标签：tor https yam uniq bat 成功 版本 customer publish
前置条件:
《Dapr运用》
《Dapr 运用之 Java gRPC 调用篇》
《Dapr 运用之集成 Asp.Net Core Grpc 调用篇》
搭建 RabbitMQ
Docker 搭建 RabbitMQ 服务
docker run -d --hostname my-rabbit --name some-rabbit -p 5672:5672 -p 15672:15672 rabbitmq:3-management创建 rabbiqmq.yaml
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: messagebus
spec:
type: pubsub.rabbitmq
metadata:
- name: host
value: "amqp://localhost:5672" # Required. Example: "rabbitmq.default.svc.cluster.local:5672"
- name: consumerID
value: "61415901178272324029" # Required. Any unique ID. Example: "myConsumerID"
- name: durable
value: "true" # Optional. Default: "false"
- name: deletedWhenUnused
value: "false" # Optional. Default: "false"
- name: autoAck
value: "false" # Optional. Default: "false"
- name: deliveryMode
value: "2" # Optional. Default: "0". Values between 0 - 2.
- name: requeueInFailure
value: "true" # Optional. Default: "false".改造 StorageService.Api
目的：把 StorageService 从 Grpc 客户端改造为 Grpc 服务端，并 Sub Storage.Reduce 主题，完成减库存操作。
修改 Program.cs 中的 CreateHostBuilder 代码为
public static IHostBuilder CreateHostBuilder(string[] args)
{
return Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.ConfigureKestrel(options =>
{
options.Listen(IPAddress.Loopback, 5003, listenOptions =>
{
listenOptions.Protocols = HttpProtocols.Http2;
});
});
webBuilder.UseStartup<Startup>();
});
}添加 DaprClientService
public sealed class DaprClientService : DaprClient.DaprClientBase
{
public override Task<GetTopicSubscriptionsEnvelope> GetTopicSubscriptions(Empty request, ServerCallContext context)
{
var topicSubscriptionsEnvelope = new GetTopicSubscriptionsEnvelope();
topicSubscriptionsEnvelope.Topics.Add("Storage.Reduce");
return Task.FromResult(topicSubscriptionsEnvelope);
}
}Dapr 运行时将调用此方法获取 StorageServcie 关注的主题列表。
修改 Startup.cs
/// <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.AddGrpc();
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.UseEndpoints(endpoints =>
{
endpoints.MapSubscribeHandler();
endpoints.MapGrpcService<DaprClientService>();
});
}复制 rabbimq.yaml 文件到 components 文件夹中，删除 redis_messagebus.yaml 文件
启动 StorageService 服务
dapr run --app-id storageService --app-port 5003 --protocol grpc dotnet run在当前上下文中着重处理的是下单功能，以及下单成功后 Java 服务端将发布一个事件到 Storage.Reduce 主题，即减少库存。
创建 CreateOrder.proto 文件
syntax = "proto3";
package daprexamples;
option java_outer_classname = "CreateOrderProtos";
option java_package = "generate.protos";
service OrderService {
rpc CreateOrder (CreateOrderRequest) returns (CreateOrderResponse);
rpc RetrieveOrder(RetrieveOrderRequest) returns(RetrieveOrderResponse);
rpc GetOrderList(GetOrderListRequest) returns(GetOrderListResponse);
}
message CreateOrderRequest {
string ProductID = 1; //Product ID
int32 Amount=2; //Product Amount
string CustomerID=3; //Customer ID
}
message CreateOrderResponse {
bool Succeed = 1; //Create Order Result，true:success，false:fail
}
message RetrieveOrderRequest{
string OrderID=1;
}
message RetrieveOrderResponse{
Order Order=1;
}
message GetOrderListRequest{
string CustomerID=1;
}
message GetOrderListResponse{
repeated Order Orders=1;
}
message Order{
string ID=1;
string ProductID=2;
int32 Amount=3;
string CustomerID=4;
}使用 protoc 生成 Java 代码
protoc -I=C:\Users\JR\DaprDemos\java\examples\src\main\protos\examples --java_out=C:\Users\JR\DaprDemos\java\examples\src\main\java C:\Users\JR\DaprDemos\java\examples\src\main\protos\examples\CreateOrder.protocreateOrder() 、 getOrderList() 、 retrieveOrder() 三个函数的实现启动 OrderService 服务
dapr run --app-id OrderService --app-port 5000 --protocol grpc -- mvn exec:java -pl=examples -Dexec.mainClass=server.HelloWorldService -Dexec.args="-p 5000"创建 Golang Grpc 客户端，该客户端需要完成创建订单 Grpc 调用，订单创建成功发布扣除库存事件
引用 CreateOrder.proto 文件，并生成 CreateOrder.pb.go 文件
如未安装 protoc-gen-gogo ,通过一下命令获取并安装
go get github.com/gogo/protobuf/gogoproto安装 protoc-gen-gogo
go install github.com/gogo/protobuf/gogoproto根据 proto 文件生成代码
protoc -I C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples\CreateOrder.proto --go_out=plugins=grpc:C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples\客户端代码，创建订单
...
response, err := client.InvokeService(context.Background(), &pb.InvokeServiceEnvelope{
Id: "OrderService",
Data: createOrderRequestData,
Method: "createOrder",
})
if err != nil {
fmt.Println(err)
return
}
...添加 DataToPublish.proto 文件，此文件作为事件发布数据结构
syntax = "proto3";
package daprexamples;
option java_outer_classname = "DataToPublishProtos";
option java_package = "generate.protos";
message StorageReduceData {
string ProductID = 1;
int32 Amount=2;
}生成 DataToPublish 代码
protoc -I C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples\DataToPublish.proto --go_out=plugins=grpc:C:\Users\JR\DaprDemos\golang\shoppingCartForJava\protos\daprexamples\修改 main.go 代码，根据 createOrder 结果判断是否要发布信息到消息队列
...
createOrderResponse := &daprexamples.CreateOrderResponse{}
if err := proto.Unmarshal(response.Data.Value, createOrderResponse); err != nil {
fmt.Println(err)
return
}
fmt.Println(createOrderResponse.Succeed)
if !createOrderResponse.Succeed {
//下单失败
return
}
storageReduceData := &daprexamples.StorageReduceData{
ProductID: createOrderRequest.ProductID,
Amount: createOrderRequest.Amount,
}
storageReduceDataData, err := jsoniter.ConfigFastest.Marshal(storageReduceData) //ptypes.MarshalAny(storageReduceData)
if err != nil {
fmt.Println(err)
return
}
_, err = client.PublishEvent(context.Background(), &pb.PublishEventEnvelope{
Topic: "Storage.Reduce",
Data: &any.Any{Value: storageReduceDataData},
})
fmt.Println(storageReduceDataData)
if err != nil {
fmt.Println(err)
} else {
fmt.Println("Published message!")
}
...注意： 发送数据前，使用 jsoniter 转换数据为 json 字符串，原因是如果直接传输 Grpc 流，当前版本(0.3.x) Dapr runtime 打包数据时使用 Json 打包，解包使用 String ，导致数据不一致。
启动 golang Grpc 客户端
dapr run --app-id client go run main.go输出
== APP == true
== APP == Published message!RabbitMQ
http://localhost:15672/ ，账号和密码均为 guest查看 Exchanges
Name Type Features Message rate in Message rate out
(AMQP default) direct D
Storage.Reduce fanout D
amq.direct direct D
amq.fanout fanout D
...着重看 Storage.Reduce ，可以看出 Dapr 运行时创建了一个 fanout 类型的 Exchange ，这表明该 Exhange 中的数据是广播的。
查看 Queues
Dapr 运行时创建了 storageService-Storage.Reduce ，该 Queue 绑定了 Storage.Reduce Exchange ，所以可以收到 Storage.Reduce 的广播数据。
DotNet Core StorageService.Api 改造以完成 Sub 事件
打开 DaprClientService.cs 文件，更改内容为
public sealed class DaprClientService : DaprClient.DaprClientBase
{
private readonly StorageContext _storageContext;
public DaprClientService(StorageContext storageContext)
{
_storageContext = storageContext;
}
public override Task<GetTopicSubscriptionsEnvelope> GetTopicSubscriptions(Empty request, ServerCallContext context)
{
var topicSubscriptionsEnvelope = new GetTopicSubscriptionsEnvelope();
topicSubscriptionsEnvelope.Topics.Add("Storage.Reduce");
return Task.FromResult(topicSubscriptionsEnvelope);
}
public override async Task<Empty> OnTopicEvent(CloudEventEnvelope request, ServerCallContext context)
{
if (request.Topic.Equals("Storage.Reduce"))
{
StorageReduceData storageReduceData = StorageReduceData.Parser.ParseJson(request.Data.Value.ToStringUtf8());
Console.WriteLine("ProductID:" + storageReduceData.ProductID);
Console.WriteLine("Amount:" + storageReduceData.Amount);
await HandlerStorageReduce(storageReduceData);
}
return new Empty();
}
private async Task HandlerStorageReduce(StorageReduceData storageReduceData)
{
Guid productID = Guid.Parse(storageReduceData.ProductID);
Storage storageFromDb = await _storageContext.Storage.FirstOrDefaultAsync(q => q.ProductID.Equals(productID));
if (storageFromDb == null)
{
return;
}
if (storageFromDb.Amount < storageReduceData.Amount)
{
return;
}
storageFromDb.Amount -= storageReduceData.Amount;
Console.WriteLine(storageFromDb.Amount);
await _storageContext.SaveChangesAsync();
}GetTopicSubscriptions() 将完成对主题的关注
OnTopicEvent() 重写，此方法将完成对 Sub 主题的事件处理HandlerStorageReduce 用于减少库存启动 DotNet Core StorageService.Api Grpc 服务，启动 Java OrderService Grpc 服务，启动 Go Grpc 客户端
DotNet Core
dapr run --app-id storageService --app-port 5003 --protocol grpc dotnet runJava
dapr run --app-id OrderService --app-port 5000 --protocol grpc -- mvn exec:java -pl=examples -Dexec.mainClass=server.HelloWorldService -Dexec.args="-p 5000"go
dapr run --app-id client go run main.gogo grpc 输出为
== APP == true
== APP == Published message!查看 MySql Storage 数据库，对应产品库存减少 20
至此，通过 Dapr runtime 完成了 Go 和 Java 之间的 Grpc 调用，并通过 RabbitMQ 组件完成了 Pub/Sub
Dapr Pub/Sub 集成 RabbitMQ 、Golang、Java、DotNet Core
标签：tor https yam uniq bat 成功 版本 customer publish
原文地址：https://www.cnblogs.com/Zhang-Xiang/p/12106577.html
