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Киев 2017
Только реальные кейсы. Только актуальные тренды.
Architecture &
Development of .NET Core
Applications
Andrey Ant...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
Analytics says…
.NET Core will be as popular as Ruby and
NodeJS.
.NET Core and NodeJS will be the most popular
p...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
.NET Core :: Few Things
• Many mechanisms such as authentication, security,
component interactions now changed c...
Киев 2017
.Net Core vs .Net Framework
• There are cross-platform needs.
• Application architecture is based
on microservic...
Киев 2017
.Net Core vs .Net Framework
Architecture & Development of .NET Core Applications
Architecture / App Type Linux c...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
Microservices :: Pros and Cons
• Each microservice is relatively
small—easy to manage and evolve.
• It is possib...
Киев 2017
.Net Core Apps :: Hosting
Architecture & Development of .NET Core Applications
Feature App
Service
Service
Fabri...
Киев 2017
High-Level Architecture
Architecture & Development of .NET Core Applications
User Interface
Business Logic
Data ...
Киев 2017
High-Level Architecture
Architecture & Development of .NET Core Applications
Киев 2017
Architectural Principles
Architecture & Development of .NET Core Applications
• SOLID
• Separation of Concerns
•...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
API :: Direct Communication
Architecture & Development of .NET Core Applications
Back-End
Microservice 1
Microse...
Киев 2017
API :: API Gateway
Architecture & Development of .NET Core Applications
Back-End
Microservice 1
Microservice 2
M...
Киев 2017
API :: Azure API Management
Architecture & Development of .NET Core Applications
Back-End
Microservice 1
Microse...
Киев 2017
API :: Swagger
• Automatically generates API documentation
• Supports Client API generation and discoverability
...
Киев 2017
API :: Swagger Configuration
Architecture & Development of .NET Core Applications
public void ConfigureServices(...
Киев 2017
API :: AutoRest
Architecture & Development of .NET Core Applications
{autorest-location}autorest -Input http://{...
Киев 2017
API :: Versioning
Architecture & Development of .NET Core Applications
Back-End
V 1.0
API Gateway
V N.M
…
New Cl...
Киев 2017
API Versioning :: Business Rules
• API versioning shall be applicable for any API endpoint.
• Old versions has t...
Киев 2017
API Versioning :: Versioning in URI
Architecture & Development of .NET Core Applications
• URI Path
https://mywe...
Киев 2017
Versioning with Headers
Architecture & Development of .NET Core Applications
GET /api/camps HTTP/1.1
Host: local...
Киев 2017
Versioning with Content Type
Architecture & Development of .NET Core Applications
GET /api/camps HTTP/1.1
Host: ...
Киев 2017
Versioning in Action
Architecture & Development of .NET Core Applications
• Use Microsoft ASP.NET API Versioning...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
EF Core :: Resilient Connections
Architecture & Development of .NET Core Applications
public void ConfigureServi...
Киев 2017
Resiliency and Transactions
Architecture & Development of .NET Core Applications
System.InvalidOperationExceptio...
Киев 2017
EF Core :: Seeding
Architecture & Development of .NET Core Applications
public class Startup
{
// Other Startup ...
Киев 2017
EF Core :: Seeding
Architecture & Development of .NET Core Applications
public class DatabaseSeed
{
public stati...
Киев 2017
EF Core :: Seeding Improvement
Architecture & Development of .NET Core Applications
• Use standard migration mec...
Киев 2017
EF Core :: Seeding Improvement
Architecture & Development of .NET Core Applications
/// <summary>
/// Seed Roles...
Киев 2017
EF Core :: InMemory Databases
Architecture & Development of .NET Core Applications
public class Startup
{
// Oth...
Киев 2017Architecture & Development of .NET Core Applications
Киев 2017
.NET Core Apps :: Health Cheks
Architecture & Development of .NET Core Applications
• https://github.com/aspnet/...
Киев 2017
.NET Core Apps :: Health Checks
Architecture & Development of .NET Core Applications
public class Program
{
publ...
Киев 2017
.NET Core Apps :: Health Checks
Architecture & Development of .NET Core Applications
public class Startup
{
publ...
Киев 2017
.NET Core Apps :: Health Checks
Architecture & Development of .NET Core Applications
checks.AddSqlCheck("MyDatab...
Киев 2017
.NET Core Apps :: Health Checks
Architecture & Development of .NET Core Applications
checks.AddHealthCheckGroup(...
Киев 2017
Service Fabric Health Monitoring
Architecture & Development of .NET Core Applications
fabric:/System
Киев 2017
Service Fabric Health Hierarchy
Architecture & Development of .NET Core Applications
Cluster
Nodes Applications
...
Киев 2017
Cluster Health Policy
Architecture & Development of .NET Core Applications
<FabricSettings>
<Section Name="Healt...
Киев 2017
Service Fabric :: Health Reports
Architecture & Development of .NET Core Applications
private static Uri Applica...
Киев 2017
Service Fabric + App Insights
Architecture & Development of .NET Core Applications
https://github.com/DeHeerSoft...
Киев 2017Architecture & Development of .NET Core Applications
Thank you!
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.NET Fest 2017. Андрей Антиликаторов. Проектирование и разработка приложений на .NET Core

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В докладе будут рассмотрены принципы и лучшие практики создания гибких масштабируемых приложений на базе Microsoft .NET Core в связке с сервисами Microsoft Azure. Будет рассмотрен ряд полезных подходов, инструментов и библиотек, которые сильно упростят разработку, конфигурирование и развертывание приложений. Также будет уделено внимание некоторым “подводные камням”, с которыми может столкнуться человек, использующий .NET Core.

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.NET Fest 2017. Андрей Антиликаторов. Проектирование и разработка приложений на .NET Core

  1. 1. Киев 2017 Только реальные кейсы. Только актуальные тренды. Architecture & Development of .NET Core Applications Andrey Antilikatorov
  2. 2. Киев 2017Architecture & Development of .NET Core Applications
  3. 3. Киев 2017Architecture & Development of .NET Core Applications
  4. 4. Киев 2017 Analytics says… .NET Core will be as popular as Ruby and NodeJS. .NET Core and NodeJS will be the most popular platforms for back-end solution compete on the market. In few years .NET Core (not Java) will be number one choice for enterprise-level applications. Architecture & Development of .NET Core Applications .Net Core, Java, NodeJS…
  5. 5. Киев 2017Architecture & Development of .NET Core Applications
  6. 6. Киев 2017 .NET Core :: Few Things • Many mechanisms such as authentication, security, component interactions now changed comparing to .Net Framework. • Many components and platforms (for example for Desktop applications) are missing. • Nevertheless, .NET Core provides corporate-level software benefits for small projects. Architecture & Development of .NET Core Applications
  7. 7. Киев 2017 .Net Core vs .Net Framework • There are cross-platform needs. • Application architecture is based on microservices. • Scalability and high performance are the must. Need to get as much as possible out of the box. • Need to use both Linux and Windows containers. • You are running multiple .NET versions side-by-side. • Opensource framework is required. Architecture & Development of .NET Core Applications • Application currently uses .NET Framework and has strong dependencies on Windows. • Need to use Windows APIs that are not supported by .NET Core. • Need to use third-party libraries or NuGet packages that are not available for .NET Core. • Need tools, technologies or platforms not supported by .NET Core. .NET Core .Net Framework
  8. 8. Киев 2017 .Net Core vs .Net Framework Architecture & Development of .NET Core Applications Architecture / App Type Linux containers Windows Containers Microservices on containers .NET Core .NET Core Monolithic app .NET Core .NET Framework, .NET Core Best-in-class performance and scalability .NET Core .NET Core Windows Server legacy app (“brown-field”) migration to containers -- .NET Framework New container-based development (“green-field”) .NET Core .NET Core ASP.NET Core .NET Core .NET Core (recommended) .NET Framework ASP.NET 4 (MVC 5, Web API 2, and Web Forms) -- .NET Framework SignalR services .NET Core .NET Framework .NET Core WCF, WF, and other legacy frameworks Limited WCF support in .NET Core .NET Framework Limited WCF support in .NET Core Consumption of Azure services .NET Core .NET Framework, .NET Core
  9. 9. Киев 2017Architecture & Development of .NET Core Applications
  10. 10. Киев 2017 Microservices :: Pros and Cons • Each microservice is relatively small—easy to manage and evolve. • It is possible to scale out individual areas of the application. • You can divide the development work between multiple teams. • Issues are more isolated. • You can use the latest technologies. Architecture & Development of .NET Core Applications • Distributed application adds complexity for developers. • Deployment complexity. • Atomic transactions usually are not possible. • Usually increase hardware resource needs. • Communication complexity. • Correct system decomposition complexity. Benefits Disadvantages
  11. 11. Киев 2017 .Net Core Apps :: Hosting Architecture & Development of .NET Core Applications Feature App Service Service Fabric Virtual Machine Near-Instant Deployment X X Scale up to larger machines without redeploy X X Instances share content and configuration; no need to redeploy or reconfigure when scaling X X Multiple deployment environments (production, staging) X X Automatic OS update management X Seamless switching between 32/64 bit platforms X Deploy code with Git, FTP X X Deploy code with WebDeploy X X Deploy code with TFS X X X Host web or web service tier of multi-tier architecture X X X Access Azure services like Service Bus, Storage, SQL Database X X X Install any custom MSI X X
  12. 12. Киев 2017 High-Level Architecture Architecture & Development of .NET Core Applications User Interface Business Logic Data Access
  13. 13. Киев 2017 High-Level Architecture Architecture & Development of .NET Core Applications
  14. 14. Киев 2017 Architectural Principles Architecture & Development of .NET Core Applications • SOLID • Separation of Concerns • Explicit Dependencies • Don’t Repeat Yourself • Persistence Ignorance • Bounded Contexts • Command and Query Responsibility Segregation (CQRS) • Domain-Driven Design
  15. 15. Киев 2017Architecture & Development of .NET Core Applications
  16. 16. Киев 2017 API :: Direct Communication Architecture & Development of .NET Core Applications Back-End Microservice 1 Microservice 2 Microservice N … Client Apps
  17. 17. Киев 2017 API :: API Gateway Architecture & Development of .NET Core Applications Back-End Microservice 1 Microservice 2 Microservice N … Client Apps API Gateway
  18. 18. Киев 2017 API :: Azure API Management Architecture & Development of .NET Core Applications Back-End Microservice 1 Microservice 2 Microservice N … Client Apps Azure API Management
  19. 19. Киев 2017 API :: Swagger • Automatically generates API documentation • Supports Client API generation and discoverability • Provides ability to automatically consume and integrate APIs Architecture & Development of .NET Core Applications
  20. 20. Киев 2017 API :: Swagger Configuration Architecture & Development of .NET Core Applications public void ConfigureServices(IServiceCollection services) { // API documentation configuration var swaggerConfigurationInfo = new SwaggerConfigurationInfo() { Title = “My Application User API ", Description = "Service provides all user specific information and management api.", TermsOfService = “None”, SecuritySchemas = new List<SecurityScheme> { // Define the OAuth2.0 scheme (i.e. Implicit Flow), for access_token the user of // Swagger will be redirected to Auth0 Login hosted page to input credentials new OAuth2Scheme { Type = "oauth2", Flow = "implicit", AuthorizationUrl = m_identityProviderSettings.Auth0Authorize.AbsoluteUri, Scopes = new Dictionary<string, string> { { "openid profile email", "Security API" }} }}}; // Add Framework API services(API versioning, swagger, etc.) services.AddApiServices(swaggerConfigurationInfo); }
  21. 21. Киев 2017 API :: AutoRest Architecture & Development of .NET Core Applications {autorest-location}autorest -Input http://{webapiname}.azurewebsites.net/swagger/ public async void InvokeTest() { UserApiClient client = new UserApiClient(...); await client.IdentityUserActivatePostAsync( new ActivateUserModel { ExternalReferenceId = "1354687252", Password = "Qwerty123" }); }
  22. 22. Киев 2017 API :: Versioning Architecture & Development of .NET Core Applications Back-End V 1.0 API Gateway V N.M … New Client Apps Old Client Apps
  23. 23. Киев 2017 API Versioning :: Business Rules • API versioning shall be applicable for any API endpoint. • Old versions has to be supported as long as you agreed with our clients. • Old API versions should work the same way they worked before new version was introduced. • Old APIs shall be marked as deprecated. • All versions has to be testable via unit/integration tests. • Best practice is to apply versioning to external API only. Architecture & Development of .NET Core Applications
  24. 24. Киев 2017 API Versioning :: Versioning in URI Architecture & Development of .NET Core Applications • URI Path https://mywebportal.com/api/v2/getUsers • Query String https://mywebportal.com/api/getUsers?v=2.0
  25. 25. Киев 2017 Versioning with Headers Architecture & Development of .NET Core Applications GET /api/camps HTTP/1.1 Host: localhost:43333 Content-Type: application/json X-version: 2.0 GET /api/camps HTTP/1.1 Host: localhost:43333 Content-Type: application/json Accept: application/json;version=2.0
  26. 26. Киев 2017 Versioning with Content Type Architecture & Development of .NET Core Applications GET /api/camps HTTP/1.1 Host: localhost:43333 Content-Type: application/vnd.myapplication.v1+json Accept: application/vnd.myapplication.v1+json
  27. 27. Киев 2017 Versioning in Action Architecture & Development of .NET Core Applications • Use Microsoft ASP.NET API Versioning NuGet package • Each controller should be marked with API version: • Old versions of API controllers should be marked as deprecated: • Each API version should be stored in Version folder • Each controller should be placed in specific namespace • Unit and integration tests should be also stored separately
  28. 28. Киев 2017Architecture & Development of .NET Core Applications
  29. 29. Киев 2017 EF Core :: Resilient Connections Architecture & Development of .NET Core Applications public void ConfigureServices(IServiceCollection services) { services.AddDbContext<DbContext>(options => { options.UseSqlServer(Configuration["ConnectionString"], sqlServerOptionsAction: sqlOptions => { sqlOptions.EnableRetryOnFailure( maxRetryCount: 5, maxRetryDelay: TimeSpan.FromSeconds(10), errorNumbersToAdd: null); }); }); }
  30. 30. Киев 2017 Resiliency and Transactions Architecture & Development of .NET Core Applications System.InvalidOperationException: The configured execution strategy 'SqlServerRetryingExecutionStrategy' does not support user initiated transactions. Use the execution strategy returned by 'DbContext.Database.CreateExecutionStrategy()' to execute all the operations in the transaction as a retriable unit. // Use of resiliency strategy within an explicit transaction var strategy = dbContext.Database.CreateExecutionStrategy(); await strategy.ExecuteAsync(async () => { using (var transaction = dbContext.Database.BeginTransaction()) { dbContext.Users.Update(user); await dbContext.SaveChangesAsync(); await eventLogService.SaveEventAsync(userChangedEvent); transaction.Commit(); } }); SOLUTION
  31. 31. Киев 2017 EF Core :: Seeding Architecture & Development of .NET Core Applications public class Startup { // Other Startup code... public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) { // Other Configure code... // Seed data through our custom class DatabaseSeed.SeedAsync(app).Wait(); // Other Configure code... } }
  32. 32. Киев 2017 EF Core :: Seeding Architecture & Development of .NET Core Applications public class DatabaseSeed { public static async Task SeedAsync(IApplicationBuilder applicationBuilder) { var context = (AppDbContext)applicationBuilder. ApplicationServices.GetService(typeof(AppDbContext)); using (context) { context.Database.Migrate(); if (!context.Users.Any()) { context.Users.AddRange(...); await context.SaveChangesAsync(); } if (!context.Departments.Any()) { context.Departments.AddRange(...); await context.SaveChangesAsync(); } } } }
  33. 33. Киев 2017 EF Core :: Seeding Improvement Architecture & Development of .NET Core Applications • Use standard migration mechanism. • Create base class(es) for seed migrations. • Specify data context via attribute.
  34. 34. Киев 2017 EF Core :: Seeding Improvement Architecture & Development of .NET Core Applications /// <summary> /// Seed Roles, RolesClaims and UserRoles /// </summary> [DbContext(typeof(MyContext))] [Migration("SEED_201709121256_AddRolesClaimsUserRoles")] public class AddRolesClaimsUserRoles : EmptyDbSeedMigration { /// <summary> /// <see cref="SeedMigrationBase.PopulateData"/> /// </summary> protected override void PopulateData() { ... } }
  35. 35. Киев 2017 EF Core :: InMemory Databases Architecture & Development of .NET Core Applications public class Startup { // Other Startup code ... public void ConfigureServices(IServiceCollection services) { services.AddSingleton<IConfiguration>(Configuration); // DbContext using an InMemory database provider services.AddDbContext<AppDbContext>(opt => opt.UseInMemoryDatabase()); } // Other Startup code ... }
  36. 36. Киев 2017Architecture & Development of .NET Core Applications
  37. 37. Киев 2017 .NET Core Apps :: Health Cheks Architecture & Development of .NET Core Applications • https://github.com/aspnet/HealthChecks • src/common • src/Microsoft.AspNetCore.HealthChecks • src/Microsoft.Extensions.HealthChecks • src/Microsoft.Extensions.HealthChecks.SqlServer • src/Microsoft.Extensions.HealthChecks.AzureStorage
  38. 38. Киев 2017 .NET Core Apps :: Health Checks Architecture & Development of .NET Core Applications public class Program { public static void Main(string[] args) { var host = new WebHostBuilder() .UseKestrel() .UseHealthChecks("/hc) .UseContentRoot(Directory.GetCurrentDirectory()) .UseIISIntegration() .UseStartup<Startup>() .Build(); host.Run(); } }
  39. 39. Киев 2017 .NET Core Apps :: Health Checks Architecture & Development of .NET Core Applications public class Startup { public void ConfigureServices(IServiceCollection services) { // Add health checks here. services.AddHealthChecks(checks => { checks.AddUrlCheck(“URL Check" ) .AddHealthCheckGroup("servers", group => group .AddUrlCheck("https://myserviceurl::8010") .AddUrlCheck("https://tmysecondserviceurl:7777")) } services.AddMvc(); } }
  40. 40. Киев 2017 .NET Core Apps :: Health Checks Architecture & Development of .NET Core Applications checks.AddSqlCheck("MyDatabase", Configuration["ConnectionString"]); checks.AddAzureBlobStorageCheck("accountName", "accountKey"); checks.AddAzureBlobStorageCheck("accountName", "accountKey", "containerName"); checks.AddAzureTableStorageCheck("accountName", "accountKey"); checks.AddAzureTableStorageCheck("accountName", "accountKey", "tableName"); checks.AddAzureFileStorageCheck("accountName", "accountKey"); checks.AddAzureFileStorageCheck("accountName", "accountKey", "shareName"); checks.AddAzureQueueStorageCheck("accountName", "accountKey"); checks.AddAzureQueueStorageCheck("accountName", "accountKey", "queueName");
  41. 41. Киев 2017 .NET Core Apps :: Health Checks Architecture & Development of .NET Core Applications checks.AddHealthCheckGroup("memory", group => group.AddPrivateMemorySizeCheck(1) .AddVirtualMemorySizeCheck(2) .AddWorkingSetCheck(1), CheckStatus.Unhealthy) .AddCheck("thrower", Func<IHealthCheckResult>) (() => { throw new DivideByZeroException(); })) .AddCheck("long-running", async cancellationToken => { await Task.Delay(10000, cancellationToken); return HealthCheckResult.Healthy("I ran too long"); }) .AddCheck<CustomHealthCheck>("custom");
  42. 42. Киев 2017 Service Fabric Health Monitoring Architecture & Development of .NET Core Applications fabric:/System
  43. 43. Киев 2017 Service Fabric Health Hierarchy Architecture & Development of .NET Core Applications Cluster Nodes Applications Deployed Applications Deployed Service Packages Services Partitions Replicas
  44. 44. Киев 2017 Cluster Health Policy Architecture & Development of .NET Core Applications <FabricSettings> <Section Name="HealthManager/ClusterHealthPolicy"> <Parameter Name="ConsiderWarningAsError" Value="False" /> <Parameter Name="MaxPercentUnhealthyApplications" Value=“10" /> <Parameter Name="MaxPercentUnhealthyNodes" Value=“10" /> <Parameter Name="ApplicationTypeMaxPercentUnhealthyApplications- YourApplicationType" Value="0" /> </Section> </FabricSettings> • Consider Warning as Error • Max Percent Unhealthy Applications • Max percent Unhealthy Nodes • Application Type Health Policy Map
  45. 45. Киев 2017 Service Fabric :: Health Reports Architecture & Development of .NET Core Applications private static Uri ApplicationName = new Uri("fabric:/MyApplication"); private static string ServiceManifestName = “MyApplication.Service"; private static string NodeName = FabricRuntime.GetNodeContext().NodeName; private static Timer ReportTimer = new Timer(new TimerCallback(SendReport), null, 3000, 3000); private static FabricClient Client = new FabricClient(new FabricClientSettings() { HealthOperationTimeout = TimeSpan.FromSeconds(120), HealthReportSendInterval = TimeSpan.FromSeconds(0), HealthReportRetrySendInterval = TimeSpan.FromSeconds(40)}); public static void SendReport(object obj) { // Test whether the resource can be accessed from the node HealthState healthState = TestConnectivityToExternalResource(); var deployedServicePackageHealthReport = new DeployedServicePackageHealthReport( ApplicationName, ServiceManifestName, NodeName, new HealthInformation("ExternalSourceWatcher", "Connectivity", healthState)); Client.HealthManager.ReportHealth(deployedServicePackageHealthReport); }
  46. 46. Киев 2017 Service Fabric + App Insights Architecture & Development of .NET Core Applications https://github.com/DeHeerSoftware/Azure-Service-Fabric-Logging-And-Monitoring Serilog.Sinks.ApplicationInsights
  47. 47. Киев 2017Architecture & Development of .NET Core Applications Thank you!

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