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transport.go
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transport.go
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package main
import (
"encoding/binary"
"errors"
"fmt"
"github.com/coreos/etcd/raft"
pb "github.com/coreos/etcd/raft/raftpb"
"io"
"net"
"os"
)
var ErrShortPacket = errors.New("the packet have not enough length")
type Transport interface {
send(msg pb.Message) error
stop()
listen() error
receive() chan pb.Message
}
type tcpTransport struct {
addr string
peerC map[uint64]net.Conn
reciv chan pb.Message
}
type Packet struct {
Size uint32
Data []byte
}
func GenPacket(data []byte) []byte {
b := make([]byte, 4)
binary.BigEndian.PutUint32(b[:4], uint32(len(data)))
b = append(b, data...)
return b
}
func ReadPacket(conn net.Conn) (*Packet, error) {
p := &Packet{}
size := make([]byte, 4)
n, err := conn.Read(size)
if err != nil || n != 4 {
fmt.Fprintln(os.Stdout, "read socket head len:", n, "nend:4", err)
return nil, err
}
p.Size = binary.BigEndian.Uint32(size)
data := make([]byte, int(p.Size))
offset := 0
for {
n, err = conn.Read(data[offset:])
if err != nil && err != io.EOF {
fmt.Fprintln(os.Stdout, "have an error", err)
}
offset += n
if offset == int(p.Size) {
break
}
}
p.Data = data
return p, nil
}
func newtcpTransport(id uint64, peers []raft.Peer, addrs []string) Transport {
t := &tcpTransport{
reciv: make(chan pb.Message, 1024),
}
t.peerC = make(map[uint64]net.Conn)
for i, peer := range peers {
if peer.ID != id {
go t.initPeerClient(peer.ID, addrs[i])
} else {
t.addr = addrs[i]
}
}
return t
}
func (t *tcpTransport) initPeerClient(id uint64, addr string) {
var (
conn net.Conn
err error
)
for conn, err = net.Dial("tcp", addr); err != nil; {
conn, err = net.Dial("tcp", addr)
}
fmt.Println("init client id", id, conn.RemoteAddr())
t.peerC[id] = conn
}
func (t *tcpTransport) listen() error {
l, e := net.Listen("tcp", t.addr)
if e != nil {
fmt.Fprint(os.Stdout, "listen err:", e)
}
for {
conn, err := l.Accept()
if err != nil {
fmt.Fprintf(os.Stdout, "accept connetion error:%s\n", err.Error())
}
go t.handleConnection(conn)
}
}
func (t *tcpTransport) handleConnection(c net.Conn) {
for {
p, e := ReadPacket(c)
if e != nil {
fmt.Fprintf(os.Stdout, "read from connection err:%s\n", e.Error())
}
m := pb.Message{}
if e := m.Unmarshal(p.Data); e != nil {
fmt.Fprint(os.Stdout, "unmarshal protobuf Message data error:", e)
}
select {
case t.reciv <- m:
fmt.Fprintln(os.Stdout, "receive from:", m.From, "to:", m.To)
default:
}
}
}
func (t *tcpTransport) receive() chan pb.Message {
return t.reciv
}
func (t *tcpTransport) stop() {
t = nil
os.Exit(0)
}
func (t *tcpTransport) send(msg pb.Message) error {
data, err := msg.Marshal()
if err != nil {
fmt.Fprint(os.Stdout, "marshal message err:", err)
return err
}
fmt.Println(msg)
p := GenPacket(data)
fmt.Println(len(p))
n, err := t.peerC[msg.To].Write(p)
if err != nil {
fmt.Fprintf(os.Stdout, "socket write data err:%s\n", err.Error())
return err
}
if n != 4+len(data) {
fmt.Fprintln(os.Stdout, "write data short", n, 4+len(data))
return ErrShortPacket
}
fmt.Fprint(os.Stdout, msg.From, "--->", msg.To, "\n")
return nil
}