API节点自动生成实例代号，用来外界查询多个API节点实例是否为同一个

internal/const/vars.go

@@ -2,9 +2,18 @@
 
 package teaconst
 
-var (
-	IsPlus         = false
-	MaxNodes int32 = 0
-	NodeId   int64 = 0
-	Debug          = false
+import (
+	"crypto/sha1"
+	"fmt"
+	"github.com/iwind/TeaGo/rands"
+	"github.com/iwind/TeaGo/types"
+	"time"
+)
+
+var (
+	IsPlus             = false
+	MaxNodes     int32 = 0
+	NodeId       int64 = 0
+	Debug              = false
+	InstanceCode       = fmt.Sprintf("%x", sha1.Sum([]byte("INSTANCE"+types.String(time.Now().UnixNano())+"@"+types.String(rands.Int64()))))
 )