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package opentracing_test
import (
"context"
"net/http"
"reflect"
"testing"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/mocktracer"
kitot "github.com/go-kit/kit/tracing/opentracing"
"github.com/go-kit/log"
)
func TestTraceHTTPRequestRoundtrip(t *testing.T) {
logger := log.NewNopLogger()
tracer := mocktracer.New()
// Initialize the ctx with a Span to inject.
beforeSpan := tracer.StartSpan("to_inject").(*mocktracer.MockSpan)
defer beforeSpan.Finish()
beforeSpan.SetBaggageItem("baggage", "check")
beforeCtx := opentracing.ContextWithSpan(context.Background(), beforeSpan)
toHTTPFunc := kitot.ContextToHTTP(tracer, logger)
req, _ := http.NewRequest("GET", "http://test.biz/path", nil)
// Call the RequestFunc.
afterCtx := toHTTPFunc(beforeCtx, req)
// The Span should not have changed.
afterSpan := opentracing.SpanFromContext(afterCtx)
if beforeSpan != afterSpan {
t.Error("Should not swap in a new span")
}
// No spans should have finished yet.
finishedSpans := tracer.FinishedSpans()
if want, have := 0, len(finishedSpans); want != have {
t.Errorf("Want %v span(s), found %v", want, have)
}
// Use HTTPToContext to verify that we can join with the trace given a req.
fromHTTPFunc := kitot.HTTPToContext(tracer, "joined", logger)
joinCtx := fromHTTPFunc(afterCtx, req)
joinedSpan := opentracing.SpanFromContext(joinCtx).(*mocktracer.MockSpan)
joinedContext := joinedSpan.Context().(mocktracer.MockSpanContext)
beforeContext := beforeSpan.Context().(mocktracer.MockSpanContext)
if joinedContext.SpanID == beforeContext.SpanID {
t.Error("SpanID should have changed", joinedContext.SpanID, beforeContext.SpanID)
}
// Check that the parent/child relationship is as expected for the joined span.
if want, have := beforeContext.SpanID, joinedSpan.ParentID; want != have {
t.Errorf("Want ParentID %q, have %q", want, have)
}
if want, have := "joined", joinedSpan.OperationName; want != have {
t.Errorf("Want %q, have %q", want, have)
}
if want, have := "check", joinedSpan.BaggageItem("baggage"); want != have {
t.Errorf("Want %q, have %q", want, have)
}
}
func TestContextToHTTPTags(t *testing.T) {
tracer := mocktracer.New()
span := tracer.StartSpan("to_inject").(*mocktracer.MockSpan)
defer span.Finish()
ctx := opentracing.ContextWithSpan(context.Background(), span)
req, _ := http.NewRequest("GET", "http://test.biz/path", nil)
kitot.ContextToHTTP(tracer, log.NewNopLogger())(ctx, req)
expectedTags := map[string]interface{}{
string(ext.HTTPMethod): "GET",
string(ext.HTTPUrl): "http://test.biz/path",
string(ext.PeerHostname): "test.biz",
}
if !reflect.DeepEqual(expectedTags, span.Tags()) {
t.Errorf("Want %q, have %q", expectedTags, span.Tags())
}
}
func TestHTTPToContextTags(t *testing.T) {
tracer := mocktracer.New()
parentSpan := tracer.StartSpan("to_extract").(*mocktracer.MockSpan)
defer parentSpan.Finish()
req, _ := http.NewRequest("GET", "http://test.biz/path", nil)
tracer.Inject(parentSpan.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header))
ctx := kitot.HTTPToContext(tracer, "op", log.NewNopLogger())(context.Background(), req)
opentracing.SpanFromContext(ctx).Finish()
childSpan := tracer.FinishedSpans()[0]
expectedTags := map[string]interface{}{
string(ext.HTTPMethod): "GET",
string(ext.HTTPUrl): "http://test.biz/path",
string(ext.SpanKind): ext.SpanKindRPCServerEnum,
}
if !reflect.DeepEqual(expectedTags, childSpan.Tags()) {
t.Errorf("Want %q, have %q", expectedTags, childSpan.Tags())
}
if want, have := "op", childSpan.OperationName; want != have {
t.Errorf("Want %q, have %q", want, have)
}
}
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