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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 stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"context"
"encoding/json"
"fmt"
"strings"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric/sdkapi"
exportmetric "go.opentelemetry.io/otel/sdk/export/metric"
"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/resource"
)
type metricExporter struct {
config config
}
var _ exportmetric.Exporter = &metricExporter{}
type line struct {
Name string `json:"Name"`
Min interface{} `json:"Min,omitempty"`
Max interface{} `json:"Max,omitempty"`
Sum interface{} `json:"Sum,omitempty"`
Count interface{} `json:"Count,omitempty"`
LastValue interface{} `json:"Last,omitempty"`
// Note: this is a pointer because omitempty doesn't work when time.IsZero()
Timestamp *time.Time `json:"Timestamp,omitempty"`
}
func (e *metricExporter) TemporalityFor(desc *sdkapi.Descriptor, kind aggregation.Kind) aggregation.Temporality {
return aggregation.StatelessTemporalitySelector().TemporalityFor(desc, kind)
}
func (e *metricExporter) Export(_ context.Context, res *resource.Resource, reader exportmetric.InstrumentationLibraryReader) error {
var aggError error
var batch []line
aggError = reader.ForEach(func(lib instrumentation.Library, mr exportmetric.Reader) error {
var instLabels []attribute.KeyValue
if name := lib.Name; name != "" {
instLabels = append(instLabels, attribute.String("instrumentation.name", name))
if version := lib.Version; version != "" {
instLabels = append(instLabels, attribute.String("instrumentation.version", version))
}
if schema := lib.SchemaURL; schema != "" {
instLabels = append(instLabels, attribute.String("instrumentation.schema_url", schema))
}
}
instSet := attribute.NewSet(instLabels...)
encodedInstLabels := instSet.Encoded(e.config.LabelEncoder)
return mr.ForEach(e, func(record exportmetric.Record) error {
desc := record.Descriptor()
agg := record.Aggregation()
kind := desc.NumberKind()
encodedResource := res.Encoded(e.config.LabelEncoder)
var expose line
if sum, ok := agg.(aggregation.Sum); ok {
value, err := sum.Sum()
if err != nil {
return err
}
expose.Sum = value.AsInterface(kind)
}
if mmsc, ok := agg.(aggregation.MinMaxSumCount); ok {
count, err := mmsc.Count()
if err != nil {
return err
}
expose.Count = count
max, err := mmsc.Max()
if err != nil {
return err
}
expose.Max = max.AsInterface(kind)
min, err := mmsc.Min()
if err != nil {
return err
}
expose.Min = min.AsInterface(kind)
} else if lv, ok := agg.(aggregation.LastValue); ok {
value, timestamp, err := lv.LastValue()
if err != nil {
return err
}
expose.LastValue = value.AsInterface(kind)
if e.config.Timestamps {
expose.Timestamp = ×tamp
}
}
var encodedLabels string
iter := record.Labels().Iter()
if iter.Len() > 0 {
encodedLabels = record.Labels().Encoded(e.config.LabelEncoder)
}
var sb strings.Builder
sb.WriteString(desc.Name())
if len(encodedLabels) > 0 || len(encodedResource) > 0 || len(encodedInstLabels) > 0 {
sb.WriteRune('{')
sb.WriteString(encodedResource)
if len(encodedInstLabels) > 0 && len(encodedResource) > 0 {
sb.WriteRune(',')
}
sb.WriteString(encodedInstLabels)
if len(encodedLabels) > 0 && (len(encodedInstLabels) > 0 || len(encodedResource) > 0) {
sb.WriteRune(',')
}
sb.WriteString(encodedLabels)
sb.WriteRune('}')
}
expose.Name = sb.String()
batch = append(batch, expose)
return nil
})
})
if len(batch) == 0 {
return aggError
}
data, err := e.marshal(batch)
if err != nil {
return err
}
fmt.Fprintln(e.config.Writer, string(data))
return aggError
}
// marshal v with appropriate indentation.
func (e *metricExporter) marshal(v interface{}) ([]byte, error) {
if e.config.PrettyPrint {
return json.MarshalIndent(v, "", "\t")
}
return json.Marshal(v)
}
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