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udp.go
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udp.go
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/*
* Copyright (c) 2024 Yunshan Networks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package debug
import (
"bytes"
"encoding/gob"
"errors"
"net"
"os"
"strconv"
"strings"
"time"
logging "github.com/op/go-logging"
"github.com/spf13/cobra"
)
type ModuleId uint16
type ModuleOperate uint16
type RegisterCommmandLine func(moduleId ModuleId) *cobra.Command
type CommandLineProcess interface {
RecvCommand(conn *net.UDPConn, remote *net.UDPAddr, operate uint16, arg *bytes.Buffer)
}
const (
DEFAULT_LISTEN_PORT = 9528
UDP_MAXLEN = 9710
MAX_PAYLOAD_LEN = UDP_MAXLEN - 128 //发送时会封装为DebugMessage,净荷为DebugMessage的Args
MODULE_MAX = 32
)
var (
hostIp = "0.0.0.0"
hostPort int = DEFAULT_LISTEN_PORT
running = false
log = logging.MustGetLogger(os.Args[0])
recvHandlers = [MODULE_MAX]CommandLineProcess{}
registerHandlers = [MODULE_MAX]RegisterCommmandLine{}
)
type DebugMessage struct {
Module, Operate uint16
Result uint32
Args []byte
}
func SetIpAndPort(ip string, port int) {
hostIp = ip
hostPort = port
}
func RecvFromServer(conn *net.UDPConn) (*bytes.Buffer, error) {
data := make([]byte, UDP_MAXLEN)
msg := DebugMessage{}
if _, _, err := conn.ReadFrom(data); err != nil {
return nil, err
}
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
if err := decoder.Decode(&msg); err != nil {
return nil, err
} else if msg.Result != 0 {
return nil, errors.New("msg.Result != 0")
}
return bytes.NewBuffer(msg.Args[:]), nil
}
func SendToServer(module ModuleId, operate ModuleOperate, args *bytes.Buffer) (*net.UDPConn, *bytes.Buffer, error) {
ip := hostIp
if strings.Contains(ip, ":") {
ip = "[" + ip + "]"
}
conn, err := net.Dial("udp", ip+":"+strconv.Itoa(hostPort))
if err != nil {
return nil, nil, err
}
sendBuffer := bytes.Buffer{}
conn.SetReadDeadline(time.Now().Add(time.Minute))
msg := DebugMessage{Module: uint16(module), Operate: uint16(operate), Result: 0}
if args != nil {
msg.Args = args.Bytes()
}
encoder := gob.NewEncoder(&sendBuffer)
if err := encoder.Encode(msg); err != nil {
return conn.(*net.UDPConn), nil, err
}
conn.Write(sendBuffer.Bytes())
var recv *bytes.Buffer
if module > MODULE_MAX {
recv, err = RecvFromServerMulti(conn.(*net.UDPConn))
} else {
recv, err = RecvFromServer(conn.(*net.UDPConn))
}
return conn.(*net.UDPConn), recv, err
}
func SendToClient(conn *net.UDPConn, remote *net.UDPAddr, result uint32, args *bytes.Buffer) {
buffer := bytes.Buffer{}
msg := DebugMessage{Module: 0, Result: result, Operate: 11}
if args != nil {
msg.Args = args.Bytes()
}
encoder := gob.NewEncoder(&buffer)
if err := encoder.Encode(msg); err != nil {
log.Error(err)
return
}
if buffer.Len() > UDP_MAXLEN {
log.Warningf("data.Len=%d buffer.Len=%d > %d", len(msg.Args), buffer.Len(), UDP_MAXLEN)
return
}
conn.WriteToUDP(buffer.Bytes(), remote)
return
}
func process(conn *net.UDPConn) {
data := make([]byte, UDP_MAXLEN)
msg := DebugMessage{}
_, remote, err := conn.ReadFromUDP(data)
if err != nil {
return
}
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
if err := decoder.Decode(&msg); err != nil {
log.Error(err)
return
}
if msg.Module < MODULE_MAX && recvHandlers[msg.Module] != nil {
recvHandlers[msg.Module].RecvCommand(conn, remote, msg.Operate, bytes.NewBuffer(msg.Args[:]))
return
}
if simpleHandlers[msg.Module] != nil {
result := simpleHandlers[msg.Module].HandleSimpleCommand(msg.Operate, string(msg.Args))
for i := 0; i < len(result); i += MAX_PAYLOAD_LEN {
if i+MAX_PAYLOAD_LEN > len(result) {
SendToClient(conn, remote, 0, bytes.NewBufferString(result[i:]))
} else {
SendToClient(conn, remote, 0, bytes.NewBufferString(result[i:i+MAX_PAYLOAD_LEN]))
}
// upd发送太快,对端接收不及时,会导致丢包,调试结果无法显示
time.Sleep(10 * time.Millisecond)
}
// 补充发送"\n"用来指示客户端只要收到小于MAX_PAYLOAD_LEN的数据,就认为接收结束了
if len(result) > 0 && len(result)%MAX_PAYLOAD_LEN == 0 {
SendToClient(conn, remote, 0, bytes.NewBufferString("\n"))
}
return
}
}
func debugListener() {
go func() {
addr := &net.UDPAddr{IP: net.ParseIP(hostIp), Port: hostPort}
listener, err := net.ListenUDP("udp", addr)
if err != nil {
log.Warning(err)
listener, err = net.ListenUDP("udp", &net.UDPAddr{Port: hostPort})
if err != nil {
log.Error(err)
return
}
}
defer listener.Close()
log.Infof("DebugListener <%v:%v>", hostIp, hostPort)
for {
process(listener)
}
}()
}
// server端注册命令处理
func Register(module ModuleId, process CommandLineProcess) {
recvHandlers[module] = process
if running == false {
debugListener()
running = true
}
}
// client注册命令处理
func RegisterCommand(root *cobra.Command, moduleId ModuleId, handle RegisterCommmandLine) {
root.AddCommand(handle(moduleId))
}