Implement #2993

src/chart/federation.ts

@@ -0,0 +1,65 @@
+import autobind from 'autobind-decorator';
+import Chart, { Obj } from '.';
+
+/**
+ * フェデレーションに関するチャート
+ */
+type FederationLog = {
+	instance: {
+		/**
+		 * インスタンス数の合計
+		 */
+		total: number;
+
+		/**
+		 * 増加インスタンス数
+		 */
+		inc: number;
+
+		/**
+		 * 減少インスタンス数
+		 */
+		dec: number;
+	};
+};
+
+class FederationChart extends Chart<FederationLog> {
+	constructor() {
+		super('federation');
+	}
+
+	@autobind
+	protected async getTemplate(init: boolean, latest?: FederationLog): Promise<FederationLog> {
+		const [total] = init ? await Promise.all([
+			Instance.count({})
+		]) : [
+			latest ? latest.instance.total : 0
+		];
+
+		return {
+			instance: {
+				total: total,
+				inc: 0,
+				dec: 0
+			}
+		};
+	}
+
+	@autobind
+	public async update(isAdditional: boolean) {
+		const update: Obj = {};
+
+		update.total = isAdditional ? 1 : -1;
+		if (isAdditional) {
+			update.inc = 1;
+		} else {
+			update.dec = 1;
+		}
+
+		await this.inc({
+			instance: update
+		});
+	}
+}
+
+export default new FederationChart();