Add REST rate limit logging (#814)

extensions/copilot/src/platform/github/common/githubAPI.ts

@@ -0,0 +1,44 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ILogService } from '../../log/common/logService';
+import { IFetcherService } from '../../networking/common/fetcherService';
+import { ITelemetryService } from '../../telemetry/common/telemetry';
+
+
+export async function makeGitHubAPIRequest(fetcherService: IFetcherService, logService: ILogService, telemetry: ITelemetryService, host: string, routeSlug: string, method: 'GET' | 'POST', token: string | undefined, body?: { [key: string]: any }) {
+	const headers: any = {
+		'Accept': 'application/vnd.github+json',
+		'X-GitHub-Api-Version': '2022-11-28'
+	};
+	if (token) {
+		headers['Authorization'] = `Bearer ${token}`;
+	}
+
+	const response = await fetcherService.fetch(`${host}/${routeSlug}`, {
+		method,
+		headers,
+		body: body ? JSON.stringify(body) : undefined
+	});
+	if (!response.ok) {
+		return undefined;
+	}
+
+	try {
+		const result = await response.json();
+		const rateLimit = Number(response.headers.get('x-ratelimit-remaining'));
+		const logMessage = `[RateLimit] REST rate limit remaining: ${rateLimit}, ${routeSlug}`;
+		if (rateLimit < 1000) {
+			// Danger zone
+			logService.warn(logMessage);
+			telemetry.sendMSFTTelemetryEvent('githubAPI.approachingRateLimit', { rateLimit: rateLimit.toString() });
+		} else {
+			logService.debug(logMessage);
+		}
+		return result;
+	} catch {
+		return undefined;
+	}
+}