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feat(GODT-2848): Decouple IMAP service from Event Loop

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The IMAP service no longer blocks the event loop from progressing. When
syncing the event loop continues as usual, allow other parts of the
bridge to continue updating.

Once the sync is complete, it resets the event id back to the last
handled id before sync started and then we play catch up.
This commit is contained in:
Leander Beernaert
2023-08-30 10:51:53 +02:00
parent dd7db00f74
commit a5a9bd762d
5 changed files with 372 additions and 46 deletions
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60
internal/services/imapservice/service.go
View File

@ -42,8 +42,7 @@ import (
type EventProvider interface {
userevents.Subscribable
PauseIMAP()
ResumeIMAP()
RewindEventID(ctx context.Context, eventID string) error
}
type Telemetry interface {
@ -92,7 +91,9 @@ type Service struct {
syncStateProvider *SyncState
syncReporter *syncReporter
syncConfigPath string
syncConfigPath string
lastHandledEventID string
isSyncing bool
}
func NewService(
@ -164,8 +165,9 @@ func (s *Service) Start(
ctx context.Context,
group *orderedtasks.OrderedCancelGroup,
syncRegulator syncservice.Regulator,
lastEventID string,
) error {
s.lastHandledEventID = lastEventID
{
syncStateProvider, err := NewSyncState(s.syncConfigPath)
if err != nil {
@ -276,7 +278,7 @@ func (s *Service) HandleRefreshEvent(ctx context.Context, _ proton.RefreshFlag)
return err
}
s.syncHandler.CancelAndWait()
s.cancelSync()
if err := s.removeConnectorsFromServer(ctx, s.connectors, true); err != nil {
return err
@ -353,7 +355,7 @@ func (s *Service) run(ctx context.Context) { //nolint gocyclo
case *resumeSyncReq:
s.log.Info("Resuming sync")
// Cancel previous run, if any, just in case.
s.syncHandler.CancelAndWait()
s.cancelSync()
s.startSyncing()
req.Reply(ctx, nil, nil)
case *getLabelsReq:
@ -401,7 +403,22 @@ func (s *Service) run(ctx context.Context) { //nolint gocyclo
}
s.log.Info("Sync complete, starting API event stream")
s.eventProvider.ResumeIMAP()
if err := s.eventProvider.RewindEventID(ctx, s.lastHandledEventID); err != nil {
if errors.Is(err, context.Canceled) {
continue
}
s.log.WithError(err).Error("Failed to rewind event service")
s.eventPublisher.PublishEvent(ctx, events.UserBadEvent{
UserID: s.identityState.UserID(),
OldEventID: "",
NewEventID: "",
EventInfo: "",
Error: fmt.Errorf("failed to rewind event loop: %w", err),
})
}
s.isSyncing = false
}
case request, ok := <-s.syncUpdateApplier.requestCh:
@ -423,7 +440,26 @@ func (s *Service) run(ctx context.Context) { //nolint gocyclo
continue
}
e.Consume(func(event proton.Event) error {
return eventHandler.OnEvent(ctx, event)
if s.isSyncing {
// We need to reset the sync if we receive a refresh event during a sync and update
// the last event id to avoid problems.
if event.Refresh&proton.RefreshMail != 0 {
if err := s.HandleRefreshEvent(ctx, 0); err != nil {
return err
}
s.lastHandledEventID = event.EventID
}
return nil
}
if err := eventHandler.OnEvent(ctx, event); err != nil {
return err
}
s.lastHandledEventID = event.EventID
return nil
})
case e, ok := <-s.eventWatcher.GetChannel():
if !ok {
@ -537,7 +573,7 @@ func (s *Service) setAddressMode(ctx context.Context, mode usertypes.AddressMode
s.log.Info("Setting Combined Address Mode")
}
s.syncHandler.CancelAndWait()
s.cancelSync()
if err := s.removeConnectorsFromServer(ctx, s.connectors, true); err != nil {
return err
@ -573,9 +609,15 @@ func (s *Service) setShowAllMail(v bool) {
}
func (s *Service) startSyncing() {
s.isSyncing = true
s.syncHandler.Execute(s.syncReporter, s.labels.GetLabelMap(), s.syncUpdateApplier, s.syncMessageBuilder, syncservice.DefaultRetryCoolDown)
}
func (s *Service) cancelSync() {
s.syncHandler.CancelAndWait()
s.isSyncing = false
}
type resyncReq struct{}
type cancelSyncReq struct{}

70
internal/services/userevents/service.go
View File

@ -34,6 +34,7 @@ import (
"github.com/ProtonMail/proton-bridge/v3/internal/events"
"github.com/ProtonMail/proton-bridge/v3/internal/network"
"github.com/ProtonMail/proton-bridge/v3/internal/services/orderedtasks"
"github.com/ProtonMail/proton-bridge/v3/pkg/cpc"
"github.com/bradenaw/juniper/xmaps"
"github.com/sirupsen/logrus"
)
@ -48,6 +49,7 @@ import (
// * UserUsedSpace
// By default this service starts paused, you need to call `Service.Resume` at least one time to begin event polling.
type Service struct {
cpc *cpc.CPC
userID string
eventSource EventSource
eventIDStore EventIDStore
@ -56,7 +58,6 @@ type Service struct {
timer *proton.Ticker
eventTimeout time.Duration
paused uint32
pausedIMAP uint32
panicHandler async.PanicHandler
subscriberList eventSubscriberList
@ -79,6 +80,7 @@ func NewService(
panicHandler async.PanicHandler,
) *Service {
return &Service{
cpc: cpc.NewCPC(),
userID: userID,
eventSource: eventSource,
eventIDStore: store,
@ -89,7 +91,6 @@ func NewService(
eventPublisher: eventPublisher,
timer: proton.NewTicker(pollPeriod, jitter, panicHandler),
paused: 1,
pausedIMAP: 1,
eventTimeout: eventTimeout,
panicHandler: panicHandler,
}
@ -121,12 +122,6 @@ func (s *Service) Pause() {
atomic.StoreUint32(&s.paused, 1)
}
// PauseIMAP special handler for the IMAP Service - Do Not Use.
func (s *Service) PauseIMAP() {
s.log.Info("Pausing from IMAP")
atomic.StoreUint32(&s.pausedIMAP, 1)
}
// PauseWithWaiter pauses the event polling and returns a waiter to notify when the last event has been published
// after the pause request.
func (s *Service) PauseWithWaiter() *EventPollWaiter {
@ -148,24 +143,23 @@ func (s *Service) Resume() {
atomic.StoreUint32(&s.paused, 0)
}
// ResumeIMAP special handler for the IMAP Service - Do Not Use.
func (s *Service) ResumeIMAP() {
s.log.Info("Resuming from IMAP")
atomic.StoreUint32(&s.pausedIMAP, 0)
}
// IsPaused return true if the service is paused.
func (s *Service) IsPaused() bool {
// We need to check both IMAP and service paused conditions here to determine if the service is
// paused. There can be instances where the sync from IMAP can overwrite a previous request to pause the loop once
// it is finished. To be addressed as part of GODT-2848.
return atomic.LoadUint32(&s.paused) == 1 || atomic.LoadUint32(&s.pausedIMAP) == 1
return atomic.LoadUint32(&s.paused) == 1
}
func (s *Service) Start(ctx context.Context, group *orderedtasks.OrderedCancelGroup) error {
// RewindEventID sets the event id as the next event to be polled.
func (s *Service) RewindEventID(ctx context.Context, id string) error {
_, err := s.cpc.Send(ctx, &rewindEventIDReq{eventID: id})
return err
}
// Start the event service and return the last EventID that was processed.
func (s *Service) Start(ctx context.Context, group *orderedtasks.OrderedCancelGroup) (string, error) {
lastEventID, err := s.eventIDStore.Load(ctx)
if err != nil {
return fmt.Errorf("failed to load last event id: %w", err)
return "", fmt.Errorf("failed to load last event id: %w", err)
}
if lastEventID == "" {
@ -176,11 +170,11 @@ func (s *Service) Start(ctx context.Context, group *orderedtasks.OrderedCancelGr
return eventSource.GetLatestEventID(ctx)
})
if err != nil {
return fmt.Errorf("failed to get latest event id: %w", err)
return "", fmt.Errorf("failed to get latest event id: %w", err)
}
if err := s.eventIDStore.Store(ctx, eventID); err != nil {
return fmt.Errorf("failed to store event in event id store: %v", err)
return "", fmt.Errorf("failed to store event in event id store: %v", err)
}
lastEventID = eventID
@ -190,11 +184,12 @@ func (s *Service) Start(ctx context.Context, group *orderedtasks.OrderedCancelGr
s.run(ctx, lastEventID)
})
return nil
return lastEventID, nil
}
func (s *Service) run(ctx context.Context, lastEventID string) {
s.log.Infof("Starting service Last EventID=%v", lastEventID)
defer s.cpc.Close()
defer s.timer.Stop()
defer s.log.Info("Exiting service")
defer s.Close()
@ -210,6 +205,26 @@ func (s *Service) run(ctx context.Context, lastEventID string) {
s.closePollWaiters()
continue
}
case r, ok := <-s.cpc.ReceiveCh():
if !ok {
return
}
rewind, ok := r.Value().(*rewindEventIDReq)
if !ok {
s.log.Errorf("Received unknown request")
continue
}
err := s.rewindEventLoop(ctx, rewind.eventID)
r.Reply(ctx, nil, err)
if err == nil {
lastEventID = rewind.eventID
}
continue
}
// Apply any pending subscription changes.
@ -402,6 +417,11 @@ func (s *Service) removeSubscription(subscription EventSubscriber) {
s.subscriberList.Remove(subscription)
}
func (s *Service) rewindEventLoop(ctx context.Context, id string) error {
s.log.WithField("eventID", id).Info("Event loop reset")
return s.eventIDStore.Store(ctx, id)
}
type pendingOp int
const (
@ -413,3 +433,7 @@ type pendingSubscription struct {
op pendingOp
sub EventSubscriber
}
type rewindEventIDReq struct {
eventID string
}

93
internal/services/userevents/service_test.go
View File

@ -76,9 +76,11 @@ func TestService_EventIDLoadStore(t *testing.T) {
time.Second,
async.NoopPanicHandler{},
)
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
service.ResumeIMAP()
group.Wait()
}
@ -131,9 +133,10 @@ func TestService_RetryEventOnNonCatastrophicFailure(t *testing.T) {
)
service.Subscribe(NewCallbackSubscriber("foo", EventHandler{MessageHandler: subscriber}))
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
service.ResumeIMAP()
group.Wait()
}
@ -194,9 +197,11 @@ func TestService_OnBadEventServiceIsPaused(t *testing.T) {
})
service.Subscribe(NewCallbackSubscriber("foo", EventHandler{MessageHandler: subscriber}))
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
service.ResumeIMAP()
group.Wait()
}
@ -251,9 +256,11 @@ func TestService_UnsubscribeDuringEventHandlingDoesNotCauseDeadlock(t *testing.T
})
service.Subscribe(subscription)
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
service.ResumeIMAP()
group.Wait()
}
@ -310,9 +317,11 @@ func TestService_UnsubscribeBeforeHandlingEventIsNotConsideredError(t *testing.T
})
service.Subscribe(subscription)
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
service.ResumeIMAP()
group.Wait()
}
@ -373,9 +382,69 @@ func TestService_WaitOnEventPublishAfterPause(t *testing.T) {
})
service.Subscribe(NewCallbackSubscriber("foo", EventHandler{MessageHandler: subscriber}))
require.NoError(t, service.Start(context.Background(), group))
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
service.Resume()
group.Wait()
}
func TestService_EventRewind(t *testing.T) {
group := orderedtasks.NewOrderedCancelGroup(async.NoopPanicHandler{})
mockCtrl := gomock.NewController(t)
eventPublisher := mocks2.NewMockEventPublisher(mockCtrl)
eventIDStore := mocks.NewMockEventIDStore(mockCtrl)
eventSource := mocks.NewMockEventSource(mockCtrl)
firstEventID := "EVENT01"
secondEventID := "EVENT02"
messageEvents := []proton.MessageEvent{
{
EventItem: proton.EventItem{ID: "Message"},
},
}
secondEvent := []proton.Event{{
EventID: secondEventID,
Messages: messageEvents,
}}
// Return Second Event from id store, but then reset to event 1
// Event id store expectations.
store1 := eventIDStore.EXPECT().Load(gomock.Any()).Times(1).Return(secondEventID, nil)
eventIDStore.EXPECT().Store(gomock.Any(), gomock.Eq(firstEventID)).Times(1).Return(nil).After(store1)
eventIDStore.EXPECT().Store(gomock.Any(), gomock.Eq(secondEventID)).Times(1).Return(nil)
// Event Source expectations.
eventSource.EXPECT().GetEvent(gomock.Any(), gomock.Eq(firstEventID)).MinTimes(1).DoAndReturn(
func(_ context.Context, _ string) ([]proton.Event, bool, error) {
group.Cancel()
return secondEvent, false, nil
},
)
// Subscriber expectations.
service := NewService(
"foo",
eventSource,
eventIDStore,
eventPublisher,
time.Millisecond,
time.Millisecond,
time.Second,
async.NoopPanicHandler{},
)
_, err := service.Start(context.Background(), group)
require.NoError(t, err)
go func() {
require.NoError(t, service.RewindEventID(context.Background(), firstEventID))
}()
service.Resume()
service.ResumeIMAP()
group.Wait()
}