/
scalarset.go
91 lines (84 loc) · 2.31 KB
/
scalarset.go
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// Copyright 2015 - 2016 Square Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package function
import (
"bytes"
"encoding/json"
"math"
"strconv"
"time"
"github.com/square/metrics/api"
)
type TaggedScalar struct {
TagSet api.TagSet
Value float64
}
// MarshalJSON for TaggedScalar marshals NaN or infinity to null.
func (ts TaggedScalar) MarshalJSON() ([]byte, error) {
var buffer bytes.Buffer
buffer.WriteString(`{"tagset":`)
tagset, err := json.Marshal(ts.TagSet)
if err != nil {
return nil, err
}
buffer.Write(tagset)
buffer.WriteString(`,"value":`)
if math.IsInf(ts.Value, 0) || math.IsNaN(ts.Value) {
buffer.WriteString(`null`)
} else {
buffer.WriteString(strconv.FormatFloat(ts.Value, 'g', -1, 64))
}
buffer.WriteString("}")
return buffer.Bytes(), nil
}
type ScalarSet []TaggedScalar
func (set ScalarSet) ToSeriesList(timerange api.Timerange) (api.SeriesList, *ConversionFailure) {
list := api.SeriesList{
Series: make([]api.Timeseries, len(set)),
}
for i := range list.Series {
list.Series[i] = api.Timeseries{
TagSet: set[i].TagSet,
Values: make([]float64, timerange.Slots()),
}
for j := range list.Series[i].Values {
list.Series[i].Values[j] = set[i].Value
}
}
return list, nil
}
func (set ScalarSet) ToString() (string, *ConversionFailure) {
return "", &ConversionFailure{
From: "scalar set",
To: "string",
}
}
func (set ScalarSet) ToScalar() (float64, *ConversionFailure) {
if len(set) == 1 && set[0].TagSet.Equals(api.TagSet{}) {
return set[0].Value, nil
}
return 0, &ConversionFailure{
From: "scalar set",
To: "scalar",
}
}
func (set ScalarSet) ToScalarSet() (ScalarSet, *ConversionFailure) {
return set, nil
}
func (set ScalarSet) ToDuration() (time.Duration, *ConversionFailure) {
return 0, &ConversionFailure{
From: "scalar set",
To: "duration",
}
}