PKGBUILD/pkg/logger/file_logger.go

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2019-03-04 09:45:00 +00:00
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,
}
}