From 1bd203c5555046b7ee4fbfe2f822eb3d03571ad7 Mon Sep 17 00:00:00 2001
From: SergeiEU <39683682+SergeiEU@users.noreply.github.com>
Date: Wed, 1 Apr 2026 10:17:15 +0400
Subject: Initial import

---
 internal/sync/health.go | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 internal/sync/health.go

(limited to 'internal/sync/health.go')

diff --git a/internal/sync/health.go b/internal/sync/health.go
new file mode 100644
index 0000000..4d6ceca
--- /dev/null
+++ b/internal/sync/health.go
@@ -0,0 +1,33 @@
+package sync
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	"vpnem/internal/models"
+)
+
+// HealthCheck tests if a server's proxy port is reachable.
+func HealthCheck(server models.Server, timeout time.Duration) error {
+	addr := fmt.Sprintf("%s:%d", server.Server, server.ServerPort)
+	conn, err := net.DialTimeout("tcp", addr, timeout)
+	if err != nil {
+		return fmt.Errorf("server %s unreachable: %w", server.Tag, err)
+	}
+	conn.Close()
+	return nil
+}
+
+// FindHealthyServer returns the first healthy non-RU server from the list.
+func FindHealthyServer(servers []models.Server, timeout time.Duration) *models.Server {
+	for _, s := range servers {
+		if s.Region == "RU" {
+			continue
+		}
+		if err := HealthCheck(s, timeout); err == nil {
+			return &s
+		}
+	}
+	return nil
+}
-- 
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