// 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 swarm
import (
"bytes"
"crypto/ecdsa"
"fmt"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/contracts/chequebook"
"github.com/ethereum/go-ethereum/contracts/ens"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/swarm/api"
httpapi "github.com/ethereum/go-ethereum/swarm/api/http"
"github.com/ethereum/go-ethereum/swarm/network"
"github.com/ethereum/go-ethereum/swarm/storage"
"golang.org/x/net/context"
)
// the swarm stack
type Swarm struct {
config *api.Config // swarm configuration
api *api.Api // high level api layer (fs/manifest)
dns api.Resolver // DNS registrar
dbAccess *network.DbAccess // access to local chunk db iterator and storage counter
storage storage.ChunkStore // internal access to storage, common interface to cloud storage backends
dpa *storage.DPA // distributed preimage archive, the local API to the storage with document level storage/retrieval support
depo network.StorageHandler // remote request handler, interface between bzz protocol and the storage
cloud storage.CloudStore // procurement, cloud storage backend (can multi-cloud)
hive *network.Hive // the logistic manager
backend chequebook.Backend // simple blockchain Backend
privateKey *ecdsa.PrivateKey
corsString string
swapEnabled bool
}
type SwarmAPI struct {
Api *api.Api
Backend chequebook.Backend
PrvKey *ecdsa.PrivateKey
}
func (self *Swarm) API() *SwarmAPI {
return &SwarmAPI{
Api: self.api,
Backend: self.backend,
PrvKey: self.privateKey,
}
}
// creates a new swarm service instance
// implements node.Service
func NewSwarm(ctx *node.ServiceContext, backend chequebook.Backend, config *api.Config, swapEnabled, syncEnabled bool, cors string) (self *Swarm, err error) {
if bytes.Equal(common.FromHex(config.PublicKey), storage.ZeroKey) {
return nil, fmt.Errorf("empty public key")
}
if bytes.Equal(common.FromHex(config.BzzKey), storage.ZeroKey) {
return nil, fmt.Errorf("empty bzz key")
}
self = &Swarm{
config: config,
swapEnabled: swapEnabled,
backend: backend,
privateKey: config.Swap.PrivateKey(),
corsString: cors,
}
glog.V(logger.Debug).Infof("Setting up Swarm service components")
hash := storage.MakeHashFunc(config.ChunkerParams.Hash)
lstore, err := storage.NewLocalStore(hash, config.StoreParams)
if err != nil {
return
}
// setup local store
glog.V(logger.Debug).Infof("Set up local storage")
self.dbAccess = network.NewDbAccess(lstore)
glog.V(logger.Debug).Infof("Set up local db access (iterator/counter)")
// set up the kademlia hive
self.hive = network.NewHive(
common.HexToHash(self.config.BzzKey), // key to hive (kademlia base address)
config.HiveParams, // configuration parameters
swapEnabled, // SWAP enabled
syncEnabled, // syncronisation enabled
)
glog.V(logger.Debug).Infof("Set up swarm network with Kademlia hive")
// setup cloud storage backend
cloud := network.NewForwarder(self.hive)
glog.V(logger.Debug).Infof("-> set swarm forwarder as cloud storage backend")
// setup cloud storage internal access layer
self.storage = storage.NewNetStore(hash, lstore, cloud, config.StoreParams)
glog.V(logger.Debug).Infof("-> swarm net store shared access layer to Swarm Chunk Store")
// set up Depo (storage handler = cloud storage access layer for incoming remote requests)
self.depo = network.NewDepo(hash, lstore, self.storage)
glog.V(logger.Debug).Infof("-> REmote Access to CHunks")
// set up DPA, the cloud storage local access layer
dpaChunkStore := storage.NewDpaChunkStore(lstore, self.storage)
glog.V(logger.Debug).Infof("-> Local Access to Swarm")
// Swarm Hash Merklised Chunking for Arbitrary-length Document/File storage
self.dpa = storage.NewDPA(dpaChunkStore, self.config.ChunkerParams)
glog.V(logger.Debug).Infof("-> Content Store API")
// set up high level api
transactOpts := bind.NewKeyedTransactor(self.privateKey)
self.dns, err = ens.NewENS(transactOpts, config.EnsRoot, self.backend)
if err != nil {
return nil, err
}
glog.V(logger.Debug).Infof("-> Swarm Domain Name Registrar @ address %v", config.EnsRoot.Hex())
self.api = api.NewApi(self.dpa, self.dns)
// Manifests for Smart Hosting
glog.V(logger.Debug).Infof("-> Web3 virtual server API")
return self, nil
}
/*
Start is called when the stack is started
* starts the network kademlia hive peer management
* (starts netStore level 0 api)
* starts DPA level 1 api (chunking -> store/retrieve requests)
* (starts level 2 api)
* starts http proxy server
* registers url scheme handlers for bzz, etc
* TODO: start subservices like sword, swear, swarmdns
*/
// implements the node.Service interface
func (self *Swarm) Start(net *p2p.Server) error {
connectPeer := func(url string) error {
node, err := discover.ParseNode(url)
if err != nil {
return fmt.Errorf("invalid node URL: %v", err)
}
net.AddPeer(node)
return nil
}
// set chequebook
if self.swapEnabled {
ctx := context.Background() // The initial setup has no deadline.
err := self.SetChequebook(ctx)
if err != nil {
return fmt.Errorf("Unable to set chequebook for SWAP: %v", err)
}
glog.V(logger.Debug).Infof("-> cheque book for SWAP: %v", self.config.Swap.Chequebook())
} else {
glog.V(logger.Debug).Infof("SWAP disabled: no cheque book set")
}
glog.V(logger.Warn).Infof("Starting Swarm service")
self.hive.Start(
discover.PubkeyID(&net.PrivateKey.PublicKey),
func() string { return net.ListenAddr },
connectPeer,
)
glog.V(logger.Info).Infof("Swarm network started on bzz address: %v", self.hive.Addr())
self.dpa.Start()
glog.V(logger.Debug).Infof("Swarm DPA started")
// start swarm http proxy server
if self.config.Port != "" {
addr := ":" + self.config.Port
go httpapi.StartHttpServer(self.api, &httpapi.Server{Addr: addr, CorsString: self.corsString})
}
glog.V(logger.Debug).Infof("Swarm http proxy started on port: %v", self.config.Port)
if self.corsString != "" {
glog.V(logger.Debug).Infof("Swarm http proxy started with corsdomain:", self.corsString)
}
return nil
}
// implements the node.Service interface
// stops all component services.
func (self *Swarm) Stop() error {
self.dpa.Stop()
self.hive.Stop()
if ch := self.config.Swap.Chequebook(); ch != nil {
ch.Stop()
ch.Save()
}
return self.config.Save()
}
// implements the node.Service interface
func (self *Swarm) Protocols() []p2p.Protocol {
proto, err := network.Bzz(self.depo, self.backend, self.hive, self.dbAccess, self.config.Swap, self.config.SyncParams, self.config.NetworkId)
if err != nil {
return nil
}
return []p2p.Protocol{proto}
}
// implements node.Service
// Apis returns the RPC Api descriptors the Swarm implementation offers
func (self *Swarm) APIs() []rpc.API {
return []rpc.API{
// public APIs
{
Namespace: "bzz",
Version: "0.1",
Service: api.NewStorage(self.api),
Public: true,
},
{
Namespace: "bzz",
Version: "0.1",
Service: &Info{self.config, chequebook.ContractParams},
Public: true,
},
// admin APIs
{
Namespace: "bzz",
Version: "0.1",
Service: api.NewFileSystem(self.api),
Public: false},
{
Namespace: "bzz",
Version: "0.1",
Service: api.NewControl(self.api, self.hive),
Public: false,
},
{
Namespace: "chequebook",
Version: chequebook.Version,
Service: chequebook.NewApi(self.config.Swap.Chequebook),
Public: false,
},
// {Namespace, Version, api.NewAdmin(self), false},
}
}
func (self *Swarm) Api() *api.Api {
return self.api
}
// SetChequebook ensures that the local checquebook is set up on chain.
func (self *Swarm) SetChequebook(ctx context.Context) error {
err := self.config.Swap.SetChequebook(ctx, self.backend, self.config.Path)
if err != nil {
return err
}
glog.V(logger.Info).Infof("new chequebook set (%v): saving config file, resetting all connections in the hive", self.config.Swap.Contract.Hex())
self.config.Save()
self.hive.DropAll()
return nil
}
// Local swarm without netStore
func NewLocalSwarm(datadir, port string) (self *Swarm, err error) {
prvKey, err := crypto.GenerateKey()
if err != nil {
return
}
config, err := api.NewConfig(datadir, common.Address{}, prvKey, network.NetworkId)
if err != nil {
return
}
config.Port = port
dpa, err := storage.NewLocalDPA(datadir)
if err != nil {
return
}
self = &Swarm{
api: api.NewApi(dpa, nil),
config: config,
}
return
}
// serialisable info about swarm
type Info struct {
*api.Config
*chequebook.Params
}
func (self *Info) Info() *Info {
return self
}
