go-ethereum/server.go

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package main
import (
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"container/list"
"github.com/ethereum/ethdb-go"
"github.com/ethereum/ethutil-go"
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"github.com/ethereum/ethwire-go"
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"log"
"net"
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"sync/atomic"
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"time"
)
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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)
for e := peers.Front(); e != nil; e = e.Next() {
if peer, ok := e.Value.(*Peer); ok {
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callback(peer, e)
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}
}
}
type Server struct {
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// Channel for shutting down the server
shutdownChan chan bool
// DB interface
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//db *ethdb.LDBDatabase
db *ethdb.MemDatabase
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// Block manager for processing new blocks and managing the block chain
blockManager *BlockManager
// Peers (NYI)
peers *list.List
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// Nonce
Nonce uint64
}
func NewServer() (*Server, error) {
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//db, err := ethdb.NewLDBDatabase()
db, err := ethdb.NewMemDatabase()
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if err != nil {
return nil, err
}
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ethutil.SetConfig(db)
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nonce, _ := ethutil.RandomUint64()
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server := &Server{
shutdownChan: make(chan bool),
blockManager: NewBlockManager(),
db: db,
peers: list.New(),
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Nonce: nonce,
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}
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return server, nil
}
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func (s *Server) AddPeer(conn net.Conn) {
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peer := NewPeer(conn, s, true)
if peer != nil {
s.peers.PushBack(peer)
peer.Start()
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log.Println("Peer connected ::", conn.RemoteAddr())
}
}
func (s *Server) ConnectToPeer(addr string) error {
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peer := NewOutboundPeer(addr, s)
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s.peers.PushBack(peer)
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return nil
}
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func (s *Server) Broadcast(msgType ethwire.MsgType, data []byte) {
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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p.QueueMessage(ethwire.NewMessage(msgType, data))
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})
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}
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const (
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processReapingTimeout = 1 // TODO increase
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)
func (s *Server) ReapDeadPeers() {
for {
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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log.Println("Dead peer found .. reaping")
s.peers.Remove(e)
}
})
time.Sleep(processReapingTimeout * time.Second)
}
}
// Start the server
func (s *Server) Start() {
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// For now this function just blocks the main thread
ln, err := net.Listen("tcp", ":12345")
if err != nil {
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// This is mainly for testing to create a "network"
if Debug {
log.Println("Connection listening disabled. Acting as client")
err = s.ConnectToPeer("localhost:12345")
if err != nil {
log.Println("Error starting server", err)
s.Stop()
}
return
} else {
log.Fatal(err)
}
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}
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// Start the reaping processes
go s.ReapDeadPeers()
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go func() {
for {
conn, err := ln.Accept()
if err != nil {
log.Println(err)
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continue
}
go s.AddPeer(conn)
}
}()
// TMP
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/*
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go func() {
for {
s.Broadcast("block", s.blockManager.bc.GenesisBlock().RlpEncode())
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time.Sleep(1000 * time.Millisecond)
}
}()
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*/
}
func (s *Server) Stop() {
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// Close the database
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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s.shutdownChan <- true
}
// This function will wait for a shutdown and resumes main thread execution
func (s *Server) WaitForShutdown() {
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<-s.shutdownChan
}