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package nethttp
import (
"net/http"
"net/http/httptest"
"testing"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/mocktracer"
)
func makeRequest(t *testing.T, url string, options ...ClientOption) []*mocktracer.MockSpan {
tr := &mocktracer.MockTracer{}
span := tr.StartSpan("toplevel")
client := &http.Client{Transport: &Transport{}}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
t.Fatal(err)
}
req = req.WithContext(opentracing.ContextWithSpan(req.Context(), span))
req, ht := TraceRequest(tr, req, options...)
resp, err := client.Do(req)
if err != nil {
t.Fatal(err)
}
_ = resp.Body.Close()
ht.Finish()
span.Finish()
return tr.FinishedSpans()
}
func TestClientTrace(t *testing.T) {
mux := http.NewServeMux()
mux.HandleFunc("/ok", func(w http.ResponseWriter, r *http.Request) {})
mux.HandleFunc("/redirect", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/ok", http.StatusTemporaryRedirect)
})
mux.HandleFunc("/fail", func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "failure", http.StatusInternalServerError)
})
srv := httptest.NewServer(mux)
defer srv.Close()
tests := []struct {
url string
num int
opts []ClientOption
opName string
}{
{url: "/ok", num: 3, opts: nil, opName: "HTTP Client"},
{url: "/redirect", num: 4, opts: []ClientOption{OperationName("client-span")}, opName: "client-span"},
{url: "/fail", num: 3, opts: nil, opName: "HTTP Client"},
}
for _, tt := range tests {
t.Log(tt.opName)
spans := makeRequest(t, srv.URL+tt.url, tt.opts...)
if got, want := len(spans), tt.num; got != want {
t.Fatalf("got %d spans, expected %d", got, want)
}
var rootSpan *mocktracer.MockSpan
for _, span := range spans {
if span.ParentID == 0 {
rootSpan = span
break
}
}
if rootSpan == nil {
t.Fatal("cannot find root span with ParentID==0")
}
foundClientSpan := false
for _, span := range spans {
if span.ParentID == rootSpan.SpanContext.SpanID {
foundClientSpan = true
if got, want := span.OperationName, tt.opName; got != want {
t.Fatalf("got %s operation name, expected %s", got, want)
}
}
if span.OperationName == "HTTP GET" {
logs := span.Logs()
if len(logs) < 6 {
t.Fatalf("got %d expected at least %d log events", len(logs), 6)
}
key := logs[0].Fields[0].Key
if key != "event" {
t.Fatalf("got %s expected, %s", key, "event")
}
v := logs[0].Fields[0].ValueString
if v != "GetConn" {
t.Fatalf("got %s expected, %s", v, "GetConn")
}
}
}
if !foundClientSpan {
t.Fatal("cannot find client span")
}
}
}
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