/
observeDeviceResources.go
88 lines (74 loc) · 2.29 KB
/
observeDeviceResources.go
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package client
import (
"context"
"github.com/gofrs/uuid"
"github.com/plgd-dev/cloud/grpc-gateway/pb"
)
type DeviceResourcesObservationEvent_type uint8
const DeviceResourcesObservationEvent_ADDED DeviceResourcesObservationEvent_type = 0
const DeviceResourcesObservationEvent_REMOVED DeviceResourcesObservationEvent_type = 1
type DeviceResourcesObservationEvent struct {
Links []*pb.ResourceLink
Event DeviceResourcesObservationEvent_type
}
type DeviceResourcesObservationHandler = interface {
Handle(ctx context.Context, event DeviceResourcesObservationEvent) error
OnClose()
Error(err error)
}
type deviceResourcesObservation struct {
h DeviceResourcesObservationHandler
removeSubscription func()
}
func (o *deviceResourcesObservation) HandleResourcePublished(ctx context.Context, val *pb.Event_ResourcePublished) error {
return o.h.Handle(ctx, DeviceResourcesObservationEvent{
Links: val.GetLinks(),
Event: DeviceResourcesObservationEvent_ADDED,
})
}
func (o *deviceResourcesObservation) HandleResourceUnpublished(ctx context.Context, val *pb.Event_ResourceUnpublished) error {
return o.h.Handle(ctx, DeviceResourcesObservationEvent{
Links: val.GetLinks(),
Event: DeviceResourcesObservationEvent_REMOVED,
})
}
func (o *deviceResourcesObservation) OnClose() {
o.removeSubscription()
o.h.OnClose()
}
func (o *deviceResourcesObservation) Error(err error) {
o.removeSubscription()
o.h.Error(err)
}
func (c *Client) ObserveDeviceResources(ctx context.Context, deviceID string, handler DeviceResourcesObservationHandler) (string, error) {
ID, err := uuid.NewV4()
if err != nil {
return "", err
}
sub, err := c.NewDeviceSubscription(ctx, deviceID, &deviceResourcesObservation{
h: handler,
removeSubscription: func() {
c.stopObservingDeviceResources(ID.String())
},
})
if err != nil {
return "", err
}
c.insertSubscription(ID.String(), sub)
return ID.String(), err
}
func (c *Client) stopObservingDeviceResources(observationID string) (wait func(), err error) {
s, err := c.popSubscription(observationID)
if err != nil {
return nil, err
}
return s.Cancel()
}
func (c *Client) StopObservingDeviceResources(ctx context.Context, observationID string) error {
wait, err := c.stopObservingDeviceResources(observationID)
if err != nil {
return err
}
wait()
return nil
}