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notifier.go
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notifier.go
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// Copyright 2020 SEQSENSE, Inc.
//
// 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 server
import (
"context"
"encoding/json"
"fmt"
"github.com/at-wat/mqtt-go"
"github.com/seqsense/aws-iot-device-sdk-go/v4/internal/ioterr"
"github.com/seqsense/aws-iot-device-sdk-go/v4/tunnel"
)
const (
defaultTopicFormat = "aws/things/%s/tunnels/notify"
)
// Notifier is a token notifier.
type Notifier struct {
cli mqtt.Client
topicFormat string
}
// NewNotifier creates token notifier via MQTT.
func NewNotifier(cli mqtt.Client, opts ...NotifierOption) *Notifier {
n := &Notifier{
cli: cli,
topicFormat: defaultTopicFormat,
}
for _, o := range opts {
o(n)
}
return n
}
func (n *Notifier) notify(ctx context.Context, thingName string, notify *tunnel.Notification) error {
b, err := json.Marshal(notify)
if err != nil {
return ioterr.New(err, "marshaling notification")
}
return n.cli.Publish(ctx,
&mqtt.Message{
Topic: fmt.Sprintf(n.topicFormat, thingName),
QoS: mqtt.QoS1,
Payload: b,
},
)
}
// NotifierOption is a functional option of Notifier.
type NotifierOption func(*Notifier)
// WithNotifyTopicFormat sets notify topic format.
// %s will be replaced by thing name.
func WithNotifyTopicFormat(format string) NotifierOption {
return func(n *Notifier) {
n.topicFormat = format
}
}