add more logging

main.go

@@ -16,6 +16,8 @@ var weatherSource weathersource.WeatherSource
 var weatherAPI api.WeatherAPI
 
 func main() {
+	log.SetOutput(os.Stdout)
+
 	//setup new sensorRegistry -> MongodbSensorRegistry
 	var err error
 	if sensorRegistry, err = storage.NewMongodbSensorRegistry(config.MongoConfiguration); err != nil {
@@ -44,6 +46,7 @@ func main() {
 	defer weatherAPI.Close()
 	weatherAPI.AddNewWeatherDataCallback(handleNewWeatherData)
 
+	log.Print("Application is running")
 	err = weatherAPI.Start()
 	if err != nil {
 		log.Fatal(err)
@@ -54,6 +57,7 @@ func main() {
 func handleNewWeatherData(wd storage.WeatherData) error {
 	_, err := sensorRegistry.ResolveSensorById(wd.SensorId)
 	if !config.AllowUnregisteredSensors && err != nil {
+		log.Print("discarded invalid weatherdata")
 		return fmt.Errorf("could not resolve sensor")
 	}
 	weatherStorage.Save(wd)

storage/influxdb-storage.go

@@ -3,6 +3,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"log"
 	"time"
 	"weather-data/config"
 
@@ -23,6 +24,7 @@ func NewInfluxStorage(cfg config.InfluxConfig) (*influxStorage, error) {
 	influx.config = cfg
 	influx.client = influxdb2.NewClient(cfg.Host, cfg.Token)
 	influx.measurement = "data"
+	log.Print("Successfully created influx-client")
 	return influx, nil
 }
 
@@ -44,6 +46,7 @@ func (storage *influxStorage) Save(data WeatherData) error {
 
 	writeAPI := storage.client.WriteAPI(storage.config.Organization, storage.config.Bucket)
 	writeAPI.WritePoint(datapoint)
+	log.Print("Written weather data point to influx-db")
 	return nil
 }
 

storage/mongodb-storage.go

@@ -48,6 +48,8 @@ func NewMongodbSensorRegistry(mongoCfg config.MongoConfig) (*mongodbSensorRegist
 	weathersensorsDB := client.Database(mongoCfg.Database)
 	sensorRegistry.sensorCollection = weathersensorsDB.Collection(mongoCfg.Collection)
 
+	log.Print("successfully created mongodb connection")
+
 	return sensorRegistry, nil
 }
 

weathersource/mqtt-source.go

@@ -58,6 +58,7 @@ func NewMqttSource(cfg config.MqttConfig) (*mqttWeatherSource, error) {
 
 	go source.publishDataValues()
 
+	log.Print("successfully connected to mqtt-broker")
 	return source, nil
 }