github.com/zppinho/prow@v0.0.0-20240510014325-1738badeb017/pkg/ghcache/partitioner_test.go (about)

     1  /*
     2  Copyright 2020 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package ghcache
    18  
    19  import (
    20  	"net/http"
    21  	"sync"
    22  	"testing"
    23  	"time"
    24  )
    25  
    26  type fakeRoundTripperCreator struct {
    27  	t             *testing.T
    28  	lock          *sync.Mutex
    29  	roundTrippers map[string]*fakeRoundTripper
    30  }
    31  
    32  func (frtc *fakeRoundTripperCreator) createRoundTripper(partitionKey string, expiresAt *time.Time) http.RoundTripper {
    33  	frtc.lock.Lock()
    34  	defer frtc.lock.Unlock()
    35  	_, alreadyExists := frtc.roundTrippers[partitionKey]
    36  	if alreadyExists {
    37  		frtc.t.Fatalf("creation of already existing partition %q was requested", partitionKey)
    38  	}
    39  	frtc.roundTrippers[partitionKey] = &fakeRoundTripper{lock: &sync.Mutex{}}
    40  	return frtc.roundTrippers[partitionKey]
    41  }
    42  
    43  type fakeRoundTripper struct {
    44  	lock *sync.Mutex
    45  	used bool
    46  }
    47  
    48  func (frt *fakeRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
    49  	frt.lock.Lock()
    50  	frt.used = true
    51  	frt.lock.Unlock()
    52  	return &http.Response{}, nil
    53  }
    54  
    55  func TestPartitioningRoundTripper(t *testing.T) {
    56  	creator := &fakeRoundTripperCreator{
    57  		t:             t,
    58  		lock:          &sync.Mutex{},
    59  		roundTrippers: map[string]*fakeRoundTripper{},
    60  	}
    61  	partitioningRoundTripper := newPartitioningRoundTripper(creator.createRoundTripper)
    62  
    63  	requests := []*http.Request{
    64  		{Header: http.Header(map[string][]string{"Authorization": {"a"}})},
    65  		{Header: http.Header(map[string][]string{"Authorization": {"a"}})},
    66  		{Header: http.Header(map[string][]string{"Authorization": {"b"}})},
    67  		{Header: http.Header(map[string][]string{"Authorization": {"b"}})},
    68  		{Header: http.Header(map[string][]string{"Authorization": {"c"}})},
    69  		{Header: http.Header(map[string][]string{"Authorization": {"c"}})},
    70  	}
    71  
    72  	// Do these in parallel to verify thread safety
    73  	wg := &sync.WaitGroup{}
    74  	for _, request := range requests {
    75  		wg.Add(1)
    76  		request := request
    77  		go func() {
    78  			defer wg.Done()
    79  			_, err := partitioningRoundTripper.RoundTrip(request)
    80  			if err != nil {
    81  				t.Errorf("RoundTrip: %v", err)
    82  			}
    83  		}()
    84  	}
    85  	wg.Wait()
    86  
    87  	if n := len(creator.roundTrippers); n != 3 {
    88  		t.Errorf("expected three roundtrippers, got %d (%v)", n, creator.roundTrippers)
    89  	}
    90  	for name, roundTripper := range creator.roundTrippers {
    91  		if !roundTripper.used {
    92  			t.Errorf("roundtripper %q wasnt used", name)
    93  		}
    94  	}
    95  }