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// Copyright 2018, OpenCensus 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 ochttp_test
import (
"errors"
"net/http"
"net/http/httptest"
"strings"
"sync"
"testing"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/trace"
)
func TestSpanAnnotatingClientTrace(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
resp.Write([]byte("Hello, world!"))
}))
defer server.Close()
recorder := &testExporter{}
trace.RegisterExporter(recorder)
tr := ochttp.Transport{
NewClientTrace: ochttp.NewSpanAnnotatingClientTrace,
StartOptions: trace.StartOptions{
Sampler: trace.AlwaysSample(),
},
}
req, err := http.NewRequest("POST", server.URL, strings.NewReader("req-body"))
if err != nil {
t.Errorf("error creating request: %v", err)
}
resp, err := tr.RoundTrip(req)
if err != nil {
t.Errorf("response error: %v", err)
}
if err := resp.Body.Close(); err != nil {
t.Errorf("error closing response body: %v", err)
}
if got, want := resp.StatusCode, 200; got != want {
t.Errorf("resp.StatusCode=%d; want=%d", got, want)
}
if got, want := len(recorder.spans), 1; got != want {
t.Fatalf("span count=%d; want=%d", got, want)
}
var annotations []string
for _, annotation := range recorder.spans[0].Annotations {
annotations = append(annotations, annotation.Message)
}
required := []string{
"GetConn", "GotConn", "GotFirstResponseByte", "ConnectStart",
"ConnectDone", "WroteHeaders", "WroteRequest",
}
if errs := requiredAnnotations(required, annotations); len(errs) > 0 {
for _, err := range errs {
t.Error(err)
}
}
}
type testExporter struct {
mu sync.Mutex
spans []*trace.SpanData
}
func (t *testExporter) ExportSpan(s *trace.SpanData) {
t.mu.Lock()
t.spans = append(t.spans, s)
t.mu.Unlock()
}
func requiredAnnotations(required []string, list []string) []error {
var errs []error
for _, item := range required {
var found bool
for _, v := range list {
if v == item {
found = true
}
}
if !found {
errs = append(errs, errors.New("missing expected annotation: "+item))
}
}
return errs
}
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