Nameko is a framework for building microservices in Python.
The example requires RabbitMQ, because it’s using the Nameko built-in AMQP RPC features.
Nameko微服务框架基于RabbitMQ的RPC远程调用协议。
Django REST framework is a powerful and flexible toolkit for building Web APIs.
一、前提
安装并运行RabbitMQ
在开发环境中使用 RabbitMQ 最简单的方式就是运行其官方的 docker 容器。
(安装过程略)
docker run -d --hostname my-rabbit --name some-rabbit -p 15672:15672 -p 5672:5672 rabbitmq:management
如果运行docker时没有指定用户名和密码,则使用默认值【guest】
docker run -d --hostname my-rabbit --name rabbit -e RABBITMQ_DEFAULT_USER=user -e RABBITMQ_DEFAULT_PASS=password -p 15672:15672 -p 5672:5672 rabbitmq:management
网址:http://localhost:15672/
二、发布Nameko微服务 2.1、Install with Pip
2.2、Service codepip install nameko
from nameko.rpc import rpc
# A Nameko service is just a Python class
class ServiceRpc:
# 微服务名称
name = "service_rpc_hello"
@rpc
def hello(self, name):
return {"result": "Hello, {}!".format(name)}
2.3、Running a Service
2.3.1、使用命令参数指定RabbitMQ服务
nameko run --broker amqp://guest:guest@192.168.0.46 service_rpc
2.3.2、使用yaml配置文件指定RabbitMQ服务
nameko run --config rabbitmq.yaml service_rpc
rabbitmq.yaml 文件内容,如下:
AMQP_URI: 'pyamqp://guest:guest@192.168.0.46'
浏览器效果查看,如下:
from nameko.standalone.rpc import ClusterRpcProxy
config = {
'AMQP_URI': 'pyamqp://guest:guest@192.168.0.46'
}
if __name__ == '__main__':
with ClusterRpcProxy(config) as cluster_rpc:
# 同步调用
res = cluster_rpc.service_rpc_hello.hello("firstname")
print(res)
# 异步调用
res = cluster_rpc.service_rpc_hello.hello.call_async("asyname")
print(res.result())
三、Django调用Nameko微服务
创建Django官网示例mysite项目(略,参见:https://docs.djangoproject.com/zh-hans/2.0/intro/tutorial01/),示例代码使用DRF框架编写API接口。
# amqp地址
NAMEKO_CONFIG = {
'AMQP_URI': 'amqp://guest:guest@192.168.101.46'
}
# 设置连接超时
NAMEKO_TIMEOUT = 10
3.3、api.py 后台接口
在polls文件夹中,新建api.py
from django_nameko import get_pool
from rest_framework.response import Response
from rest_framework.decorators import action
from rest_framework.viewsets import ModelViewSet
class NamekoViewSet(ModelViewSet):
@action(detail=False, url_path='hello', methods=['GET'])
def hello_msg(self, request, *args, **kwargs):
name = self.request.query_params.get('name', 'world')
try:
with get_pool().next() as rpc:
res = rpc.service_rpc_hello.hello(name)
return Response({'result': 'hello {}!'.format(res)}, status=200)
except Exception as e:
print(e)
return Response({'result': 'hello world!'}, status=200)
@action(detail=False, url_path='hello_async', methods=['GET'])
def hello_async(self, request, *args, **kwargs):
name = self.request.query_params.get('name', 'world')
try:
with get_pool().next() as rpc:
res = rpc.service_rpc_hello.hello.call_async(name)
return Response(res.result(), status=200)
except Exception as e:
print(e)
return Response({'result': 'hello world!'}, status=200)
3.4、urls.py
在polls的urls.py文件中,配置如下:
from .api import NamekoViewSet
router = routers.DefaultRouter()
router.register(r'', NamekoViewSet, basename='api')
3.5、浏览器查看效果
启动django项目
python manage.py runserver 0.0.0.0:8001
浏览器访问hello_async网址
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