Add util package

internal/util/compress.go

@@ -0,0 +1,73 @@
+package util
+
+import (
+	"compress/gzip"
+	"io"
+	"os"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
+)
+
+func CompressFile(fileIn string, fileOut string) error {
+	originalFile, err := os.Open(fileIn)
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	defer originalFile.Close()
+
+	gzippedFile, err := os.Create(fileOut)
+
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	defer gzippedFile.Close()
+
+	gzipWriter := gzip.NewWriter(gzippedFile)
+	defer gzipWriter.Close()
+
+	_, err = io.Copy(gzipWriter, originalFile)
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	gzipWriter.Flush()
+	if err := os.Remove(fileIn); err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+
+	return nil
+}
+
+func UncompressFile(fileIn string, fileOut string) error {
+	gzippedFile, err := os.Open(fileIn)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	defer gzippedFile.Close()
+
+	gzipReader, _ := gzip.NewReader(gzippedFile)
+	defer gzipReader.Close()
+
+	uncompressedFile, err := os.Create(fileOut)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	defer uncompressedFile.Close()
+
+	_, err = io.Copy(uncompressedFile, gzipReader)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	if err := os.Remove(fileIn); err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+
+	return nil
+}