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
}
// 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
}