mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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66fccc0be0
* lock accesses to encoder fixes #2264 * move locking outside loop to avoid deadlock * Update CHANGELOG.md
109 lines
2.4 KiB
Go
109 lines
2.4 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 stdouttrace // import "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
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import (
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"context"
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"encoding/json"
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"sync"
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"time"
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"go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/sdk/trace/tracetest"
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)
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var zeroTime time.Time
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var _ trace.SpanExporter = &Exporter{}
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// New creates an Exporter with the passed options.
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func New(options ...Option) (*Exporter, error) {
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cfg, err := newConfig(options...)
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if err != nil {
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return nil, err
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}
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enc := json.NewEncoder(cfg.Writer)
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if cfg.PrettyPrint {
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enc.SetIndent("", "\t")
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}
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return &Exporter{
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encoder: enc,
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timestamps: cfg.Timestamps,
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}, nil
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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 Exporter struct {
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encoder *json.Encoder
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encoderMu sync.Mutex
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timestamps bool
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stoppedMu sync.RWMutex
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stopped bool
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}
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// ExportSpans writes spans in json format to stdout.
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func (e *Exporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan) 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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if len(spans) == 0 {
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return nil
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}
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stubs := tracetest.SpanStubsFromReadOnlySpans(spans)
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e.encoderMu.Lock()
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defer e.encoderMu.Unlock()
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for i := range stubs {
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stub := &stubs[i]
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// Remove timestamps
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if !e.timestamps {
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stub.StartTime = zeroTime
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stub.EndTime = zeroTime
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for j := range stub.Events {
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ev := &stub.Events[j]
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ev.Time = zeroTime
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}
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}
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// Encode span stubs, one by one
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if err := e.encoder.Encode(stub); err != nil {
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return err
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}
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}
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return nil
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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 *Exporter) 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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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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return nil
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}
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