Add webp thumbnail conversion task to optimize performance of fast scrolling (#172)

* Update readme

* Added webp to table and entity

* Added cronjob and sharp dependencies

* Added conversion of webp every 5 minutes and endpoint will now server webp image if exist

server/src/modules/schedule-tasks/image-conversion.service.ts

@@ -0,0 +1,52 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Cron, CronExpression } from '@nestjs/schedule';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { AssetEntity } from '../../api-v1/asset/entities/asset.entity';
+import sharp from 'sharp';
+
+@Injectable()
+export class ImageConversionService {
+
+  constructor(
+    @InjectRepository(AssetEntity)
+    private assetRepository: Repository<AssetEntity>
+  ) { }
+
+  @Cron(CronExpression.EVERY_5_MINUTES
+    , {
+      name: 'webp-conversion'
+    })
+  async webpConversion() {
+    Logger.log('Starting Webp Conversion Tasks', 'ImageConversionService')
+
+    const assets = await this.assetRepository.find({
+      where: {
+        webpPath: ''
+      },
+      take: 500
+    });
+
+
+    if (assets.length == 0) {
+      Logger.log('All assets has webp file - aborting task', 'ImageConversionService')
+      return;
+    }
+
+
+    for (const asset of assets) {
+      const resizePath = asset.resizePath;
+      if (resizePath != '') {
+        const webpPath = resizePath.replace('jpeg', 'webp')
+
+        sharp(resizePath).resize(250).webp().toFile(webpPath, (err, info) => {
+
+          if (!err) {
+            this.assetRepository.update({ id: asset.id }, { webpPath: webpPath })
+          }
+
+        });
+      }
+    }
+  }
+}

server/src/modules/schedule-tasks/schedule-tasks.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { AssetEntity } from '../../api-v1/asset/entities/asset.entity';
+import { ImageConversionService } from './image-conversion.service';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([AssetEntity]),
+  ],
+  providers: [ImageConversionService],
+})
+export class ScheduleTasksModule { }