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opentelemetry-go/exporters/stdout/trace.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 stdout
import (
"context"
"encoding/json"
"fmt"
"sync"
"go.opentelemetry.io/otel/sdk/export/trace"
)
// Exporter is an implementation of trace.SpanSyncer that writes spans to stdout.
type traceExporter struct {
config Config
stoppedMu sync.RWMutex
stopped bool
}
// ExportSpans writes SpanData in json format to stdout.
func (e *traceExporter) ExportSpans(ctx context.Context, data []*trace.SpanData) error {
e.stoppedMu.RLock()
stopped := e.stopped
e.stoppedMu.RUnlock()
if stopped {
return nil
}
if e.config.DisableTraceExport || len(data) == 0 {
return nil
}
out, err := e.marshal(data)
if err != nil {
return err
}
_, err = fmt.Fprintln(e.config.Writer, string(out))
return err
}
// Shutdown is called to stop the exporter, it preforms no action.
func (e *traceExporter) Shutdown(ctx context.Context) error {
e.stoppedMu.Lock()
e.stopped = true
e.stoppedMu.Unlock()
select {
case <-ctx.Done():
return ctx.Err()
default:
}
return nil
}
// marshal v with approriate indentation.
func (e *traceExporter) marshal(v interface{}) ([]byte, error) {
if e.config.PrettyPrint {
return json.MarshalIndent(v, "", "\t")
}
return json.Marshal(v)
}