swarm: plan bee for content storage and distribution on web3
This change imports the Swarm protocol codebase. Compared to the 'swarm' branch, a few mostly cosmetic changes had to be made: * The various redundant log message prefixes are gone. * All files now have LGPLv3 license headers. * Minor code changes were needed to please go vet and make the tests pass on Windows. * Further changes were required to adapt to the go-ethereum develop branch and its new Go APIs. Some code has not (yet) been brought over: * swarm/cmd/bzzhash: will reappear as cmd/bzzhash later * swarm/cmd/bzzup.sh: will be reimplemented in cmd/bzzup * swarm/cmd/makegenesis: will reappear somehow * swarm/examples/album: will move to a separate repository * swarm/examples/filemanager: ditto * swarm/examples/files: will not be merged * swarm/test/*: will not be merged * swarm/services/swear: will reappear as contracts/swear when needed
This commit is contained in:
ΞTHΞЯSPHΞЯΞ
Felix Lange
191
swarm/api/api.go
Normal file
191
swarm/api/api.go
Normal file
@ -0,0 +1,191 @@
|
||||
// Copyright 2016 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package api
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"regexp"
|
||||
"strings"
|
||||
"sync"
|
||||
|
||||
"github.com/ethereum/go-ethereum/common"
|
||||
"github.com/ethereum/go-ethereum/logger"
|
||||
"github.com/ethereum/go-ethereum/logger/glog"
|
||||
"github.com/ethereum/go-ethereum/swarm/storage"
|
||||
)
|
||||
|
||||
var (
|
||||
hashMatcher = regexp.MustCompile("^[0-9A-Fa-f]{64}")
|
||||
slashes = regexp.MustCompile("/+")
|
||||
domainAndVersion = regexp.MustCompile("[@:;,]+")
|
||||
)
|
||||
|
||||
type Resolver interface {
|
||||
Resolve(string) (common.Hash, error)
|
||||
}
|
||||
|
||||
/*
|
||||
Api implements webserver/file system related content storage and retrieval
|
||||
on top of the dpa
|
||||
it is the public interface of the dpa which is included in the ethereum stack
|
||||
*/
|
||||
type Api struct {
|
||||
dpa *storage.DPA
|
||||
dns Resolver
|
||||
}
|
||||
|
||||
//the api constructor initialises
|
||||
func NewApi(dpa *storage.DPA, dns Resolver) (self *Api) {
|
||||
self = &Api{
|
||||
dpa: dpa,
|
||||
dns: dns,
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// DPA reader API
|
||||
func (self *Api) Retrieve(key storage.Key) storage.LazySectionReader {
|
||||
return self.dpa.Retrieve(key)
|
||||
}
|
||||
|
||||
func (self *Api) Store(data io.Reader, size int64, wg *sync.WaitGroup) (key storage.Key, err error) {
|
||||
return self.dpa.Store(data, size, wg, nil)
|
||||
}
|
||||
|
||||
type ErrResolve error
|
||||
|
||||
// DNS Resolver
|
||||
func (self *Api) Resolve(hostPort string, nameresolver bool) (storage.Key, error) {
|
||||
if hashMatcher.MatchString(hostPort) || self.dns == nil {
|
||||
glog.V(logger.Detail).Infof("host is a contentHash: '%v'", hostPort)
|
||||
return storage.Key(common.Hex2Bytes(hostPort)), nil
|
||||
}
|
||||
if !nameresolver {
|
||||
return nil, fmt.Errorf("'%s' is not a content hash value.", hostPort)
|
||||
}
|
||||
contentHash, err := self.dns.Resolve(hostPort)
|
||||
if err != nil {
|
||||
err = ErrResolve(err)
|
||||
glog.V(logger.Warn).Infof("DNS error : %v", err)
|
||||
}
|
||||
glog.V(logger.Detail).Infof("host lookup: %v -> %v", err)
|
||||
return contentHash[:], err
|
||||
}
|
||||
|
||||
func parse(uri string) (hostPort, path string) {
|
||||
parts := slashes.Split(uri, 3)
|
||||
var i int
|
||||
if len(parts) == 0 {
|
||||
return
|
||||
}
|
||||
// beginning with slash is now optional
|
||||
for len(parts[i]) == 0 {
|
||||
i++
|
||||
}
|
||||
hostPort = parts[i]
|
||||
for i < len(parts)-1 {
|
||||
i++
|
||||
if len(path) > 0 {
|
||||
path = path + "/" + parts[i]
|
||||
} else {
|
||||
path = parts[i]
|
||||
}
|
||||
}
|
||||
glog.V(logger.Debug).Infof("host: '%s', path '%s' requested.", hostPort, path)
|
||||
return
|
||||
}
|
||||
|
||||
func (self *Api) parseAndResolve(uri string, nameresolver bool) (key storage.Key, hostPort, path string, err error) {
|
||||
hostPort, path = parse(uri)
|
||||
//resolving host and port
|
||||
contentHash, err := self.Resolve(hostPort, nameresolver)
|
||||
glog.V(logger.Debug).Infof("Resolved '%s' to contentHash: '%s', path: '%s'", uri, contentHash, path)
|
||||
return contentHash[:], hostPort, path, err
|
||||
}
|
||||
|
||||
// Put provides singleton manifest creation on top of dpa store
|
||||
func (self *Api) Put(content, contentType string) (string, error) {
|
||||
r := strings.NewReader(content)
|
||||
wg := &sync.WaitGroup{}
|
||||
key, err := self.dpa.Store(r, int64(len(content)), wg, nil)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
manifest := fmt.Sprintf(`{"entries":[{"hash":"%v","contentType":"%s"}]}`, key, contentType)
|
||||
r = strings.NewReader(manifest)
|
||||
key, err = self.dpa.Store(r, int64(len(manifest)), wg, nil)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
wg.Wait()
|
||||
return key.String(), nil
|
||||
}
|
||||
|
||||
// Get uses iterative manifest retrieval and prefix matching
|
||||
// to resolve path to content using dpa retrieve
|
||||
// it returns a section reader, mimeType, status and an error
|
||||
func (self *Api) Get(uri string, nameresolver bool) (reader storage.LazySectionReader, mimeType string, status int, err error) {
|
||||
|
||||
key, _, path, err := self.parseAndResolve(uri, nameresolver)
|
||||
quitC := make(chan bool)
|
||||
trie, err := loadManifest(self.dpa, key, quitC)
|
||||
if err != nil {
|
||||
glog.V(logger.Warn).Infof("loadManifestTrie error: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
glog.V(logger.Detail).Infof("getEntry(%s)", path)
|
||||
entry, _ := trie.getEntry(path)
|
||||
if entry != nil {
|
||||
key = common.Hex2Bytes(entry.Hash)
|
||||
status = entry.Status
|
||||
mimeType = entry.ContentType
|
||||
glog.V(logger.Detail).Infof("content lookup key: '%v' (%v)", key, mimeType)
|
||||
reader = self.dpa.Retrieve(key)
|
||||
} else {
|
||||
err = fmt.Errorf("manifest entry for '%s' not found", path)
|
||||
glog.V(logger.Warn).Infof("%v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (self *Api) Modify(uri, contentHash, contentType string, nameresolver bool) (newRootHash string, err error) {
|
||||
root, _, path, err := self.parseAndResolve(uri, nameresolver)
|
||||
quitC := make(chan bool)
|
||||
trie, err := loadManifest(self.dpa, root, quitC)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
if contentHash != "" {
|
||||
entry := &manifestTrieEntry{
|
||||
Path: path,
|
||||
Hash: contentHash,
|
||||
ContentType: contentType,
|
||||
}
|
||||
trie.addEntry(entry, quitC)
|
||||
} else {
|
||||
trie.deleteEntry(path, quitC)
|
||||
}
|
||||
|
||||
err = trie.recalcAndStore()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
return trie.hash.String(), nil
|
||||
}
|
||||
Reference in New Issue
Block a user