749 lines
18 KiB
Go
749 lines
18 KiB
Go
package excservice
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||
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||
import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"go-admin/common/global"
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"go-admin/common/helper"
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"go-admin/models/binancedto"
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"go-admin/models/commondto"
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"go-admin/pkg/jsonhelper"
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"go-admin/pkg/utility"
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"math/rand"
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"net"
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"net/http"
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"net/url"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/bytedance/sonic"
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log "github.com/go-admin-team/go-admin-core/logger"
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"github.com/gorilla/websocket"
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"golang.org/x/net/proxy"
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)
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type BinanceWebSocketManager struct {
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ws *websocket.Conn
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stopChannel chan struct{}
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url string
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/* 0-现货 1-合约 */
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wsType int
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apiKey string
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apiSecret string
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proxyType string
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proxyAddress string
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reconnect chan struct{}
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isStopped bool // 标记 WebSocket 是否已主动停止
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mu sync.Mutex // 用于控制并发访问 isStopped
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cancelFunc context.CancelFunc
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listenKey string // 新增字段
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reconnecting atomic.Bool // 防止重复重连
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ConnectTime time.Time // 当前连接建立时间
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}
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// 已有连接
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var SpotSockets = map[string]*BinanceWebSocketManager{}
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var FutureSockets = map[string]*BinanceWebSocketManager{}
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func NewBinanceWebSocketManager(wsType int, apiKey, apiSecret, proxyType, proxyAddress string) *BinanceWebSocketManager {
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url := ""
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switch wsType {
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case 0:
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url = "wss://stream.binance.com:9443/ws"
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case 1:
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url = "wss://fstream.binance.com/ws"
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}
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return &BinanceWebSocketManager{
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stopChannel: make(chan struct{}, 10),
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reconnect: make(chan struct{}, 10),
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isStopped: false,
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url: url,
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wsType: wsType,
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apiKey: apiKey,
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apiSecret: apiSecret,
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proxyType: proxyType,
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proxyAddress: proxyAddress,
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}
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}
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func (wm *BinanceWebSocketManager) GetKey() string {
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return wm.apiKey
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}
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func (wm *BinanceWebSocketManager) Start() {
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utility.SafeGo(wm.run)
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// wm.run()
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}
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// 重启连接
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func (wm *BinanceWebSocketManager) Restart(apiKey, apiSecret, proxyType, proxyAddress string) *BinanceWebSocketManager {
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wm.mu.Lock()
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defer wm.mu.Unlock()
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wm.apiKey = apiKey
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wm.apiSecret = apiSecret
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wm.proxyType = proxyType
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wm.proxyAddress = proxyAddress
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if wm.isStopped {
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wm.isStopped = false
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utility.SafeGo(wm.run)
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} else {
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log.Warnf("调用restart")
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wm.triggerReconnect(true)
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}
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return wm
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}
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// 触发重连
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func (wm *BinanceWebSocketManager) triggerReconnect(force bool) {
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if force {
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wm.reconnecting.Store(false) // 强制重置标志位
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}
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if wm.reconnecting.CompareAndSwap(false, true) {
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log.Warnf("准备重连 key: %s wsType: %v", wm.apiKey, wm.wsType)
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// 发送信号触发重连协程
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select {
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case wm.reconnect <- struct{}{}:
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default:
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// 防止阻塞，如果通道满了就跳过
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}
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}
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}
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func Restart(wm *BinanceWebSocketManager) {
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log.Warnf("调用restart")
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wm.triggerReconnect(true)
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}
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func (wm *BinanceWebSocketManager) run() {
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ctx, cancel := context.WithCancel(context.Background())
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wm.cancelFunc = cancel
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utility.SafeGo(wm.handleSignal)
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||
// 计算错误记录键
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errKey := fmt.Sprintf(global.API_WEBSOCKET_ERR, wm.apiKey)
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errMessage := commondto.WebSocketErr{Time: time.Now()}
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helper.DefaultRedis.SetString(errKey, jsonhelper.ToJsonString(errMessage))
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for {
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select {
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case <-ctx.Done():
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return
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default:
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||
if err := wm.connect(ctx); err != nil {
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wm.handleConnectionError(errKey, err)
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if wm.isErrorCountExceeded(errKey) {
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log.Error("连接 %s WebSocket 时出错次数过多，停止 WebSocket 管理器: %v", wm.wsType, wm.apiKey)
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wm.Stop()
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return
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}
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time.Sleep(5 * time.Second)
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continue
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}
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<-wm.stopChannel
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log.Info("停止 %s WebSocket 管理器...", getWsTypeName(wm.wsType))
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wm.Stop()
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return
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}
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}
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}
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// handleConnectionError 处理 WebSocket 连接错误
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func (wm *BinanceWebSocketManager) handleConnectionError(errKey string, err error) {
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// 从 Redis 获取错误记录
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var errMessage commondto.WebSocketErr
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val, _ := helper.DefaultRedis.GetString(errKey)
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if val != "" {
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sonic.UnmarshalString(val, &errMessage)
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}
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// 更新错误记录
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errMessage.Count++
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errMessage.Time = time.Now()
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errMessage.ErrorMessage = err.Error()
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// 将错误记录保存到 Redis
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if data, err := sonic.MarshalString(errMessage); err == nil {
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helper.DefaultRedis.SetString(errKey, data)
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}
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// 记录错误日志
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log.Error("连接 %s WebSocket 时出错: %v, 错误: %v", wm.wsType, wm.apiKey, err)
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}
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// isErrorCountExceeded 检查错误次数是否超过阈值
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||
func (wm *BinanceWebSocketManager) isErrorCountExceeded(errKey string) bool {
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val, _ := helper.DefaultRedis.GetString(errKey)
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if val == "" {
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return false
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}
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var errMessage commondto.WebSocketErr
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if err := sonic.UnmarshalString(val, &errMessage); err != nil {
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||
return false
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}
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return errMessage.Count >= 5
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}
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// 处理终止信号
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func (wm *BinanceWebSocketManager) handleSignal() {
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ch := make(chan os.Signal)
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signal.Notify(ch, os.Interrupt)
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<-ch
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wm.Stop()
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}
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func (wm *BinanceWebSocketManager) connect(ctx context.Context) error {
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dialer, err := wm.getDialer()
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if err != nil {
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return err
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||
}
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listenKey, err := wm.getListenKey()
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if err != nil {
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return err
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}
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wm.listenKey = listenKey
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url := fmt.Sprintf("%s/%s", wm.url, listenKey)
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wm.ws, _, err = dialer.Dial(url, nil)
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if err != nil {
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return err
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}
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// 连接成功，更新连接时间
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wm.ConnectTime = time.Now()
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log.Info(fmt.Sprintf("已连接到 Binance %s WebSocket【%s】 key:%s", getWsTypeName(wm.wsType), wm.apiKey, listenKey))
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// Ping处理
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wm.ws.SetPingHandler(func(appData string) error {
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log.Info(fmt.Sprintf("收到 wstype: %v key:%s Ping 消息【%s】", wm.wsType, wm.apiKey, appData))
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for x := 0; x < 5; x++ {
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if err := wm.ws.WriteControl(websocket.PongMessage, []byte(appData), time.Now().Add(time.Second*10)); err != nil {
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log.Error("binance 回应pong失败 次数:", strconv.Itoa(x), " err:", err)
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time.Sleep(time.Second * 1)
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continue
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}
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break
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||
}
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setLastTime(wm)
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return nil
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})
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utility.SafeGo(func() { wm.startListenKeyRenewal2(ctx) })
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utility.SafeGo(func() { wm.readMessages(ctx) })
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utility.SafeGo(func() { wm.handleReconnect(ctx) })
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utility.SafeGo(func() { wm.startPingLoop(ctx) })
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// utility.SafeGo(func() { wm.startDeadCheck(ctx) })
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return nil
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||
}
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// ReplaceConnection 创建新连接并关闭旧连接，实现无缝连接替换
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func (wm *BinanceWebSocketManager) ReplaceConnection() error {
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wm.mu.Lock()
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if wm.isStopped {
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wm.mu.Unlock()
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return errors.New("WebSocket 已停止")
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}
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oldCtxCancel := wm.cancelFunc
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oldConn := wm.ws
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wm.mu.Unlock()
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log.Infof("🔄 正在替换连接: %s", wm.apiKey)
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// 步骤 1：先获取新的 listenKey 和连接
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newListenKey, err := wm.getListenKey()
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||
if err != nil {
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return fmt.Errorf("获取新 listenKey 失败: %w", err)
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}
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||
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||
dialer, err := wm.getDialer()
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if err != nil {
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return err
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||
}
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newURL := fmt.Sprintf("%s/%s", wm.url, newListenKey)
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newConn, _, err := dialer.Dial(newURL, nil)
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if err != nil {
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||
return fmt.Errorf("新连接 Dial 失败: %w", err)
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}
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// 步骤 2：创建新的上下文并启动协程
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newCtx, newCancel := context.WithCancel(context.Background())
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// 设置 ping handler
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newConn.SetPingHandler(func(appData string) error {
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log.Infof("收到 Ping（新连接） key:%s msg:%s", wm.apiKey, appData)
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for x := 0; x < 5; x++ {
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if err := newConn.WriteControl(websocket.PongMessage, []byte(appData), time.Now().Add(10*time.Second)); err != nil {
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log.Errorf("Pong 失败 %d 次 err:%v", x, err)
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time.Sleep(time.Second)
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continue
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}
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break
|
||
}
|
||
setLastTime(wm)
|
||
return nil
|
||
})
|
||
|
||
// 步骤 3：安全切换连接
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wm.mu.Lock()
|
||
wm.ws = newConn
|
||
wm.listenKey = newListenKey
|
||
wm.ConnectTime = time.Now()
|
||
wm.cancelFunc = newCancel
|
||
wm.mu.Unlock()
|
||
|
||
log.Infof("✅ 替换连接成功: %s listenKey: %s", wm.apiKey, newListenKey)
|
||
|
||
// 步骤 4：启动新连接协程
|
||
go wm.startListenKeyRenewal2(newCtx)
|
||
go wm.readMessages(newCtx)
|
||
go wm.handleReconnect(newCtx)
|
||
go wm.startPingLoop(newCtx)
|
||
// go wm.startDeadCheck(newCtx)
|
||
|
||
// 步骤 5：关闭旧连接、取消旧协程
|
||
if oldCtxCancel != nil {
|
||
oldCtxCancel()
|
||
}
|
||
if oldConn != nil {
|
||
_ = oldConn.Close()
|
||
log.Infof("🔒 旧连接已关闭: %s", wm.apiKey)
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// 更新最后通信时间
|
||
func setLastTime(wm *BinanceWebSocketManager) {
|
||
subKey := fmt.Sprintf(global.USER_SUBSCRIBE, wm.apiKey)
|
||
val, _ := helper.DefaultRedis.GetString(subKey)
|
||
now := time.Now()
|
||
var data binancedto.UserSubscribeState
|
||
if val != "" {
|
||
sonic.Unmarshal([]byte(val), &data)
|
||
}
|
||
|
||
if wm.wsType == 0 {
|
||
data.SpotLastTime = &now
|
||
} else {
|
||
data.FuturesLastTime = &now
|
||
}
|
||
|
||
val, _ = sonic.MarshalString(&data)
|
||
|
||
if val != "" {
|
||
helper.DefaultRedis.SetString(subKey, val)
|
||
}
|
||
|
||
}
|
||
|
||
func (wm *BinanceWebSocketManager) getDialer() (*websocket.Dialer, error) {
|
||
if wm.proxyAddress == "" {
|
||
return &websocket.Dialer{}, nil
|
||
}
|
||
|
||
if !strings.HasPrefix(wm.proxyAddress, "http://") && !strings.HasPrefix(wm.proxyAddress, "https://") && !strings.HasPrefix(wm.proxyAddress, "socks5://") {
|
||
wm.proxyAddress = wm.proxyType + "://" + wm.proxyAddress
|
||
}
|
||
|
||
proxyURL, err := url.Parse(wm.proxyAddress)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("failed to parse proxy URL: %v", err)
|
||
}
|
||
|
||
transport := &http.Transport{
|
||
TLSClientConfig: &tls.Config{InsecureSkipVerify: false},
|
||
}
|
||
|
||
switch proxyURL.Scheme {
|
||
case "socks5":
|
||
return wm.createSocks5Dialer(proxyURL)
|
||
case "http", "https":
|
||
transport.Proxy = http.ProxyURL(proxyURL)
|
||
return &websocket.Dialer{Proxy: transport.Proxy, TLSClientConfig: transport.TLSClientConfig}, nil
|
||
default:
|
||
return nil, fmt.Errorf("unsupported proxy scheme: %s", proxyURL.Scheme)
|
||
}
|
||
}
|
||
|
||
func (wm *BinanceWebSocketManager) createSocks5Dialer(proxyURL *url.URL) (*websocket.Dialer, error) {
|
||
auth := &proxy.Auth{}
|
||
if proxyURL.User != nil {
|
||
auth.User = proxyURL.User.Username()
|
||
auth.Password, _ = proxyURL.User.Password()
|
||
}
|
||
|
||
socksDialer, err := proxy.SOCKS5("tcp", proxyURL.Host, auth, proxy.Direct)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("failed to create SOCKS5 proxy dialer: %v", err)
|
||
}
|
||
|
||
return &websocket.Dialer{
|
||
NetDialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
|
||
return socksDialer.Dial(network, address)
|
||
},
|
||
}, nil
|
||
}
|
||
|
||
// 复用创建HTTP客户端的逻辑
|
||
func (wm *BinanceWebSocketManager) createBinanceClient() (*helper.BinanceClient, error) {
|
||
return helper.NewBinanceClient(wm.apiKey, wm.apiSecret, wm.proxyType, wm.proxyAddress)
|
||
}
|
||
|
||
// 获取listenKey
|
||
func (wm *BinanceWebSocketManager) getListenKey() (string, error) {
|
||
client, err := wm.createBinanceClient()
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
|
||
var resp []byte
|
||
switch wm.wsType {
|
||
case 0:
|
||
resp, _, err = client.SendSpotRequestByKey("/api/v3/userDataStream", "POST", nil)
|
||
case 1:
|
||
resp, _, err = client.SendFuturesRequestByKey("/fapi/v1/listenKey", "POST", nil)
|
||
|
||
default:
|
||
log.Error("链接类型错误")
|
||
return "", errors.New("链接类型错误")
|
||
}
|
||
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
|
||
var dataMap map[string]interface{}
|
||
if err := sonic.Unmarshal(resp, &dataMap); err != nil {
|
||
return "", err
|
||
}
|
||
|
||
if listenKey, ok := dataMap["listenKey"]; ok {
|
||
return listenKey.(string), nil
|
||
}
|
||
|
||
return "", errors.New("listenKey 不存在")
|
||
}
|
||
|
||
// 接收消息
|
||
func (wm *BinanceWebSocketManager) readMessages(ctx context.Context) {
|
||
defer wm.ws.Close()
|
||
|
||
for {
|
||
select {
|
||
case <-ctx.Done():
|
||
return
|
||
default:
|
||
if wm.isStopped {
|
||
return
|
||
}
|
||
|
||
_, msg, err := wm.ws.ReadMessage()
|
||
if err != nil && strings.Contains(err.Error(), "websocket: close") {
|
||
if !wm.isStopped {
|
||
log.Error("收到关闭消息", err.Error())
|
||
wm.triggerReconnect(false)
|
||
}
|
||
|
||
log.Error("websocket 关闭")
|
||
return
|
||
} else if err != nil {
|
||
log.Error("读取消息时出错: %v", err)
|
||
return
|
||
}
|
||
wm.handleOrderUpdate(msg)
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
func (wm *BinanceWebSocketManager) handleOrderUpdate(msg []byte) {
|
||
setLastTime(wm)
|
||
|
||
if reconnect, _ := ReceiveListen(msg, wm.wsType, wm.apiKey); reconnect {
|
||
log.Errorf("收到重连请求")
|
||
wm.triggerReconnect(false)
|
||
}
|
||
}
|
||
|
||
func (wm *BinanceWebSocketManager) Stop() {
|
||
wm.mu.Lock()
|
||
defer wm.mu.Unlock()
|
||
|
||
if wm.isStopped {
|
||
return
|
||
}
|
||
|
||
wm.isStopped = true
|
||
// 关闭 stopChannel（确保已经关闭，避免 panic）
|
||
select {
|
||
case <-wm.stopChannel:
|
||
default:
|
||
close(wm.stopChannel)
|
||
}
|
||
|
||
if wm.cancelFunc != nil {
|
||
wm.cancelFunc()
|
||
}
|
||
|
||
if wm.ws != nil {
|
||
if err := wm.ws.Close(); err != nil {
|
||
log.Error(fmt.Sprintf("key【%s】close失败", wm.apiKey), err)
|
||
} else {
|
||
log.Info(fmt.Sprintf("key【%s】close", wm.apiKey))
|
||
}
|
||
}
|
||
|
||
// **重新创建 stopChannel，避免 Restart() 时无效**
|
||
wm.stopChannel = make(chan struct{})
|
||
}
|
||
|
||
// 重连机制
|
||
func (wm *BinanceWebSocketManager) handleReconnect(ctx context.Context) {
|
||
maxRetries := 5 // 最大重试次数
|
||
retryCount := 0
|
||
|
||
for {
|
||
select {
|
||
case <-ctx.Done():
|
||
return
|
||
case <-wm.reconnect:
|
||
if wm.isStopped {
|
||
return
|
||
}
|
||
|
||
log.Warn("WebSocket 连接断开，尝试重连...")
|
||
|
||
if wm.ws != nil {
|
||
wm.ws.Close()
|
||
}
|
||
|
||
// 取消旧的上下文
|
||
if wm.cancelFunc != nil {
|
||
wm.cancelFunc()
|
||
}
|
||
|
||
for {
|
||
newCtx, cancel := context.WithCancel(context.Background())
|
||
wm.cancelFunc = cancel // 更新 cancelFunc
|
||
|
||
if err := wm.connect(newCtx); err != nil {
|
||
log.Errorf("重连失败: %v", err)
|
||
cancel()
|
||
retryCount++
|
||
|
||
if retryCount >= maxRetries {
|
||
wm.reconnecting.Store(false)
|
||
log.Error("重连失败次数过多，退出重连逻辑")
|
||
return
|
||
}
|
||
|
||
time.Sleep(5 * time.Second)
|
||
continue
|
||
}
|
||
|
||
// 重连成功，清除标记
|
||
wm.reconnecting.Store(false)
|
||
retryCount = 0
|
||
return
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 假死检测
|
||
func (wm *BinanceWebSocketManager) DeadCheck() {
|
||
subKey := fmt.Sprintf(global.USER_SUBSCRIBE, wm.apiKey)
|
||
val, _ := helper.DefaultRedis.GetString(subKey)
|
||
if val == "" {
|
||
log.Warnf("没有订阅信息，无法进行假死检测")
|
||
return
|
||
}
|
||
|
||
var data binancedto.UserSubscribeState
|
||
_ = sonic.Unmarshal([]byte(val), &data)
|
||
|
||
var lastTime *time.Time
|
||
if wm.wsType == 0 {
|
||
lastTime = data.SpotLastTime
|
||
} else {
|
||
lastTime = data.FuturesLastTime
|
||
}
|
||
|
||
// 定义最大静默时间（超出视为假死）
|
||
var timeout time.Duration
|
||
if wm.wsType == 0 {
|
||
timeout = 40 * time.Second // Spot 每 20s ping，40s 足够
|
||
} else {
|
||
timeout = 6 * time.Minute // Futures 每 3 分钟 ping
|
||
}
|
||
|
||
if lastTime != nil && time.Since(*lastTime) > timeout {
|
||
log.Warnf("检测到假死连接 key:%s type:%v, 距离上次通信: %v, 触发重连", wm.apiKey, wm.wsType, time.Since(*lastTime))
|
||
wm.triggerReconnect(true)
|
||
}
|
||
}
|
||
|
||
// 主动心跳发送机制
|
||
func (wm *BinanceWebSocketManager) startPingLoop(ctx context.Context) {
|
||
ticker := time.NewTicker(1 * time.Minute)
|
||
defer ticker.Stop()
|
||
|
||
for {
|
||
select {
|
||
case <-ctx.Done():
|
||
return
|
||
case <-ticker.C:
|
||
if wm.isStopped {
|
||
return
|
||
}
|
||
err := wm.ws.WriteMessage(websocket.PingMessage, []byte("ping"))
|
||
if err != nil {
|
||
log.Error("主动 Ping Binance 失败:", err)
|
||
wm.triggerReconnect(false)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 定期删除listenkey 并重启ws
|
||
// func (wm *BinanceWebSocketManager) startListenKeyRenewal(ctx context.Context, listenKey string) {
|
||
// time.Sleep(30 * time.Minute)
|
||
|
||
// select {
|
||
// case <-ctx.Done():
|
||
// return
|
||
// default:
|
||
// if err := wm.deleteListenKey(listenKey); err != nil {
|
||
// log.Error("Failed to renew listenKey: ,type:%v key: %s", wm.wsType, wm.apiKey, err)
|
||
// } else {
|
||
// log.Debug("Successfully delete listenKey")
|
||
// wm.triggerReconnect()
|
||
// }
|
||
// }
|
||
|
||
// }
|
||
|
||
// 定时续期
|
||
func (wm *BinanceWebSocketManager) startListenKeyRenewal2(ctx context.Context) {
|
||
ticker := time.NewTicker(30 * time.Minute)
|
||
defer func() {
|
||
log.Debug("定时续期任务退出 key:", wm.apiKey)
|
||
ticker.Stop()
|
||
}()
|
||
|
||
for {
|
||
select {
|
||
case <-ticker.C:
|
||
if wm.isStopped {
|
||
return
|
||
}
|
||
|
||
if err := wm.renewListenKey(wm.listenKey); err != nil {
|
||
log.Error("Failed to renew listenKey: ,type:%v key: %s", wm.wsType, wm.apiKey, err)
|
||
}
|
||
case <-ctx.Done():
|
||
return
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
删除listenkey
|
||
*/
|
||
// func (wm *BinanceWebSocketManager) deleteListenKey(listenKey string) error {
|
||
// client, err := wm.createBinanceClient()
|
||
// if err != nil {
|
||
// return err
|
||
// }
|
||
|
||
// var resp []byte
|
||
|
||
// switch wm.wsType {
|
||
// case 0:
|
||
// path := fmt.Sprintf("/api/v3/userDataStream")
|
||
// params := map[string]interface{}{
|
||
// "listenKey": listenKey,
|
||
// }
|
||
// resp, _, err = client.SendSpotRequestByKey(path, "DELETE", params)
|
||
|
||
// log.Debug(fmt.Sprintf("deleteListenKey resp: %s", string(resp)))
|
||
// case 1:
|
||
// resp, _, err = client.SendFuturesRequestByKey("/fapi/v1/listenKey", "DELETE", nil)
|
||
// log.Debug(fmt.Sprintf("deleteListenKey resp: %s", string(resp)))
|
||
// default:
|
||
// return errors.New("unknown ws type")
|
||
// }
|
||
|
||
// return err
|
||
// }
|
||
|
||
func (wm *BinanceWebSocketManager) renewListenKey(listenKey string) error {
|
||
client, err := wm.createBinanceClient()
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
var resp []byte
|
||
|
||
switch wm.wsType {
|
||
case 0:
|
||
path := fmt.Sprintf("/api/v3/userDataStream?listenKey=%s", listenKey)
|
||
resp, _, err = client.SendSpotRequestByKey(path, "PUT", nil)
|
||
log.Debug(fmt.Sprintf("renewListenKey resp: %s", string(resp)))
|
||
case 1:
|
||
// path := fmt.Sprintf("/fapi/v1/listenKey", listenKey)
|
||
resp, _, err = client.SendFuturesRequestByKey("/fapi/v1/listenKey", "PUT", nil)
|
||
log.Debug(fmt.Sprintf("renewListenKey resp: %s", string(resp)))
|
||
default:
|
||
return errors.New("unknown ws type")
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func getWsTypeName(wsType int) string {
|
||
switch wsType {
|
||
case 0:
|
||
return "spot"
|
||
case 1:
|
||
return "futures"
|
||
default:
|
||
return "unknown"
|
||
}
|
||
}
|
||
func getUUID() string {
|
||
return fmt.Sprintf("%s-%s-%s-%s-%s", randomHex(8), randomHex(4), randomHex(4), randomHex(4), randomHex(12))
|
||
}
|
||
|
||
func randomHex(n int) string {
|
||
rand.New(rand.NewSource(time.Now().UnixNano()))
|
||
hexChars := "0123456789abcdef"
|
||
bytes := make([]byte, n)
|
||
for i := 0; i < n; i++ {
|
||
bytes[i] = hexChars[rand.Intn(len(hexChars))]
|
||
}
|
||
return string(bytes)
|
||
}
|