Spring Cloud Alibaba Sidecar 多语言微服务异构

Spring Cloud Alibaba Sidecar 介绍

自Spring Cloud Alibaba 2.1.1版本后增加了spring-cloud-alibaba-sidecar模块作为一个代理的服务来间接性的让其他语言可以使用spring cloud alibaba等相关组件。通过与网关来进行路由的映射，从而可以做到服务的获取，然后可以使用Ribbon间接性调用。

如上图，Spring Cloud应用请求sidercar然后转发给其他语言的模块，优势是对于异构服务代码零侵入，不需要直接根据nacos或其他注册中心api注册等

使用入门

构建其他语言接口服务

• 基于go写个简单的服务接口

http://127.0.0.1:8089/sidecar

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/sidecar", sidecar)
    http.HandleFunc("/heath", health)
    log.Fatal(http.ListenAndServe(":8089", nil))
}
func sidecar(w http.ResponseWriter, r *http.Request) {
    _, _ = fmt.Fprintf(w, "hello spring cloud alibaba sidecar")
}

func health(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    actuator := make(map[string]string)
    actuator["status"] = "UP"
    _ = json.NewEncoder(w).Encode(actuator)
}

构建 sidercar 应用

• 增加sidecar依赖

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sidecar</artifactId>
    <version>2.1.1.RELEASE</version>
</dependency>

• 配置application.yml

server:
  port: 8088
spring:
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  application:
    name: go-provider

# 配置异构服务
sidecar:
  ip: localhost
  port: 8089
  health-check-url: http://localhost:8089/health

构建 nacos consumer应用

• application.yml

server:
  port: 8087
spring:
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
  application:
    name: nacos-consumer

• consumer逻辑

@RestController
@EnableDiscoveryClient
@SpringBootApplication
public class NacosConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosConsumerApplication.class, args);
    }

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/test")
    public String test() {
        return restTemplate.getForObject("http://go-provider/sidecar", String.class);
    }

}

测试使用

• 访问spring cloud consumer应用

curl http://localhost:8087/test   

• 输出go-provider应用

hello spring cloud alibaba sidecar