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add OpenCensus metric exporter bridge
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| // Copyright The OpenTelemetry 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. | ||
|
|
||
| package opencensus | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "go.opencensus.io/metric/metricdata" | ||
|
|
||
| "go.opentelemetry.io/otel/metric/number" | ||
| "go.opentelemetry.io/otel/sdk/export/metric/aggregation" | ||
| ) | ||
|
|
||
| var ( | ||
| errIncompatibleType = errors.New("incompatible type for aggregation") | ||
| errEmpty = errors.New("points may not be empty") | ||
| errBadPoint = errors.New("point cannot be converted") | ||
| ) | ||
|
|
||
| // aggregationWithEndTime is an aggregation that can also provide the timestamp | ||
| // of the last recorded point. | ||
| type aggregationWithEndTime interface { | ||
| aggregation.Aggregation | ||
| end() time.Time | ||
| } | ||
|
|
||
| // newAggregationFromPoints creates an OpenTelemetry aggregation from | ||
| // OpenCensus points. Points may not be empty. | ||
| func newAggregationFromPoints(points []metricdata.Point) (aggregationWithEndTime, error) { | ||
| if len(points) == 0 { | ||
| return nil, errEmpty | ||
| } | ||
| switch t := points[0].Value.(type) { | ||
| case int64: | ||
| return newExactAggregator(points) | ||
| case float64: | ||
| return newExactAggregator(points) | ||
| case *metricdata.Distribution: | ||
| return newDistributionAggregator(points) | ||
| default: | ||
| // TODO add *metricdata.Summary support | ||
| return nil, fmt.Errorf("%w: %v", errIncompatibleType, t) | ||
| } | ||
| } | ||
|
|
||
| var _ aggregation.Aggregation = &ocExactAggregator{} | ||
| var _ aggregation.LastValue = &ocExactAggregator{} | ||
| var _ aggregation.Points = &ocExactAggregator{} | ||
|
|
||
| // newExactAggregator creates an OpenTelemetry aggreation from OpenCensus points. | ||
| // Points may not be empty, and must only contain integers or floats. | ||
| func newExactAggregator(pts []metricdata.Point) (aggregationWithEndTime, error) { | ||
| points := make([]number.Number, len(pts)) | ||
| for i, pt := range pts { | ||
| switch t := pt.Value.(type) { | ||
| case int64: | ||
| points[i] = number.NewInt64Number(pt.Value.(int64)) | ||
| case float64: | ||
| points[i] = number.NewFloat64Number(pt.Value.(float64)) | ||
| default: | ||
| return nil, fmt.Errorf("%w: %v", errIncompatibleType, t) | ||
| } | ||
| } | ||
| return &ocExactAggregator{ | ||
| points: points, | ||
| endTime: pts[len(pts)-1].Time, | ||
| }, nil | ||
| } | ||
|
|
||
| type ocExactAggregator struct { | ||
| points []number.Number | ||
| endTime time.Time | ||
| } | ||
|
|
||
| // Kind returns the kind of aggregation this is. | ||
| func (o *ocExactAggregator) Kind() aggregation.Kind { | ||
| return aggregation.ExactKind | ||
| } | ||
|
|
||
| // Points returns access to the raw data set. | ||
| func (o *ocExactAggregator) Points() ([]number.Number, error) { | ||
| return o.points, nil | ||
| } | ||
|
|
||
| // LastValue returns the last point. | ||
| func (o *ocExactAggregator) LastValue() (number.Number, time.Time, error) { | ||
| last := o.points[len(o.points)-1] | ||
| return last, o.endTime, nil | ||
| } | ||
|
|
||
| // end returns the timestamp of the last point | ||
| func (o *ocExactAggregator) end() time.Time { | ||
| return o.endTime | ||
| } | ||
|
|
||
| var _ aggregation.Aggregation = &ocDistAggregator{} | ||
| var _ aggregation.Histogram = &ocDistAggregator{} | ||
|
|
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| // newDistributionAggregator creates an OpenTelemetry aggreation from | ||
| // OpenCensus points. Points may not be empty, and must only contain | ||
| // Distributions. The most recent disribution will be used in the aggregation. | ||
| func newDistributionAggregator(pts []metricdata.Point) (aggregationWithEndTime, error) { | ||
| // only use the most recent datapoint for now. | ||
| pt := pts[len(pts)-1] | ||
| val, ok := pt.Value.(*metricdata.Distribution) | ||
| if !ok { | ||
| return nil, fmt.Errorf("%w: %v", errBadPoint, pt.Value) | ||
| } | ||
| bucketCounts := make([]uint64, len(val.Buckets)) | ||
| for i, bucket := range val.Buckets { | ||
| if bucket.Count < 0 { | ||
| return nil, fmt.Errorf("%w: bucket count may not be negative", errBadPoint) | ||
| } | ||
| bucketCounts[i] = uint64(bucket.Count) | ||
| } | ||
| if val.Count < 0 { | ||
| return nil, fmt.Errorf("%w: count may not be negative", errBadPoint) | ||
| } | ||
| return &ocDistAggregator{ | ||
| sum: number.NewFloat64Number(val.Sum), | ||
| count: uint64(val.Count), | ||
| buckets: aggregation.Buckets{ | ||
| Boundaries: val.BucketOptions.Bounds, | ||
| Counts: bucketCounts, | ||
| }, | ||
| endTime: pts[len(pts)-1].Time, | ||
| }, nil | ||
| } | ||
|
|
||
| type ocDistAggregator struct { | ||
| sum number.Number | ||
| count uint64 | ||
| buckets aggregation.Buckets | ||
| endTime time.Time | ||
| } | ||
|
|
||
| // Kind returns the kind of aggregation this is. | ||
| func (o *ocDistAggregator) Kind() aggregation.Kind { | ||
| return aggregation.HistogramKind | ||
| } | ||
|
|
||
| // Sum returns the sum of values. | ||
| func (o *ocDistAggregator) Sum() (number.Number, error) { | ||
| return o.sum, nil | ||
| } | ||
|
|
||
| // Count returns the number of values. | ||
| func (o *ocDistAggregator) Count() (uint64, error) { | ||
| return o.count, nil | ||
| } | ||
|
|
||
| // Histogram returns the count of events in pre-determined buckets. | ||
| func (o *ocDistAggregator) Histogram() (aggregation.Buckets, error) { | ||
| return o.buckets, nil | ||
| } | ||
|
|
||
| // end returns the time the histogram was measured. | ||
| func (o *ocDistAggregator) end() time.Time { | ||
| return o.endTime | ||
| } |
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