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path: root/vendor/github.com/rcrowley/go-metrics/json.go
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package metrics

import (
    "encoding/json"
    "io"
    "time"
)

// MarshalJSON returns a byte slice containing a JSON representation of all
// the metrics in the Registry.
func (r *StandardRegistry) MarshalJSON() ([]byte, error) {
    data := make(map[string]map[string]interface{})
    r.Each(func(name string, i interface{}) {
        values := make(map[string]interface{})
        switch metric := i.(type) {
        case Counter:
            values["count"] = metric.Count()
        case Gauge:
            values["value"] = metric.Value()
        case GaugeFloat64:
            values["value"] = metric.Value()
        case Healthcheck:
            values["error"] = nil
            metric.Check()
            if err := metric.Error(); nil != err {
                values["error"] = metric.Error().Error()
            }
        case Histogram:
            h := metric.Snapshot()
            ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
            values["count"] = h.Count()
            values["min"] = h.Min()
            values["max"] = h.Max()
            values["mean"] = h.Mean()
            values["stddev"] = h.StdDev()
            values["median"] = ps[0]
            values["75%"] = ps[1]
            values["95%"] = ps[2]
            values["99%"] = ps[3]
            values["99.9%"] = ps[4]
        case Meter:
            m := metric.Snapshot()
            values["count"] = m.Count()
            values["1m.rate"] = m.Rate1()
            values["5m.rate"] = m.Rate5()
            values["15m.rate"] = m.Rate15()
            values["mean.rate"] = m.RateMean()
        case Timer:
            t := metric.Snapshot()
            ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
            values["count"] = t.Count()
            values["min"] = t.Min()
            values["max"] = t.Max()
            values["mean"] = t.Mean()
            values["stddev"] = t.StdDev()
            values["median"] = ps[0]
            values["75%"] = ps[1]
            values["95%"] = ps[2]
            values["99%"] = ps[3]
            values["99.9%"] = ps[4]
            values["1m.rate"] = t.Rate1()
            values["5m.rate"] = t.Rate5()
            values["15m.rate"] = t.Rate15()
            values["mean.rate"] = t.RateMean()
        }
        data[name] = values
    })
    return json.Marshal(data)
}

// WriteJSON writes metrics from the given registry  periodically to the
// specified io.Writer as JSON.
func WriteJSON(r Registry, d time.Duration, w io.Writer) {
    for _ = range time.Tick(d) {
        WriteJSONOnce(r, w)
    }
}

// WriteJSONOnce writes metrics from the given registry to the specified
// io.Writer as JSON.
func WriteJSONOnce(r Registry, w io.Writer) {
    json.NewEncoder(w).Encode(r)
}

func (p *PrefixedRegistry) MarshalJSON() ([]byte, error) {
    return json.Marshal(p.underlying)
}