Example #1
0
func (s *Schedule) ExprSVG(t miniprofiler.Timer, w io.Writer, width, height int, unit string, res []*expr.Result) error {
	ch, err := s.ExprGraph(t, unit, res)
	if err != nil {
		return err
	}
	g := svg.New(w)
	g.StartviewUnit(100, 100, "%", 0, 0, width, height)
	g.Rect(0, 0, width, height, "fill: #ffffff")
	sgr := svgg.AddTo(g, 0, 0, width, height, "", 12, white)
	ch.Plot(sgr)
	return nil
}
Example #2
0
// Graph takes an OpenTSDB request data structure and queries OpenTSDB. Use the
// json parameter to pass JSON. Use the b64 parameter to pass base64-encoded
// JSON.
func Graph(t miniprofiler.Timer, w http.ResponseWriter, r *http.Request) (interface{}, error) {
	j := []byte(r.FormValue("json"))
	if bs := r.FormValue("b64"); bs != "" {
		b, err := base64.StdEncoding.DecodeString(bs)
		if err != nil {
			return nil, err
		}
		j = b
	}
	if len(j) == 0 {
		return nil, fmt.Errorf("either json or b64 required")
	}
	oreq, err := opentsdb.RequestFromJSON(j)
	if err != nil {
		return nil, err
	}
	if ads_v := r.FormValue("autods"); ads_v != "" {
		ads_i, err := strconv.Atoi(ads_v)
		if err != nil {
			return nil, err
		}
		if err := oreq.AutoDownsample(ads_i); err != nil {
			return nil, err
		}
	}
	ar := make(map[int]bool)
	for _, v := range r.Form["autorate"] {
		if i, err := strconv.Atoi(v); err == nil {
			ar[i] = true
		}
	}
	queries := make([]string, len(oreq.Queries))
	var start, end string
	if s, ok := oreq.Start.(string); ok && strings.Contains(s, "-ago") {
		start = strings.TrimSuffix(s, "-ago")
	}
	if s, ok := oreq.End.(string); ok && strings.Contains(s, "-ago") {
		end = strings.TrimSuffix(s, "-ago")
	}
	if start == "" && end == "" {
		s, sok := oreq.Start.(int64)
		e, eok := oreq.End.(int64)
		if sok && eok {
			start = fmt.Sprintf("%vs", e-s)
		}
	}
	m_units := make(map[string]string)
	for i, q := range oreq.Queries {
		if ar[i] {

			meta, err := schedule.MetadataMetrics(q.Metric)
			if err != nil {
				return nil, err
			}
			if meta == nil {
				return nil, fmt.Errorf("no metadata for %s: cannot use auto rate", q)
			}
			if meta.Unit != "" {
				m_units[q.Metric] = meta.Unit
			}
			if meta.Rate != "" {
				switch meta.Rate {
				case metadata.Gauge:
					// ignore
				case metadata.Rate:
					q.Rate = true
				case metadata.Counter:
					q.Rate = true
					q.RateOptions = opentsdb.RateOptions{
						Counter:    true,
						ResetValue: 1,
					}
				default:
					return nil, fmt.Errorf("unknown metadata rate: %s", meta.Rate)
				}
			}
		}
		queries[i] = fmt.Sprintf(`q("%v", "%v", "%v")`, q, start, end)
		if !schedule.Conf.TSDBContext().Version().FilterSupport() {
			if err := schedule.Search.Expand(q); err != nil {
				return nil, err
			}
		}
	}
	var tr opentsdb.ResponseSet
	b, _ := json.MarshalIndent(oreq, "", "  ")
	t.StepCustomTiming("tsdb", "query", string(b), func() {
		h := schedule.Conf.TSDBHost
		if h == "" {
			err = fmt.Errorf("tsdbHost not set")
			return
		}
		tr, err = oreq.Query(h)
	})
	if err != nil {
		return nil, err
	}
	cs, err := makeChart(tr, m_units)
	if err != nil {
		return nil, err
	}
	if _, present := r.Form["png"]; present {
		c := chart.ScatterChart{
			Title: fmt.Sprintf("%v - %v", oreq.Start, queries),
		}
		c.XRange.Time = true
		if min, err := strconv.ParseFloat(r.FormValue("min"), 64); err == nil {
			c.YRange.MinMode.Fixed = true
			c.YRange.MinMode.Value = min
		}
		if max, err := strconv.ParseFloat(r.FormValue("max"), 64); err == nil {
			c.YRange.MaxMode.Fixed = true
			c.YRange.MaxMode.Value = max
		}
		for ri, r := range cs {
			pts := make([]chart.EPoint, len(r.Data))
			for idx, v := range r.Data {
				pts[idx].X = v[0]
				pts[idx].Y = v[1]
			}
			slice.Sort(pts, func(i, j int) bool {
				return pts[i].X < pts[j].X
			})
			c.AddData(r.Name, pts, chart.PlotStyleLinesPoints, sched.Autostyle(ri))
		}
		w.Header().Set("Content-Type", "image/svg+xml")
		white := color.RGBA{0xff, 0xff, 0xff, 0xff}
		const width = 800
		const height = 600
		s := svg.New(w)
		s.Start(width, height)
		s.Rect(0, 0, width, height, "fill: #ffffff")
		sgr := svgg.AddTo(s, 0, 0, width, height, "", 12, white)
		c.Plot(sgr)
		s.End()
		return nil, nil
	}
	return struct {
		Queries []string
		Series  []*chartSeries
	}{
		queries,
		cs,
	}, nil
}