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subscription.go
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subscription.go
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package client
import (
"context"
"errors"
"fmt"
"io"
"sort"
"strings"
"time"
"github.com/hashicorp/go-multierror"
"github.com/plgd-dev/hub/v2/grpc-gateway/pb"
grpcSubscription "github.com/plgd-dev/hub/v2/grpc-gateway/subscription"
isEvents "github.com/plgd-dev/hub/v2/identity-store/events"
"github.com/plgd-dev/hub/v2/resource-aggregate/commands"
"github.com/plgd-dev/hub/v2/test/config"
kitStrings "github.com/plgd-dev/kit/v2/strings"
"go.uber.org/atomic"
"golang.org/x/exp/slices"
)
type SendEventFunc = func(e *pb.Event) error
type deduplicateEvent struct {
version uint64
validUntil *time.Time
}
type Sub struct {
ctx atomic.Value
filter grpcSubscription.FilterBitmask
send SendEventFunc
req *pb.SubscribeToEvents_CreateSubscription
correlationID string
id string
expiration time.Duration
devicesInitialized map[string]bool
filteredDeviceIDs kitStrings.Set
filteredResourceIDs kitStrings.Set
grpcClient pb.GrpcGatewayClient
deduplicateEvents map[string]deduplicateEvent
}
func isFilteredDevice(filteredDeviceIDs kitStrings.Set, deviceID string) bool {
if len(filteredDeviceIDs) == 0 {
return true
}
return filteredDeviceIDs.HasOneOf(deviceID)
}
func (s *Sub) deinitDeviceLocked(deviceID string) {
delete(s.devicesInitialized, deviceID)
}
func (s *Sub) SetContext(ctx context.Context) {
s.ctx.Store(ctx)
}
func (s *Sub) Context() context.Context {
return s.ctx.Load().(context.Context)
}
func (s *Sub) initDevices() ([]*pb.Device, error) {
devicesClient, err := s.grpcClient.GetDevices(s.Context(), &pb.GetDevicesRequest{
DeviceIdFilter: s.req.GetDeviceIdFilter(),
})
errFunc := func(err error) error {
return fmt.Errorf("cannot init devices events for '%v': %w", s.req.GetDeviceIdFilter(), err)
}
if err != nil {
return nil, errFunc(fmt.Errorf("cannot get devices: %w", err))
}
devices := make([]*pb.Device, 0, 32)
for {
recv, err := devicesClient.Recv()
if errors.Is(err, io.EOF) {
return devices, nil
}
if err != nil {
return nil, errFunc(fmt.Errorf("cannot receive resource: %w", err))
}
devices = append(devices, recv)
}
}
type devicesByHub struct {
deviceIDs []string
hubID string
}
func convDevicesToDevicesByHub(devices []*pb.Device) []devicesByHub {
list := make([]devicesByHub, 0, 32)
for _, d := range devices {
sort.Slice(list, func(i, j int) bool {
return list[i].hubID < list[j].hubID
})
i := slices.IndexFunc[[]devicesByHub](list, func(elem devicesByHub) bool {
return strings.Compare(d.GetData().GetEventMetadata().GetHubId(), elem.hubID) == 0
})
if i != -1 {
list[i].deviceIDs = append(list[i].deviceIDs, d.GetId())
continue
}
list = append(list, devicesByHub{
deviceIDs: []string{d.GetId()},
hubID: d.GetData().GetEventMetadata().GetHubId(),
})
}
return list
}
func (s *Sub) initSubscription() ([]devicesByHub, error) {
devices, err := s.initDevices()
if err != nil {
return nil, err
}
hubs := convDevicesToDevicesByHub(devices)
filteredDevicesByHUb := make([]devicesByHub, 0, len(hubs))
for idx := range hubs {
hubs[idx].deviceIDs = s.initEventSubscriptions(hubs[idx].deviceIDs)
if len(hubs[idx].deviceIDs) > 0 {
filteredDevicesByHUb = append(filteredDevicesByHUb, hubs[idx])
}
}
return filteredDevicesByHUb, nil
}
func (s *Sub) initEvents(devices []string, hubID string) error {
initEventFuncs := []func(devices []string, hubID string, validUntil *time.Time) error{
s.sendDevicesRegistered,
s.initDeviceMetadataUpdated,
s.initResourcesPublished,
s.initResourceChanged,
s.initPendingCommands,
}
var errors *multierror.Error
var validUntil time.Time
start := time.Now()
for _, f := range initEventFuncs {
err := f(devices, hubID, &validUntil)
if err != nil {
errors = multierror.Append(errors, err)
}
}
now := time.Now()
validUntil = now.Add(now.Sub(start) + s.expiration)
return errors.ErrorOrNil()
}
func (s *Sub) Init(id string) error {
s.id = id
hubs, err := s.initSubscription()
if err != nil {
return err
}
if len(hubs) == 0 {
return s.initEvents([]string{}, "")
}
for _, h := range hubs {
err = s.initEvents(h.deviceIDs, h.hubID)
if err != nil {
return err
}
}
return nil
}
func (s *Sub) filterDevices(devices []string) []string {
filteredDevices := make([]string, 0, len(devices))
for _, d := range devices {
if isFilteredDevice(s.filteredDeviceIDs, d) {
filteredDevices = append(filteredDevices, d)
}
}
return filteredDevices
}
func (s *Sub) initEventSubscriptions(devices []string) []string {
filteredDevices := make([]string, 0, len(devices))
for _, deviceID := range devices {
if _, ok := s.devicesInitialized[deviceID]; ok {
continue
}
s.devicesInitialized[deviceID] = true
filteredDevices = append(filteredDevices, deviceID)
}
return filteredDevices
}
func (s *Sub) sendDevicesRegistered(deviceIDs []string, hubID string, _ *time.Time) error {
if !grpcSubscription.IsFilteredBit(s.filter, grpcSubscription.FilterBitmaskDeviceRegistered) {
return nil
}
var em *isEvents.EventMetadata
if hubID != "" {
em = &isEvents.EventMetadata{
HubId: hubID,
}
}
err := s.send(&pb.Event{
SubscriptionId: s.id,
CorrelationId: s.correlationID,
Type: &pb.Event_DeviceRegistered_{
DeviceRegistered: &pb.Event_DeviceRegistered{
DeviceIds: deviceIDs,
EventMetadata: em,
},
},
})
if err != nil {
return fmt.Errorf("cannot send devices registered for devices %v: %w", deviceIDs, err)
}
return nil
}
func (s *Sub) initResourceChanged(deviceIDs []string, _ string, validUntil *time.Time) error {
if !grpcSubscription.IsFilteredBit(s.filter, grpcSubscription.FilterBitmaskResourceChanged) {
return nil
}
errFunc := func(err error) error {
return fmt.Errorf("cannot init resources changed events for devices %v: %w", deviceIDs, err)
}
deviceIdFilter := deviceIDs
if len(s.req.GetResourceIdFilter()) > 0 {
deviceIdFilter = nil
}
resourcesClient, err := s.grpcClient.GetResources(s.Context(), &pb.GetResourcesRequest{
DeviceIdFilter: deviceIdFilter,
HttpResourceIdFilter: s.req.GetHttpResourceIdFilter(),
ResourceIdFilter: s.req.GetResourceIdFilter(),
})
if err != nil {
return errFunc(fmt.Errorf("cannot get resources: %w", err))
}
for {
recv, err := resourcesClient.Recv()
if errors.Is(err, io.EOF) {
return nil
}
if err != nil {
return errFunc(fmt.Errorf("cannot receive resource: %w", err))
}
if recv.GetData() == nil {
// event doesn't contains data - resource is not initialized yet
continue
}
ev := &pb.Event{
SubscriptionId: s.id,
CorrelationId: s.correlationID,
Type: &pb.Event_ResourceChanged{
ResourceChanged: recv.GetData(),
},
}
s.fillDeduplicateEvent(ev.GetResourceChanged(), validUntil)
err = s.send(ev)
if err != nil {
return errFunc(fmt.Errorf("cannot send a resource: %w", err))
}
}
}
func (s *Sub) initDeviceMetadataUpdated(deviceIDs []string, _ string, validUntil *time.Time) error {
if !grpcSubscription.IsFilteredBit(s.filter, grpcSubscription.FilterBitmaskDeviceMetadataUpdated) {
return nil
}
errFunc := func(err error) error {
return fmt.Errorf("cannot init devices metadata for devices %v: %w", deviceIDs, err)
}
linksClient, err := s.grpcClient.GetDevicesMetadata(s.Context(), &pb.GetDevicesMetadataRequest{
DeviceIdFilter: deviceIDs,
})
if err != nil {
return errFunc(fmt.Errorf("cannot get devices metadata: %w", err))
}
for {
recv, err := linksClient.Recv()
if errors.Is(err, io.EOF) {
return nil
}
if err != nil {
return errFunc(fmt.Errorf("cannot receive devices metadata: %w", err))
}
ev := &pb.Event{
SubscriptionId: s.id,
CorrelationId: s.correlationID,
Type: &pb.Event_DeviceMetadataUpdated{
DeviceMetadataUpdated: recv,
},
}
s.fillDeduplicateEvent(ev.GetDeviceMetadataUpdated(), validUntil)
err = s.send(ev)
if err != nil {
return errFunc(fmt.Errorf("cannot send a devices metadata: %w", err))
}
}
}
func (s *Sub) initResourcesPublished(deviceIDs []string, _ string, validUntil *time.Time) error {
if !grpcSubscription.IsFilteredBit(s.filter, grpcSubscription.FilterBitmaskResourcesPublished) {
return nil
}
errFunc := func(err error) error {
return fmt.Errorf("cannot init resources published events for devices %v: %w", deviceIDs, err)
}
linksClient, err := s.grpcClient.GetResourceLinks(s.Context(), &pb.GetResourceLinksRequest{
DeviceIdFilter: deviceIDs,
})
if err != nil {
return errFunc(fmt.Errorf("cannot get resource links: %w", err))
}
for {
recv, err := linksClient.Recv()
if errors.Is(err, io.EOF) {
return nil
}
if err != nil {
return errFunc(fmt.Errorf("cannot receive resource links: %w", err))
}
ev := &pb.Event{
SubscriptionId: s.id,
CorrelationId: s.correlationID,
Type: &pb.Event_ResourcePublished{
ResourcePublished: recv,
},
}
s.fillDeduplicateEvent(ev.GetResourcePublished(), validUntil)
err = s.send(ev)
if err != nil {
return errFunc(fmt.Errorf("cannot send a resource links: %w", err))
}
}
}
func pendingCommandToEvent(cmd *pb.PendingCommand) (*pb.Event, event) {
switch c := cmd.GetCommand().(type) {
case *pb.PendingCommand_DeviceMetadataUpdatePending:
return &pb.Event{
Type: &pb.Event_DeviceMetadataUpdatePending{
DeviceMetadataUpdatePending: c.DeviceMetadataUpdatePending,
},
}, c.DeviceMetadataUpdatePending
case *pb.PendingCommand_ResourceCreatePending:
return &pb.Event{
Type: &pb.Event_ResourceCreatePending{
ResourceCreatePending: c.ResourceCreatePending,
},
}, c.ResourceCreatePending
case *pb.PendingCommand_ResourceDeletePending:
return &pb.Event{
Type: &pb.Event_ResourceDeletePending{
ResourceDeletePending: c.ResourceDeletePending,
},
}, c.ResourceDeletePending
case *pb.PendingCommand_ResourceRetrievePending:
return &pb.Event{
Type: &pb.Event_ResourceRetrievePending{
ResourceRetrievePending: c.ResourceRetrievePending,
},
}, c.ResourceRetrievePending
case *pb.PendingCommand_ResourceUpdatePending:
return &pb.Event{
Type: &pb.Event_ResourceUpdatePending{
ResourceUpdatePending: c.ResourceUpdatePending,
},
}, c.ResourceUpdatePending
}
return nil, nil
}
type event = interface {
EventType() string
AggregateID() string
Version() uint64
}
func deduplicateEventKey(ev event) string {
return ev.AggregateID() + ev.EventType()
}
func (s *Sub) isDuplicatedEvent(ev event) bool {
key := deduplicateEventKey(ev)
dedupEvent, ok := s.deduplicateEvents[key]
if !ok {
return false
}
if dedupEvent.version >= ev.Version() {
return true
}
return false
}
func (s *Sub) fillDeduplicateEvent(v event, validUntil *time.Time) {
key := deduplicateEventKey(v)
dedupEvent, ok := s.deduplicateEvents[key]
if !ok || dedupEvent.version < v.Version() {
s.deduplicateEvents[key] = deduplicateEvent{
version: v.Version(),
validUntil: validUntil,
}
}
}
func (s *Sub) initPendingCommands(deviceIDs []string, _ string, validUntil *time.Time) error {
if !grpcSubscription.IsFilteredBit(s.filter,
grpcSubscription.FilterBitmaskDeviceMetadataUpdatePending|
grpcSubscription.FilterBitmaskResourceCreatePending|
grpcSubscription.FilterBitmaskResourceRetrievePending|
grpcSubscription.FilterBitmaskResourceUpdatePending|
grpcSubscription.FilterBitmaskResourceDeletePending) {
return nil
}
errFunc := func(err error) error {
return fmt.Errorf("cannot init pending commands for devices %v: %w", deviceIDs, err)
}
deviceIdFilter := deviceIDs
if len(s.req.GetResourceIdFilter()) > 0 || len(s.req.GetHttpResourceIdFilter()) > 0 {
deviceIdFilter = nil
}
pendingCommands, err := s.grpcClient.GetPendingCommands(s.Context(), &pb.GetPendingCommandsRequest{
DeviceIdFilter: deviceIdFilter,
ResourceIdFilter: s.req.GetResourceIdFilter(),
HttpResourceIdFilter: s.req.GetHttpResourceIdFilter(),
CommandFilter: grpcSubscription.BitmaskToFilterPendingsCommands(s.filter),
})
if err != nil {
return errFunc(fmt.Errorf("cannot get pending commands: %w", err))
}
for {
recv, err := pendingCommands.Recv()
if errors.Is(err, io.EOF) {
return nil
}
if err != nil {
return errFunc(fmt.Errorf("cannot receive pending command: %w", err))
}
ev, deduplicateEvent := pendingCommandToEvent(recv)
if ev == nil {
continue
}
ev.CorrelationId = s.correlationID
ev.SubscriptionId = s.id
s.fillDeduplicateEvent(deduplicateEvent, validUntil)
err = s.send(ev)
if err != nil {
return errFunc(fmt.Errorf("cannot send a pending command: %w", err))
}
}
}
func (s *Sub) onRegisteredEvent(e *pb.Event_DeviceRegistered) error {
devices := s.filterDevices(e.GetDeviceIds())
devices = s.initEventSubscriptions(devices)
if len(devices) == 0 {
return nil
}
return s.initEvents(devices, e.GetEventMetadata().GetHubId())
}
func (s *Sub) onUnregisteredEvent(e *pb.Event_DeviceUnregistered) error {
devices := s.filterDevices(e.GetDeviceIds())
if len(devices) == 0 {
return nil
}
for _, deviceID := range devices {
s.deinitDeviceLocked(deviceID)
}
if !grpcSubscription.IsFilteredBit(s.filter, s.filter&grpcSubscription.FilterBitmaskDeviceUnregistered) {
return nil
}
err := s.send(&pb.Event{
SubscriptionId: s.id,
CorrelationId: s.correlationID,
Type: &pb.Event_DeviceUnregistered_{
DeviceUnregistered: &pb.Event_DeviceUnregistered{
DeviceIds: devices,
EventMetadata: &isEvents.EventMetadata{
HubId: config.HubID(),
},
},
},
})
if err != nil {
return fmt.Errorf("cannot send device unregistered event for devices %v: %w", devices, err)
}
return nil
}
func (s *Sub) dropExpiredDeduplicateEvents(now time.Time) {
for key, val := range s.deduplicateEvents {
if val.validUntil == nil || now.After(*val.validUntil) {
delete(s.deduplicateEvents, key)
}
}
}
func (s *Sub) DropDeduplicateEvents() {
s.deduplicateEvents = make(map[string]deduplicateEvent)
}
func (s *Sub) ProcessEvent(e *pb.Event) error {
s.dropExpiredDeduplicateEvents(time.Now())
var evToCheck event
switch ev := e.GetType().(type) {
case (*pb.Event_DeviceRegistered_):
return s.onRegisteredEvent(ev.DeviceRegistered)
case (*pb.Event_DeviceUnregistered_):
return s.onUnregisteredEvent(ev.DeviceUnregistered)
case (*pb.Event_ResourcePublished):
evToCheck = ev.ResourcePublished
case (*pb.Event_ResourceChanged):
evToCheck = ev.ResourceChanged
case (*pb.Event_ResourceUpdatePending):
evToCheck = ev.ResourceUpdatePending
case (*pb.Event_ResourceRetrievePending):
evToCheck = ev.ResourceRetrievePending
case (*pb.Event_ResourceDeletePending):
evToCheck = ev.ResourceDeletePending
case (*pb.Event_ResourceCreatePending):
evToCheck = ev.ResourceCreatePending
case (*pb.Event_DeviceMetadataUpdatePending):
evToCheck = ev.DeviceMetadataUpdatePending
default:
return s.send(e)
}
if evToCheck != nil && s.isDuplicatedEvent(evToCheck) {
return nil
}
return s.send(e)
}
func NewSub(ctx context.Context, grpcClient pb.GrpcGatewayClient, send SendEventFunc, correlationID string, expiration time.Duration, req *pb.SubscribeToEvents_CreateSubscription) *Sub {
bitmask := grpcSubscription.EventsFilterToBitmask(req.GetEventFilter())
filteredResourceIDs := kitStrings.MakeSet()
filteredDeviceIDs := kitStrings.MakeSet(req.GetDeviceIdFilter()...)
for _, r := range req.GetResourceIdFilter() {
v := r.GetResourceId()
if v == nil {
continue
}
filteredResourceIDs.Add(v.ToUUID().String())
filteredDeviceIDs.Add(v.GetDeviceId())
if len(req.GetEventFilter()) > 0 {
if bitmask&(grpcSubscription.FilterBitmaskDeviceMetadataUpdatePending|grpcSubscription.FilterBitmaskDeviceMetadataUpdated) != 0 {
filteredResourceIDs.Add(commands.MakeStatusResourceUUID(v.GetDeviceId()).String())
}
if bitmask&(grpcSubscription.FilterBitmaskResourcesPublished|grpcSubscription.FilterBitmaskResourcesUnpublished) != 0 {
filteredResourceIDs.Add(commands.MakeLinksResourceUUID(v.GetDeviceId()).String())
}
}
}
if expiration <= 0 {
expiration = time.Second * 60
}
var ctxAtomic atomic.Value
ctxAtomic.Store(ctx)
return &Sub{
ctx: ctxAtomic,
filter: grpcSubscription.EventsFilterToBitmask(req.GetEventFilter()),
send: send,
req: req,
filteredDeviceIDs: kitStrings.MakeSet(req.GetDeviceIdFilter()...),
filteredResourceIDs: filteredResourceIDs,
grpcClient: grpcClient,
correlationID: correlationID,
expiration: expiration,
deduplicateEvents: make(map[string]deduplicateEvent),
devicesInitialized: make(map[string]bool),
}
}