mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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205 lines
5.5 KiB
Go
205 lines
5.5 KiB
Go
// 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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"fmt"
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"io"
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"net/http"
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"regexp"
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"strings"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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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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)
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var (
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hashMatcher = regexp.MustCompile("^[0-9A-Fa-f]{64}")
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slashes = regexp.MustCompile("/+")
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domainAndVersion = regexp.MustCompile("[@:;,]+")
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)
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type Resolver interface {
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Resolve(string) (common.Hash, error)
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}
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/*
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Api implements webserver/file system related content storage and retrieval
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on top of the dpa
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it is the public interface of the dpa which is included in the ethereum stack
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*/
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type Api struct {
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dpa *storage.DPA
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dns Resolver
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}
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//the api constructor initialises
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func NewApi(dpa *storage.DPA, dns Resolver) (self *Api) {
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self = &Api{
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dpa: dpa,
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dns: dns,
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}
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return
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}
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// DPA reader API
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func (self *Api) Retrieve(key storage.Key) storage.LazySectionReader {
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return self.dpa.Retrieve(key)
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}
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func (self *Api) Store(data io.Reader, size int64, wg *sync.WaitGroup) (key storage.Key, err error) {
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return self.dpa.Store(data, size, wg, nil)
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}
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type ErrResolve error
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// DNS Resolver
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func (self *Api) Resolve(hostPort string, nameresolver bool) (storage.Key, error) {
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log.Trace(fmt.Sprintf("Resolving : %v", hostPort))
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if hashMatcher.MatchString(hostPort) || self.dns == nil {
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log.Trace(fmt.Sprintf("host is a contentHash: '%v'", hostPort))
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return storage.Key(common.Hex2Bytes(hostPort)), nil
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}
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if !nameresolver {
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return nil, fmt.Errorf("'%s' is not a content hash value.", hostPort)
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}
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contentHash, err := self.dns.Resolve(hostPort)
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if err != nil {
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err = ErrResolve(err)
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log.Warn(fmt.Sprintf("DNS error : %v", err))
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}
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log.Trace(fmt.Sprintf("host lookup: %v -> %v", hostPort, contentHash))
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return contentHash[:], err
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}
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func Parse(uri string) (hostPort, path string) {
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if uri == "" {
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return
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}
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parts := slashes.Split(uri, 3)
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var i int
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if len(parts) == 0 {
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return
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}
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// beginning with slash is now optional
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for len(parts[i]) == 0 {
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i++
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}
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hostPort = parts[i]
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for i < len(parts)-1 {
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i++
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if len(path) > 0 {
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path = path + "/" + parts[i]
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} else {
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path = parts[i]
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}
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}
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log.Debug(fmt.Sprintf("host: '%s', path '%s' requested.", hostPort, path))
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return
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}
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func (self *Api) parseAndResolve(uri string, nameresolver bool) (key storage.Key, hostPort, path string, err error) {
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hostPort, path = Parse(uri)
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//resolving host and port
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contentHash, err := self.Resolve(hostPort, nameresolver)
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log.Debug(fmt.Sprintf("Resolved '%s' to contentHash: '%s', path: '%s'", uri, contentHash, path))
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return contentHash[:], hostPort, path, err
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}
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// Put provides singleton manifest creation on top of dpa store
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func (self *Api) Put(content, contentType string) (string, error) {
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r := strings.NewReader(content)
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wg := &sync.WaitGroup{}
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key, err := self.dpa.Store(r, int64(len(content)), wg, nil)
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if err != nil {
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return "", err
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}
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manifest := fmt.Sprintf(`{"entries":[{"hash":"%v","contentType":"%s"}]}`, key, contentType)
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r = strings.NewReader(manifest)
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key, err = self.dpa.Store(r, int64(len(manifest)), wg, nil)
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if err != nil {
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return "", err
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}
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wg.Wait()
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return key.String(), nil
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}
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// Get uses iterative manifest retrieval and prefix matching
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// to resolve path to content using dpa retrieve
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// it returns a section reader, mimeType, status and an error
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func (self *Api) Get(uri string, nameresolver bool) (reader storage.LazySectionReader, mimeType string, status int, err error) {
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key, _, path, err := self.parseAndResolve(uri, nameresolver)
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if err != nil {
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return nil, "", 500, fmt.Errorf("can't resolve: %v", err)
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}
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quitC := make(chan bool)
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trie, err := loadManifest(self.dpa, key, quitC)
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if err != nil {
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log.Warn(fmt.Sprintf("loadManifestTrie error: %v", err))
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return
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}
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log.Trace(fmt.Sprintf("getEntry(%s)", path))
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entry, _ := trie.getEntry(path)
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if entry != nil {
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key = common.Hex2Bytes(entry.Hash)
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status = entry.Status
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mimeType = entry.ContentType
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log.Trace(fmt.Sprintf("content lookup key: '%v' (%v)", key, mimeType))
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reader = self.dpa.Retrieve(key)
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} else {
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status = http.StatusNotFound
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err = fmt.Errorf("manifest entry for '%s' not found", path)
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log.Warn(fmt.Sprintf("%v", err))
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}
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return
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}
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func (self *Api) Modify(uri, contentHash, contentType string, nameresolver bool) (newRootHash string, err error) {
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root, _, path, err := self.parseAndResolve(uri, nameresolver)
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if err != nil {
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return "", fmt.Errorf("can't resolve: %v", err)
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}
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quitC := make(chan bool)
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trie, err := loadManifest(self.dpa, root, quitC)
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if err != nil {
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return
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}
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if contentHash != "" {
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entry := &manifestTrieEntry{
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Path: path,
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Hash: contentHash,
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ContentType: contentType,
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}
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trie.addEntry(entry, quitC)
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} else {
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trie.deleteEntry(path, quitC)
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}
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err = trie.recalcAndStore()
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if err != nil {
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return
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}
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return trie.hash.String(), nil
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}
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