package eth
import (
"encoding/json"
"net"
"path"
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"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/rpc"
"github.com/ethereum/go-ethereum/state"
)
const (
seedNodeAddress = "poc-7.ethdev.com:30300"
)
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
// State manager for processing new blocks and managing the over all states
blockManager *core.BlockManager
// The transaction pool. Transaction can be pushed on this pool
// for later including in the blocks
txPool *core.TxPool
// The canonical chain
chainManager *core.ChainManager
// The block pool
blockPool *BlockPool
// Event
eventMux *event.TypeMux
// Nonce
Nonce uint64
ListenAddr string
blacklist p2p.Blacklist
server *p2p.Server
txSub event.Subscription
blockSub event.Subscription
// Capabilities for outgoing peers
// serverCaps Caps
peersFile string
Mining bool
RpcServer *rpc.JsonRpcServer
keyManager *crypto.KeyManager
clientIdentity p2p.ClientIdentity
synclock sync.Mutex
syncGroup sync.WaitGroup
filterMu sync.RWMutex
filterId int
filters map[int]*core.Filter
}
func New(db ethutil.Database, identity p2p.ClientIdentity, keyManager *crypto.KeyManager, nat p2p.NAT, port string, maxPeers int) (*Ethereum, error) {
saveProtocolVersion(db)
ethutil.Config.Db = db
// FIXME:
blacklist := p2p.NewBlacklist()
// Sorry Py person. I must blacklist. you perform badly
blacklist.Put(ethutil.Hex2Bytes("64656330303561383532336435376331616537643864663236623336313863373537353163636634333530626263396330346237336262623931383064393031"))
peersFile := path.Join(ethutil.Config.ExecPath, "known_peers.json")
nonce, _ := ethutil.RandomUint64()
listenAddr := ":" + port
eth := &Ethereum{
shutdownChan: make(chan bool),
quit: make(chan bool),
db: db,
Nonce: nonce,
// serverCaps: caps,
peersFile: peersFile,
ListenAddr: listenAddr,
keyManager: keyManager,
clientIdentity: identity,
blacklist: blacklist,
eventMux: &event.TypeMux{},
filters: make(map[int]*core.Filter),
}
eth.txPool = core.NewTxPool(eth)
eth.chainManager = core.NewChainManager(eth.EventMux())
eth.blockManager = core.NewBlockManager(eth)
eth.chainManager.SetProcessor(eth.blockManager)
hasBlock := eth.chainManager.HasBlock
insertChain := eth.chainManager.InsertChain
// pow := ezp.New()
// verifyPoW := pow.Verify
verifyPoW := func(*types.Block) bool { return true }
eth.blockPool = NewBlockPool(hasBlock, insertChain, verifyPoW)
// Start the tx pool
eth.txPool.Start()
ethProto := EthProtocol(eth.txPool, eth.chainManager, eth.blockPool)
protocols := []p2p.Protocol{ethProto}
server := &p2p.Server{
Identity: identity,
MaxPeers: maxPeers,
Protocols: protocols,
ListenAddr: listenAddr,
Blacklist: blacklist,
NAT: nat,
}
eth.server = server
return eth, nil
}
func (s *Ethereum) KeyManager() *crypto.KeyManager {
return s.keyManager
}
func (s *Ethereum) ClientIdentity() p2p.ClientIdentity {
return s.clientIdentity
}
func (s *Ethereum) ChainManager() *core.ChainManager {
return s.chainManager
}
func (s *Ethereum) BlockManager() *core.BlockManager {
return s.blockManager
}
func (s *Ethereum) TxPool() *core.TxPool {
return s.txPool
}
func (s *Ethereum) BlockPool() *BlockPool {
return s.blockPool
}
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 {
if s.ListenAddr == "" {
return false
} else {
return true
}
}
func (s *Ethereum) PeerCount() int {
return s.server.PeerCount()
}
func (s *Ethereum) Peers() []*p2p.Peer {
return s.server.Peers()
}
// Start the ethereum
func (s *Ethereum) Start(seed bool) error {
err := s.server.Start()
if err != nil {
return err
}
s.blockPool.Start()
s.blockManager.Start()
go s.filterLoop()
// 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.server.SuggestPeer(netaddr.IP, netaddr.Port, nil)
return nil
}
func (s *Ethereum) Stop() {
// Close the database
defer s.db.Close()
//
// WritePeers(s.peersFile, s.server.PeerAddresses())
close(s.quit)
s.txSub.Unsubscribe() // quits txBroadcastLoop
s.blockSub.Unsubscribe() // quits blockBroadcastLoop
if s.RpcServer != nil {
s.RpcServer.Stop()
}
s.txPool.Stop()
s.blockManager.Stop()
s.eventMux.Stop()
s.blockPool.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
}
func WritePeers(path string, addresses []string) {
if len(addresses) > 0 {
data, _ := json.MarshalIndent(addresses, "", " ")
ethutil.WriteFile(path, data)
}
}
func ReadPeers(path string) (ips []string, err error) {
var data string
data, err = ethutil.ReadAllFile(path)
if err != nil {
json.Unmarshal([]byte(data), &ips)
}
return
}
// 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.server.Broadcast("eth", TxMsg, []interface{}{event.Tx.RlpData()})
}
}
func (self *Ethereum) blockBroadcastLoop() {
// automatically stops if unsubscribe
for obj := range self.txSub.Chan() {
event := obj.(core.NewMinedBlockEvent)
self.server.Broadcast("eth", NewBlockMsg, event.Block.Value().Val)
}
}
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())
}
}
// InstallFilter adds filter for blockchain events.
// The filter's callbacks will run for matching blocks and messages.
// The filter should not be modified after it has been installed.
func (self *Ethereum) InstallFilter(filter *core.Filter) (id int) {
self.filterMu.Lock()
id = self.filterId
self.filters[id] = filter
self.filterId++
self.filterMu.Unlock()
return id
}
func (self *Ethereum) UninstallFilter(id int) {
self.filterMu.Lock()
delete(self.filters, id)
self.filterMu.Unlock()
}
// GetFilter retrieves a filter installed using InstallFilter.
// The filter may not be modified.
func (self *Ethereum) GetFilter(id int) *core.Filter {
self.filterMu.RLock()
defer self.filterMu.RUnlock()
return self.filters[id]
}
func (self *Ethereum) filterLoop() {
// Subscribe to events
events := self.eventMux.Subscribe(core.NewBlockEvent{}, state.Messages(nil))
for event := range events.Chan() {
switch event.(type) {
case core.NewBlockEvent:
self.filterMu.RLock()
for _, filter := range self.filters {
if filter.BlockCallback != nil {
e := event.(core.NewBlockEvent)
filter.BlockCallback(e.Block)
}
}
self.filterMu.RUnlock()
case state.Messages:
self.filterMu.RLock()
for _, filter := range self.filters {
if filter.MessageCallback != nil {
e := event.(state.Messages)
msgs := filter.FilterMessages(e)
if len(msgs) > 0 {
filter.MessageCallback(msgs)
}
}
}
self.filterMu.RUnlock()
}
}
}
