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giordanol
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Added demo projrct for DI
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7 files changed

+165
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‎Blumchen.sln‎

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@@ -45,6 +45,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "demo", "demo", "{A4044484-F
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Blumchen.DependencyInjection", "src\Blumchen.DependencyInjection\Blumchen.DependencyInjection.csproj", "{A07167E3-4CF7-40EF-8E55-A37A0F57B89D}"
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SubscriberWorker", "src\SubscriberWorker\SubscriberWorker.csproj", "{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{A07167E3-4CF7-40EF-8E55-A37A0F57B89D}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A07167E3-4CF7-40EF-8E55-A37A0F57B89D}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A07167E3-4CF7-40EF-8E55-A37A0F57B89D}.Release|Any CPU.Build.0 = Release|Any CPU
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{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
@@ -85,6 +91,7 @@ Global
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{F81E2D5B-FC59-4396-A911-56BE65E4FE80} = {A4044484-FE08-4399-8239-14AABFA30AD7}
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{C050E9E8-3FB6-4581-953F-31826E385FB4} = {CD59A1A0-F40D-4047-87A3-66C0F1519FA5}
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{8AAAA344-B5FD-48D9-B2BA-379E374448D4} = {CD59A1A0-F40D-4047-87A3-66C0F1519FA5}
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{DB58DB36-0366-4ABA-BC06-FCA9BB10EB92} = {A4044484-FE08-4399-8239-14AABFA30AD7}
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {9A868C51-0460-4700-AF33-E1A921192614}

‎README.md‎

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@@ -18,7 +18,7 @@ Main logic is placed in [EventsSubscription](./src/Blumchen/Subscriptions/Subscr
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```shell
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docker-compose up
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```
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2. Run(order doesn't matter) Publisher and Subscriber apps, under 'demo' folder, from vs-studio, and follow Publisher instructions.
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2. Run(order doesn't matter) Publisher and (Subscriber or SubscriberWorker) apps, under 'demo' folder, from vs-studio, and follow Publisher instructions.
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## Testing (against default docker instance)
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‎src/SubscriberWorker/Contracts.cs‎

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using System.Text.Json.Serialization;
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using Blumchen.Serialization;
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namespace SubscriberWorker
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{
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[MessageUrn("user-created:v1")]
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public record UserCreatedContract(
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Guid Id,
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string Name
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);
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[MessageUrn("user-deleted:v1")]
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public record UserDeletedContract(
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Guid Id,
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string Name
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);
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[JsonSourceGenerationOptions(WriteIndented = true)]
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[JsonSerializable(typeof(UserCreatedContract))]
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[JsonSerializable(typeof(UserDeletedContract))]
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internal partial class SourceGenerationContext: JsonSerializerContext;
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}

‎src/SubscriberWorker/Handler.cs‎

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using Blumchen.Subscriptions;
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using Microsoft.Extensions.Logging;
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#pragma warning disable CS9113 // Parameter is unread.
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namespace SubscriberWorker;
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public class Handler<T>(ILoggerFactory loggerFactory): IHandler<T> where T : class
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{
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private readonly ILogger _logger = loggerFactory.CreateLogger<Handler<T>>();
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private Task ReportSuccess(int count)
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{
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if(_logger.IsEnabled(LogLevel.Debug))
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_logger.LogDebug($"Read #{count} messages {typeof(T).FullName}");
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return Task.CompletedTask;
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}
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private int _counter;
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private int _completed;
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public Task Handle(T value)
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=> Interlocked.Increment(ref _counter) % 10 == 0
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//Simulating some exception on out of process dependencies
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? Task.FromException(new Exception($"Error on publishing {nameof(T)}"))
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: ReportSuccess(Interlocked.Increment(ref _completed));
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}

‎src/SubscriberWorker/Program.cs‎

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using System.Text.Json.Serialization;
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using Blumchen.Configuration;
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using Blumchen.Serialization;
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using Blumchen.Subscriptions;
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using Blumchen.Workers;
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using Commons;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using Microsoft.Extensions.Logging;
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using Polly.Retry;
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using Polly;
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using SubscriberWorker;
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#pragma warning disable CS8601 // Possible null reference assignment.
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Console.Title = typeof(Program).Assembly.GetName().Name;
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#pragma warning restore CS8601 // Possible null reference assignment.
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AppDomain.CurrentDomain.UnhandledException += (_, e) => Console.Out.WriteLine(e.ExceptionObject.ToString());
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TaskScheduler.UnobservedTaskException += (_, e) => Console.Out.WriteLine(e.Exception.ToString());
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var cancellationTokenSource = new CancellationTokenSource();
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var builder = Host.CreateApplicationBuilder(args);
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builder.Services
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.AddBlumchen<SubscriberWorker<UserCreatedContract>, UserCreatedContract>()
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.AddSingleton<IHandler<UserCreatedContract>, Handler<UserCreatedContract>>()
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.AddBlumchen<SubscriberWorker<UserDeletedContract>, UserDeletedContract>()
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.AddSingleton<IHandler<UserDeletedContract>, Handler<UserDeletedContract>>()
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.AddSingleton<INamingPolicy, AttributeNamingPolicy>()
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.AddSingleton<IErrorProcessor, ConsoleOutErrorProcessor>()
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.AddSingleton<JsonSerializerContext, SourceGenerationContext>()
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.AddSingleton(new DatabaseOptions(Settings.ConnectionString))
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.AddResiliencePipeline("default",(pipelineBuilder,context) =>
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pipelineBuilder
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.AddRetry(new RetryStrategyOptions
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{
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BackoffType = DelayBackoffType.Constant,
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Delay = TimeSpan.FromSeconds(5),
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MaxRetryAttempts = int.MaxValue
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}).Build())
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.AddLogging(loggingBuilder =>
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{
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loggingBuilder
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.AddFilter("Microsoft", LogLevel.Warning)
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.AddFilter("System", LogLevel.Warning)
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.AddFilter("Npgsql", LogLevel.Information)
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.AddFilter("Blumchen", LogLevel.Debug)
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.AddFilter("SubscriberWorker", LogLevel.Debug)
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.AddSimpleConsole();
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});
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await builder
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.Build()
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.RunAsync(cancellationTokenSource.Token)
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.ConfigureAwait(false);

‎src/SubscriberWorker/SubscriberWorker.cs‎

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using System.Text.Json.Serialization;
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using Blumchen.Configuration;
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using Blumchen.Serialization;
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using Blumchen.Subscriptions;
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using Blumchen.Subscriptions.Management;
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using Blumchen.Workers;
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using Microsoft.Extensions.Logging;
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using Polly.Registry;
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// ReSharper disable ClassNeverInstantiated.Global
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namespace SubscriberWorker;
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public class SubscriberWorker<T>(
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DatabaseOptions databaseOptions,
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IHandler<T> handler,
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JsonSerializerContext jsonSerializerContext,
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ResiliencePipelineProvider<string> pipelineProvider,
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INamingPolicy namingPolicy,
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IErrorProcessor errorProcessor,
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ILoggerFactory loggerFactory
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): Worker<T>(databaseOptions
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, handler
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, jsonSerializerContext
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, errorProcessor
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, pipelineProvider.GetPipeline("default")
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, namingPolicy
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, new PublicationManagement.PublicationSetupOptions($"{typeof(T).Name}_pub")
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, new ReplicationSlotManagement.ReplicationSlotSetupOptions($"{typeof(T).Name}_slot")
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, loggerFactory) where T : class;

‎src/SubscriberWorker/SubscriberWorker.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<PublishAot>true</PublishAot>
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<InvariantGlobalization>true</InvariantGlobalization>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
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<PackageReference Include="Polly.Extensions" Version="8.4.1" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Blumchen.DependencyInjection\Blumchen.DependencyInjection.csproj" />
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<ProjectReference Include="..\Commons\Commons.csproj" />
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</ItemGroup>
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</Project>

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