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deviceSubscription.go
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deviceSubscription.go
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package client
import (
"context"
"github.com/plgd-dev/hub/v2/grpc-gateway/pb"
)
// DeviceSubscription subscription.
type DeviceSubscription struct {
id string
sub *DeviceSubscriptions
}
// NewDeviceSubscription creates new devices subscriptions to listen events: resource published, resource unpublished.
// JWT token must be stored in context for grpc call.
func (c *Client) NewDeviceSubscription(ctx context.Context, deviceID string, handle SubscriptionHandler) (*DeviceSubscription, error) {
return NewDeviceSubscription(ctx, deviceID, handle, handle, c.gateway)
}
// NewDeviceSubscription creates new devices subscriptions to listen events: resource published, resource unpublished.
// JWT token must be stored in context for grpc call.
func NewDeviceSubscription(ctx context.Context, deviceID string, closeErrorHandler SubscriptionHandler, handle interface{}, gwClient pb.GrpcGatewayClient) (*DeviceSubscription, error) {
sub, err := NewDeviceSubscriptions(ctx, gwClient, closeErrorHandler.Error)
if err != nil {
return nil, err
}
s, err := sub.Subscribe(ctx, deviceID, closeErrorHandler, handle)
if err != nil {
wait, err1 := sub.Cancel()
if err1 == nil {
wait()
}
return nil, err
}
return &DeviceSubscription{
id: s.ID(),
sub: sub,
}, nil
}
// Cancel cancels subscription.
func (s *DeviceSubscription) Cancel() (wait func(), err error) {
return s.sub.Cancel()
}
// ID returns subscription id.
func (s *DeviceSubscription) ID() string {
return s.id
}