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observer.go
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observer.go
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package lib
import (
"fmt"
"io/ioutil"
"log"
"github.com/GrupaPracuj/iislog-prometheus-exporter/logging"
"github.com/fsnotify/fsnotify"
)
//Observe directory dir. If there is new file send its name by chanel
func newFileCheck(dir string, logger *log.Logger) (newFileAlert <-chan string, err error) {
logging.Info(logger, fmt.Sprintf("Observing %s directory", dir))
watcher, err := fsnotify.NewWatcher()
if err != nil {
logging.Error(logger, "Directory watcher fail", err)
return
}
err = watcher.Add(dir)
if err != nil {
logging.Error(logger, fmt.Sprintf("Watch directory %s fail", dir), err)
return
}
newFileAlertSender := make(chan string)
newFileAlert = newFileAlertSender
go func() {
for {
select {
case ev := <-watcher.Events:
if ev.Op == fsnotify.Create {
logging.Info(logger, fmt.Sprintf("New file: %s", ev.Name))
newFileAlertSender <- ev.Name
}
case err := <-watcher.Errors:
logging.Error(logger, "Watcher Error:", err)
}
}
}()
return
}
func findNewestFile(dir string, logger *log.Logger) (filename string) {
files, err := ioutil.ReadDir(dir)
if err != nil {
logging.Error(logger, fmt.Sprintf("Error with reading filenames in directory %s", dir), err)
return ""
}
if len(files) > 0 {
newestFile := files[0]
for _, file := range files {
if file.ModTime().After(newestFile.ModTime()) {
newestFile = file
}
}
return newestFile.Name()
}
return ""
}