storj/uplink/eestream/rs_test.go

677 lines
19 KiB
Go
Raw Normal View History

2019-01-24 20:15:10 +00:00
// Copyright (C) 2019 Storj Labs, Inc.
2018-04-11 14:41:50 +01:00
// See LICENSE for copying information.
package eestream
import (
"bytes"
"context"
"crypto/sha256"
"errors"
"fmt"
2018-04-11 14:41:50 +01:00
"io"
"io/ioutil"
"math/rand"
2018-04-11 14:41:50 +01:00
"testing"
"time"
2018-04-11 14:41:50 +01:00
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
2018-04-11 14:41:50 +01:00
"github.com/vivint/infectious"
"github.com/zeebo/errs"
2019-07-31 15:38:44 +01:00
"go.uber.org/zap/zaptest"
"storj.io/storj/internal/memory"
"storj.io/storj/internal/readcloser"
"storj.io/storj/internal/testcontext"
"storj.io/storj/internal/testrand"
"storj.io/storj/pkg/encryption"
"storj.io/storj/pkg/ranger"
"storj.io/storj/pkg/storj"
2018-04-11 14:41:50 +01:00
)
func TestRS(t *testing.T) {
ctx := context.Background()
data := testrand.Bytes(32 * 1024)
2018-04-11 14:41:50 +01:00
fc, err := infectious.NewFEC(2, 4)
if err != nil {
t.Fatal(err)
}
es := NewRSScheme(fc, 8*1024)
rs, err := NewRedundancyStrategy(es, 0, 0)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), bytes.NewReader(data), rs)
if err != nil {
t.Fatal(err)
}
readerMap := make(map[int]io.ReadCloser, len(readers))
2018-04-11 14:41:50 +01:00
for i, reader := range readers {
readerMap[i] = reader
2018-04-11 14:41:50 +01:00
}
2019-07-31 15:38:44 +01:00
decoder := DecodeReaders(ctx, zaptest.NewLogger(t), readerMap, rs, 32*1024, 0, false)
defer func() { assert.NoError(t, decoder.Close()) }()
data2, err := ioutil.ReadAll(decoder)
2018-04-11 14:41:50 +01:00
if err != nil {
t.Fatal(err)
}
assert.Equal(t, data, data2)
2018-04-11 14:41:50 +01:00
}
// Check that io.ReadFull will return io.ErrUnexpectedEOF
// if DecodeReaders return less data than expected.
func TestRSUnexpectedEOF(t *testing.T) {
ctx := context.Background()
data := testrand.Bytes(32 * 1024)
fc, err := infectious.NewFEC(2, 4)
if err != nil {
t.Fatal(err)
}
es := NewRSScheme(fc, 8*1024)
rs, err := NewRedundancyStrategy(es, 0, 0)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), bytes.NewReader(data), rs)
if err != nil {
t.Fatal(err)
}
readerMap := make(map[int]io.ReadCloser, len(readers))
for i, reader := range readers {
readerMap[i] = reader
}
2019-07-31 15:38:44 +01:00
decoder := DecodeReaders(ctx, zaptest.NewLogger(t), readerMap, rs, 32*1024, 0, false)
defer func() { assert.NoError(t, decoder.Close()) }()
// Try ReadFull more data from DecodeReaders than available
data2 := make([]byte, len(data)+1024)
_, err = io.ReadFull(decoder, data2)
assert.EqualError(t, err, io.ErrUnexpectedEOF.Error())
}
func TestRSRanger(t *testing.T) {
ctx := context.Background()
data := testrand.Bytes(32 * 1024)
fc, err := infectious.NewFEC(2, 4)
if err != nil {
t.Fatal(err)
}
es := NewRSScheme(fc, 8*1024)
rs, err := NewRedundancyStrategy(es, 0, 0)
if err != nil {
t.Fatal(err)
}
encKey := storj.Key(sha256.Sum256([]byte("the secret key")))
var firstNonce storj.Nonce
const stripesPerBlock = 2
blockSize := stripesPerBlock * rs.StripeSize()
encrypter, err := encryption.NewEncrypter(storj.EncAESGCM, &encKey, &firstNonce, blockSize)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), encryption.TransformReader(PadReader(ioutil.NopCloser(
bytes.NewReader(data)), encrypter.InBlockSize()), encrypter, 0), rs)
if err != nil {
t.Fatal(err)
}
pieces, err := readAll(readers)
if err != nil {
t.Fatal(err)
}
rrs := map[int]ranger.Ranger{}
for i, piece := range pieces {
rrs[i] = ranger.ByteRanger(piece)
}
decrypter, err := encryption.NewDecrypter(storj.EncAESGCM, &encKey, &firstNonce, blockSize)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
rc, err := Decode(zaptest.NewLogger(t), rrs, rs, 0, false)
if err != nil {
t.Fatal(err)
}
rr, err := encryption.Transform(rc, decrypter)
if err != nil {
t.Fatal(err)
}
rr, err = UnpadSlow(ctx, rr)
if err != nil {
t.Fatal(err)
}
r, err := rr.Range(ctx, 0, rr.Size())
if err != nil {
t.Fatal(err)
}
data2, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(data, data2) {
t.Fatalf("rs encode/decode failed")
}
}
func TestNewRedundancyStrategy(t *testing.T) {
for i, tt := range []struct {
rep int
opt int
expRep int
expOpt int
errString string
}{
{0, 0, 4, 4, ""},
{-1, 0, 0, 0, "eestream error: negative repair threshold"},
{1, 0, 0, 0, "eestream error: repair threshold less than required count"},
{5, 0, 0, 0, "eestream error: repair threshold greater than total count"},
{0, -1, 0, 0, "eestream error: negative optimal threshold"},
{0, 1, 0, 0, "eestream error: optimal threshold less than required count"},
{0, 5, 0, 0, "eestream error: optimal threshold greater than total count"},
{3, 4, 3, 4, ""},
{0, 3, 0, 0, "eestream error: repair threshold greater than optimal threshold"},
{4, 3, 0, 0, "eestream error: repair threshold greater than optimal threshold"},
{4, 4, 4, 4, ""},
} {
errTag := fmt.Sprintf("Test case #%d", i)
fc, err := infectious.NewFEC(2, 4)
if !assert.NoError(t, err, errTag) {
continue
}
es := NewRSScheme(fc, 8*1024)
rs, err := NewRedundancyStrategy(es, tt.rep, tt.opt)
if tt.errString != "" {
assert.EqualError(t, err, tt.errString, errTag)
continue
}
assert.NoError(t, err, errTag)
assert.Equal(t, tt.expRep, rs.RepairThreshold(), errTag)
assert.Equal(t, tt.expOpt, rs.OptimalThreshold(), errTag)
}
}
// Some pieces will read error.
// Test will pass if at least required number of pieces are still good.
func TestRSErrors(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 1, 1, true},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 1, 2, 1, false},
{4 * 1024, 1024, 1, 2, 2, true},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{4 * 1024, 1024, 2, 4, 2, false},
{4 * 1024, 1024, 2, 4, 3, true},
{4 * 1024, 1024, 2, 4, 4, true},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 3, false},
{6 * 1024, 1024, 3, 7, 4, false},
{6 * 1024, 1024, 3, 7, 5, true},
{6 * 1024, 1024, 3, 7, 6, true},
{6 * 1024, 1024, 3, 7, 7, true},
} {
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
return readcloser.FatalReadCloser(
errors.New("I am an error piece"))
})
}
}
// Some pieces will read EOF at the beginning (byte 0).
// Test will pass if those pieces are less than required.
func TestRSEOF(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 1, 1, true},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 1, 2, 1, false},
{4 * 1024, 1024, 1, 2, 2, true},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{4 * 1024, 1024, 2, 4, 2, false},
{4 * 1024, 1024, 2, 4, 3, true},
{4 * 1024, 1024, 2, 4, 4, true},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 3, false},
{6 * 1024, 1024, 3, 7, 4, false},
{6 * 1024, 1024, 3, 7, 5, true},
{6 * 1024, 1024, 3, 7, 6, true},
{6 * 1024, 1024, 3, 7, 7, true},
} {
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
return readcloser.LimitReadCloser(
ioutil.NopCloser(bytes.NewReader(in)), 0)
})
}
}
// Some pieces will read EOF earlier than expected
// Test will pass if those pieces are less than required.
func TestRSEarlyEOF(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 1, 1, true},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 1, 2, 1, false},
{4 * 1024, 1024, 1, 2, 2, true},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{4 * 1024, 1024, 2, 4, 2, false},
{4 * 1024, 1024, 2, 4, 3, true},
{4 * 1024, 1024, 2, 4, 4, true},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 3, false},
{6 * 1024, 1024, 3, 7, 4, false},
{6 * 1024, 1024, 3, 7, 5, true},
{6 * 1024, 1024, 3, 7, 6, true},
{6 * 1024, 1024, 3, 7, 7, true},
} {
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
// Read EOF after 500 bytes
return readcloser.LimitReadCloser(
ioutil.NopCloser(bytes.NewReader(in)), 500)
})
}
}
// Some pieces will read EOF later than expected.
// Test will pass if at least required number of pieces are still good.
func TestRSLateEOF(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 1, 1, false},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 1, 2, 1, false},
{4 * 1024, 1024, 1, 2, 2, false},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{4 * 1024, 1024, 2, 4, 2, false},
{4 * 1024, 1024, 2, 4, 3, false},
{4 * 1024, 1024, 2, 4, 4, false},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 3, false},
{6 * 1024, 1024, 3, 7, 4, false},
{6 * 1024, 1024, 3, 7, 5, false},
{6 * 1024, 1024, 3, 7, 6, false},
{6 * 1024, 1024, 3, 7, 7, false},
} {
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
// extend the input with random number of random bytes
random := testrand.BytesInt(1 + testrand.Intn(10000))
extended := append(in, random...)
return ioutil.NopCloser(bytes.NewReader(extended))
})
}
}
// Some pieces will read random data.
// Test will pass if there are enough good pieces for error correction.
func TestRSRandomData(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 1, 1, true},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 1, 2, 1, true},
{4 * 1024, 1024, 1, 2, 2, true},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{4 * 1024, 1024, 2, 4, 2, true},
{4 * 1024, 1024, 2, 4, 3, true},
{4 * 1024, 1024, 2, 4, 4, true},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 4, true},
{6 * 1024, 1024, 3, 7, 5, true},
{6 * 1024, 1024, 3, 7, 6, true},
{6 * 1024, 1024, 3, 7, 7, true},
} {
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
// return random data instead of expected one
return ioutil.NopCloser(bytes.NewReader(testrand.BytesInt(len(in))))
})
}
}
// Some pieces will read slowly
func TestRSSlow(t *testing.T) {
for i, tt := range []testCase{
{4 * 1024, 1024, 1, 1, 0, false},
{4 * 1024, 1024, 1, 2, 0, false},
{4 * 1024, 1024, 2, 4, 0, false},
{4 * 1024, 1024, 2, 4, 1, false},
{6 * 1024, 1024, 3, 7, 0, false},
{6 * 1024, 1024, 3, 7, 1, false},
{6 * 1024, 1024, 3, 7, 2, false},
{6 * 1024, 1024, 3, 7, 3, false},
} {
start := time.Now()
testRSProblematic(t, tt, i, func(in []byte) io.ReadCloser {
// sleep 1 second before every read
return ioutil.NopCloser(SlowReader(bytes.NewReader(in), 1*time.Second))
})
if time.Since(start) > 1*time.Second {
t.Fatalf("waited for slow reader")
}
}
}
type testCase struct {
dataSize int
blockSize int
required int
total int
problematic int
fail bool
}
type problematicReadCloser func([]byte) io.ReadCloser
func testRSProblematic(t *testing.T, tt testCase, i int, fn problematicReadCloser) {
errTag := fmt.Sprintf("Test case #%d", i)
ctx := context.Background()
data := testrand.BytesInt(tt.dataSize)
fc, err := infectious.NewFEC(tt.required, tt.total)
if !assert.NoError(t, err, errTag) {
return
}
es := NewRSScheme(fc, tt.blockSize)
rs, err := NewRedundancyStrategy(es, 0, 0)
if !assert.NoError(t, err, errTag) {
return
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), bytes.NewReader(data), rs)
if !assert.NoError(t, err, errTag) {
return
}
// read all readers in []byte buffers to avoid deadlock if later
// we don't read in parallel from all of them
pieces, err := readAll(readers)
if !assert.NoError(t, err, errTag) {
return
}
readerMap := make(map[int]io.ReadCloser, len(readers))
// some readers will have problematic behavior
for i := 0; i < tt.problematic; i++ {
readerMap[i] = fn(pieces[i])
}
// the rest will operate normally
for i := tt.problematic; i < tt.total; i++ {
readerMap[i] = ioutil.NopCloser(bytes.NewReader(pieces[i]))
}
2019-07-31 15:38:44 +01:00
decoder := DecodeReaders(ctx, zaptest.NewLogger(t), readerMap, rs, int64(tt.dataSize), 3*1024, false)
defer func() { assert.NoError(t, decoder.Close()) }()
data2, err := ioutil.ReadAll(decoder)
if tt.fail {
if err == nil && bytes.Equal(data, data2) {
assert.Fail(t, "expected to fail, but didn't", errTag)
}
} else if assert.NoError(t, err, errTag) {
assert.Equal(t, data, data2, errTag)
}
}
func readAll(readers []io.ReadCloser) ([][]byte, error) {
pieces := make([][]byte, len(readers))
errors := make(chan error, len(readers))
for i := range readers {
go func(i int) {
var err error
pieces[i], err = ioutil.ReadAll(readers[i])
errors <- errs.Combine(err, readers[i].Close())
}(i)
}
for range readers {
err := <-errors
if err != nil {
return nil, err
}
}
return pieces, nil
}
func SlowReader(r io.Reader, delay time.Duration) io.Reader {
return &slowReader{Reader: r, Delay: delay}
}
type slowReader struct {
Reader io.Reader
Delay time.Duration
}
func (s *slowReader) Read(p []byte) (n int, err error) {
time.Sleep(s.Delay)
return s.Reader.Read(p)
}
func TestEncoderStalledReaders(t *testing.T) {
ctx := context.Background()
data := testrand.Bytes(120 * 1024)
fc, err := infectious.NewFEC(30, 60)
if err != nil {
t.Fatal(err)
}
es := NewRSScheme(fc, 1024)
rs, err := NewRedundancyStrategy(es, 35, 50)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), bytes.NewReader(data), rs)
if err != nil {
t.Fatal(err)
}
start := time.Now()
_, err = readAllStalled(readers, 25)
assert.NoError(t, err)
if time.Since(start) > 1*time.Second {
t.Fatalf("waited for slow reader")
}
for _, reader := range readers {
assert.NoError(t, reader.Close())
}
}
func readAllStalled(readers []io.ReadCloser, stalled int) ([][]byte, error) {
pieces := make([][]byte, len(readers))
errs := make(chan error, len(readers))
for i := stalled; i < len(readers); i++ {
go func(i int) {
var err error
pieces[i], err = ioutil.ReadAll(readers[i])
errs <- err
}(i)
}
for i := stalled; i < len(readers); i++ {
err := <-errs
if err != nil {
return nil, err
}
}
return pieces, nil
}
func TestDecoderErrorWithStalledReaders(t *testing.T) {
ctx := context.Background()
data := testrand.Bytes(10 * 1024)
fc, err := infectious.NewFEC(10, 20)
if err != nil {
t.Fatal(err)
}
es := NewRSScheme(fc, 1024)
rs, err := NewRedundancyStrategy(es, 0, 0)
if err != nil {
t.Fatal(err)
}
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), bytes.NewReader(data), rs)
if err != nil {
t.Fatal(err)
}
// read all readers in []byte buffers to avoid deadlock if later
// we don't read in parallel from all of them
pieces, err := readAll(readers)
if !assert.NoError(t, err) {
return
}
readerMap := make(map[int]io.ReadCloser, len(readers))
// just a few readers will operate normally
for i := 0; i < 4; i++ {
readerMap[i] = ioutil.NopCloser(bytes.NewReader(pieces[i]))
}
// some of the readers will be slow
for i := 4; i < 7; i++ {
readerMap[i] = ioutil.NopCloser(SlowReader(bytes.NewReader(pieces[i]), 1*time.Second))
}
// most of the readers will return error
for i := 7; i < 20; i++ {
readerMap[i] = readcloser.FatalReadCloser(errors.New("I am an error piece"))
}
2019-07-31 15:38:44 +01:00
decoder := DecodeReaders(ctx, zaptest.NewLogger(t), readerMap, rs, int64(10*1024), 0, false)
defer func() { assert.NoError(t, decoder.Close()) }()
// record the time for reading the data from the decoder
start := time.Now()
_, err = ioutil.ReadAll(decoder)
// we expect the decoder to fail with error as there are not enough good
// nodes to reconstruct the data
assert.Error(t, err)
// but without waiting for the slowest nodes
if time.Since(start) > 1*time.Second {
t.Fatalf("waited for slow reader")
}
}
func BenchmarkReedSolomonErasureScheme(b *testing.B) {
data := testrand.Bytes(8 << 20)
output := make([]byte, 8<<20)
confs := []struct{ required, total int }{
{2, 4},
{20, 50},
{30, 60},
{50, 80},
}
dataSizes := []int{
100,
1 << 10,
256 << 10,
1 << 20,
5 << 20,
8 << 20,
}
bytesToStr := func(bytes int) string {
switch {
case bytes > 10000000:
return fmt.Sprintf("%.fMB", float64(bytes)/float64(1<<20))
case bytes > 1000:
return fmt.Sprintf("%.fKB", float64(bytes)/float64(1<<10))
default:
return fmt.Sprintf("%dB", bytes)
}
}
for _, conf := range confs {
configuration := conf
confname := fmt.Sprintf("r%dt%d/", configuration.required, configuration.total)
for _, expDataSize := range dataSizes {
dataSize := (expDataSize / configuration.required) * configuration.required
testname := bytesToStr(dataSize)
forwardErrorCode, _ := infectious.NewFEC(configuration.required, configuration.total)
erasureScheme := NewRSScheme(forwardErrorCode, 8*1024)
b.Run("Encode/"+confname+testname, func(b *testing.B) {
b.SetBytes(int64(dataSize))
for i := 0; i < b.N; i++ {
err := erasureScheme.Encode(data[:dataSize], func(num int, data []byte) {
_, _ = num, data
})
if err != nil {
b.Fatal(err)
}
}
})
shares := []infectious.Share{}
err := erasureScheme.Encode(data[:dataSize], func(num int, data []byte) {
shares = append(shares, infectious.Share{
Number: num,
Data: append([]byte{}, data...),
})
})
if err != nil {
b.Fatal(err)
}
b.Run("Decode/"+confname+testname, func(b *testing.B) {
b.SetBytes(int64(dataSize))
shareMap := make(map[int][]byte, configuration.total*2)
for i := 0; i < b.N; i++ {
rand.Shuffle(len(shares), func(i, k int) {
shares[i], shares[k] = shares[k], shares[i]
})
offset := i % (configuration.total / 4)
n := configuration.required + 1 + offset
if n > configuration.total {
n = configuration.total
}
for k := range shareMap {
delete(shareMap, k)
}
for i := range shares[:n] {
shareMap[shares[i].Number] = shares[i].Data
}
_, err = erasureScheme.Decode(output[:dataSize], shareMap)
if err != nil {
b.Fatal(err)
}
}
})
}
}
}
func TestCalcPieceSize(t *testing.T) {
ctx := testcontext.New(t)
defer ctx.Cleanup()
for i, dataSize := range []int64{
0,
1,
1*memory.KiB.Int64() - uint32Size,
1 * memory.KiB.Int64(),
32*memory.KiB.Int64() - uint32Size,
32 * memory.KiB.Int64(),
32*memory.KiB.Int64() + 100,
} {
errTag := fmt.Sprintf("%d. %+v", i, dataSize)
fc, err := infectious.NewFEC(2, 4)
require.NoError(t, err, errTag)
es := NewRSScheme(fc, 1*memory.KiB.Int())
rs, err := NewRedundancyStrategy(es, 0, 0)
require.NoError(t, err, errTag)
calculatedSize := CalcPieceSize(dataSize, es)
randReader := ioutil.NopCloser(io.LimitReader(testrand.Reader(), dataSize))
2019-07-31 15:38:44 +01:00
readers, err := EncodeReader(ctx, zaptest.NewLogger(t), PadReader(randReader, es.StripeSize()), rs)
require.NoError(t, err, errTag)
for _, reader := range readers {
piece, err := ioutil.ReadAll(reader)
assert.NoError(t, err, errTag)
assert.EqualValues(t, calculatedSize, len(piece), errTag)
}
}
}