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) {
    return json.Marshal(r.GetAll())
}

// 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.GetAll())
}