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[Linux] Do not report BLE scan error if BlueZ is gone (project-chip#3…
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…2586)

* [Linux] Do not report BLE scan error if BlueZ is gone

* Wrap GDBusObjectManager with GAutoPtr

* Wrap glib callbacks with lambda

* Wrap start/stop implementations with lambda

* Fix signal handler type
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@arkq
arkq authored Mar 16, 2024
1 parent 1ef9228 commit 8f4c8b5
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Showing 2 changed files with 74 additions and 63 deletions.
115 changes: 63 additions & 52 deletions src/platform/Linux/bluez/ChipDeviceScanner.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -69,11 +69,11 @@ CHIP_ERROR ChipDeviceScanner::Init(BluezAdapter1 * adapter, ChipDeviceScannerDel
VerifyOrDie(g_main_context_get_thread_default() != nullptr);

GAutoPtr<GError> err;
self->mManager = g_dbus_object_manager_client_new_for_bus_sync(
self->mManager.reset(g_dbus_object_manager_client_new_for_bus_sync(
G_BUS_TYPE_SYSTEM, G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_NONE, BLUEZ_INTERFACE, "/",
bluez_object_manager_client_get_proxy_type, nullptr /* unused user data in the Proxy Type Func */,
nullptr /* destroy notify */, nullptr /* cancellable */, &err.GetReceiver());
VerifyOrReturnError(self->mManager != nullptr, CHIP_ERROR_INTERNAL,
nullptr /* destroy notify */, nullptr /* cancellable */, &err.GetReceiver()));
VerifyOrReturnError(self->mManager, CHIP_ERROR_INTERNAL,
ChipLogError(Ble, "Failed to get D-Bus object manager for device scanning: %s", err->message));
return CHIP_NO_ERROR;
},
Expand All @@ -95,8 +95,7 @@ void ChipDeviceScanner::Shutdown()
// released during a D-Bus signal being processed.
PlatformMgrImpl().GLibMatterContextInvokeSync(
+[](ChipDeviceScanner * self) {
if (self->mManager != nullptr)
g_object_unref(self->mManager);
self->mManager.reset();
self->mAdapter.reset();
return CHIP_NO_ERROR;
},
Expand All @@ -112,7 +111,8 @@ CHIP_ERROR ChipDeviceScanner::StartScan(System::Clock::Timeout timeout)
VerifyOrReturnError(mTimerState == ScannerTimerState::TIMER_CANCELED, CHIP_ERROR_INCORRECT_STATE);

mCancellable.reset(g_cancellable_new());
CHIP_ERROR err = PlatformMgrImpl().GLibMatterContextInvokeSync(MainLoopStartScan, this);
CHIP_ERROR err = PlatformMgrImpl().GLibMatterContextInvokeSync(
+[](ChipDeviceScanner * self) { return self->StartScanImpl(); }, this);
if (err != CHIP_NO_ERROR)
{
ChipLogError(Ble, "Failed to initiate BLE scan start: %" CHIP_ERROR_FORMAT, err.Format());
Expand Down Expand Up @@ -153,7 +153,8 @@ CHIP_ERROR ChipDeviceScanner::StopScan()
assertChipStackLockedByCurrentThread();
VerifyOrReturnError(mScannerState == ChipDeviceScannerState::SCANNER_SCANNING, CHIP_NO_ERROR);

CHIP_ERROR err = PlatformMgrImpl().GLibMatterContextInvokeSync(MainLoopStopScan, this);
CHIP_ERROR err = PlatformMgrImpl().GLibMatterContextInvokeSync(
+[](ChipDeviceScanner * self) { return self->StopScanImpl(); }, this);
if (err != CHIP_NO_ERROR)
{
ChipLogError(Ble, "Failed to initiate BLE scan stop: %" CHIP_ERROR_FORMAT, err.Format());
Expand All @@ -178,59 +179,63 @@ CHIP_ERROR ChipDeviceScanner::StopScan()
return CHIP_NO_ERROR;
}

CHIP_ERROR ChipDeviceScanner::MainLoopStopScan(ChipDeviceScanner * self)
CHIP_ERROR ChipDeviceScanner::StopScanImpl()
{
GAutoPtr<GError> error;

// In case we are currently running a scan
g_cancellable_cancel(self->mCancellable.get());
self->mCancellable.reset();
g_cancellable_cancel(mCancellable.get());
mCancellable.reset();

if (self->mObjectAddedSignal)
if (mObjectAddedSignal)
{
g_signal_handler_disconnect(self->mManager, self->mObjectAddedSignal);
self->mObjectAddedSignal = 0;
g_signal_handler_disconnect(mManager.get(), mObjectAddedSignal);
mObjectAddedSignal = 0;
}

if (self->mInterfaceChangedSignal)
if (mPropertiesChangedSignal)
{
g_signal_handler_disconnect(self->mManager, self->mInterfaceChangedSignal);
self->mInterfaceChangedSignal = 0;
g_signal_handler_disconnect(mManager.get(), mPropertiesChangedSignal);
mPropertiesChangedSignal = 0;
}

if (!bluez_adapter1_call_stop_discovery_sync(self->mAdapter.get(), nullptr /* not cancellable */, &error.GetReceiver()))
GAutoPtr<GError> error;
if (!bluez_adapter1_call_stop_discovery_sync(mAdapter.get(), nullptr /* not cancellable */, &error.GetReceiver()))
{
ChipLogError(Ble, "Failed to stop discovery %s", error->message);
return CHIP_ERROR_INTERNAL;
// Do not report error if BlueZ service is not available on the bus (service unknown) or
// the requested BLE adapter is not available (unknown object). In both cases the scan is
// already stopped.
if (error->code != G_DBUS_ERROR_SERVICE_UNKNOWN && error->code != G_DBUS_ERROR_UNKNOWN_OBJECT)
{
ChipLogError(Ble, "Failed to stop discovery: %s", error->message);
return CHIP_ERROR_INTERNAL;
}
}

return CHIP_NO_ERROR;
}

void ChipDeviceScanner::SignalObjectAdded(GDBusObjectManager * manager, GDBusObject * object, ChipDeviceScanner * self)
void ChipDeviceScanner::SignalObjectAdded(GDBusObjectManager * aManager, GDBusObject * aObject)
{
GAutoPtr<BluezDevice1> device(bluez_object_get_device1(reinterpret_cast<BluezObject *>(object)));
VerifyOrReturn(device.get() != nullptr);
GAutoPtr<BluezDevice1> device(bluez_object_get_device1(reinterpret_cast<BluezObject *>(aObject)));
VerifyOrReturn(device);

self->ReportDevice(*device.get());
ReportDevice(*device.get());
}

void ChipDeviceScanner::SignalInterfaceChanged(GDBusObjectManagerClient * manager, GDBusObjectProxy * object,
GDBusProxy * aInterface, GVariant * aChangedProperties,
const gchar * const * aInvalidatedProps, ChipDeviceScanner * self)
void ChipDeviceScanner::SignalInterfacePropertiesChanged(GDBusObjectManagerClient * aManager, GDBusObjectProxy * aObject,
GDBusProxy * aInterface, GVariant * aChangedProperties,
const char * const * aInvalidatedProps)
{
GAutoPtr<BluezDevice1> device(bluez_object_get_device1(reinterpret_cast<BluezObject *>(object)));
VerifyOrReturn(device.get() != nullptr);
GAutoPtr<BluezDevice1> device(bluez_object_get_device1(reinterpret_cast<BluezObject *>(aObject)));
VerifyOrReturn(device);

self->ReportDevice(*device.get());
ReportDevice(*device.get());
}

void ChipDeviceScanner::ReportDevice(BluezDevice1 & device)
{
if (strcmp(bluez_device1_get_adapter(&device), g_dbus_proxy_get_object_path(G_DBUS_PROXY(mAdapter.get()))) != 0)
{
return;
}
VerifyOrReturn(strcmp(bluez_device1_get_adapter(&device),
g_dbus_proxy_get_object_path(reinterpret_cast<GDBusProxy *>(mAdapter.get()))) == 0);

chip::Ble::ChipBLEDeviceIdentificationInfo deviceInfo;

Expand All @@ -245,10 +250,8 @@ void ChipDeviceScanner::ReportDevice(BluezDevice1 & device)

void ChipDeviceScanner::RemoveDevice(BluezDevice1 & device)
{
if (strcmp(bluez_device1_get_adapter(&device), g_dbus_proxy_get_object_path(G_DBUS_PROXY(mAdapter.get()))) != 0)
{
return;
}
VerifyOrReturn(strcmp(bluez_device1_get_adapter(&device),
g_dbus_proxy_get_object_path(reinterpret_cast<GDBusProxy *>(mAdapter.get()))) == 0);

chip::Ble::ChipBLEDeviceIdentificationInfo deviceInfo;

Expand All @@ -257,30 +260,39 @@ void ChipDeviceScanner::RemoveDevice(BluezDevice1 & device)
return;
}

const auto devicePath = g_dbus_proxy_get_object_path(G_DBUS_PROXY(&device));
GAutoPtr<GError> error;

const auto devicePath = g_dbus_proxy_get_object_path(reinterpret_cast<GDBusProxy *>(&device));
if (!bluez_adapter1_call_remove_device_sync(mAdapter.get(), devicePath, nullptr, &error.GetReceiver()))
{
ChipLogDetail(Ble, "Failed to remove device %s: %s", StringOrNullMarker(devicePath), error->message);
}
}

CHIP_ERROR ChipDeviceScanner::MainLoopStartScan(ChipDeviceScanner * self)
CHIP_ERROR ChipDeviceScanner::StartScanImpl()
{
GAutoPtr<GError> error;

self->mObjectAddedSignal = g_signal_connect(self->mManager, "object-added", G_CALLBACK(SignalObjectAdded), self);
self->mInterfaceChangedSignal =
g_signal_connect(self->mManager, "interface-proxy-properties-changed", G_CALLBACK(SignalInterfaceChanged), self);
mObjectAddedSignal = g_signal_connect(mManager.get(), "object-added",
G_CALLBACK(+[](GDBusObjectManager * aMgr, GDBusObject * aObj, ChipDeviceScanner * self) {
return self->SignalObjectAdded(aMgr, aObj);
}),
this);

mPropertiesChangedSignal = g_signal_connect(
mManager.get(), "interface-proxy-properties-changed",
G_CALLBACK(+[](GDBusObjectManagerClient * aMgr, GDBusObjectProxy * aObj, GDBusProxy * aIface, GVariant * aChangedProps,
const char * const * aInvalidatedProps, ChipDeviceScanner * self) {
return self->SignalInterfacePropertiesChanged(aMgr, aObj, aIface, aChangedProps, aInvalidatedProps);
}),
this);

ChipLogProgress(Ble, "BLE removing known devices.");
for (BluezObject & object : BluezObjectList(self->mManager))
ChipLogProgress(Ble, "BLE removing known devices");
for (BluezObject & object : BluezObjectList(mManager.get()))
{
GAutoPtr<BluezDevice1> device(bluez_object_get_device1(&object));
if (device.get() != nullptr)
if (device)
{
self->RemoveDevice(*device.get());
RemoveDevice(*device.get());
}
}

Expand All @@ -295,16 +307,15 @@ CHIP_ERROR ChipDeviceScanner::MainLoopStartScan(ChipDeviceScanner * self)
g_variant_builder_add(&filterBuilder, "{sv}", "Transport", g_variant_new_string("le"));
GVariant * filter = g_variant_builder_end(&filterBuilder);

if (!bluez_adapter1_call_set_discovery_filter_sync(self->mAdapter.get(), filter, self->mCancellable.get(),
&error.GetReceiver()))
if (!bluez_adapter1_call_set_discovery_filter_sync(mAdapter.get(), filter, mCancellable.get(), &error.GetReceiver()))
{
// Not critical: ignore if fails
ChipLogError(Ble, "Failed to set discovery filters: %s", error->message);
error.reset();
}

ChipLogProgress(Ble, "BLE initiating scan.");
if (!bluez_adapter1_call_start_discovery_sync(self->mAdapter.get(), self->mCancellable.get(), &error.GetReceiver()))
ChipLogProgress(Ble, "BLE initiating scan");
if (!bluez_adapter1_call_start_discovery_sync(mAdapter.get(), mCancellable.get(), &error.GetReceiver()))
{
ChipLogError(Ble, "Failed to start discovery: %s", error->message);
return CHIP_ERROR_INTERNAL;
Expand Down
22 changes: 11 additions & 11 deletions src/platform/Linux/bluez/ChipDeviceScanner.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -92,13 +92,13 @@ class ChipDeviceScanner
TIMER_EXPIRED
};

CHIP_ERROR StartScanImpl();
CHIP_ERROR StopScanImpl();
static void TimerExpiredCallback(chip::System::Layer * layer, void * appState);
static CHIP_ERROR MainLoopStartScan(ChipDeviceScanner * self);
static CHIP_ERROR MainLoopStopScan(ChipDeviceScanner * self);
static void SignalObjectAdded(GDBusObjectManager * manager, GDBusObject * object, ChipDeviceScanner * self);
static void SignalInterfaceChanged(GDBusObjectManagerClient * manager, GDBusObjectProxy * object, GDBusProxy * aInterface,
GVariant * aChangedProperties, const gchar * const * aInvalidatedProps,
ChipDeviceScanner * self);

void SignalObjectAdded(GDBusObjectManager * aManager, GDBusObject * aObject);
void SignalInterfacePropertiesChanged(GDBusObjectManagerClient * aManager, GDBusObjectProxy * aObject, GDBusProxy * aInterface,
GVariant * aChangedProperties, const char * const * aInvalidatedProps);

/// Check if a given device is a CHIP device and if yes, report it as discovered
void ReportDevice(BluezDevice1 & device);
Expand All @@ -107,12 +107,12 @@ class ChipDeviceScanner
/// so that it can be re-discovered if it's still advertising.
void RemoveDevice(BluezDevice1 & device);

GDBusObjectManager * mManager = nullptr;
GAutoPtr<GDBusObjectManager> mManager;
GAutoPtr<BluezAdapter1> mAdapter;
ChipDeviceScannerDelegate * mDelegate = nullptr;
gulong mObjectAddedSignal = 0;
gulong mInterfaceChangedSignal = 0;
ChipDeviceScannerState mScannerState = ChipDeviceScannerState::SCANNER_UNINITIALIZED;
ChipDeviceScannerDelegate * mDelegate = nullptr;
unsigned long mObjectAddedSignal = 0;
unsigned long mPropertiesChangedSignal = 0;
ChipDeviceScannerState mScannerState = ChipDeviceScannerState::SCANNER_UNINITIALIZED;
/// Used to track if timer has already expired and doesn't need to be canceled.
ScannerTimerState mTimerState = ScannerTimerState::TIMER_CANCELED;
GAutoPtr<GCancellable> mCancellable;
Expand Down

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