|
- // Copyright 2017 Google LLC
- //
- // 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.
-
- // +build go1.7
-
- package trace
-
- import (
- "io/ioutil"
- "net/http"
- "net/http/httptest"
- "strings"
- "testing"
- )
-
- type recorderTransport struct {
- ch chan *http.Request
- }
-
- func (rt *recorderTransport) RoundTrip(req *http.Request) (*http.Response, error) {
- rt.ch <- req
- resp := &http.Response{
- Status: "200 OK",
- StatusCode: 200,
- Body: ioutil.NopCloser(strings.NewReader("{}")),
- }
- return resp, nil
- }
-
- func TestNewHTTPClient(t *testing.T) {
- rt := &recorderTransport{
- ch: make(chan *http.Request, 1),
- }
-
- tc := newTestClient(&noopTransport{})
- client := &http.Client{
- Transport: &Transport{
- Base: rt,
- },
- }
- req, _ := http.NewRequest("GET", "http://example.com", nil)
-
- t.Run("NoTrace", func(t *testing.T) {
- _, err := client.Do(req)
- if err != nil {
- t.Error(err)
- }
- outgoing := <-rt.ch
- if got, want := outgoing.Header.Get(httpHeader), ""; want != got {
- t.Errorf("got trace header = %q; want none", got)
- }
- })
-
- t.Run("Trace", func(t *testing.T) {
- span := tc.NewSpan("/foo")
-
- req = req.WithContext(NewContext(req.Context(), span))
- _, err := client.Do(req)
- if err != nil {
- t.Error(err)
- }
- outgoing := <-rt.ch
-
- s := tc.SpanFromHeader("/foo", outgoing.Header.Get(httpHeader))
- if got, want := s.TraceID(), span.TraceID(); got != want {
- t.Errorf("trace ID = %q; want %q", got, want)
- }
- })
- }
-
- func TestHTTPHandlerNoTrace(t *testing.T) {
- tc := newTestClient(&noopTransport{})
- client := &http.Client{
- Transport: &Transport{},
- }
- handler := tc.HTTPHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
- span := FromContext(r.Context())
- if span == nil {
- t.Errorf("span is nil; want non-nil span")
- }
- }))
-
- ts := httptest.NewServer(handler)
- defer ts.Close()
-
- req, _ := http.NewRequest("GET", ts.URL, nil)
- _, err := client.Do(req)
- if err != nil {
- t.Fatal(err)
- }
- }
-
- func TestHTTPHandler_response(t *testing.T) {
- tc := newTestClient(&noopTransport{})
- p, _ := NewLimitedSampler(1, 1<<32) // all
- tc.SetSamplingPolicy(p)
- handler := tc.HTTPHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
- ts := httptest.NewServer(handler)
- defer ts.Close()
-
- tests := []struct {
- name string
- traceHeader string
- wantTraceHeader string
- }{
- {
- name: "no global",
- traceHeader: "0123456789ABCDEF0123456789ABCDEF/123",
- wantTraceHeader: "0123456789ABCDEF0123456789ABCDEF/123;o=1",
- },
- {
- name: "global=1",
- traceHeader: "0123456789ABCDEF0123456789ABCDEF/123;o=1",
- wantTraceHeader: "",
- },
- {
- name: "global=0",
- traceHeader: "0123456789ABCDEF0123456789ABCDEF/123;o=0",
- wantTraceHeader: "",
- },
- {
- name: "no trace context",
- traceHeader: "",
- wantTraceHeader: "",
- },
- }
-
- for _, tt := range tests {
- req, _ := http.NewRequest("GET", ts.URL, nil)
- req.Header.Set(httpHeader, tt.traceHeader)
-
- res, err := http.DefaultClient.Do(req)
- if err != nil {
- t.Errorf("failed to request: %v", err)
- }
- if got, want := res.Header.Get(httpHeader), tt.wantTraceHeader; got != want {
- t.Errorf("%v: response context header = %q; want %q", tt.name, got, want)
- }
- }
- }
|