105b37f1b4
* swarm/api: fix build/tests on unsupported platforms Skip FUSE tests if FUSE is unavailable and change build constraints so the 'lesser' platforms aren't mentioned explicitly. The test are compiled on all platforms to prevent regressions in _fallback.go Also gofmt -w -s because why not. * internal/web3ext: fix swarmfs wrappers Remove inputFormatter specifications so users get an error when passing the wrong number of arguments. * swarm/api: improve FUSE-related logging and APIs The API now returns JSON objects instead of strings. Log messages for invalid arguments are removed.
134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// +build linux darwin freebsd
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// Data structures used for Fuse filesystem, serving directories and serving files to Fuse driver.
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package api
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import (
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"io"
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"os"
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"bazil.org/fuse"
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"bazil.org/fuse/fs"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/swarm/storage"
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"golang.org/x/net/context"
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)
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type FS struct {
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root *Dir
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}
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type Dir struct {
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inode uint64
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name string
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path string
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directories []*Dir
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files []*File
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}
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type File struct {
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inode uint64
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name string
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path string
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key storage.Key
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swarmApi *Api
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fileSize uint64
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reader storage.LazySectionReader
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}
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// Functions which satisfy the Fuse File System requests
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func (filesystem *FS) Root() (fs.Node, error) {
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return filesystem.root, nil
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}
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func (directory *Dir) Attr(ctx context.Context, a *fuse.Attr) error {
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a.Inode = directory.inode
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//TODO: need to get permission as argument
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a.Mode = os.ModeDir | 0500
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a.Uid = uint32(os.Getuid())
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a.Gid = uint32(os.Getegid())
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return nil
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}
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func (directory *Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
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if directory.files != nil {
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for _, n := range directory.files {
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if n.name == name {
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return n, nil
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}
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}
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}
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if directory.directories != nil {
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for _, n := range directory.directories {
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if n.name == name {
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return n, nil
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}
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}
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}
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return nil, fuse.ENOENT
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}
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func (d *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
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var children []fuse.Dirent
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if d.files != nil {
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for _, file := range d.files {
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children = append(children, fuse.Dirent{Inode: file.inode, Type: fuse.DT_File, Name: file.name})
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}
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}
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if d.directories != nil {
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for _, dir := range d.directories {
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children = append(children, fuse.Dirent{Inode: dir.inode, Type: fuse.DT_Dir, Name: dir.name})
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}
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}
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return children, nil
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}
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func (file *File) Attr(ctx context.Context, a *fuse.Attr) error {
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a.Inode = file.inode
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//TODO: need to get permission as argument
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a.Mode = 0500
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a.Uid = uint32(os.Getuid())
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a.Gid = uint32(os.Getegid())
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reader := file.swarmApi.Retrieve(file.key)
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quitC := make(chan bool)
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size, err := reader.Size(quitC)
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if err != nil {
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log.Warn("Couldnt file size of file %s : %v", file.path, err)
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a.Size = uint64(0)
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}
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a.Size = uint64(size)
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file.fileSize = a.Size
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return nil
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}
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var _ = fs.HandleReader(&File{})
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func (file *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
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buf := make([]byte, req.Size)
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reader := file.swarmApi.Retrieve(file.key)
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n, err := reader.ReadAt(buf, req.Offset)
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if err == io.ErrUnexpectedEOF || err == io.EOF {
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err = nil
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}
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resp.Data = buf[:n]
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return err
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}
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