oak_nest

Rely on oak@v10.1.0 to simulate some annotation functions of nestjs which is a frame for nodejs.

I will update the oak version if need.

run

deno run --allow-net --allow-env --allow-write --unstable --config tsconfig.json example/main.ts

or you can use denon：

denon dev

Demo

Controller

Decorators Module、Controller、Injectable、UseGuards、Get、Post、Body、Headers、Query、Res、Req now are available：

import {
  Body,
  Context,
  Controller,
  createParamDecorator,
  createParamDecoratorWithLowLevel,
  ForbiddenException,
  Get,
  Headers,
  Post,
  Query,
  Res,
  UseGuards,
} from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import type { CanActivate } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import mockjs from "https://deno.land/x/deno_mock@v2.0.0/mod.ts";
import { delay } from "https://deno.land/std/async/mod.ts";

class AuthGuard implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    console.log("--AuthGuard---");
    await delay(100);
    // throw new ForbiddenException('this is AuthGuard error');
    return true;
  }
}

class AuthGuard2 implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    console.log("--AuthGuard2---");
    return true;
  }
}

class AuthGuard3 implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    throw new ForbiddenException("this is AuthGuard3 error");
    return false;
  }
}

@UseGuards(AuthGuard)
@Controller("/user")
export class UserController {
  @UseGuards(AuthGuard2, AuthGuard3)
  @Get("/info/:id")
  test(
    context: Context,
    @add() name: string,
    @Query() params: any,
    @Query("age") age: string,
  ) {
    console.log(params, age);
    context.response.body = "role info " + name + " - " +
      JSON.stringify(params);
  }

  @Get("/info")
  getInfo(@Res() res: Response, @Query() params: any) {
    console.log(params);
    res.body = "role get info " + JSON.stringify(params);
  }

  @Get("list")
  list(context: Context) {
    console.log("---list----");
    this.testInnerCall();
    context.response.body = "list";
  }

  testInnerCall() {
    console.log("---test---");
  }
}

You can customize the decorator by createParamDecorator or createParamDecoratorWithLowLevel:

const Add = createParamDecorator(async (ctx: any) => {
  const result = ctx.request.body(); // content type automatically detected
  if (result.type === "json") {
    const value = await result.value; // an object of parsed JSON
    // console.log('value', value);
    return value.userId;
  }
});

function Add2(params: any) {
  return createParamDecoratorWithLowLevel(async (ctx: any) => {
    return params;
  });
}

Then use like this:

@Post("/info")
info(
  @Add() name: string,
  @Add2("name") name2: string,
  @Body() params: any,
  @Headers() headers: any,
  @Headers("host") host: any,
  @Res() res: Response,
) {
  console.log("ctx", name, name2, params, headers, host);
  res.body = "role info " + name + name2;
}

You can also use class validator like this:

class Dto {
  @Max(2)
  @Min(1)
  pageNum!: number;

  @Max(5)
  @Min(1)
  pageCount!: number;
}

@Post("/info")
info(
  @Body() params: Dto
) {
  console.log("ctx", params);
  return "role info " + name;
}

The Body decorator is using deno_class_validator for validator, which is forked from class-validator which is using in nodejs, if it fails, then will throw an 400 Error.

Controller use Service

You can use Injectable to flag the service can be injectable, and it can be used by your Controller or other Service.

import { Injectable } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";

@Injectable()
export class RoleService {
  info() {
    return "info from RoleService";
  }
}

@Injectable()
export class UserService {
  constructor(
    private readonly roleService: RoleService,
  ) {}
  info() {
    return mockjs.mock({
      name: "@name",
      "age|1-100": 50,
      "val|0-2": 1,
      role: this.roleService.info(),
      user2: this.userService2.info(),
    });
  }
}

@Controller("user")
export class User2Controller {
  constructor(
    private readonly userService: UserService,
    private readonly roleService: RoleService,
  ) {
  }
  @Get("/user2")
  info(context: Context) {
    context.response.body = this.userService.info() + this.roleService.info();
  }
}

If you like to use the Service alone in anywhere, you can with Factory like this:

import { Factory } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
Factory(UserService).info();

router add Controller

import { UserController } from "./user.controller.ts";
import { User2Controller } from "./user2.controller.ts";
import { RoleController } from "./role.controller.ts";
import { Router } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";

const router = new Router();
await router.add(UserController);
router.setGlobalPrefix("api");
await router.add(RoleController, User2Controller);

It should be noted that router.add has been modified to asynchronous by me. Of course, I now recommend the following way use Module.

use router in app

import {
  Application,
  isHttpError,
  Router,
  send,
  Status,
} from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";

const app = new Application();

// Timing
app.use(async (ctx, next) => {
  const start = Date.now();
  await next();
  const ms = Date.now() - start;
  ctx.response.headers.set("X-Response-Time", `${ms}ms`);
});

const router = new Router();
app.use(router.routes());

const port = Number(Deno.env.get("PORT") || 1000);
console.log(`app will start with: http://localhost:${port}`);
await app.listen({ port });

now you can visit http://localhost:1000/api/user/info,http://localhost:1000/api/user/list.

use Module

First is the AppModule:

import { Module } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { AppController } from "./app.controller.ts";
import { UserModule } from "./user/user.module.ts";

@Module({
  imports: [
    UserModule,
  ],
  controllers: [AppController],
})
export class AppModule {}

Then is UserModule, and the providers can contain the services which are not used by controllers.

import { Module } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { RoleController } from "./controllers/role.controller.ts";
import { UserController } from "./controllers/user.controller.ts";
import { User2Controller } from "./controllers/user2.controller.ts";
import { ScheduleService } from "./services/schedule.service.ts";

@Module({
  imports: [],
  controllers: [
    UserController,
    RoleController,
    User2Controller,
  ],
  providers: [
    ScheduleService,
  ],
})
export class UserModule {
}

Then this is your main.ts:

import {
  Context,
  isHttpError,
  NestFactory,
  Status,
} from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { AppModule } from "./app.module.ts";

const app = await NestFactory.create(AppModule);
app.setGlobalPrefix("api");

// Timing
app.use(async (ctx: Context, next) => {
  const start = Date.now();
  await next();
  const ms = Date.now() - start;
  ctx.response.headers.set("X-Response-Time", `${ms}ms`);
});

app.get("/hello", (ctx: Context) => {
  ctx.response.body = "hello";
});

app.use(app.routes());

const port = Number(Deno.env.get("PORT") || 1000);
console.log(`app will start with: http://localhost:${port}`);
await app.listen({ port });

connect db

If you want to connect db such as Mongodb, you can do like this:

import { Module } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { AppController } from "./app.controller.ts";
import { UserModule } from "./user/user.module.ts";

@Module({
  imports: [
    MongoFactory.forRoot(globals.db), // it can return a Promise
    UserModule,
  ],
  controllers: [AppController],
})
export class AppModule {}

And you may provide a method to inject your Model:

export const InjectModel = (Cls: Constructor) =>
  (target: Constructor, _property: any, index: number) => {
    Reflect.defineMetadata("design:inject" + index, {
      params: [Cls],
      fn: getModel,
    }, target);
  };

The function getModel can return a new Model which will be used in Service. It maybe like this:

async function getModel<T>(
  cls: SchemaCls,
): Promise<Model<T>> {
  // do some else
  return new cls();
}

You can also use the Inject decorator to help you:

import { Inject } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
export const InjectModel = (Cls: Constructor) => Inject(() => getModel(Cls));

To support it, I changed the router.add method to asynchronous. It was not a pleasant decision.

Here is a Service example:

@Injectable()
export class UserService {
  constructor(@InjectModel(User) private readonly model: Model<User>) {
  }
  async save(createUserDto: AddUserDto): Promise<string> {
    console.log(this.model);
    const id = await this.model.insertOne(createUserDto);
    console.log(id);
    return id.toString();
  }
}

In the above code, this.model is the getModel result.

register Dynamic Module

You can also register a Dynamic Module like this:

import { DynamicModule } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { ASYNC_KEY } from "./async.constant.ts";
import { AsyncService } from "./async.service.ts";

export class AsyncModule {
  static register(db: string): DynamicModule {
    return {
      module: AsyncModule,
      providers: [{
        provide: ASYNC_KEY,
        useFactory: () => { // can be async
          console.log("AsyncModule.register: ", db);
          return Promise.resolve(true);
        },
      }, AsyncService],
    };
  }
}

And the AsyncService like this:

import { Inject, Injectable } from "https://deno.land/x/oak_nest@v1.0.1/mod.ts";
import { ASYNC_KEY } from "./async.constant.ts";

@Injectable()
export class AsyncService {
  constructor(@Inject(ASYNC_KEY) private readonly connection: string) {
    console.log(
      "injected CONNECTION_ASYNC maybe true: ",
      this.connection,
      "----",
      connection,
    );
  }

  info() {
    return "info from AsyncService and the conecction is: " + this.connection;
  }
}

The ASYNC_KEY recommended use symbol like this:

export const ASYNC_KEY = Symbol("CONNECTION_ASYNC");

Then the AsyncModule can be use by other modules and the service can be injected to other service.

@Module({
  imports: [
    UserModule,
    AsyncModule.register("localhost:4878"),
  ],
  controllers: [AppController],
})
export class AppModule {}

You can also see the RedisModule example this way or use the modules such as cache and scheduler in the modules dir.

TODO

unit test

You can see more in the example dirs.