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histograms.go
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/
histograms.go
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package metric
import (
"github.com/mitchellh/mapstructure"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
)
type HistogramConfig struct {
Value *string `mapstructure:"value"`
Buckets []float64 `mapstructure:"buckets"`
}
func validateHistogramConfig(config *HistogramConfig) error {
return nil
}
func parseHistogramConfig(config interface{}) (*HistogramConfig, error) {
cfg := &HistogramConfig{}
err := mapstructure.Decode(config, cfg)
if err != nil {
return nil, err
}
return cfg, nil
}
// Histograms is a vector of histograms for a each log stream.
type Histograms struct {
*metricVec
Cfg *HistogramConfig
}
// NewHistograms creates a new histogram vec.
func NewHistograms(name, help string, config interface{}) (*Histograms, error) {
cfg, err := parseHistogramConfig(config)
if err != nil {
return nil, err
}
err = validateHistogramConfig(cfg)
if err != nil {
return nil, err
}
return &Histograms{
metricVec: newMetricVec(func(labels map[string]string) prometheus.Metric {
return prometheus.NewHistogram(prometheus.HistogramOpts{
Help: help,
Name: name,
ConstLabels: labels,
Buckets: cfg.Buckets,
})
}),
Cfg: cfg,
}, nil
}
// With returns the histogram associated with a stream labelset.
func (h *Histograms) With(labels model.LabelSet) prometheus.Histogram {
return h.metricVec.With(labels).(prometheus.Histogram)
}