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package basictracer_test
import (
"bytes"
"net/http"
"reflect"
"testing"
"time"
"github.com/davecgh/go-spew/spew"
basictracer "github.com/opentracing/basictracer-go"
opentracing "github.com/opentracing/opentracing-go"
)
type verbatimCarrier struct {
basictracer.SpanContext
b map[string]string
}
var _ basictracer.DelegatingCarrier = &verbatimCarrier{}
func (vc *verbatimCarrier) SetBaggageItem(k, v string) {
vc.b[k] = v
}
func (vc *verbatimCarrier) GetBaggage(f func(string, string)) {
for k, v := range vc.b {
f(k, v)
}
}
func (vc *verbatimCarrier) SetState(tID, sID uint64, sampled bool) {
vc.SpanContext = basictracer.SpanContext{TraceID: tID, SpanID: sID, Sampled: sampled}
}
func (vc *verbatimCarrier) State() (traceID, spanID uint64, sampled bool) {
return vc.SpanContext.TraceID, vc.SpanContext.SpanID, vc.SpanContext.Sampled
}
func TestSpanPropagator(t *testing.T) {
const op = "test"
recorder := basictracer.NewInMemoryRecorder()
tracer := basictracer.New(recorder)
sp := tracer.StartSpan(op)
sp.SetBaggageItem("foo", "bar")
tmc := opentracing.HTTPHeadersCarrier(http.Header{})
tests := []struct {
typ, carrier interface{}
}{
{basictracer.Delegator, basictracer.DelegatingCarrier(&verbatimCarrier{b: map[string]string{}})},
{opentracing.Binary, &bytes.Buffer{}},
{opentracing.HTTPHeaders, tmc},
{opentracing.TextMap, tmc},
}
for i, test := range tests {
if err := tracer.Inject(sp.Context(), test.typ, test.carrier); err != nil {
t.Fatalf("%d: %v", i, err)
}
injectedContext, err := tracer.Extract(test.typ, test.carrier)
if err != nil {
t.Fatalf("%d: %v", i, err)
}
child := tracer.StartSpan(
op,
opentracing.ChildOf(injectedContext))
child.Finish()
}
sp.Finish()
spans := recorder.GetSpans()
if a, e := len(spans), len(tests)+1; a != e {
t.Fatalf("expected %d spans, got %d", e, a)
}
// The last span is the original one.
exp, spans := spans[len(spans)-1], spans[:len(spans)-1]
exp.Duration = time.Duration(123)
exp.Start = time.Time{}.Add(1)
for i, sp := range spans {
if a, e := sp.ParentSpanID, exp.Context.SpanID; a != e {
t.Fatalf("%d: ParentSpanID %d does not match expectation %d", i, a, e)
} else {
// Prepare for comparison.
sp.Context.SpanID, sp.ParentSpanID = exp.Context.SpanID, 0
sp.Duration, sp.Start = exp.Duration, exp.Start
}
if a, e := sp.Context.TraceID, exp.Context.TraceID; a != e {
t.Fatalf("%d: TraceID changed from %d to %d", i, e, a)
}
if !reflect.DeepEqual(exp, sp) {
t.Fatalf("%d: wanted %+v, got %+v", i, spew.Sdump(exp), spew.Sdump(sp))
}
}
}
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