Hello I am applying a microservices architecture, but I ran into a known problem such as authentication to my apis. Api-gateway may be going to dozens of microservices inside to respond to this request. Add New Blank Web project under below location and name; For API Gateway microservices, we have to libraries in our Nuget Packages. For that, we can create a simple extension method, that we can share within our services. Software/Solutions Architect, Udemy Instructor, Working on Cloud-Native and Serverless Event-driven Microservices Architectures https://github.com/mehmetozkaya, Various String Formatting approaches in Python, FORESIGHT(2022): Summer Internship at Microsoft | Compilation, 14 Best+Free Data Science with Python Online Courses- [Bestseller 2021], Why Traditional Scientists Make Good Developers, public void ConfigureServices(IServiceCollection services). The reason is Swagger installed by default. Looking forward with Authentication support version. Software Engineer at KBS Technologies Pvt ltd. Logging/Tracing/Correlation etc.. For more feature lists you should visit the official website. It is a common practice in Microservice Architectures, however, it also enables you to combine multiple REST APIs provided by different applications into a single HTTP(S) address. The world is struggling with the Covid 19 and the coronavirus is increasing day by day. In order to configure and use Ocelot in Asp.Net Core project, we should define Ocelot methods into Startup.cs. Since I have several microservices, I don't want to handle the authentication in each one of them so I implemented an api gateway with Ocelot for net core 3 to handle the requests. Use a gateway to aggregate multiple individual requests into a single request. Unchecked for https because we dont use https for our apis now. Now change the password on line 27 to "foobar" and run it again. Living Life in Retirement to the full This chattiness between a client and a backend can adversely impact the performance and scale of the application. As part of the gateway model, request aggregation, you can aggregate multiple client requests into a single client request, often targeting multiple internal microservices.With this approach, the client application sends a single request to the API Gateway, which sends several requests to internal microservices and then collects the results and sends everything back to the client application. This article is part of Ocelot GW tutorial series which explains need of API Gateway and how to use Ocelot with ASP.net Core application as API gateway.. Before you start this tutorial, make sure you have gone through previous post.. By the way, this is a very easy demo; there are some important things I did not mention in this . Finally, we need to register our configuration and hosted service with Consul dependencies to dependency injection container. In order to use it, inject HttpClient object with Client Factory in Startup.cs. Ocelot is an open source API gateway implemented with. When a client needs to consume multiple services, setting up a separate endpoint for each service and having the client manage each endpoint can be challenging. Use application Layer 7 routing to route the request to the appropriate instances. Browse Top .NET Core Developers In my last article, Building API Gateway Using Ocelot In ASP.NET Core, I introduced how we can use Ocelot to build our API Gateway with the simplest demo.In this article, I will continue with the topic of Building API Gateway In ASP.NET Core and will show you something about authentication later.. As all we know, API services are protected resources. Folder Structure Configuring the Ocelot API Gateway Select ASP.NET Core Web Application, give your project a name and select OK. Creating an empty ASP.NET Core project and add the following two packages via .NET Core CLI. we can start to implement API Gateway based on .NET Core and Ocelot in less than 30 lines . Below we can see the implementation of Ocelot API Gateway service, that uses our configuration file and Consul as a service registry. Now its time to make docker the APIGateway project with our existing microservices image. After all the configurations start all projects without debugging mode and open the Postman application. However, we will introduce a component that can become a single point of failure to our system, so we need to deploy at least two replicas of it to have high availability and scale up depending on load. Here is the official page Ocelot https://ocelot.readthedocs.io/. These are 2 design patterns. Learn on the go with our new app. The next step is to build the API gateway. You install Ocelot and its dependencies in your ASP.NET Core project with Ocelots NuGet package, from Visual Studio. So if API needs any claims info it can access via . Of course these requests will have token so Ocelot api gateway also carry this token when calling to internal systems.Also as you can see that we had summarized the api calls remove api path and use only /Catalog path when exposing apis for the client application. Ocelot is designed to work with ASP.NET Core only. You can create your own BFF backend for frontend microservices for aggreagotr or api gateway operations. Create the API Gateway Choose Empty as a template with the same .Net Core 3.1 Version. -> Click on Create. Rate Limiting Ocelothttps://ocelot.readthedocs.io/en/latest/features/ratelimiting.html. We simply enhance from the previous point, let API gateway do the authorization then transform and forward the required claims as part of headers. We are going to do response Caching in Ocelot Api Gateway with Configuring Ocelot.json File. Nice Article!. And Aggregate multiple client requests with consuming Catalog, Basket and Ordering internal microservices. There are two sections to the configuration- an array of ReRoutes and a GlobalConfiguration. In which I am adding a claim as Role. You can check microservices as below urls : As you can see that, we have tested Ocelot API Gw with Routing features on docker environment. In the next window, select .Net Core and ASP.Net Core latest version and select Web API and then uncheck Configure for HTTPS selection and click OK. Lets begin by defining docker-compose.yml file, which contains definitions of services that we are going to use: As we can see docker-compose.yml doesnt contain any configurations for services, for that purpose, we are going to use docker-compose.override.yml file: As we can see from the configuration file, there is no way for services to know about each other existence. After we have defined our configuration we can start to implement API Gateway based on .NET Core and Ocelot in less than 30 lines. Select ASP.NET Core Web Application, give your project a name and select OK. Lastly we call Order microservices to get user existing orders. In typical API gateway environment where API gateway is responsible for doing the authentication and authorization. This pattern is a service that provides a single-entry point for certain groups of microservices. Install Ocelot NuGet package, to do this, right click on Project and select Manage NuGet packages. They also have a very detailed documentation. Firstly I created a Visual Studio blank application. Learn on the go with our new app. This is the default Web API template selected. DevOps as a Service. Once unsuspended, bseyhan will be able to comment and publish posts again. In this article, we are going to have two microservices, API Gateway and Consul service. According to the configurations, Ocelot manipulates the HttpRequest object created by request from the client. Ocelot is an Open-Source API Gateway for the .NET/Core Platform which is officially supported by Microsoft. To perform a single task, a client may have to make multiple calls to various backend services. Its lightweight, fast, and scalable and provides routing and authentication among many other features. mercury forums. The API Gateway pattern is also sometimes known as the Backend For Frontend (BFF) because you build it while thinking about the needs of the client app. If the service is shutting down it deregisters service from Consul. using Ocelot.DependencyInjection; using Ocelot.Middleware; var builder = WebApplication.CreateBuilder (args); builder.Configuration.AddOcelot ()// 1.ocelot . Client only send the username of 1 api exposing from shopping.aggragetor microservices.Reduce chattiness between the client apps and the backend APIImplement the Gateway aggregation pattern in Shopping.Aggregator Similar to Custom api Gateway implementation. DownstreamPathTemplate is /api/customer, UpstreamPathTemplate is /customer-service/customer/{id} If you want to learn new technologies you should visit my Dev and Github account. var orders = await _orderService.GetOrdersByUserName(userName); https://ocelot.readthedocs.io/en/latest/features/ratelimiting.html, https://ocelot.readthedocs.io/en/latest/features/caching.html, http://localhost:8010/Catalog/6022a3879745eb1bf118d6e2, http://localhost:8010/Catalog/GetProductByCategory/Smart, https://docs.microsoft.com/en-us/dotnet/architecture/microservices/multi-container-microservice-net-applications/implement-api-gateways-with-ocelot, https://docs.microsoft.com/en-us/dotnet/architecture/microservices/architect-microservice-container-applications/direct-client-to-microservice-communication-versus-the-api-gateway-pattern, https://www.youtube.com/watch?v=hlUGZ6Hmv6s, https://codewithmukesh.com/blog/microservice-architecture-in-aspnet-core/, https://www.youtube.com/watch?v=UsoH5cqE1OA, https://myview.rahulnivi.net/api-gateway-envoy-docker/, https://code-maze.com/api-gateway-pattern-dotnet-encapsulate-microservices/, https://medium.com/streamwriter/api-gateway-aspnet-core-a46ef259dc54, Install Visual Studio 2019 v16.x or above, Client app sends a single request to the API Gateway that dispatches several requests to the internal microservices. You should see output like this: If you get an error double check the first-time configuration settings above. In this video, we closely examined API Gateway, one of the components of. Every first request coming to UpstreamPathTemplate after that goes to DownstreamPathTemplate. If bseyhan is not suspended, they can still re-publish their posts from their dashboard. All versions can be found here. An API Gateway is basically an interface. In this article, you will learn an easy way to build your API Gateway using Ocelot in ASP.NET Core. Do you have another version using Ocelot with .NET 5 that can support a custom Identity Api (Web Api with asp.net core identity) for authentication? We are going to routing operations over the Catalog, Basket and Ordering microservices. Added the following NuGet packages 1<PackageReference Include="Ocelot" Version="13.8.0" /> 2<PackageReference Include="Serilog" Version="2.9.0" /> maximum admitted 1 per 5s. // This method gets called by the runtime. I just want to say "Do not go anywhere stay at home and protect yourself". API GW are also known as backend for frontends (since front end only knows about API GW endpoints not actual services). Dockerfile and docker-compose files are created. The important part here is that each element we define in the Routes series represents a service. In this article, we are going to use Ocelot and .NET Core Web API for API Gateway implementation and HashiCorp Consul for service discovery. After that, we should add required nuget package; As you can see that, we have perform response caching in Ocelot Api Gateway with Configuring Ocelot.json File. Its similar to the Facade pattern from object-oriented design, but in this case, its part of a distributed system. The latest version of the package targets .NETCoreApp 3.1 and hence it is not suitable for .NET Framework applications. await _client.Agent.ServiceDeregister(registration.ID, cancellationToken); public async Task StopAsync(CancellationToken cancellationToken), public static void RegisterConsulServices(this IServiceCollection services, ServiceConfig serviceConfig) {, https://github.com/Skisas/ApiGateway-example. We simply enhance from the previous point, let API gateway do the authorization then transform and forward the required claims as part of headers. The code below is implemented as a background task, that registers the service in Consul by overriding previous information about service if such existed. Here is the official page Ocelot https://ocelot.readthedocs.io/. Install-Package Ocelot. In the ocelot.json file provided below we can see that we are forwarding HTTP GET requests from /api/ordering and /api/logistics to internal services. In UpstreamPathTemplate, we specify which path the user writes to this api url. The gateway receives client requests, dispatches requests to the various backend systems, and then aggregates the results and sends them back to the requesting client. JWT Token Authentication. I've been using ocelot with a hobby project and so far its working pretty well (connected to 4 microservices) - originally using azure APIM but the consumption plan and start up cost was too much and the next level up just wasnt cost effective for a personal project *I do believe that once I'm ready to go to production I may switch to APIM though. This method have some disadvantage as token parsing code is repeated but at the same time it is also giving us more control for more granular authorization. Of Coins you can apply in a specific order ) // 1.ocelot by. This way HttpClient Factory registiration will mention our routing details in this video, we which! 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