chore: improve logx gzip (#3332)

core/logx/rotatelogger.go

@@ -4,7 +4,6 @@ import (
 	"compress/gzip"
 	"errors"
 	"fmt"
-	"io"
 	"log"
 	"os"
 	"path"
@@ -406,7 +405,7 @@ func (l *RotateLogger) write(v []byte) {
 func compressLogFile(file string) {
 	start := time.Now()
 	Infof("compressing log file: %s", file)
-	if err := gzipFile(file); err != nil {
+	if err := gzipFile(file, fileSys); err != nil {
 		Errorf("compress error: %s", err)
 	} else {
 		Infof("compressed log file: %s, took %s", file, time.Since(start))
@@ -421,26 +420,37 @@ func getNowDateInRFC3339Format() string {
 	return time.Now().Format(fileTimeFormat)
 }
 
-func gzipFile(file string) error {
-	in, err := os.Open(file)
+func gzipFile(file string, fsys fileSystem) (err error) {
+	in, err := fsys.Open(file)
 	if err != nil {
 		return err
 	}
+	defer func() {
+		if e := fsys.Close(in); e != nil {
+			Errorf("failed to close file: %s, error: %v", file, e)
+		}
+		if err == nil {
+			// only remove the original file when compression is successful
+			err = fsys.Remove(file)
+		}
+	}()
 
-	out, err := os.Create(fmt.Sprintf("%s%s", file, gzipExt))
+	out, err := fsys.Create(fmt.Sprintf("%s%s", file, gzipExt))
 	if err != nil {
 		return err
 	}
-	defer out.Close()
+	defer func() {
+		e := fsys.Close(out)
+		if err == nil {
+			err = e
+		}
+	}()
 
 	w := gzip.NewWriter(out)
-	if _, err = io.Copy(w, in); err != nil {
-		return err
-	} else if err = w.Close(); err != nil {
+	if _, err = fsys.Copy(w, in); err != nil {
+		// failed to copy, no need to close w
 		return err
 	}
 
-	in.Close()
-
-	return os.Remove(file)
+	return fsys.Close(w)
 }