SpringCloud融入Python的实现

前言

该篇文章分享如何将Python Web服务融入到Spring Cloud微服务体系中，并调用其服务，Python Web框架用的是Tornado

构建Python web服务

引入py-eureka-client客户端

pip install py_eureka_client

manage.py

#!/usr/bin/env python
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import py_eureka_client.eureka_client as eureka_client
from tornado.options import define, options
from time import sleep

define("port", default=3333, help="run on the given port", type=int)

class IndexHandler(tornado.web.RequestHandler):
  def get(self):
    username = self.get_argument('username', 'Hello')
    self.write(username + ', Administrator User!')

  def post(self):
    username = self.get_argument('username', 'Hello')
    self.write(username + ', Administrator User!')

class MainHandler(tornado.web.RequestHandler):
  def get(self):
    username = self.get_argument('username', 'Hello')
    self.write(username + ', Coisini User!')

  def post(self):
    username = self.get_argument('username', 'Hello')
    self.write(username + ', Coisini User!')

def main():
  tornado.options.parse_command_line()
  # 注册eureka服务
  eureka_client.init_registry_client(eureka_server="http://localhost:31091/eureka/,http://localhost:8761/eureka/",
                    app_name="python-tornado",
                    instance_port=3333)
  app = tornado.web.Application(handlers=[(r"/test", IndexHandler), (r"/main", MainHandler)])
  http_server = tornado.httpserver.HTTPServer(app)
  http_server.listen(options.port)
  tornado.ioloop.IOLoop.instance().start()

if __name__ == '__main__':
  main()

大致说下上述代码，向端口为31091的注册中心注册服务名为python-tornado的服务，端口为3333，提供两个请求方式为GET和POST，接口路径为/test和/main的外部调用接口

启动python服务(在此之前要创建一个Eureka服务注册中心)

python manage.py runserver

运行结果

服务调用(Feign) - Feign用于便捷调用HTTP API

congfig类中需添加注解@EnableFeignClients，具体使用请百度

TestController.java

@RestController
public class TestController {
  private TestAPIClient testAPIClient;

  @Autowired
  public TestController(TestAPIClient testAPIClient) {
    this.testAPIClient = testAPIClient;
  }

  @PostMapping("/test")
  public String test(@RequestParam String username) throws Exception {
    return this.testAPIClient.test(username);
  }

  @GetMapping("/test")
  public String test1() throws Exception {
    return this.testAPIClient.test1();
  }
}

TestAPIClient.java

@FeignClient(name="python-tornado", configuration = FeignConfigure.class)
public interface TestAPIClient {
  @PostMapping("/test")
  String test(@RequestParam("username") String username);

  @GetMapping("/test")
  String test1();
}

FeignConfigure.java

import feign.Logger;
import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.cloud.netflix.feign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FeignConfigure {
  @Bean
  Logger.Level feignLoggerLevel() {
    return Logger.Level.FULL;
  }

  @Autowired
  private ObjectFactory<HttpMessageConverters> messageConverters;

  @Bean
  public Encoder feignFormEncoder() {
    return new SpringFormEncoder(new SpringEncoder(messageConverters));
  }
}

Feign依赖

<!-- Feign Client -->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
  <groupId>io.github.openfeign.form</groupId>
  <artifactId>feign-form</artifactId>
  <version>3.4.1</version>
</dependency>
<dependency>
  <groupId>io.github.openfeign.form</groupId>
  <artifactId>feign-form-spring</artifactId>
  <version>3.4.1</version>
</dependency>

运行结果

在这里，我们用请求工具Postman来测试一下，可以看出，由TestController调用TestAPIClient再调用Python服务，至此，已完成微服务调用Python Web服务

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