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server.go
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server.go
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package server
import (
"bytes"
"encoding/gob"
"fmt"
"log"
"net"
"github.com/lugassawan/learning-golang-blockchain/blockchain"
"github.com/lugassawan/learning-golang-blockchain/transaction"
)
const (
protocol = "tcp"
nodeVersion = 1
commandLength = 12
)
type Server struct {
nodeId string
nodeAddress string
miningAddress string
knownNodes []string
blocksInTransit [][]byte
mempool map[string]*transaction.Transaction
}
// InitServer creates Server instance with empty miner address
func InitServer(nodeId string) *Server {
return &Server{
nodeId,
fmt.Sprintf("localhost:%s", nodeId),
"",
[]string{"localhost:3000"},
[][]byte{},
make(map[string]*transaction.Transaction),
}
}
func (s *Server) KnownNodes() []string {
return s.knownNodes
}
// Start starts a node
func (s *Server) Start(minerAddress string) {
s.miningAddress = minerAddress
ln, err := net.Listen(protocol, s.nodeAddress)
if err != nil {
log.Panic(err)
}
defer ln.Close()
bc := blockchain.NewBlockchain(s.nodeId)
if s.nodeAddress != s.knownNodes[0] {
s.sendVersion(s.knownNodes[0], bc)
}
for {
conn, err := ln.Accept()
if err != nil {
log.Panic(err)
}
go s.handleConnection(conn, bc)
}
}
func (s *Server) gobEncode(data interface{}) []byte {
var buff bytes.Buffer
enc := gob.NewEncoder(&buff)
err := enc.Encode(data)
if err != nil {
log.Panic(err)
}
return buff.Bytes()
}
func (s *Server) nodeIsKnown(addr string) bool {
for _, node := range s.knownNodes {
if node == addr {
return true
}
}
return false
}