SpringCloud 融入 Python - Tornado

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

end