initial import

core/trace/noop.go

@@ -0,0 +1,33 @@
+package trace
+
+import (
+	"context"
+
+	"zero/core/trace/tracespec"
+)
+
+var emptyNoopSpan = noopSpan{}
+
+type noopSpan struct{}
+
+func (s noopSpan) Finish() {
+}
+
+func (s noopSpan) Follow(ctx context.Context, serviceName, operationName string) (context.Context, tracespec.Trace) {
+	return ctx, emptyNoopSpan
+}
+
+func (s noopSpan) Fork(ctx context.Context, serviceName, operationName string) (context.Context, tracespec.Trace) {
+	return ctx, emptyNoopSpan
+}
+
+func (s noopSpan) SpanId() string {
+	return ""
+}
+
+func (s noopSpan) TraceId() string {
+	return ""
+}
+
+func (s noopSpan) Visit(fn func(key, val string) bool) {
+}