PKGBUILD/pkg/logfile/json.go

package logfile

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"strconv"
	"time"

	"github.com/go-flucky/flucky/pkg/types"
)

type jsonLogfile struct {
	logfile string
}

func (jl *jsonLogfile) Read() ([]types.MeasuredValue, error) {

	if _, err := os.Stat(jl.logfile); os.IsNotExist(err) {
		return nil, fmt.Errorf("%v: %v", errorLogfileNotFound, jl.logfile)
	}

	unmarshaledMeasuredValues := make([]interface{}, 0)

	bytes, err := ioutil.ReadFile(jl.logfile)
	if err != nil {
		return nil, fmt.Errorf("%v %v: %v", errorLogfileRead, jl.logfile, err)
	}

	err = json.Unmarshal(bytes, &unmarshaledMeasuredValues)
	if err != nil {
		return nil, fmt.Errorf("%v %v: %v", errorLogfileUnmarshal, jl.logfile, err)
	}

	measuredValues := make([]types.MeasuredValue, 0)

	for _, unmarshaledMeasuredValue := range unmarshaledMeasuredValues {

		if unmarshaledMeasuredValue == nil {
			continue
		}

		mappedMeasuredValue, ok := unmarshaledMeasuredValue.(map[string]interface{})
		if !ok {
			log.Println("Can not parse into map")
			continue
		}

		if _, ok := mappedMeasuredValue["temperature_id"]; ok {
			temperature, err := jl.transformTemperature(mappedMeasuredValue)
			if err != nil {
				log.Printf("Can not unmarshal temperature from map: %v", err)
				continue
			}
			measuredValues = append(measuredValues, temperature)
		}

		if _, ok := mappedMeasuredValue["humidity_id"]; ok {
			humidity, err := jl.transformHumidity(mappedMeasuredValue)
			if err != nil {
				log.Printf("Can not unmarshal humidity from map: %v", err)
				continue
			}
			measuredValues = append(measuredValues, humidity)
		}

	}

	return measuredValues, nil
}

func (jl *jsonLogfile) transformHumidity(mappedMeasuredValue map[string]interface{}) (types.MeasuredValue, error) {

	humidity := &types.Humidity{
		HumidityID:   mappedMeasuredValue["humidity_id"].(string),
		SensorID:     mappedMeasuredValue["sensor_id"].(string),
		CreationDate: nil,
		UpdateDate:   nil,
	}

	humidityValue, err := strconv.ParseFloat(mappedMeasuredValue["humidity_value"].(string), 64)
	if err != nil {
		return nil, fmt.Errorf("%v for humidity value. HumidityID %v: %v", errorParseFloat, mappedMeasuredValue["humidity_id"].(string), err)
	}
	humidity.HumidityValue = humidityValue

	humidityFromDate, err := time.Parse(timeFormat, mappedMeasuredValue["humidity_from_date"].(string))
	if err != nil {
		return nil, fmt.Errorf("%v for humidity from date. HumidityID %v: %v", errorParseTime, mappedMeasuredValue["humidity_id"].(string), err)
	}
	humidity.HumidityFromDate = humidityFromDate

	humidityTillDate, err := time.Parse(timeFormat, mappedMeasuredValue["humidity_till_date"].(string))
	if err != nil {
		return nil, fmt.Errorf("%v for humidity till date. HumidityID %v: %v", errorParseTime, mappedMeasuredValue["humidity_id"].(string), err)
	}
	humidity.HumidityTillDate = humidityTillDate

	if mappedMeasuredValue["creation_date"] != nil {
		creationDate, err := time.Parse(timeFormat, mappedMeasuredValue["creation_date"].(string))
		if err != nil {
			return nil, fmt.Errorf("%v for creation date. HumidityID %v: %v", errorParseTime, mappedMeasuredValue["humidity_id"].(string), err)
		}
		humidity.CreationDate = &creationDate
	}

	if mappedMeasuredValue["update_date"] != nil {
		updateDate, err := time.Parse(timeFormat, mappedMeasuredValue["update_date"].(string))
		if err != nil {
			return nil, fmt.Errorf("%v for update date. HumidityID %v: %v", errorParseTime, mappedMeasuredValue["humidity_id"].(string), err)
		}
		humidity.UpdateDate = &updateDate
	}

	return humidity, nil
}

func (jl *jsonLogfile) transformTemperature(mappedMeasuredValue map[string]interface{}) (types.MeasuredValue, error) {

	temperature := &types.Temperature{
		TemperatureID: mappedMeasuredValue["temperature_id"].(string),
		SensorID:      mappedMeasuredValue["sensor_id"].(string),
		CreationDate:  nil,
		UpdateDate:    nil,
	}

	temperatureValue, err := strconv.ParseFloat(mappedMeasuredValue["temperature_value"].(string), 64)
	if err != nil {
		return nil, fmt.Errorf("%v for temperature value. TemperatureID %v: %v", errorParseFloat, mappedMeasuredValue["temperature_id"].(string), err)
	}
	temperature.TemperatureValue = temperatureValue

	temperatureFromDate, err := time.Parse(timeFormat, mappedMeasuredValue["temperature_from_date"].(string))
	if err != nil {
		return nil, fmt.Errorf("%v for temperature from date. TemperatureID %v: %v", errorParseTime, mappedMeasuredValue["temperature_id"].(string), err)
	}
	temperature.TemperatureFromDate = temperatureFromDate

	temperatureTillDate, err := time.Parse(timeFormat, mappedMeasuredValue["temperature_till_date"].(string))
	if err != nil {
		return nil, fmt.Errorf("%v for temperature till date. TemperatureID %v: %v", errorParseTime, mappedMeasuredValue["temperature_id"].(string), err)
	}
	temperature.TemperatureTillDate = temperatureTillDate

	if mappedMeasuredValue["creation_date"] != nil {
		creationDate, err := time.Parse(timeFormat, mappedMeasuredValue["creation_date"].(string))
		if err != nil {
			return nil, fmt.Errorf("%v for creation date. TemperatureID %v: %v", errorParseTime, mappedMeasuredValue["temperature_id"].(string), err)
		}
		temperature.CreationDate = &creationDate
	}

	if mappedMeasuredValue["update_date"] != nil {
		updateDate, err := time.Parse(timeFormat, mappedMeasuredValue["update_date"].(string))
		if err != nil {
			return nil, fmt.Errorf("%v for update date. TemperatureID %v: %v", errorParseTime, mappedMeasuredValue["temperature_id"].(string), err)
		}
		temperature.UpdateDate = &updateDate
	}

	return temperature, nil
}

func (jl *jsonLogfile) Write(measuredValues []types.MeasuredValue) error {

	if _, err := os.Stat(filepath.Dir(jl.logfile)); os.IsNotExist(err) {
		if err := os.MkdirAll(filepath.Dir(jl.logfile), 755); err != nil {
			return fmt.Errorf("Directory for the logfile can not be created: %v", err)
		}
	}

	writeCreationDate(measuredValues)

	f, err := os.Create(jl.logfile)
	if err != nil {
		return fmt.Errorf("%v %v: %v", errorLogfileCreate, jl.logfile, err)
	}

	jsonEncoder := json.NewEncoder(f)
	jsonEncoder.SetIndent("", "  ")
	err = jsonEncoder.Encode(measuredValues)
	if err != nil {
		return fmt.Errorf("%v %v: %v", errorLogfileEncode, jl.logfile, err)
	}

	return nil

}