// MarshalJSON implements the "encoding/json".Marshaler interface for
// ValueList.
func (vl *ValueList) MarshalJSON() ([]byte, error) {
jvl := jsonValueList{
Values: make([]json.Number, len(vl.Values)),
DSTypes: make([]string, len(vl.Values)),
DSNames: make([]string, len(vl.Values)),
Time: cdtime.New(vl.Time),
Interval: cdtime.NewDuration(vl.Interval),
Host: vl.Host,
Plugin: vl.Plugin,
PluginInstance: vl.PluginInstance,
Type: vl.Type,
TypeInstance: vl.TypeInstance,
}
for i, v := range vl.Values {
switch v := v.(type) {
case Gauge:
jvl.Values[i] = json.Number(fmt.Sprintf("%.15g", v))
case Derive:
jvl.Values[i] = json.Number(fmt.Sprintf("%d", v))
case Counter:
jvl.Values[i] = json.Number(fmt.Sprintf("%d", v))
default:
return nil, fmt.Errorf("unexpected data source type: %T", v)
}
jvl.DSTypes[i] = v.Type()
jvl.DSNames[i] = vl.DSName(i)
}
return json.Marshal(jvl)
}
func (b *Buffer) writeInterval(d time.Duration) error {
if b.state.Interval == d {
return nil
}
b.state.Interval = d
return b.writeInt(typeIntervalHR, uint64(cdtime.NewDuration(d)))
}