mirror of
https://github.com/minio/minio.git
synced 2024-12-25 22:55:54 -05:00
103 lines
3.2 KiB
Go
103 lines
3.2 KiB
Go
/*
|
|
* 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 (
|
|
"context"
|
|
"hash"
|
|
"io"
|
|
|
|
"github.com/minio/minio/cmd/logger"
|
|
)
|
|
|
|
// CreateFile creates a new bitrot encoded file spread over all available disks. CreateFile will create
|
|
// the file at the given volume and path. It will read from src until an io.EOF occurs. The given algorithm will
|
|
// be used to protect the erasure encoded file.
|
|
func (s *ErasureStorage) CreateFile(ctx context.Context, src io.Reader, volume, path string, buffer []byte, algorithm BitrotAlgorithm, writeQuorum int) (f ErasureFileInfo, err error) {
|
|
if !algorithm.Available() {
|
|
logger.LogIf(ctx, errBitrotHashAlgoInvalid)
|
|
return f, errBitrotHashAlgoInvalid
|
|
}
|
|
f.Checksums = make([][]byte, len(s.disks))
|
|
hashers := make([]hash.Hash, len(s.disks))
|
|
for i := range hashers {
|
|
hashers[i] = algorithm.New()
|
|
}
|
|
errChans, errs := make([]chan error, len(s.disks)), make([]error, len(s.disks))
|
|
for i := range errChans {
|
|
errChans[i] = make(chan error, 1) // create buffered channel to let finished go-routines die early
|
|
}
|
|
|
|
var blocks [][]byte
|
|
var n = len(buffer)
|
|
for n == len(buffer) {
|
|
n, err = io.ReadFull(src, buffer)
|
|
if n == 0 && err == io.EOF {
|
|
if f.Size != 0 { // don't write empty block if we have written to the disks
|
|
break
|
|
}
|
|
blocks = make([][]byte, len(s.disks)) // write empty block
|
|
} else if err == nil || (n > 0 && err == io.ErrUnexpectedEOF) {
|
|
blocks, err = s.ErasureEncode(ctx, buffer[:n])
|
|
if err != nil {
|
|
return f, err
|
|
}
|
|
} else {
|
|
logger.LogIf(ctx, err)
|
|
return f, err
|
|
}
|
|
|
|
for i := range errChans { // span workers
|
|
go erasureAppendFile(ctx, s.disks[i], volume, path, hashers[i], blocks[i], errChans[i])
|
|
}
|
|
for i := range errChans { // wait until all workers are finished
|
|
errs[i] = <-errChans[i]
|
|
}
|
|
if err = reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum); err != nil {
|
|
return f, err
|
|
}
|
|
s.disks = evalDisks(s.disks, errs)
|
|
f.Size += int64(n)
|
|
}
|
|
|
|
f.Algorithm = algorithm
|
|
for i, disk := range s.disks {
|
|
if disk == OfflineDisk {
|
|
continue
|
|
}
|
|
f.Checksums[i] = hashers[i].Sum(nil)
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
// erasureAppendFile appends the content of buf to the file on the given disk and updates computes
|
|
// the hash of the written data. It sends the write error (or nil) over the error channel.
|
|
func erasureAppendFile(ctx context.Context, disk StorageAPI, volume, path string, hash hash.Hash, buf []byte, errChan chan<- error) {
|
|
if disk == OfflineDisk {
|
|
logger.LogIf(ctx, errDiskNotFound)
|
|
errChan <- errDiskNotFound
|
|
return
|
|
}
|
|
err := disk.AppendFile(volume, path, buf)
|
|
if err != nil {
|
|
errChan <- err
|
|
return
|
|
}
|
|
hash.Write(buf)
|
|
errChan <- err
|
|
}
|