/
drop_function.go
47 lines (42 loc) · 1.33 KB
/
drop_function.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 forecast
import (
"math"
"time"
"github.com/square/metrics/api"
"github.com/square/metrics/function"
)
var FunctionDrop = function.MakeFunction(
"forecast.drop",
func(timerange api.Timerange, original api.SeriesList, dropTime time.Duration) api.SeriesList {
lastValue := float64(timerange.Slots()) - dropTime.Seconds()/timerange.Resolution().Seconds()
result := make([]api.Timeseries, len(original.Series))
for i, series := range original.Series {
values := make([]float64, len(series.Values))
result[i] = series
for j := range values {
if float64(j) < lastValue {
values[j] = series.Values[j]
} else {
values[j] = math.NaN()
}
}
result[i].Values = values
}
return api.SeriesList{
Series: result,
}
},
)