mirror of
https://github.com/yunionio/cloudpods.git
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112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
// Copyright 2019 Yunion
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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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package main
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import (
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"context"
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"os"
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"syscall"
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"bazil.org/fuse"
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"bazil.org/fuse/fs"
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"github.com/pkg/errors"
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)
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const (
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CONTENT_FILE_NAME = "content"
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META_FILE_NAME = "meta"
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)
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// Dir implements both Node and Handle for the root directory.
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type Dir struct{}
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func (Dir) Attr(ctx context.Context, a *fuse.Attr) error {
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a.Inode = 1
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a.Mode = os.ModeDir | 0755
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return nil
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}
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func (Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
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if name == CONTENT_FILE_NAME {
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return Content{}, nil
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} else if name == META_FILE_NAME {
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return Meta{}, nil
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}
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return nil, syscall.ENOENT
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}
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func (Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
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return dirDirs, nil
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}
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var (
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dirDirs = []fuse.Dirent{
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{Inode: 2, Name: CONTENT_FILE_NAME, Type: fuse.DT_File},
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{Inode: 3, Name: META_FILE_NAME, Type: fuse.DT_File},
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}
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)
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// Content implements both Node and Handle for the content file.
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type Content struct{}
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func NewContent() *Content {
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return &Content{}
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}
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func (Content) Attr(ctx context.Context, a *fuse.Attr) error {
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a.Inode = 2
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a.Mode = 0444
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a.Size = uint64(fetcherFs.GetSize())
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a.BlockSize = uint32(opt.Blocksize) * 1024 * 1024
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return nil
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}
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func (Content) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
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// fmt.Printf("req.Size %d, req.Offset %d, resp.Data %d", req.Size, req.Offset, len(resp.Data))
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if req.Offset >= 0 && req.Offset < fetcherFs.GetSize() {
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if req.Offset+int64(req.Size) > fetcherFs.GetSize() {
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req.Size = int(fetcherFs.GetSize() - req.Offset)
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}
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if data, err := fetcherFs.doRead(req.Size, req.Offset); err != nil {
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return err
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} else {
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resp.Data = data
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return nil
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}
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} else if req.Offset == fetcherFs.GetSize() {
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return nil
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} else {
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return errors.Errorf("bad offset %d", req.Offset)
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}
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}
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// Meta implements both Node and Handle for the meta file.
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type Meta struct{}
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func NewMeta() *Meta {
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return &Meta{}
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}
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func (Meta) Attr(ctx context.Context, a *fuse.Attr) error {
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a.Inode = 3
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a.Mode = 0444
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a.Size = uint64(len(fetcherFs.GetMeta()))
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return nil
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}
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func (Meta) ReadAll(ctx context.Context) ([]byte, error) {
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return []byte(fetcherFs.GetMeta()), nil
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}
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