enhance(backend): improve chart engine

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

@@ -0,0 +1,48 @@
+import autobind from 'autobind-decorator';
+import Chart, { DeepPartial } from '../core';
+import { User } from '@/models/entities/user';
+import { Note } from '@/models/entities/note';
+import { SchemaType } from '@/misc/schema';
+import { Users } from '@/models/index';
+import { name, schema } from './entities/per-user-reactions';
+
+type PerUserReactionsLog = SchemaType<typeof schema>;
+
+/**
+ * ユーザーごとのリアクションに関するチャート
+ */
+// eslint-disable-next-line import/no-default-export
+export default class PerUserReactionsChart extends Chart<PerUserReactionsLog> {
+	constructor() {
+		super(name, schema, true);
+	}
+
+	@autobind
+	protected genNewLog(latest: PerUserReactionsLog): DeepPartial<PerUserReactionsLog> {
+		return {};
+	}
+
+	@autobind
+	protected aggregate(logs: PerUserReactionsLog[]): PerUserReactionsLog {
+		return {
+			local: {
+				count: logs.reduce((a, b) => a + b.local.count, 0),
+			},
+			remote: {
+				count: logs.reduce((a, b) => a + b.remote.count, 0),
+			},
+		};
+	}
+
+	@autobind
+	protected async fetchActual(group: string): Promise<DeepPartial<PerUserReactionsLog>> {
+		return {};
+	}
+
+	@autobind
+	public async update(user: { id: User['id'], host: User['host'] }, note: Note): Promise<void> {
+		this.inc({
+			[Users.isLocalUser(user) ? 'local' : 'remote']: { count: 1 },
+		}, note.userId);
+	}
+}