swarm: codebase split from go-ethereum (#1405)
This commit is contained in:
Rafael Matias
committed by
Anton Evangelatov
Anton Evangelatov
parent
7a22da98b9
commit
b046760db1
292
api/filesystem.go
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292
api/filesystem.go
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// Copyright 2016 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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package api
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"path"
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"path/filepath"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethersphere/swarm/log"
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"github.com/ethersphere/swarm/storage"
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)
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const maxParallelFiles = 5
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type FileSystem struct {
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api *API
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}
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func NewFileSystem(api *API) *FileSystem {
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return &FileSystem{api}
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}
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// Upload replicates a local directory as a manifest file and uploads it
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// using FileStore store
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// This function waits the chunks to be stored.
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// TODO: localpath should point to a manifest
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//
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// DEPRECATED: Use the HTTP API instead
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func (fs *FileSystem) Upload(lpath, index string, toEncrypt bool) (string, error) {
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var list []*manifestTrieEntry
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localpath, err := filepath.Abs(filepath.Clean(lpath))
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if err != nil {
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return "", err
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}
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f, err := os.Open(localpath)
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if err != nil {
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return "", err
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}
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stat, err := f.Stat()
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if err != nil {
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return "", err
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}
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var start int
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if stat.IsDir() {
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start = len(localpath)
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log.Debug(fmt.Sprintf("uploading '%s'", localpath))
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err = filepath.Walk(localpath, func(path string, info os.FileInfo, err error) error {
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if (err == nil) && !info.IsDir() {
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if len(path) <= start {
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return fmt.Errorf("Path is too short")
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}
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if path[:start] != localpath {
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return fmt.Errorf("Path prefix of '%s' does not match localpath '%s'", path, localpath)
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}
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entry := newManifestTrieEntry(&ManifestEntry{Path: filepath.ToSlash(path)}, nil)
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list = append(list, entry)
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}
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return err
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})
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if err != nil {
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return "", err
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}
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} else {
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dir := filepath.Dir(localpath)
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start = len(dir)
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if len(localpath) <= start {
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return "", fmt.Errorf("Path is too short")
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}
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if localpath[:start] != dir {
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return "", fmt.Errorf("Path prefix of '%s' does not match dir '%s'", localpath, dir)
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}
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entry := newManifestTrieEntry(&ManifestEntry{Path: filepath.ToSlash(localpath)}, nil)
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list = append(list, entry)
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}
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errors := make([]error, len(list))
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sem := make(chan bool, maxParallelFiles)
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defer close(sem)
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for i, entry := range list {
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sem <- true
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go func(i int, entry *manifestTrieEntry) {
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defer func() { <-sem }()
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f, err := os.Open(entry.Path)
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if err != nil {
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errors[i] = err
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return
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}
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defer f.Close()
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stat, err := f.Stat()
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if err != nil {
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errors[i] = err
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return
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}
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var hash storage.Address
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var wait func(context.Context) error
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ctx := context.TODO()
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hash, wait, err = fs.api.fileStore.Store(ctx, f, stat.Size(), toEncrypt)
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if err != nil {
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errors[i] = err
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return
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}
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if hash != nil {
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list[i].Hash = hash.Hex()
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}
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if err := wait(ctx); err != nil {
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errors[i] = err
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return
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}
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list[i].ContentType, err = DetectContentType(f.Name(), f)
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if err != nil {
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errors[i] = err
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return
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}
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}(i, entry)
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}
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for i := 0; i < cap(sem); i++ {
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sem <- true
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}
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trie := &manifestTrie{
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fileStore: fs.api.fileStore,
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}
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quitC := make(chan bool)
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for i, entry := range list {
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if errors[i] != nil {
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return "", errors[i]
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}
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entry.Path = RegularSlashes(entry.Path[start:])
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if entry.Path == index {
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ientry := newManifestTrieEntry(&ManifestEntry{
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ContentType: entry.ContentType,
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}, nil)
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ientry.Hash = entry.Hash
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trie.addEntry(ientry, quitC)
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}
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trie.addEntry(entry, quitC)
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}
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err2 := trie.recalcAndStore()
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var hs string
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if err2 == nil {
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hs = trie.ref.Hex()
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}
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return hs, err2
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}
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// Download replicates the manifest basePath structure on the local filesystem
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// under localpath
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//
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// DEPRECATED: Use the HTTP API instead
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func (fs *FileSystem) Download(bzzpath, localpath string) error {
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lpath, err := filepath.Abs(filepath.Clean(localpath))
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if err != nil {
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return err
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}
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err = os.MkdirAll(lpath, os.ModePerm)
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if err != nil {
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return err
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}
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//resolving host and port
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uri, err := Parse(path.Join("bzz:/", bzzpath))
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if err != nil {
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return err
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}
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addr, err := fs.api.Resolve(context.TODO(), uri.Addr)
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if err != nil {
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return err
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}
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path := uri.Path
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if len(path) > 0 {
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path += "/"
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}
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quitC := make(chan bool)
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trie, err := loadManifest(context.TODO(), fs.api.fileStore, addr, quitC, NOOPDecrypt)
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if err != nil {
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log.Warn(fmt.Sprintf("fs.Download: loadManifestTrie error: %v", err))
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return err
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}
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type downloadListEntry struct {
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addr storage.Address
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path string
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}
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var list []*downloadListEntry
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var mde error
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prevPath := lpath
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err = trie.listWithPrefix(path, quitC, func(entry *manifestTrieEntry, suffix string) {
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log.Trace(fmt.Sprintf("fs.Download: %#v", entry))
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addr = common.Hex2Bytes(entry.Hash)
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path := lpath + "/" + suffix
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dir := filepath.Dir(path)
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if dir != prevPath {
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mde = os.MkdirAll(dir, os.ModePerm)
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prevPath = dir
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}
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if (mde == nil) && (path != dir+"/") {
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list = append(list, &downloadListEntry{addr: addr, path: path})
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}
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})
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if err != nil {
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return err
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}
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wg := sync.WaitGroup{}
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errC := make(chan error)
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done := make(chan bool, maxParallelFiles)
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for i, entry := range list {
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select {
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case done <- true:
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wg.Add(1)
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case <-quitC:
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return fmt.Errorf("aborted")
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}
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go func(i int, entry *downloadListEntry) {
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defer wg.Done()
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err := retrieveToFile(quitC, fs.api.fileStore, entry.addr, entry.path)
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if err != nil {
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select {
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case errC <- err:
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case <-quitC:
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}
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return
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}
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<-done
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}(i, entry)
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}
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go func() {
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wg.Wait()
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close(errC)
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}()
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select {
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case err = <-errC:
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return err
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case <-quitC:
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return fmt.Errorf("aborted")
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}
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}
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func retrieveToFile(quitC chan bool, fileStore *storage.FileStore, addr storage.Address, path string) error {
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f, err := os.Create(path) // TODO: basePath separators
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if err != nil {
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return err
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}
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reader, _ := fileStore.Retrieve(context.TODO(), addr)
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writer := bufio.NewWriter(f)
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size, err := reader.Size(context.TODO(), quitC)
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if err != nil {
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return err
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}
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if _, err = io.CopyN(writer, reader, size); err != nil {
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return err
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}
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if err := writer.Flush(); err != nil {
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return err
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}
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return f.Close()
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}
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