feat: LeoMoeAPI 优选 IP

 要提交的变更：
	修改：     wshandle/client.go
	新文件：   wshandle/latency.go

wshandle/client.go

@@ -1,10 +1,14 @@
 package wshandle
 
 import (
+	"crypto/tls"
 	"log"
+	"net"
+	"net/http"
 	"net/url"
 	"os"
 	"os/signal"
+	"strings"
 	"sync"
 	"time"
 
@@ -27,14 +31,20 @@ var wsconn *WsConn
 
 // 读取hostp环境变量
 var hostP = GetenvDefault("NEXTTRACE_HOSTPORT", "api.leo.moe")
+var host, port, fast_ip string
 
 func (c *WsConn) keepAlive() {
 	go func() {
 		// 开启一个定时器
 		for {
 			<-time.After(time.Second * 54)
 			if c.Connected {
-				c.Conn.WriteMessage(websocket.TextMessage, []byte("ping"))
+				err := c.Conn.WriteMessage(websocket.TextMessage, []byte("ping"))
+				if err != nil {
+					log.Println(err)
+					c.Connected = false
+					return
+				}
 			}
 		}
 	}()
@@ -107,10 +117,16 @@ func (c *WsConn) messageSendHandler() {
 }
 
 func (c *WsConn) recreateWsConn() {
-	u := url.URL{Scheme: "wss", Host: hostP, Path: "/v2/ipGeoWs"}
+	u := url.URL{Scheme: "wss", Host: fast_ip + ":" + port, Path: "/v2/ipGeoWs"}
 	// log.Printf("connecting to %s", u.String())
-
-	ws, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
+	requestHeader := http.Header{
+		"Host": []string{host},
+	}
+	dialer := websocket.DefaultDialer
+	dialer.TLSClientConfig = &tls.Config{
+		ServerName: host,
+	}
+	ws, _, err := websocket.DefaultDialer.Dial(u.String(), requestHeader)
 	c.Conn = ws
 	if err != nil {
 		log.Println("dial:", err)
@@ -131,11 +147,47 @@ func createWsConn() *WsConn {
 	// 设置终端中断通道
 	interrupt := make(chan os.Signal, 1)
 	signal.Notify(interrupt, os.Interrupt)
+	// 解析域名
+	hostArr := strings.Split(hostP, ":")
+	// 判断是否有指定端口
+	if len(hostArr) > 1 {
+		// 判断是否为 IPv6
+		if strings.HasPrefix(hostP, "[") {
+			tmp := strings.Split(hostP, "]")
+			host = tmp[0]
+			host = host[1:]
+			if port = tmp[1]; port != "" {
+				port = port[1:]
+			}
+		} else {
+			host, port = hostArr[0], hostArr[1]
+		}
+	} else {
+		host = hostP
+	}
+	if port == "" {
+		// 默认端口
+		port = "443"
+	}
+	// 默认配置完成，开始寻找最优 IP
+	fast_ip = GetFastIP(host, port)
 
-	u := url.URL{Scheme: "wss", Host: hostP, Path: "/v2/ipGeoWs"}
+	// 如果 host 是一个 IP 使用默认域名
+	if valid := net.ParseIP(host); valid != nil {
+		host = "api.leo.moe"
+	}
+	// 判断是否是一个 IP
+	requestHeader := http.Header{
+		"Host": []string{host},
+	}
+	dialer := websocket.DefaultDialer
+	dialer.TLSClientConfig = &tls.Config{
+		ServerName: host,
+	}
+	u := url.URL{Scheme: "wss", Host: fast_ip + ":" + port, Path: "/v2/ipGeoWs"}
 	// log.Printf("connecting to %s", u.String())
 
-	c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
+	c, _, err := websocket.DefaultDialer.Dial(u.String(), requestHeader)
 
 	wsconn = &WsConn{
 		Conn:         c,

wshandle/latency.go

@@ -0,0 +1,71 @@
+package wshandle
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/fatih/color"
+)
+
+var (
+	result  string
+	results = make(chan string)
+)
+
+func GetFastIP(domain string, port string) string {
+
+	ips, err := net.LookupIP(domain)
+	if err != nil {
+		log.Fatal("DNS 解析失败，请检查您的系统 DNS 设置")
+		return ""
+	}
+
+	for _, ip := range ips {
+		go checkLatency(ip.String(), port)
+	}
+
+	select {
+	case result = <-results:
+	case <-time.After(1 * time.Second):
+
+	}
+	if result == "" {
+		log.Fatal("IP 连接均超时，请检查您的网络")
+	}
+	res := strings.Split(result, "-")
+
+	if len(ips) > 1 {
+		_, _ = fmt.Fprintf(color.Output, "%s 已为您优选最近的节点 %s - %s\n",
+			color.New(color.FgWhite, color.Bold).Sprintf("[NextTrace API]"),
+			color.New(color.FgGreen, color.Bold).Sprintf("%s", res[0]),
+			color.New(color.FgCyan, color.Bold).Sprintf("%sms", res[1]),
+		)
+	}
+
+	return res[0]
+}
+
+func checkLatency(ip string, port string) {
+	start := time.Now()
+	if !strings.Contains(ip, ".") {
+		ip = "[" + ip + "]"
+	}
+	conn, err := net.DialTimeout("tcp", ip+":"+port, time.Second*1)
+	if err != nil {
+		return
+	}
+	defer func(conn net.Conn) {
+		err := conn.Close()
+		if err != nil {
+			return
+		}
+	}(conn)
+	if result == "" {
+		result = fmt.Sprintf("%s-%.2f", ip, float64(time.Since(start))/float64(time.Millisecond))
+		results <- result
+		return
+	}
+}