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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 (
"net/http"
"net/http/httptest"
"testing"
"github.com/google/go-cmp/cmp"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
func TestWithRouteTag(t *testing.T) {
v := &view.View{
Name: "request_total",
Measure: ochttp.ServerLatency,
Aggregation: view.Count(),
TagKeys: []tag.Key{ochttp.KeyServerRoute},
}
view.Register(v)
var e testStatsExporter
view.RegisterExporter(&e)
defer view.UnregisterExporter(&e)
mux := http.NewServeMux()
handler := ochttp.WithRouteTag(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(204)
}), "/a/")
mux.Handle("/a/", handler)
plugin := ochttp.Handler{Handler: mux}
req, _ := http.NewRequest("GET", "/a/b/c", nil)
rr := httptest.NewRecorder()
plugin.ServeHTTP(rr, req)
if got, want := rr.Code, 204; got != want {
t.Fatalf("Unexpected response, got %d; want %d", got, want)
}
view.Unregister(v) // trigger exporting
got := e.rowsForView("request_total")
for i := range got {
view.ClearStart(got[i].Data)
}
want := []*view.Row{
{Data: &view.CountData{Value: 1}, Tags: []tag.Tag{{Key: ochttp.KeyServerRoute, Value: "/a/"}}},
}
if diff := cmp.Diff(got, want); diff != "" {
t.Errorf("Unexpected view data exported, -got, +want: %s", diff)
}
}
func TestSetRoute(t *testing.T) {
v := &view.View{
Name: "request_total",
Measure: ochttp.ServerLatency,
Aggregation: view.Count(),
TagKeys: []tag.Key{ochttp.KeyServerRoute},
}
view.Register(v)
var e testStatsExporter
view.RegisterExporter(&e)
defer view.UnregisterExporter(&e)
mux := http.NewServeMux()
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ochttp.SetRoute(r.Context(), "/a/")
w.WriteHeader(204)
})
mux.Handle("/a/", handler)
plugin := ochttp.Handler{Handler: mux}
req, _ := http.NewRequest("GET", "/a/b/c", nil)
rr := httptest.NewRecorder()
plugin.ServeHTTP(rr, req)
if got, want := rr.Code, 204; got != want {
t.Fatalf("Unexpected response, got %d; want %d", got, want)
}
view.Unregister(v) // trigger exporting
got := e.rowsForView("request_total")
for i := range got {
view.ClearStart(got[i].Data)
}
want := []*view.Row{
{Data: &view.CountData{Value: 1}, Tags: []tag.Tag{{Key: ochttp.KeyServerRoute, Value: "/a/"}}},
}
if diff := cmp.Diff(got, want); diff != "" {
t.Errorf("Unexpected view data exported, -got, +want: %s", diff)
}
}
type testStatsExporter struct {
vd []*view.Data
}
func (t *testStatsExporter) ExportView(d *view.Data) {
t.vd = append(t.vd, d)
}
func (t *testStatsExporter) rowsForView(name string) []*view.Row {
var rows []*view.Row
for _, d := range t.vd {
if d.View.Name == name {
rows = append(rows, d.Rows...)
}
}
return rows
}
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