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123 lines
4.6 KiB
123 lines
4.6 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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"context"
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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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IsLocal() bool
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Hostname() string // Returns host name if remote host.
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Close() error
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GetDiskID() (string, error)
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SetDiskID(id string)
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DiskInfo(ctx context.Context) (info DiskInfo, err error)
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CrawlAndGetDataUsage(ctx context.Context, cache dataUsageCache) (dataUsageCache, error)
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// Volume operations.
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MakeVol(ctx context.Context, volume string) (err error)
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MakeVolBulk(ctx context.Context, volumes ...string) (err error)
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ListVols(ctx context.Context) (vols []VolInfo, err error)
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StatVol(ctx context.Context, volume string) (vol VolInfo, err error)
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DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error)
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// WalkVersions in sorted order directly on disk.
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WalkVersions(ctx context.Context, volume, dirPath, marker string, recursive bool, endWalkCh <-chan struct{}) (chan FileInfoVersions, error)
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// Walk in sorted order directly on disk.
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Walk(ctx context.Context, volume, dirPath, marker string, recursive bool, endWalkCh <-chan struct{}) (chan FileInfo, error)
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// Walk in sorted order directly on disk.
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WalkSplunk(ctx context.Context, volume, dirPath, marker string, endWalkCh <-chan struct{}) (chan FileInfo, error)
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// Metadata operations
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DeleteVersion(ctx context.Context, volume, path string, fi FileInfo) error
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DeleteVersions(ctx context.Context, volume string, versions []FileInfo) []error
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WriteMetadata(ctx context.Context, volume, path string, fi FileInfo) error
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ReadVersion(ctx context.Context, volume, path, versionID string) (FileInfo, error)
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RenameData(ctx context.Context, srcVolume, srcPath, dataDir, dstVolume, dstPath string) error
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// File operations.
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ListDir(ctx context.Context, volume, dirPath string, count int) ([]string, error)
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ReadFile(ctx context.Context, volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error)
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AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error)
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CreateFile(ctx context.Context, volume, path string, size int64, reader io.Reader) error
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ReadFileStream(ctx context.Context, volume, path string, offset, length int64) (io.ReadCloser, error)
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RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) error
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CheckParts(ctx context.Context, volume string, path string, fi FileInfo) error
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CheckFile(ctx context.Context, volume string, path string) (err error)
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DeleteFile(ctx context.Context, volume string, path string) (err error)
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VerifyFile(ctx context.Context, volume, path string, fi FileInfo) error
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// Write all data, syncs the data to disk.
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WriteAll(ctx context.Context, volume string, path string, reader io.Reader) (err error)
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// Read all.
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ReadAll(ctx context.Context, 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(context.TODO(), 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(context.TODO(), 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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