mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-25 12:57:17 +00:00
355 lines
7.5 KiB
Go
355 lines
7.5 KiB
Go
package eth
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import (
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"container/list"
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"github.com/ethereum/eth-go/ethchain"
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"github.com/ethereum/eth-go/ethdb"
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"github.com/ethereum/eth-go/ethutil"
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"github.com/ethereum/eth-go/ethwire"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"strconv"
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"sync"
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"sync/atomic"
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"time"
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)
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func eachPeer(peers *list.List, callback func(*Peer, *list.Element)) {
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// Loop thru the peers and close them (if we had them)
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for e := peers.Front(); e != nil; e = e.Next() {
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if peer, ok := e.Value.(*Peer); ok {
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callback(peer, e)
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}
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}
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}
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const (
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processReapingTimeout = 60 // TODO increase
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)
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type Ethereum struct {
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// Channel for shutting down the ethereum
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shutdownChan chan bool
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quit chan bool
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// DB interface
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//db *ethdb.LDBDatabase
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db ethutil.Database
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// State manager for processing new blocks and managing the over all states
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stateManager *ethchain.StateManager
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// The transaction pool. Transaction can be pushed on this pool
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// for later including in the blocks
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txPool *ethchain.TxPool
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// The canonical chain
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blockChain *ethchain.BlockChain
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// Peers (NYI)
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peers *list.List
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// Nonce
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Nonce uint64
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Addr net.Addr
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Port string
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peerMut sync.Mutex
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// Capabilities for outgoing peers
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serverCaps Caps
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nat NAT
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// Specifies the desired amount of maximum peers
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MaxPeers int
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}
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func New(caps Caps, usePnp bool) (*Ethereum, error) {
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db, err := ethdb.NewLDBDatabase("database")
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//db, err := ethdb.NewMemDatabase()
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if err != nil {
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return nil, err
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}
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var nat NAT
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if usePnp {
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nat, err = Discover()
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if err != nil {
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ethutil.Config.Log.Debugln("UPnP failed", err)
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}
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}
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ethutil.Config.Db = db
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nonce, _ := ethutil.RandomUint64()
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ethereum := &Ethereum{
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shutdownChan: make(chan bool),
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quit: make(chan bool),
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db: db,
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peers: list.New(),
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Nonce: nonce,
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serverCaps: caps,
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nat: nat,
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}
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ethereum.txPool = ethchain.NewTxPool(ethereum)
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ethereum.blockChain = ethchain.NewBlockChain(ethereum)
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ethereum.stateManager = ethchain.NewStateManager(ethereum)
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// Start the tx pool
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ethereum.txPool.Start()
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return ethereum, nil
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}
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func (s *Ethereum) BlockChain() *ethchain.BlockChain {
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return s.blockChain
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}
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func (s *Ethereum) StateManager() *ethchain.StateManager {
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return s.stateManager
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}
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func (s *Ethereum) TxPool() *ethchain.TxPool {
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return s.txPool
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}
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func (s *Ethereum) AddPeer(conn net.Conn) {
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peer := NewPeer(conn, s, true)
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if peer != nil && s.peers.Len() < s.MaxPeers {
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s.peers.PushBack(peer)
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peer.Start()
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}
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}
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func (s *Ethereum) ProcessPeerList(addrs []string) {
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for _, addr := range addrs {
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// TODO Probably requires some sanity checks
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s.ConnectToPeer(addr)
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}
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}
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func (s *Ethereum) ConnectToPeer(addr string) error {
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if s.peers.Len() < s.MaxPeers {
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var alreadyConnected bool
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eachPeer(s.peers, func(p *Peer, v *list.Element) {
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if p.conn == nil {
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return
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}
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phost, _, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
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ahost, _, _ := net.SplitHostPort(addr)
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if phost == ahost {
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alreadyConnected = true
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return
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}
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})
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if alreadyConnected {
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return nil
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}
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peer := NewOutboundPeer(addr, s, s.serverCaps)
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s.peers.PushBack(peer)
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log.Printf("[SERV] Adding peer %d / %d\n", s.peers.Len(), s.MaxPeers)
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}
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return nil
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}
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func (s *Ethereum) OutboundPeers() []*Peer {
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// Create a new peer slice with at least the length of the total peers
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outboundPeers := make([]*Peer, s.peers.Len())
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length := 0
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if !p.inbound && p.conn != nil {
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outboundPeers[length] = p
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length++
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}
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})
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return outboundPeers[:length]
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}
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func (s *Ethereum) InboundPeers() []*Peer {
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// Create a new peer slice with at least the length of the total peers
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inboundPeers := make([]*Peer, s.peers.Len())
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length := 0
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if p.inbound {
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inboundPeers[length] = p
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length++
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}
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})
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return inboundPeers[:length]
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}
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func (s *Ethereum) InOutPeers() []*Peer {
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// Reap the dead peers first
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s.reapPeers()
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// Create a new peer slice with at least the length of the total peers
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inboundPeers := make([]*Peer, s.peers.Len())
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length := 0
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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// Only return peers with an actual ip
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if len(p.host) > 0 {
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inboundPeers[length] = p
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length++
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}
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})
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return inboundPeers[:length]
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}
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func (s *Ethereum) Broadcast(msgType ethwire.MsgType, data []interface{}) {
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msg := ethwire.NewMessage(msgType, data)
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s.BroadcastMsg(msg)
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}
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func (s *Ethereum) BroadcastMsg(msg *ethwire.Msg) {
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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p.QueueMessage(msg)
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})
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}
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func (s *Ethereum) Peers() *list.List {
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return s.peers
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}
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func (s *Ethereum) reapPeers() {
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s.peerMut.Lock()
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defer s.peerMut.Unlock()
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if atomic.LoadInt32(&p.disconnect) == 1 || (p.inbound && (time.Now().Unix()-p.lastPong) > int64(5*time.Minute)) {
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s.peers.Remove(e)
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}
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})
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}
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func (s *Ethereum) ReapDeadPeerHandler() {
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reapTimer := time.NewTicker(processReapingTimeout * time.Second)
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for {
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select {
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case <-reapTimer.C:
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s.reapPeers()
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}
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}
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}
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// Start the ethereum
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func (s *Ethereum) Start() {
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// Bind to addr and port
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ln, err := net.Listen("tcp", ":"+s.Port)
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if err != nil {
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log.Println("Connection listening disabled. Acting as client")
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} else {
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// Starting accepting connections
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ethutil.Config.Log.Infoln("Ready and accepting connections")
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// Start the peer handler
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go s.peerHandler(ln)
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}
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if s.nat != nil {
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go s.upnpUpdateThread()
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}
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// Start the reaping processes
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go s.ReapDeadPeerHandler()
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if ethutil.Config.Seed {
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ethutil.Config.Log.Debugln("Seeding")
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// Testnet seed bootstrapping
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resp, err := http.Get("https://www.ethereum.org/servers.poc3.txt")
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if err != nil {
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log.Println("Fetching seed failed:", err)
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return
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Println("Reading seed failed:", err)
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return
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}
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s.ConnectToPeer(string(body))
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}
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}
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func (s *Ethereum) peerHandler(listener net.Listener) {
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for {
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conn, err := listener.Accept()
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if err != nil {
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ethutil.Config.Log.Debugln(err)
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continue
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}
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go s.AddPeer(conn)
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}
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}
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func (s *Ethereum) Stop() {
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// Close the database
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defer s.db.Close()
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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p.Stop()
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})
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close(s.quit)
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s.txPool.Stop()
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s.stateManager.Stop()
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close(s.shutdownChan)
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}
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// This function will wait for a shutdown and resumes main thread execution
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func (s *Ethereum) WaitForShutdown() {
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<-s.shutdownChan
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}
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func (s *Ethereum) upnpUpdateThread() {
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// Go off immediately to prevent code duplication, thereafter we renew
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// lease every 15 minutes.
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timer := time.NewTimer(0 * time.Second)
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lport, _ := strconv.ParseInt(s.Port, 10, 16)
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first := true
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out:
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for {
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select {
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case <-timer.C:
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var err error
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_, err = s.nat.AddPortMapping("TCP", int(lport), int(lport), "eth listen port", 20*60)
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if err != nil {
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ethutil.Config.Log.Debugln("can't add UPnP port mapping:", err)
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break out
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}
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if first && err == nil {
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_, err = s.nat.GetExternalAddress()
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if err != nil {
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ethutil.Config.Log.Debugln("UPnP can't get external address:", err)
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continue out
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}
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first = false
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}
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timer.Reset(time.Minute * 15)
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case <-s.quit:
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break out
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}
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}
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timer.Stop()
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if err := s.nat.DeletePortMapping("TCP", int(lport), int(lport)); err != nil {
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ethutil.Config.Log.Debugln("unable to remove UPnP port mapping:", err)
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} else {
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ethutil.Config.Log.Debugln("succesfully disestablished UPnP port mapping")
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}
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}
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