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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package test
import (
"context"
"fmt"
"net/http"
"net/http/httptest"
"testing"
"github.com/gorilla/mux"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/sdk/trace/tracetest"
"go.opentelemetry.io/otel/trace"
)
func TestCustomSpanNameFormatter(t *testing.T) {
exporter := tracetest.NewInMemoryExporter()
tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter))
routeTpl := "/user/{id}"
testdata := []struct {
spanNameFormatter func(string, *http.Request) string
expected string
}{
{nil, routeTpl},
{
func(string, *http.Request) string { return "custom" },
"custom",
},
{
func(name string, r *http.Request) string {
return fmt.Sprintf("%s %s", r.Method, name)
},
"GET " + routeTpl,
},
}
for i, d := range testdata {
t.Run(fmt.Sprintf("%d_%s", i, d.expected), func(t *testing.T) {
router := mux.NewRouter()
router.Use(otelmux.Middleware(
"foobar",
otelmux.WithTracerProvider(tp),
otelmux.WithSpanNameFormatter(d.spanNameFormatter),
))
router.HandleFunc(routeTpl, func(w http.ResponseWriter, r *http.Request) {})
r := httptest.NewRequest("GET", "/user/123", nil)
w := httptest.NewRecorder()
router.ServeHTTP(w, r)
spans := exporter.GetSpans()
require.Len(t, spans, 1)
assert.Equal(t, d.expected, spans[0].Name)
exporter.Reset()
})
}
}
func ok(w http.ResponseWriter, _ *http.Request) {}
func notfound(w http.ResponseWriter, _ *http.Request) {
http.Error(w, "not found", http.StatusNotFound)
}
func TestSDKIntegration(t *testing.T) {
sr := tracetest.NewSpanRecorder()
provider := sdktrace.NewTracerProvider()
provider.RegisterSpanProcessor(sr)
router := mux.NewRouter()
router.Use(otelmux.Middleware("foobar", otelmux.WithTracerProvider(provider)))
router.HandleFunc("/user/{id:[0-9]+}", ok)
router.HandleFunc("/book/{title}", ok)
r0 := httptest.NewRequest("GET", "/user/123", nil)
r1 := httptest.NewRequest("GET", "/book/foo", nil)
w := httptest.NewRecorder()
router.ServeHTTP(w, r0)
router.ServeHTTP(w, r1)
require.Len(t, sr.Ended(), 2)
assertSpan(t, sr.Ended()[0],
"/user/{id:[0-9]+}",
trace.SpanKindServer,
attribute.String("net.host.name", "foobar"),
attribute.Int("http.status_code", http.StatusOK),
attribute.String("http.method", "GET"),
attribute.String("http.route", "/user/{id:[0-9]+}"),
)
assertSpan(t, sr.Ended()[1],
"/book/{title}",
trace.SpanKindServer,
attribute.String("net.host.name", "foobar"),
attribute.Int("http.status_code", http.StatusOK),
attribute.String("http.method", "GET"),
attribute.String("http.route", "/book/{title}"),
)
}
func TestNotFoundIsNotError(t *testing.T) {
sr := tracetest.NewSpanRecorder()
provider := sdktrace.NewTracerProvider()
provider.RegisterSpanProcessor(sr)
router := mux.NewRouter()
router.Use(otelmux.Middleware("foobar", otelmux.WithTracerProvider(provider)))
router.HandleFunc("/does/not/exist", notfound)
r0 := httptest.NewRequest("GET", "/does/not/exist", nil)
w := httptest.NewRecorder()
router.ServeHTTP(w, r0)
require.Len(t, sr.Ended(), 1)
assertSpan(t, sr.Ended()[0],
"/does/not/exist",
trace.SpanKindServer,
attribute.String("net.host.name", "foobar"),
attribute.Int("http.status_code", http.StatusNotFound),
attribute.String("http.method", "GET"),
attribute.String("http.route", "/does/not/exist"),
)
assert.Equal(t, codes.Unset, sr.Ended()[0].Status().Code)
}
func assertSpan(t *testing.T, span sdktrace.ReadOnlySpan, name string, kind trace.SpanKind, attrs ...attribute.KeyValue) {
assert.Equal(t, name, span.Name())
assert.Equal(t, kind, span.SpanKind())
got := make(map[attribute.Key]attribute.Value, len(span.Attributes()))
for _, a := range span.Attributes() {
got[a.Key] = a.Value
}
for _, want := range attrs {
if !assert.Contains(t, got, want.Key) {
continue
}
assert.Equal(t, want.Value, got[want.Key])
}
}
func TestWithPublicEndpoint(t *testing.T) {
sr := tracetest.NewSpanRecorder()
provider := sdktrace.NewTracerProvider()
provider.RegisterSpanProcessor(sr)
remoteSpan := trace.SpanContextConfig{
TraceID: trace.TraceID{0x01},
SpanID: trace.SpanID{0x01},
Remote: true,
}
prop := propagation.TraceContext{}
router := mux.NewRouter()
router.Use(otelmux.Middleware("foobar",
otelmux.WithPublicEndpoint(),
otelmux.WithPropagators(prop),
otelmux.WithTracerProvider(provider),
))
router.HandleFunc("/with/public/endpoint", func(w http.ResponseWriter, r *http.Request) {
s := trace.SpanFromContext(r.Context())
sc := s.SpanContext()
// Should be with new root trace.
assert.True(t, sc.IsValid())
assert.False(t, sc.IsRemote())
assert.NotEqual(t, remoteSpan.TraceID, sc.TraceID())
})
r0 := httptest.NewRequest("GET", "/with/public/endpoint", nil)
w := httptest.NewRecorder()
sc := trace.NewSpanContext(remoteSpan)
ctx := trace.ContextWithSpanContext(context.Background(), sc)
prop.Inject(ctx, propagation.HeaderCarrier(r0.Header))
router.ServeHTTP(w, r0)
assert.Equal(t, http.StatusOK, w.Result().StatusCode) //nolint:bodyclose // False positive for httptest.ResponseRecorder: https://github.com/timakin/bodyclose/issues/59.
// Recorded span should be linked with an incoming span context.
assert.NoError(t, sr.ForceFlush(ctx))
done := sr.Ended()
require.Len(t, done, 1)
require.Len(t, done[0].Links(), 1, "should contain link")
require.True(t, sc.Equal(done[0].Links()[0].SpanContext), "should link incoming span context")
}
func TestWithPublicEndpointFn(t *testing.T) {
remoteSpan := trace.SpanContextConfig{
TraceID: trace.TraceID{0x01},
SpanID: trace.SpanID{0x01},
TraceFlags: trace.FlagsSampled,
Remote: true,
}
prop := propagation.TraceContext{}
testdata := []struct {
name string
fn func(*http.Request) bool
handlerAssert func(*testing.T, trace.SpanContext)
spansAssert func(*testing.T, trace.SpanContext, []sdktrace.ReadOnlySpan)
}{
{
name: "with the method returning true",
fn: func(r *http.Request) bool {
return true
},
handlerAssert: func(t *testing.T, sc trace.SpanContext) {
// Should be with new root trace.
assert.True(t, sc.IsValid())
assert.False(t, sc.IsRemote())
assert.NotEqual(t, remoteSpan.TraceID, sc.TraceID())
},
spansAssert: func(t *testing.T, sc trace.SpanContext, spans []sdktrace.ReadOnlySpan) {
require.Len(t, spans, 1)
require.Len(t, spans[0].Links(), 1, "should contain link")
require.True(t, sc.Equal(spans[0].Links()[0].SpanContext), "should link incoming span context")
},
},
{
name: "with the method returning false",
fn: func(r *http.Request) bool {
return false
},
handlerAssert: func(t *testing.T, sc trace.SpanContext) {
// Should have remote span as parent
assert.True(t, sc.IsValid())
assert.False(t, sc.IsRemote())
assert.Equal(t, remoteSpan.TraceID, sc.TraceID())
},
spansAssert: func(t *testing.T, _ trace.SpanContext, spans []sdktrace.ReadOnlySpan) {
require.Len(t, spans, 1)
require.Empty(t, spans[0].Links(), "should not contain link")
},
},
}
for _, tt := range testdata {
t.Run(tt.name, func(t *testing.T) {
sr := tracetest.NewSpanRecorder()
provider := sdktrace.NewTracerProvider()
provider.RegisterSpanProcessor(sr)
router := mux.NewRouter()
router.Use(otelmux.Middleware("foobar",
otelmux.WithPublicEndpointFn(tt.fn),
otelmux.WithPropagators(prop),
otelmux.WithTracerProvider(provider),
))
router.HandleFunc("/with/public/endpointfn", func(w http.ResponseWriter, r *http.Request) {
s := trace.SpanFromContext(r.Context())
tt.handlerAssert(t, s.SpanContext())
})
r0 := httptest.NewRequest("GET", "/with/public/endpointfn", nil)
w := httptest.NewRecorder()
sc := trace.NewSpanContext(remoteSpan)
ctx := trace.ContextWithSpanContext(context.Background(), sc)
prop.Inject(ctx, propagation.HeaderCarrier(r0.Header))
router.ServeHTTP(w, r0)
assert.Equal(t, http.StatusOK, w.Result().StatusCode) //nolint:bodyclose // False positive for httptest.ResponseRecorder: https://github.com/timakin/bodyclose/issues/59.
// Recorded span should be linked with an incoming span context.
assert.NoError(t, sr.ForceFlush(ctx))
spans := sr.Ended()
tt.spansAssert(t, sc, spans)
})
}
}
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