grpc的负载均衡

一.grpc的负载均衡介绍

1.官网地址

https://github.com/grpc/grpc/blob/master/doc/load-balancing.md

2.架构

 

3. Name Resolver（grpc从consul中同步服务信息进行负载均衡）

作用：从指定的DNS服务器或者一个注册中心拉取数据到本地来

目前已经有人已经做好此方面的功能，直接使用即可

官方文档介绍：https://github.com/mbobakov/grpc-consul-resolver

使用示例：

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package main   import (     "time"     "log"       _ "github.com/mbobakov/grpc-consul-resolver" // It's important       "google.golang.org/grpc" )   func main() {     conn, err := grpc.Dial(         "consul://127.0.0.1:8500/whoami?wait=14s&tag=manual",         grpc.WithInsecure(),         grpc.WithDefaultServiceConfig(`{"loadBalancingPolicy": "round_robin"}`),     )     if err != nil {         log.Fatal(err)     }     defer conn.Close()     ... }

　　

4.gin中集成

在initialize下的srv_conn.go初始化配置中配置如下即可 InitSrvConn

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package initialize   import (     "fmt"     "github.com/hashicorp/consul/api"     "go.uber.org/zap"     "google.golang.org/grpc"     "google.golang.org/grpc/credentials/insecure"     "mxshop-api/user-web/global"     "mxshop-api/user-web/proto"       _ "github.com/mbobakov/grpc-consul-resolver" // It's important )   func InitSrvConn() {     userConn, err := grpc.Dial(         fmt.Sprintf("consul://%s:%d/%s?wait=14s", global.ServerConfig.ConsulInfo.Host, global.ServerConfig.ConsulInfo.Port, global.ServerConfig.UserSrvInfo.Name),         //grpc.WithInsecure(),         grpc.WithTransportCredentials(insecure.NewCredentials()),         grpc.WithDefaultServiceConfig(`{"loadBalancingPolicy": "round_robin"}`),     )     if err != nil {         zap.S().Fatal("【InitSrvConn】链接【用户失败】")     }     userSrvClient := proto.NewUserClient(userConn)       global.UserSrvClient = userSrvClient }   func InitSrvConn2() {     //从注册中心获取到用户服务的信息     cfg := api.DefaultConfig()     cfg.Address = "127.0.0.1:8500"       //zap.S().Infof(fmt.Sprintf("配置：%s", global.ServerConfig.ConsulInfo.Host))     cfg.Address = fmt.Sprintf("%s:%d", global.ServerConfig.ConsulInfo.Host, global.ServerConfig.ConsulInfo.Port)       userSrvHost := ""     userSrvPost := 0       client, err := api.NewClient(cfg)     if err != nil {         panic(err)     }       data, err := client.Agent().ServicesWithFilter(fmt.Sprintf(`Service == "%s"`, global.ServerConfig.UserSrvInfo.Name))     //data, err := client.Agent().ServicesWithFilter(fmt.Sprintf("Service == \"%s\"", global.ServerConfig.UserSrvInfo.Name))       if err != nil {         panic(err)     }     for _, value := range data {         userSrvHost = value.Address         userSrvPost = value.Port         break     }       if userSrvHost == "" {         zap.S().Fatal("【InitSrvConn】链接【用户失败】")     }     //拨号连接用户RPC服务     userConn, err := grpc.Dial(fmt.Sprintf("%s:%d", userSrvHost, userSrvPost), grpc.WithTransportCredentials(insecure.NewCredentials()))     if err != nil {         zap.S().Errorw("[GetUserList]连接失败【用户服务失败】", "msg", err.Error())     }       //1. 后续的用户服务下线了 2. 改端口了 3. 改ip了 负载均衡来做       //2. 已经事先创立好了连接，这样后续就不用进行再次tcp的三次握手     //3. 一个连接多个groutine共用，性能 - 连接池       userSrvClient := proto.NewUserClient(userConn)       global.UserSrvClient = userSrvClient }