forked from open-telemetry/opentelemetry-go
/
exporter.go
197 lines (174 loc) · 5.95 KB
/
exporter.go
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// 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 metrictest // import "go.opentelemetry.io/otel/sdk/metric/metrictest"
import (
"context"
"fmt"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/instrument"
"go.opentelemetry.io/otel/sdk/instrumentation"
controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
"go.opentelemetry.io/otel/sdk/metric/export"
"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
"go.opentelemetry.io/otel/sdk/metric/number"
processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
"go.opentelemetry.io/otel/sdk/metric/sdkapi"
selector "go.opentelemetry.io/otel/sdk/metric/selector/simple"
)
// Exporter is a manually collected exporter for testing the SDK. It does not
// satisfy the `export.Exporter` interface because it is not intended to be
// used with the periodic collection of the SDK, instead the test should
// manually call `Collect()`
//
// Exporters are not thread safe, and should only be used for testing.
type Exporter struct {
// Records contains the last metrics collected.
Records []ExportRecord
controller *controller.Controller
temporalitySelector aggregation.TemporalitySelector
}
// NewTestMeterProvider creates a MeterProvider and Exporter to be used in tests.
func NewTestMeterProvider(opts ...Option) (metric.MeterProvider, *Exporter) {
cfg := newConfig(opts...)
c := controller.New(
processor.NewFactory(
selector.NewWithHistogramDistribution(),
cfg.temporalitySelector,
),
controller.WithCollectPeriod(0),
)
exp := &Exporter{
controller: c,
temporalitySelector: cfg.temporalitySelector,
}
return c, exp
}
// Library is the same as "sdk/instrumentation".Library but there is
// a package cycle to use it so it is redeclared here.
type Library struct {
InstrumentationName string
InstrumentationVersion string
SchemaURL string
}
// ExportRecord represents one collected datapoint from the Exporter.
type ExportRecord struct {
InstrumentName string
InstrumentationLibrary Library
Attributes []attribute.KeyValue
AggregationKind aggregation.Kind
NumberKind number.Kind
Sum number.Number
Count uint64
Histogram aggregation.Buckets
LastValue number.Number
}
// Collect triggers the SDK's collect methods and then aggregates the data into
// ExportRecords. This will overwrite any previous collected metrics.
func (e *Exporter) Collect(ctx context.Context) error {
e.Records = []ExportRecord{}
err := e.controller.Collect(ctx)
if err != nil {
return err
}
return e.controller.ForEach(func(l instrumentation.Library, r export.Reader) error {
lib := Library{
InstrumentationName: l.Name,
InstrumentationVersion: l.Version,
SchemaURL: l.SchemaURL,
}
return r.ForEach(e.temporalitySelector, func(rec export.Record) error {
record := ExportRecord{
InstrumentName: rec.Descriptor().Name(),
InstrumentationLibrary: lib,
Attributes: rec.Attributes().ToSlice(),
AggregationKind: rec.Aggregation().Kind(),
NumberKind: rec.Descriptor().NumberKind(),
}
var err error
switch agg := rec.Aggregation().(type) {
case aggregation.Histogram:
record.AggregationKind = aggregation.HistogramKind
record.Histogram, err = agg.Histogram()
if err != nil {
return err
}
record.Sum, err = agg.Sum()
if err != nil {
return err
}
record.Count, err = agg.Count()
if err != nil {
return err
}
case aggregation.Count:
record.Count, err = agg.Count()
if err != nil {
return err
}
case aggregation.LastValue:
record.LastValue, _, err = agg.LastValue()
if err != nil {
return err
}
case aggregation.Sum:
record.Sum, err = agg.Sum()
if err != nil {
return err
}
}
e.Records = append(e.Records, record)
return nil
})
})
}
// GetRecords returns all Records found by the SDK.
func (e *Exporter) GetRecords() []ExportRecord {
return e.Records
}
var errNotFound = fmt.Errorf("record not found")
// GetByName returns the first Record with a matching instrument name.
func (e *Exporter) GetByName(name string) (ExportRecord, error) {
for _, rec := range e.Records {
if rec.InstrumentName == name {
return rec, nil
}
}
return ExportRecord{}, errNotFound
}
// GetByNameAndAttributes returns the first Record with a matching name and the sub-set of attributes.
func (e *Exporter) GetByNameAndAttributes(name string, attributes []attribute.KeyValue) (ExportRecord, error) {
for _, rec := range e.Records {
if rec.InstrumentName == name && subSet(attributes, rec.Attributes) {
return rec, nil
}
}
return ExportRecord{}, errNotFound
}
// subSet returns true if attributesA is a subset of attributesB.
func subSet(attributesA, attributesB []attribute.KeyValue) bool {
b := attribute.NewSet(attributesB...)
for _, kv := range attributesA {
if v, found := b.Value(kv.Key); !found || v != kv.Value {
return false
}
}
return true
}
// NewDescriptor is a test helper for constructing test metric
// descriptors using standard options.
func NewDescriptor(name string, ikind sdkapi.InstrumentKind, nkind number.Kind, opts ...instrument.Option) sdkapi.Descriptor {
cfg := instrument.NewConfig(opts...)
return sdkapi.NewDescriptor(name, ikind, nkind, cfg.Description(), cfg.Unit())
}