From 02017ed0e019ea2692c1e184873d09f41551a0ec Mon Sep 17 00:00:00 2001 From: zelig Date: Sun, 14 Dec 2014 18:03:24 +0000 Subject: initial commit for new backend (eth.Ethereum) --- eth/backend.go | 357 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 357 insertions(+) create mode 100644 eth/backend.go (limited to 'eth/backend.go') diff --git a/eth/backend.go b/eth/backend.go new file mode 100644 index 000000000..9154ca0f5 --- /dev/null +++ b/eth/backend.go @@ -0,0 +1,357 @@ +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() + } + } +} -- cgit v1.2.3