PKGBUILD/cli/temperature/temperature.go

package temperature

import (
	"context"
	"fmt"
	"net/url"
	"os"

	"git.cryptic.systems/volker.raschek/flucky/pkg/cli"
	"git.cryptic.systems/volker.raschek/flucky/pkg/config"
	"git.cryptic.systems/volker.raschek/flucky/pkg/repository"
	"git.cryptic.systems/volker.raschek/flucky/pkg/sensor"
	"git.cryptic.systems/volker.raschek/flucky/pkg/types"
	"git.cryptic.systems/volker.raschek/go-logger"
	"github.com/spf13/cobra"
)

func InitCmd(cmd *cobra.Command) error {
	temperatureCmd := &cobra.Command{
		Use:   "temperature",
		Short: "Read and list temperature values",
	}

	readTemperatureCmd := &cobra.Command{
		Use:   "read",
		Short: "Read temperature values from sensors",
		RunE:  readTemperature,
	}
	readTemperatureCmd.Flags().Bool("persist", true, "Persist measured values to the repository")

	temperatureCmd.AddCommand(readTemperatureCmd)
	cmd.AddCommand(temperatureCmd)

	return nil
}

func readTemperature(cmd *cobra.Command, args []string) error {
	configFile, err := cmd.Flags().GetString("config")
	if err != nil {
		return fmt.Errorf("No config file defined")
	}

	persist, err := cmd.Flags().GetBool("persist")
	if err != nil {
		return fmt.Errorf("Flag persist not defined: %v", err)
	}

	cnf, err := config.Read(configFile)
	if err != nil {
		return err
	}

	dsnURL, err := url.Parse(cnf.DSN)
	if err != nil {
		return err
	}

	logLevelString, err := cmd.Flags().GetString("loglevel")
	if err != nil {
		return err
	}

	logLevel, err := logger.ParseLogLevel(logLevelString)
	if err != nil {
		return err
	}

	flogger := logger.NewLogger(logLevel)

	repo, err := repository.New(dsnURL, flogger)
	if err != nil {
		return err
	}

	ctx := context.Background()

	sensorTypes, err := repo.GetSensors(ctx)
	if err != nil {
		return err
	}

	sensorTypes, err = types.FilterSensorByMeasuredValueTypes(sensorTypes, types.Temperature)
	if err != nil {
		return err
	}

	sensors := make([]sensor.Sensor, 0)
	for i := range sensorTypes {
		s, err := sensor.New(sensorTypes[i])
		if err != nil {
			return err
		}
		sensors = append(sensors, s)
	}

	measuredValueChannel, errorChannel := sensor.ReadPipeline(context.TODO(), sensors...)

	go func() {
		for {
			select {
			case err, open := <-errorChannel:
				if !open {
					return
				}
				flogger.Error("%v", err)
			}
		}
	}()

	measuredValues := make([]*types.MeasuredValue, 0)
LOOP:
	for {
		select {
		case measuredValue, open := <-measuredValueChannel:
			if !open {
				break LOOP
			}
			measuredValues = append(measuredValues, measuredValue)
		}
	}

	err = cli.PrintMeasuredValues(measuredValues, os.Stdout)
	if err != nil {
		return err
	}

	if persist {
		err = repo.AddMeasuredValues(ctx, measuredValues...)
		if err != nil {
			return err
		}
	}

	return nil
}