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Copy pathbitrot-whole.go
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91 lines (82 loc) · 2.68 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"hash"
"io"
)
// Implementation to calculate bitrot for the whole file.
type wholeBitrotWriter struct {
disk StorageAPI
volume string
filePath string
shardSize int64 // This is the shard size of the erasure logic
hash.Hash // For bitrot hash
}
func (b *wholeBitrotWriter) Write(p []byte) (int, error) {
err := b.disk.AppendFile(context.TODO(), b.volume, b.filePath, p)
if err != nil {
return 0, err
}
_, err = b.Hash.Write(p)
if err != nil {
return 0, err
}
return len(p), nil
}
func (b *wholeBitrotWriter) Close() error {
return nil
}
// Returns whole-file bitrot writer.
func newWholeBitrotWriter(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm, shardSize int64) io.WriteCloser {
return &wholeBitrotWriter{disk, volume, filePath, shardSize, algo.New()}
}
// Implementation to verify bitrot for the whole file.
type wholeBitrotReader struct {
disk StorageAPI
volume string
filePath string
verifier *BitrotVerifier // Holds the bit-rot info
tillOffset int64 // Affects the length of data requested in disk.ReadFile depending on Read()'s offset
buf []byte // Holds bit-rot verified data
}
func (b *wholeBitrotReader) ReadAt(buf []byte, offset int64) (n int, err error) {
if b.buf == nil {
b.buf = make([]byte, b.tillOffset-offset)
if _, err := b.disk.ReadFile(context.TODO(), b.volume, b.filePath, offset, b.buf, b.verifier); err != nil {
return 0, err
}
}
if len(b.buf) < len(buf) {
return 0, errLessData
}
n = copy(buf, b.buf)
b.buf = b.buf[n:]
return n, nil
}
// Returns whole-file bitrot reader.
func newWholeBitrotReader(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm, tillOffset int64, sum []byte) *wholeBitrotReader {
return &wholeBitrotReader{
disk: disk,
volume: volume,
filePath: filePath,
verifier: &BitrotVerifier{algo, sum},
tillOffset: tillOffset,
buf: nil,
}
}