feat: file logger

cmd/cmd.go

@@ -8,6 +8,7 @@ import (
 	"git.cryptic.systems/fh-trier/go-flucky/cmd/remote"
 	"git.cryptic.systems/fh-trier/go-flucky/cmd/sensor"
 	"git.cryptic.systems/fh-trier/go-flucky/cmd/temperature"
+	"git.cryptic.systems/fh-trier/go-flucky/pkg/logger"
 	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
 
 	"git.cryptic.systems/fh-trier/go-flucky/pkg/config"
@@ -29,12 +30,19 @@ var rootCmd = &cobra.Command{
 				return fmt.Errorf("Can not locate the hostname: %v", err)
 			}
 
+			logfiles := make(map[logger.LogValue][]string)
+			logfiles[logger.LogHumidity] = []string{"/var/log/flucky/humidity.log"}
+			logfiles[logger.LogTemperature] = []string{"/var/log/flucky/temperature.log"}
+
 			fc := config.FluckyConfig{
 				Device: &types.Device{
 					DeviceID:     uuid.NewV4().String(),
 					DeviceName:   hostname,
 					CreationDate: time.Now(),
 				},
+				FileLogger: &logger.FileLogger{
+					LogFiles: logfiles,
+				},
 			}
 
 			err = config.Write(&fc, cfg)

pkg/config/fluckyconfig.go

@@ -8,6 +8,8 @@ import (
 	"text/tabwriter"
 	"time"
 
+	"git.cryptic.systems/fh-trier/go-flucky/pkg/logger"
+
 	"git.cryptic.systems/fh-trier/go-flucky/pkg/sensor"
 
 	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
@@ -16,9 +18,10 @@ import (
 
 // FluckyConfig dasd
 type FluckyConfig struct {
-	Device  *types.Device   `json:"device"`
-	Sensors []*types.Sensor `json:"sensors"`
+	Device *types.Device `json:"device"`
+	*logger.FileLogger
 	Remotes []*Remote       `json:"remotes"`
+	Sensors []*types.Sensor `json:"sensors"`
 }
 
 // AddSensor add a new sensor

pkg/logger/file_logger.go

@@ -0,0 +1,161 @@
+package logger
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"git.cryptic.systems/fh-trier/go-flucky/pkg/internal/errutils"
+
+	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
+)
+
+type FileLogger struct {
+	LogFiles map[LogValue][]string `json:"logfiles"`
+	writer   io.Writer
+}
+
+func (fl *FileLogger) AddLogFile(logfile string, logValue LogValue) {
+	fl.LogFiles[logValue] = append(fl.LogFiles[logValue], logfile)
+}
+
+func (fl *FileLogger) LogHumidities(humidities []*types.Humidity) error {
+	countLogfiles := len(fl.LogFiles[LogHumidity])
+	wg := sync.WaitGroup{}
+	wg.Add(countLogfiles)
+
+	errChan := make(chan error)
+
+	for _, logfile := range fl.LogFiles[LogHumidity] {
+		go func(humidities []*types.Humidity, logfile string) {
+			defer wg.Done()
+
+			// read existing humidities as bytes
+			bytes, err := ioutil.ReadFile(logfile)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			// convert bytes into humidities
+			logHumidities := []*types.Humidity{}
+			err = json.Unmarshal(bytes, &logHumidities)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			// append new humidities with exsisting humidities from logfile
+			logHumidities = append(logHumidities, humidities...)
+
+			// convert humidities into json file
+			bytes, err = json.MarshalIndent(logHumidities, "", " ")
+			err = json.Unmarshal(bytes, &logHumidities)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			ioutil.WriteFile(logfile, bytes, os.ModePerm)
+
+		}(humidities, logfile)
+	}
+
+	wg.Wait()
+
+	errList := errutils.CollectErrors(errChan)
+	err := errutils.FormatErrors(errList)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (fl *FileLogger) LogTemperatures(temperatures []*types.Temperature) error {
+	countLogfiles := len(fl.LogFiles[LogTemperature])
+	wg := sync.WaitGroup{}
+	wg.Add(countLogfiles)
+
+	errChan := make(chan error)
+
+	for _, logfile := range fl.LogFiles[LogTemperature] {
+		go func(temps []*types.Temperature, lf string) {
+			defer wg.Done()
+
+			if _, err := os.Stat(lf); os.IsNotExist(err) {
+				err := os.MkdirAll(filepath.Dir(lf), os.ModeDir)
+				if err != nil {
+					errChan <- fmt.Errorf("Can not create directory: %v", err)
+					return
+				}
+				f, err := os.Create(lf)
+				if err != nil {
+					errChan <- fmt.Errorf("Can not create log file: %v", err)
+					return
+				}
+				f.Close()
+			}
+
+			// open logfile
+			f, err := os.Open(lf)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			// decode file content into temperatures
+			logTemperatures := []*types.Temperature{}
+			decoder := json.NewDecoder(f)
+			err = decoder.Decode(&logTemperatures)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			// close file
+			f.Close()
+
+			// append new humidities with exsisting humidities from logfile
+			logTemperatures = append(logTemperatures, temps...)
+
+			// create new logfile
+			f, err = os.Create(lf)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			// convert humidities into json file
+			encoder := json.NewEncoder(f)
+			encoder.SetIndent("", " ")
+			err = encoder.Encode(logTemperatures)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			f.Close()
+
+		}(temperatures, logfile)
+	}
+
+	wg.Wait()
+
+	errList := errutils.CollectErrors(errChan)
+	err := errutils.FormatErrors(errList)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func NewFileLogger(w io.Writer) *FileLogger {
+	return &FileLogger{
+		writer: w,
+	}
+}

pkg/logger/logger.go

@@ -0,0 +1,24 @@
+package logger
+
+import (
+	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
+)
+
+type Logger interface {
+	LogHumidities(humidities []*types.Humidity) error
+	LogTemperatures(temperatures []*types.Temperature) error
+}
+
+type LoggerType string
+
+const (
+	LogFile   LoggerType = "file"
+	LogRemote            = "remote"
+)
+
+type LogValue string
+
+const (
+	LogHumidity    LogValue = "humidity"
+	LogTemperature          = "temperature"
+)