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deviceSubscription.go
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deviceSubscription.go
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package service
import (
"context"
"fmt"
"strings"
"github.com/plgd-dev/cloud/cloud2cloud-connector/events"
"github.com/plgd-dev/cloud/cloud2cloud-connector/store"
raCqrs "github.com/plgd-dev/cloud/resource-aggregate/cqrs"
pbCQRS "github.com/plgd-dev/cloud/resource-aggregate/pb"
pbRA "github.com/plgd-dev/cloud/resource-aggregate/pb"
"github.com/plgd-dev/go-coap/v2/message"
"github.com/plgd-dev/kit/codec/cbor"
"github.com/plgd-dev/kit/log"
kitNetGrpc "github.com/plgd-dev/kit/net/grpc"
kitHttp "github.com/plgd-dev/kit/net/http"
"github.com/plgd-dev/sdk/schema/cloud"
"github.com/gofrs/uuid"
cache "github.com/patrickmn/go-cache"
)
func (s *SubscriptionManager) SubscribeToDevice(ctx context.Context, deviceID string, linkedAccount store.LinkedAccount, linkedCloud store.LinkedCloud) error {
if _, loaded := s.store.LoadDeviceSubscription(linkedAccount.LinkedCloudID, linkedAccount.ID, deviceID); loaded {
return nil
}
signingSecret, err := generateRandomString(32)
if err != nil {
return fmt.Errorf("cannot generate signingSecret for device subscription: %w", err)
}
corID, err := uuid.NewV4()
if err != nil {
return fmt.Errorf("cannot generate correlationID for devices subscription: %w", err)
}
correlationID := corID.String()
sub := Subscription{
Type: Type_Device,
LinkedAccountID: linkedAccount.ID,
DeviceID: deviceID,
SigningSecret: signingSecret,
LinkedCloudID: linkedCloud.ID,
CorrelationID: correlationID,
}
data := subscriptionData{
linkedAccount: linkedAccount,
linkedCloud: linkedCloud,
subscription: sub,
}
err = s.cache.Add(correlationID, data, cache.DefaultExpiration)
if err != nil {
return fmt.Errorf("cannot cache subscription for device subscriptions: %w", err)
}
sub.ID, err = s.subscribeToDevice(ctx, linkedAccount, linkedCloud, correlationID, signingSecret, deviceID)
if err != nil {
s.cache.Delete(correlationID)
return fmt.Errorf("cannot subscribe to device %v: %w", deviceID, err)
}
_, _, err = s.store.LoadOrCreateSubscription(sub)
if err != nil {
cancelDeviceSubscription(ctx, linkedAccount, linkedCloud, deviceID, sub.ID)
return fmt.Errorf("cannot store subscription to DB: %w", err)
}
err = s.devicesSubscription.Add(deviceID, linkedAccount, linkedCloud)
if err != nil {
return fmt.Errorf("cannot register device %v to resource projection: %w", deviceID, err)
}
return nil
}
func (s *SubscriptionManager) subscribeToDevice(ctx context.Context, linkedAccount store.LinkedAccount, linkedCloud store.LinkedCloud, correlationID, signingSecret, deviceID string) (string, error) {
resp, err := subscribe(ctx, "/devices/"+deviceID+"/subscriptions", correlationID, events.SubscriptionRequest{
URL: s.eventsURL,
EventTypes: []events.EventType{
events.EventType_ResourcesPublished,
events.EventType_ResourcesUnpublished,
},
SigningSecret: signingSecret,
}, linkedAccount, linkedCloud)
if err != nil {
return "", fmt.Errorf("cannot subscribe to device %v for %v: %w", deviceID, linkedAccount.ID, err)
}
return resp.SubscriptionId, nil
}
func cancelDeviceSubscription(ctx context.Context, linkedAccount store.LinkedAccount, linkedCloud store.LinkedCloud, deviceID, subscriptionID string) error {
err := cancelSubscription(ctx, "/devices/"+deviceID+"/subscriptions/"+subscriptionID, linkedAccount, linkedCloud)
if err != nil {
return fmt.Errorf("cannot cancel device subscription for %v: %w", linkedAccount.ID, err)
}
return nil
}
func (s *SubscriptionManager) updateCloudStatus(ctx context.Context, deviceID string, online bool, authContext pbCQRS.AuthorizationContext, cmdMetadata pbCQRS.CommandMetadata) error {
status := cloud.Status{
ResourceTypes: cloud.StatusResourceTypes,
Interfaces: cloud.StatusInterfaces,
Online: online,
}
data, err := cbor.Encode(status)
if err != nil {
return err
}
request := pbRA.NotifyResourceChangedRequest{
ResourceId: raCqrs.MakeResourceId(deviceID, cloud.StatusHref),
Content: &pbRA.Content{
ContentType: message.AppOcfCbor.String(),
CoapContentFormat: int32(message.AppOcfCbor),
Data: data,
},
Status: pbRA.Status_OK,
CommandMetadata: &cmdMetadata,
AuthorizationContext: &authContext,
}
_, err = s.raClient.NotifyResourceChanged(ctx, &request)
return err
}
func trimDeviceIDFromHref(deviceID, href string) string {
if strings.HasPrefix(href, "/"+deviceID+"/") {
href = strings.TrimPrefix(href, "/"+deviceID)
}
return href
}
// HandleResourcesPublished publish resources to resource aggregate and subscribes to resources.
func (s *SubscriptionManager) HandleResourcesPublished(ctx context.Context, d subscriptionData, header events.EventHeader, links events.ResourcesPublished) error {
var errors []error
for _, link := range links {
deviceID := d.subscription.DeviceID
link.DeviceID = deviceID
endpoints := make([]*pbRA.EndpointInformation, 0, 4)
for _, endpoint := range link.GetEndpoints() {
endpoints = append(endpoints, &pbRA.EndpointInformation{
Endpoint: endpoint.URI,
Priority: int64(endpoint.Priority),
})
}
href := trimDeviceIDFromHref(link.DeviceID, link.Href)
resourceId := raCqrs.MakeResourceId(link.DeviceID, kitHttp.CanonicalHref(href))
_, err := s.raClient.PublishResource(kitNetGrpc.CtxWithToken(ctx, d.linkedAccount.TargetCloud.AccessToken.String()), &pbRA.PublishResourceRequest{
AuthorizationContext: &pbCQRS.AuthorizationContext{
DeviceId: link.DeviceID,
},
ResourceId: resourceId,
Resource: &pbRA.Resource{
Id: resourceId,
Href: href,
ResourceTypes: link.ResourceTypes,
Interfaces: link.Interfaces,
DeviceId: link.DeviceID,
InstanceId: link.InstanceID,
Anchor: link.Anchor,
Policies: &pbRA.Policies{BitFlags: int32(link.Policy.BitMask)},
Title: link.Title,
SupportedContentTypes: link.SupportedContentTypes,
EndpointInformations: endpoints,
},
CommandMetadata: &pbCQRS.CommandMetadata{
ConnectionId: d.linkedAccount.ID + "." + d.subscription.ID,
Sequence: header.SequenceNumber,
},
})
if err != nil {
errors = append(errors, fmt.Errorf("cannot publish resource: %w", err))
continue
}
if d.linkedCloud.SupportedSubscriptionsEvents.NeedPullResources() {
continue
}
s.triggerTask(Task{
taskType: TaskType_SubscribeToResource,
linkedAccount: d.linkedAccount,
linkedCloud: d.linkedCloud,
deviceID: deviceID,
href: href,
})
}
if len(errors) > 0 {
return fmt.Errorf("%v", errors)
}
return nil
}
// HandleResourcesUnpublished unpublish resources from resource aggregate and cancel resources subscriptions.
func (s *SubscriptionManager) HandleResourcesUnpublished(ctx context.Context, d subscriptionData, header events.EventHeader, links events.ResourcesUnpublished) error {
var errors []error
for _, link := range links {
link.DeviceID = d.subscription.DeviceID
href := trimDeviceIDFromHref(link.DeviceID, link.Href)
_, err := s.raClient.UnpublishResource(kitNetGrpc.CtxWithToken(ctx, d.linkedAccount.TargetCloud.AccessToken.String()), &pbRA.UnpublishResourceRequest{
AuthorizationContext: &pbCQRS.AuthorizationContext{
DeviceId: link.DeviceID,
},
ResourceId: raCqrs.MakeResourceId(link.GetDeviceID(), kitHttp.CanonicalHref(href)),
CommandMetadata: &pbCQRS.CommandMetadata{
ConnectionId: d.linkedAccount.ID + "." + d.subscription.ID,
Sequence: header.SequenceNumber,
},
})
if err != nil {
errors = append(errors, fmt.Errorf("cannot unpublish resource: %w", err))
}
_, ok := s.store.PullOutResource(d.linkedAccount.LinkedCloudID, d.linkedAccount.ID, link.DeviceID, href)
if !ok {
log.Debugf("HandleResourcesUnpublished: cannot remove device %v resource %v subscription: not found", link.DeviceID, href)
}
s.cache.Delete(header.CorrelationID)
}
if len(errors) > 0 {
return fmt.Errorf("%v", errors)
}
return nil
}
// HandleDeviceEvent handles device events.
func (s *SubscriptionManager) HandleDeviceEvent(ctx context.Context, header events.EventHeader, body []byte, subscriptionData subscriptionData) error {
contentReader, err := header.GetContentDecoder()
if err != nil {
return fmt.Errorf("cannot get content reader: %w", err)
}
switch header.EventType {
case events.EventType_ResourcesPublished:
var links events.ResourcesPublished
err := contentReader(body, &links)
if err != nil {
return fmt.Errorf("cannot decode device event %v: %w", header.EventType, err)
}
return s.HandleResourcesPublished(ctx, subscriptionData, header, links)
case events.EventType_ResourcesUnpublished:
var links events.ResourcesUnpublished
err := contentReader(body, &links)
if err != nil {
return fmt.Errorf("cannot decode device event %v: %w", header.EventType, err)
}
return s.HandleResourcesUnpublished(ctx, subscriptionData, header, links)
}
return fmt.Errorf("cannot handle device: unsupported Event-Type %v", header.EventType)
}