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// Copyright 2015 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 wal
import (
"bytes"
"errors"
"hash/crc32"
"io"
"os"
"reflect"
"testing"
"go.etcd.io/etcd/client/pkg/v3/fileutil"
"go.etcd.io/etcd/server/v3/wal/walpb"
)
var (
infoData = []byte("\b\xef\xfd\x02")
infoRecord = append([]byte("\x0e\x00\x00\x00\x00\x00\x00\x00\b\x01\x10\x99\xb5\xe4\xd0\x03\x1a\x04"), infoData...)
)
func TestReadRecord(t *testing.T) {
badInfoRecord := make([]byte, len(infoRecord))
copy(badInfoRecord, infoRecord)
badInfoRecord[len(badInfoRecord)-1] = 'a'
tests := []struct {
data []byte
wr *walpb.Record
we error
}{
{infoRecord, &walpb.Record{Type: 1, Crc: crc32.Checksum(infoData, crcTable), Data: infoData}, nil},
{[]byte(""), &walpb.Record{}, io.EOF},
{infoRecord[:14], &walpb.Record{}, io.ErrUnexpectedEOF},
{infoRecord[:len(infoRecord)-len(infoData)], &walpb.Record{}, io.ErrUnexpectedEOF},
{infoRecord[:len(infoRecord)-8], &walpb.Record{}, io.ErrUnexpectedEOF},
{badInfoRecord, &walpb.Record{}, walpb.ErrCRCMismatch},
}
rec := &walpb.Record{}
for i, tt := range tests {
buf := bytes.NewBuffer(tt.data)
f, err := createFileWithData(t, buf)
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
decoder := newDecoder(fileutil.NewFileReader(f))
e := decoder.decode(rec)
if !reflect.DeepEqual(rec, tt.wr) {
t.Errorf("#%d: block = %v, want %v", i, rec, tt.wr)
}
if !errors.Is(e, tt.we) {
t.Errorf("#%d: err = %v, want %v", i, e, tt.we)
}
rec = &walpb.Record{}
}
}
func TestWriteRecord(t *testing.T) {
b := &walpb.Record{}
typ := int64(0xABCD)
d := []byte("Hello world!")
buf := new(bytes.Buffer)
e := newEncoder(buf, 0, 0)
e.encode(&walpb.Record{Type: typ, Data: d})
e.flush()
f, err := createFileWithData(t, buf)
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
decoder := newDecoder(fileutil.NewFileReader(f))
err = decoder.decode(b)
if err != nil {
t.Errorf("err = %v, want nil", err)
}
if b.Type != typ {
t.Errorf("type = %d, want %d", b.Type, typ)
}
if !reflect.DeepEqual(b.Data, d) {
t.Errorf("data = %v, want %v", b.Data, d)
}
}
func createFileWithData(t *testing.T, bf *bytes.Buffer) (*os.File, error) {
f, err := os.CreateTemp(t.TempDir(), "wal")
if err != nil {
return nil, err
}
if _, err := f.Write(bf.Bytes()); err != nil {
return nil, err
}
f.Seek(0, 0)
return f, nil
}
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