// NewEncoder returns a new encoder based on content type negotiation. func NewEncoder(w io.Writer, format Format) Encoder { switch format { case FmtProtoDelim: return encoder(func(v *dto.MetricFamily) error { _, err := pbutil.WriteDelimited(w, v) return err }) case FmtProtoCompact: return encoder(func(v *dto.MetricFamily) error { _, err := fmt.Fprintln(w, v.String()) return err }) case FmtProtoText: return encoder(func(v *dto.MetricFamily) error { _, err := fmt.Fprintln(w, proto.MarshalTextString(v)) return err }) case FmtText: return encoder(func(v *dto.MetricFamily) error { _, err := MetricFamilyToText(w, v) return err }) } panic("expfmt.NewEncoder: unknown format") }
// WriteProtoDelimited writes the MetricFamily to the writer in delimited // protobuf format and returns the number of bytes written and any error // encountered. func WriteProtoDelimited(w io.Writer, p *dto.MetricFamily) (int, error) { return pbutil.WriteDelimited(w, p) }