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/*
* Minio Cloud Storage, (C) 2016 Minio, 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 cmd
import (
"bytes"
"crypto/rand"
"io"
"os"
"testing"
)
var erasureDecodeTests = []struct {
dataBlocks, parityBlocks int
missingData, missingParity int
reconstructParity bool
shouldFail bool
}{
{dataBlocks: 2, parityBlocks: 2, missingData: 0, missingParity: 0, reconstructParity: true, shouldFail: false},
{dataBlocks: 3, parityBlocks: 3, missingData: 1, missingParity: 0, reconstructParity: true, shouldFail: false},
{dataBlocks: 4, parityBlocks: 4, missingData: 2, missingParity: 0, reconstructParity: false, shouldFail: false},
{dataBlocks: 5, parityBlocks: 5, missingData: 0, missingParity: 1, reconstructParity: true, shouldFail: false},
{dataBlocks: 6, parityBlocks: 6, missingData: 0, missingParity: 2, reconstructParity: true, shouldFail: false},
{dataBlocks: 7, parityBlocks: 7, missingData: 1, missingParity: 1, reconstructParity: false, shouldFail: false},
{dataBlocks: 8, parityBlocks: 8, missingData: 3, missingParity: 2, reconstructParity: false, shouldFail: false},
{dataBlocks: 2, parityBlocks: 2, missingData: 2, missingParity: 1, reconstructParity: true, shouldFail: true},
{dataBlocks: 4, parityBlocks: 2, missingData: 2, missingParity: 2, reconstructParity: false, shouldFail: true},
{dataBlocks: 8, parityBlocks: 4, missingData: 2, missingParity: 2, reconstructParity: false, shouldFail: false},
}
func TestErasureDecode(t *testing.T) {
data := make([]byte, 256)
if _, err := io.ReadFull(rand.Reader, data); err != nil {
t.Fatalf("Failed to read random data: %v", err)
}
for i, test := range erasureDecodeTests {
buffer := make([]byte, len(data), 2*len(data))
copy(buffer, data)
disks := make([]StorageAPI, test.dataBlocks+test.parityBlocks)
storage, err := NewErasureStorage(disks, test.dataBlocks, test.parityBlocks, blockSizeV1)
if err != nil {
t.Fatalf("Test %d: failed to create erasure storage: %v", i, err)
}
encoded, err := storage.ErasureEncode(buffer)
if err != nil {
t.Fatalf("Test %d: failed to encode data: %v", i, err)
}
for j := range encoded[:test.missingData] {
encoded[j] = nil
}
for j := test.dataBlocks; j < test.dataBlocks+test.missingParity; j++ {
encoded[j] = nil
}
if test.reconstructParity {
err = storage.ErasureDecodeDataAndParityBlocks(encoded)
} else {
err = storage.ErasureDecodeDataBlocks(encoded)
}
if err == nil && test.shouldFail {
t.Errorf("Test %d: test should fail but it passed", i)
}
if err != nil && !test.shouldFail {
t.Errorf("Test %d: test should pass but it failed: %v", i, err)
}
decoded := encoded
if !test.shouldFail {
if test.reconstructParity {
for j := range decoded {
if decoded[j] == nil {
t.Errorf("Test %d: failed to reconstruct shard %d", i, j)
}
}
} else {
for j := range decoded[:test.dataBlocks] {
if decoded[j] == nil {
t.Errorf("Test %d: failed to reconstruct data shard %d", i, j)
}
}
}
decodedData := new(bytes.Buffer)
if _, err = writeDataBlocks(decodedData, decoded, test.dataBlocks, 0, int64(len(data))); err != nil {
t.Errorf("Test %d: failed to write data blocks: %v", i, err)
}
if !bytes.Equal(decodedData.Bytes(), data) {
t.Errorf("Test %d: Decoded data does not match original data: got: %v want: %v", i, decodedData.Bytes(), data)
}
}
}
}
// Setup for erasureCreateFile and erasureReadFile tests.
type erasureTestSetup struct {
dataBlocks int
parityBlocks int
blockSize int64
diskPaths []string
disks []StorageAPI
}
// Removes the temporary disk directories.
func (e erasureTestSetup) Remove() {
for _, path := range e.diskPaths {
os.RemoveAll(path)
}
}
// Returns an initialized setup for erasure tests.
func newErasureTestSetup(dataBlocks int, parityBlocks int, blockSize int64) (*erasureTestSetup, error) {
diskPaths := make([]string, dataBlocks+parityBlocks)
disks := make([]StorageAPI, len(diskPaths))
var err error
for i := range diskPaths {
disks[i], diskPaths[i], err = newPosixTestSetup()
if err != nil {
return nil, err
}
err = disks[i].MakeVol("testbucket")
if err != nil {
return nil, err
}
}
return &erasureTestSetup{dataBlocks, parityBlocks, blockSize, diskPaths, disks}, nil
}