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package opencensus_test
import (
"context"
"errors"
"testing"
"time"
"go.opencensus.io/trace"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/sd"
"github.com/go-kit/kit/sd/lb"
"github.com/go-kit/kit/tracing/opencensus"
)
const (
span1 = ""
span2 = "SPAN-2"
span3 = "SPAN-3"
span4 = "SPAN-4"
span5 = "SPAN-5"
span6 = "SPAN-6"
)
var (
err1 = errors.New("some error")
err2 = errors.New("other error")
err3 = errors.New("some business error")
err4 = errors.New("other business error")
)
// compile time assertion
var _ endpoint.Failer = failedResponse{}
type failedResponse struct {
err error
}
func (r failedResponse) Failed() error { return r.err }
func passEndpoint(_ context.Context, req interface{}) (interface{}, error) {
if err, _ := req.(error); err != nil {
return nil, err
}
return req, nil
}
func TestTraceEndpoint(t *testing.T) {
ctx := context.Background()
e := &recordingExporter{}
trace.RegisterExporter(e)
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
// span 1
span1Attrs := []trace.Attribute{
trace.StringAttribute("string", "value"),
trace.Int64Attribute("int64", 42),
}
mw := opencensus.TraceEndpoint(
span1, opencensus.WithEndpointAttributes(span1Attrs...),
)
mw(endpoint.Nop)(ctx, nil)
// span 2
opts := opencensus.EndpointOptions{}
mw = opencensus.TraceEndpoint(span2, opencensus.WithEndpointConfig(opts))
mw(passEndpoint)(ctx, err1)
// span3
mw = opencensus.TraceEndpoint(span3)
ep := lb.Retry(5, 1*time.Second, lb.NewRoundRobin(sd.FixedEndpointer{passEndpoint}))
mw(ep)(ctx, err2)
// span4
mw = opencensus.TraceEndpoint(span4)
mw(passEndpoint)(ctx, failedResponse{err: err3})
// span5
mw = opencensus.TraceEndpoint(span5, opencensus.WithIgnoreBusinessError(true))
mw(passEndpoint)(ctx, failedResponse{err: err4})
// span6
span6Attrs := []trace.Attribute{
trace.StringAttribute("string", "value"),
trace.Int64Attribute("int64", 42),
}
mw = opencensus.TraceEndpoint(
"",
opencensus.WithSpanName(func(ctx context.Context, name string) string {
return span6
}),
opencensus.WithSpanAttributes(func(ctx context.Context) []trace.Attribute {
return span6Attrs
}),
)
mw(endpoint.Nop)(ctx, nil)
// check span count
spans := e.Flush()
if want, have := 6, len(spans); want != have {
t.Fatalf("incorrected number of spans, wanted %d, got %d", want, have)
}
// test span 1
span := spans[0]
if want, have := int32(trace.StatusCodeOK), span.Code; want != have {
t.Errorf("incorrect status code, wanted %d, got %d", want, have)
}
if want, have := opencensus.TraceEndpointDefaultName, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 2, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
// test span 2
span = spans[1]
if want, have := int32(trace.StatusCodeUnknown), span.Code; want != have {
t.Errorf("incorrect status code, wanted %d, got %d", want, have)
}
if want, have := span2, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 0, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
// test span 3
span = spans[2]
if want, have := int32(trace.StatusCodeUnknown), span.Code; want != have {
t.Errorf("incorrect status code, wanted %d, got %d", want, have)
}
if want, have := span3, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 5, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
// test span 4
span = spans[3]
if want, have := int32(trace.StatusCodeUnknown), span.Code; want != have {
t.Errorf("incorrect status code, wanted %d, got %d", want, have)
}
if want, have := span4, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 1, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
// test span 5
span = spans[4]
if want, have := int32(trace.StatusCodeOK), span.Code; want != have {
t.Errorf("incorrect status code, wanted %d, got %d", want, have)
}
if want, have := span5, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 1, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
// test span 6
span = spans[5]
if want, have := span6, span.Name; want != have {
t.Errorf("incorrect span name, wanted %q, got %q", want, have)
}
if want, have := 2, len(span.Attributes); want != have {
t.Fatalf("incorrect attribute count, wanted %d, got %d", want, have)
}
}
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