/
observeDeviceResources.go
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/
observeDeviceResources.go
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// ************************************************************************
// Copyright (C) 2022 plgd.dev, s.r.o.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ************************************************************************
package client
import (
"context"
"github.com/plgd-dev/device/v2/pkg/net/coap"
"github.com/plgd-dev/device/v2/schema"
"github.com/plgd-dev/device/v2/schema/resources"
)
type DeviceResourcesObservationHandler = interface {
Handle(ctx context.Context, links schema.ResourceLinks)
OnClose()
Error(err error)
}
type deviceResourcesObserver struct {
c *Client
handler DeviceResourcesObservationHandler
}
func newDeviceResourcesObserver(ctx context.Context, c *Client, deviceID string, handler DeviceResourcesObservationHandler) (string, error) {
observationID, err := c.ObserveResource(ctx, deviceID, resources.ResourceURI, &deviceResourcesObserver{
c: c,
handler: handler,
})
if err != nil {
return "", err
}
return observationID, nil
}
func (o *deviceResourcesObserver) Error(err error) {
o.handler.Error(err)
}
func (o *deviceResourcesObserver) OnClose() {
o.handler.OnClose()
}
func (o *deviceResourcesObserver) Handle(ctx context.Context, body coap.DecodeFunc) {
var links schema.ResourceLinks
err := body(&links)
if err != nil {
o.handler.Error(err)
return
}
o.handler.Handle(ctx, links)
}
// ObserveDeviceResources starts observing links in the device.
// In the absence of a cached device, it is found through multicast and stored with an expiration time.
func (c *Client) ObserveDeviceResources(ctx context.Context, deviceID string, handler DeviceResourcesObservationHandler) (string, error) {
observationID, err := newDeviceResourcesObserver(ctx, c, deviceID, handler)
if err != nil {
return "", err
}
return observationID, nil
}
// StopObservingDeviceResources stops observing links in the device.
// In the absence of a cached device, it is found through multicast and stored with an expiration time.
func (c *Client) StopObservingDeviceResources(ctx context.Context, observationID string) (bool, error) {
return c.StopObservingResource(ctx, observationID)
}