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/*
Copyright 2020 The Kubernetes 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 filterlatency
import (
"net/http"
"net/http/httptest"
"testing"
"time"
utilclock "k8s.io/apimachinery/pkg/util/clock"
)
func TestTrackStartedWithContextAlreadyHasFilterRecord(t *testing.T) {
filterName := "my-filter"
var (
callCount int
filterRecord *requestFilterRecord
)
handler := http.HandlerFunc(func(_ http.ResponseWriter, req *http.Request) {
// we expect the handler to be invoked just once.
callCount++
// we expect the filter record to be set in the context
filterRecord = requestFilterRecordFrom(req.Context())
})
requestFilterStarted := time.Now()
wrapped := trackStarted(handler, filterName, utilclock.NewFakeClock(requestFilterStarted))
testRequest, err := http.NewRequest(http.MethodGet, "/api/v1/namespaces", nil)
if err != nil {
t.Fatalf("failed to create new http request - %v", err)
}
testRequest = testRequest.WithContext(withRequestFilterRecord(testRequest.Context(), &requestFilterRecord{
name: "foo",
startedTimestamp: time.Now(),
}))
w := httptest.NewRecorder()
wrapped.ServeHTTP(w, testRequest)
if callCount != 1 {
t.Errorf("expected the given handler to be invoked once, but was actually invoked %d times", callCount)
}
if filterRecord == nil {
t.Fatal("expected a filter record in the request context, but got nil")
}
if filterName != filterRecord.name {
t.Errorf("expected filter name=%s but got=%s", filterName, filterRecord.name)
}
if requestFilterStarted != filterRecord.startedTimestamp {
t.Errorf("expected filter started timestamp=%s but got=%s", requestFilterStarted, filterRecord.startedTimestamp)
}
}
func TestTrackStartedWithContextDoesNotHaveFilterRecord(t *testing.T) {
filterName := "my-filter"
var (
callCount int
filterRecord *requestFilterRecord
)
handler := http.HandlerFunc(func(_ http.ResponseWriter, req *http.Request) {
// we expect the handler to be invoked just once.
callCount++
// we expect the filter record to be set in the context
filterRecord = requestFilterRecordFrom(req.Context())
})
requestFilterStarted := time.Now()
wrapped := trackStarted(handler, filterName, utilclock.NewFakeClock(requestFilterStarted))
testRequest, err := http.NewRequest(http.MethodGet, "/api/v1/namespaces", nil)
if err != nil {
t.Fatalf("failed to create new http request - %v", err)
}
w := httptest.NewRecorder()
wrapped.ServeHTTP(w, testRequest)
if callCount != 1 {
t.Errorf("expected the given handler to be invoked once, but was actually invoked %d times", callCount)
}
if filterRecord == nil {
t.Fatal("expected a filter record in the request context, but got nil")
}
if filterName != filterRecord.name {
t.Errorf("expected filter name=%s but got=%s", filterName, filterRecord.name)
}
if requestFilterStarted != filterRecord.startedTimestamp {
t.Errorf("expected filter started timestamp=%s but got=%s", requestFilterStarted, filterRecord.startedTimestamp)
}
}
func TestTrackCompletedContextHasFilterRecord(t *testing.T) {
var (
handlerCallCount int
actionCallCount int
filterRecordGot *requestFilterRecord
filterCompletedAtGot time.Time
)
handler := http.HandlerFunc(func(_ http.ResponseWriter, req *http.Request) {
// we expect the handler to be invoked just once.
handlerCallCount++
})
requestFilterEndedAt := time.Now()
wrapped := trackCompleted(handler, utilclock.NewFakeClock(requestFilterEndedAt), func(fr *requestFilterRecord, completedAt time.Time) {
actionCallCount++
filterRecordGot = fr
filterCompletedAtGot = completedAt
})
testRequest, err := http.NewRequest(http.MethodGet, "/api/v1/namespaces", nil)
if err != nil {
t.Fatalf("failed to create new http request - %v", err)
}
testRequest = testRequest.WithContext(withRequestFilterRecord(testRequest.Context(), &requestFilterRecord{}))
w := httptest.NewRecorder()
wrapped.ServeHTTP(w, testRequest)
if handlerCallCount != 1 {
t.Errorf("expected the given handler to be invoked once, but was actually invoked %d times", handlerCallCount)
}
if actionCallCount != 1 {
t.Errorf("expected the action callback to be invoked once, but was actually invoked %d times", actionCallCount)
}
if filterRecordGot == nil {
t.Fatal("expected a filter record in the request context, but got nil")
}
if requestFilterEndedAt != filterCompletedAtGot {
t.Errorf("expected filter ended timestamp=%s but got=%s", requestFilterEndedAt, filterCompletedAtGot)
}
}
func TestTrackCompletedContextDoesNotHaveFilterRecord(t *testing.T) {
var actionCallCount, handlerCallCount int
handler := http.HandlerFunc(func(_ http.ResponseWriter, req *http.Request) {
handlerCallCount++
})
wrapped := trackCompleted(handler, utilclock.NewFakeClock(time.Now()), func(_ *requestFilterRecord, _ time.Time) {
actionCallCount++
})
testRequest, err := http.NewRequest(http.MethodGet, "/api/v1/namespaces", nil)
if err != nil {
t.Fatalf("failed to create new http request - %v", err)
}
w := httptest.NewRecorder()
wrapped.ServeHTTP(w, testRequest)
if handlerCallCount != 1 {
t.Errorf("expected the given handler to be invoked once, but was actually invoked %d times", handlerCallCount)
}
if actionCallCount != 0 {
t.Errorf("expected the callback to not be invoked, but was actually invoked %d times", actionCallCount)
}
}
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