增加随机选取节点的方法

dispatch/abstract.go

@@ -0,0 +1,20 @@
+// Package dispatch...
+//
+// Description : dispatch...
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 2021-04-01 5:53 下午
+package dispatch
+
+import "github.com/go-developer/balance/define"
+
+// IDispatch 负载均衡的接口定义
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 2:44 下午 2021/4/1
+type IDispatch interface {
+	// Get 获取一个节点
+	Get(nodeList []*define.SeverNode) (string, *define.Error)
+}

dispatch/rand.go

@@ -0,0 +1,45 @@
+// Package dispatch...
+//
+// Description : dispatch...
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 2021-04-01 5:58 下午
+package dispatch
+
+import (
+	"fmt"
+	"math/rand"
+
+	"github.com/go-developer/balance/define"
+)
+
+// NewRand ...
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 6:51 下午 2021/4/1
+func NewRand() IDispatch {
+	return &Rand{}
+}
+
+// Rand 随机选择
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 6:01 下午 2021/4/1
+type Rand struct {
+}
+
+// Get 获取 host + 端口
+//
+// Author : go_developer@163.com<张德满>
+//
+// Date : 6:01 下午 2021/4/1
+func (r Rand) Get(nodeList []*define.SeverNode) (string, *define.Error) {
+	if len(nodeList) == 0 {
+		return "", define.NewError(define.ErrorTypeNodeListEmpty, "服务器可用节点为空")
+	}
+	node := nodeList[rand.Intn(len(nodeList))]
+	return fmt.Sprintf("%s:%d", node.Host, node.Port), nil
+}