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hash.go
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hash.go
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// Copyright 2022 The etcd 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 testutil
import (
"context"
"errors"
"fmt"
"os"
"testing"
"github.com/stretchr/testify/assert"
"go.etcd.io/bbolt"
"go.etcd.io/etcd/api/v3/mvccpb"
)
const (
// CompactionCycle is high prime used to test hash calculation between compactions.
CompactionCycle = 71
)
func TestCompactionHash(ctx context.Context, t *testing.T, h CompactionHashTestCase, compactionBatchLimit int) {
var totalRevisions int64 = 1210
assert.Less(t, int64(compactionBatchLimit), totalRevisions)
assert.Less(t, int64(CompactionCycle*10), totalRevisions)
var rev int64
for ; rev < totalRevisions; rev += CompactionCycle {
testCompactionHash(ctx, t, h, rev, rev+CompactionCycle)
}
testCompactionHash(ctx, t, h, rev, rev+totalRevisions)
}
type CompactionHashTestCase interface {
Put(ctx context.Context, key, value string) error
Delete(ctx context.Context, key string) error
HashByRev(ctx context.Context, rev int64) (KeyValueHash, error)
Defrag(ctx context.Context) error
Compact(ctx context.Context, rev int64) error
}
type KeyValueHash struct {
Hash uint32
CompactRevision int64
Revision int64
}
func testCompactionHash(ctx context.Context, t *testing.T, h CompactionHashTestCase, start, stop int64) {
for i := start; i <= stop; i++ {
if i%67 == 0 {
err := h.Delete(ctx, PickKey(i+83))
assert.NoError(t, err, "error on delete")
} else {
err := h.Put(ctx, PickKey(i), fmt.Sprint(i))
assert.NoError(t, err, "error on put")
}
}
hash1, err := h.HashByRev(ctx, stop)
assert.NoError(t, err, "error on hash (rev %v)", stop)
err = h.Compact(ctx, stop)
assert.NoError(t, err, "error on compact (rev %v)", stop)
err = h.Defrag(ctx)
assert.NoError(t, err, "error on defrag")
hash2, err := h.HashByRev(ctx, stop)
assert.NoError(t, err, "error on hash (rev %v)", stop)
assert.Equal(t, hash1, hash2, "hashes do not match on rev %v", stop)
}
func PickKey(i int64) string {
if i%(CompactionCycle*2) == 30 {
return "zenek"
}
if i%CompactionCycle == 30 {
return "xavery"
}
// Use low prime number to ensure repeats without alignment
switch i % 7 {
case 0:
return "alice"
case 1:
return "bob"
case 2:
return "celine"
case 3:
return "dominik"
case 4:
return "eve"
case 5:
return "frederica"
case 6:
return "gorge"
default:
panic("Can't count")
}
}
func CorruptBBolt(fpath string) error {
db, derr := bbolt.Open(fpath, os.ModePerm, &bbolt.Options{})
if derr != nil {
return derr
}
defer db.Close()
return db.Update(func(tx *bbolt.Tx) error {
b := tx.Bucket([]byte("key"))
if b == nil {
return errors.New("got nil bucket for 'key'")
}
keys, vals := [][]byte{}, [][]byte{}
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
keys = append(keys, k)
var kv mvccpb.KeyValue
if uerr := kv.Unmarshal(v); uerr != nil {
return uerr
}
kv.Key[0]++
kv.Value[0]++
v2, v2err := kv.Marshal()
if v2err != nil {
return v2err
}
vals = append(vals, v2)
}
for i := range keys {
if perr := b.Put(keys[i], vals[i]); perr != nil {
return perr
}
}
return nil
})
}