/
service.go
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/
service.go
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/**
* Copyright 2017 Yannick Roffin
*
* 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 mqtt_service
import (
"encoding/json"
"fmt"
"sync"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
"github.com/spf13/viper"
"github.com/yroffin/jarvis-go-ext/logger"
)
// MqttService service descriptor
type MqttService struct {
handle mqtt.Client
}
var instance *MqttService
var once sync.Once
var mutex = &sync.Mutex{}
// Service singleton instance
func Service() *MqttService {
once.Do(func() {
instance = new(MqttService)
instance.init()
})
return instance
}
// Publish text
func (that *MqttService) Publish(topic string, payload string) *MqttService {
return that.PublishRaw(topic, payload, 0, false)
}
// Publish text
func (that *MqttService) PublishRaw(topic string, payload string, qos byte, retained bool) *MqttService {
var token = that.handle.Publish(topic, qos, retained, payload)
token.Wait()
return that
}
// PublishData
func (that *MqttService) PublishData(topic string, jsonData interface{}) *MqttService {
b, err := json.MarshalIndent(jsonData, "", " ")
if err != nil {
fmt.Println("error:", err)
}
that.Publish(topic, string(b))
return that
}
// internal handler
var f mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
logger.Default.Info("mqtt", logger.Fields{
"topic": msg.Topic(),
"payload": msg.Payload(),
})
}
// init initialize this module
func (that *MqttService) init() {
// mqtt client
opts := mqtt.NewClientOptions()
opts.AddBroker(viper.GetString("jarvis.mqtt.url"))
opts.SetClientID("gojarvis")
opts.SetKeepAlive(2 * time.Second)
opts.SetDefaultPublishHandler(f)
opts.SetPingTimeout(1 * time.Second)
that.handle = mqtt.NewClient(opts)
if token := that.handle.Connect(); token.Wait() && token.Error() != nil {
// log error and panic
logger.Default.Error("mqtt", logger.Fields{
"url": viper.GetString("jarvis.mqtt.url"),
"id": "gojarvis",
"token/error": token.Error(),
})
panic(token.Error())
} else {
// log information
logger.Default.Info("mqtt", logger.Fields{
"url": viper.GetString("jarvis.mqtt.url"),
"id": "gojarvis",
})
}
}