2020-07-22 21:34:44 +02:00
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// 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 stdout
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import (
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"context"
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"encoding/json"
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"fmt"
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2020-09-09 19:19:03 +02:00
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"sync"
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2020-07-22 21:34:44 +02:00
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"go.opentelemetry.io/otel/sdk/export/trace"
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)
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// Exporter is an implementation of trace.SpanSyncer that writes spans to stdout.
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type traceExporter struct {
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config Config
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2020-09-09 19:19:03 +02:00
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stoppedMu sync.RWMutex
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stopped bool
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2020-07-22 21:34:44 +02:00
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}
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// ExportSpans writes SpanData in json format to stdout.
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2020-09-09 19:19:03 +02:00
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func (e *traceExporter) ExportSpans(ctx context.Context, data []*trace.SpanData) error {
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e.stoppedMu.RLock()
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stopped := e.stopped
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e.stoppedMu.RUnlock()
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if stopped {
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return nil
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}
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2020-07-22 21:34:44 +02:00
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if e.config.DisableTraceExport || len(data) == 0 {
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return nil
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}
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out, err := e.marshal(data)
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if err != nil {
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return err
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}
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_, err = fmt.Fprintln(e.config.Writer, string(out))
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return err
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}
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// Shutdown is called to stop the exporter, it preforms no action.
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func (e *traceExporter) Shutdown(ctx context.Context) error {
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e.stoppedMu.Lock()
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e.stopped = true
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e.stoppedMu.Unlock()
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2020-07-22 21:34:44 +02:00
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2020-09-09 19:19:03 +02:00
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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2020-07-22 21:34:44 +02:00
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}
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return nil
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2020-07-22 21:34:44 +02:00
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}
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// marshal v with approriate indentation.
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func (e *traceExporter) marshal(v interface{}) ([]byte, error) {
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if e.config.PrettyPrint {
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return json.MarshalIndent(v, "", "\t")
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}
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return json.Marshal(v)
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}
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