gecko/dom/bluetooth/BluetoothService.cpp

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "base/basictypes.h"
#include "BluetoothService.h"
#include "BluetoothManager.h"
#include "BluetoothParent.h"
#include "BluetoothReplyRunnable.h"
#include "BluetoothServiceChildProcess.h"
#include "jsapi.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/unused.h"
#include "mozilla/Util.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/bluetooth/BluetoothTypes.h"
#include "mozilla/ipc/UnixSocket.h"
#include "nsContentUtils.h"
#include "nsIDOMDOMRequest.h"
#include "nsIObserverService.h"
#include "nsISettingsService.h"
#include "nsISystemMessagesInternal.h"
#include "nsITimer.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "nsXPCOMCIDInternal.h"
#include "nsXULAppAPI.h"
#if defined(MOZ_B2G_BT)
# if defined(MOZ_BLUETOOTH_GONK)
# include "BluetoothGonkService.h"
# elif defined(MOZ_BLUETOOTH_DBUS)
# include "BluetoothDBusService.h"
# else
# error No_suitable_backend_for_bluetooth!
# endif
#endif
#define MOZSETTINGS_CHANGED_ID "mozsettings-changed"
#define BLUETOOTH_ENABLED_SETTING "bluetooth.enabled"
#define DEFAULT_SHUTDOWN_TIMER_MS 5000
using namespace mozilla;
using namespace mozilla::dom;
USING_BLUETOOTH_NAMESPACE
namespace {
StaticRefPtr<BluetoothService> gBluetoothService;
bool gInShutdown = false;
bool
IsMainProcess()
{
return XRE_GetProcessType() == GeckoProcessType_Default;
}
PLDHashOperator
RemoveAllSignalHandlers(const nsAString& aKey,
nsAutoPtr<BluetoothSignalObserverList>& aData,
void* aUserArg)
{
aData->RemoveObserver(static_cast<BluetoothSignalObserver*>(aUserArg));
return aData->Length() ? PL_DHASH_NEXT : PL_DHASH_REMOVE;
}
void
ShutdownTimeExceeded(nsITimer* aTimer, void* aClosure)
{
MOZ_ASSERT(NS_IsMainThread());
*static_cast<bool*>(aClosure) = true;
}
void
GetAllBluetoothActors(InfallibleTArray<BluetoothParent*>& aActors)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aActors.IsEmpty());
nsAutoTArray<ContentParent*, 20> contentActors;
ContentParent::GetAll(contentActors);
for (uint32_t contentIndex = 0;
contentIndex < contentActors.Length();
contentIndex++) {
MOZ_ASSERT(contentActors[contentIndex]);
AutoInfallibleTArray<PBluetoothParent*, 5> bluetoothActors;
contentActors[contentIndex]->ManagedPBluetoothParent(bluetoothActors);
for (uint32_t bluetoothIndex = 0;
bluetoothIndex < bluetoothActors.Length();
bluetoothIndex++) {
MOZ_ASSERT(bluetoothActors[bluetoothIndex]);
BluetoothParent* actor =
static_cast<BluetoothParent*>(bluetoothActors[bluetoothIndex]);
aActors.AppendElement(actor);
}
}
}
} // anonymous namespace
class BluetoothService::ToggleBtAck : public nsRunnable
{
public:
ToggleBtAck(bool aEnabled)
: mEnabled(aEnabled)
{
MOZ_ASSERT(!NS_IsMainThread());
}
NS_IMETHOD Run()
{
MOZ_ASSERT(NS_IsMainThread());
if (!gBluetoothService) {
return NS_OK;
}
if (!gInShutdown) {
// Notify all the managers about the state change.
gBluetoothService->SetEnabled(mEnabled);
}
if (!mEnabled || gInShutdown) {
// Shut down the command thread if it still exists.
if (gBluetoothService->mBluetoothCommandThread) {
nsCOMPtr<nsIThread> thread;
gBluetoothService->mBluetoothCommandThread.swap(thread);
if (NS_FAILED(thread->Shutdown())) {
NS_WARNING("Failed to shut down the bluetooth command thread!");
}
}
if (gInShutdown) {
gBluetoothService = nullptr;
}
}
return NS_OK;
}
private:
bool mEnabled;
};
class BluetoothService::ToggleBtTask : public nsRunnable
{
public:
ToggleBtTask(bool aEnabled)
: mEnabled(aEnabled)
{
MOZ_ASSERT(NS_IsMainThread());
}
NS_IMETHOD Run()
{
MOZ_ASSERT(!NS_IsMainThread());
if (mEnabled) {
if (NS_FAILED(gBluetoothService->StartInternal())) {
NS_WARNING("Bluetooth service failed to start!");
mEnabled = !mEnabled;
}
}
else if (NS_FAILED(gBluetoothService->StopInternal())) {
NS_WARNING("Bluetooth service failed to stop!");
mEnabled = !mEnabled;
}
nsCOMPtr<nsIRunnable> ackTask = new BluetoothService::ToggleBtAck(mEnabled);
if (NS_FAILED(NS_DispatchToMainThread(ackTask))) {
NS_WARNING("Failed to dispatch to main thread!");
}
return NS_OK;
}
private:
bool mEnabled;
};
class BluetoothService::StartupTask : public nsISettingsServiceCallback
{
public:
NS_DECL_ISUPPORTS
NS_IMETHOD Handle(const nsAString& aName, const jsval& aResult, JSContext* aCx)
{
MOZ_ASSERT(NS_IsMainThread());
if (!aResult.isBoolean()) {
NS_WARNING("Setting for '" BLUETOOTH_ENABLED_SETTING "' is not a boolean!");
return NS_OK;
}
// It is theoretically possible to shut down before the first settings check
// has completed (though extremely unlikely).
if (gBluetoothService) {
return gBluetoothService->HandleStartupSettingsCheck(aResult.toBoolean());
}
return NS_OK;
}
NS_IMETHOD HandleError(const nsAString& aName, JSContext* aCx)
{
NS_WARNING("Unable to get value for '" BLUETOOTH_ENABLED_SETTING "'");
return NS_OK;
}
};
NS_IMPL_ISUPPORTS1(BluetoothService::StartupTask, nsISettingsServiceCallback);
NS_IMPL_ISUPPORTS1(BluetoothService, nsIObserver)
BluetoothService::~BluetoothService()
{
Cleanup();
}
// static
BluetoothService*
BluetoothService::Create()
{
#if defined(MOZ_B2G_BT)
if (!IsMainProcess()) {
return BluetoothServiceChildProcess::Create();
}
#endif
#if defined(MOZ_BLUETOOTH_GONK)
return new BluetoothGonkService();
#elif defined(MOZ_BLUETOOTH_DBUS)
return new BluetoothDBusService();
#endif
NS_WARNING("No platform support for bluetooth!");
return nullptr;
}
bool
BluetoothService::Init()
{
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
NS_ENSURE_TRUE(obs, false);
if (NS_FAILED(obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
false))) {
NS_WARNING("Failed to add shutdown observer!");
return false;
}
// Only the main process should observe bluetooth settings changes.
if (IsMainProcess() &&
NS_FAILED(obs->AddObserver(this, MOZSETTINGS_CHANGED_ID, false))) {
NS_WARNING("Failed to add settings change observer!");
return false;
}
mRegisteredForLocalAgent = true;
return true;
}
void
BluetoothService::Cleanup()
{
MOZ_ASSERT(NS_IsMainThread());
if (mRegisteredForLocalAgent) {
UnregisterBluetoothSignalHandler(NS_LITERAL_STRING(LOCAL_AGENT_PATH), this);
mRegisteredForLocalAgent = false;
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs &&
(NS_FAILED(obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) ||
NS_FAILED(obs->RemoveObserver(this, MOZSETTINGS_CHANGED_ID)))) {
NS_WARNING("Can't unregister observers!");
}
}
void
BluetoothService::RegisterBluetoothSignalHandler(const nsAString& aNodeName,
BluetoothSignalObserver* aHandler)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aHandler);
BluetoothSignalObserverList* ol;
if (!mBluetoothSignalObserverTable.Get(aNodeName, &ol)) {
ol = new BluetoothSignalObserverList();
mBluetoothSignalObserverTable.Put(aNodeName, ol);
}
ol->AddObserver(aHandler);
}
void
BluetoothService::UnregisterBluetoothSignalHandler(const nsAString& aNodeName,
BluetoothSignalObserver* aHandler)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aHandler);
BluetoothSignalObserverList* ol;
if (mBluetoothSignalObserverTable.Get(aNodeName, &ol)) {
ol->RemoveObserver(aHandler);
if (ol->Length() == 0) {
mBluetoothSignalObserverTable.Remove(aNodeName);
}
}
else {
NS_WARNING("Node was never registered!");
}
}
void
BluetoothService::UnregisterAllSignalHandlers(BluetoothSignalObserver* aHandler)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aHandler);
mBluetoothSignalObserverTable.Enumerate(RemoveAllSignalHandlers, aHandler);
}
void
BluetoothService::DistributeSignal(const BluetoothSignal& aSignal)
{
MOZ_ASSERT(NS_IsMainThread());
// Notify observers that a message has been sent
BluetoothSignalObserverList* ol;
if (!mBluetoothSignalObserverTable.Get(aSignal.path(), &ol)) {
#if DEBUG
nsAutoCString msg("No observer registered for path ");
msg.Append(NS_ConvertUTF16toUTF8(aSignal.path()));
NS_WARNING(msg.get());
#endif
return;
}
MOZ_ASSERT(ol->Length());
ol->Broadcast(aSignal);
}
nsresult
BluetoothService::StartStopBluetooth(bool aStart)
{
MOZ_ASSERT(NS_IsMainThread());
if (gInShutdown) {
if (aStart) {
// Don't try to start if we're already shutting down.
MOZ_ASSERT(false, "Start called while in shutdown!");
return NS_ERROR_FAILURE;
}
if (!mBluetoothCommandThread) {
// Don't create a new thread after we've begun shutdown since bluetooth
// can't be running.
return NS_OK;
}
}
nsresult rv;
if (!mBluetoothCommandThread) {
MOZ_ASSERT(!gInShutdown);
rv = NS_NewNamedThread("BluetoothCmd",
getter_AddRefs(mBluetoothCommandThread));
NS_ENSURE_SUCCESS(rv, rv);
}
if (aStart) {
RegisterBluetoothSignalHandler(NS_LITERAL_STRING(LOCAL_AGENT_PATH), this);
RegisterBluetoothSignalHandler(NS_LITERAL_STRING(REMOTE_AGENT_PATH), this);
BluetoothManagerList::ForwardIterator iter(mLiveManagers);
while (iter.HasMore()) {
RegisterBluetoothSignalHandler(NS_LITERAL_STRING("/"), (BluetoothSignalObserver*)iter.GetNext());
}
}
nsCOMPtr<nsIRunnable> runnable = new ToggleBtTask(aStart);
rv = mBluetoothCommandThread->Dispatch(runnable, NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void
BluetoothService::SetEnabled(bool aEnabled)
{
MOZ_ASSERT(NS_IsMainThread());
if (aEnabled == mEnabled) {
// Nothing to do, maybe something failed.
return;
}
mEnabled = aEnabled;
AutoInfallibleTArray<BluetoothParent*, 10> childActors;
GetAllBluetoothActors(childActors);
for (uint32_t index = 0; index < childActors.Length(); index++) {
unused << childActors[index]->SendEnabled(aEnabled);
}
BluetoothManagerList::ForwardIterator iter(mLiveManagers);
while (iter.HasMore()) {
if (NS_FAILED(iter.GetNext()->FireEnabledDisabledEvent(aEnabled))) {
NS_WARNING("FireEnabledDisabledEvent failed!");
}
}
}
nsresult
BluetoothService::HandleStartup()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mSettingsCheckInProgress);
nsCOMPtr<nsISettingsService> settings =
do_GetService("@mozilla.org/settingsService;1");
NS_ENSURE_TRUE(settings, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsISettingsServiceLock> settingsLock;
nsresult rv = settings->CreateLock(getter_AddRefs(settingsLock));
NS_ENSURE_SUCCESS(rv, rv);
nsRefPtr<StartupTask> callback = new StartupTask();
rv = settingsLock->Get(BLUETOOTH_ENABLED_SETTING, callback);
NS_ENSURE_SUCCESS(rv, rv);
mSettingsCheckInProgress = true;
return NS_OK;
}
nsresult
BluetoothService::HandleStartupSettingsCheck(bool aEnable)
{
MOZ_ASSERT(NS_IsMainThread());
if (!mSettingsCheckInProgress) {
// Somehow the enabled setting was changed before our first settings check
// completed. Don't do anything.
return NS_OK;
}
MOZ_ASSERT(!IsEnabled());
if (aEnable) {
return StartStopBluetooth(true);
}
return NS_OK;
}
nsresult
BluetoothService::HandleSettingsChanged(const nsAString& aData)
{
MOZ_ASSERT(NS_IsMainThread());
// The string that we're interested in will be a JSON string that looks like:
// {"key":"bluetooth.enabled","value":true}
JSContext* cx = nsContentUtils::GetSafeJSContext();
if (!cx) {
return NS_OK;
}
JS::Value val;
if (!JS_ParseJSON(cx, aData.BeginReading(), aData.Length(), &val)) {
return JS_ReportPendingException(cx) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
if (!val.isObject()) {
return NS_OK;
}
JSObject& obj(val.toObject());
JS::Value key;
if (!JS_GetProperty(cx, &obj, "key", &key)) {
MOZ_ASSERT(!JS_IsExceptionPending(cx));
return NS_ERROR_OUT_OF_MEMORY;
}
if (!key.isString()) {
return NS_OK;
}
JSBool match;
if (!JS_StringEqualsAscii(cx, key.toString(), BLUETOOTH_ENABLED_SETTING,
&match)) {
MOZ_ASSERT(!JS_IsExceptionPending(cx));
return NS_ERROR_OUT_OF_MEMORY;
}
if (!match) {
return NS_OK;
}
JS::Value value;
if (!JS_GetProperty(cx, &obj, "value", &value)) {
MOZ_ASSERT(!JS_IsExceptionPending(cx));
return NS_ERROR_OUT_OF_MEMORY;
}
if (!value.isBoolean()) {
MOZ_ASSERT(false, "Expecting a boolean for 'bluetooth.enabled'!");
return NS_ERROR_UNEXPECTED;
}
if (mSettingsCheckInProgress) {
// Somehow the setting for bluetooth has been flipped before our first
// settings check completed. Flip this flag so that we ignore the result
// of that check whenever it finishes.
mSettingsCheckInProgress = false;
}
if (value.toBoolean() == IsEnabled()) {
// Nothing to do here.
return NS_OK;
}
nsresult rv;
if (IsEnabled()) {
rv = StartStopBluetooth(false);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
rv = StartStopBluetooth(true);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
BluetoothService::HandleShutdown()
{
MOZ_ASSERT(NS_IsMainThread());
// This is a two phase shutdown. First we notify all child processes that
// bluetooth is going away, and then we wait for them to acknowledge. Then we
// close down all the bluetooth machinery.
gInShutdown = true;
Cleanup();
AutoInfallibleTArray<BluetoothParent*, 10> childActors;
GetAllBluetoothActors(childActors);
if (!childActors.IsEmpty()) {
// Notify child processes that they should stop using bluetooth now.
for (uint32_t index = 0; index < childActors.Length(); index++) {
childActors[index]->BeginShutdown();
}
// Create a timer to ensure that we don't wait forever for a child process
// or the bluetooth threads to finish. If we don't get a timer or can't use
// it for some reason then we skip all the waiting entirely since we really
// can't afford to hang on shutdown.
nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID);
MOZ_ASSERT(timer);
if (timer) {
bool timeExceeded = false;
if (NS_SUCCEEDED(timer->InitWithFuncCallback(ShutdownTimeExceeded,
&timeExceeded,
DEFAULT_SHUTDOWN_TIMER_MS,
nsITimer::TYPE_ONE_SHOT))) {
nsIThread* currentThread = NS_GetCurrentThread();
MOZ_ASSERT(currentThread);
// Wait for those child processes to acknowledge.
while (!timeExceeded && !childActors.IsEmpty()) {
if (!NS_ProcessNextEvent(currentThread)) {
MOZ_ASSERT(false, "Something horribly wrong here!");
break;
}
GetAllBluetoothActors(childActors);
}
if (NS_FAILED(timer->Cancel())) {
MOZ_NOT_REACHED("Failed to cancel shutdown timer, this will crash!");
}
}
else {
MOZ_ASSERT(false, "Failed to initialize shutdown timer!");
}
}
}
if (IsEnabled() && NS_FAILED(StartStopBluetooth(false))) {
MOZ_ASSERT(false, "Failed to deliver stop message!");
}
return NS_OK;
}
void
BluetoothService::RegisterManager(BluetoothManager* aManager)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aManager);
MOZ_ASSERT(!mLiveManagers.Contains(aManager));
mLiveManagers.AppendElement(aManager);
RegisterBluetoothSignalHandler(aManager->GetPath(), aManager);
}
void
BluetoothService::UnregisterManager(BluetoothManager* aManager)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aManager);
MOZ_ASSERT(mLiveManagers.Contains(aManager));
UnregisterBluetoothSignalHandler(aManager->GetPath(), aManager);
mLiveManagers.RemoveElement(aManager);
}
// static
BluetoothService*
BluetoothService::Get()
{
MOZ_ASSERT(NS_IsMainThread());
// If we already exist, exit early
if (gBluetoothService) {
return gBluetoothService;
}
// If we're in shutdown, don't create a new instance
if (gInShutdown) {
NS_WARNING("BluetoothService can't be created during shutdown");
return nullptr;
}
// Create new instance, register, return
nsRefPtr<BluetoothService> service = BluetoothService::Create();
NS_ENSURE_TRUE(service, nullptr);
if (!service->Init()) {
service->Cleanup();
return nullptr;
}
gBluetoothService = service;
return gBluetoothService;
}
nsresult
BluetoothService::Observe(nsISupports* aSubject, const char* aTopic,
const PRUnichar* aData)
{
MOZ_ASSERT(NS_IsMainThread());
if (!strcmp(aTopic, "profile-after-change")) {
return HandleStartup();
}
if (!strcmp(aTopic, MOZSETTINGS_CHANGED_ID)) {
return HandleSettingsChanged(nsDependentString(aData));
}
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
return HandleShutdown();
}
MOZ_ASSERT(false, "BluetoothService got unexpected topic!");
return NS_ERROR_UNEXPECTED;
}
bool
SetJsObject(JSContext* aContext,
JSObject* aObj,
const InfallibleTArray<BluetoothNamedValue>& aData)
{
for (uint32_t i = 0; i < aData.Length(); i++) {
jsval v;
if (aData[i].value().type() == BluetoothValue::TnsString) {
nsString data = aData[i].value().get_nsString();
JSString* JsData = JS_NewStringCopyN(aContext,
NS_ConvertUTF16toUTF8(data).get(),
data.Length());
NS_ENSURE_TRUE(JsData, NS_ERROR_OUT_OF_MEMORY);
v = STRING_TO_JSVAL(JsData);
} else if (aData[i].value().type() == BluetoothValue::Tuint32_t) {
int data = aData[i].value().get_uint32_t();
v = INT_TO_JSVAL(data);
} else if (aData[i].value().type() == BluetoothValue::Tbool) {
bool data = aData[i].value().get_bool();
v = BOOLEAN_TO_JSVAL(data);
} else {
NS_WARNING("SetJsObject: Parameter is not handled");
}
if (!JS_SetProperty(aContext, aObj,
NS_ConvertUTF16toUTF8(aData[i].name()).get(),
&v)) {
return false;
}
}
return true;
}
void
BluetoothService::Notify(const BluetoothSignal& aData)
{
InfallibleTArray<BluetoothNamedValue> arr = aData.value().get_ArrayOfBluetoothNamedValue();
nsString type;
JSContext* cx = nsContentUtils::GetSafeJSContext();
NS_ASSERTION(!::JS_IsExceptionPending(cx),
"Shouldn't get here when an exception is pending!");
JSAutoRequest jsar(cx);
JSObject* obj = JS_NewObject(cx, NULL, NULL, NULL);
if (!obj) {
NS_WARNING("Failed to new JSObject for system message!");
return;
}
bool ok = SetJsObject(cx, obj, arr);
if (!ok) {
NS_WARNING("Failed to set properties of system message!");
return;
}
if (aData.name().EqualsLiteral("RequestConfirmation")) {
NS_ASSERTION(arr.Length() == 3, "RequestConfirmation: Wrong length of parameters");
type.AssignLiteral("bluetooth-requestconfirmation");
} else if (aData.name().EqualsLiteral("RequestPinCode")) {
NS_ASSERTION(arr.Length() == 2, "RequestPinCode: Wrong length of parameters");
type.AssignLiteral("bluetooth-requestpincode");
} else if (aData.name().EqualsLiteral("RequestPasskey")) {
NS_ASSERTION(arr.Length() == 2, "RequestPinCode: Wrong length of parameters");
type.AssignLiteral("bluetooth-requestpasskey");
} else if (aData.name().EqualsLiteral("Authorize")) {
NS_ASSERTION(arr.Length() == 2, "Authorize: Wrong length of parameters");
type.AssignLiteral("bluetooth-authorize");
} else if (aData.name().EqualsLiteral("Cancel")) {
NS_ASSERTION(arr.Length() == 0, "Cancel: Wrong length of parameters");
type.AssignLiteral("bluetooth-cancel");
} else if (aData.name().EqualsLiteral("PairedStatusChanged")) {
NS_ASSERTION(arr.Length() == 1, "PairedStatusChagned: Wrong length of parameters");
type.AssignLiteral("bluetooth-pairedstatuschanged");
} else {
#ifdef DEBUG
nsCString warningMsg;
warningMsg.AssignLiteral("Not handling service signal: ");
warningMsg.Append(NS_ConvertUTF16toUTF8(aData.name()));
NS_WARNING(warningMsg.get());
#endif
}
nsCOMPtr<nsISystemMessagesInternal> systemMessenger =
do_GetService("@mozilla.org/system-message-internal;1");
if (!systemMessenger) {
NS_WARNING("Failed to get SystemMessenger service!");
return;
}
systemMessenger->BroadcastMessage(type, OBJECT_TO_JSVAL(obj));
}