initial import

core/trace/tracespec/spancontext.go

@@ -0,0 +1,7 @@
+package tracespec
+
+type SpanContext interface {
+	TraceId() string
+	SpanId() string
+	Visit(fn func(key, val string) bool)
+}

core/trace/tracespec/trace.go

@@ -0,0 +1,10 @@
+package tracespec
+
+import "context"
+
+type Trace interface {
+	SpanContext
+	Finish()
+	Fork(ctx context.Context, serviceName, operationName string) (context.Context, Trace)
+	Follow(ctx context.Context, serviceName, operationName string) (context.Context, Trace)
+}

core/trace/tracespec/vars.go

@@ -0,0 +1,3 @@
+package tracespec
+
+const TracingKey = "X-Trace"