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backend service structure, config, DB connection

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Inga 🏳‍🌈 5 days ago
parent 54648bd617
commit 81da0f2766
11 changed files with 493 additions and 15 deletions
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  1. 4
      service/.eslintrc.js
  2. 393
      service/package-lock.json
  3. 6
      service/package.json
  4. 17
      service/src/app.controller.spec.ts
  5. 2
      service/src/app.controller.ts
  6. 17
      service/src/app.module.ts
  7. 12
      service/src/app.service.ts
  8. 32
      service/src/db/index.ts
  9. 2
      service/src/main.ts
  10. 13
      service/src/utils/nestjsHelpers.ts
  11. 10
      service/test/app.e2e-spec.ts

4
service/.eslintrc.js
Unescape View File

@ -18,5 +18,7 @@ module.exports = {
jest: true,
},
ignorePatterns: ['.eslintrc.js'],
rules: {},
rules: {
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},
};

393
service/package-lock.json generated
Unescape View File

@ -10,8 +10,13 @@
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"node_modules/postgres-interval": {
"version": "1.2.0",
"resolved": "https://registry.npmjs.org/postgres-interval/-/postgres-interval-1.2.0.tgz",
"integrity": "sha512-9ZhXKM/rw350N1ovuWHbGxnGh/SNJ4cnxHiM0rxE4VN41wsg8P8zWn9hv/buK00RP4WvlOyr/RBDiptyxVbkZQ==",
"license": "MIT",
"dependencies": {
"xtend": "^4.0.0"
},
"engines": {
"node": ">=0.10.0"
}
},
"node_modules/postgres-range": {
"version": "1.1.4",
"resolved": "https://registry.npmjs.org/postgres-range/-/postgres-range-1.1.4.tgz",
"integrity": "sha512-i/hbxIE9803Alj/6ytL7UHQxRvZkI9O4Sy+J3HGc4F4oo/2eQAjTSNJ0bfxyse3bH0nuVesCk+3IRLaMtG3H6w==",
"dev": true,
"license": "MIT"
},
"node_modules/prelude-ls": {
"version": "1.2.1",
"resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@ -8071,6 +8431,15 @@
"node": ">=0.10.0"
}
},
"node_modules/split2": {
"version": "4.2.0",
"resolved": "https://registry.npmjs.org/split2/-/split2-4.2.0.tgz",
"integrity": "sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==",
"license": "ISC",
"engines": {
"node": ">= 10.x"
}
},
"node_modules/sprintf-js": {
"version": "1.0.3",
"resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@ -8311,6 +8680,15 @@
"url": "https://github.com/sponsors/ljharb"
}
},
"node_modules/swagger-ui-dist": {
"version": "5.18.2",
"resolved": "https://registry.npmjs.org/swagger-ui-dist/-/swagger-ui-dist-5.18.2.tgz",
"integrity": "sha512-J+y4mCw/zXh1FOj5wGJvnAajq6XgHOyywsa9yITmwxIlJbMqITq3gYRZHaeqLVH/eV/HOPphE6NjF+nbSNC5Zw==",
"license": "Apache-2.0",
"dependencies": {
"@scarf/scarf": "=1.4.0"
}
},
"node_modules/symbol-observable": {
"version": "4.0.0",
"resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-4.0.0.tgz",
@ -8952,6 +9330,15 @@
"node": ">=10.12.0"
}
},
"node_modules/validator": {
"version": "13.12.0",
"resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
"integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
"license": "MIT",
"engines": {
"node": ">= 0.10"
}
},
"node_modules/vary": {
"version": "1.1.2",
"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",

6
service/package.json
Unescape View File

@ -21,8 +21,13 @@
},
"dependencies": {
"@nestjs/common": "^10.0.0",
"@nestjs/config": "^3.3.0",
"@nestjs/core": "^10.0.0",
"@nestjs/platform-express": "^10.0.0",
"@nestjs/swagger": "^8.1.1",
"class-transformer": "^0.5.1",
"class-validator": "^0.14.1",
"pg": "^8.13.1",
"reflect-metadata": "^0.2.0",
"rxjs": "^7.8.1"
},
@ -34,6 +39,7 @@
"@types/express": "^5.0.0",
"@types/jest": "^29.5.2",
"@types/node": "^20.3.1",
"@types/pg": "^8.11.10",
"@types/supertest": "^6.0.0",
"@typescript-eslint/eslint-plugin": "^8.0.0",
"@typescript-eslint/parser": "^8.0.0",

17
service/src/app.controller.spec.ts
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@ -1,6 +1,7 @@
import { Test, TestingModule } from '@nestjs/testing';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { DbClient } from './db';
describe('AppController', () => {
let appController: AppController;
@ -8,15 +9,25 @@ describe('AppController', () => {
beforeEach(async () => {
const app: TestingModule = await Test.createTestingModule({
controllers: [AppController],
providers: [AppService],
providers: [
{
provide: 'dbClient',
useValue: {
getNumberOfAllSlots: () => Promise.resolve(123),
} satisfies DbClient,
},
AppService,
],
}).compile();
appController = app.get<AppController>(AppController);
});
describe('root', () => {
it('should return "Hello World!"', () => {
expect(appController.getHello()).toBe('Hello World!');
it('should return "Hello World!"', async () => {
await expect(appController.getHello()).resolves.toBe(
'Hello World! There are 123 total slots.',
);
});
});
});

2
service/src/app.controller.ts
Unescape View File

@ -6,7 +6,7 @@ export class AppController {
constructor(private readonly appService: AppService) {}
@Get()
getHello(): string {
async getHello(): Promise<string> {
return this.appService.getHello();
}
}

17
service/src/app.module.ts
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@ -1,11 +1,24 @@
import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { createDbClient } from './db';
@Module({
imports: [],
imports: [ConfigModule.forRoot({ ignoreEnvFile: true })],
controllers: [AppController],
providers: [AppService],
providers: [
{
provide: 'dbClient',
useFactory: (configService: ConfigService) =>
createDbClient(
configService.get('PG_CONNECTION_STRING') ??
'postgres://postgres:mypassword123!@localhost:5432/coding-challenge',
),
inject: [ConfigService],
},
AppService,
],
})
// eslint-disable-next-line @typescript-eslint/no-extraneous-class
export class AppModule {}

12
service/src/app.service.ts
Unescape View File

@ -1,8 +1,14 @@
import { Injectable } from '@nestjs/common';
import { Inject, Injectable } from '@nestjs/common';
import { DbClient } from './db';
@Injectable()
export class AppService {
getHello(): string {
return 'Hello World!';
constructor(
@Inject('dbClient')
private readonly dbClient: DbClient,
) {}
async getHello(): Promise<string> {
return `Hello World! There are ${await this.dbClient.getNumberOfAllSlots()} total slots.`;
}
}

32
service/src/db/index.ts
Unescape View File

@ -0,0 +1,32 @@
import { OnModuleDestroy } from '@nestjs/common';
import { Pool } from 'pg';
export interface DbClient {
getNumberOfAllSlots(): Promise<number>;
}
export const createDbClient = async (
connectionString: string,
): Promise<DbClient & OnModuleDestroy> => {
const pool = new Pool({ connectionString });
{
// Checking DB connectivity
const connection = await pool.connect();
connection.release();
}
return {
getNumberOfAllSlots: async () => {
const result = await pool.query<{ count: string }>({
text: 'select count(*) as count from slots',
});
return parseInt(result.rows[0]?.count ?? '0');
},
onModuleDestroy: async () => {
await pool.end();
},
};
};

2
service/src/main.ts
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@ -1,8 +1,10 @@
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { configureApp } from './utils/nestjsHelpers';
async function bootstrap() {
const app = await NestFactory.create(AppModule);
configureApp(app);
await app.listen(process.env['PORT'] ?? 3000);
}
void bootstrap();

13
service/src/utils/nestjsHelpers.ts
Unescape View File

@ -0,0 +1,13 @@
import { type INestApplication, ValidationPipe } from '@nestjs/common';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
export const configureApp = (app: INestApplication<unknown>) => {
app.useGlobalPipes(new ValidationPipe({ transform: true }));
const config = new DocumentBuilder()
.setTitle('Test joyn assignment')
.setVersion('1.0')
.build();
const document = SwaggerModule.createDocument(app, config);
SwaggerModule.setup('api', app, document);
};

10
service/test/app.e2e-spec.ts
Unescape View File

@ -2,7 +2,8 @@ import { Test, TestingModule } from '@nestjs/testing';
import { INestApplication } from '@nestjs/common';
import request from 'supertest';
import type { App } from 'supertest/types';
import { AppModule } from './../src/app.module';
import { AppModule } from '../src/app.module';
import { configureApp } from '../src/utils/nestjsHelpers';
describe('AppController (e2e)', () => {
let app: INestApplication<App>;
@ -13,13 +14,18 @@ describe('AppController (e2e)', () => {
}).compile();
app = moduleFixture.createNestApplication<INestApplication<App>>();
configureApp(app);
await app.init();
});
afterEach(async () => {
await app.close();
});
it('/ (GET)', () => {
return request(app.getHttpServer())
.get('/')
.expect(200)
.expect('Hello World!');
.expect('Hello World! There are 18 total slots.');
});
});

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