PKGBUILD/pkg/daemon/daemon.go

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)

	errorChannel := make(chan error, 0)
	//humidityChannel := make(chan *types.Humidity, 0)
	temperatureChannel := make(chan *types.Temperature, 0)

	// go sensor.ReadHumiditiesContinuously(cnf.GetHumiditySensors(config.ENABLED), humidityChannel, errorChannel)
	go sensor.ReadTemperaturesContinuously(cnf.GetTemperatureSensors(config.ENABLED), temperatureChannel, errorChannel)

	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)
		}
	}
}