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// Copyright 2017 The etcd Authors
//
// 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.
// the file is borrowed from github.com/rakyll/boom/boomer/print.go
package report
import (
"time"
)
type weightedReport struct {
baseReport Report
report *report
results chan Result
weightTotal float64
}
// NewWeightedReport returns a report that includes
// both weighted and unweighted statistics.
func NewWeightedReport(r Report, precision string) Report {
return &weightedReport{
baseReport: r,
report: newReport(precision),
results: make(chan Result, 16),
}
}
func (wr *weightedReport) Results() chan<- Result { return wr.results }
func (wr *weightedReport) Run() <-chan string {
donec := make(chan string, 2)
go func() {
defer close(donec)
basec, rc := make(chan string, 1), make(chan Stats, 1)
go func() { basec <- (<-wr.baseReport.Run()) }()
go func() { rc <- (<-wr.report.Stats()) }()
go wr.processResults()
wr.report.stats = wr.reweighStat(<-rc)
donec <- wr.report.String()
donec <- (<-basec)
}()
return donec
}
func (wr *weightedReport) Stats() <-chan Stats {
donec := make(chan Stats, 2)
go func() {
defer close(donec)
basec, rc := make(chan Stats, 1), make(chan Stats, 1)
go func() { basec <- (<-wr.baseReport.Stats()) }()
go func() { rc <- (<-wr.report.Stats()) }()
go wr.processResults()
donec <- wr.reweighStat(<-rc)
donec <- (<-basec)
}()
return donec
}
func (wr *weightedReport) processResults() {
defer close(wr.report.results)
defer close(wr.baseReport.Results())
for res := range wr.results {
wr.processResult(res)
wr.baseReport.Results() <- res
}
}
func (wr *weightedReport) processResult(res Result) {
if res.Err != nil {
wr.report.results <- res
return
}
if res.Weight == 0 {
res.Weight = 1.0
}
wr.weightTotal += res.Weight
res.End = res.Start.Add(time.Duration(float64(res.End.Sub(res.Start)) / res.Weight))
res.Weight = 1.0
wr.report.results <- res
}
func (wr *weightedReport) reweighStat(s Stats) Stats {
weightCoef := wr.weightTotal / float64(len(s.Lats))
// weight > 1 => processing more than one request
s.RPS *= weightCoef
s.AvgTotal *= weightCoef * weightCoef
return s
}
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