Opentracing support

vendor/github.com/openzipkin/zipkin-go-opentracing/recorder.go

@@ -0,0 +1,60 @@
+package zipkintracer
+
+import "sync"
+
+// A SpanRecorder handles all of the `RawSpan` data generated via an
+// associated `Tracer` (see `NewStandardTracer`) instance. It also names
+// the containing process and provides access to a straightforward tag map.
+type SpanRecorder interface {
+	// Implementations must determine whether and where to store `span`.
+	RecordSpan(span RawSpan)
+}
+
+// InMemorySpanRecorder is a simple thread-safe implementation of
+// SpanRecorder that stores all reported spans in memory, accessible
+// via reporter.GetSpans(). It is primarily intended for testing purposes.
+type InMemorySpanRecorder struct {
+	sync.RWMutex
+	spans []RawSpan
+}
+
+// NewInMemoryRecorder creates new InMemorySpanRecorder
+func NewInMemoryRecorder() *InMemorySpanRecorder {
+	return new(InMemorySpanRecorder)
+}
+
+// RecordSpan implements the respective method of SpanRecorder.
+func (r *InMemorySpanRecorder) RecordSpan(span RawSpan) {
+	r.Lock()
+	defer r.Unlock()
+	r.spans = append(r.spans, span)
+}
+
+// GetSpans returns a copy of the array of spans accumulated so far.
+func (r *InMemorySpanRecorder) GetSpans() []RawSpan {
+	r.RLock()
+	defer r.RUnlock()
+	spans := make([]RawSpan, len(r.spans))
+	copy(spans, r.spans)
+	return spans
+}
+
+// GetSampledSpans returns a slice of spans accumulated so far which were sampled.
+func (r *InMemorySpanRecorder) GetSampledSpans() []RawSpan {
+	r.RLock()
+	defer r.RUnlock()
+	spans := make([]RawSpan, 0, len(r.spans))
+	for _, span := range r.spans {
+		if span.Context.Sampled {
+			spans = append(spans, span)
+		}
+	}
+	return spans
+}
+
+// Reset clears the internal array of spans.
+func (r *InMemorySpanRecorder) Reset() {
+	r.Lock()
+	defer r.Unlock()
+	r.spans = nil
+}