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|
package opencensus_test
import (
"context"
"errors"
"net/http"
"net/http/httptest"
"net/url"
"testing"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/plugin/ochttp/propagation/b3"
"go.opencensus.io/plugin/ochttp/propagation/tracecontext"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
"github.com/go-kit/kit/endpoint"
ockit "github.com/go-kit/kit/tracing/opencensus"
kithttp "github.com/go-kit/kit/transport/http"
)
func TestHTTPClientTrace(t *testing.T) {
var (
err error
rec = &recordingExporter{}
rURL, _ = url.Parse("https://httpbin.org/get")
)
trace.RegisterExporter(rec)
traces := []struct {
name string
err error
}{
{"", nil},
{"CustomName", nil},
{"", errors.New("dummy-error")},
}
for _, tr := range traces {
clientTracer := ockit.HTTPClientTrace(
ockit.WithName(tr.name),
ockit.WithSampler(trace.AlwaysSample()),
)
ep := kithttp.NewClient(
"GET",
rURL,
func(ctx context.Context, r *http.Request, i interface{}) error {
return nil
},
func(ctx context.Context, r *http.Response) (response interface{}, err error) {
return nil, tr.err
},
clientTracer,
).Endpoint()
ctx, parentSpan := trace.StartSpan(context.Background(), "test")
_, err = ep(ctx, nil)
if want, have := tr.err, err; want != have {
t.Fatalf("unexpected error, want %s, have %s", tr.err.Error(), err.Error())
}
spans := rec.Flush()
if want, have := 1, len(spans); want != have {
t.Fatalf("incorrect number of spans, want %d, have %d", want, have)
}
span := spans[0]
if want, have := parentSpan.SpanContext().SpanID, span.ParentSpanID; want != have {
t.Errorf("incorrect parent ID, want %s, have %s", want, have)
}
if want, have := tr.name, span.Name; want != have && want != "" {
t.Errorf("incorrect span name, want %s, have %s", want, have)
}
if want, have := "GET /get", span.Name; want != have && tr.name == "" {
t.Errorf("incorrect span name, want %s, have %s", want, have)
}
code := trace.StatusCodeOK
if tr.err != nil {
code = trace.StatusCodeUnknown
if want, have := err.Error(), span.Status.Message; want != have {
t.Errorf("incorrect span status msg, want %s, have %s", want, have)
}
}
if want, have := int32(code), span.Status.Code; want != have {
t.Errorf("incorrect span status code, want %d, have %d", want, have)
}
}
}
func TestHTTPServerTrace(t *testing.T) {
rec := &recordingExporter{}
trace.RegisterExporter(rec)
traces := []struct {
useParent bool
name string
err error
propagation propagation.HTTPFormat
}{
{false, "", nil, nil},
{true, "", nil, nil},
{true, "CustomName", nil, &b3.HTTPFormat{}},
{true, "", errors.New("dummy-error"), &tracecontext.HTTPFormat{}},
}
for _, tr := range traces {
var client http.Client
handler := kithttp.NewServer(
endpoint.Nop,
func(context.Context, *http.Request) (interface{}, error) { return nil, nil },
func(context.Context, http.ResponseWriter, interface{}) error { return errors.New("dummy") },
ockit.HTTPServerTrace(
ockit.WithName(tr.name),
ockit.WithSampler(trace.AlwaysSample()),
ockit.WithHTTPPropagation(tr.propagation),
),
)
server := httptest.NewServer(handler)
defer server.Close()
const httpMethod = "GET"
req, err := http.NewRequest(httpMethod, server.URL, nil)
if err != nil {
t.Fatalf("unable to create HTTP request: %s", err.Error())
}
if tr.useParent {
client = http.Client{
Transport: &ochttp.Transport{
StartOptions: trace.StartOptions{
Sampler: trace.AlwaysSample(),
},
Propagation: tr.propagation,
},
}
}
resp, err := client.Do(req.WithContext(context.Background()))
if err != nil {
t.Fatalf("unable to send HTTP request: %s", err.Error())
}
resp.Body.Close()
spans := rec.Flush()
expectedSpans := 1
if tr.useParent {
expectedSpans++
}
if want, have := expectedSpans, len(spans); want != have {
t.Fatalf("incorrect number of spans, want %d, have %d", want, have)
}
if tr.useParent {
if want, have := spans[1].TraceID, spans[0].TraceID; want != have {
t.Errorf("incorrect trace ID, want %s, have %s", want, have)
}
if want, have := spans[1].SpanID, spans[0].ParentSpanID; want != have {
t.Errorf("incorrect span ID, want %s, have %s", want, have)
}
}
if want, have := tr.name, spans[0].Name; want != have && want != "" {
t.Errorf("incorrect span name, want %s, have %s", want, have)
}
if want, have := "GET /", spans[0].Name; want != have && tr.name == "" {
t.Errorf("incorrect span name, want %s, have %s", want, have)
}
}
}
|
