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bytes.go
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bytes.go
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// Copyright (c) 2014 Couchbase, Inc.
//
// 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 test
import (
"bytes"
"reflect"
"testing"
"github.com/blevesearch/bleve/index/store"
)
// tests which focus on the byte ownership
// CommonTestReaderOwnsGetBytes attempts to mutate the returned bytes
// first, while the reader is still open, second after that reader is
// closed, then the original key is read again, to ensure these
// modifications did not cause panic, or mutate the stored value
func CommonTestReaderOwnsGetBytes(t *testing.T, s store.KVStore) {
originalKey := []byte("key")
originalVal := []byte("val")
// open a writer
writer, err := s.Writer()
if err != nil {
t.Fatal(err)
}
// write key/val
batch := writer.NewBatch()
batch.Set(originalKey, originalVal)
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
// close the writer
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// read key
returnedVal, err := reader.Get(originalKey)
if err != nil {
t.Fatal(err)
}
// check that it is the expected value
if !reflect.DeepEqual(returnedVal, originalVal) {
t.Fatalf("expected value: %v for '%s', got %v", originalVal, originalKey, returnedVal)
}
// mutate the returned value with reader still open
for i := range returnedVal {
returnedVal[i] = '1'
}
// read the key again
returnedVal2, err := reader.Get(originalKey)
if err != nil {
t.Fatal(err)
}
// check that it is the expected value
if !reflect.DeepEqual(returnedVal2, originalVal) {
t.Fatalf("expected value: %v for '%s', got %v", originalVal, originalKey, returnedVal2)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
// mutate the original returned value again
for i := range returnedVal {
returnedVal[i] = '2'
}
// open another reader
reader, err = s.Reader()
if err != nil {
t.Fatal(err)
}
// read the key again
returnedVal3, err := reader.Get(originalKey)
if err != nil {
t.Fatal(err)
}
// check that it is the expected value
if !reflect.DeepEqual(returnedVal3, originalVal) {
t.Fatalf("expected value: %v for '%s', got %v", originalVal, originalKey, returnedVal3)
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
// finally check that the value we mutated still has what we set it to
for i := range returnedVal {
if returnedVal[i] != '2' {
t.Errorf("expected byte to be '2', got %v", returnedVal[i])
}
}
}
func CommonTestWriterOwnsBytes(t *testing.T, s store.KVStore) {
keyBuffer := make([]byte, 5)
valBuffer := make([]byte, 5)
// open a writer
writer, err := s.Writer()
if err != nil {
t.Fatal(err)
}
// write key/val pairs reusing same buffer
batch := writer.NewBatch()
for i := 0; i < 10; i++ {
keyBuffer[0] = 'k'
keyBuffer[1] = 'e'
keyBuffer[2] = 'y'
keyBuffer[3] = '-'
keyBuffer[4] = byte('0' + i)
valBuffer[0] = 'v'
valBuffer[1] = 'a'
valBuffer[2] = 'l'
valBuffer[3] = '-'
valBuffer[4] = byte('0' + i)
batch.Set(keyBuffer, valBuffer)
}
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
// close the writer
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err := s.Reader()
if err != nil {
t.Fatal(err)
}
// check that we can read back what we expect
allks := make([][]byte, 0)
allvs := make([][]byte, 0)
iter := reader.RangeIterator(nil, nil)
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
allks = append(allks, copyk)
v := iter.Key()
copyv := make([]byte, len(v))
copy(copyv, v)
allvs = append(allvs, copyv)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
if len(allks) != 10 {
t.Fatalf("expected 10 k/v pairs, got %d", len(allks))
}
for i, key := range allks {
val := allvs[i]
if !bytes.HasSuffix(key, []byte{byte('0' + i)}) {
t.Errorf("expected key %v to end in %d", key, []byte{byte('0' + i)})
}
if !bytes.HasSuffix(val, []byte{byte('0' + i)}) {
t.Errorf("expected val %v to end in %d", val, []byte{byte('0' + i)})
}
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
// open a writer
writer, err = s.Writer()
if err != nil {
t.Fatal(err)
}
// now delete using same approach
batch = writer.NewBatch()
for i := 0; i < 10; i++ {
keyBuffer[0] = 'k'
keyBuffer[1] = 'e'
keyBuffer[2] = 'y'
keyBuffer[3] = '-'
keyBuffer[4] = byte('0' + i)
batch.Delete(keyBuffer)
}
err = writer.ExecuteBatch(batch)
if err != nil {
t.Fatal(err)
}
// close the writer
err = writer.Close()
if err != nil {
t.Fatal(err)
}
// open a reader
reader, err = s.Reader()
if err != nil {
t.Fatal(err)
}
// check that we can read back what we expect
allks = make([][]byte, 0)
iter = reader.RangeIterator(nil, nil)
for iter.Valid() {
// if we want to keep bytes from iteration we must copy
k := iter.Key()
copyk := make([]byte, len(k))
copy(copyk, k)
allks = append(allks, copyk)
v := iter.Key()
copyv := make([]byte, len(v))
copy(copyv, v)
allvs = append(allvs, copyv)
iter.Next()
}
err = iter.Close()
if err != nil {
t.Fatal(err)
}
if len(allks) != 0 {
t.Fatalf("expected 0 k/v pairs remaining, got %d", len(allks))
}
// close the reader
err = reader.Close()
if err != nil {
t.Fatal(err)
}
}