初始化提交

mengyamonitor-backend/latency.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+// LatencyInfo 延迟信息
+type LatencyInfo struct {
+	ClientToServer float64            `json:"clientToServer"` // 客户端到服务器延迟（ms），由前端计算
+	External       map[string]string `json:"external"`        // 外部网站延迟
+}
+
+// checkExternalLatency 检测外部网站延迟
+func checkExternalLatency(host string, timeout time.Duration) string {
+	start := time.Now()
+	
+	// 尝试 TCP 连接 80 端口
+	conn, err := net.DialTimeout("tcp", host+":80", timeout)
+	if err != nil {
+		// 如果 80 端口失败，尝试 443 (HTTPS)
+		conn, err = net.DialTimeout("tcp", host+":443", timeout)
+		if err != nil {
+			return "超时"
+		}
+	}
+	defer conn.Close()
+	
+	latency := time.Since(start).Milliseconds()
+	
+	// 检查是否超时（超过超时时间的一半就认为可能有问题）
+	if latency > timeout.Milliseconds()/2 {
+		return "超时"
+	}
+	
+	return fmt.Sprintf("%d ms", latency)
+}
+
+// readExternalLatencies 读取外部网站延迟
+func readExternalLatencies() map[string]string {
+	latencies := make(map[string]string)
+	timeout := 3 * time.Second
+
+	// 检测百度
+	latencies["baidu.com"] = checkExternalLatency("baidu.com", timeout)
+
+	// 检测谷歌
+	latencies["google.com"] = checkExternalLatency("google.com", timeout)
+
+	// 检测 GitHub
+	latencies["github.com"] = checkExternalLatency("github.com", timeout)
+
+	return latencies
+}
+