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100 lines
3.0 KiB
100 lines
3.0 KiB
/*
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* MinIO Cloud Storage, (C) 2016 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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"io"
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)
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// StorageAPI interface.
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type StorageAPI interface {
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// Stringified version of disk.
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String() string
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// Storage operations.
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IsOnline() bool // Returns true if disk is online.
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LastError() error
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Close() error
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DiskInfo() (info DiskInfo, err error)
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// Volume operations.
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MakeVol(volume string) (err error)
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ListVols() (vols []VolInfo, err error)
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StatVol(volume string) (vol VolInfo, err error)
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DeleteVol(volume string) (err error)
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// File operations.
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ListDir(volume, dirPath string, count int, leafFile string) ([]string, error)
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ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error)
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AppendFile(volume string, path string, buf []byte) (err error)
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CreateFile(volume, path string, size int64, reader io.Reader) error
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ReadFileStream(volume, path string, offset, length int64) (io.ReadCloser, error)
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RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error
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StatFile(volume string, path string) (file FileInfo, err error)
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DeleteFile(volume string, path string) (err error)
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// Write all data, syncs the data to disk.
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WriteAll(volume string, path string, buf []byte) (err error)
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// Read all.
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ReadAll(volume string, path string) (buf []byte, err error)
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}
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// storageReader is an io.Reader view of a disk
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type storageReader struct {
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storage StorageAPI
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volume, path string
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offset int64
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}
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func (r *storageReader) Read(p []byte) (n int, err error) {
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nn, err := r.storage.ReadFile(r.volume, r.path, r.offset, p, nil)
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r.offset += nn
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n = int(nn)
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if err == io.ErrUnexpectedEOF && nn > 0 {
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err = io.EOF
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}
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return
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}
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// storageWriter is a io.Writer view of a disk.
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type storageWriter struct {
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storage StorageAPI
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volume, path string
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}
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func (w *storageWriter) Write(p []byte) (n int, err error) {
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err = w.storage.AppendFile(w.volume, w.path, p)
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if err == nil {
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n = len(p)
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}
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return
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}
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// StorageWriter returns a new io.Writer which appends data to the file
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// at the given disk, volume and path.
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func StorageWriter(storage StorageAPI, volume, path string) io.Writer {
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return &storageWriter{storage, volume, path}
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}
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// StorageReader returns a new io.Reader which reads data to the file
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// at the given disk, volume, path and offset.
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func StorageReader(storage StorageAPI, volume, path string, offset int64) io.Reader {
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return &storageReader{storage, volume, path, offset}
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}
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