github.com/jonaz/heapster@v1.3.0-beta.0.0.20170208112634-cd3c15ca3d29/metrics/processors/rate_calculator.go (about) 1 // Copyright 2015 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package processors 16 17 import ( 18 "k8s.io/heapster/metrics/core" 19 20 "github.com/golang/glog" 21 ) 22 23 type RateCalculator struct { 24 rateMetricsMapping map[string]core.Metric 25 previousBatch *core.DataBatch 26 } 27 28 func (this *RateCalculator) Name() string { 29 return "rate calculator" 30 } 31 32 func (this *RateCalculator) Process(batch *core.DataBatch) (*core.DataBatch, error) { 33 if this.previousBatch == nil { 34 this.previousBatch = batch 35 return batch, nil 36 } 37 if !batch.Timestamp.After(this.previousBatch.Timestamp) { 38 // something got out of sync, do nothing. 39 glog.Errorf("New data batch has timestamp before the previous one: new:%v old:%v", batch.Timestamp, this.previousBatch.Timestamp) 40 return batch, nil 41 } 42 43 for key, newMs := range batch.MetricSets { 44 45 if oldMs, found := this.previousBatch.MetricSets[key]; found { 46 if !newMs.ScrapeTime.After(oldMs.ScrapeTime) { 47 // New must be strictly after old. 48 continue 49 } 50 if !newMs.CreateTime.Equal(oldMs.CreateTime) { 51 glog.V(4).Infof("Skipping rates for %s - different create time new:%v old:%v", key, newMs.CreateTime, oldMs.CreateTime) 52 // Create time for container must be the same. 53 continue 54 } 55 56 for metricName, targetMetric := range this.rateMetricsMapping { 57 metricValNew, foundNew := newMs.MetricValues[metricName] 58 metricValOld, foundOld := oldMs.MetricValues[metricName] 59 if foundNew && foundOld { 60 if metricName == core.MetricCpuUsage.MetricDescriptor.Name { 61 // cpu/usage values are in nanoseconds; we want to have it in millicores (that's why constant 1000 is here). 62 newVal := 1000 * (metricValNew.IntValue - metricValOld.IntValue) / 63 (newMs.ScrapeTime.UnixNano() - oldMs.ScrapeTime.UnixNano()) 64 65 newMs.MetricValues[targetMetric.MetricDescriptor.Name] = core.MetricValue{ 66 ValueType: core.ValueInt64, 67 MetricType: core.MetricGauge, 68 IntValue: newVal, 69 } 70 71 } else if targetMetric.MetricDescriptor.ValueType == core.ValueFloat { 72 newVal := 1e9 * float32(metricValNew.IntValue-metricValOld.IntValue) / 73 float32(newMs.ScrapeTime.UnixNano()-oldMs.ScrapeTime.UnixNano()) 74 75 newMs.MetricValues[targetMetric.MetricDescriptor.Name] = core.MetricValue{ 76 ValueType: core.ValueFloat, 77 MetricType: core.MetricGauge, 78 FloatValue: newVal, 79 } 80 } 81 } 82 } 83 } 84 } 85 this.previousBatch = batch 86 return batch, nil 87 } 88 89 func NewRateCalculator(metrics map[string]core.Metric) *RateCalculator { 90 return &RateCalculator{ 91 rateMetricsMapping: metrics, 92 } 93 }