add recorder

recorder/file.go

@@ -0,0 +1,59 @@
+package recorder
+
+import (
+	"context"
+	"os"
+
+	"github.com/go-gost/core/recorder"
+)
+
+type fileRecorderOptions struct {
+	sep string
+}
+
+type FileRecorderOption func(opts *fileRecorderOptions)
+
+func SepRecorderOption(sep string) FileRecorderOption {
+	return func(opts *fileRecorderOptions) {
+		opts.sep = sep
+	}
+}
+
+type fileRecorder struct {
+	filename string
+	sep      string
+}
+
+// FileRecorder records data to file.
+func FileRecorder(filename string, opts ...FileRecorderOption) recorder.Recorder {
+	var options fileRecorderOptions
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &fileRecorder{
+		filename: filename,
+		sep:      options.sep,
+	}
+}
+
+func (r *fileRecorder) Record(ctx context.Context, b []byte) error {
+	f, err := os.OpenFile(r.filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err = f.Write(b); err != nil {
+		return err
+	}
+	if r.sep != "" {
+		_, err := f.WriteString(r.sep)
+		return err
+	}
+	return nil
+}
+
+func (r *fileRecorder) Close() error {
+	return nil
+}