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server.go
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server.go
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package erwscascade
import (
"encoding/json"
"errors"
"log"
"net"
"net/http"
"net/url"
"regexp"
"strings"
"sync"
"time"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
)
var responseChan = make(chan CascadingWsMessage)
type WsClientConn struct {
Conn *net.Conn
RspChan chan CascadingWsMessage
CInfo ClientInfo
}
var clientConnections = make(map[string]*WsClientConn)
var connectionsThreads = make(map[string]chan struct{})
var connectionsLock sync.RWMutex
var gSn int = 0
func (p *ErWsCascadeConfig) transWsProxyMessage(cid string, req ProxyMessage) ([]byte, error) {
connectionsLock.Lock()
client, ok := clientConnections[cid]
connectionsLock.Unlock()
if !ok {
return nil, errors.New("no find client")
}
reqPad, _ := json.Marshal(req)
gSn++
reqMsg := CascadingWsMessage{
Sn: gSn,
Type: HTTPProxyReq,
Pad: reqPad,
}
reqBytes, _ := json.Marshal(reqMsg)
log.Printf("server proxy msg sn:%v, type:%v\n", reqMsg.Sn, reqMsg.Type)
err := wsutil.WriteServerMessage(*client.Conn, ws.OpText, reqBytes)
if err != nil {
log.Println("WriteServerMessage err:", err)
return nil, err
}
// 设置超时时间为 10 秒
timeout := time.After(10 * time.Second)
for {
select {
case rspMsg := <-client.RspChan:
log.Printf("client rsp msg sn:%v, type:%v\n", rspMsg.Sn, rspMsg.Type)
// 收到响应消息
if rspMsg.Sn == reqMsg.Sn {
return rspMsg.Pad, nil
} else {
//继续等超时
continue
}
case <-timeout:
log.Println("Timeout: No response received within 10 seconds")
return nil, errors.New("time out")
}
}
return nil, nil
}
func (p *ErWsCascadeConfig) sendWsMessageToClient(cid string, message string) {
connectionsLock.Lock()
client, ok := clientConnections[cid]
connectionsLock.Unlock()
if ok {
err := wsutil.WriteServerMessage(*client.Conn, ws.OpText, []byte(message))
if err != nil {
log.Println("Error sending message to client:", err)
}
}
}
func (p *ErWsCascadeConfig) receiveWsMessages(client *WsClientConn, cid string) {
for {
msg, _, err := wsutil.ReadClientData(*client.Conn)
if err != nil {
log.Println("Error reading message:", err)
break
}
log.Printf("Received message from client: %s\n", cid)
// Handle client messages here
//p.sendWsMessageToClient(cid, "Server RSP")
// 解析收到的消息为 CascadingWsProxyMessage
var wsMessage CascadingWsMessage
err = json.Unmarshal(msg, &wsMessage)
if err != nil {
log.Printf("Error decoding message: %v", err)
continue
}
if wsMessage.Type == HTTPProxyRsp {
//通知阻塞函数
client.RspChan <- wsMessage
} else if wsMessage.Type == CInfo {
var clientInfo ClientInfo
err := json.Unmarshal(wsMessage.Pad, &clientInfo)
if err != nil {
log.Println("Error parsing clientInfo:", err)
continue
}
log.Println("Parsed ClientInfo:", clientInfo)
client.CInfo = clientInfo
} else {
log.Println("MessageType is:", wsMessage.Type.String())
}
}
log.Printf("ws client offline cid: %s\n", cid)
// 断开连接时清理操作
connectionsLock.Lock()
delete(clientConnections, cid)
close(connectionsThreads[cid])
connectionsLock.Unlock()
}
func (p *ErWsCascadeConfig) Wsocket_(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("Upgrade") == "websocket" {
// 判断 URL 中是否包含 "register" 关键字
//customHeader := r.Header.Get("X-Custom-Header")
// 获取完整的 URL
fullURL := r.URL.String()
//判断URL编码特殊字符%2F,%2B,%3F,%25,包含这些则自动转码?= 等
log.Printf("Full URL: %s\n", fullURL)
if matched, _ := regexp.MatchString("/register", r.URL.Path); matched {
// 获取 cid 参数
//cid := r.URL.Query().Get("cid")
// 解码 URL
decodedURL, err := url.QueryUnescape(fullURL)
if err != nil {
log.Printf("Error decoding URL: %v\n", err)
return
}
// 手动解析解码后的 URL 中的参数
var queryString string
if strings.Contains(decodedURL, "?") {
queryString = strings.Split(decodedURL, "?")[1]
}
queryParams, err := url.ParseQuery(queryString)
if err != nil {
log.Printf("Error parsing query string: %v\n", err)
return
}
cid := queryParams.Get("cid")
log.Printf("CID value: %s\n", cid)
conn, _, _, err := ws.UpgradeHTTP(r, w)
if err != nil {
log.Printf("UpgradeHTTP error:%v", err)
return
}
if cid == "" {
log.Printf("invalid cid refuse connect\n")
conn.Close()
return
}
client := WsClientConn{
Conn: &conn,
RspChan: make(chan CascadingWsMessage),
}
connectionsLock.Lock()
clientConnections[cid] = &client
connectionsThreads[cid] = make(chan struct{})
connectionsLock.Unlock()
// 启动线程接收客户端消息
go p.receiveWsMessages(&client, cid)
}
return
} else {
return
}
}