增加加权负载轮询的实现

balance/abstract.go

@@ -22,7 +22,7 @@ type IBalance interface {
 	// GetServerNode 获取一个服务器节点
 	GetServerNode(req *http.Request) (*define.ServerNode, error)
 	// AddServerNode 新增一个服务器节点
-	AddServerNode(hostIP string, port int) error
+	AddServerNode(node *define.ServerNode) error
 	// Remove 移除一个节点
 	Remove(hostIP string, port int, force bool)
 	// GetServerNodeList 获取服务节点列表

balance/base.go

@@ -65,22 +65,18 @@ func (b *base) RUnlock() {
 // Author : go_developer@163.com<白茶清欢>
 //
 // Date : 10:07 下午 2021/10/20
-func (b *base) AddServerNode(hostIP string, port int) error {
-	if len(hostIP) == 0 || port <= 0 {
+func (b *base) AddServerNode(node *define.ServerNode) error {
+	if len(node.HostIP) == 0 || node.Port <= 0 {
 		return errors.New("host ip or port is invalid")
 	}
 	b.Lock()
 	defer b.Unlock()
 	for _, item := range b.severList {
-		if item.HostIP == hostIP && item.Port == port {
+		if item.HostIP == node.HostIP && item.Port == node.Port {
 			return errors.New("host config is already exist")
 		}
 	}
-	b.severList = append(b.severList, &define.ServerNode{
-		HostIP: hostIP,
-		Port:   port,
-		Status: define.ServerNodeStatusNormal,
-	})
+	b.severList = append(b.severList, node)
 	return nil
 }
 

balance/define/node.go

@@ -13,8 +13,9 @@ package define
 //
 // Date : 12:36 下午 2021/10/19
 type ServerNode struct {
-	HostIP string `json:"host_ip"` // 机器IP
-	Port   int    `json:"port"`    // 机器端口
-	Status int    `json:"status"`  // 机器状态
-	Weight int    `json:"weight"`  // 机器权重
+	HostIP        string  `json:"host_ip"`        // 机器IP
+	Port          int     `json:"port"`           // 机器端口
+	Status        int     `json:"status"`         // 机器状态
+	Weight        float64 `json:"weight"`         // 机器权重
+	CurrentWeight float64 `json:"current_weight"` // 当前权重
 }

balance/weight_serverRound_robin.go

@@ -0,0 +1,114 @@
+// Package balance...
+//
+// Description : balance...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2021-11-22 6:58 下午
+package balance
+
+import (
+	"net/http"
+	"sync"
+
+	"github.com/pkg/errors"
+
+	"git.zhangdeman.cn/zhangdeman/gopkg/balance/define"
+)
+
+// NewWeightServerRoundRobin ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 6:58 下午 2021/11/22
+func NewWeightServerRoundRobin(severList []*define.ServerNode) (IBalance, error) {
+	if nil == severList || len(severList) == 0 {
+		return nil, errors.New("sever list is empty")
+	}
+	return &WeightServerRoundRobin{
+		base: base{
+			lock:      &sync.RWMutex{},
+			severList: severList,
+		},
+		effectiveWeight: 0,
+	}, nil
+}
+
+// WeightServerRoundRobin 加权轮询
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 6:58 下午 2021/11/22
+type WeightServerRoundRobin struct {
+	base
+	effectiveWeight float64
+}
+
+// GetServerNode ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 7:00 下午 2021/11/22
+func (w *WeightServerRoundRobin) GetServerNode(req *http.Request) (*define.ServerNode, error) {
+	w.RLock()
+	defer w.RUnlock()
+	if len(w.severList) == 0 {
+		return nil, errors.New("sever list is empty")
+	}
+	var expectBackendServer *define.ServerNode
+	for _, backendServer := range w.severList {
+		// 给每个后端服务增加自身权重
+		backendServer.CurrentWeight += backendServer.Weight
+		if expectBackendServer == nil {
+			expectBackendServer = backendServer
+		}
+		if backendServer.CurrentWeight > expectBackendServer.CurrentWeight {
+			expectBackendServer = backendServer
+		}
+	}
+	// 把选择的后端服务权重减掉总权重
+	expectBackendServer.CurrentWeight -= w.effectiveWeight
+	return expectBackendServer, nil
+}
+
+// AddServerNode 新添加一个服务器节点
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 10:07 下午 2021/10/20
+func (w *WeightServerRoundRobin) AddServerNode(node *define.ServerNode) error {
+	if len(node.HostIP) == 0 || node.Port <= 0 {
+		return errors.New("host ip or port is invalid")
+	}
+	w.Lock()
+	defer w.Unlock()
+	for _, item := range w.severList {
+		if item.HostIP == node.HostIP && item.Port == node.Port {
+			return errors.New("host config is already exist")
+		}
+	}
+	w.effectiveWeight += node.Weight
+	w.severList = append(w.severList, node)
+	return nil
+}
+
+// Remove 移除一个节点, force = true , 强制删除, force = false 逻辑删除, 设置状态
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 10:19 下午 2021/10/20
+func (w *WeightServerRoundRobin) Remove(hostIP string, port int, force bool) {
+	w.Lock()
+	defer w.Unlock()
+	tmpServerNode := make([]*define.ServerNode, 0)
+	for _, item := range w.severList {
+		if item.HostIP == hostIP && item.Port == port {
+			if force {
+				continue
+			}
+			item.Status = define.ServerNodeStatusRemove
+		}
+		tmpServerNode = append(tmpServerNode, item)
+	}
+	w.severList = tmpServerNode
+}