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snapshot.go
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snapshot.go
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package openmetrics
type snapshot struct {
desc Desc
mt MetricType
pts []MetricPoint
lvs [][]string
off []int
cos uint64Slice
}
func (s *snapshot) Reset(desc Desc, mt MetricType) {
*s = snapshot{
desc: desc,
mt: mt,
pts: s.pts[:0],
lvs: s.lvs[:0],
off: s.off[:0],
cos: s.cos[:0],
}
}
func (s *snapshot) Append(m *metricWithLabels) (err error) {
// append points, exit early if none collected
origSize := len(s.pts)
s.pts, err = m.met.AppendPoints(s.pts, &s.desc)
if err != nil || len(s.pts) == origSize {
return
}
s.off = append(s.off, len(s.pts))
s.lvs = append(s.lvs, m.lvs)
return
}
func (s *snapshot) WriteTo(bw *bufferedWriter) (total int64, err error) {
if len(s.pts) == 0 {
return
}
var n int
n, err = s.desc.writeTo(bw, s.mt)
total += int64(n)
if err != nil {
return
}
off := 0
for i, max := range s.off {
lvs := s.lvs[i]
for ; off < max; off++ {
pt := s.pts[off]
n, err = bw.WritePoint(s.desc.Name, s.desc.Unit, s.desc.Labels, lvs, &pt)
total += int64(n)
if err != nil {
return
}
}
}
return
}