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6.Ros2系列课程之-Python编写服务端引用自定义服务接口

  • 2026-07-02 21:35:13
6.Ros2系列课程之-Python编写服务端引用自定义服务接口

上期我们成功创建了自定义的天气查询服务接口(GetWeather.srv)。今天,我们将把这个接口用起来,用 Python 编写服务端(Server),让它真正能够提供天气查询服务!🌦️


🛠️ 一、创建 ROS2 服务端步骤

用 Python 编写服务端,通常遵循以下 4 个标准步骤:

  1. 导入服务接口:引入我们上期自定义的消息类型 GetWeather

  2. 创建服务端回调函数:定义一个函数,用于处理客户端的请求。

  3. 声明并创建服务端:在节点中注册这个服务。

  4. 编写回调函数逻辑:在函数中实现具体的业务逻辑(比如随机生成天气)。


🐍 二、Python 服务端代码编写

假设我们在 weather_py_server功能包中,创建weather_py_server.py

1. 完整代码

import randomimport rclpyfrom rclpy.node import Node# 1. 导入自定义的服务接口from weather_service_demo.srv import GetWeatherclass WeatherServer(Node):    def __init__(self):        super().__init__('weather_server')        # 3. 声明并创建服务端        self.srv = self.create_service(            GetWeather,            'get_weather',            self.get_weather_callback)        self.get_logger().info('Weather Server is ready.')    # 2. 创建服务端回调函数    def get_weather_callback(self, request, response):        # 4. 编写回调函数逻辑        self.get_logger().info(f'Received request for date: {request.date}')        # 模拟根据日期返回不同的天气(这里随机生成)        weather_options = ['Sunny''Rainy''Cloudy''Snowy']        response.weather_status = random.choice(weather_options)        self.get_logger().info(f'Sending back response: {response.weather_status}')        return responsedef main(args=None):    rclpy.init(args=args)    weather_server = WeatherServer()    rclpy.spin(weather_server)    weather_server.destroy_node()    rclpy.shutdown()if __name__ == '__main__':    main()

2. 修改配置文件增加依赖,明确指出服务端的代码,依赖于上文写的自定义服务接口。


🧪 三、Python 服务端通信测试

代码写好后,我们需要验证服务端是否能正常工作。

1. 编译与运行

首先确保环境变量已设置,然后运行服务端:

# 终端1cd ~/your_workspacecolcon buildsource install/setup.bashros2 run weather_py_server weather_server

看到日志输出 Weather Server is ready.,说明服务端已上线。

2. 用命令行测试

打开一个新的终端,使用 ros2 service call命令发送请求:

# 终端2ros2 service call /get_weather weather_service_demo/srv/GetWeather "{date: '2024-12-25'}"

如果一切正常,你会立刻收到服务端的回复,比如:

response:weather_status: Sunny

3. 用 rqt 工具测试

rqt是更直观的图形化测试工具。

  1. 打开终端输入 rqt

  2. 选择 Plugins-> Services-> Service Caller

  3. 在下拉框选择 /get_weather服务。

  4. 在 date输入框填写 2024-12-25,点击 Call

  5. 右侧会显示返回的 weather_status


📢 下期预告

服务端已经准备好了,但总不能每次都靠人工敲命令来查询天气吧?下期我们将编写 Python 客户端(Client),让程序自动去请求服务!🚀

💬 互动一下:

你觉得在服务端代码中,除了随机选择天气,还可以加入哪些有趣的逻辑(比如根据日期判断季节)?欢迎在评论区分享你的想法!👇

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  1. CONNECT:[ UseTime:0.000710s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000872s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000365s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000317s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000540s ]
  6. SELECT * FROM `set` [ RunTime:0.000211s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000531s ]
  8. SELECT * FROM `article` WHERE `id` = 498077 LIMIT 1 [ RunTime:0.000446s ]
  9. UPDATE `article` SET `lasttime` = 1783052327 WHERE `id` = 498077 [ RunTime:0.010427s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000363s ]
  11. SELECT * FROM `article` WHERE `id` < 498077 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000522s ]
  12. SELECT * FROM `article` WHERE `id` > 498077 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003010s ]
  13. SELECT * FROM `article` WHERE `id` < 498077 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000828s ]
  14. SELECT * FROM `article` WHERE `id` < 498077 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001488s ]
  15. SELECT * FROM `article` WHERE `id` < 498077 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025017s ]
0.123054s