Refactored UPS monitor as clusterio plugin (#398)

* Refactor server ups

* Use catalogs

* Move to own plugin

* Use web config

* Remove External.get_server_ups

* Update workspace version requirement

* Remove need for storage

* Add locale

* Fix CI

exp_server_ups/instance.ts

@@ -0,0 +1,48 @@
+import * as lib from "@clusterio/lib";
+import { BaseInstancePlugin } from "@clusterio/host";
+
+export class InstancePlugin extends BaseInstancePlugin {
+	private updateInterval?: ReturnType<typeof setInterval>;
+	private gameTimes: number[] = [];
+
+	async onStart() {
+		this.updateInterval = setInterval(this.updateUps.bind(this), this.instance.config.get("exp_server_ups.update_interval"));
+	}
+
+	async onStop() {
+		if (this.updateInterval) {
+			clearInterval(this.updateInterval);
+		}
+	}
+
+	async onInstanceConfigFieldChanged(field: string, curr: unknown): Promise<void> {
+		if (field === "exp_server_ups.update_interval") {
+			await this.onStop();
+			await this.onStart();
+		} else if (field === "exp_server_ups.average_interval") {
+			this.gameTimes.splice(curr as number);
+		}
+	}
+
+	async updateUps() {
+		let ups = 0;
+		const collected = this.gameTimes.length - 1;
+		if (collected > 0) {
+			const minTick = this.gameTimes[0];
+			const maxTick = this.gameTimes[collected];
+			const interval = this.instance.config.get("exp_server_ups.update_interval") / 1000;
+			ups = (maxTick - minTick) / (collected * interval);
+		}
+
+		try {
+			const newGameTime = await this.sendRcon(`/_rcon return exp_server_ups.update(${ups})`);
+			this.gameTimes.push(Number(newGameTime));
+		} catch (error: any) {
+			this.logger.error(`Failed to receive new game time: ${error}`);
+		}
+
+		if (collected > this.instance.config.get("exp_server_ups.average_interval")) {
+			this.gameTimes.shift();
+		}
+	}
+}