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Refactor controller startup a bit to share more code. (#28385)
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There was a lot of identical boilerplate between createControllerOnNewFabric and
createControllerOnExistingFabric.

checkIsRunning already sets error, which is why the setting of error if that
returns false was removed.
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@bzbarsky-apple
bzbarsky-apple authored Jul 29, 2023
1 parent 2a681e3 commit 693ef72
Showing 1 changed file with 97 additions and 120 deletions.
217 changes: 97 additions & 120 deletions src/darwin/Framework/CHIP/MTRDeviceControllerFactory.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -553,16 +553,21 @@ - (void)stopControllerFactory
_running = NO;
}

- (MTRDeviceController * _Nullable)createControllerOnExistingFabric:(MTRDeviceControllerStartupParams *)startupParams
error:(NSError * __autoreleasing *)error
/**
* Helper function to start a device controller with the given startup params.
* The fabricChecker block will run on the Matter queue, and is expected to
* return nil if pre-startup fabric table checks fail, and set fabricError to
* the right error value in that situation.
*/
- (MTRDeviceController * _Nullable)_startDeviceController:(MTRDeviceControllerStartupParams *)startupParams
fabricChecker:(MTRDeviceControllerStartupParamsInternal * (^)(
FabricTable * fabricTable, CHIP_ERROR & fabricError))fabricChecker
error:(NSError * __autoreleasing *)error
{
[self _assertCurrentQueueIsNotMatterQueue];

if (![self checkIsRunning:error]) {
MTR_LOG_ERROR("Trying to start controller while Matter controller factory is not running");
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_INCORRECT_STATE];
}
return nil;
}

Expand All @@ -578,53 +583,14 @@ - (MTRDeviceController * _Nullable)createControllerOnExistingFabric:(MTRDeviceCo

__block MTRDeviceControllerStartupParamsInternal * params = nil;
__block CHIP_ERROR fabricError = CHIP_NO_ERROR;

// We want the block to end up with just a pointer to the fabric table,
// since we know our on-stack instance will outlive the block.
FabricTable fabricTableInstance;
FabricTable * fabricTable = &fabricTableInstance;
dispatch_sync(_chipWorkQueue, ^{
const FabricInfo * fabric = nullptr;
BOOL ok = [self findMatchingFabric:*fabricTable params:startupParams fabric:&fabric];
if (!ok) {
MTR_LOG_ERROR("Can't start on existing fabric: fabric matching failed");
fabricError = CHIP_ERROR_INTERNAL;
return;
}

if (fabric == nullptr) {
MTR_LOG_ERROR("Can't start on existing fabric: fabric not found");
fabricError = CHIP_ERROR_NOT_FOUND;
return;
}

os_unfair_lock_lock(&_controllersLock);
NSArray<MTRDeviceController *> * controllersCopy = [_controllers copy];
os_unfair_lock_unlock(&_controllersLock);

for (MTRDeviceController * existing in controllersCopy) {
BOOL isRunning = YES; // assume the worst
if ([existing isRunningOnFabric:fabricTable fabricIndex:fabric->GetFabricIndex() isRunning:&isRunning]
!= CHIP_NO_ERROR) {
MTR_LOG_ERROR("Can't tell what fabric a controller is running on. Not safe to start.");
fabricError = CHIP_ERROR_INTERNAL;
return;
}

if (isRunning) {
MTR_LOG_ERROR("Can't start on existing fabric: another controller is running on it");
fabricError = CHIP_ERROR_INCORRECT_STATE;
return;
}
}

params = [[MTRDeviceControllerStartupParamsInternal alloc] initForExistingFabric:fabricTable
fabricIndex:fabric->GetFabricIndex()
keystore:_keystore
advertiseOperational:self.advertiseOperational
params:startupParams];
if (params == nil) {
fabricError = CHIP_ERROR_NO_MEMORY;
}
dispatch_sync(_chipWorkQueue, ^{
params = fabricChecker(fabricTable, fabricError);
});

if (params == nil) {
Expand Down Expand Up @@ -653,19 +619,68 @@ - (MTRDeviceController * _Nullable)createControllerOnExistingFabric:(MTRDeviceCo
return controller;
}

- (MTRDeviceController * _Nullable)createControllerOnExistingFabric:(MTRDeviceControllerStartupParams *)startupParams
error:(NSError * __autoreleasing *)error
{
[self _assertCurrentQueueIsNotMatterQueue];

return [self
_startDeviceController:startupParams
fabricChecker:^MTRDeviceControllerStartupParamsInternal *(FabricTable * fabricTable, CHIP_ERROR & fabricError) {
const FabricInfo * fabric = nullptr;
BOOL ok = [self findMatchingFabric:*fabricTable params:startupParams fabric:&fabric];
if (!ok) {
MTR_LOG_ERROR("Can't start on existing fabric: fabric matching failed");
fabricError = CHIP_ERROR_INTERNAL;
return nil;
}

if (fabric == nullptr) {
MTR_LOG_ERROR("Can't start on existing fabric: fabric not found");
fabricError = CHIP_ERROR_NOT_FOUND;
return nil;
}

os_unfair_lock_lock(&self->_controllersLock);
NSArray<MTRDeviceController *> * controllersCopy = [self->_controllers copy];
os_unfair_lock_unlock(&self->_controllersLock);

for (MTRDeviceController * existing in controllersCopy) {
BOOL isRunning = YES; // assume the worst
if ([existing isRunningOnFabric:fabricTable fabricIndex:fabric->GetFabricIndex() isRunning:&isRunning]
!= CHIP_NO_ERROR) {
MTR_LOG_ERROR("Can't tell what fabric a controller is running on. Not safe to start.");
fabricError = CHIP_ERROR_INTERNAL;
return nil;
}

if (isRunning) {
MTR_LOG_ERROR("Can't start on existing fabric: another controller is running on it");
fabricError = CHIP_ERROR_INCORRECT_STATE;
return nil;
}
}

auto * params =
[[MTRDeviceControllerStartupParamsInternal alloc] initForExistingFabric:fabricTable
fabricIndex:fabric->GetFabricIndex()
keystore:self->_keystore
advertiseOperational:self.advertiseOperational
params:startupParams];
if (params == nil) {
fabricError = CHIP_ERROR_NO_MEMORY;
}

return params;
}
error:error];
}

- (MTRDeviceController * _Nullable)createControllerOnNewFabric:(MTRDeviceControllerStartupParams *)startupParams
error:(NSError * __autoreleasing *)error
{
[self _assertCurrentQueueIsNotMatterQueue];

if (![self isRunning]) {
MTR_LOG_ERROR("Trying to start controller while Matter controller factory is not running");
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_INCORRECT_STATE];
}
return nil;
}

if (startupParams.vendorID == nil) {
MTR_LOG_ERROR("Must provide vendor id when starting controller on new fabric");
if (error != nil) {
Expand All @@ -682,71 +697,33 @@ - (MTRDeviceController * _Nullable)createControllerOnNewFabric:(MTRDeviceControl
return nil;
}

// Create the controller, so we start the event loop, since we plan to do
// our fabric table operations there.
auto * controller = [self createController];
if (controller == nil) {
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_NO_MEMORY];
}
return nil;
}

__block MTRDeviceControllerStartupParamsInternal * params = nil;
__block CHIP_ERROR fabricError = CHIP_NO_ERROR;
// We want the block to end up with just a pointer to the fabric table,
// since we know our on-stack instance will outlive the block.
FabricTable fabricTableInstance;
FabricTable * fabricTable = &fabricTableInstance;
dispatch_sync(_chipWorkQueue, ^{
const FabricInfo * fabric = nullptr;
BOOL ok = [self findMatchingFabric:*fabricTable params:startupParams fabric:&fabric];
if (!ok) {
MTR_LOG_ERROR("Can't start on new fabric: fabric matching failed");
fabricError = CHIP_ERROR_INTERNAL;
return;
}

if (fabric != nullptr) {
MTR_LOG_ERROR("Can't start on new fabric that matches existing fabric");
fabricError = CHIP_ERROR_INCORRECT_STATE;
return;
}

params = [[MTRDeviceControllerStartupParamsInternal alloc] initForNewFabric:fabricTable
keystore:_keystore
advertiseOperational:self.advertiseOperational
params:startupParams];
if (params == nil) {
fabricError = CHIP_ERROR_NO_MEMORY;
}
});

if (params == nil) {
[self controllerShuttingDown:controller];
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:fabricError];
}
return nil;
}

BOOL ok = [controller startup:params];
if (ok == NO) {
// TODO: get error from controller's startup.
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_INTERNAL];
}
return nil;
}

// TODO: Need better error propagation.
controller = [self maybeInitializeOTAProvider:controller];
if (controller == nil) {
if (error != nil) {
*error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_INTERNAL];
}
}
return controller;
return [self
_startDeviceController:startupParams
fabricChecker:^MTRDeviceControllerStartupParamsInternal *(FabricTable * fabricTable, CHIP_ERROR & fabricError) {
const FabricInfo * fabric = nullptr;
BOOL ok = [self findMatchingFabric:*fabricTable params:startupParams fabric:&fabric];
if (!ok) {
MTR_LOG_ERROR("Can't start on new fabric: fabric matching failed");
fabricError = CHIP_ERROR_INTERNAL;
return nil;
}

if (fabric != nullptr) {
MTR_LOG_ERROR("Can't start on new fabric that matches existing fabric");
fabricError = CHIP_ERROR_INCORRECT_STATE;
return nil;
}

auto * params = [[MTRDeviceControllerStartupParamsInternal alloc] initForNewFabric:fabricTable
keystore:self->_keystore
advertiseOperational:self.advertiseOperational
params:startupParams];
if (params == nil) {
fabricError = CHIP_ERROR_NO_MEMORY;
}
return params;
}
error:error];
}

- (MTRDeviceController * _Nullable)createController
Expand Down

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