Add retried fetch and connection check

plugin/src/utils/retried-fetch.ts

@@ -0,0 +1,41 @@
+import * as fetchRetryFactory from "fetch-retry";
+import { Logger } from "src/tracing/logger";
+
+const fetchWithRetry = fetchRetryFactory.default(fetch);
+
+export async function retriedFetch(
+	input: RequestInfo | URL,
+	init: RequestInit = {}
+): Promise<Response> {
+	return fetchWithRetry(input, {
+		...init,
+		retryOn: function (attempt, error, response) {
+			// retry on any network error, or 4xx or 5xx status codes
+			if (error !== null || !response || response.status >= 500) {
+				Logger.getInstance().warn(
+					`Retrying fetch attempt ${attempt} for ${getUrlFromInput(
+						input
+					)}`
+				);
+
+				return true;
+			}
+			return false;
+		},
+		retries: 6,
+		retryDelay: function (attempt) {
+			Logger;
+			return Math.pow(1.5, attempt) * 500;
+		},
+	});
+}
+
+function getUrlFromInput(input: RequestInfo | URL): string {
+	if (input instanceof URL) {
+		return input.href;
+	}
+	if (typeof input === "string") {
+		return input;
+	}
+	return input.url;
+}