forked from Terry-Mao/gopush2
/
pubsub_tcp.go
268 lines (228 loc) · 5.8 KB
/
pubsub_tcp.go
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package main
import (
"bufio"
"errors"
"net"
"strconv"
"time"
)
var (
CmdFmtErr = errors.New("cmd format error")
CmdSizeErr = errors.New("cmd data size error")
)
func StartTCP() error {
addr, err := net.ResolveTCPAddr("tcp", Conf.Addr)
if err != nil {
Log.Printf("net.ResolveTCPAddr(\"tcp\"), %s) failed (%s)", Conf.Addr, err.Error())
return err
}
l, err := net.ListenTCP("tcp", addr)
if err != nil {
Log.Printf("net.ListenTCP(\"tcp4\", \"%s\") failed (%s)", Conf.Addr, err.Error())
return err
}
// free the listener resource
defer func() {
if err := l.Close(); err != nil {
Log.Printf("l.Close() failed (%s)", err.Error())
}
}()
// loop for accept conn
for {
conn, err := l.AcceptTCP()
if err != nil {
Log.Printf("l.AcceptTCP() failed (%s)", err.Error())
continue
}
if err = conn.SetKeepAlive(Conf.TCPKeepAlive == 1); err != nil {
Log.Printf("conn.SetKeepAlive() failed (%s)", err.Error())
conn.Close()
continue
}
if err = conn.SetReadBuffer(Conf.ReadBufByte); err != nil {
Log.Printf("conn.SetReadBuffer(%d) failed (%s)", Conf.ReadBufByte, err.Error())
conn.Close()
continue
}
if err = conn.SetWriteBuffer(Conf.WriteBufByte); err != nil {
Log.Printf("conn.SetWriteBuffer(%d) failed (%s)", Conf.WriteBufByte, err.Error())
conn.Close()
continue
}
go handleTCPConn(conn)
}
// nerve here
return nil
}
func handleTCPConn(conn net.Conn) {
defer recoverFunc()
defer func() {
if err := conn.Close(); err != nil {
Log.Printf("conn.Close() failed (%s)", err.Error())
}
}()
// parse protocol reference: http://redis.io/topics/protocol (use redis protocol)
rd := bufio.NewReader(conn)
// get argument number
argNum, err := parseCmdSize(rd, '*')
if err != nil {
Log.Printf("parse cmd argument number error")
return
}
if argNum < 1 {
Log.Printf("parse cmd argument number length error")
return
}
args := make([]string, argNum)
for i := 0; i < argNum; i-- {
// get argument length
cmdLen, err := parseCmdSize(rd, '$')
if err != nil {
Log.Printf("parse cmd first argument size error")
return
}
// get argument data
d, err := parseCmdData(rd, cmdLen)
if err != nil {
Log.Printf("parse cmd data error")
return
}
// append args
args = append(args, string(d))
}
switch args[0] {
case "sub":
SubscribeTCPHandle(conn, args[1:])
break
default:
Log.Printf("tcp protocol unknown cmd: %s", args[0])
return
}
return
}
// SubscribeTCPHandle handle the subscribers's connection
func SubscribeTCPHandle(conn net.Conn, args []string) {
argLen := len(args)
if argLen < 2 {
Log.Printf("subscriber missing argument")
return
}
// key, mid, heartbeat, token
key := args[0]
midStr := args[1]
mid, err := strconv.ParseInt(midStr, 10, 64)
if err != nil {
Log.Printf("mid argument error (%s)", err.Error())
return
}
heartbeat := Conf.HeartbeatSec
heartbeatStr := ""
if argLen > 2 {
heartbeatStr = args[2]
i, err := strconv.Atoi(heartbeatStr)
if err != nil {
Log.Printf("heartbeat argument error (%s)", err.Error())
return
}
heartbeat = i
}
token := ""
if argLen > 3 {
token = args[3]
}
Log.Printf("client %s subscribe to key = %s, mid = %d, token = %s, heartbeat = %d", conn.RemoteAddr().String(), key, mid, token, heartbeat)
// fetch subscriber from the channel
c, err := channel.Get(key)
if err != nil {
if Conf.Auth == 0 {
c, err = channel.New(key)
if err != nil {
Log.Printf("device %s: can't create channle", key)
return
}
} else {
Log.Printf("device %s: can't get a channel (%s)", key, err.Error())
return
}
}
// auth
if Conf.Auth == 1 {
if err = c.AuthToken(token, key); err != nil {
Log.Printf("device %s: auth token failed \"%s\" (%s)", key, token, err.Error())
return
}
}
// send stored message, and use the last message id if sent any
if err = c.SendMsg(conn, mid, key); err != nil {
Log.Printf("device %s: send offline message failed (%s)", key, err.Error())
return
}
// add a conn to the channel
if err = c.AddConn(conn, mid, key); err != nil {
Log.Printf("device %s: add conn failed (%s)", key, err.Error())
return
}
// remove exists conn
defer func() {
if err := c.RemoveConn(conn, mid, key); err != nil {
Log.Printf("device %s: remove conn failed (%s)", key, err.Error())
}
}()
// blocking wait client heartbeat
reply := make([]byte, 1)
for {
conn.SetReadDeadline(time.Now().Add(time.Second * time.Duration(heartbeat)))
if _, err = conn.Read(reply); err != nil {
Log.Printf("conn.Read() failed (%s)", err.Error())
return
}
if string(reply) == heartbeatMsg {
if _, err = conn.Write(heartbeatBytes); err != nil {
Log.Printf("device %s: write heartbeat to client failed (%s)", key, err.Error())
return
}
Log.Printf("device %s: receive heartbeat", key)
} else {
Log.Printf("device %s: unknown heartbeat protocol", key)
return
}
}
return
}
func parseCmdSize(rd *bufio.Reader, prefix uint8) (int, error) {
cmdBuf := make([]byte, 8)
for {
cmd, err := rd.ReadBytes('\n')
if err != nil {
Log.Printf("rd.ReadBytes('\n') failed (%s)", err.Error())
return 0, err
}
cmdBuf = append(cmdBuf, cmd...)
if len(cmd) > 0 && cmd[len(cmd)-1] == '\r' {
break
}
}
cmd := string(cmdBuf)
cmdLen := len(cmd)
if cmdLen <= 3 || cmd[0] != prefix {
Log.Printf("tcp protocol cmd: %s number format error", cmd)
return 0, CmdFmtErr
}
// skip the \r
cmdSize, err := strconv.Atoi(cmd[1 : cmdLen-1])
if err != nil {
Log.Printf("tcp protocol cmd: %s number parse int failed (%s)", cmd, err.Error())
return 0, CmdFmtErr
}
return cmdSize, nil
}
func parseCmdData(rd *bufio.Reader, cmdLen int) ([]byte, error) {
rcmdLen := cmdLen + 2
buf := make([]byte, rcmdLen)
if n, err := rd.Read(buf); err != nil {
return nil, err
} else if n != rcmdLen {
return nil, CmdSizeErr
}
return buf, nil
}