| 188 | } |
| 189 | |
| 190 | func writeMetrics(w io.Writer, mfs []*dto.MetricFamily, useTags bool, prefix string, now model.Time) error { |
| 191 | vec, err := expfmt.ExtractSamples(&expfmt.DecodeOptions{ |
| 192 | Timestamp: now, |
| 193 | }, mfs...) |
| 194 | if err != nil { |
| 195 | return err |
| 196 | } |
| 197 | |
| 198 | buf := bufio.NewWriter(w) |
| 199 | for _, s := range vec { |
| 200 | if prefix != "" { |
| 201 | for _, c := range prefix { |
| 202 | if _, err := buf.WriteRune(c); err != nil { |
| 203 | return err |
| 204 | } |
| 205 | } |
| 206 | if err := buf.WriteByte('.'); err != nil { |
| 207 | return err |
| 208 | } |
| 209 | } |
| 210 | if err := writeMetric(buf, s.Metric, useTags); err != nil { |
| 211 | return err |
| 212 | } |
| 213 | if _, err := fmt.Fprintf(buf, " %g %d\n", s.Value, int64(s.Timestamp)/millisecondsPerSecond); err != nil { |
| 214 | return err |
| 215 | } |
| 216 | if err := buf.Flush(); err != nil { |
| 217 | return err |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | return nil |
| 222 | } |
| 223 | |
| 224 | func writeMetric(buf *bufio.Writer, m model.Metric, useTags bool) error { |
| 225 | metricName, hasName := m[model.MetricNameLabel] |