110 lines
3.3 KiB
Go
110 lines
3.3 KiB
Go
/*
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* Minio Cloud Storage, (C) 2019 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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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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// Following two fields are used only to make sure that Write(p) is called such that
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// len(p) is always the block size except the last block and prevent programmer errors.
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currentBlockIdx int
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lastBlockIdx int
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}
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func (b *wholeBitrotWriter) Write(p []byte) (int, error) {
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if b.currentBlockIdx < b.lastBlockIdx && int64(len(p)) != b.shardSize {
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// All blocks except last should be of the length b.shardSize
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logger.LogIf(context.Background(), errUnexpected)
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return 0, errUnexpected
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}
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err := b.disk.AppendFile(b.volume, b.filePath, p)
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if err != nil {
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logger.LogIf(context.Background(), 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(context.Background(), err)
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return 0, err
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}
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b.currentBlockIdx++
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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, length int64, algo BitrotAlgorithm, shardSize int64) io.WriteCloser {
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return &wholeBitrotWriter{disk, volume, filePath, shardSize, algo.New(), 0, int(length / shardSize)}
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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(b.volume, b.filePath, offset, b.buf, b.verifier); err != nil {
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ctx := context.Background()
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logger.GetReqInfo(ctx).AppendTags("disk", b.disk.String())
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logger.LogIf(ctx, 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(context.Background(), 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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