enhance(backend): improve chart engine

packages/backend/src/services/chart/charts/per-user-drive.ts

@@ -0,0 +1,68 @@
+import autobind from 'autobind-decorator';
+import Chart, { Obj, DeepPartial } from '../core';
+import { SchemaType } from '@/misc/schema';
+import { DriveFiles } from '@/models/index';
+import { DriveFile } from '@/models/entities/drive-file';
+import { name, schema } from './entities/per-user-drive';
+
+type PerUserDriveLog = SchemaType<typeof schema>;
+
+/**
+ * ユーザーごとのドライブに関するチャート
+ */
+// eslint-disable-next-line import/no-default-export
+export default class PerUserDriveChart extends Chart<PerUserDriveLog> {
+	constructor() {
+		super(name, schema, true);
+	}
+
+	@autobind
+	protected genNewLog(latest: PerUserDriveLog): DeepPartial<PerUserDriveLog> {
+		return {
+			totalCount: latest.totalCount,
+			totalSize: latest.totalSize,
+		};
+	}
+
+	@autobind
+	protected aggregate(logs: PerUserDriveLog[]): PerUserDriveLog {
+		return {
+			totalCount: logs[0].totalCount,
+			totalSize: logs[0].totalSize,
+			incCount: logs.reduce((a, b) => a + b.incCount, 0),
+			incSize: logs.reduce((a, b) => a + b.incSize, 0),
+			decCount: logs.reduce((a, b) => a + b.decCount, 0),
+			decSize: logs.reduce((a, b) => a + b.decSize, 0),
+		};
+	}
+
+	@autobind
+	protected async fetchActual(group: string): Promise<DeepPartial<PerUserDriveLog>> {
+		const [count, size] = await Promise.all([
+			DriveFiles.count({ userId: group }),
+			DriveFiles.calcDriveUsageOf(group),
+		]);
+
+		return {
+			totalCount: count,
+			totalSize: size,
+		};
+	}
+
+	@autobind
+	public async update(file: DriveFile, isAdditional: boolean): Promise<void> {
+		const update: Obj = {};
+
+		update.totalCount = isAdditional ? 1 : -1;
+		update.totalSize = isAdditional ? file.size : -file.size;
+		if (isAdditional) {
+			update.incCount = 1;
+			update.incSize = file.size;
+		} else {
+			update.decCount = 1;
+			update.decSize = file.size;
+		}
+
+		await this.inc(update, file.userId);
+	}
+}