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Building the layered server application achieved by InversifyJS
OKUNOKENTARO
December 01, 2019
Technology
1
3.1k
Building the layered server application achieved by InversifyJS
The slide that used when I talked in JSConf JP.
OKUNOKENTARO
December 01, 2019
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Transcript
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+4$POG+1 8IZ Screen before redesigned Schema before redesigned Redesigned screen
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+4$POG+1 8IBUTIPVMEXFEP Redesigned screen Schema unaffected by a screen design
Abstract interface
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class UserId { readonly value: string; constructor() { this.value =
uuid(); } } /PUHPPE
function makeUserId(): UserId { return new UserId(uuid()); } function makeUserIdMock(mockValue:
string): UserId { return new UserId(mockValue); } class UserId { constructor(readonly value: string) {} } #FUUFS
class UsersRepository { private readonly db: Knex; constructor() { this.db
= knex(config); } } /PUHPPE
class UsersRepository { constructor( private readonly db: DatabaseProvider ) {}
} #FUUFS
class UsersGetMediator { async handle(req: Request, res: Response) { const
repo = new UsersRepository( new DatabaseProvider(), ); const users = await repo.getAll(); // Processing to send response } } )NNN
class Application { private router: Router; constructor() { this.router =
new Router( new UsersGetMediator( new UsersRepository( new DatabaseProvider(), ) ) ) } } :PVLOPX
class Application { private router: Router; constructor() { this.router =
new Router( new UsersGetMediator( new UsersRepository( new DatabaseProvider(), ) ) ) } } )!%0,&/
*TUIJTPLBZ
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import { injectable } from 'inversify'; @injectable() export class Application
{ constructor( private readonly auth: AuthService, private readonly router: Router, private readonly express: ExpressProvider, ) {} main() { this.auth.prepare(); this.router.prepare(); this.express.listen(); } } *OKFDUBCMFEFDPSBUPS
@injectable() export class UsersGetMediator { constructor( private readonly auth: AuthService,
private readonly permissionVerifier: PermissionVerifier, private readonly errorHandler: ErrorHandler, private readonly usersRepo: UsersRepository, ) {} async handle(req: Request, res: Response) { if (!(await this.auth.isAuthenticated(req))) { return this.errorHandler.unauthorized(res); } if (!(await this.permissionVerifier.canReadUsers(req.user.id))) { return this.errorHandler.forbidden(res); } const users = await this.usersRepo.getAll(); const body: UsersGetResponse = { users: users.serialize(), }; res.send(body).end(); } }
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I was going to introduce the trick here...
But I have found it...
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Database Provider Reader Writer
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Database Provider Reader Writer Http Request (Not TS) Domain model Data access object Knex.js ORM Raw SQL Query (Not TS)
+4$POG+1 Express Http Handler (Router) Google Cloud SQL Mediator Repository
Database Provider Reader Writer Serialized JSON (Not TS) Domain model Data transfer object Results as JSON (Not TS)
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