Added compression

Compression.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/flate"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"scabiosa/Logging"
+)
+
+func CreateBakFile(filename string, folderPath string, destinationPath string) string {
+	logger := Logging.DetailedLogger("Compression", "CreateBakFile")
+
+	var buf bytes.Buffer
+	compress(folderPath, &buf)
+
+	fileName := filename + ".bak"
+
+	fileToWrite, err := os.OpenFile(destinationPath + string(os.PathSeparator) + fileName, os.O_CREATE|os.O_RDWR, os.FileMode(600))
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	if _, err := io.Copy(fileToWrite, &buf); err != nil {
+		logger.Fatal(err)
+	}
+
+	return fileName
+}
+
+
+func compress(folderPath string, buf io.Writer){
+	logger := Logging.DetailedLogger("Gzip", "compress")
+
+	zr, _ := gzip.NewWriterLevel(buf, flate.BestCompression)
+	tw := tar.NewWriter(zr)
+
+	fmt.Printf("[%s] Start compression...\n", filepath.Base(folderPath))
+
+	filepath.Walk(folderPath, func(file string, fi os.FileInfo, err error) error {
+		header, err := tar.FileInfoHeader(fi, file)
+		if err != nil {
+			logger.Fatal(err)
+		}
+
+		relPath, _ := filepath.Rel(filepath.Dir(folderPath), file)
+
+		header.Name = relPath
+		if err := tw.WriteHeader(header); err != nil {
+			logger.Fatal(err)
+		}
+
+		if !fi.IsDir(){
+			data, err := os.Open(file)
+			if err != nil {
+				logger.Fatal(err)
+			}
+
+			fmt.Printf("[%s] Compressing: %s (%d bytes)\n", filepath.Base(folderPath) ,relPath, fi.Size())
+			if _, err := io.Copy(tw, data); err != nil {
+				logger.Fatal(err)
+			}
+		}
+		return nil
+	})
+
+	if err := tw.Close(); err != nil {
+		logger.Fatal(err)
+	}
+
+	if err := zr.Close(); err != nil {
+		logger.Fatal(err)
+	}
+
+
+	fmt.Printf("[%s] Compression Done.\n", filepath.Base(folderPath))
+}