![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/ApiGateway.png\")
<\/figure>\n<\/figure>\n\n\n\nA Sample Project Making<\/h5>\n\n\n\n
We will write two microservices in the visual studio environment and route them with the api gateway.<\/p>\n\n\n\n
Let's open as blank project and add services <\/strong>folder and ApiGateway as .net 5.0 api<\/strong><\/p>\n\n\n\n Let's add two project named UserService <\/strong>and BookService <\/strong>to the services folder. Each other will be entirely independent these services which designed as Domain Driven Design<\/strong><\/p>\n\n\n\n Folder Strcuture of Project is ready. Let's add BookService<\/strong>and BookService<\/strong>. BookService will return book info, add get action to Book Controller and the parametre of their is isbn as string. with Book?isbn=\"asd\"<\/strong> url will return book info without database, using static list<\/p>\n\n\n\n Let's create folders named services to Book.Domain and Book.Infastructure, add IBookService <\/strong> and BookService<\/strong> to these folders<\/p>\n\n\n\n DTOS\/BookDTO.cs<\/strong><\/p>\n\n\n\n IBookService<\/strong><\/p>\n\n\n\n BookService <\/strong>:<\/p>\n\n\n\n Let's make dependecy injection<\/p>\n\n\n\n BookController<\/strong>:<\/p>\n\n\n\n Let's set the Book.API layer a startup as project then when we test with a url like api\/book?isbn=test, we can sucessfully see the data in response. Thus for now we completed the book service<\/p>\n\n\n\n User service will be like Book service. The parameter wil be username<\/strong>.<\/p>\n\n\n\n Bu b\u00f6l\u00fcm kitap servisinin neredeyse ayn\u0131s\u0131 oldu\u011fu i\u00e7in sadece UserController <\/strong>ve IUserService’i <\/strong>g\u00f6sterece\u011fim<\/p>\n\n\n\n UserController<\/strong>:<\/p>\n\n\n\n IUserService<\/strong>:<\/p>\n\n\n\n In this section we added UserService, IUserService, UserController same as BookService. when we test with a url like api\/user?username=test, we can sucessfully see the data in response. Let's go gateway <\/strong>create.<\/p>\n\n\n\n First of all, let's talk about why we need api gateway.<\/strong> The two services we do will work on different ports, maybe on different machines. We will can request to these services at client, connecting different port on every request will be hard api management at client, instead having all our services at a single point will facilitate api management.<\/p>\n\n\n\n![\"Api-gateway-solution\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/Screenshot_87.png\")
<\/figure>\n<\/figure>\n\n\n\n![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/ApiGateway_Services_DDD.png\")
<\/figure>\n<\/figure>\n\n\n\n![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/BookService.png\")
<\/figure>\n<\/figure>\n\n\n\nnamespace Book.Domain.Models\n{\n public class BookDTO\n {\n public string ISBN { get; set; }\n public string Title { get; set; }\n public string Author { get; set; }\n public int PageCount { get; set; }\n public string PublisherName { get; set; }\n }\n}\n<\/pre><\/div>\n\n\n\nusing Book.Domain.Models;\n\nnamespace Book.Domain.Services\n{\n public interface IBookService\n {\n BookDTO GetBookByISBN(string isbn);\n }\n}<\/pre><\/div>\n\n\n\nusing Book.Domain.Models;\nusing Book.Domain.Services;\n\nnamespace Book.Infastructure.Services\n{\n public class BookService : IBookService\n {\n public BookDTO GetBookByISBN(string isbn)\n {\n if (string.IsNullOrEmpty(isbn))\n {\n return null;\n }\n var book = new BookDTO\n {\n Author = \"J.R.R Tolkien\",\n ISBN = isbn,\n PageCount = 1012,\n PublisherName = \"Metis Yay\u0131nevi\",\n Title = \"Y\u00fcz\u00fcklerin Efendisi Tek Cilt \u00d6zel Bas\u0131m\"\n };\n return book;\n }\n }\n}<\/pre><\/div>\n\n\n\nservices.AddScoped<IBookService, BookService>();<\/pre><\/div>\n\n\n\n
[Route(\"api\/[controller]\")]\n [ApiController]\n public class BookController : ControllerBase\n {\n private readonly IBookService BookService;\n public BookController(IBookService bookService)\n {\n BookService = bookService;\n }\n public ActionResult Get(string isbn)\n {\n var book = BookService.GetBookByISBN(isbn);\n return Ok(book);\n }\n }<\/pre><\/div>\n\n\n\n[Route(\"api\/[controller]\")]\n [ApiController]\n public class UserController : ControllerBase\n {\n private readonly IUserService UserService;\n public UserController(IUserService userService)\n {\n UserService = userService;\n }\n public ActionResult Get(string username)\n {\n var dto = UserService.GetUserByUsername(username);\n return Ok(dto);\n }\n }<\/pre><\/div>\n\n\n\nnamespace User.Domain.Services\n{\n public interface IUserService\n {\n UserDTO GetUserByUsername(string username);\n }\n}<\/pre><\/div>\n\n\n\nnamespace User.Domain.DTOS\n{\n public class UserDTO\n {\n public string Username { get; set; }\n public string Name { get; set; }\n public string Surname { get; set; }\n public DateTime? BirthDate { get; set; }\n public int? Age => BirthDate.HasValue ? DateTime.Now.Year - BirthDate.Value.Year : (int?)null;\n }\n}<\/pre><\/div>\n\n\n\nApi Gateway<\/h5>\n\n\n\n
![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/Ocel-Nuget.png\")
<\/figure>\n<\/figure>\n\n\n\n![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/Solution_ApiGateway_Settings.png\")
<\/figure>\n<\/figure>\n\n\n\n![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/User_Request.png\")
<\/figure>\n<\/figure>\n\n\n\n![\"\"](\"https:\/\/okankaradag.com\/wp-content\/uploads\/2021\/06\/Screenshot_21-1024x225.png\")
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