preliminary queue implementation

package-lock.json

@@ -9,7 +9,9 @@
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+      "resolved": "https://registry.npmjs.org/ioredis/-/ioredis-4.28.5.tgz",
+      "integrity": "sha512-3GYo0GJtLqgNXj4YhrisLaNNvWSNwSS2wS4OELGfGxH8I69+XfNdnmV1AyN+ZqMh0i7eX+SWjrwFKDBDgfBC1A==",
+      "peer": true,
+      "requires": {
+        "cluster-key-slot": "^1.1.0",
+        "debug": "^4.3.1",
+        "denque": "^1.1.0",
+        "lodash.defaults": "^4.2.0",
+        "lodash.flatten": "^4.4.0",
+        "lodash.isarguments": "^3.1.0",
+        "p-map": "^2.1.0",
+        "redis-commands": "1.7.0",
+        "redis-errors": "^1.2.0",
+        "redis-parser": "^3.0.0",
+        "standard-as-callback": "^2.1.0"
+      }
+    },
     "ipaddr.js": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
@@ -13030,8 +13597,25 @@
     "lodash": {
       "version": "4.17.21",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
-      "dev": true
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+    },
+    "lodash.defaults": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/lodash.defaults/-/lodash.defaults-4.2.0.tgz",
+      "integrity": "sha512-qjxPLHd3r5DnsdGacqOMU6pb/avJzdh9tFX2ymgoZE27BmjXrNy/y4LoaiTeAb+O3gL8AfpJGtqfX/ae2leYYQ==",
+      "peer": true
+    },
+    "lodash.flatten": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/lodash.flatten/-/lodash.flatten-4.4.0.tgz",
+      "integrity": "sha512-C5N2Z3DgnnKr0LOpv/hKCgKdb7ZZwafIrsesve6lmzvZIRZRGaZ/l6Q8+2W7NaT+ZwO3fFlSCzCzrDCFdJfZ4g==",
+      "peer": true
+    },
+    "lodash.isarguments": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz",
+      "integrity": "sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg==",
+      "peer": true
     },
     "lodash.memoize": {
       "version": "4.1.2",
@@ -13071,11 +13655,16 @@
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
       "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
-      "dev": true,
       "requires": {
         "yallist": "^4.0.0"
       }
     },
+    "luxon": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/luxon/-/luxon-2.5.0.tgz",
+      "integrity": "sha512-IDkEPB80Rb6gCAU+FEib0t4FeJ4uVOuX1CQ9GsvU3O+JAGIgu0J7sf1OarXKaKDygTZIoJyU6YdZzTFRu+YR0A==",
+      "peer": true
+    },
     "macos-release": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/macos-release/-/macos-release-2.5.0.tgz",
@@ -13224,6 +13813,31 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
+    "msgpackr": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/msgpackr/-/msgpackr-1.6.1.tgz",
+      "integrity": "sha512-Je+xBEfdjtvA4bKaOv8iRhjC8qX2oJwpYH4f7JrG4uMVJVmnmkAT4pjKdbztKprGj3iwjcxPzb5umVZ02Qq3tA==",
+      "peer": true,
+      "requires": {
+        "msgpackr-extract": "^2.0.2"
+      }
+    },
+    "msgpackr-extract": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/msgpackr-extract/-/msgpackr-extract-2.0.2.tgz",
+      "integrity": "sha512-coskCeJG2KDny23zWeu+6tNy7BLnAiOGgiwzlgdm4oeSsTpqEJJPguHIuKZcCdB7tzhZbXNYSg6jZAXkZErkJA==",
+      "optional": true,
+      "peer": true,
+      "requires": {
+        "@msgpackr-extract/msgpackr-extract-darwin-arm64": "2.0.2",
+        "@msgpackr-extract/msgpackr-extract-darwin-x64": "2.0.2",
+        "@msgpackr-extract/msgpackr-extract-linux-arm": "2.0.2",
+        "@msgpackr-extract/msgpackr-extract-linux-arm64": "2.0.2",
+        "@msgpackr-extract/msgpackr-extract-linux-x64": "2.0.2",
+        "@msgpackr-extract/msgpackr-extract-win32-x64": "2.0.2",
+        "node-gyp-build-optional-packages": "5.0.2"
+      }
+    },
     "multer": {
       "version": "1.4.4-lts.1",
       "resolved": "https://registry.npmjs.org/multer/-/multer-1.4.4-lts.1.tgz",
@@ -13278,6 +13892,13 @@
         "whatwg-url": "^5.0.0"
       }
     },
+    "node-gyp-build-optional-packages": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/node-gyp-build-optional-packages/-/node-gyp-build-optional-packages-5.0.2.tgz",
+      "integrity": "sha512-PiN4NWmlQPqvbEFcH/omQsswWQbe5Z9YK/zdB23irp5j2XibaA2IrGvpSWmVVG4qMZdmPdwPctSy4a86rOMn6g==",
+      "optional": true,
+      "peer": true
+    },
     "node-int64": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -13404,6 +14025,12 @@
       "integrity": "sha512-D2FR03Vir7FIu45XBY20mTb+/ZSWB00sjU9jdQXt83gDrI4Ztz5Fs7/yy74g2N5SVQY4xY1qDr4rNddwYRVX0g==",
       "dev": true
     },
+    "p-finally": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
+      "integrity": "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow==",
+      "peer": true
+    },
     "p-limit": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
@@ -13420,6 +14047,21 @@
         "p-limit": "^2.2.0"
       }
     },
+    "p-map": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/p-map/-/p-map-2.1.0.tgz",
+      "integrity": "sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==",
+      "peer": true
+    },
+    "p-timeout": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-3.2.0.tgz",
+      "integrity": "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg==",
+      "peer": true,
+      "requires": {
+        "p-finally": "^1.0.0"
+      }
+    },
     "p-try": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
@@ -13737,6 +14379,27 @@
         "resolve": "^1.1.6"
       }
     },
+    "redis-commands": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/redis-commands/-/redis-commands-1.7.0.tgz",
+      "integrity": "sha512-nJWqw3bTFy21hX/CPKHth6sfhZbdiHP6bTawSgQBlKOVRG7EZkfHbbHwQJnrE4vsQf0CMNE+3gJ4Fmm16vdVlQ==",
+      "peer": true
+    },
+    "redis-errors": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/redis-errors/-/redis-errors-1.2.0.tgz",
+      "integrity": "sha512-1qny3OExCf0UvUV/5wpYKf2YwPcOqXzkwKKSmKHiE6ZMQs5heeE/c8eXK+PNllPvmjgAbfnsbpkGZWy8cBpn9w==",
+      "peer": true
+    },
+    "redis-parser": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/redis-parser/-/redis-parser-3.0.0.tgz",
+      "integrity": "sha512-DJnGAeenTdpMEH6uAJRK/uiyEIH9WVsUmoLwzudwGJUwZPp80PDBWPHXSAGNPwNvIXAbe7MSUB1zQFugFml66A==",
+      "peer": true,
+      "requires": {
+        "redis-errors": "^1.0.0"
+      }
+    },
     "reflect-metadata": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.1.13.tgz",
@@ -13899,7 +14562,6 @@
       "version": "7.3.7",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.7.tgz",
       "integrity": "sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==",
-      "dev": true,
       "requires": {
         "lru-cache": "^6.0.0"
       }
@@ -14084,6 +14746,12 @@
         }
       }
     },
+    "standard-as-callback": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/standard-as-callback/-/standard-as-callback-2.1.0.tgz",
+      "integrity": "sha512-qoRRSyROncaz1z0mvYqIE4lCd9p2R90i6GxW3uZv5ucSu8tU7B5HXUP1gG8pVZsYNVaXjk8ClXHPttLyxAL48A==",
+      "peer": true
+    },
     "statuses": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
@@ -14880,8 +15548,7 @@
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "dev": true
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yaml": {
       "version": "1.10.2",

package.json

@@ -21,7 +21,9 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
+    "@nestjs/bull": "^0.6.0",
     "@nestjs/common": "^9.0.0",
+    "@nestjs/config": "^2.2.0",
     "@nestjs/core": "^9.0.0",
     "@nestjs/platform-express": "^9.0.0",
     "puppeteer": "^15.3.2",
@@ -33,6 +35,7 @@
     "@nestjs/cli": "^9.0.0",
     "@nestjs/schematics": "^9.0.0",
     "@nestjs/testing": "^9.0.0",
+    "@types/bull": "^3.15.8",
     "@types/express": "^4.17.13",
     "@types/jest": "28.1.4",
     "@types/jest-image-snapshot": "^5.1.0",
@@ -68,7 +71,9 @@
     "collectCoverageFrom": [
       "**/*.(t|j)s"
     ],
-    "setupFilesAfterEnv": ["<rootDir>/setup.jest.ts"],
+    "setupFilesAfterEnv": [
+      "<rootDir>/setup.jest.ts"
+    ],
     "coverageDirectory": "../coverage",
     "testEnvironment": "node"
   }

src/app.module.ts

@@ -1,10 +1,22 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule, ConfigService } from '@nestjs/config';
 import { HelloWorldController } from './hello-world/controller';
 import { HelloWorldService } from './hello-world/service';
 import { ScreenshotterService } from './screenshotter/screenshotter.service';
+import { BullModule } from '@nestjs/bull';
+import { ScreenshotsModule } from './screenshots/screenshots.module';
+import { BullConfigService } from './bull/bullConfigService';
 
 @Module({
-  imports: [],
+  imports: [
+    ConfigModule.forRoot(),
+    BullModule.forRootAsync({
+      imports: [ConfigModule],
+      useClass: BullConfigService,
+      inject: [ConfigService],
+    }),
+    ScreenshotsModule,
+  ],
   controllers: [HelloWorldController],
   providers: [HelloWorldService, ScreenshotterService],
 })

src/bull/bullConfigService.ts

@@ -0,0 +1,18 @@
+import { BullModuleOptions, SharedBullConfigurationFactory } from "@nestjs/bull";
+import { Injectable } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
+
+@Injectable()
+export class BullConfigService implements SharedBullConfigurationFactory {
+  constructor(private readonly configService: ConfigService) {
+  }
+
+  createSharedConfiguration(): BullModuleOptions {
+    return {
+      redis: {
+        host: this.configService.getOrThrow('BULL_REDIS_HOST'),
+        port: parseInt(this.configService.getOrThrow('BULL_REDIS_PORT'), 10),
+      },
+    };
+  }
+}

src/screenshots/screenshots.controller.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { ScreenshotsController } from './screenshots.controller';
+
+describe('ScreenshotsController', () => {
+  let controller: ScreenshotsController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [ScreenshotsController],
+    }).compile();
+
+    controller = module.get<ScreenshotsController>(ScreenshotsController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/screenshots/screenshots.controller.ts

@@ -0,0 +1,54 @@
+import { InjectQueue } from '@nestjs/bull';
+import { Body, Controller, Get, NotFoundException, Param, Post } from '@nestjs/common';
+import { QUEUE_NAME, ScreenshotsQueue } from './shared';
+
+type CreateScreenshotJobDto = {
+  pageUrl: URL,
+  imageType: 'jpeg' | 'png'
+}
+
+@Controller('screenshots')
+export class ScreenshotsController {
+  constructor(@InjectQueue(QUEUE_NAME) private readonly screenshotsQueue: ScreenshotsQueue) {}
+
+  @Post()
+  async createScreenshotJob(@Body() createScreenshotJobDto: CreateScreenshotJobDto) {
+    const result = await this.screenshotsQueue.add(createScreenshotJobDto)
+    return {
+      jobId: result.id.toString()
+    }
+  }
+
+  @Get(':id')
+  async getJob(@Param('id') id: string) {
+    const jobInfo = await this.screenshotsQueue.getJob(id)
+
+    if (!jobInfo) {
+      throw new NotFoundException()
+    }
+
+    switch (await jobInfo.getState()) {
+      case 'completed':
+        return { status: 'completed' }
+      case 'failed':
+        return { status: 'failed' }
+      default:
+        return { status: 'queued' }
+    }
+  }
+
+  @Get(':id/result')
+  async getScreenshot(@Param('id') id: string) {
+    const jobInfo = await this.screenshotsQueue.getJob(id)
+
+    if (!jobInfo) {
+      throw new NotFoundException()
+    }
+
+    if (!await jobInfo.isCompleted()) {
+      throw new NotFoundException()
+    }
+
+    return await jobInfo.returnvalue
+  }
+}

src/screenshots/screenshots.module.ts

@@ -0,0 +1,16 @@
+import { BullModule } from '@nestjs/bull';
+import { Module } from '@nestjs/common';
+import { QUEUE_NAME } from './shared';
+import { ScreenshotsController } from './screenshots.controller';
+import { ScreenshotsProcessor } from './screenshots.processor';
+
+@Module({
+  imports: [
+    BullModule.registerQueue({
+      name: QUEUE_NAME,
+    }),
+  ],
+  controllers: [ScreenshotsController],
+  providers: [ScreenshotsProcessor]
+})
+export class ScreenshotsModule {}

src/screenshots/screenshots.processor.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { ScreenshotsProcessor } from './screenshots.processor';
+
+describe('ScreenshotsProcessor', () => {
+  let service: ScreenshotsProcessor;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [ScreenshotsProcessor],
+    }).compile();
+
+    service = module.get<ScreenshotsProcessor>(ScreenshotsProcessor);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/screenshots/screenshots.processor.ts

@@ -0,0 +1,12 @@
+import { Process, Processor } from '@nestjs/bull';
+import { Injectable } from '@nestjs/common';
+import { QUEUE_NAME, ScreenshotJob } from './shared';
+
+@Injectable()
+@Processor(QUEUE_NAME)
+export class ScreenshotsProcessor {
+  @Process()
+  async handleScreenshotJob(job: ScreenshotJob) {
+    job.moveToCompleted('abc')
+  }
+}

src/screenshots/shared.ts

@@ -0,0 +1,12 @@
+import { Job, Queue } from "bull"
+
+export const QUEUE_NAME = 'screenshots'
+
+export type ScreenshotJobData = {
+  pageUrl: URL
+  imageType: 'jpeg' | 'png'
+}
+
+export type ScreenshotJob = Job<ScreenshotJobData>
+
+export type ScreenshotsQueue = Queue<ScreenshotJobData>