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Refactor gauge and registry to accommodate cumulative. (census-instru…
…mentation#1089) * Refactor gauge and registry to accomodate cummulative. - use common baseMetric type to manage gauge and cumulative. * fix copyright and renamed couple of func.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // Copyright 2019, OpenCensus 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. | ||
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| package metric | ||
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| import ( | ||
| "sync" | ||
| "time" | ||
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| "go.opencensus.io/internal/tagencoding" | ||
| "go.opencensus.io/metric/metricdata" | ||
| ) | ||
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| // baseMetric is common representation for gauge and cumulative metrics. | ||
| // | ||
| // baseMetric maintains a value for each combination of of label values passed to | ||
| // Set, Add, or Inc method. | ||
| // | ||
| // baseMetric should not be used directly, use metric specific type such as | ||
| // Float64Gauge or Int64Gauge. | ||
| type baseMetric struct { | ||
| vals sync.Map | ||
| desc metricdata.Descriptor | ||
| start time.Time | ||
| keys []string | ||
| bmType baseMetricType | ||
| } | ||
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| type baseMetricType int | ||
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| const ( | ||
| gaugeInt64 baseMetricType = iota | ||
| gaugeFloat64 | ||
| derivedGaugeInt64 | ||
| derivedGaugeFloat64 | ||
| cumulativeInt64 | ||
| cumulativeFloat64 | ||
| derivedCumulativeInt64 | ||
| derivedCumulativeFloat64 | ||
| ) | ||
|
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| type baseEntry interface { | ||
| read(t time.Time) metricdata.Point | ||
| } | ||
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| // Read returns the current values of the baseMetric as a metric for export. | ||
| func (bm *baseMetric) read() *metricdata.Metric { | ||
| now := time.Now() | ||
| m := &metricdata.Metric{ | ||
| Descriptor: bm.desc, | ||
| } | ||
| bm.vals.Range(func(k, v interface{}) bool { | ||
| entry := v.(baseEntry) | ||
| key := k.(string) | ||
| labelVals := bm.decodeLabelVals(key) | ||
| m.TimeSeries = append(m.TimeSeries, &metricdata.TimeSeries{ | ||
| StartTime: now, // Gauge value is instantaneous. | ||
| LabelValues: labelVals, | ||
| Points: []metricdata.Point{ | ||
| entry.read(now), | ||
| }, | ||
| }) | ||
| return true | ||
| }) | ||
| return m | ||
| } | ||
|
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| func (bm *baseMetric) encodeLabelVals(labelVals []metricdata.LabelValue) string { | ||
| vb := &tagencoding.Values{} | ||
| for _, v := range labelVals { | ||
| b := make([]byte, 1, len(v.Value)+1) | ||
| if v.Present { | ||
| b[0] = 1 | ||
| b = append(b, []byte(v.Value)...) | ||
| } | ||
| vb.WriteValue(b) | ||
| } | ||
| return string(vb.Bytes()) | ||
| } | ||
|
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| func (bm *baseMetric) decodeLabelVals(s string) []metricdata.LabelValue { | ||
| vals := make([]metricdata.LabelValue, 0, len(bm.keys)) | ||
| vb := &tagencoding.Values{Buffer: []byte(s)} | ||
| for range bm.keys { | ||
| v := vb.ReadValue() | ||
| if v[0] == 0 { | ||
| vals = append(vals, metricdata.LabelValue{}) | ||
| } else { | ||
| vals = append(vals, metricdata.NewLabelValue(string(v[1:]))) | ||
| } | ||
| } | ||
| return vals | ||
| } | ||
|
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| func (bm *baseMetric) entryForValues(labelVals []metricdata.LabelValue, newEntry func() baseEntry) (interface{}, error) { | ||
| if len(labelVals) != len(bm.keys) { | ||
| return nil, errKeyValueMismatch | ||
| } | ||
| mapKey := bm.encodeLabelVals(labelVals) | ||
| if entry, ok := bm.vals.Load(mapKey); ok { | ||
| return entry, nil | ||
| } | ||
| entry, _ := bm.vals.LoadOrStore(mapKey, newEntry()) | ||
| return entry, nil | ||
| } | ||
|
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| func (bm *baseMetric) upsertEntry(labelVals []metricdata.LabelValue, newEntry func() baseEntry) error { | ||
| if len(labelVals) != len(bm.keys) { | ||
| return errKeyValueMismatch | ||
| } | ||
| mapKey := bm.encodeLabelVals(labelVals) | ||
| bm.vals.Delete(mapKey) | ||
| bm.vals.Store(mapKey, newEntry()) | ||
| return nil | ||
| } |
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