add scheduled event handler for running cron jobs (#6)

* add scheduled event handler for running cron jobs

* schedule cron jobs to run every 4 hours

* add strict type checking

src/config/config.ts

@@ -0,0 +1,15 @@
+import { env } from '../types/global.types';
+
+export const handleConfig = (env: env) => {
+	let baseUrl: string;
+	if (env.CURRENT_ENVIRONMENT) {
+		if (env.CURRENT_ENVIRONMENT.toLowerCase() === 'production') {
+			baseUrl = 'https://api.realdevsquad.com';
+		} else {
+			baseUrl = 'https://staging-api.realdevsquad.com';
+		}
+	} else {
+		baseUrl = 'https://staging-api.realdevsquad.com';
+	}
+	return { baseUrl };
+};

src/handlers/scheduledEventHandler.ts

@@ -0,0 +1,8 @@
+import { handleConfig } from '../config/config';
+import { env } from '../types/global.types';
+
+export async function ping(env: env) {
+	const url = handleConfig(env);
+	const response = await fetch(`${url.baseUrl}/healthcheck`);
+	return response;
+}

src/worker.ts

@@ -1,9 +1,17 @@
+import { ping } from './handlers/scheduledEventHandler';
 import { env } from './types/global.types';
 
 export default {
-	// ToDo: remove the eslint disabled after proper implementation
+	// We need to keep all 3 parameters in this format even if they are not used as as cloudflare workers need them to be present So we are disabling eslint rule of no-unused-vars
+	// for more details read here: https://community.cloudflare.com/t/waituntil-is-not-a-function-when-using-workers-with-modules/375781/4
 	// eslint-disable-next-line no-unused-vars
-	async fetch(request: Request, env: env, ctx: ExecutionContext): Promise<Response> {
+	async scheduled(req: Request, env: env, ctx: ExecutionContext) {
+		ctx.waitUntil(ping(env));
+	},
+	// We need to keep all 3 parameters in this format even if they are not used as as cloudflare workers need them to be present So we are disabling eslint rule of no-unused-vars
+	// for more details read here: https://community.cloudflare.com/t/waituntil-is-not-a-function-when-using-workers-with-modules/375781/4
+	// eslint-disable-next-line no-unused-vars
+	async fetch(req: Request, env: env, ctx: ExecutionContext): Promise<Response> {
 		return new Response('Hello World!');
 	},
 };

wrangler.toml

@@ -1,6 +1,8 @@
 name = "cron-jobs"
 main = "src/worker.ts"
 compatibility_date = "2023-07-17"
+[triggers]
+crons = ["0 */4 * * *"]
 
 # # KV Namespace binding - For more information: https://developers.cloudflare.com/workers/runtime-apis/kv
 # [[kv_namespaces]]