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