ocelot api gateway documentation

The following is a very basic ocelot.json. We use the distributed version of the Spring PetClinic sample application as the target application in our demo. We make all features available to any user who wants to host the API gateway whether in a single node or a clustered environment. Then follow the Startup below and Configuration sections to get up and running. The code for the Ocelot integration can be found here. Figure 6-28. eShopOnContainers architecture with API Gateways. However it will work with anything that speaks HTTP and run on any platform that ASP.NET Core supports. On the other hand, when you use the aggregator pattern, you can see how the arrows in blue would simplify the communication from a client app perspective. That configuration.json is where you specify all the API Gateway ReRoutes, meaning the external endpoints with specific ports and the correlated internal endpoints, usually using different ports. Because of that previous code, and as shown in the Visual Studio Explorer below, the only file needed to define each specific business/BFF API Gateway is just a configuration.json file, because the four API Gateways are based on the same Docker image. Ocelot supports rate limiting of upstream requests so that your downstream services do not become overloaded. By default, documentation parts are included, but integrations and authorizers are excluded, when you export an API. @Pwncic-1987. Figure 4-12. API Gateway created using .NET core. Ocelot is a bunch of middlewares in a specific order. Because eShopOnContainers application has split the API Gateway into multiple BFF (Backend for Frontend) and business areas API Gateways, another option would have been to create an additional API Gateway for cross-cutting concerns. I would suggest taking a look at introduction first. As a definition, an Ingress is a collection of rules that allow inbound connections to reach the cluster services. OK so to get rate limiting working for a Route you need to add the following json to it. That choice would be fair in a more complex microservice based architecture with multiple cross-cutting concerns microservices. Figure 6-35. Since there's only one cross-cutting concern in eShopOnContainers, it was decided to just handle the security service out of the API Gateway realm, for simplicity's sake. This command only runs the catalog-api service container plus dependencies that are specified in the docker-compose.yml. Having the API Gateway's boundaries dictated by the business or domain will help you to get a better design. Since eShopOnContainers is using multiple API Gateways with boundaries based on BFF and business areas, the Identity/Auth service is left out of the API Gateways, as highlighted in … Thanks very much. In that example, when the authorization middleware is called, Ocelot will find if the user has the claim type 'UserType' in the token and if the value of that claim is 'employee'. However, Ocelot also supports sitting the Identity/Auth microservice within the API Gateway boundary, as in this other diagram. This package also adds middleware that modifies swagger.json from downstream services under ocelot.json. This feature was added by @geffzhang on GitHub! In an Ocelot API Gateway you can sit the authentication service, such as an ASP.NET Core Web API service using IdentityServer providing the auth token, either out or inside the API Gateway. Ocelot is a .NET API Gateway. This feature was added by @geffzhang on GitHub! Revision 9abd47b0. Contribute to Adekoreday/Ocelot development by creating an account on GitHub. Normally, you won't be deploying with docker-compose into a production environment because the right production deployment environment for microservices is an orchestrator like Kubernetes or Service Fabric. Figure 6-38. For this specific reason, why you want to use the API Gateway, to avoid the direct communication between the client apps and the microservices. API gateway with ASP.NET Core and Ocelot So, let's disccuss a bit and implement an API gateway using the Ocelot framework . Ocelot … Ocelot is an API Gateway. Ocelot is an API Gateway. Those external ports shouldn't be published when deploying to a production environment. Because the Ocelot WebHost is configured with the authenticationProviderKey = "IdentityApiKey", that will require authentication whenever that service has any requests without any auth token. Accessing a microservice through a URL provided by the API Gateway. This project is aimed at people using .NET running a micro services / service oriented architecture that need a unified point of entry into their system. By splitting the API Gateway into multiple API Gateways, different development teams focusing on different subsets of microservices can manage their own API Gateways by using independent Ocelot configuration files. Ocelot supports rate limiting of upstream requests so that your downstream services do not become overloaded. But the application is configured so it accesses all the microservices through the API Gateways, not through the direct port "shortcuts". For instance, let's focus on one of the ReRoutes in the configuration.json from above, the configuration for the Basket microservice. Then in your Program.cs you will want to have the following. A possible approach is to use a direct client-to-microservice communication architecture. Sample Web API microservice (Catalog microservice). This project is aimed at people using .NET running a micro services / service oriented architecture that need a unified point of entry into their system. Ocelot currently only supports this in the form of another http request (in the future this could be any transport mechanism). The only file needed to define each API Gateway / BFF with Ocelot is a configuration file. Using the API Gateway REST API, you can also explicitly set the extension=documentation,integrations,authorizers query parameter to include the API documentation parts, API integrations and authorizers in an API export. Ocelot is basically a set of middlewares that you can apply in a specific order. Figure 6-37. eShopOnContainers architecture with aggregator services. The ingress, however, is just redirecting HTTP requests but not trying to hide any microservice or web app. Next, in the API Gateway project, we define SwaggerUI to display interactive Swagger documentation. The main functionality of an Ocelot API Gateway is to take incoming HTTP requests and forward them on to a downstream service, currently as another HTTP request. In this case, the SQL Server container and RabbitMQ container. In addition, the API Gateways might hide certain internal microservices. Thanks for taking a look at the Ocelot documentation. You could also implement request aggregation with the Request Aggregation feature in Ocelot, but it might not be as flexible as you need. When Ocelot runs, it will look at the ReRoutes AuthenticationOptions.AuthenticationProviderKey and check that there is an Authentication Provider registered with the given key. This project is aimed at people using .NET running a micro services / service oriented architecture that need a unified point of entry into their system. The UpstreamPathTemplate is the URL that Ocelot will use to identify which DownstreamPathTemplate to use for a given request from the client. Microservice folders in eShopOnContainers solution in Visual Studio. inspectIT Ocelot Demo. In addition, the infrastructure assets such as databases, cache, and message brokers should be offloaded from the orchestrator and deployed into high available systems for infrastructure, like Azure SQL Database, Azure Cosmos DB, Azure Redis, Azure Service Bus, or any HA clustering solution on-premises. Please note you will need to choose one of the Ocelot packages from the NuGet feed. In ocelot you need to do the following if you wish to trace a Route. About the Identity service, in the design it's left out of the API Gateway routing because it's the only cross-cutting concern in the system, although with Ocelot it's also possible to include it as part of the rerouting lists. The way you secure with authentication any service at the API Gateway level is by setting the AuthenticationProviderKey in its related settings at the configuration.json. That way, the clients still call the same base URL but the requests are routed to multiple API Gateways or BFF. .NET core API Gateway. In Kubernetes, if you don't use any ingress approach, then your services and pods have IPs only routable by the cluster network. In eShopOnContainers, we're using a single Docker container image with the Ocelot API Gateway but then, at run time, we create different services/containers for each type of API-Gateway/BFF by providing a different configuration.json file, using a docker volume to access a different PC folder for each service. Ocelot plays an important role in .NET core microservices and service-oriented architecture that need a unified point of entry into their system. DownstreamHostAndPorts is an array that contains the host and port of any downstream services that you wish to forward requests to. This is pretty much all you need to get going. I've read two great articles, the microservices.io and the Microsoft documentation that help me a lot to understand the use of the API gateway. Also, latest Ocelot version contains a breaking change on its json schema. And you can avoid that by setting the additional level of indirection of the API Gateway (Ocelot, in this case).

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