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  • Dapr 运用

    Dapr 运用

    • 前置条件
      • Docker
      • Win10

    Dapr 部署

    本文将采用本地部署的方式。

    安装 Dapr CLI

    打开 Windows PowerShell 或 cmd ,运行以下命令以安装 Dapr CLI,并添加安装路径到系统环境变量中。

    powershell -Command "iwr -useb https://raw.githubusercontent.com/dapr/cli/master/install/install.ps1 | iex"
    

    这里安装可能会失败。如果失败可以手动安装。

    • 打开 Dapr 发布页面下载 dapr_windows_amd64.zip
    • 解压文件 zip 文件
    • 把解压后的文件拷贝到 C:dapr

    安装 MySql

    Docker 启动 Mysql

    docker run --name mysqltest -e MYSQL_ROOT_PASSWORD=123456 -d mysql
    

    使用 Dapr CLI 安装 Darp runtime

    在 Windows PowerShell 或 cmd 中使用命令 dapr init 以安装 Dapr。

    同时可以在 Docker 中查看 Dapr 容器。

    至此,一个本地 Dapr 服务搭建完成。

    使用 Asp.Net Core 搭建 ProductService 服务

    ProductService 提供两个服务

    • 获取所有产品集合
    • 添加产品
    1. 使用 ASP.Net Core 创建 ProductService ,具体参考源码

    2. Dapr 启动 ProductService

      dapr run --app-id productService --app-port 5000 dotnet run
      
    3. 获取所有产品集合,使用 curl 命令

      curl -X GET http://localhost:5000/getlist
      

      或者

      curl -X GET http://localhost:54680/v1.0/invoke/productService/method/getlist
      
    4. 添加一个产品

      curl -X POST https://localhost:5001/product -H "Content-Type: application/json" -d "{ "id": "14a3611d-1561-455f-9c72-381eed2f6ee3" }"
      
    5. 重点,通过 Dapr 添加一个产品,先看添加产品的代码

       /// <summary>
       /// 创建产品
       /// </summary>
       /// <param name="productCreate">产品创建模型</param>
       /// <returns></returns>
       [Topic("product")]
       [HttpPost("product")]
       public async Task<bool> CreateProduct(ProductCreate productCreate)
       {
           _productContext.Products.Add(new Product
           {
               ProductID = productCreate.ID
           });
           return await _productContext.SaveChangesAsync() == 1;
       }
      
      • 使用 Dapr cli 发布事件

         dapr invoke -a productService -m product -p "{"id":"b1ccf14a-408a-428e-b0f0-06b97cbe4135"}"
        

        输出为:

        true
        App invoked successfully
        
      • 使用 curl 命令直接请求 ProductService 地址

        curl -X POST http://localhost:5000/product -H "Content-Type: application/json" -d "{ "id": "14a3611d-1561-455f-9c72-381eed2f64e3" }"
        

        输出为:

        true
        
      • 使用 curl 命令通过 Dapr runtime

        curl -X POST http://localhost:54680/v1.0/invoke/productService/method/product -H "Content-Type: application/json" -d "{ "id": "14a3611d-1561-455f-9c72-381eed2f54e3" }"
        

        输出为:

        true
        

    注意:

    • Dapr 使用 App 端口号应与服务端口号相同,例如:ASP.Net Core 服务端口号为5000,则在使用 Dapr 托管应用程序时的端口号也应使用 5000

    至此, ProductService 创建完成。

    使用 Golang 创建 gRPC Server

    1. 创建 Server

      package main
      
      import (
          "context"
          "fmt"
          "log"
          "net"
      
          "github.com/golang/protobuf/ptypes/any"
          "github.com/golang/protobuf/ptypes/empty"
      
          pb "github.com/dapr/go-sdk/daprclient"
          "google.golang.org/grpc"
      )
      
      // server is our user app
      type server struct {
      }
      
      func main() {
          // create listiner
          lis, err := net.Listen("tcp", ":4000")
          if err != nil {
              log.Fatalf("failed to listen: %v", err)
          }
      
          // create grpc server
          s := grpc.NewServer()
          pb.RegisterDaprClientServer(s, &server{})
      
          fmt.Println("Client starting...")
      
          // and start...
          if err := s.Serve(lis); err != nil {
              log.Fatalf("failed to serve: %v", err)
          }
      }
      
      // Sample method to invoke
      func (s *server) MyMethod() string {
          return "Hi there!"
      }
      
      // This method gets invoked when a remote service has called the app through Dapr
      // The payload carries a Method to identify the method, a set of metadata properties and an optional payload
      func (s *server) OnInvoke(ctx context.Context, in *pb.InvokeEnvelope) (*any.Any, error) {
          var response string
      
          fmt.Println(fmt.Sprintf("Got invoked with: %s", string(in.Data.Value)))
      
          switch in.Method {
          case "MyMethod":
              response = s.MyMethod()
          }
          return &any.Any{
              Value: []byte(response),
          }, nil
      }
      
      // Dapr will call this method to get the list of topics the app wants to subscribe to. In this example, we are telling Dapr
      // To subscribe to a topic named TopicA
      func (s *server) GetTopicSubscriptions(ctx context.Context, in *empty.Empty) (*pb.GetTopicSubscriptionsEnvelope, error) {
          return &pb.GetTopicSubscriptionsEnvelope{
              Topics: []string{"TopicA"},
          }, nil
      }
      
      // Dapper will call this method to get the list of bindings the app will get invoked by. In this example, we are telling Dapr
      // To invoke our app with a binding named storage
      func (s *server) GetBindingsSubscriptions(ctx context.Context, in *empty.Empty) (*pb.GetBindingsSubscriptionsEnvelope, error) {
          return &pb.GetBindingsSubscriptionsEnvelope{
              Bindings: []string{"storage"},
          }, nil
      }
      
      // This method gets invoked every time a new event is fired from a registerd binding. The message carries the binding name, a payload and optional metadata
      func (s *server) OnBindingEvent(ctx context.Context, in *pb.BindingEventEnvelope) (*pb.BindingResponseEnvelope, error) {
          fmt.Println("Invoked from binding")
          return &pb.BindingResponseEnvelope{}, nil
      }
      
      // This method is fired whenever a message has been published to a topic that has been subscribed. Dapr sends published messages in a CloudEvents 0.3 envelope.
      func (s *server) OnTopicEvent(ctx context.Context, in *pb.CloudEventEnvelope) (*empty.Empty, error) {
          fmt.Println("Topic message arrived")
          return &empty.Empty{}, nil
      }
      
      
    2. 使用 Dapr 命令启动 StorageService

       dapr run --app-id client --protocol grpc --app-port 4000 go run main.go
      

    注意:

    • Dapr 使用 App 端口号应与服务端口号相同,使用 --protocal grpc 指定通讯协议为 grpc 。此外,OnInvoke 中的 switch 方法用于调用者路由。

    使用 ASP.NET Core 创建 StorageService

    1. 使用 NuGet 获取程序管理包控制台安装以下包

      • Dapr.AspNetCore
      • Dapr.Client.Grpc
      • Grpc.AspNetCore
      • Grpc.Net.Client
      • Grpc.Tools
    2. Startup.cs 文件中修改代码如下:

      /// <summary>
      /// This method gets called by the runtime. Use this method to add services to the container.
      /// </summary>
      /// <param name="services">Services.</param>
      public void ConfigureServices(IServiceCollection services)
      {
          services.AddControllers().AddDapr();
          services.AddDbContextPool<StorageContext>(options => { options.UseMySql(Configuration.GetConnectionString("MysqlConnection")); });
      }
      
       /// <summary>
      /// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
      /// </summary>
      /// <param name="app">app.</param>
      /// <param name="env">env.</param>
      public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
      {
          if (env.IsDevelopment())
          {
              app.UseDeveloperExceptionPage();
          }
      
          app.UseRouting();
          app.UseCloudEvents();
      
          app.UseAuthorization();
      
          app.UseEndpoints(endpoints =>
          {
              endpoints.MapSubscribeHandler();
              endpoints.MapControllers();
          });
      }
      
    3. 添加 StorageController.cs 文件,内容如下

      using System;
      using System.Linq;
      using System.Threading.Tasks;
      using Dapr.Client.Grpc;
      using Google.Protobuf;
      using Grpc.Net.Client;
      using Microsoft.AspNetCore.Mvc;
      using StorageService.Api.Entities;
      
      namespace StorageService.Api.Controllers
      {
          [ApiController]
          public class StorageController : ControllerBase
          {
              private readonly StorageContext _storageContext;
      
              public StorageController(StorageContext storageContext)
              {
                  _storageContext = storageContext;
              }
      
              /// <summary>
              /// 初始化仓库.
              /// </summary>
              /// <returns>是否成功.</returns>
              [HttpGet("InitialStorage")]
              public async Task<bool> InitialStorage()
              {
                  string defaultPort = Environment.GetEnvironmentVariable("DAPR_GRPC_PORT") ?? "54681";
      
                  // Set correct switch to make insecure gRPC service calls. This switch must be set before creating the GrpcChannel.
                  AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
      
                  // Create Client
                  string daprUri = $"http://127.0.0.1:{defaultPort}";
                  GrpcChannel channel = GrpcChannel.ForAddress(daprUri);
                  var client = new Dapr.Client.Grpc.Dapr.DaprClient(channel);
                  Console.WriteLine(daprUri);
      
                  InvokeServiceResponseEnvelope result = await client.InvokeServiceAsync(new InvokeServiceEnvelope
                  {
                      Method = "MyMethod",
                      Id = "client",
                      Data = new Google.Protobuf.WellKnownTypes.Any
                      {
                          Value = ByteString.CopyFromUtf8("Hello ProductService")
                      }
                  });
                  Console.WriteLine("this is call result:" + result.Data.Value.ToStringUtf8());
                  //var productResult = result.Data.Unpack<ProductList.V1.ProductList>();
                  //Console.WriteLine("this is call result:" + productResult.Results.FirstOrDefault());
                  return true;
              }
      
              /// <summary>
              /// 修改库存
              /// </summary>
              /// <param name="storage"></param>
              /// <returns></returns>
              [HttpPut("Reduce")]
              public bool Reduce(Storage storage)
              {
                  Storage storageFromDb = _storageContext.Storage.FirstOrDefault(q => q.ProductID.Equals(storage.ProductID));
                  if (storageFromDb == null)
                  {
                      return false;
                  }
      
                  if (storageFromDb.Amount <= storage.Amount)
                  {
                      return false;
                  }
      
                  storageFromDb.Amount -= storage.Amount;
                  return true;
              }
          }
      }
      
    4. 使用 Dapr cli 启用 StorageService 服务

      dapr run --app-id storageService --app-port 5003 dotnet run
      
    5. 使用 curl 命令访问 StorageService InitialStorage 方法

      curl -X GET http://localhost:56349/v1.0/invoke/storageService/method/InitialStorage
      

      输入

      true
      

      其中打印信息为:

      this is call result:Hi there!
      

    注意:

    • Dapr 使用 App 端口号应与服务端口号相同,例如:ASP.Net Core 服务端口号为5003,则在使用 Dapr 托管应用程序时的端口号也应使用 5003,在 Client.InvokeServiceAsync 中的 Id 指被调用方的 App-Id ,Method 指被调用方方法名称。参考 Go Server 中 OnInvoke 方法的 Switch 。

    源码地址

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  • 原文地址:https://www.cnblogs.com/Zhang-Xiang/p/12035354.html
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