forked from TrueCloudLab/distribution
83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package metrics
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import (
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"encoding/json"
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"io"
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"time"
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)
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// MarshalJSON returns a byte slice containing a JSON representation of all
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// the metrics in the Registry.
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func (r StandardRegistry) MarshalJSON() ([]byte, error) {
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data := make(map[string]map[string]interface{})
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r.Each(func(name string, i interface{}) {
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values := make(map[string]interface{})
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switch metric := i.(type) {
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case Counter:
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values["count"] = metric.Count()
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case Gauge:
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values["value"] = metric.Value()
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case GaugeFloat64:
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values["value"] = metric.Value()
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case Healthcheck:
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values["error"] = nil
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metric.Check()
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if err := metric.Error(); nil != err {
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values["error"] = metric.Error().Error()
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}
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case Histogram:
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h := metric.Snapshot()
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ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
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values["count"] = h.Count()
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values["min"] = h.Min()
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values["max"] = h.Max()
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values["mean"] = h.Mean()
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values["stddev"] = h.StdDev()
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values["median"] = ps[0]
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values["75%"] = ps[1]
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values["95%"] = ps[2]
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values["99%"] = ps[3]
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values["99.9%"] = ps[4]
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case Meter:
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m := metric.Snapshot()
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values["count"] = m.Count()
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values["1m.rate"] = m.Rate1()
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values["5m.rate"] = m.Rate5()
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values["15m.rate"] = m.Rate15()
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values["mean.rate"] = m.RateMean()
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case Timer:
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t := metric.Snapshot()
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ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
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values["count"] = t.Count()
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values["min"] = t.Min()
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values["max"] = t.Max()
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values["mean"] = t.Mean()
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values["stddev"] = t.StdDev()
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values["median"] = ps[0]
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values["75%"] = ps[1]
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values["95%"] = ps[2]
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values["99%"] = ps[3]
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values["99.9%"] = ps[4]
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values["1m.rate"] = t.Rate1()
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values["5m.rate"] = t.Rate5()
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values["15m.rate"] = t.Rate15()
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values["mean.rate"] = t.RateMean()
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}
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data[name] = values
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})
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return json.Marshal(data)
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}
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// WriteJSON writes metrics from the given registry periodically to the
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// specified io.Writer as JSON.
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func WriteJSON(r Registry, d time.Duration, w io.Writer) {
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for _ = range time.Tick(d) {
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WriteJSONOnce(r, w)
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}
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}
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// WriteJSONOnce writes metrics from the given registry to the specified
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// io.Writer as JSON.
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func WriteJSONOnce(r Registry, w io.Writer) {
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json.NewEncoder(w).Encode(r)
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}
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