recator placement of code

backend/prodSql/prodSqlConnection.controller.ts

@@ -0,0 +1,157 @@
+import sql from "mssql";
+import { prodSqlConfig } from "../configs/prodSql.config.js";
+import { createLogger } from "../logger/logger.controller.js";
+import { checkHostnamePort } from "../utils/checkHost.utils.js";
+import { returnFunc } from "../utils/returnHelper.utils.js";
+
+export let pool: sql.ConnectionPool;
+export let connected: boolean = false;
+export let reconnecting = false;
+
+export const connectProdSql = async () => {
+	const serverUp = await checkHostnamePort(`${process.env.PROD_SERVER}:1433`);
+	if (!serverUp) {
+		// we will try to reconnect
+		connected = false;
+		return returnFunc({
+			success: false,
+			level: "error",
+			module: "system",
+			subModule: "db",
+			message: "Prod server is offline or unreachable.",
+		});
+	}
+
+	// if we are trying to click restart from the api for some reason we want to kick back and say no
+	if (connected) {
+		return returnFunc({
+			success: false,
+			level: "error",
+			module: "system",
+			subModule: "db",
+			message: "The Sql server is already connected.",
+		});
+	}
+
+	// try to connect to the sql server
+	try {
+		pool = new sql.ConnectionPool(prodSqlConfig);
+		await pool.connect();
+		connected = true;
+		return returnFunc({
+			success: true,
+			level: "info",
+			module: "system",
+			subModule: "db",
+			message: `${prodSqlConfig.server} is connected to ${prodSqlConfig.database}`,
+			data: [],
+			notify: false,
+		});
+	} catch (error) {
+		return returnFunc({
+			success: false,
+			level: "error",
+			module: "system",
+			subModule: "db",
+			message: "Failed to connect to the prod sql server.",
+			data: [error],
+			notify: false,
+		});
+	}
+};
+
+export const closePool = async () => {
+	if (!connected) {
+		return returnFunc({
+			success: false,
+			level: "error",
+			module: "system",
+			subModule: "db",
+			message: "There is no connection to the prod server currently.",
+		});
+	}
+
+	try {
+		await pool.close();
+		connected = false;
+		return returnFunc({
+			success: true,
+			level: "info",
+			module: "system",
+			subModule: "db",
+			message: "The sql connection has been closed.",
+		});
+	} catch (error) {
+		connected = false;
+
+		return returnFunc({
+			success: false,
+			level: "error",
+			module: "system",
+			subModule: "db",
+			message: "There was an error closing the sql connection",
+			data: [error],
+		});
+	}
+};
+export const reconnectToSql = async () => {
+	const log = createLogger({
+		module: "system",
+		subModule: "db",
+	});
+	if (reconnecting) return;
+
+	//set reconnecting to true while we try to reconnect
+	reconnecting = true;
+
+	// start the delay out as 2 seconds
+	let delayStart = 2000;
+	let attempt = 0;
+	const maxAttempts = 10;
+
+	while (!connected && attempt < maxAttempts) {
+		attempt++;
+		log.info(
+			`Reconnect attempt ${attempt}/${maxAttempts} in ${delayStart / 1000}s ...`,
+		);
+
+		await new Promise((res) => setTimeout(res, delayStart));
+
+		const serverUp = await checkHostnamePort(`${process.env.PROD_SERVER}:1433`);
+
+		if (!serverUp) {
+			delayStart = Math.min(delayStart * 2, 30000); // exponential backoff until up to 30000
+			return;
+		}
+
+		try {
+			pool = await sql.connect(prodSqlConfig);
+			reconnecting = false;
+			connected = true;
+			log.info(
+				`${prodSqlConfig.server} is connected to ${prodSqlConfig.database}`,
+			);
+		} catch (error) {
+			delayStart = Math.min(delayStart * 2, 30000);
+			return returnFunc({
+				success: false,
+				level: "error",
+				module: "system",
+				subModule: "db",
+				message: "Failed to reconnect to the prod sql server.",
+				data: [error],
+				notify: false,
+			});
+		}
+	}
+
+	if (!connected) {
+		log.error(
+			{ notify: true },
+			"Max reconnect attempts reached on the prodSql server. Stopping retries.",
+		);
+
+		reconnecting = false;
+		// TODO: exit alert someone here
+	}
+};