Move SpanLink struct to separate span_link.go file so msgp genera…

…tion works properly

ddtrace/ddtrace.go

@@ -103,25 +103,6 @@ type SpanContext interface {
 	ForeachBaggageItem(handler func(k, v string) bool)
 }
 
-// SpanLink represents a reference to a span that exists outside of the trace.
-//
-//go:generate msgp -unexported -marshal=false -o=span_link_msgp.go -tests=false
-
-type SpanLink struct {
-	// TraceID represents the low 64 bits of the linked span's trace id. This field is required.
-	TraceID uint64 `msg:"trace_id" json:"trace_id"`
-	// TraceIDHigh represents the high 64 bits of the linked span's trace id. This field is only set if the linked span's trace id is 128 bits.
-	TraceIDHigh uint64 `msg:"trace_id_high,omitempty" json:"trace_id_high"`
-	// SpanID represents the linked span's span id.
-	SpanID uint64 `msg:"span_id" json:"span_id"`
-	// Attributes is a mapping of keys to string values. These values are used to add additional context to the span link.
-	Attributes map[string]string `msg:"attributes,omitempty" json:"attributes"`
-	// Tracestate is the tracestate of the linked span. This field is optional.
-	Tracestate string `msg:"tracestate,omitempty" json:"tracestate"`
-	// Flags represents the W3C trace flags of the linked span. This field is optional.
-	Flags uint32 `msg:"flags,omitempty" json:"flags"`
-}
-
 // StartSpanOption is a configuration option that can be used with a Tracer's StartSpan method.
 type StartSpanOption func(cfg *StartSpanConfig)
 

ddtrace/span_link.go

@@ -0,0 +1,25 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2016 Datadog, Inc.
+
+package ddtrace
+
+// SpanLink represents a reference to a span that exists outside of the trace.
+//
+//go:generate msgp -unexported -marshal=false -o=span_link_msgp.go -tests=false
+
+type SpanLink struct {
+	// TraceID represents the low 64 bits of the linked span's trace id. This field is required.
+	TraceID uint64 `msg:"trace_id" json:"trace_id"`
+	// TraceIDHigh represents the high 64 bits of the linked span's trace id. This field is only set if the linked span's trace id is 128 bits.
+	TraceIDHigh uint64 `msg:"trace_id_high,omitempty" json:"trace_id_high"`
+	// SpanID represents the linked span's span id.
+	SpanID uint64 `msg:"span_id" json:"span_id"`
+	// Attributes is a mapping of keys to string values. These values are used to add additional context to the span link.
+	Attributes map[string]string `msg:"attributes,omitempty" json:"attributes"`
+	// Tracestate is the tracestate of the linked span. This field is optional.
+	Tracestate string `msg:"tracestate,omitempty" json:"tracestate"`
+	// Flags represents the W3C trace flags of the linked span. This field is optional.
+	Flags uint32 `msg:"flags,omitempty" json:"flags"`
+}