toUTF16(vol->StateStr()));
obs->NotifyObservers(vol, NS_VOLUME_STATE_CHANGED, stateStr.get());
}
/***************************************************************************
* The UpdateVolumeRunnable creates an nsVolume and updates the main thread
* data structure while running on the main thread.
*/
class UpdateVolumeRunnable : public nsRunnable
{
public:
UpdateVolumeRunnable(nsVolumeService* aVolumeService, const Volume* aVolume)
: mVolumeService(aVolumeService),
mVolume(new nsVolume(aVolume))
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
}
NS_IMETHOD Run()
{
MOZ_ASSERT(NS_IsMainThread());
DBG("UpdateVolumeRunnable::Run '%s' state %s gen %d locked %d",
mVolume->NameStr(), mVolume->StateStr(), mVolume->MountGeneration(),
(int)mVolume->IsMountLocked());
mVolumeService->UpdateVolume(mVolume);
mVolumeService = NULL;
mVolume = NULL;
return NS_OK;
}
private:
nsRefPtr<nsVolumeService> mVolumeService;
nsRefPtr<nsVolume> mVolume;
};
void nsVolumeService::UpdateVolumeIOThread(const Volume* aVolume)
{
DBG("UpdateVolumeIOThread: Volume '%s' state %s mount '%s' gen %d locked %d",
aVolume->NameStr(), aVolume->StateStr(), aVolume->MountPoint().get(),
aVolume->MountGeneration(), (int)aVolume->IsMountLocked());
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
NS_DispatchToMainThread(new UpdateVolumeRunnable(this, aVolume));
}
} // namespace system
} // namespace mozilla