微服务实践k8s&dapr开发部署实验（3）订阅发布
自托管模式运行dapr
新建订阅webapi项目,取名为backend
项目增加docker支持，取消https支持
修改Program.cs
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
//订阅需要用到以下方法
app.UseCloudEvents();
app.MapSubscribeHandler();
//if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseAuthorization();
app.MapControllers();
app.Run();
修改WeatherForecastController.cs
using Dapr;
using Microsoft.AspNetCore.Mvc;
namespace backend.Controllers
{
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
[HttpPost("TestSub")]
[Topic("pubsub", "deathStarStatus")]
public object TestSub([FromBody]string message)
{
Console.WriteLine($"TestSub deathStarStatus {message}");
return new { message = "TestSub deathStarStatus" };
}
}
}
Topic 就是确定接收的主题
修改launchSettings.json
将applicationUrl参数改为"http://localhost:5001"
在backend项目根目录下运行
dapr run --app-id backend --app-port 5001 dotnet run
新建发布事件webapi项目，取名为front
项目增加docker支持，取消https支持
修改Program.cs，增加dapr支持
修改WeatherForecastController.cs
using Dapr.Client;
using Microsoft.AspNetCore.Mvc;
namespace front.Controllers
{
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
private readonly DaprClient _daprClient;
public WeatherForecastController(DaprClient daprClient)
{
_daprClient = daprClient;
}
[HttpPost("TestPub")]
public async Task TestPub([FromBody]string msg)
{
try
{
await _daprClient.PublishEventAsync<string>("pubsub", "deathStarStatus", msg);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
}
}
_daprClient.PublishEventAsync
修改launchSettings.json文件，将"applicationUrl"改为 "http://localhost:5002"
在front项目根目录运行
dapr run --app-id front --app-port 5002 dotnet run
命令行发布订阅
dapr publish --publish-app-id front --pubsub pubsub --topic deathStarStatus --data "hello"
backend控制台会显示下面消息
网页发布订阅
访问front网站，Swagger UI
运行TestPub后，backend项目控制台会显示接受到订阅消息
k8s模式运行dapr
#初始化dapr集群
dapr uninstall --all
docker rm -f backend front
dapr init -k
构建docker镜像
docker build -t daprbackend:v2 -f backend/Dockerfile .
docker build -t daprfrontend:v2 -f front/Dockerfile .
运行k8s项目
kubectl apply -f k8s/dapr-backend.yaml
kubectl apply -f k8s/dapr-front.yaml
dapr-backend.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
name: dapr-deploy-backend
labels:
service: backend
spec:
replicas: 1
selector:
matchLabels:
service: backend
template:
metadata:
labels:
service: backend
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "backend" #这里要注意app-id要与front调用的名称要一致
dapr.io/app-port: "8080"
#dapr.io/config: "dapr-config"
spec:
containers:
- name: daprbackend
image: daprbackend:v2
imagePullPolicy: Never
ports:
- name: http
containerPort: 8080
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: daprbackend
labels:
service: backend
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
nodePort: 30003
protocol: TCP
name: http
- port: 50001
targetPort: 50001
nodePort: 30042
protocol: TCP
name: dapr-grpc
selector:
service: backend
dapr-front.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
name: dapr-deploy-front
labels:
service: front
spec:
replicas: 1
selector:
matchLabels:
service: front
template:
metadata:
labels:
service: front
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "front"
dapr.io/app-port: "8080"
#dapr.io/config: "dapr-config"
spec:
containers:
- name: daprfrontend
image: daprfrontend:v2
imagePullPolicy: Never
ports:
- name: http
containerPort: 8080
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: daprfrontend
labels:
service: front
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
nodePort: 30004
protocol: TCP
name: http
- port: 50001
targetPort: 50001
nodePort: 30041
protocol: TCP
name: dapr-grpc
selector:
service: front
运行发布端项目
访问http://127.0.0.1:30004/swagger/index.html
运行TestPub，
终端会显示以下错误，原因是pubsub组件没运行
运行pubsub组件
kubectl apply -f redis.yaml
kubectl apply -f pubsub.yaml
redis.yaml文件
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: redis
version: v1
name: redis
spec:
replicas: 1
selector:
matchLabels:
app: redis
strategy:
type: Recreate
template:
metadata:
labels:
app: redis
spec:
containers:
- name: redis
image: redis:6-alpine
imagePullPolicy: IfNotPresent
ports:
- containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
labels:
app: redis
name: redis
spec:
type: NodePort
ports:
- name: "data"
port: 6379
targetPort: 6379
selector:
app: redis
pubsub.yaml文件
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: pubsub
spec:
type: pubsub.redis
version: v1
metadata:
- name: redisHost
value: redis:6379
- name: redisPassword
value: ""
重新运行发布于订阅程序
kubectl delete -f k8s/dapr-front.yaml
kubectl delete -f k8s/dapr-backend.yaml
kubectl apply -f k8s/dapr-front.yaml
kubectl apply -f k8s/dapr-backend.yaml
验证实验成功
访问 http://127.0.0.1:30004/swagger/index.html
查看订阅端的日志，收到信息“wxy"，就表示实验成功
常用命令
dapr run --app-id backend --app-port 5001 dotnet run
dapr run --app-id front --app-port 5002 dotnet run
dapr publish --publish-app-id front --pubsub pubsub --topic deathStarStatus --data "hello"
::kubectl delete all --all
::dapr uninstall --all
dapr uninstall --all
docker rm -f backend front
dapr init -k
docker build -t daprbackend -f backend/Dockerfile .
docker build -t daprfrontend -f front/Dockerfile .
Dapr uninstall --all
dapr init -k
kubectl apply -f k8s/dapr-backend.yaml
kubectl apply -f k8s/dapr-front.yaml
pause
参考文章
文章源码下载
作者
吴晓阳，微信号:shiningrise，email:shiningrise@qq.com
