pkg/tracing/http_test.go

172 lines
4.1 KiB
Go

/*
Copyright 2019 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package tracing_test
import (
"net/http"
"net/url"
"testing"
"github.com/google/go-cmp/cmp"
. "knative.dev/pkg/tracing"
"knative.dev/pkg/tracing/config"
. "knative.dev/pkg/tracing/testing"
)
type fakeWriter struct {
lastWrite *[]byte
}
func (fw fakeWriter) Header() http.Header {
return http.Header{}
}
func (fw fakeWriter) Write(data []byte) (int, error) {
*fw.lastWrite = data
return len(data), nil
}
func (fw fakeWriter) WriteHeader(statusCode int) {
}
type testHandler struct {
}
func (th *testHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("fake"))
}
func TestHTTPSpanMiddleware(t *testing.T) {
cfg := config.Config{
Backend: config.Zipkin,
Debug: true,
}
// Create tracer with reporter recorder
reporter, co := FakeZipkinExporter()
defer reporter.Close()
oct := NewOpenCensusTracer(co)
defer oct.Finish()
if err := oct.ApplyConfig(&cfg); err != nil {
t.Errorf("Failed to apply tracer config: %v", err)
}
next := testHandler{}
middleware := HTTPSpanMiddleware(&next)
var lastWrite []byte
fw := fakeWriter{lastWrite: &lastWrite}
req, err := http.NewRequest("GET", "http://test.example.com", nil)
if err != nil {
t.Errorf("Failed to make fake request: %v", err)
}
traceID := "821e0d50d931235a5ba3fa42eddddd8f"
req.Header["X-B3-Traceid"] = []string{traceID}
req.Header["X-B3-Spanid"] = []string{"b3bd5e1c4318c78a"}
middleware.ServeHTTP(fw, req)
// Assert our next handler was called
if diff := cmp.Diff([]byte("fake"), lastWrite); diff != "" {
t.Errorf("Got http response (-want, +got) = %v", diff)
}
spans := reporter.Flush()
if len(spans) != 1 {
t.Errorf("Got %d spans, expected 1: spans = %v", len(spans), spans)
}
if got := spans[0].TraceID.String(); got != traceID {
t.Errorf("spans[0].TraceID = %s, want %s", got, traceID)
}
}
func TestHTTPSpanIgnoringPaths(t *testing.T) {
cfg := config.Config{
Backend: config.Zipkin,
Debug: true,
}
// Create tracer with reporter recorder
reporter, co := FakeZipkinExporter()
defer reporter.Close()
oct := NewOpenCensusTracer(co)
defer oct.Finish()
if err := oct.ApplyConfig(&cfg); err != nil {
t.Errorf("Failed to apply tracer config: %v", err)
}
paths := []string{"/readyz"}
middleware := HTTPSpanIgnoringPaths(paths...)(&testHandler{})
testCases := map[string]struct {
path string
traced bool
}{
"traced": {
path: "/",
traced: true,
},
"ignored": {
path: paths[0],
traced: false,
},
}
for n, tc := range testCases {
t.Run(n, func(t *testing.T) {
var lastWrite []byte
fw := fakeWriter{lastWrite: &lastWrite}
u := &url.URL{
Scheme: "http",
Host: "test.example.com",
Path: tc.path,
}
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
t.Errorf("Failed to make fake request: %v", err)
}
traceID := "821e0d50d931235a5ba3fa42eddddd8f"
req.Header.Set("X-B3-Traceid", traceID)
req.Header.Set("X-B3-Spanid", "b3bd5e1c4318c78a")
middleware.ServeHTTP(fw, req)
// Assert our next handler was called
if diff := cmp.Diff([]byte("fake"), lastWrite); diff != "" {
t.Errorf("Got http response (-want, +got) = %v", diff)
}
spans := reporter.Flush()
if tc.traced {
if len(spans) != 1 {
t.Errorf("Got %d spans, expected 1: spans = %v", len(spans), spans)
}
if got := spans[0].TraceID.String(); got != traceID {
t.Errorf("spans[0].TraceID = %s, want %s", got, traceID)
}
} else {
if len(spans) != 0 {
t.Errorf("Got %d spans, expected 0: spans = %v", len(spans), spans)
}
}
})
}
}