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// Copyright 2022 The OpenZipkin 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 http_test
import (
"net"
"net/http"
"testing"
"github.com/openzipkin/zipkin-go"
zipkinhttp "github.com/openzipkin/zipkin-go/middleware/http"
"github.com/openzipkin/zipkin-go/propagation/baggage"
)
const (
reqID = "X-Request-Id"
reqIDValue = "5a3553a7-4088-4ae0-8845-8314ebd59ddb"
customField = "custom-field"
customFieldValue = "custom-value"
)
func TestHTTPBaggage(t *testing.T) {
var (
tracer, _ = zipkin.NewTracer(nil)
tr, _ = zipkinhttp.NewTransport(tracer)
cli = &http.Client{Transport: tr}
srv = newServer(cli)
bagHandler = baggage.New(reqID, customField)
)
// attach server middleware to http server
srv.s.Handler = zipkinhttp.NewServerMiddleware(
tracer,
zipkinhttp.EnableBaggage(bagHandler),
)(srv.s.Handler)
// create listener
ln, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatalf("unable to create listener for http server: %+v", err)
}
defer func() {
_ = ln.Close()
}()
// start http server
go func() {
srv.s.Addr = ln.Addr().String()
_ = srv.s.Serve(ln)
}()
// generate request to handler1 with X-Request-Id set
req, err := http.NewRequest("GET", "http://"+ln.Addr().String()+"/handler1", nil)
if err != nil {
t.Fatalf("unable to create initial http request: %+v", err)
}
req.Header.Add(reqID, reqIDValue)
// send client request
if _, err = cli.Do(req); err != nil {
t.Errorf("unexpected http request error: %+v", err)
}
// check server inspection variables for correct baggage field propagation
if srv.resultHandler1 != reqIDValue {
t.Errorf("resultHandler1 expected propagated %s: want %s, have: %s",
reqID, reqIDValue, srv.resultHandler1)
}
if srv.result1Handler2 != reqIDValue {
t.Errorf("result1Handler2 expected propagated %s: want %s, have: %s",
reqID, reqIDValue, srv.result1Handler2)
}
if srv.result2Handler2 != customFieldValue {
t.Errorf("result2Handler2 expected propagated %s: want %s, have: %s",
customField, customFieldValue, srv.result2Handler2)
}
}
type server struct {
s *http.Server
c *http.Client
resultHandler1 string
result1Handler2 string
result2Handler2 string
}
func newServer(client *http.Client) *server {
mux := http.NewServeMux()
s := &server{
c: client,
s: &http.Server{Handler: mux},
}
mux.HandleFunc("/handler1", s.handler1)
mux.HandleFunc("/handler2", s.handler2)
return s
}
func (s *server) handler1(w http.ResponseWriter, h *http.Request) {
// store received request id for inspection
s.resultHandler1 = h.Header.Get(reqID)
// add additional baggage field
ctx := h.Context()
if span := zipkin.SpanFromContext(ctx); span != nil {
span.Context().Baggage.Add(customField, customFieldValue)
}
// call handler2
req, _ := http.NewRequestWithContext(ctx, "GET", "http://"+s.s.Addr+"/handler2", nil)
if _, err := s.c.Do(req); err != nil {
http.Error(w, http.StatusText(500), 500)
return
}
w.WriteHeader(201)
}
func (s *server) handler2(w http.ResponseWriter, h *http.Request) {
// store received request id for inspection
s.result1Handler2 = h.Header.Get(reqID)
s.result2Handler2 = h.Header.Get(customField)
w.WriteHeader(201)
}
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