Solve panic due to concurrent access to ExportSpans

Signed-off-by: Gahl Saraf <saraf.gahl@gmail.com>

util/tracing/detect/detect.go

@@ -84,6 +84,10 @@ func detect() error {
 		return nil
 	}
 
+	exp = &threadSafeExporter{
+		exporter: exp,
+	}
+
 	// enable log with traceID when valid exporter
 	bklog.EnableLogWithTraceID(true)
 

util/tracing/detect/threadsafe.go

@@ -0,0 +1,25 @@
+package detect
+
+import (
+	"context"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"sync"
+)
+
+// The SpanExporter is expected to be called from a synchronous context, and if called from different routines can panic.
+type threadSafeExporter struct {
+	mut      sync.Mutex
+	exporter sdktrace.SpanExporter
+}
+
+func (tse *threadSafeExporter) ExportSpans(ctx context.Context, spans []sdktrace.ReadOnlySpan) error {
+	tse.mut.Lock()
+	defer tse.mut.Unlock()
+	return tse.exporter.ExportSpans(ctx, spans)
+}
+
+func (tse *threadSafeExporter) Shutdown(ctx context.Context) error {
+	tse.mut.Lock()
+	defer tse.mut.Unlock()
+	return tse.exporter.Shutdown(ctx)
+}