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lookup_peer.go
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/
lookup_peer.go
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package emqd
import (
"bufio"
"errors"
"net"
"time"
log "github.com/ericluj/elog"
"github.com/ericluj/emq/internal/command"
"github.com/ericluj/emq/internal/common"
"github.com/ericluj/emq/internal/protocol"
)
type LookupPeer struct {
addr string
conn net.Conn
reader *bufio.Reader
state int32
// info PeerInfo
}
type PeerInfo struct {
TCPPort int `json:"tcp_port"`
HTTPPort int `json:"http_port"`
BroadcastAddress string `json:"broadcast_address"`
}
func NewLookupPeer(addr string) *LookupPeer {
return &LookupPeer{
addr: addr,
state: common.PeerInit,
}
}
func (lp *LookupPeer) Connect(e *EMQD) error {
log.Infof("lookup connect to %s", lp.addr)
initialState := lp.state
// tcp连接
conn, err := net.DialTimeout("tcp", lp.addr, common.DialTimeout)
if err != nil {
return err
}
lp.conn = conn
lp.reader = bufio.NewReaderSize(conn, common.DefaultBufferSize)
lp.state = common.PeerConnected
// 如果不是第一次连接,不需要下面的逻辑
if initialState != common.PeerInit {
return nil
}
// 协议版本
_, err = lp.Write([]byte(common.ProtoMagic))
if err != nil {
lp.Close()
return err
}
// identify
identifyData := map[string]interface{}{
"tcp_address": e.GetOpts().TCPAddress,
"http_address": e.GetOpts().HTTPAddress,
}
cmd, err := command.IDENTIFYCmd(identifyData)
if err != nil {
lp.Close()
return err
}
resp, err := lp.Command(cmd)
if err != nil {
return err
}
log.Debugf("IDENTIFYCmd resp: %s", resp)
// TODO: 返回数据待处理
// 注册到lookupd
var cmds []*command.Command
e.mtx.RLock()
for _, topic := range e.topicMap {
topic.mtx.RLock()
if len(topic.channelMap) == 0 {
cmds = append(cmds, command.RegisterCmd(topic.name, ""))
} else {
for _, channel := range topic.channelMap {
cmds = append(cmds, command.RegisterCmd(channel.topicName, channel.name))
}
}
topic.mtx.RUnlock()
}
e.mtx.RUnlock()
for _, cmd := range cmds {
log.Infof("lookup: %s, cmd: %s", lp.addr, cmd)
_, err := lp.Command(cmd)
if err != nil {
log.Errorf("Command: %v, lookup: %s, cmd: %v,", err, lp.addr, cmd)
return err
}
}
return nil
}
func (lp *LookupPeer) Write(data []byte) (int, error) {
err := lp.conn.SetWriteDeadline(time.Now().Add(common.WriteTimeout))
if err != nil {
return 0, err
}
return lp.conn.Write(data)
}
func (lp *LookupPeer) Read(data []byte) (int, error) {
err := lp.conn.SetReadDeadline(time.Now().Add(common.ReadTimeout))
if err != nil {
return 0, err
}
return lp.conn.Read(data)
}
func (lp *LookupPeer) Close() error {
lp.state = common.PeerInit
if lp.conn != nil {
return lp.conn.Close()
}
return nil
}
func (lp *LookupPeer) Command(cmd *command.Command) ([]byte, error) {
err := lp.conn.SetWriteDeadline(time.Now().Add(common.WriteTimeout))
if err != nil {
return nil, err
}
if err := cmd.Write(lp.conn); err != nil {
lp.Close()
return nil, err
}
frameType, body, err := protocol.ReadFrameData(lp.reader)
if err != nil {
lp.Close()
return nil, err
}
if frameType == common.FrameTypeError {
return nil, errors.New(string(body))
}
return body, nil
}