istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/ledger/ledger_test.go (about)

     1  // Copyright 2019 Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ledger
    16  
    17  import (
    18  	"fmt"
    19  	"math/rand"
    20  	"strconv"
    21  	"strings"
    22  	"testing"
    23  	"time"
    24  
    25  	"github.com/google/uuid"
    26  	"github.com/spaolacci/murmur3"
    27  	"golang.org/x/sync/errgroup"
    28  
    29  	"istio.io/istio/pkg/test/util/assert"
    30  )
    31  
    32  func TestLongKeys(t *testing.T) {
    33  	longKey := "virtual-service/frontend/default"
    34  	l := smtLedger{tree: newSMT(hasher, nil, time.Minute)}
    35  	_, err := l.Put(longKey+"1", "1")
    36  	assert.NoError(t, err)
    37  	_, err = l.Put(longKey+"2", "2")
    38  	assert.NoError(t, err)
    39  	res, err := l.Get(longKey + "1")
    40  	assert.NoError(t, err)
    41  	assert.Equal(t, res, "1")
    42  	res, err = l.Get(longKey + "2")
    43  	assert.NoError(t, err)
    44  	assert.Equal(t, res, "2")
    45  	res, err = l.Get(longKey)
    46  	assert.NoError(t, err)
    47  	assert.Equal(t, res, "")
    48  }
    49  
    50  func TestGetAndPrevious(t *testing.T) {
    51  	l := smtLedger{tree: newSMT(hasher, nil, time.Minute)}
    52  	resultHashes := map[string]bool{}
    53  	l.Put("foo", "bar")
    54  	firstHash := l.RootHash()
    55  
    56  	resultHashes[l.RootHash()] = true
    57  	l.Put("foo", "baz")
    58  	resultHashes[l.RootHash()] = true
    59  	l.Put("second", "value")
    60  	resultHashes[l.RootHash()] = true
    61  	getResult, err := l.Get("foo")
    62  	assert.NoError(t, err)
    63  	assert.Equal(t, getResult, "baz")
    64  	getResult, err = l.Get("second")
    65  	assert.NoError(t, err)
    66  	assert.Equal(t, getResult, "value")
    67  	getResult, err = l.GetPreviousValue(firstHash, "foo")
    68  	assert.NoError(t, err)
    69  	assert.Equal(t, getResult, "bar")
    70  	if len(resultHashes) != 3 {
    71  		t.Fatal("Encountered has collision")
    72  	}
    73  }
    74  
    75  func TestOrderAgnosticism(t *testing.T) {
    76  	l := smtLedger{tree: newSMT(MyHasher, nil, time.Minute)}
    77  	_, err := l.Put("foo", "bar")
    78  	assert.NoError(t, err)
    79  	firstHash, err := l.Put("second", "value")
    80  	assert.NoError(t, err)
    81  	secondHash, err := l.Put("foo", "baz")
    82  	assert.NoError(t, err)
    83  	assert.Equal(t, firstHash != secondHash, true)
    84  	lastHash, err := l.Put("foo", "bar")
    85  	assert.NoError(t, err)
    86  	assert.Equal(t, firstHash, lastHash)
    87  }
    88  
    89  func MyHasher(data ...[]byte) (result []byte) {
    90  	hasher := murmur3.New64()
    91  	for i := 0; i < len(data); i++ {
    92  		hasher.Write(data[i])
    93  	}
    94  	result = hasher.Sum(nil)
    95  	hasher.Reset()
    96  	return
    97  }
    98  
    99  func TestCollision(t *testing.T) {
   100  	hit := false
   101  	HashCollider := func(data ...[]byte) []byte {
   102  		if hit {
   103  			return []byte{
   104  				0xde,
   105  				0xad,
   106  				0xbe,
   107  				0xef,
   108  				0xde,
   109  				0xad,
   110  				0xbe,
   111  				0xef,
   112  			}
   113  		}
   114  		return MyHasher(data...)
   115  	}
   116  	l := smtLedger{tree: newSMT(HashCollider, nil, time.Minute)}
   117  	hit = true
   118  	_, err := l.Put("foo", "bar")
   119  	assert.NoError(t, err)
   120  	_, err = l.Put("fhgwgads", "shouldcollide")
   121  	assert.NoError(t, err)
   122  	value, err := l.Get("foo")
   123  	assert.NoError(t, err)
   124  	assert.Equal(t, value, "bar")
   125  }
   126  
   127  func HashCollider(data ...[]byte) []byte {
   128  	return MyHasher(data...)
   129  }
   130  
   131  // nolint: gosec
   132  // test only code
   133  func BenchmarkScale(b *testing.B) {
   134  	const configSize = 100
   135  	b.ReportAllocs()
   136  	b.SetBytes(8)
   137  	l := &smtLedger{tree: newSMT(HashCollider, nil, time.Minute)}
   138  	var eg errgroup.Group
   139  	ids := make([]string, 0, configSize)
   140  	for i := 0; i < configSize; i++ {
   141  		ids = append(ids, addConfig(l, b))
   142  	}
   143  	b.ResetTimer()
   144  	for n := 0; n < b.N; n++ {
   145  		eg.Go(func() error {
   146  			_, err := l.Put(ids[rand.Int()%configSize], strconv.Itoa(rand.Int()))
   147  			_ = l.RootHash()
   148  			return err
   149  		})
   150  	}
   151  	if err := eg.Wait(); err != nil {
   152  		b.Fatalf("An error occurred putting new data on the ledger: %v", err)
   153  	}
   154  	b.StopTimer()
   155  }
   156  
   157  // nolint: gosec
   158  // test only code
   159  func addConfig(ledger Ledger, b *testing.B) string {
   160  	objectID := strings.Replace(uuid.New().String(), "-", "", -1)
   161  	_, err := ledger.Put(objectID, fmt.Sprintf("%d", rand.Int()))
   162  	assert.NoError(b, err)
   163  	return objectID
   164  }