Microservice Architecture. The foundation of microservice architecture (MSA) is about developing a single application as a suite of small and independent services that are running in their own process, developed and deployed independently1. For some services, a relational database is the best choice. Other services might need a NoSQL database such as MongoDB, which is good at storing complex, unstructured data, or Neo4J, which is designed to efficiently store and query graph data. Use a (single) database that is shared by multiple services. Simple data-driven/CRUD microservice design. The previous diagram shows the logical Catalog microservice, that includes its Catalog database, which can be or not in the same Docker host. Having the database in the same Docker host might be good for development, but not for production.
- Generate Numeric Key For Db In Microservice Architecture Software
- Generate Numeric Key For Db In Microservice Architecture 2017
- Generate Numeric Key For Db In Microservice Architecture Definition
- Generate Numeric Key For Db In Microservice Architecture Model
This section outlines how to create a simple microservice that performs create, read, update, and delete (CRUD) operations on a data source.
Designing a simple CRUD microservice
From a design point of view, this type of containerized microservice is very simple. Perhaps the problem to solve is simple, or perhaps the implementation is only a proof of concept.
Figure 6-4. Internal design for simple CRUD microservices
An example of this kind of simple], as shown in the ConfigureServices method in an earlier code example.
However, for production environments, you might want to explore additional ways on how to store secrets like the connection strings. An excellent way to manage application secrets is using Azure Key Vault.
Azure Key Vault helps to store and safeguard cryptographic keys and secrets used by your cloud applications and services. A secret is anything you want to keep strict control of, like API keys, connection strings, passwords, etc. and strict control includes usage logging, setting expiration, managing access, among others.
Azure Key Vault allows a very detailed control level of the application secrets usage without the need to let anyone know them. The secrets can even be rotated for enhanced security without disrupting development or operations.
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Applications have to be registered in the organization's Active Directory, so they can use the Key Vault.
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Generate Numeric Key For Db In Microservice Architecture Software
Implementing versioning in ASP.NET Web APIs
As business requirements change, new collections of resources may be added, the relationships between resources might change, and the structure of the data in resources might be amended. Updating a Web API to handle new requirements is a relatively straightforward process, but you must consider the effects that such changes will have on client applications consuming the Web API. Although the developer designing and implementing a Web API has full control over that API, the developer does not have the same degree of control over client applications that might be built by third party organizations operating remotely.
Versioning enables a Web API to indicate the features and resources that it exposes. A client application can then submit requests to a specific version of a feature or resource. There are several approaches to implement versioning:
URI versioning
Query string versioning
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Query string and URI versioning are the simplest to implement. Header versioning is a good approach. However, header versioning not as explicit and straightforward as URI versioning. Because URL versioning is the simplest and most explicit, the eShopOnContainers sample application uses URI versioning.
With URI versioning, as in the eShopOnContainers sample application, each time you modify the Web API or change the schema of resources, you add a version number to the URI for each resource. Existing URIs should continue to operate as before, returning resources that conform to the schema that matches the requested version.
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As shown in the following code example, the version can be set by using the Route attribute in the Web API controller, which makes the version explicit in the URI (v1 in this case).
This versioning mechanism is simple and depends on the server routing the request to the appropriate endpoint. However, for a more sophisticated versioning and the best method when using REST, you should use hypermedia and implement HATEOAS (Hypertext as the Engine of Application State).
Additional resources
Scott Hanselman. ASP.NET Core RESTful Web API versioning made easy
https://www.hanselman.com/blog/ASPNETCoreRESTfulWebAPIVersioningMadeEasy.aspxVersioning a RESTful web API
https://docs.microsoft.com/azure/architecture/best-practices/api-design#versioning-a-restful-web-apiRoy Fielding. Versioning, Hypermedia, and REST
https://www.infoq.com/articles/roy-fielding-on-versioning
Generating Swagger description metadata from your ASP.NET Core Web API
Swagger is a commonly used open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs. It is becoming the standard for the APIs description metadata domain. You should include Swagger description metadata with any kind of microservice, eitherll cover in some detail in this guide but there's also the option to use NSwag, which can generate Typescript and C# API clients, as well as C# controllers, from a Swagger or OpenAPI specification and even by scanning the .dll that contains the controllers, using NSwagStudio.
Generate Numeric Key For Db In Microservice Architecture 2017
How to automate API Swagger metadata generation with the Swashbuckle NuGet package
Generating Swagger metadata manually (in a JSON or YAML file) can be tedious work. However, you can automate API discovery of ASP.NET Web API services by using the Swashbuckle NuGet package to dynamically generate Swagger API metadata.
Swashbuckle automatically generates Swagger metadata for your ASP.NET Web API projects. It supports ASP.NET Core Web API projects and the traditional ASP.NET Web API and any other flavor, such as Azure API App, Azure Mobile App, Azure Service Fabric microservices based on ASP.NET. It also supports plain Web API deployed on containers, as in for the reference application.
Swashbuckle combines API Explorer and Swagger or swagger-ui to provide a rich discovery and documentation experience for your API consumers. In addition to its Swagger metadata generator engine, Swashbuckle also contains an embedded version of swagger-ui, which it will automatically serve up once Swashbuckle is installed.
This means you can complement your API with a nice discovery UI to help developers to use your API. 1.14.4 optifine download mac os. It requires a very small amount of code and maintenance because it is automatically generated, allowing you to focus on building your API. The result for the API Explorer looks like Figure 6-8.
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Figure 6-8. Swashbuckle API Explorer based on Swagger metadata—eShopOnContainers catalog microservice
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Currently, Swashbuckle consists of five internal NuGet packages under the high-level meta- package Swashbuckle.AspNetCore for ASP.NET Core applications.
Generate Numeric Key For Db In Microservice Architecture Definition
After you have installed these NuGet packages in your Web API project, you need to configure Swagger in the Startup class, as in the following simplified code:
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Once this is done, you can start your application and browse the following Swagger JSON and UI endpoints using URLs like these:
You previously saw the generated UI created by Swashbuckle for a URL like http://<your-root-url>/swagger. In Figure 6-9 you can also see how you can test any API method.
Figure 6-9. Swashbuckle UI testing the Catalog/Items API method
The Swagger UI API detail shows a sample of the response and can be used to execute the real API, which is great for developer discovery. Figure 6-10 shows the Swagger JSON metadata generated from the eShopOnContainers microservice (which is what the tools use underneath) when you request http://<your-root-url>/swagger/v1/swagger.json using Postman.
Figure 6-10. Swagger JSON metadata
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It is that simple. And because it is automatically generated, the Swagger metadata will grow when you add more functionality to your API.
Additional resources
Generate Numeric Key For Db In Microservice Architecture Model
ASP.NET Web API Help Pages using Swagger
https://docs.microsoft.com/aspnet/core/tutorials/web-api-help-pages-using-swaggerGet started with Swashbuckle and ASP.NET Core
https://docs.microsoft.com/aspnet/core/tutorials/getting-started-with-swashbuckleGet started with NSwag and ASP.NET Core
https://docs.microsoft.com/aspnet/core/tutorials/getting-started-with-nswag