logging is now compatible with klog.

See https://git.kyleisom.net/lib/libklogger

logging/file.go

@@ -0,0 +1,73 @@
+package logging
+
+import "os"
+
+// File writes its logs to file.
+type File struct {
+	fo, fe *os.File
+	*LogWriter
+}
+
+func (fl *File) Close() {
+	fl.fo.Close()
+	if fl.fe != nil {
+		fl.fe.Close()
+	}
+}
+
+// NewFile creates a new Logger that writes all logs to the file
+// specified by path. If overwrite is specified, the log file will be
+// truncated before writing. Otherwise, the log file will be appended
+// to.
+func NewFile(path string, overwrite bool) (*File, error) {
+	fl := new(File)
+
+	var err error
+
+	if overwrite {
+		fl.fo, err = os.Create(path)
+	} else {
+		fl.fo, err = os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0644)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	fl.LogWriter = NewLogWriter(fl.fo, fl.fo)
+	return fl, nil
+}
+
+// NewSplitFile creates a new Logger that writes debug and information
+// messages to the output file, and warning and higher messages to the
+// error file. If overwrite is specified, the log files will be
+// truncated before writing.
+func NewSplitFile(outpath, errpath string, overwrite bool) (*File, error) {
+	fl := new(File)
+
+	var err error
+
+	if overwrite {
+		fl.fo, err = os.Create(outpath)
+	} else {
+		fl.fo, err = os.OpenFile(outpath, os.O_WRONLY|os.O_APPEND, 0644)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	if overwrite {
+		fl.fe, err = os.Create(errpath)
+	} else {
+		fl.fe, err = os.OpenFile(errpath, os.O_WRONLY|os.O_APPEND, 0644)
+	}
+
+	if err != nil {
+		fl.Close()
+		return nil, err
+	}
+
+	fl.LogWriter = NewLogWriter(fl.fo, fl.fe)
+	return fl, nil
+}