package eth
import (
"fmt"
"net"
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/event"
ethlogger "github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/pow/ezp"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/whisper"
)
const (
seedNodeAddress = "poc-8.ethdev.com:30303"
)
type Config struct {
Name string
Version string
Identifier string
KeyStore string
DataDir string
LogFile string
LogLevel int
KeyRing string
MaxPeers int
Port string
NATType string
PMPGateway string
Shh bool
Dial bool
KeyManager *crypto.KeyManager
}
var logger = ethlogger.NewLogger("SERV")
type Ethereum struct {
// Channel for shutting down the ethereum
shutdownChan chan bool
quit chan bool
// DB interface
db ethutil.Database
blacklist p2p.Blacklist
//*** SERVICES ***
// State manager for processing new blocks and managing the over all states
blockProcessor *core.BlockProcessor
txPool *core.TxPool
chainManager *core.ChainManager
blockPool *BlockPool
whisper *whisper.Whisper
net *p2p.Server
eventMux *event.TypeMux
txSub event.Subscription
blockSub event.Subscription
RpcServer *rpc.JsonRpcServer
keyManager *crypto.KeyManager
clientIdentity p2p.ClientIdentity
logger ethlogger.LogSystem
synclock sync.Mutex
syncGroup sync.WaitGroup
Mining bool
}
func New(config *Config) (*Ethereum, error) {
// Boostrap database
logger := ethlogger.New(config.DataDir, config.LogFile, config.LogLevel)
db, err := ethdb.NewLDBDatabase("blockchain")
if err != nil {
return nil, err
}
// Perform database sanity checks
d, _ := db.Get([]byte("ProtocolVersion"))
protov := ethutil.NewValue(d).Uint()
if protov != ProtocolVersion && protov != 0 {
return nil, fmt.Errorf("Database version mismatch. Protocol(%d / %d). `rm -rf %s`", protov, ProtocolVersion, ethutil.Config.ExecPath+"/database")
}
// Create new keymanager
var keyManager *crypto.KeyManager
switch config.KeyStore {
case "db":
keyManager = crypto.NewDBKeyManager(db)
case "file":
keyManager = crypto.NewFileKeyManager(config.DataDir)
default:
return nil, fmt.Errorf("unknown keystore type: %s", config.KeyStore)
}
// Initialise the keyring
keyManager.Init(config.KeyRing, 0, false)
// Create a new client id for this instance. This will help identifying the node on the network
clientId := p2p.NewSimpleClientIdentity(config.Name, config.Version, config.Identifier, keyManager.PublicKey())
saveProtocolVersion(db)
//ethutil.Config.Db = db
eth := &Ethereum{
shutdownChan: make(chan bool),
quit: make(chan bool),
db: db,
keyManager: keyManager,
clientIdentity: clientId,
blacklist: p2p.NewBlacklist(),
eventMux: &event.TypeMux{},
logger: logger,
}
eth.chainManager = core.NewChainManager(db, eth.EventMux())
eth.txPool = core.NewTxPool(eth.EventMux())
eth.blockProcessor = core.NewBlockProcessor(db, eth.txPool, eth.chainManager, eth.EventMux())
eth.chainManager.SetProcessor(eth.blockProcessor)
eth.whisper = whisper.New()
hasBlock := eth.chainManager.HasBlock
insertChain := eth.chainManager.InsertChain
eth.blockPool = NewBlockPool(hasBlock, insertChain, ezp.Verify)
ethProto := EthProtocol(eth.txPool, eth.chainManager, eth.blockPool)
protocols := []p2p.Protocol{ethProto, eth.whisper.Protocol()}
nat, err := p2p.ParseNAT(config.NATType, config.PMPGateway)
if err != nil {
return nil, err
}
fmt.Println(nat)
eth.net = &p2p.Server{
Identity: clientId,
MaxPeers: config.MaxPeers,
Protocols: protocols,
Blacklist: eth.blacklist,
NAT: p2p.UPNP(),
NoDial: !config.Dial,
}
if len(config.Port) > 0 {
eth.net.ListenAddr = ":" + config.Port
}
return eth, nil
}
func (s *Ethereum) KeyManager() *crypto.KeyManager {
return s.keyManager
}
func (s *Ethereum) Logger() ethlogger.LogSystem {
return s.logger
}
func (s *Ethereum) ClientIdentity() p2p.ClientIdentity {
return s.clientIdentity
}
func (s *Ethereum) ChainManager() *core.ChainManager {
return s.chainManager
}
func (s *Ethereum) BlockProcessor() *core.BlockProcessor {
return s.blockProcessor
}
func (s *Ethereum) TxPool() *core.TxPool {
return s.txPool
}
func (s *Ethereum) BlockPool() *BlockPool {
return s.blockPool
}
func (s *Ethereum) Whisper() *whisper.Whisper {
return s.whisper
}
func (s *Ethereum) EventMux() *event.TypeMux {
return s.eventMux
}
func (self *Ethereum) Db() ethutil.Database {
return self.db
}
func (s *Ethereum) IsMining() bool {
return s.Mining
}
func (s *Ethereum) IsListening() bool {
// XXX TODO
return false
}
func (s *Ethereum) PeerCount() int {
return s.net.PeerCount()
}
func (s *Ethereum) Peers() []*p2p.Peer {
return s.net.Peers()
}
func (s *Ethereum) MaxPeers() int {
return s.net.MaxPeers
}
// Start the ethereum
func (s *Ethereum) Start(seed bool) error {
err := s.net.Start()
if err != nil {
return err
}
// Start services
s.txPool.Start()
s.blockPool.Start()
if s.whisper != nil {
s.whisper.Start()
}
// broadcast transactions
s.txSub = s.eventMux.Subscribe(core.TxPreEvent{})
go s.txBroadcastLoop()
// broadcast mined blocks
s.blockSub = s.eventMux.Subscribe(core.NewMinedBlockEvent{})
go s.blockBroadcastLoop()
// TODO: read peers here
if seed {
logger.Infof("Connect to seed node %v", seedNodeAddress)
if err := s.SuggestPeer(seedNodeAddress); err != nil {
return err
}
}
logger.Infoln("Server started")
return nil
}
func (self *Ethereum) SuggestPeer(addr string) error {
netaddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
logger.Errorf("couldn't resolve %s:", addr, err)
return err
}
self.net.SuggestPeer(netaddr.IP, netaddr.Port, nil)
return nil
}
func (s *Ethereum) Stop() {
// Close the database
defer s.db.Close()
close(s.quit)
s.txSub.Unsubscribe() // quits txBroadcastLoop
s.blockSub.Unsubscribe() // quits blockBroadcastLoop
if s.RpcServer != nil {
s.RpcServer.Stop()
}
s.txPool.Stop()
s.eventMux.Stop()
s.blockPool.Stop()
if s.whisper != nil {
s.whisper.Stop()
}
logger.Infoln("Server stopped")
close(s.shutdownChan)
}
// This function will wait for a shutdown and resumes main thread execution
func (s *Ethereum) WaitForShutdown() {
<-s.shutdownChan
}
// now tx broadcasting is taken out of txPool
// handled here via subscription, efficiency?
func (self *Ethereum) txBroadcastLoop() {
// automatically stops if unsubscribe
for obj := range self.txSub.Chan() {
event := obj.(core.TxPreEvent)
self.net.Broadcast("eth", TxMsg, event.Tx.RlpData())
}
}
func (self *Ethereum) blockBroadcastLoop() {
// automatically stops if unsubscribe
for obj := range self.blockSub.Chan() {
switch ev := obj.(type) {
case core.NewMinedBlockEvent:
self.net.Broadcast("eth", NewBlockMsg, ev.Block.RlpData(), ev.Block.Td)
}
}
}
func saveProtocolVersion(db ethutil.Database) {
d, _ := db.Get([]byte("ProtocolVersion"))
protocolVersion := ethutil.NewValue(d).Uint()
if protocolVersion == 0 {
db.Put([]byte("ProtocolVersion"), ethutil.NewValue(ProtocolVersion).Bytes())
}
}
