mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
441 lines
13 KiB
Go
441 lines
13 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package metrictransform provides translations for opentelemetry-go concepts and
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// structures to otlp structures.
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package metrictransform // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/metrictransform"
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"sync"
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"time"
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"go.opentelemetry.io/otel/metric/number"
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"go.opentelemetry.io/otel/sdk/instrumentation"
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"go.opentelemetry.io/otel/sdk/metric/export"
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"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
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"go.opentelemetry.io/otel/sdk/resource"
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commonpb "go.opentelemetry.io/proto/otlp/common/v1"
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metricpb "go.opentelemetry.io/proto/otlp/metrics/v1"
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)
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var (
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// ErrUnimplementedAgg is returned when a transformation of an unimplemented
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// aggregator is attempted.
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ErrUnimplementedAgg = errors.New("unimplemented aggregator")
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// ErrIncompatibleAgg is returned when
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// aggregation.Kind implies an interface conversion that has
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// failed
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ErrIncompatibleAgg = errors.New("incompatible aggregation type")
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// ErrUnknownValueType is returned when a transformation of an unknown value
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// is attempted.
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ErrUnknownValueType = errors.New("invalid value type")
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// ErrContextCanceled is returned when a context cancellation halts a
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// transformation.
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ErrContextCanceled = errors.New("context canceled")
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// ErrTransforming is returned when an unexected error is encountered transforming.
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ErrTransforming = errors.New("transforming failed")
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)
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// result is the product of transforming Records into OTLP Metrics.
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type result struct {
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Metric *metricpb.Metric
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Err error
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}
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// toNanos returns the number of nanoseconds since the UNIX epoch.
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func toNanos(t time.Time) uint64 {
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if t.IsZero() {
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return 0
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}
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return uint64(t.UnixNano())
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}
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// InstrumentationLibraryReader transforms all records contained in a checkpoint into
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// batched OTLP ResourceMetrics.
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func InstrumentationLibraryReader(ctx context.Context, temporalitySelector aggregation.TemporalitySelector, res *resource.Resource, ilmr export.InstrumentationLibraryReader, numWorkers uint) (*metricpb.ResourceMetrics, error) {
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var ilms []*metricpb.InstrumentationLibraryMetrics
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err := ilmr.ForEach(func(lib instrumentation.Library, mr export.Reader) error {
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records, errc := source(ctx, temporalitySelector, mr)
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// Start a fixed number of goroutines to transform records.
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transformed := make(chan result)
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var wg sync.WaitGroup
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wg.Add(int(numWorkers))
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for i := uint(0); i < numWorkers; i++ {
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go func() {
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defer wg.Done()
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transformer(ctx, temporalitySelector, records, transformed)
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}()
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}
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go func() {
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wg.Wait()
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close(transformed)
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}()
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// Synchronously collect the transformed records and transmit.
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ms, err := sink(ctx, transformed)
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if err != nil {
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return nil
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}
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// source is complete, check for any errors.
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if err := <-errc; err != nil {
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return err
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}
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if len(ms) == 0 {
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return nil
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}
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ilms = append(ilms, &metricpb.InstrumentationLibraryMetrics{
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Metrics: ms,
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SchemaUrl: lib.SchemaURL,
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InstrumentationLibrary: &commonpb.InstrumentationLibrary{
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Name: lib.Name,
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Version: lib.Version,
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},
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})
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return nil
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})
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if len(ilms) == 0 {
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return nil, err
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}
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rms := &metricpb.ResourceMetrics{
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Resource: Resource(res),
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SchemaUrl: res.SchemaURL(),
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InstrumentationLibraryMetrics: ilms,
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}
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return rms, err
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}
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// source starts a goroutine that sends each one of the Records yielded by
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// the Reader on the returned chan. Any error encountered will be sent
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// on the returned error chan after seeding is complete.
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func source(ctx context.Context, temporalitySelector aggregation.TemporalitySelector, mr export.Reader) (<-chan export.Record, <-chan error) {
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errc := make(chan error, 1)
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out := make(chan export.Record)
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// Seed records into process.
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go func() {
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defer close(out)
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// No select is needed since errc is buffered.
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errc <- mr.ForEach(temporalitySelector, func(r export.Record) error {
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select {
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case <-ctx.Done():
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return ErrContextCanceled
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case out <- r:
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}
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return nil
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})
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}()
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return out, errc
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}
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// transformer transforms records read from the passed in chan into
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// OTLP Metrics which are sent on the out chan.
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func transformer(ctx context.Context, temporalitySelector aggregation.TemporalitySelector, in <-chan export.Record, out chan<- result) {
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for r := range in {
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m, err := Record(temporalitySelector, r)
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// Propagate errors, but do not send empty results.
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if err == nil && m == nil {
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continue
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}
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res := result{
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Metric: m,
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Err: err,
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}
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select {
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case <-ctx.Done():
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return
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case out <- res:
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}
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}
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}
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// sink collects transformed Records and batches them.
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//
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// Any errors encountered transforming input will be reported with an
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// ErrTransforming as well as the completed ResourceMetrics. It is up to the
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// caller to handle any incorrect data in these ResourceMetric.
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func sink(ctx context.Context, in <-chan result) ([]*metricpb.Metric, error) {
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var errStrings []string
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// Group by the MetricDescriptor.
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grouped := map[string]*metricpb.Metric{}
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for res := range in {
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if res.Err != nil {
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errStrings = append(errStrings, res.Err.Error())
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continue
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}
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mID := res.Metric.GetName()
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m, ok := grouped[mID]
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if !ok {
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grouped[mID] = res.Metric
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continue
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}
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// Note: There is extra work happening in this code
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// that can be improved when the work described in
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// #2119 is completed. The SDK has a guarantee that
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// no more than one point per period per label set is
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// produced, so this fallthrough should never happen.
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// The final step of #2119 is to remove all the
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// grouping logic here.
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switch res.Metric.Data.(type) {
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case *metricpb.Metric_Gauge:
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m.GetGauge().DataPoints = append(m.GetGauge().DataPoints, res.Metric.GetGauge().DataPoints...)
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case *metricpb.Metric_Sum:
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m.GetSum().DataPoints = append(m.GetSum().DataPoints, res.Metric.GetSum().DataPoints...)
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case *metricpb.Metric_Histogram:
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m.GetHistogram().DataPoints = append(m.GetHistogram().DataPoints, res.Metric.GetHistogram().DataPoints...)
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case *metricpb.Metric_Summary:
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m.GetSummary().DataPoints = append(m.GetSummary().DataPoints, res.Metric.GetSummary().DataPoints...)
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default:
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err := fmt.Sprintf("unsupported metric type: %T", res.Metric.Data)
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errStrings = append(errStrings, err)
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}
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}
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if len(grouped) == 0 {
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return nil, nil
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}
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ms := make([]*metricpb.Metric, 0, len(grouped))
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for _, m := range grouped {
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ms = append(ms, m)
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}
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// Report any transform errors.
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if len(errStrings) > 0 {
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return ms, fmt.Errorf("%w:\n -%s", ErrTransforming, strings.Join(errStrings, "\n -"))
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}
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return ms, nil
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}
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// Record transforms a Record into an OTLP Metric. An ErrIncompatibleAgg
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// error is returned if the Record Aggregator is not supported.
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func Record(temporalitySelector aggregation.TemporalitySelector, r export.Record) (*metricpb.Metric, error) {
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agg := r.Aggregation()
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switch agg.Kind() {
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case aggregation.HistogramKind:
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h, ok := agg.(aggregation.Histogram)
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if !ok {
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return nil, fmt.Errorf("%w: %T", ErrIncompatibleAgg, agg)
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}
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return histogramPoint(r, temporalitySelector.TemporalityFor(r.Descriptor(), aggregation.HistogramKind), h)
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case aggregation.SumKind:
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s, ok := agg.(aggregation.Sum)
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if !ok {
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return nil, fmt.Errorf("%w: %T", ErrIncompatibleAgg, agg)
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}
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sum, err := s.Sum()
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if err != nil {
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return nil, err
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}
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return sumPoint(r, sum, r.StartTime(), r.EndTime(), temporalitySelector.TemporalityFor(r.Descriptor(), aggregation.SumKind), r.Descriptor().InstrumentKind().Monotonic())
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case aggregation.LastValueKind:
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lv, ok := agg.(aggregation.LastValue)
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if !ok {
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return nil, fmt.Errorf("%w: %T", ErrIncompatibleAgg, agg)
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}
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value, tm, err := lv.LastValue()
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if err != nil {
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return nil, err
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}
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return gaugePoint(r, value, time.Time{}, tm)
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default:
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return nil, fmt.Errorf("%w: %T", ErrUnimplementedAgg, agg)
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}
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}
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func gaugePoint(record export.Record, num number.Number, start, end time.Time) (*metricpb.Metric, error) {
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desc := record.Descriptor()
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labels := record.Labels()
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m := &metricpb.Metric{
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Name: desc.Name(),
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Description: desc.Description(),
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Unit: string(desc.Unit()),
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}
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switch n := desc.NumberKind(); n {
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case number.Int64Kind:
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m.Data = &metricpb.Metric_Gauge{
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Gauge: &metricpb.Gauge{
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DataPoints: []*metricpb.NumberDataPoint{
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{
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Value: &metricpb.NumberDataPoint_AsInt{
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AsInt: num.CoerceToInt64(n),
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},
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Attributes: Iterator(labels.Iter()),
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StartTimeUnixNano: toNanos(start),
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TimeUnixNano: toNanos(end),
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},
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},
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},
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}
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case number.Float64Kind:
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m.Data = &metricpb.Metric_Gauge{
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Gauge: &metricpb.Gauge{
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DataPoints: []*metricpb.NumberDataPoint{
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{
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Value: &metricpb.NumberDataPoint_AsDouble{
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AsDouble: num.CoerceToFloat64(n),
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},
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Attributes: Iterator(labels.Iter()),
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StartTimeUnixNano: toNanos(start),
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TimeUnixNano: toNanos(end),
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},
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},
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},
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}
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default:
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return nil, fmt.Errorf("%w: %v", ErrUnknownValueType, n)
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}
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return m, nil
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}
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func sdkTemporalityToTemporality(temporality aggregation.Temporality) metricpb.AggregationTemporality {
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switch temporality {
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case aggregation.DeltaTemporality:
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return metricpb.AggregationTemporality_AGGREGATION_TEMPORALITY_DELTA
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case aggregation.CumulativeTemporality:
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return metricpb.AggregationTemporality_AGGREGATION_TEMPORALITY_CUMULATIVE
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}
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return metricpb.AggregationTemporality_AGGREGATION_TEMPORALITY_UNSPECIFIED
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}
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func sumPoint(record export.Record, num number.Number, start, end time.Time, temporality aggregation.Temporality, monotonic bool) (*metricpb.Metric, error) {
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desc := record.Descriptor()
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labels := record.Labels()
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m := &metricpb.Metric{
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Name: desc.Name(),
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Description: desc.Description(),
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Unit: string(desc.Unit()),
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}
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switch n := desc.NumberKind(); n {
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case number.Int64Kind:
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m.Data = &metricpb.Metric_Sum{
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Sum: &metricpb.Sum{
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IsMonotonic: monotonic,
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AggregationTemporality: sdkTemporalityToTemporality(temporality),
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DataPoints: []*metricpb.NumberDataPoint{
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{
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Value: &metricpb.NumberDataPoint_AsInt{
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AsInt: num.CoerceToInt64(n),
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},
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Attributes: Iterator(labels.Iter()),
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StartTimeUnixNano: toNanos(start),
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TimeUnixNano: toNanos(end),
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},
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},
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},
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}
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case number.Float64Kind:
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m.Data = &metricpb.Metric_Sum{
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Sum: &metricpb.Sum{
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IsMonotonic: monotonic,
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AggregationTemporality: sdkTemporalityToTemporality(temporality),
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DataPoints: []*metricpb.NumberDataPoint{
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{
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Value: &metricpb.NumberDataPoint_AsDouble{
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AsDouble: num.CoerceToFloat64(n),
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},
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Attributes: Iterator(labels.Iter()),
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StartTimeUnixNano: toNanos(start),
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TimeUnixNano: toNanos(end),
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},
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},
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},
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}
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default:
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return nil, fmt.Errorf("%w: %v", ErrUnknownValueType, n)
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}
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return m, nil
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}
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func histogramValues(a aggregation.Histogram) (boundaries []float64, counts []uint64, err error) {
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var buckets aggregation.Buckets
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if buckets, err = a.Histogram(); err != nil {
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return
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}
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boundaries, counts = buckets.Boundaries, buckets.Counts
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if len(counts) != len(boundaries)+1 {
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err = ErrTransforming
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return
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}
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return
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}
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// histogram transforms a Histogram Aggregator into an OTLP Metric.
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func histogramPoint(record export.Record, temporality aggregation.Temporality, a aggregation.Histogram) (*metricpb.Metric, error) {
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desc := record.Descriptor()
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labels := record.Labels()
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boundaries, counts, err := histogramValues(a)
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if err != nil {
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return nil, err
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}
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count, err := a.Count()
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if err != nil {
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return nil, err
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}
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sum, err := a.Sum()
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if err != nil {
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return nil, err
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}
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m := &metricpb.Metric{
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Name: desc.Name(),
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Description: desc.Description(),
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Unit: string(desc.Unit()),
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Data: &metricpb.Metric_Histogram{
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Histogram: &metricpb.Histogram{
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AggregationTemporality: sdkTemporalityToTemporality(temporality),
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DataPoints: []*metricpb.HistogramDataPoint{
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{
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Sum: sum.CoerceToFloat64(desc.NumberKind()),
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Attributes: Iterator(labels.Iter()),
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StartTimeUnixNano: toNanos(record.StartTime()),
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TimeUnixNano: toNanos(record.EndTime()),
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Count: uint64(count),
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BucketCounts: counts,
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ExplicitBounds: boundaries,
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},
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},
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},
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},
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}
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return m, nil
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}
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