feat(daemon): add new subcommand to start a daemon

pkg/daemon/daemon.go

@@ -1,26 +1,63 @@
 package daemon
 
 import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
 	"github.com/volker-raschek/flucky/pkg/config"
+	"github.com/volker-raschek/flucky/pkg/logfile"
+	"github.com/volker-raschek/flucky/pkg/sensor"
+	"github.com/volker-raschek/flucky/pkg/types"
 )
 
 // Start the daemon
 func Start(cnf *config.Configuration) error {
 
-	// interrupt := make(chan os.Signal, 1)
-	// signal.Notify(interrupt, os.Interrupt, os.Kill, syscall.SIGTERM)
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, os.Interrupt, os.Kill, syscall.SIGTERM)
 
-	// humidityChannel := make(chan *types.Humidity)
-	// temperatureChannel := make(chan *types.Temperature)
+	errorChannel := make(chan error, 0)
+	//humidityChannel := make(chan *types.Humidity, 0)
+	temperatureChannel := make(chan *types.Temperature, 0)
 
-	// go sensor.ReadHumiditiesContinuously(humiditySensors, humidityChannel)
-	// go sensor.ReadTemperaturesContinuously(temperatureSensors, temperatureChannel)
+	// go sensor.ReadHumiditiesContinuously(cnf.GetHumiditySensors(config.ENABLED), humidityChannel, errorChannel)
+	go sensor.ReadTemperaturesContinuously(cnf.GetTemperatureSensors(config.ENABLED), temperatureChannel, errorChannel)
 
-	// for {
-	// 	select {
-	// 	case killSignal := <-interrupt:
-	// 		return fmt.Errorf("Daemon was interruped by system signal %v", killSignal)
-	// 	}
-	// }
-	return nil
+	temperatures := make([]*types.Temperature, 0)
+
+	ticker := time.Tick(time.Second * 60)
+
+	for {
+		select {
+		case <-ticker:
+			log.Printf("Write measured values into logfile")
+
+			log.Printf("%v new measured temperature values", len(temperatures))
+			err := logfile.WriteTemperatures(temperatures, cnf.Device.TemperatureLogfile, true)
+			if err != nil {
+				return fmt.Errorf("Can not save temperatures: %v", err)
+			}
+			temperatures = make([]*types.Temperature, 0)
+
+		case temperature, more := <-temperatureChannel:
+			if more {
+				temperatures = append(temperatures, temperature)
+			} else {
+				log.Printf("Temperature Channel closed. Write remaining values into the logfile")
+				err := logfile.WriteTemperatures(temperatures, cnf.Device.TemperatureLogfile, true)
+				if err != nil {
+					return fmt.Errorf("Can not save temperatures: %v", err)
+				}
+			}
+
+		case killSignal := <-interrupt:
+			//close(humidityChannel)
+			close(temperatureChannel)
+			return fmt.Errorf("Daemon was interruped by system signal %v", killSignal)
+		}
+	}
 }

pkg/logfile/logfile.go

@@ -74,6 +74,20 @@ func ReadTemperatures(temperatureLogfile string) ([]*types.Temperature, error) {
 	return temperatures, nil
 }
 
+func ReadTemperaturesChannel(temperatureChannel <-chan *types.Temperature) []*types.Temperature {
+	temperatures := make([]*types.Temperature, 0)
+	for {
+		select {
+		case temperature, more := <-temperatureChannel:
+			if more {
+				temperatures = append(temperatures, temperature)
+			}
+		default:
+			return temperatures
+		}
+	}
+}
+
 // ReadTemperaturesCustom from a custom reader and returns an array with
 // temperatures
 func ReadTemperaturesCustom(r io.Reader) ([]*types.Temperature, error) {
@@ -172,7 +186,7 @@ func WriteTemperaturesCustom(temperatures []*types.Temperature, w io.Writer, com
 	writeCreationDate(temperatures)
 
 	jsonEncoder := json.NewEncoder(w)
-	jsonEncoder.SetIndent("", " ")
+	jsonEncoder.SetIndent("", "  ")
 	err := jsonEncoder.Encode(temperatures)
 	if err != nil {
 		return fmt.Errorf("Can not encode temperatures: %v", err)