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Add a timer to track whether we have received BDX init after a query …
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…image was successful

- Currently if an ota requester has a successful query image and an image it available but
  if for any reason, the ota requester doesn't send BDX init, the provider will be stuck until
  we reboot the resident. In order to have a fail safe, we are adding a timer that starts after
  query image returns image available and waits for a BDX init to come. In case BDX init doesn't
  come, it times out and resets state

- Add code to reset state if any API fails on the provider once we prepare for BDX transfer

- Stop polling when BDX transfer reset is called

- Return QueryImageResponse status busy instead of general failure if the sdk is busy and
  gets a sexond query image so accessory can handle the error correctly and retry until the
  sdk is done

- When we send a message, handle the case where if an error happens in sending the message
  close the exchange context and reset state. If the message is a status report and it
  succeeds, null out the exchange and reset state
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@nivi-apple
nivi-apple committed Feb 2, 2023
1 parent fbf362a commit 2f4baf2
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Showing 2 changed files with 99 additions and 28 deletions.
126 changes: 98 additions & 28 deletions src/darwin/Framework/CHIP/MTROTAProviderDelegateBridge.mm
View file
Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,14 @@
// TODO Expose a method onto the delegate to make that configurable.
constexpr uint32_t kMaxBdxBlockSize = 1024;
constexpr uint32_t kMaxBDXURILen = 256;

// Since the BDX timeout is 5 minutes and we are starting this after query image is available and before the BDX init comes,
// we just double the timeout to give enough time for the BDX init to come in a reasonable amount of time.
constexpr System::Clock::Timeout kBdxInitReceivedTimeout = System::Clock::Seconds16(10 * 60);

// Time in seconds after which the requestor should retry calling query image if busy status is receieved
constexpr uint32_t kDelayedActionTime = 120;

constexpr System::Clock::Timeout kBdxTimeout = System::Clock::Seconds16(5 * 60); // OTA Spec mandates >= 5 minutes
constexpr System::Clock::Timeout kBdxPollIntervalMs = System::Clock::Milliseconds32(50);
constexpr bdx::TransferRole kBdxRole = bdx::TransferRole::kSender;
Expand Down Expand Up @@ -89,13 +97,12 @@ CHIP_ERROR Shutdown()
VerifyOrReturnError(mExchangeMgr != nullptr, CHIP_ERROR_INCORRECT_STATE);

mExchangeMgr->UnregisterUnsolicitedMessageHandlerForProtocol(Protocols::BDX::Id);
ResetState();

mExchangeMgr = nullptr;
mSystemLayer = nullptr;
mDelegateNotificationQueue = nil;

ResetState();

return CHIP_NO_ERROR;
}

Expand All @@ -120,7 +127,39 @@ void SetDelegate(id<MTROTAProviderDelegate> delegate, dispatch_queue_t delegateN
}
}

void ResetState()
{
assertChipStackLockedByCurrentThread();
if (mSystemLayer) {
mSystemLayer->CancelTimer(HandleBdxInitReceivedTimeoutExpired, this);
}
// TODO: Check if this can be removed. It seems like we can close the exchange context and reset transfer regardless.
if (!mInitialized) {
return;
}
Responder::ResetTransfer();
++mTransferGeneration;
mFabricIndex.ClearValue();
mNodeId.ClearValue();

if (mExchangeCtx != nullptr) {
mExchangeCtx->Close();
mExchangeCtx = nullptr;
}

mInitialized = false;
}

private:
/**
* Timer callback called when we don't receive a BDX init within a reasonable time after a successful QueryImage response.
*/
static void HandleBdxInitReceivedTimeoutExpired(chip::System::Layer * systemLayer, void * state)
{
VerifyOrReturn(state != nullptr);
static_cast<BdxOTASender *>(state)->ResetState();
}

CHIP_ERROR OnMessageToSend(TransferSession::OutputEvent & event)
{
assertChipStackLockedByCurrentThread();
Expand All @@ -137,12 +176,40 @@ CHIP_ERROR OnMessageToSend(TransferSession::OutputEvent & event)
}

auto & msgTypeData = event.msgTypeData;
return mExchangeCtx->SendMessage(msgTypeData.ProtocolId, msgTypeData.MessageType, std::move(event.MsgData), sendFlags);
// If there's an error sending the message, close the exchange and call ResetState.
// TODO: If we can remove the !mInitialized check in ResetState(), just calling ResetState() will suffice here.
CHIP_ERROR err
= mExchangeCtx->SendMessage(msgTypeData.ProtocolId, msgTypeData.MessageType, std::move(event.MsgData), sendFlags);
if (err != CHIP_NO_ERROR) {
mExchangeCtx->Close();
mExchangeCtx = nullptr;
ResetState();
}
// If we sent a status report and it was successful, set the Exchange context to null and call ResetState.
if (event.msgTypeData.HasMessageType(Protocols::SecureChannel::MsgType::StatusReport) && err == CHIP_NO_ERROR) {
mExchangeCtx = nullptr;
ResetState();
}
return err;
}

bdx::StatusCode GetBdxStatusCodeFromChipError(CHIP_ERROR err) {
if (err == CHIP_ERROR_INCORRECT_STATE) {
return bdx::StatusCode::kUnexpectedMessage;
}
if (err == CHIP_ERROR_INVALID_ARGUMENT) {
return bdx::StatusCode::kBadMessageContents;
}
return bdx::StatusCode::kUnknown;
}

CHIP_ERROR OnTransferSessionBegin(TransferSession::OutputEvent & event)
{
assertChipStackLockedByCurrentThread();
// Once we receive the BDX init, cancel the BDX Init timeout and start the BDX session
if (mSystemLayer) {
mSystemLayer->CancelTimer(HandleBdxInitReceivedTimeoutExpired, this);
}

VerifyOrReturnError(mFabricIndex.HasValue(), CHIP_ERROR_INCORRECT_STATE);
VerifyOrReturnError(mNodeId.HasValue(), CHIP_ERROR_INCORRECT_STATE);
Expand All @@ -169,8 +236,9 @@ CHIP_ERROR OnTransferSessionBegin(TransferSession::OutputEvent & event)
}

if (error != nil) {
LogErrorOnFailure([MTRError errorToCHIPErrorCode:error]);
LogErrorOnFailure(mTransfer.AbortTransfer(bdx::StatusCode::kUnknown));
CHIP_ERROR err = [MTRError errorToCHIPErrorCode:error];
LogErrorOnFailure(err);
LogErrorOnFailure(mTransfer.AbortTransfer(GetBdxStatusCodeFromChipError(err)));
return;
}

Expand Down Expand Up @@ -328,6 +396,9 @@ void HandleTransferSessionOutput(TransferSession::OutputEvent & event) override
switch (event.EventType) {
case TransferSession::OutputEventType::kInitReceived:
err = OnTransferSessionBegin(event);
if (err != CHIP_NO_ERROR) {
LogErrorOnFailure(mTransfer.AbortTransfer(GetBdxStatusCodeFromChipError(err)));
}
break;
case TransferSession::OutputEventType::kStatusReceived:
ChipLogError(BDX, "Got StatusReport %x", static_cast<uint16_t>(event.statusData.statusCode));
Expand Down Expand Up @@ -370,6 +441,10 @@ CHIP_ERROR ConfigureState(chip::FabricIndex fabricIndex, chip::NodeId nodeId)
ResetState();
}

// Start a timer to track whether we receive a BDX init after a successful query image in a reasonable amount of time
CHIP_ERROR err = mSystemLayer->StartTimer(kBdxInitReceivedTimeout, HandleBdxInitReceivedTimeoutExpired, this);
VerifyOrReturnError(err == CHIP_NO_ERROR, CHIP_ERROR_INCORRECT_STATE);

mFabricIndex.SetValue(fabricIndex);
mNodeId.SetValue(nodeId);

Expand All @@ -378,27 +453,6 @@ CHIP_ERROR ConfigureState(chip::FabricIndex fabricIndex, chip::NodeId nodeId)
return CHIP_NO_ERROR;
}

void ResetState()
{
assertChipStackLockedByCurrentThread();

if (!mInitialized) {
return;
}

Responder::ResetTransfer();
++mTransferGeneration;
mFabricIndex.ClearValue();
mNodeId.ClearValue();

if (mExchangeCtx != nullptr) {
mExchangeCtx->Close();
mExchangeCtx = nullptr;
}

mInitialized = false;
}

bool mInitialized = false;
Optional<FabricIndex> mFabricIndex;
Optional<NodeId> mNodeId;
Expand Down Expand Up @@ -574,11 +628,19 @@ bool GetPeerNodeInfo(CommandHandler * commandHandler, const ConcreteCommandPath
CHIP_ERROR err = gOtaSender.PrepareForTransfer(fabricIndex, nodeId);
if (CHIP_NO_ERROR != err) {
LogErrorOnFailure(err);
if (err == CHIP_ERROR_BUSY) {
Commands::QueryImageResponse::Type busyResponse;
busyResponse.status = static_cast<OTAQueryStatus>(MTROTASoftwareUpdateProviderOTAQueryStatusBusy);
busyResponse.delayedActionTime.SetValue(response.delayedActionTime.ValueOr(kDelayedActionTime));
handler->AddResponse(cachedCommandPath, busyResponse);
handle.Release();
return;
}
handler->AddStatus(cachedCommandPath, Protocols::InteractionModel::Status::Failure);
handle.Release();
gOtaSender.ResetState();
return;
}

auto targetNodeId
= handler->GetExchangeContext()->GetSessionHandle()->AsSecureSession()->GetLocalScopedNodeId();

Expand All @@ -589,6 +651,7 @@ bool GetPeerNodeInfo(CommandHandler * commandHandler, const ConcreteCommandPath
LogErrorOnFailure(err);
handler->AddStatus(cachedCommandPath, Protocols::InteractionModel::Status::Failure);
handle.Release();
gOtaSender.ResetState();
return;
}

Expand All @@ -597,9 +660,16 @@ bool GetPeerNodeInfo(CommandHandler * commandHandler, const ConcreteCommandPath
handle.Release();
return;
}

if (!isBDXProtocolSupported) {
Commands::QueryImageResponse::Type protocolNotSupportedResponse;
protocolNotSupportedResponse.status = static_cast<OTAQueryStatus>(MTROTASoftwareUpdateProviderOTAQueryStatusBusy);
handler->AddResponse(cachedCommandPath, protocolNotSupportedResponse);
} else {
handler->AddResponse(cachedCommandPath, response);
}
handler->AddResponse(cachedCommandPath, response);
handle.Release();
gOtaSender.ResetState();
}

errorHandler:^(NSError *) {
Expand Down
1 change: 1 addition & 0 deletions src/protocols/bdx/TransferFacilitator.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,7 @@ CHIP_ERROR Responder::PrepareForTransfer(System::Layer * layer, TransferRole rol
void Responder::ResetTransfer()
{
mTransfer.Reset();
mStopPolling = true;
}

CHIP_ERROR Initiator::InitiateTransfer(System::Layer * layer, TransferRole role, const TransferSession::TransferInitData & initData,
Expand Down

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