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fix: lock accesses to encoder in json stdout exporter to prevent crash #2265

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Sep 30, 2021
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3 changes: 3 additions & 0 deletions exporters/stdout/stdouttrace/trace.go
Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ func New(options ...Option) (*Exporter, error) {
// Exporter is an implementation of trace.SpanSyncer that writes spans to stdout.
type Exporter struct {
encoder *json.Encoder
encoderMu sync.Mutex
timestamps bool

stoppedMu sync.RWMutex
Expand Down Expand Up @@ -83,6 +84,8 @@ func (e *Exporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan)
}

// Encode span stubs, one by one
e.encoderMu.Lock()
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defer e.encoderMu.Unlock()
if err := e.encoder.Encode(stub); err != nil {
return err
}
Expand Down